1 /*
   2  * Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "classfile/vmSymbols.hpp"
  27 #ifndef SERIALGC
  28 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"
  29 #endif // SERIALGC
  30 #include "memory/allocation.inline.hpp"
  31 #include "prims/jni.h"
  32 #include "prims/jvm.h"
  33 #include "runtime/globals.hpp"
  34 #include "runtime/interfaceSupport.hpp"
  35 #include "runtime/reflection.hpp"
  36 #include "runtime/synchronizer.hpp"
  37 #include "services/threadService.hpp"
  38 #include "utilities/copy.hpp"
  39 #include "utilities/dtrace.hpp"
  40 
  41 /*
  42  *      Implementation of class sun.misc.Unsafe
  43  */
  44 
  45 HS_DTRACE_PROBE_DECL3(hotspot, thread__park__begin, uintptr_t, int, long long);
  46 HS_DTRACE_PROBE_DECL1(hotspot, thread__park__end, uintptr_t);
  47 HS_DTRACE_PROBE_DECL1(hotspot, thread__unpark, uintptr_t);
  48 
  49 #define MAX_OBJECT_SIZE \
  50   ( arrayOopDesc::header_size(T_DOUBLE) * HeapWordSize \
  51     + ((julong)max_jint * sizeof(double)) )
  52 
  53 
  54 #define UNSAFE_ENTRY(result_type, header) \
  55   JVM_ENTRY(result_type, header)
  56 
  57 // Can't use UNSAFE_LEAF because it has the signature of a straight
  58 // call into the runtime (just like JVM_LEAF, funny that) but it's
  59 // called like a Java Native and thus the wrapper built for it passes
  60 // arguments like a JNI call.  It expects those arguments to be popped
  61 // from the stack on Intel like all good JNI args are, and adjusts the
  62 // stack according.  Since the JVM_LEAF call expects no extra
  63 // arguments the stack isn't popped in the C code, is pushed by the
  64 // wrapper and we get sick.
  65 //#define UNSAFE_LEAF(result_type, header) \
  66 //  JVM_LEAF(result_type, header)
  67 
  68 #define UNSAFE_END JVM_END
  69 
  70 #define UnsafeWrapper(arg) /*nothing, for the present*/
  71 
  72 
  73 inline void* addr_from_java(jlong addr) {
  74   // This assert fails in a variety of ways on 32-bit systems.
  75   // It is impossible to predict whether native code that converts
  76   // pointers to longs will sign-extend or zero-extend the addresses.
  77   //assert(addr == (uintptr_t)addr, "must not be odd high bits");
  78   return (void*)(uintptr_t)addr;
  79 }
  80 
  81 inline jlong addr_to_java(void* p) {
  82   assert(p == (void*)(uintptr_t)p, "must not be odd high bits");
  83   return (uintptr_t)p;
  84 }
  85 
  86 
  87 // Note: The VM's obj_field and related accessors use byte-scaled
  88 // ("unscaled") offsets, just as the unsafe methods do.
  89 
  90 // However, the method Unsafe.fieldOffset explicitly declines to
  91 // guarantee this.  The field offset values manipulated by the Java user
  92 // through the Unsafe API are opaque cookies that just happen to be byte
  93 // offsets.  We represent this state of affairs by passing the cookies
  94 // through conversion functions when going between the VM and the Unsafe API.
  95 // The conversion functions just happen to be no-ops at present.
  96 
  97 inline jlong field_offset_to_byte_offset(jlong field_offset) {
  98   return field_offset;
  99 }
 100 
 101 inline jlong field_offset_from_byte_offset(jlong byte_offset) {
 102   return byte_offset;
 103 }
 104 
 105 inline jint invocation_key_from_method_slot(jint slot) {
 106   return slot;
 107 }
 108 
 109 inline jint invocation_key_to_method_slot(jint key) {
 110   return key;
 111 }
 112 
 113 inline void* index_oop_from_field_offset_long(oop p, jlong field_offset) {
 114   jlong byte_offset = field_offset_to_byte_offset(field_offset);
 115   // Don't allow unsafe to be used to read or write the header word of oops
 116   assert(p == NULL || field_offset >= oopDesc::header_size(), "offset must be outside of header");
 117 #ifdef ASSERT
 118   if (p != NULL) {
 119     assert(byte_offset >= 0 && byte_offset <= (jlong)MAX_OBJECT_SIZE, "sane offset");
 120     if (byte_offset == (jint)byte_offset) {
 121       void* ptr_plus_disp = (address)p + byte_offset;
 122       assert((void*)p->obj_field_addr<oop>((jint)byte_offset) == ptr_plus_disp,
 123              "raw [ptr+disp] must be consistent with oop::field_base");
 124     }
 125   }
 126 #endif
 127   if (sizeof(char*) == sizeof(jint))    // (this constant folds!)
 128     return (address)p + (jint) byte_offset;
 129   else
 130     return (address)p +        byte_offset;
 131 }
 132 
 133 // Externally callable versions:
 134 // (Use these in compiler intrinsics which emulate unsafe primitives.)
 135 jlong Unsafe_field_offset_to_byte_offset(jlong field_offset) {
 136   return field_offset;
 137 }
 138 jlong Unsafe_field_offset_from_byte_offset(jlong byte_offset) {
 139   return byte_offset;
 140 }
 141 jint Unsafe_invocation_key_from_method_slot(jint slot) {
 142   return invocation_key_from_method_slot(slot);
 143 }
 144 jint Unsafe_invocation_key_to_method_slot(jint key) {
 145   return invocation_key_to_method_slot(key);
 146 }
 147 
 148 
 149 ///// Data in the Java heap.
 150 
 151 #define GET_FIELD(obj, offset, type_name, v) \
 152   oop p = JNIHandles::resolve(obj); \
 153   type_name v = *(type_name*)index_oop_from_field_offset_long(p, offset)
 154 
 155 #define SET_FIELD(obj, offset, type_name, x) \
 156   oop p = JNIHandles::resolve(obj); \
 157   *(type_name*)index_oop_from_field_offset_long(p, offset) = x
 158 
 159 #define GET_FIELD_VOLATILE(obj, offset, type_name, v) \
 160   oop p = JNIHandles::resolve(obj); \
 161   volatile type_name v = OrderAccess::load_acquire((volatile type_name*)index_oop_from_field_offset_long(p, offset));
 162 
 163 #define SET_FIELD_VOLATILE(obj, offset, type_name, x) \
 164   oop p = JNIHandles::resolve(obj); \
 165   OrderAccess::release_store_fence((volatile type_name*)index_oop_from_field_offset_long(p, offset), x);
 166 
 167 // Macros for oops that check UseCompressedOops
 168 
 169 #define GET_OOP_FIELD(obj, offset, v) \
 170   oop p = JNIHandles::resolve(obj);   \
 171   oop v;                              \
 172   if (UseCompressedOops) {            \
 173     narrowOop n = *(narrowOop*)index_oop_from_field_offset_long(p, offset); \
 174     v = oopDesc::decode_heap_oop(n);                                \
 175   } else {                            \
 176     v = *(oop*)index_oop_from_field_offset_long(p, offset);                 \
 177   }
 178 
 179 #define GET_OOP_FIELD_VOLATILE(obj, offset, v) \
 180   oop p = JNIHandles::resolve(obj);   \
 181   volatile oop v;                     \
 182   if (UseCompressedOops) {            \
 183     volatile narrowOop n = *(volatile narrowOop*)index_oop_from_field_offset_long(p, offset); \
 184     v = oopDesc::decode_heap_oop(n);                               \
 185   } else {                            \
 186     v = *(volatile oop*)index_oop_from_field_offset_long(p, offset);       \
 187   } \
 188   OrderAccess::acquire();
 189 
 190 
 191 // Get/SetObject must be special-cased, since it works with handles.
 192 
 193 // The xxx140 variants for backward compatibility do not allow a full-width offset.
 194 UNSAFE_ENTRY(jobject, Unsafe_GetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset))
 195   UnsafeWrapper("Unsafe_GetObject");
 196   if (obj == NULL)  THROW_0(vmSymbols::java_lang_NullPointerException());
 197   GET_OOP_FIELD(obj, offset, v)
 198   jobject ret = JNIHandles::make_local(env, v);
 199 #ifndef SERIALGC
 200   // We could be accessing the referent field in a reference
 201   // object. If G1 is enabled then we need to register a non-null
 202   // referent with the SATB barrier.
 203   if (UseG1GC) {
 204     bool needs_barrier = false;
 205 
 206     if (ret != NULL) {
 207       if (offset == java_lang_ref_Reference::referent_offset) {
 208         oop o = JNIHandles::resolve_non_null(obj);
 209         klassOop k = o->klass();
 210         if (instanceKlass::cast(k)->reference_type() != REF_NONE) {
 211           assert(instanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity");
 212           needs_barrier = true;
 213         }
 214       }
 215     }
 216 
 217     if (needs_barrier) {
 218       oop referent = JNIHandles::resolve(ret);
 219       G1SATBCardTableModRefBS::enqueue(referent);
 220     }
 221   }
 222 #endif // SERIALGC
 223   return ret;
 224 UNSAFE_END
 225 
 226 UNSAFE_ENTRY(void, Unsafe_SetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jobject x_h))
 227   UnsafeWrapper("Unsafe_SetObject");
 228   if (obj == NULL)  THROW(vmSymbols::java_lang_NullPointerException());
 229   oop x = JNIHandles::resolve(x_h);
 230   //SET_FIELD(obj, offset, oop, x);
 231   oop p = JNIHandles::resolve(obj);
 232   if (UseCompressedOops) {
 233     if (x != NULL) {
 234       // If there is a heap base pointer, we are obliged to emit a store barrier.
 235       oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
 236     } else {
 237       narrowOop n = oopDesc::encode_heap_oop_not_null(x);
 238       *(narrowOop*)index_oop_from_field_offset_long(p, offset) = n;
 239     }
 240   } else {
 241     if (x != NULL) {
 242       // If there is a heap base pointer, we are obliged to emit a store barrier.
 243       oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
 244     } else {
 245       *(oop*)index_oop_from_field_offset_long(p, offset) = x;
 246     }
 247   }
 248 UNSAFE_END
 249 
 250 // The normal variants allow a null base pointer with an arbitrary address.
 251 // But if the base pointer is non-null, the offset should make some sense.
 252 // That is, it should be in the range [0, MAX_OBJECT_SIZE].
 253 UNSAFE_ENTRY(jobject, Unsafe_GetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
 254   UnsafeWrapper("Unsafe_GetObject");
 255   GET_OOP_FIELD(obj, offset, v)
 256   jobject ret = JNIHandles::make_local(env, v);
 257 #ifndef SERIALGC
 258   // We could be accessing the referent field in a reference
 259   // object. If G1 is enabled then we need to register non-null
 260   // referent with the SATB barrier.
 261   if (UseG1GC) {
 262     bool needs_barrier = false;
 263 
 264     if (ret != NULL) {
 265       if (offset == java_lang_ref_Reference::referent_offset && obj != NULL) {
 266         oop o = JNIHandles::resolve(obj);
 267         klassOop k = o->klass();
 268         if (instanceKlass::cast(k)->reference_type() != REF_NONE) {
 269           assert(instanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity");
 270           needs_barrier = true;
 271         }
 272       }
 273     }
 274 
 275     if (needs_barrier) {
 276       oop referent = JNIHandles::resolve(ret);
 277       G1SATBCardTableModRefBS::enqueue(referent);
 278     }
 279   }
 280 #endif // SERIALGC
 281   return ret;
 282 UNSAFE_END
 283 
 284 UNSAFE_ENTRY(void, Unsafe_SetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
 285   UnsafeWrapper("Unsafe_SetObject");
 286   oop x = JNIHandles::resolve(x_h);
 287   oop p = JNIHandles::resolve(obj);
 288   if (UseCompressedOops) {
 289     oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
 290   } else {
 291     oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
 292   }
 293 UNSAFE_END
 294 
 295 UNSAFE_ENTRY(jobject, Unsafe_GetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
 296   UnsafeWrapper("Unsafe_GetObjectVolatile");
 297   GET_OOP_FIELD_VOLATILE(obj, offset, v)
 298   return JNIHandles::make_local(env, v);
 299 UNSAFE_END
 300 
 301 UNSAFE_ENTRY(void, Unsafe_SetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
 302   UnsafeWrapper("Unsafe_SetObjectVolatile");
 303   oop x = JNIHandles::resolve(x_h);
 304   oop p = JNIHandles::resolve(obj);
 305   // Catch VolatileCallSite.target stores (via
 306   // CallSite.setTargetVolatile) and check call site dependencies.
 307   if ((offset == java_lang_invoke_CallSite::target_offset_in_bytes()) && p->is_a(SystemDictionary::CallSite_klass())) {
 308     oop call_site     = p;
 309     oop method_handle = x;
 310     assert(call_site    ->is_a(SystemDictionary::CallSite_klass()),     "must be");
 311     assert(method_handle->is_a(SystemDictionary::MethodHandle_klass()), "must be");
 312     {
 313       // Walk all nmethods depending on this call site.
 314       MutexLocker mu(Compile_lock, thread);
 315       Universe::flush_dependents_on(call_site, method_handle);
 316     }
 317   }
 318   void* addr = index_oop_from_field_offset_long(p, offset);
 319   OrderAccess::release();
 320   if (UseCompressedOops) {
 321     oop_store((narrowOop*)addr, x);
 322   } else {
 323     oop_store((oop*)addr, x);
 324   }
 325   OrderAccess::fence();
 326 UNSAFE_END
 327 
 328 #if defined(SPARC) || defined(X86)
 329 // Sparc and X86 have atomic jlong (8 bytes) instructions
 330 
 331 #else
 332 // Keep old code for platforms which may not have atomic jlong (8 bytes) instructions
 333 
 334 // Volatile long versions must use locks if !VM_Version::supports_cx8().
 335 // support_cx8 is a surrogate for 'supports atomic long memory ops'.
 336 
 337 UNSAFE_ENTRY(jlong, Unsafe_GetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
 338   UnsafeWrapper("Unsafe_GetLongVolatile");
 339   {
 340     if (VM_Version::supports_cx8()) {
 341       GET_FIELD_VOLATILE(obj, offset, jlong, v);
 342       return v;
 343     }
 344     else {
 345       Handle p (THREAD, JNIHandles::resolve(obj));
 346       jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
 347       ObjectLocker ol(p, THREAD);
 348       jlong value = *addr;
 349       return value;
 350     }
 351   }
 352 UNSAFE_END
 353 
 354 UNSAFE_ENTRY(void, Unsafe_SetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
 355   UnsafeWrapper("Unsafe_SetLongVolatile");
 356   {
 357     if (VM_Version::supports_cx8()) {
 358       SET_FIELD_VOLATILE(obj, offset, jlong, x);
 359     }
 360     else {
 361       Handle p (THREAD, JNIHandles::resolve(obj));
 362       jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
 363       ObjectLocker ol(p, THREAD);
 364       *addr = x;
 365     }
 366   }
 367 UNSAFE_END
 368 
 369 #endif // not SPARC and not X86
 370 
 371 #define DEFINE_GETSETOOP(jboolean, Boolean) \
 372  \
 373 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset)) \
 374   UnsafeWrapper("Unsafe_Get"#Boolean); \
 375   if (obj == NULL)  THROW_0(vmSymbols::java_lang_NullPointerException()); \
 376   GET_FIELD(obj, offset, jboolean, v); \
 377   return v; \
 378 UNSAFE_END \
 379  \
 380 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jboolean x)) \
 381   UnsafeWrapper("Unsafe_Set"#Boolean); \
 382   if (obj == NULL)  THROW(vmSymbols::java_lang_NullPointerException()); \
 383   SET_FIELD(obj, offset, jboolean, x); \
 384 UNSAFE_END \
 385  \
 386 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
 387   UnsafeWrapper("Unsafe_Get"#Boolean); \
 388   GET_FIELD(obj, offset, jboolean, v); \
 389   return v; \
 390 UNSAFE_END \
 391  \
 392 UNSAFE_ENTRY(void, Unsafe_Set##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
 393   UnsafeWrapper("Unsafe_Set"#Boolean); \
 394   SET_FIELD(obj, offset, jboolean, x); \
 395 UNSAFE_END \
 396  \
 397 // END DEFINE_GETSETOOP.
 398 
 399 DEFINE_GETSETOOP(jboolean, Boolean)
 400 DEFINE_GETSETOOP(jbyte, Byte)
 401 DEFINE_GETSETOOP(jshort, Short);
 402 DEFINE_GETSETOOP(jchar, Char);
 403 DEFINE_GETSETOOP(jint, Int);
 404 DEFINE_GETSETOOP(jlong, Long);
 405 DEFINE_GETSETOOP(jfloat, Float);
 406 DEFINE_GETSETOOP(jdouble, Double);
 407 
 408 #undef DEFINE_GETSETOOP
 409 
 410 #define DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean) \
 411  \
 412 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
 413   UnsafeWrapper("Unsafe_Get"#Boolean); \
 414   GET_FIELD_VOLATILE(obj, offset, jboolean, v); \
 415   return v; \
 416 UNSAFE_END \
 417  \
 418 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
 419   UnsafeWrapper("Unsafe_Set"#Boolean); \
 420   SET_FIELD_VOLATILE(obj, offset, jboolean, x); \
 421 UNSAFE_END \
 422  \
 423 // END DEFINE_GETSETOOP_VOLATILE.
 424 
 425 DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean)
 426 DEFINE_GETSETOOP_VOLATILE(jbyte, Byte)
 427 DEFINE_GETSETOOP_VOLATILE(jshort, Short);
 428 DEFINE_GETSETOOP_VOLATILE(jchar, Char);
 429 DEFINE_GETSETOOP_VOLATILE(jint, Int);
 430 DEFINE_GETSETOOP_VOLATILE(jfloat, Float);
 431 DEFINE_GETSETOOP_VOLATILE(jdouble, Double);
 432 
 433 #if defined(SPARC) || defined(X86)
 434 // Sparc and X86 have atomic jlong (8 bytes) instructions
 435 DEFINE_GETSETOOP_VOLATILE(jlong, Long);
 436 #endif
 437 
 438 #undef DEFINE_GETSETOOP_VOLATILE
 439 
 440 // The non-intrinsified versions of setOrdered just use setVolatile
 441 
 442 UNSAFE_ENTRY(void, Unsafe_SetOrderedInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint x))
 443   UnsafeWrapper("Unsafe_SetOrderedInt");
 444   SET_FIELD_VOLATILE(obj, offset, jint, x);
 445 UNSAFE_END
 446 
 447 UNSAFE_ENTRY(void, Unsafe_SetOrderedObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
 448   UnsafeWrapper("Unsafe_SetOrderedObject");
 449   oop x = JNIHandles::resolve(x_h);
 450   oop p = JNIHandles::resolve(obj);
 451   void* addr = index_oop_from_field_offset_long(p, offset);
 452   OrderAccess::release();
 453   if (UseCompressedOops) {
 454     oop_store((narrowOop*)addr, x);
 455   } else {
 456     oop_store((oop*)addr, x);
 457   }
 458   OrderAccess::fence();
 459 UNSAFE_END
 460 
 461 UNSAFE_ENTRY(void, Unsafe_SetOrderedLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
 462   UnsafeWrapper("Unsafe_SetOrderedLong");
 463 #if defined(SPARC) || defined(X86)
 464   // Sparc and X86 have atomic jlong (8 bytes) instructions
 465   SET_FIELD_VOLATILE(obj, offset, jlong, x);
 466 #else
 467   // Keep old code for platforms which may not have atomic long (8 bytes) instructions
 468   {
 469     if (VM_Version::supports_cx8()) {
 470       SET_FIELD_VOLATILE(obj, offset, jlong, x);
 471     }
 472     else {
 473       Handle p (THREAD, JNIHandles::resolve(obj));
 474       jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
 475       ObjectLocker ol(p, THREAD);
 476       *addr = x;
 477     }
 478   }
 479 #endif
 480 UNSAFE_END
 481 
 482 ////// Data in the C heap.
 483 
 484 // Note:  These do not throw NullPointerException for bad pointers.
 485 // They just crash.  Only a oop base pointer can generate a NullPointerException.
 486 //
 487 #define DEFINE_GETSETNATIVE(java_type, Type, native_type) \
 488  \
 489 UNSAFE_ENTRY(java_type, Unsafe_GetNative##Type(JNIEnv *env, jobject unsafe, jlong addr)) \
 490   UnsafeWrapper("Unsafe_GetNative"#Type); \
 491   void* p = addr_from_java(addr); \
 492   JavaThread* t = JavaThread::current(); \
 493   t->set_doing_unsafe_access(true); \
 494   java_type x = *(volatile native_type*)p; \
 495   t->set_doing_unsafe_access(false); \
 496   return x; \
 497 UNSAFE_END \
 498  \
 499 UNSAFE_ENTRY(void, Unsafe_SetNative##Type(JNIEnv *env, jobject unsafe, jlong addr, java_type x)) \
 500   UnsafeWrapper("Unsafe_SetNative"#Type); \
 501   JavaThread* t = JavaThread::current(); \
 502   t->set_doing_unsafe_access(true); \
 503   void* p = addr_from_java(addr); \
 504   *(volatile native_type*)p = x; \
 505   t->set_doing_unsafe_access(false); \
 506 UNSAFE_END \
 507  \
 508 // END DEFINE_GETSETNATIVE.
 509 
 510 DEFINE_GETSETNATIVE(jbyte, Byte, signed char)
 511 DEFINE_GETSETNATIVE(jshort, Short, signed short);
 512 DEFINE_GETSETNATIVE(jchar, Char, unsigned short);
 513 DEFINE_GETSETNATIVE(jint, Int, jint);
 514 // no long -- handled specially
 515 DEFINE_GETSETNATIVE(jfloat, Float, float);
 516 DEFINE_GETSETNATIVE(jdouble, Double, double);
 517 
 518 #undef DEFINE_GETSETNATIVE
 519 
 520 UNSAFE_ENTRY(jlong, Unsafe_GetNativeLong(JNIEnv *env, jobject unsafe, jlong addr))
 521   UnsafeWrapper("Unsafe_GetNativeLong");
 522   JavaThread* t = JavaThread::current();
 523   // We do it this way to avoid problems with access to heap using 64
 524   // bit loads, as jlong in heap could be not 64-bit aligned, and on
 525   // some CPUs (SPARC) it leads to SIGBUS.
 526   t->set_doing_unsafe_access(true);
 527   void* p = addr_from_java(addr);
 528   jlong x;
 529   if (((intptr_t)p & 7) == 0) {
 530     // jlong is aligned, do a volatile access
 531     x = *(volatile jlong*)p;
 532   } else {
 533     jlong_accessor acc;
 534     acc.words[0] = ((volatile jint*)p)[0];
 535     acc.words[1] = ((volatile jint*)p)[1];
 536     x = acc.long_value;
 537   }
 538   t->set_doing_unsafe_access(false);
 539   return x;
 540 UNSAFE_END
 541 
 542 UNSAFE_ENTRY(void, Unsafe_SetNativeLong(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
 543   UnsafeWrapper("Unsafe_SetNativeLong");
 544   JavaThread* t = JavaThread::current();
 545   // see comment for Unsafe_GetNativeLong
 546   t->set_doing_unsafe_access(true);
 547   void* p = addr_from_java(addr);
 548   if (((intptr_t)p & 7) == 0) {
 549     // jlong is aligned, do a volatile access
 550     *(volatile jlong*)p = x;
 551   } else {
 552     jlong_accessor acc;
 553     acc.long_value = x;
 554     ((volatile jint*)p)[0] = acc.words[0];
 555     ((volatile jint*)p)[1] = acc.words[1];
 556   }
 557   t->set_doing_unsafe_access(false);
 558 UNSAFE_END
 559 
 560 
 561 UNSAFE_ENTRY(jlong, Unsafe_GetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr))
 562   UnsafeWrapper("Unsafe_GetNativeAddress");
 563   void* p = addr_from_java(addr);
 564   return addr_to_java(*(void**)p);
 565 UNSAFE_END
 566 
 567 UNSAFE_ENTRY(void, Unsafe_SetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
 568   UnsafeWrapper("Unsafe_SetNativeAddress");
 569   void* p = addr_from_java(addr);
 570   *(void**)p = addr_from_java(x);
 571 UNSAFE_END
 572 
 573 
 574 ////// Allocation requests
 575 
 576 UNSAFE_ENTRY(jobject, Unsafe_AllocateInstance(JNIEnv *env, jobject unsafe, jclass cls))
 577   UnsafeWrapper("Unsafe_AllocateInstance");
 578   {
 579     ThreadToNativeFromVM ttnfv(thread);
 580     return env->AllocObject(cls);
 581   }
 582 UNSAFE_END
 583 
 584 UNSAFE_ENTRY(jlong, Unsafe_AllocateMemory(JNIEnv *env, jobject unsafe, jlong size))
 585   UnsafeWrapper("Unsafe_AllocateMemory");
 586   size_t sz = (size_t)size;
 587   if (sz != (julong)size || size < 0) {
 588     THROW_0(vmSymbols::java_lang_IllegalArgumentException());
 589   }
 590   if (sz == 0) {
 591     return 0;
 592   }
 593   sz = round_to(sz, HeapWordSize);
 594   void* x = os::malloc(sz);
 595   if (x == NULL) {
 596     THROW_0(vmSymbols::java_lang_OutOfMemoryError());
 597   }
 598   //Copy::fill_to_words((HeapWord*)x, sz / HeapWordSize);
 599   return addr_to_java(x);
 600 UNSAFE_END
 601 
 602 UNSAFE_ENTRY(jlong, Unsafe_ReallocateMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size))
 603   UnsafeWrapper("Unsafe_ReallocateMemory");
 604   void* p = addr_from_java(addr);
 605   size_t sz = (size_t)size;
 606   if (sz != (julong)size || size < 0) {
 607     THROW_0(vmSymbols::java_lang_IllegalArgumentException());
 608   }
 609   if (sz == 0) {
 610     os::free(p);
 611     return 0;
 612   }
 613   sz = round_to(sz, HeapWordSize);
 614   void* x = (p == NULL) ? os::malloc(sz) : os::realloc(p, sz);
 615   if (x == NULL) {
 616     THROW_0(vmSymbols::java_lang_OutOfMemoryError());
 617   }
 618   return addr_to_java(x);
 619 UNSAFE_END
 620 
 621 UNSAFE_ENTRY(void, Unsafe_FreeMemory(JNIEnv *env, jobject unsafe, jlong addr))
 622   UnsafeWrapper("Unsafe_FreeMemory");
 623   void* p = addr_from_java(addr);
 624   if (p == NULL) {
 625     return;
 626   }
 627   os::free(p);
 628 UNSAFE_END
 629 
 630 UNSAFE_ENTRY(void, Unsafe_SetMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size, jbyte value))
 631   UnsafeWrapper("Unsafe_SetMemory");
 632   size_t sz = (size_t)size;
 633   if (sz != (julong)size || size < 0) {
 634     THROW(vmSymbols::java_lang_IllegalArgumentException());
 635   }
 636   char* p = (char*) addr_from_java(addr);
 637   Copy::fill_to_memory_atomic(p, sz, value);
 638 UNSAFE_END
 639 
 640 UNSAFE_ENTRY(void, Unsafe_SetMemory2(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong size, jbyte value))
 641   UnsafeWrapper("Unsafe_SetMemory");
 642   size_t sz = (size_t)size;
 643   if (sz != (julong)size || size < 0) {
 644     THROW(vmSymbols::java_lang_IllegalArgumentException());
 645   }
 646   oop base = JNIHandles::resolve(obj);
 647   void* p = index_oop_from_field_offset_long(base, offset);
 648   Copy::fill_to_memory_atomic(p, sz, value);
 649 UNSAFE_END
 650 
 651 UNSAFE_ENTRY(void, Unsafe_CopyMemory(JNIEnv *env, jobject unsafe, jlong srcAddr, jlong dstAddr, jlong size))
 652   UnsafeWrapper("Unsafe_CopyMemory");
 653   if (size == 0) {
 654     return;
 655   }
 656   size_t sz = (size_t)size;
 657   if (sz != (julong)size || size < 0) {
 658     THROW(vmSymbols::java_lang_IllegalArgumentException());
 659   }
 660   void* src = addr_from_java(srcAddr);
 661   void* dst = addr_from_java(dstAddr);
 662   Copy::conjoint_memory_atomic(src, dst, sz);
 663 UNSAFE_END
 664 
 665 UNSAFE_ENTRY(void, Unsafe_CopyMemory2(JNIEnv *env, jobject unsafe, jobject srcObj, jlong srcOffset, jobject dstObj, jlong dstOffset, jlong size))
 666   UnsafeWrapper("Unsafe_CopyMemory");
 667   if (size == 0) {
 668     return;
 669   }
 670   size_t sz = (size_t)size;
 671   if (sz != (julong)size || size < 0) {
 672     THROW(vmSymbols::java_lang_IllegalArgumentException());
 673   }
 674   oop srcp = JNIHandles::resolve(srcObj);
 675   oop dstp = JNIHandles::resolve(dstObj);
 676   if (dstp != NULL && !dstp->is_typeArray()) {
 677     // NYI:  This works only for non-oop arrays at present.
 678     // Generalizing it would be reasonable, but requires card marking.
 679     // Also, autoboxing a Long from 0L in copyMemory(x,y, 0L,z, n) would be bad.
 680     THROW(vmSymbols::java_lang_IllegalArgumentException());
 681   }
 682   void* src = index_oop_from_field_offset_long(srcp, srcOffset);
 683   void* dst = index_oop_from_field_offset_long(dstp, dstOffset);
 684   Copy::conjoint_memory_atomic(src, dst, sz);
 685 UNSAFE_END
 686 
 687 
 688 ////// Random queries
 689 
 690 // See comment at file start about UNSAFE_LEAF
 691 //UNSAFE_LEAF(jint, Unsafe_AddressSize())
 692 UNSAFE_ENTRY(jint, Unsafe_AddressSize(JNIEnv *env, jobject unsafe))
 693   UnsafeWrapper("Unsafe_AddressSize");
 694   return sizeof(void*);
 695 UNSAFE_END
 696 
 697 // See comment at file start about UNSAFE_LEAF
 698 //UNSAFE_LEAF(jint, Unsafe_PageSize())
 699 UNSAFE_ENTRY(jint, Unsafe_PageSize(JNIEnv *env, jobject unsafe))
 700   UnsafeWrapper("Unsafe_PageSize");
 701   return os::vm_page_size();
 702 UNSAFE_END
 703 
 704 jint find_field_offset(jobject field, int must_be_static, TRAPS) {
 705   if (field == NULL) {
 706     THROW_0(vmSymbols::java_lang_NullPointerException());
 707   }
 708 
 709   oop reflected   = JNIHandles::resolve_non_null(field);
 710   oop mirror      = java_lang_reflect_Field::clazz(reflected);
 711   klassOop k      = java_lang_Class::as_klassOop(mirror);
 712   int slot        = java_lang_reflect_Field::slot(reflected);
 713   int modifiers   = java_lang_reflect_Field::modifiers(reflected);
 714 
 715   if (must_be_static >= 0) {
 716     int really_is_static = ((modifiers & JVM_ACC_STATIC) != 0);
 717     if (must_be_static != really_is_static) {
 718       THROW_0(vmSymbols::java_lang_IllegalArgumentException());
 719     }
 720   }
 721 
 722   int offset = instanceKlass::cast(k)->field_offset(slot);
 723   return field_offset_from_byte_offset(offset);
 724 }
 725 
 726 UNSAFE_ENTRY(jlong, Unsafe_ObjectFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
 727   UnsafeWrapper("Unsafe_ObjectFieldOffset");
 728   return find_field_offset(field, 0, THREAD);
 729 UNSAFE_END
 730 
 731 UNSAFE_ENTRY(jlong, Unsafe_StaticFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
 732   UnsafeWrapper("Unsafe_StaticFieldOffset");
 733   return find_field_offset(field, 1, THREAD);
 734 UNSAFE_END
 735 
 736 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromField(JNIEnv *env, jobject unsafe, jobject field))
 737   UnsafeWrapper("Unsafe_StaticFieldBase");
 738   // Note:  In this VM implementation, a field address is always a short
 739   // offset from the base of a a klass metaobject.  Thus, the full dynamic
 740   // range of the return type is never used.  However, some implementations
 741   // might put the static field inside an array shared by many classes,
 742   // or even at a fixed address, in which case the address could be quite
 743   // large.  In that last case, this function would return NULL, since
 744   // the address would operate alone, without any base pointer.
 745 
 746   if (field == NULL)  THROW_0(vmSymbols::java_lang_NullPointerException());
 747 
 748   oop reflected   = JNIHandles::resolve_non_null(field);
 749   oop mirror      = java_lang_reflect_Field::clazz(reflected);
 750   int modifiers   = java_lang_reflect_Field::modifiers(reflected);
 751 
 752   if ((modifiers & JVM_ACC_STATIC) == 0) {
 753     THROW_0(vmSymbols::java_lang_IllegalArgumentException());
 754   }
 755 
 756   return JNIHandles::make_local(env, mirror);
 757 UNSAFE_END
 758 
 759 //@deprecated
 760 UNSAFE_ENTRY(jint, Unsafe_FieldOffset(JNIEnv *env, jobject unsafe, jobject field))
 761   UnsafeWrapper("Unsafe_FieldOffset");
 762   // tries (but fails) to be polymorphic between static and non-static:
 763   jlong offset = find_field_offset(field, -1, THREAD);
 764   guarantee(offset == (jint)offset, "offset fits in 32 bits");
 765   return (jint)offset;
 766 UNSAFE_END
 767 
 768 //@deprecated
 769 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromClass(JNIEnv *env, jobject unsafe, jobject clazz))
 770   UnsafeWrapper("Unsafe_StaticFieldBase");
 771   if (clazz == NULL) {
 772     THROW_0(vmSymbols::java_lang_NullPointerException());
 773   }
 774   return JNIHandles::make_local(env, JNIHandles::resolve_non_null(clazz));
 775 UNSAFE_END
 776 
 777 UNSAFE_ENTRY(void, Unsafe_EnsureClassInitialized(JNIEnv *env, jobject unsafe, jobject clazz))
 778   UnsafeWrapper("Unsafe_EnsureClassInitialized");
 779   if (clazz == NULL) {
 780     THROW(vmSymbols::java_lang_NullPointerException());
 781   }
 782   oop mirror = JNIHandles::resolve_non_null(clazz);
 783   instanceKlass* k = instanceKlass::cast(java_lang_Class::as_klassOop(mirror));
 784   if (k != NULL) {
 785     k->initialize(CHECK);
 786   }
 787 UNSAFE_END
 788 
 789 static void getBaseAndScale(int& base, int& scale, jclass acls, TRAPS) {
 790   if (acls == NULL) {
 791     THROW(vmSymbols::java_lang_NullPointerException());
 792   }
 793   oop      mirror = JNIHandles::resolve_non_null(acls);
 794   klassOop k      = java_lang_Class::as_klassOop(mirror);
 795   if (k == NULL || !k->klass_part()->oop_is_array()) {
 796     THROW(vmSymbols::java_lang_InvalidClassException());
 797   } else if (k->klass_part()->oop_is_objArray()) {
 798     base  = arrayOopDesc::base_offset_in_bytes(T_OBJECT);
 799     scale = heapOopSize;
 800   } else if (k->klass_part()->oop_is_typeArray()) {
 801     typeArrayKlass* tak = typeArrayKlass::cast(k);
 802     base  = tak->array_header_in_bytes();
 803     assert(base == arrayOopDesc::base_offset_in_bytes(tak->element_type()), "array_header_size semantics ok");
 804     scale = (1 << tak->log2_element_size());
 805   } else {
 806     ShouldNotReachHere();
 807   }
 808 }
 809 
 810 UNSAFE_ENTRY(jint, Unsafe_ArrayBaseOffset(JNIEnv *env, jobject unsafe, jclass acls))
 811   UnsafeWrapper("Unsafe_ArrayBaseOffset");
 812   int base, scale;
 813   getBaseAndScale(base, scale, acls, CHECK_0);
 814   return field_offset_from_byte_offset(base);
 815 UNSAFE_END
 816 
 817 
 818 UNSAFE_ENTRY(jint, Unsafe_ArrayIndexScale(JNIEnv *env, jobject unsafe, jclass acls))
 819   UnsafeWrapper("Unsafe_ArrayIndexScale");
 820   int base, scale;
 821   getBaseAndScale(base, scale, acls, CHECK_0);
 822   // This VM packs both fields and array elements down to the byte.
 823   // But watch out:  If this changes, so that array references for
 824   // a given primitive type (say, T_BOOLEAN) use different memory units
 825   // than fields, this method MUST return zero for such arrays.
 826   // For example, the VM used to store sub-word sized fields in full
 827   // words in the object layout, so that accessors like getByte(Object,int)
 828   // did not really do what one might expect for arrays.  Therefore,
 829   // this function used to report a zero scale factor, so that the user
 830   // would know not to attempt to access sub-word array elements.
 831   // // Code for unpacked fields:
 832   // if (scale < wordSize)  return 0;
 833 
 834   // The following allows for a pretty general fieldOffset cookie scheme,
 835   // but requires it to be linear in byte offset.
 836   return field_offset_from_byte_offset(scale) - field_offset_from_byte_offset(0);
 837 UNSAFE_END
 838 
 839 
 840 static inline void throw_new(JNIEnv *env, const char *ename) {
 841   char buf[100];
 842   strcpy(buf, "java/lang/");
 843   strcat(buf, ename);
 844   jclass cls = env->FindClass(buf);
 845   char* msg = NULL;
 846   env->ThrowNew(cls, msg);
 847 }
 848 
 849 static jclass Unsafe_DefineClass(JNIEnv *env, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd) {
 850   {
 851     // Code lifted from JDK 1.3 ClassLoader.c
 852 
 853     jbyte *body;
 854     char *utfName;
 855     jclass result = 0;
 856     char buf[128];
 857 
 858     if (UsePerfData) {
 859       ClassLoader::unsafe_defineClassCallCounter()->inc();
 860     }
 861 
 862     if (data == NULL) {
 863         throw_new(env, "NullPointerException");
 864         return 0;
 865     }
 866 
 867     /* Work around 4153825. malloc crashes on Solaris when passed a
 868      * negative size.
 869      */
 870     if (length < 0) {
 871         throw_new(env, "ArrayIndexOutOfBoundsException");
 872         return 0;
 873     }
 874 
 875     body = NEW_C_HEAP_ARRAY(jbyte, length);
 876 
 877     if (body == 0) {
 878         throw_new(env, "OutOfMemoryError");
 879         return 0;
 880     }
 881 
 882     env->GetByteArrayRegion(data, offset, length, body);
 883 
 884     if (env->ExceptionOccurred())
 885         goto free_body;
 886 
 887     if (name != NULL) {
 888         uint len = env->GetStringUTFLength(name);
 889         int unicode_len = env->GetStringLength(name);
 890         if (len >= sizeof(buf)) {
 891             utfName = NEW_C_HEAP_ARRAY(char, len + 1);
 892             if (utfName == NULL) {
 893                 throw_new(env, "OutOfMemoryError");
 894                 goto free_body;
 895             }
 896         } else {
 897             utfName = buf;
 898         }
 899         env->GetStringUTFRegion(name, 0, unicode_len, utfName);
 900         //VerifyFixClassname(utfName);
 901         for (uint i = 0; i < len; i++) {
 902           if (utfName[i] == '.')   utfName[i] = '/';
 903         }
 904     } else {
 905         utfName = NULL;
 906     }
 907 
 908     result = JVM_DefineClass(env, utfName, loader, body, length, pd);
 909 
 910     if (utfName && utfName != buf)
 911         FREE_C_HEAP_ARRAY(char, utfName);
 912 
 913  free_body:
 914     FREE_C_HEAP_ARRAY(jbyte, body);
 915     return result;
 916   }
 917 }
 918 
 919 
 920 UNSAFE_ENTRY(jclass, Unsafe_DefineClass0(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length))
 921   UnsafeWrapper("Unsafe_DefineClass");
 922   {
 923     ThreadToNativeFromVM ttnfv(thread);
 924 
 925     int depthFromDefineClass0 = 1;
 926     jclass  caller = JVM_GetCallerClass(env, depthFromDefineClass0);
 927     jobject loader = (caller == NULL) ? NULL : JVM_GetClassLoader(env, caller);
 928     jobject pd     = (caller == NULL) ? NULL : JVM_GetProtectionDomain(env, caller);
 929 
 930     return Unsafe_DefineClass(env, name, data, offset, length, loader, pd);
 931   }
 932 UNSAFE_END
 933 
 934 
 935 UNSAFE_ENTRY(jclass, Unsafe_DefineClass1(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd))
 936   UnsafeWrapper("Unsafe_DefineClass");
 937   {
 938     ThreadToNativeFromVM ttnfv(thread);
 939 
 940     return Unsafe_DefineClass(env, name, data, offset, length, loader, pd);
 941   }
 942 UNSAFE_END
 943 
 944 #define DAC_Args CLS"[B["OBJ
 945 // define a class but do not make it known to the class loader or system dictionary
 946 // - host_class:  supplies context for linkage, access control, protection domain, and class loader
 947 // - data:  bytes of a class file, a raw memory address (length gives the number of bytes)
 948 // - cp_patches:  where non-null entries exist, they replace corresponding CP entries in data
 949 
 950 // When you load an anonymous class U, it works as if you changed its name just before loading,
 951 // to a name that you will never use again.  Since the name is lost, no other class can directly
 952 // link to any member of U.  Just after U is loaded, the only way to use it is reflectively,
 953 // through java.lang.Class methods like Class.newInstance.
 954 
 955 // Access checks for linkage sites within U continue to follow the same rules as for named classes.
 956 // The package of an anonymous class is given by the package qualifier on the name under which it was loaded.
 957 // An anonymous class also has special privileges to access any member of its host class.
 958 // This is the main reason why this loading operation is unsafe.  The purpose of this is to
 959 // allow language implementations to simulate "open classes"; a host class in effect gets
 960 // new code when an anonymous class is loaded alongside it.  A less convenient but more
 961 // standard way to do this is with reflection, which can also be set to ignore access
 962 // restrictions.
 963 
 964 // Access into an anonymous class is possible only through reflection.  Therefore, there
 965 // are no special access rules for calling into an anonymous class.  The relaxed access
 966 // rule for the host class is applied in the opposite direction:  A host class reflectively
 967 // access one of its anonymous classes.
 968 
 969 // If you load the same bytecodes twice, you get two different classes.  You can reload
 970 // the same bytecodes with or without varying CP patches.
 971 
 972 // By using the CP patching array, you can have a new anonymous class U2 refer to an older one U1.
 973 // The bytecodes for U2 should refer to U1 by a symbolic name (doesn't matter what the name is).
 974 // The CONSTANT_Class entry for that name can be patched to refer directly to U1.
 975 
 976 // This allows, for example, U2 to use U1 as a superclass or super-interface, or as
 977 // an outer class (so that U2 is an anonymous inner class of anonymous U1).
 978 // It is not possible for a named class, or an older anonymous class, to refer by
 979 // name (via its CP) to a newer anonymous class.
 980 
 981 // CP patching may also be used to modify (i.e., hack) the names of methods, classes,
 982 // or type descriptors used in the loaded anonymous class.
 983 
 984 // Finally, CP patching may be used to introduce "live" objects into the constant pool,
 985 // instead of "dead" strings.  A compiled statement like println((Object)"hello") can
 986 // be changed to println(greeting), where greeting is an arbitrary object created before
 987 // the anonymous class is loaded.  This is useful in dynamic languages, in which
 988 // various kinds of metaobjects must be introduced as constants into bytecode.
 989 // Note the cast (Object), which tells the verifier to expect an arbitrary object,
 990 // not just a literal string.  For such ldc instructions, the verifier uses the
 991 // type Object instead of String, if the loaded constant is not in fact a String.
 992 
 993 static oop
 994 Unsafe_DefineAnonymousClass_impl(JNIEnv *env,
 995                                  jclass host_class, jbyteArray data, jobjectArray cp_patches_jh,
 996                                  HeapWord* *temp_alloc,
 997                                  TRAPS) {
 998 
 999   if (UsePerfData) {
1000     ClassLoader::unsafe_defineClassCallCounter()->inc();
1001   }
1002 
1003   if (data == NULL) {
1004     THROW_0(vmSymbols::java_lang_NullPointerException());
1005   }
1006 
1007   jint length = typeArrayOop(JNIHandles::resolve_non_null(data))->length();
1008   jint word_length = (length + sizeof(HeapWord)-1) / sizeof(HeapWord);
1009   HeapWord* body = NEW_C_HEAP_ARRAY(HeapWord, word_length);
1010   if (body == NULL) {
1011     THROW_0(vmSymbols::java_lang_OutOfMemoryError());
1012   }
1013 
1014   // caller responsible to free it:
1015   (*temp_alloc) = body;
1016 
1017   {
1018     jbyte* array_base = typeArrayOop(JNIHandles::resolve_non_null(data))->byte_at_addr(0);
1019     Copy::conjoint_words((HeapWord*) array_base, body, word_length);
1020   }
1021 
1022   u1* class_bytes = (u1*) body;
1023   int class_bytes_length = (int) length;
1024   if (class_bytes_length < 0)  class_bytes_length = 0;
1025   if (class_bytes == NULL
1026       || host_class == NULL
1027       || length != class_bytes_length)
1028     THROW_0(vmSymbols::java_lang_IllegalArgumentException());
1029 
1030   objArrayHandle cp_patches_h;
1031   if (cp_patches_jh != NULL) {
1032     oop p = JNIHandles::resolve_non_null(cp_patches_jh);
1033     if (!p->is_objArray())
1034       THROW_0(vmSymbols::java_lang_IllegalArgumentException());
1035     cp_patches_h = objArrayHandle(THREAD, (objArrayOop)p);
1036   }
1037 
1038   KlassHandle host_klass(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(host_class)));
1039   const char* host_source = host_klass->external_name();
1040   Handle      host_loader(THREAD, host_klass->class_loader());
1041   Handle      host_domain(THREAD, host_klass->protection_domain());
1042 
1043   GrowableArray<Handle>* cp_patches = NULL;
1044   if (cp_patches_h.not_null()) {
1045     int alen = cp_patches_h->length();
1046     for (int i = alen-1; i >= 0; i--) {
1047       oop p = cp_patches_h->obj_at(i);
1048       if (p != NULL) {
1049         Handle patch(THREAD, p);
1050         if (cp_patches == NULL)
1051           cp_patches = new GrowableArray<Handle>(i+1, i+1, Handle());
1052         cp_patches->at_put(i, patch);
1053       }
1054     }
1055   }
1056 
1057   ClassFileStream st(class_bytes, class_bytes_length, (char*) host_source);
1058 
1059   instanceKlassHandle anon_klass;
1060   {
1061     Symbol* no_class_name = NULL;
1062     klassOop anonk = SystemDictionary::parse_stream(no_class_name,
1063                                                     host_loader, host_domain,
1064                                                     &st, host_klass, cp_patches,
1065                                                     CHECK_NULL);
1066     if (anonk == NULL)  return NULL;
1067     anon_klass = instanceKlassHandle(THREAD, anonk);
1068   }
1069 
1070   // let caller initialize it as needed...
1071 
1072   return anon_klass->java_mirror();
1073 }
1074 
1075 UNSAFE_ENTRY(jclass, Unsafe_DefineAnonymousClass(JNIEnv *env, jobject unsafe, jclass host_class, jbyteArray data, jobjectArray cp_patches_jh))
1076 {
1077   UnsafeWrapper("Unsafe_DefineAnonymousClass");
1078   ResourceMark rm(THREAD);
1079 
1080   HeapWord* temp_alloc = NULL;
1081 
1082   jobject res_jh = NULL;
1083 
1084   { oop res_oop = Unsafe_DefineAnonymousClass_impl(env,
1085                                                    host_class, data, cp_patches_jh,
1086                                                    &temp_alloc, THREAD);
1087     if (res_oop != NULL)
1088       res_jh = JNIHandles::make_local(env, res_oop);
1089   }
1090 
1091   // try/finally clause:
1092   if (temp_alloc != NULL) {
1093     FREE_C_HEAP_ARRAY(HeapWord, temp_alloc);
1094   }
1095 
1096   return (jclass) res_jh;
1097 }
1098 UNSAFE_END
1099 
1100 
1101 
1102 UNSAFE_ENTRY(void, Unsafe_MonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
1103   UnsafeWrapper("Unsafe_MonitorEnter");
1104   {
1105     if (jobj == NULL) {
1106       THROW(vmSymbols::java_lang_NullPointerException());
1107     }
1108     Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1109     ObjectSynchronizer::jni_enter(obj, CHECK);
1110   }
1111 UNSAFE_END
1112 
1113 
1114 UNSAFE_ENTRY(jboolean, Unsafe_TryMonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
1115   UnsafeWrapper("Unsafe_TryMonitorEnter");
1116   {
1117     if (jobj == NULL) {
1118       THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
1119     }
1120     Handle obj(thread, JNIHandles::resolve_non_null(jobj));
1121     bool res = ObjectSynchronizer::jni_try_enter(obj, CHECK_0);
1122     return (res ? JNI_TRUE : JNI_FALSE);
1123   }
1124 UNSAFE_END
1125 
1126 
1127 UNSAFE_ENTRY(void, Unsafe_MonitorExit(JNIEnv *env, jobject unsafe, jobject jobj))
1128   UnsafeWrapper("Unsafe_MonitorExit");
1129   {
1130     if (jobj == NULL) {
1131       THROW(vmSymbols::java_lang_NullPointerException());
1132     }
1133     Handle obj(THREAD, JNIHandles::resolve_non_null(jobj));
1134     ObjectSynchronizer::jni_exit(obj(), CHECK);
1135   }
1136 UNSAFE_END
1137 
1138 
1139 UNSAFE_ENTRY(void, Unsafe_ThrowException(JNIEnv *env, jobject unsafe, jthrowable thr))
1140   UnsafeWrapper("Unsafe_ThrowException");
1141   {
1142     ThreadToNativeFromVM ttnfv(thread);
1143     env->Throw(thr);
1144   }
1145 UNSAFE_END
1146 
1147 // JSR166 ------------------------------------------------------------------
1148 
1149 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject e_h, jobject x_h))
1150   UnsafeWrapper("Unsafe_CompareAndSwapObject");
1151   oop x = JNIHandles::resolve(x_h);
1152   oop e = JNIHandles::resolve(e_h);
1153   oop p = JNIHandles::resolve(obj);
1154   HeapWord* addr = (HeapWord *)index_oop_from_field_offset_long(p, offset);
1155   if (UseCompressedOops) {
1156     update_barrier_set_pre((narrowOop*)addr, e);
1157   } else {
1158     update_barrier_set_pre((oop*)addr, e);
1159   }
1160   oop res = oopDesc::atomic_compare_exchange_oop(x, addr, e);
1161   jboolean success  = (res == e);
1162   if (success)
1163     update_barrier_set((void*)addr, x);
1164   return success;
1165 UNSAFE_END
1166 
1167 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint e, jint x))
1168   UnsafeWrapper("Unsafe_CompareAndSwapInt");
1169   oop p = JNIHandles::resolve(obj);
1170   jint* addr = (jint *) index_oop_from_field_offset_long(p, offset);
1171   return (jint)(Atomic::cmpxchg(x, addr, e)) == e;
1172 UNSAFE_END
1173 
1174 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong e, jlong x))
1175   UnsafeWrapper("Unsafe_CompareAndSwapLong");
1176   Handle p (THREAD, JNIHandles::resolve(obj));
1177   jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
1178   if (VM_Version::supports_cx8())
1179     return (jlong)(Atomic::cmpxchg(x, addr, e)) == e;
1180   else {
1181     jboolean success = false;
1182     ObjectLocker ol(p, THREAD);
1183     if (*addr == e) { *addr = x; success = true; }
1184     return success;
1185   }
1186 UNSAFE_END
1187 
1188 UNSAFE_ENTRY(void, Unsafe_Park(JNIEnv *env, jobject unsafe, jboolean isAbsolute, jlong time))
1189   UnsafeWrapper("Unsafe_Park");
1190   HS_DTRACE_PROBE3(hotspot, thread__park__begin, thread->parker(), (int) isAbsolute, time);
1191   JavaThreadParkedState jtps(thread, time != 0);
1192   thread->parker()->park(isAbsolute != 0, time);
1193   HS_DTRACE_PROBE1(hotspot, thread__park__end, thread->parker());
1194 UNSAFE_END
1195 
1196 UNSAFE_ENTRY(void, Unsafe_Unpark(JNIEnv *env, jobject unsafe, jobject jthread))
1197   UnsafeWrapper("Unsafe_Unpark");
1198   Parker* p = NULL;
1199   if (jthread != NULL) {
1200     oop java_thread = JNIHandles::resolve_non_null(jthread);
1201     if (java_thread != NULL) {
1202       jlong lp = java_lang_Thread::park_event(java_thread);
1203       if (lp != 0) {
1204         // This cast is OK even though the jlong might have been read
1205         // non-atomically on 32bit systems, since there, one word will
1206         // always be zero anyway and the value set is always the same
1207         p = (Parker*)addr_from_java(lp);
1208       } else {
1209         // Grab lock if apparently null or using older version of library
1210         MutexLocker mu(Threads_lock);
1211         java_thread = JNIHandles::resolve_non_null(jthread);
1212         if (java_thread != NULL) {
1213           JavaThread* thr = java_lang_Thread::thread(java_thread);
1214           if (thr != NULL) {
1215             p = thr->parker();
1216             if (p != NULL) { // Bind to Java thread for next time.
1217               java_lang_Thread::set_park_event(java_thread, addr_to_java(p));
1218             }
1219           }
1220         }
1221       }
1222     }
1223   }
1224   if (p != NULL) {
1225     HS_DTRACE_PROBE1(hotspot, thread__unpark, p);
1226     p->unpark();
1227   }
1228 UNSAFE_END
1229 
1230 UNSAFE_ENTRY(jint, Unsafe_Loadavg(JNIEnv *env, jobject unsafe, jdoubleArray loadavg, jint nelem))
1231   UnsafeWrapper("Unsafe_Loadavg");
1232   const int max_nelem = 3;
1233   double la[max_nelem];
1234   jint ret;
1235 
1236   typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(loadavg));
1237   assert(a->is_typeArray(), "must be type array");
1238 
1239   if (nelem < 0 || nelem > max_nelem || a->length() < nelem) {
1240     ThreadToNativeFromVM ttnfv(thread);
1241     throw_new(env, "ArrayIndexOutOfBoundsException");
1242     return -1;
1243   }
1244 
1245   ret = os::loadavg(la, nelem);
1246   if (ret == -1) return -1;
1247 
1248   // if successful, ret is the number of samples actually retrieved.
1249   assert(ret >= 0 && ret <= max_nelem, "Unexpected loadavg return value");
1250   switch(ret) {
1251     case 3: a->double_at_put(2, (jdouble)la[2]); // fall through
1252     case 2: a->double_at_put(1, (jdouble)la[1]); // fall through
1253     case 1: a->double_at_put(0, (jdouble)la[0]); break;
1254   }
1255   return ret;
1256 UNSAFE_END
1257 
1258 UNSAFE_ENTRY(void, Unsafe_PrefetchRead(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1259   UnsafeWrapper("Unsafe_PrefetchRead");
1260   oop p = JNIHandles::resolve(obj);
1261   void* addr = index_oop_from_field_offset_long(p, 0);
1262   Prefetch::read(addr, (intx)offset);
1263 UNSAFE_END
1264 
1265 UNSAFE_ENTRY(void, Unsafe_PrefetchWrite(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
1266   UnsafeWrapper("Unsafe_PrefetchWrite");
1267   oop p = JNIHandles::resolve(obj);
1268   void* addr = index_oop_from_field_offset_long(p, 0);
1269   Prefetch::write(addr, (intx)offset);
1270 UNSAFE_END
1271 
1272 
1273 /// JVM_RegisterUnsafeMethods
1274 
1275 #define ADR "J"
1276 
1277 #define LANG "Ljava/lang/"
1278 
1279 #define OBJ LANG"Object;"
1280 #define CLS LANG"Class;"
1281 #define CTR LANG"reflect/Constructor;"
1282 #define FLD LANG"reflect/Field;"
1283 #define MTH LANG"reflect/Method;"
1284 #define THR LANG"Throwable;"
1285 
1286 #define DC0_Args LANG"String;[BII"
1287 #define DC1_Args DC0_Args LANG"ClassLoader;" "Ljava/security/ProtectionDomain;"
1288 
1289 #define CC (char*)  /*cast a literal from (const char*)*/
1290 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
1291 
1292 // define deprecated accessors for compabitility with 1.4.0
1293 #define DECLARE_GETSETOOP_140(Boolean, Z) \
1294     {CC"get"#Boolean,      CC"("OBJ"I)"#Z,      FN_PTR(Unsafe_Get##Boolean##140)}, \
1295     {CC"put"#Boolean,      CC"("OBJ"I"#Z")V",   FN_PTR(Unsafe_Set##Boolean##140)}
1296 
1297 // Note:  In 1.4.1, getObject and kin take both int and long offsets.
1298 #define DECLARE_GETSETOOP_141(Boolean, Z) \
1299     {CC"get"#Boolean,      CC"("OBJ"J)"#Z,      FN_PTR(Unsafe_Get##Boolean)}, \
1300     {CC"put"#Boolean,      CC"("OBJ"J"#Z")V",   FN_PTR(Unsafe_Set##Boolean)}
1301 
1302 // Note:  In 1.5.0, there are volatile versions too
1303 #define DECLARE_GETSETOOP(Boolean, Z) \
1304     {CC"get"#Boolean,      CC"("OBJ"J)"#Z,      FN_PTR(Unsafe_Get##Boolean)}, \
1305     {CC"put"#Boolean,      CC"("OBJ"J"#Z")V",   FN_PTR(Unsafe_Set##Boolean)}, \
1306     {CC"get"#Boolean"Volatile",      CC"("OBJ"J)"#Z,      FN_PTR(Unsafe_Get##Boolean##Volatile)}, \
1307     {CC"put"#Boolean"Volatile",      CC"("OBJ"J"#Z")V",   FN_PTR(Unsafe_Set##Boolean##Volatile)}
1308 
1309 
1310 #define DECLARE_GETSETNATIVE(Byte, B) \
1311     {CC"get"#Byte,         CC"("ADR")"#B,       FN_PTR(Unsafe_GetNative##Byte)}, \
1312     {CC"put"#Byte,         CC"("ADR#B")V",      FN_PTR(Unsafe_SetNative##Byte)}
1313 
1314 
1315 
1316 // %%% These are temporarily supported until the SDK sources
1317 // contain the necessarily updated Unsafe.java.
1318 static JNINativeMethod methods_140[] = {
1319 
1320     {CC"getObject",        CC"("OBJ"I)"OBJ"",   FN_PTR(Unsafe_GetObject140)},
1321     {CC"putObject",        CC"("OBJ"I"OBJ")V",  FN_PTR(Unsafe_SetObject140)},
1322 
1323     DECLARE_GETSETOOP_140(Boolean, Z),
1324     DECLARE_GETSETOOP_140(Byte, B),
1325     DECLARE_GETSETOOP_140(Short, S),
1326     DECLARE_GETSETOOP_140(Char, C),
1327     DECLARE_GETSETOOP_140(Int, I),
1328     DECLARE_GETSETOOP_140(Long, J),
1329     DECLARE_GETSETOOP_140(Float, F),
1330     DECLARE_GETSETOOP_140(Double, D),
1331 
1332     DECLARE_GETSETNATIVE(Byte, B),
1333     DECLARE_GETSETNATIVE(Short, S),
1334     DECLARE_GETSETNATIVE(Char, C),
1335     DECLARE_GETSETNATIVE(Int, I),
1336     DECLARE_GETSETNATIVE(Long, J),
1337     DECLARE_GETSETNATIVE(Float, F),
1338     DECLARE_GETSETNATIVE(Double, D),
1339 
1340     {CC"getAddress",         CC"("ADR")"ADR,             FN_PTR(Unsafe_GetNativeAddress)},
1341     {CC"putAddress",         CC"("ADR""ADR")V",          FN_PTR(Unsafe_SetNativeAddress)},
1342 
1343     {CC"allocateMemory",     CC"(J)"ADR,                 FN_PTR(Unsafe_AllocateMemory)},
1344     {CC"reallocateMemory",   CC"("ADR"J)"ADR,            FN_PTR(Unsafe_ReallocateMemory)},
1345 //  {CC"setMemory",          CC"("ADR"JB)V",             FN_PTR(Unsafe_SetMemory)},
1346 //  {CC"copyMemory",         CC"("ADR ADR"J)V",          FN_PTR(Unsafe_CopyMemory)},
1347     {CC"freeMemory",         CC"("ADR")V",               FN_PTR(Unsafe_FreeMemory)},
1348 
1349     {CC"fieldOffset",        CC"("FLD")I",               FN_PTR(Unsafe_FieldOffset)}, //deprecated
1350     {CC"staticFieldBase",    CC"("CLS")"OBJ,             FN_PTR(Unsafe_StaticFieldBaseFromClass)}, //deprecated
1351     {CC"ensureClassInitialized",CC"("CLS")V",            FN_PTR(Unsafe_EnsureClassInitialized)},
1352     {CC"arrayBaseOffset",    CC"("CLS")I",               FN_PTR(Unsafe_ArrayBaseOffset)},
1353     {CC"arrayIndexScale",    CC"("CLS")I",               FN_PTR(Unsafe_ArrayIndexScale)},
1354     {CC"addressSize",        CC"()I",                    FN_PTR(Unsafe_AddressSize)},
1355     {CC"pageSize",           CC"()I",                    FN_PTR(Unsafe_PageSize)},
1356 
1357     {CC"defineClass",        CC"("DC0_Args")"CLS,        FN_PTR(Unsafe_DefineClass0)},
1358     {CC"defineClass",        CC"("DC1_Args")"CLS,        FN_PTR(Unsafe_DefineClass1)},
1359     {CC"allocateInstance",   CC"("CLS")"OBJ,             FN_PTR(Unsafe_AllocateInstance)},
1360     {CC"monitorEnter",       CC"("OBJ")V",               FN_PTR(Unsafe_MonitorEnter)},
1361     {CC"monitorExit",        CC"("OBJ")V",               FN_PTR(Unsafe_MonitorExit)},
1362     {CC"throwException",     CC"("THR")V",               FN_PTR(Unsafe_ThrowException)}
1363 };
1364 
1365 // These are the old methods prior to the JSR 166 changes in 1.5.0
1366 static JNINativeMethod methods_141[] = {
1367 
1368     {CC"getObject",        CC"("OBJ"J)"OBJ"",   FN_PTR(Unsafe_GetObject)},
1369     {CC"putObject",        CC"("OBJ"J"OBJ")V",  FN_PTR(Unsafe_SetObject)},
1370 
1371     DECLARE_GETSETOOP_141(Boolean, Z),
1372     DECLARE_GETSETOOP_141(Byte, B),
1373     DECLARE_GETSETOOP_141(Short, S),
1374     DECLARE_GETSETOOP_141(Char, C),
1375     DECLARE_GETSETOOP_141(Int, I),
1376     DECLARE_GETSETOOP_141(Long, J),
1377     DECLARE_GETSETOOP_141(Float, F),
1378     DECLARE_GETSETOOP_141(Double, D),
1379 
1380     DECLARE_GETSETNATIVE(Byte, B),
1381     DECLARE_GETSETNATIVE(Short, S),
1382     DECLARE_GETSETNATIVE(Char, C),
1383     DECLARE_GETSETNATIVE(Int, I),
1384     DECLARE_GETSETNATIVE(Long, J),
1385     DECLARE_GETSETNATIVE(Float, F),
1386     DECLARE_GETSETNATIVE(Double, D),
1387 
1388     {CC"getAddress",         CC"("ADR")"ADR,             FN_PTR(Unsafe_GetNativeAddress)},
1389     {CC"putAddress",         CC"("ADR""ADR")V",          FN_PTR(Unsafe_SetNativeAddress)},
1390 
1391     {CC"allocateMemory",     CC"(J)"ADR,                 FN_PTR(Unsafe_AllocateMemory)},
1392     {CC"reallocateMemory",   CC"("ADR"J)"ADR,            FN_PTR(Unsafe_ReallocateMemory)},
1393 //  {CC"setMemory",          CC"("ADR"JB)V",             FN_PTR(Unsafe_SetMemory)},
1394 //  {CC"copyMemory",         CC"("ADR ADR"J)V",          FN_PTR(Unsafe_CopyMemory)},
1395     {CC"freeMemory",         CC"("ADR")V",               FN_PTR(Unsafe_FreeMemory)},
1396 
1397     {CC"objectFieldOffset",  CC"("FLD")J",               FN_PTR(Unsafe_ObjectFieldOffset)},
1398     {CC"staticFieldOffset",  CC"("FLD")J",               FN_PTR(Unsafe_StaticFieldOffset)},
1399     {CC"staticFieldBase",    CC"("FLD")"OBJ,             FN_PTR(Unsafe_StaticFieldBaseFromField)},
1400     {CC"ensureClassInitialized",CC"("CLS")V",            FN_PTR(Unsafe_EnsureClassInitialized)},
1401     {CC"arrayBaseOffset",    CC"("CLS")I",               FN_PTR(Unsafe_ArrayBaseOffset)},
1402     {CC"arrayIndexScale",    CC"("CLS")I",               FN_PTR(Unsafe_ArrayIndexScale)},
1403     {CC"addressSize",        CC"()I",                    FN_PTR(Unsafe_AddressSize)},
1404     {CC"pageSize",           CC"()I",                    FN_PTR(Unsafe_PageSize)},
1405 
1406     {CC"defineClass",        CC"("DC0_Args")"CLS,        FN_PTR(Unsafe_DefineClass0)},
1407     {CC"defineClass",        CC"("DC1_Args")"CLS,        FN_PTR(Unsafe_DefineClass1)},
1408     {CC"allocateInstance",   CC"("CLS")"OBJ,             FN_PTR(Unsafe_AllocateInstance)},
1409     {CC"monitorEnter",       CC"("OBJ")V",               FN_PTR(Unsafe_MonitorEnter)},
1410     {CC"monitorExit",        CC"("OBJ")V",               FN_PTR(Unsafe_MonitorExit)},
1411     {CC"throwException",     CC"("THR")V",               FN_PTR(Unsafe_ThrowException)}
1412 
1413 };
1414 
1415 // These are the old methods prior to the JSR 166 changes in 1.6.0
1416 static JNINativeMethod methods_15[] = {
1417 
1418     {CC"getObject",        CC"("OBJ"J)"OBJ"",   FN_PTR(Unsafe_GetObject)},
1419     {CC"putObject",        CC"("OBJ"J"OBJ")V",  FN_PTR(Unsafe_SetObject)},
1420     {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"",   FN_PTR(Unsafe_GetObjectVolatile)},
1421     {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V",  FN_PTR(Unsafe_SetObjectVolatile)},
1422 
1423 
1424     DECLARE_GETSETOOP(Boolean, Z),
1425     DECLARE_GETSETOOP(Byte, B),
1426     DECLARE_GETSETOOP(Short, S),
1427     DECLARE_GETSETOOP(Char, C),
1428     DECLARE_GETSETOOP(Int, I),
1429     DECLARE_GETSETOOP(Long, J),
1430     DECLARE_GETSETOOP(Float, F),
1431     DECLARE_GETSETOOP(Double, D),
1432 
1433     DECLARE_GETSETNATIVE(Byte, B),
1434     DECLARE_GETSETNATIVE(Short, S),
1435     DECLARE_GETSETNATIVE(Char, C),
1436     DECLARE_GETSETNATIVE(Int, I),
1437     DECLARE_GETSETNATIVE(Long, J),
1438     DECLARE_GETSETNATIVE(Float, F),
1439     DECLARE_GETSETNATIVE(Double, D),
1440 
1441     {CC"getAddress",         CC"("ADR")"ADR,             FN_PTR(Unsafe_GetNativeAddress)},
1442     {CC"putAddress",         CC"("ADR""ADR")V",          FN_PTR(Unsafe_SetNativeAddress)},
1443 
1444     {CC"allocateMemory",     CC"(J)"ADR,                 FN_PTR(Unsafe_AllocateMemory)},
1445     {CC"reallocateMemory",   CC"("ADR"J)"ADR,            FN_PTR(Unsafe_ReallocateMemory)},
1446 //  {CC"setMemory",          CC"("ADR"JB)V",             FN_PTR(Unsafe_SetMemory)},
1447 //  {CC"copyMemory",         CC"("ADR ADR"J)V",          FN_PTR(Unsafe_CopyMemory)},
1448     {CC"freeMemory",         CC"("ADR")V",               FN_PTR(Unsafe_FreeMemory)},
1449 
1450     {CC"objectFieldOffset",  CC"("FLD")J",               FN_PTR(Unsafe_ObjectFieldOffset)},
1451     {CC"staticFieldOffset",  CC"("FLD")J",               FN_PTR(Unsafe_StaticFieldOffset)},
1452     {CC"staticFieldBase",    CC"("FLD")"OBJ,             FN_PTR(Unsafe_StaticFieldBaseFromField)},
1453     {CC"ensureClassInitialized",CC"("CLS")V",            FN_PTR(Unsafe_EnsureClassInitialized)},
1454     {CC"arrayBaseOffset",    CC"("CLS")I",               FN_PTR(Unsafe_ArrayBaseOffset)},
1455     {CC"arrayIndexScale",    CC"("CLS")I",               FN_PTR(Unsafe_ArrayIndexScale)},
1456     {CC"addressSize",        CC"()I",                    FN_PTR(Unsafe_AddressSize)},
1457     {CC"pageSize",           CC"()I",                    FN_PTR(Unsafe_PageSize)},
1458 
1459     {CC"defineClass",        CC"("DC0_Args")"CLS,        FN_PTR(Unsafe_DefineClass0)},
1460     {CC"defineClass",        CC"("DC1_Args")"CLS,        FN_PTR(Unsafe_DefineClass1)},
1461     {CC"allocateInstance",   CC"("CLS")"OBJ,             FN_PTR(Unsafe_AllocateInstance)},
1462     {CC"monitorEnter",       CC"("OBJ")V",               FN_PTR(Unsafe_MonitorEnter)},
1463     {CC"monitorExit",        CC"("OBJ")V",               FN_PTR(Unsafe_MonitorExit)},
1464     {CC"throwException",     CC"("THR")V",               FN_PTR(Unsafe_ThrowException)},
1465     {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z",  FN_PTR(Unsafe_CompareAndSwapObject)},
1466     {CC"compareAndSwapInt",  CC"("OBJ"J""I""I"")Z",      FN_PTR(Unsafe_CompareAndSwapInt)},
1467     {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z",      FN_PTR(Unsafe_CompareAndSwapLong)},
1468     {CC"park",               CC"(ZJ)V",                  FN_PTR(Unsafe_Park)},
1469     {CC"unpark",             CC"("OBJ")V",               FN_PTR(Unsafe_Unpark)}
1470 
1471 };
1472 
1473 // These are the correct methods, moving forward:
1474 static JNINativeMethod methods[] = {
1475 
1476     {CC"getObject",        CC"("OBJ"J)"OBJ"",   FN_PTR(Unsafe_GetObject)},
1477     {CC"putObject",        CC"("OBJ"J"OBJ")V",  FN_PTR(Unsafe_SetObject)},
1478     {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"",   FN_PTR(Unsafe_GetObjectVolatile)},
1479     {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V",  FN_PTR(Unsafe_SetObjectVolatile)},
1480 
1481 
1482     DECLARE_GETSETOOP(Boolean, Z),
1483     DECLARE_GETSETOOP(Byte, B),
1484     DECLARE_GETSETOOP(Short, S),
1485     DECLARE_GETSETOOP(Char, C),
1486     DECLARE_GETSETOOP(Int, I),
1487     DECLARE_GETSETOOP(Long, J),
1488     DECLARE_GETSETOOP(Float, F),
1489     DECLARE_GETSETOOP(Double, D),
1490 
1491     DECLARE_GETSETNATIVE(Byte, B),
1492     DECLARE_GETSETNATIVE(Short, S),
1493     DECLARE_GETSETNATIVE(Char, C),
1494     DECLARE_GETSETNATIVE(Int, I),
1495     DECLARE_GETSETNATIVE(Long, J),
1496     DECLARE_GETSETNATIVE(Float, F),
1497     DECLARE_GETSETNATIVE(Double, D),
1498 
1499     {CC"getAddress",         CC"("ADR")"ADR,             FN_PTR(Unsafe_GetNativeAddress)},
1500     {CC"putAddress",         CC"("ADR""ADR")V",          FN_PTR(Unsafe_SetNativeAddress)},
1501 
1502     {CC"allocateMemory",     CC"(J)"ADR,                 FN_PTR(Unsafe_AllocateMemory)},
1503     {CC"reallocateMemory",   CC"("ADR"J)"ADR,            FN_PTR(Unsafe_ReallocateMemory)},
1504 //  {CC"setMemory",          CC"("ADR"JB)V",             FN_PTR(Unsafe_SetMemory)},
1505 //  {CC"copyMemory",         CC"("ADR ADR"J)V",          FN_PTR(Unsafe_CopyMemory)},
1506     {CC"freeMemory",         CC"("ADR")V",               FN_PTR(Unsafe_FreeMemory)},
1507 
1508     {CC"objectFieldOffset",  CC"("FLD")J",               FN_PTR(Unsafe_ObjectFieldOffset)},
1509     {CC"staticFieldOffset",  CC"("FLD")J",               FN_PTR(Unsafe_StaticFieldOffset)},
1510     {CC"staticFieldBase",    CC"("FLD")"OBJ,             FN_PTR(Unsafe_StaticFieldBaseFromField)},
1511     {CC"ensureClassInitialized",CC"("CLS")V",            FN_PTR(Unsafe_EnsureClassInitialized)},
1512     {CC"arrayBaseOffset",    CC"("CLS")I",               FN_PTR(Unsafe_ArrayBaseOffset)},
1513     {CC"arrayIndexScale",    CC"("CLS")I",               FN_PTR(Unsafe_ArrayIndexScale)},
1514     {CC"addressSize",        CC"()I",                    FN_PTR(Unsafe_AddressSize)},
1515     {CC"pageSize",           CC"()I",                    FN_PTR(Unsafe_PageSize)},
1516 
1517     {CC"defineClass",        CC"("DC0_Args")"CLS,        FN_PTR(Unsafe_DefineClass0)},
1518     {CC"defineClass",        CC"("DC1_Args")"CLS,        FN_PTR(Unsafe_DefineClass1)},
1519     {CC"allocateInstance",   CC"("CLS")"OBJ,             FN_PTR(Unsafe_AllocateInstance)},
1520     {CC"monitorEnter",       CC"("OBJ")V",               FN_PTR(Unsafe_MonitorEnter)},
1521     {CC"monitorExit",        CC"("OBJ")V",               FN_PTR(Unsafe_MonitorExit)},
1522     {CC"tryMonitorEnter",    CC"("OBJ")Z",               FN_PTR(Unsafe_TryMonitorEnter)},
1523     {CC"throwException",     CC"("THR")V",               FN_PTR(Unsafe_ThrowException)},
1524     {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z",  FN_PTR(Unsafe_CompareAndSwapObject)},
1525     {CC"compareAndSwapInt",  CC"("OBJ"J""I""I"")Z",      FN_PTR(Unsafe_CompareAndSwapInt)},
1526     {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z",      FN_PTR(Unsafe_CompareAndSwapLong)},
1527     {CC"putOrderedObject",   CC"("OBJ"J"OBJ")V",         FN_PTR(Unsafe_SetOrderedObject)},
1528     {CC"putOrderedInt",      CC"("OBJ"JI)V",             FN_PTR(Unsafe_SetOrderedInt)},
1529     {CC"putOrderedLong",     CC"("OBJ"JJ)V",             FN_PTR(Unsafe_SetOrderedLong)},
1530     {CC"park",               CC"(ZJ)V",                  FN_PTR(Unsafe_Park)},
1531     {CC"unpark",             CC"("OBJ")V",               FN_PTR(Unsafe_Unpark)}
1532 
1533 //    {CC"getLoadAverage",     CC"([DI)I",                 FN_PTR(Unsafe_Loadavg)},
1534 
1535 //    {CC"prefetchRead",       CC"("OBJ"J)V",              FN_PTR(Unsafe_PrefetchRead)},
1536 //    {CC"prefetchWrite",      CC"("OBJ"J)V",              FN_PTR(Unsafe_PrefetchWrite)}
1537 //    {CC"prefetchReadStatic", CC"("OBJ"J)V",              FN_PTR(Unsafe_PrefetchRead)},
1538 //    {CC"prefetchWriteStatic",CC"("OBJ"J)V",              FN_PTR(Unsafe_PrefetchWrite)}
1539 
1540 };
1541 
1542 JNINativeMethod loadavg_method[] = {
1543     {CC"getLoadAverage",            CC"([DI)I",                 FN_PTR(Unsafe_Loadavg)}
1544 };
1545 
1546 JNINativeMethod prefetch_methods[] = {
1547     {CC"prefetchRead",       CC"("OBJ"J)V",              FN_PTR(Unsafe_PrefetchRead)},
1548     {CC"prefetchWrite",      CC"("OBJ"J)V",              FN_PTR(Unsafe_PrefetchWrite)},
1549     {CC"prefetchReadStatic", CC"("OBJ"J)V",              FN_PTR(Unsafe_PrefetchRead)},
1550     {CC"prefetchWriteStatic",CC"("OBJ"J)V",              FN_PTR(Unsafe_PrefetchWrite)}
1551 };
1552 
1553 JNINativeMethod memcopy_methods[] = {
1554     {CC"copyMemory",         CC"("OBJ"J"OBJ"JJ)V",       FN_PTR(Unsafe_CopyMemory2)},
1555     {CC"setMemory",          CC"("OBJ"JJB)V",            FN_PTR(Unsafe_SetMemory2)}
1556 };
1557 
1558 JNINativeMethod memcopy_methods_15[] = {
1559     {CC"setMemory",          CC"("ADR"JB)V",             FN_PTR(Unsafe_SetMemory)},
1560     {CC"copyMemory",         CC"("ADR ADR"J)V",          FN_PTR(Unsafe_CopyMemory)}
1561 };
1562 
1563 JNINativeMethod anonk_methods[] = {
1564     {CC"defineAnonymousClass", CC"("DAC_Args")"CLS,      FN_PTR(Unsafe_DefineAnonymousClass)},
1565 };
1566 
1567 #undef CC
1568 #undef FN_PTR
1569 
1570 #undef ADR
1571 #undef LANG
1572 #undef OBJ
1573 #undef CLS
1574 #undef CTR
1575 #undef FLD
1576 #undef MTH
1577 #undef THR
1578 #undef DC0_Args
1579 #undef DC1_Args
1580 
1581 #undef DECLARE_GETSETOOP
1582 #undef DECLARE_GETSETNATIVE
1583 
1584 
1585 // This one function is exported, used by NativeLookup.
1586 // The Unsafe_xxx functions above are called only from the interpreter.
1587 // The optimizer looks at names and signatures to recognize
1588 // individual functions.
1589 
1590 JVM_ENTRY(void, JVM_RegisterUnsafeMethods(JNIEnv *env, jclass unsafecls))
1591   UnsafeWrapper("JVM_RegisterUnsafeMethods");
1592   {
1593     ThreadToNativeFromVM ttnfv(thread);
1594     {
1595       env->RegisterNatives(unsafecls, loadavg_method, sizeof(loadavg_method)/sizeof(JNINativeMethod));
1596       if (env->ExceptionOccurred()) {
1597         if (PrintMiscellaneous && (Verbose || WizardMode)) {
1598           tty->print_cr("Warning:  SDK 1.6 Unsafe.loadavg not found.");
1599         }
1600         env->ExceptionClear();
1601       }
1602     }
1603     {
1604       env->RegisterNatives(unsafecls, prefetch_methods, sizeof(prefetch_methods)/sizeof(JNINativeMethod));
1605       if (env->ExceptionOccurred()) {
1606         if (PrintMiscellaneous && (Verbose || WizardMode)) {
1607           tty->print_cr("Warning:  SDK 1.6 Unsafe.prefetchRead/Write not found.");
1608         }
1609         env->ExceptionClear();
1610       }
1611     }
1612     {
1613       env->RegisterNatives(unsafecls, memcopy_methods, sizeof(memcopy_methods)/sizeof(JNINativeMethod));
1614       if (env->ExceptionOccurred()) {
1615         if (PrintMiscellaneous && (Verbose || WizardMode)) {
1616           tty->print_cr("Warning:  SDK 1.7 Unsafe.copyMemory not found.");
1617         }
1618         env->ExceptionClear();
1619         env->RegisterNatives(unsafecls, memcopy_methods_15, sizeof(memcopy_methods_15)/sizeof(JNINativeMethod));
1620         if (env->ExceptionOccurred()) {
1621           if (PrintMiscellaneous && (Verbose || WizardMode)) {
1622             tty->print_cr("Warning:  SDK 1.5 Unsafe.copyMemory not found.");
1623           }
1624           env->ExceptionClear();
1625         }
1626       }
1627     }
1628     if (EnableInvokeDynamic) {
1629       env->RegisterNatives(unsafecls, anonk_methods, sizeof(anonk_methods)/sizeof(JNINativeMethod));
1630       if (env->ExceptionOccurred()) {
1631         if (PrintMiscellaneous && (Verbose || WizardMode)) {
1632           tty->print_cr("Warning:  SDK 1.7 Unsafe.defineClass (anonymous version) not found.");
1633         }
1634         env->ExceptionClear();
1635       }
1636     }
1637     int status = env->RegisterNatives(unsafecls, methods, sizeof(methods)/sizeof(JNINativeMethod));
1638     if (env->ExceptionOccurred()) {
1639       if (PrintMiscellaneous && (Verbose || WizardMode)) {
1640         tty->print_cr("Warning:  SDK 1.6 version of Unsafe not found.");
1641       }
1642       env->ExceptionClear();
1643       // %%% For now, be backward compatible with an older class:
1644       status = env->RegisterNatives(unsafecls, methods_15, sizeof(methods_15)/sizeof(JNINativeMethod));
1645     }
1646     if (env->ExceptionOccurred()) {
1647       if (PrintMiscellaneous && (Verbose || WizardMode)) {
1648         tty->print_cr("Warning:  SDK 1.5 version of Unsafe not found.");
1649       }
1650       env->ExceptionClear();
1651       // %%% For now, be backward compatible with an older class:
1652       status = env->RegisterNatives(unsafecls, methods_141, sizeof(methods_141)/sizeof(JNINativeMethod));
1653     }
1654     if (env->ExceptionOccurred()) {
1655       if (PrintMiscellaneous && (Verbose || WizardMode)) {
1656         tty->print_cr("Warning:  SDK 1.4.1 version of Unsafe not found.");
1657       }
1658       env->ExceptionClear();
1659       // %%% For now, be backward compatible with an older class:
1660       status = env->RegisterNatives(unsafecls, methods_140, sizeof(methods_140)/sizeof(JNINativeMethod));
1661     }
1662     guarantee(status == 0, "register unsafe natives");
1663   }
1664 JVM_END