jdk8-mips64-public/hotspot: src/share/vm/prims/unsafe.cpp@7301840ea20e (annotated)

src/share/vm/prims/unsafe.cpp@7301840ea20e (annotated)

src/share/vm/prims/unsafe.cpp

Tue, 11 Mar 2014 15:06:34 +0400

author: vlivanov
date: Tue, 11 Mar 2014 15:06:34 +0400
changeset 7179: 7301840ea20e
parent 7129: 47e3110c47e8
child 7535: 7ae4e26cb1e0
child 7547: f46871c6c063
permissions: -rw-r--r--

8023461: Thread holding lock at safepoint that vm can block on: MethodCompileQueue_lock
Reviewed-by: kvn, iveresov

 /*
  * Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #include "precompiled.hpp"
 #include "classfile/vmSymbols.hpp"
 #include "utilities/macros.hpp"
 #if INCLUDE_ALL_GCS
 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"
 #endif // INCLUDE_ALL_GCS
 #include "memory/allocation.inline.hpp"
 #include "prims/jni.h"
 #include "prims/jvm.h"
 #include "runtime/globals.hpp"
 #include "runtime/interfaceSupport.hpp"
 #include "runtime/prefetch.inline.hpp"
 #include "runtime/orderAccess.inline.hpp"
 #include "runtime/reflection.hpp"
 #include "runtime/synchronizer.hpp"
 #include "services/threadService.hpp"
 #include "trace/tracing.hpp"
 #include "utilities/copy.hpp"
 #include "utilities/dtrace.hpp"
 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
 /*
  *      Implementation of class sun.misc.Unsafe
  */
 #ifndef USDT2
 HS_DTRACE_PROBE_DECL3(hotspot, thread__park__begin, uintptr_t, int, long long);
 HS_DTRACE_PROBE_DECL1(hotspot, thread__park__end, uintptr_t);
 HS_DTRACE_PROBE_DECL1(hotspot, thread__unpark, uintptr_t);
 #endif /* !USDT2 */
 #define MAX_OBJECT_SIZE \
   ( arrayOopDesc::header_size(T_DOUBLE) * HeapWordSize \
     + ((julong)max_jint * sizeof(double)) )
 #define UNSAFE_ENTRY(result_type, header) \
   JVM_ENTRY(result_type, header)
 // Can't use UNSAFE_LEAF because it has the signature of a straight
 // call into the runtime (just like JVM_LEAF, funny that) but it's
 // called like a Java Native and thus the wrapper built for it passes
 // arguments like a JNI call.  It expects those arguments to be popped
 // from the stack on Intel like all good JNI args are, and adjusts the
 // stack according.  Since the JVM_LEAF call expects no extra
 // arguments the stack isn't popped in the C code, is pushed by the
 // wrapper and we get sick.
 //#define UNSAFE_LEAF(result_type, header) \
 //  JVM_LEAF(result_type, header)
 #define UNSAFE_END JVM_END
 #define UnsafeWrapper(arg) /*nothing, for the present*/
 inline void* addr_from_java(jlong addr) {
   // This assert fails in a variety of ways on 32-bit systems.
   // It is impossible to predict whether native code that converts
   // pointers to longs will sign-extend or zero-extend the addresses.
   //assert(addr == (uintptr_t)addr, "must not be odd high bits");
   return (void*)(uintptr_t)addr;
 }
 inline jlong addr_to_java(void* p) {
   assert(p == (void*)(uintptr_t)p, "must not be odd high bits");
   return (uintptr_t)p;
 }
 // Note: The VM's obj_field and related accessors use byte-scaled
 // ("unscaled") offsets, just as the unsafe methods do.
 // However, the method Unsafe.fieldOffset explicitly declines to
 // guarantee this.  The field offset values manipulated by the Java user
 // through the Unsafe API are opaque cookies that just happen to be byte
 // offsets.  We represent this state of affairs by passing the cookies
 // through conversion functions when going between the VM and the Unsafe API.
 // The conversion functions just happen to be no-ops at present.
 inline jlong field_offset_to_byte_offset(jlong field_offset) {
   return field_offset;
 }
 inline jlong field_offset_from_byte_offset(jlong byte_offset) {
   return byte_offset;
 }
 inline jint invocation_key_from_method_slot(jint slot) {
   return slot;
 }
 inline jint invocation_key_to_method_slot(jint key) {
   return key;
 }
 inline void* index_oop_from_field_offset_long(oop p, jlong field_offset) {
   jlong byte_offset = field_offset_to_byte_offset(field_offset);
 #ifdef ASSERT
   if (p != NULL) {
     assert(byte_offset >= 0 && byte_offset <= (jlong)MAX_OBJECT_SIZE, "sane offset");
     if (byte_offset == (jint)byte_offset) {
       void* ptr_plus_disp = (address)p + byte_offset;
       assert((void*)p->obj_field_addr<oop>((jint)byte_offset) == ptr_plus_disp,
              "raw [ptr+disp] must be consistent with oop::field_base");
     }
     jlong p_size = HeapWordSize * (jlong)(p->size());
     assert(byte_offset < p_size, err_msg("Unsafe access: offset " INT64_FORMAT " > object's size " INT64_FORMAT, byte_offset, p_size));
   }
 #endif
   if (sizeof(char*) == sizeof(jint))    // (this constant folds!)
     return (address)p + (jint) byte_offset;
   else
     return (address)p +        byte_offset;
 }
 // Externally callable versions:
 // (Use these in compiler intrinsics which emulate unsafe primitives.)
 jlong Unsafe_field_offset_to_byte_offset(jlong field_offset) {
   return field_offset;
 }
 jlong Unsafe_field_offset_from_byte_offset(jlong byte_offset) {
   return byte_offset;
 }
 jint Unsafe_invocation_key_from_method_slot(jint slot) {
   return invocation_key_from_method_slot(slot);
 }
 jint Unsafe_invocation_key_to_method_slot(jint key) {
   return invocation_key_to_method_slot(key);
 }
 ///// Data in the Java heap.
 #define GET_FIELD(obj, offset, type_name, v) \
   oop p = JNIHandles::resolve(obj); \
   type_name v = *(type_name*)index_oop_from_field_offset_long(p, offset)
 #define SET_FIELD(obj, offset, type_name, x) \
   oop p = JNIHandles::resolve(obj); \
   *(type_name*)index_oop_from_field_offset_long(p, offset) = x
 #define GET_FIELD_VOLATILE(obj, offset, type_name, v) \
   oop p = JNIHandles::resolve(obj); \
   if (support_IRIW_for_not_multiple_copy_atomic_cpu) { \
     OrderAccess::fence(); \
   } \
   volatile type_name v = OrderAccess::load_acquire((volatile type_name*)index_oop_from_field_offset_long(p, offset));
 #define SET_FIELD_VOLATILE(obj, offset, type_name, x) \
   oop p = JNIHandles::resolve(obj); \
   OrderAccess::release_store_fence((volatile type_name*)index_oop_from_field_offset_long(p, offset), x);
 // Macros for oops that check UseCompressedOops
 #define GET_OOP_FIELD(obj, offset, v) \
   oop p = JNIHandles::resolve(obj);   \
   oop v;                              \
   if (UseCompressedOops) {            \
     narrowOop n = *(narrowOop*)index_oop_from_field_offset_long(p, offset); \
     v = oopDesc::decode_heap_oop(n);                                \
   } else {                            \
     v = *(oop*)index_oop_from_field_offset_long(p, offset);                 \
   }
 // Get/SetObject must be special-cased, since it works with handles.
 // The xxx140 variants for backward compatibility do not allow a full-width offset.
 UNSAFE_ENTRY(jobject, Unsafe_GetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset))
   UnsafeWrapper("Unsafe_GetObject");
   if (obj == NULL)  THROW_0(vmSymbols::java_lang_NullPointerException());
   GET_OOP_FIELD(obj, offset, v)
   jobject ret = JNIHandles::make_local(env, v);
 #if INCLUDE_ALL_GCS
   // We could be accessing the referent field in a reference
   // object. If G1 is enabled then we need to register a non-null
   // referent with the SATB barrier.
   if (UseG1GC) {
     bool needs_barrier = false;
     if (ret != NULL) {
       if (offset == java_lang_ref_Reference::referent_offset) {
         oop o = JNIHandles::resolve_non_null(obj);
         Klass* k = o->klass();
         if (InstanceKlass::cast(k)->reference_type() != REF_NONE) {
           assert(InstanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity");
           needs_barrier = true;
         }
       }
     }
     if (needs_barrier) {
       oop referent = JNIHandles::resolve(ret);
       G1SATBCardTableModRefBS::enqueue(referent);
     }
   }
 #endif // INCLUDE_ALL_GCS
   return ret;
 UNSAFE_END
 UNSAFE_ENTRY(void, Unsafe_SetObject140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jobject x_h))
   UnsafeWrapper("Unsafe_SetObject");
   if (obj == NULL)  THROW(vmSymbols::java_lang_NullPointerException());
   oop x = JNIHandles::resolve(x_h);
   //SET_FIELD(obj, offset, oop, x);
   oop p = JNIHandles::resolve(obj);
   if (UseCompressedOops) {
     if (x != NULL) {
       // If there is a heap base pointer, we are obliged to emit a store barrier.
       oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
     } else {
       narrowOop n = oopDesc::encode_heap_oop_not_null(x);
       *(narrowOop*)index_oop_from_field_offset_long(p, offset) = n;
     }
   } else {
     if (x != NULL) {
       // If there is a heap base pointer, we are obliged to emit a store barrier.
       oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
     } else {
       *(oop*)index_oop_from_field_offset_long(p, offset) = x;
     }
   }
 UNSAFE_END
 // The normal variants allow a null base pointer with an arbitrary address.
 // But if the base pointer is non-null, the offset should make some sense.
 // That is, it should be in the range [0, MAX_OBJECT_SIZE].
 UNSAFE_ENTRY(jobject, Unsafe_GetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
   UnsafeWrapper("Unsafe_GetObject");
   GET_OOP_FIELD(obj, offset, v)
   jobject ret = JNIHandles::make_local(env, v);
 #if INCLUDE_ALL_GCS
   // We could be accessing the referent field in a reference
   // object. If G1 is enabled then we need to register non-null
   // referent with the SATB barrier.
   if (UseG1GC) {
     bool needs_barrier = false;
     if (ret != NULL) {
       if (offset == java_lang_ref_Reference::referent_offset && obj != NULL) {
         oop o = JNIHandles::resolve(obj);
         Klass* k = o->klass();
         if (InstanceKlass::cast(k)->reference_type() != REF_NONE) {
           assert(InstanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity");
           needs_barrier = true;
         }
       }
     }
     if (needs_barrier) {
       oop referent = JNIHandles::resolve(ret);
       G1SATBCardTableModRefBS::enqueue(referent);
     }
   }
 #endif // INCLUDE_ALL_GCS
   return ret;
 UNSAFE_END
 UNSAFE_ENTRY(void, Unsafe_SetObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
   UnsafeWrapper("Unsafe_SetObject");
   oop x = JNIHandles::resolve(x_h);
   oop p = JNIHandles::resolve(obj);
   if (UseCompressedOops) {
     oop_store((narrowOop*)index_oop_from_field_offset_long(p, offset), x);
   } else {
     oop_store((oop*)index_oop_from_field_offset_long(p, offset), x);
   }
 UNSAFE_END
 UNSAFE_ENTRY(jobject, Unsafe_GetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
   UnsafeWrapper("Unsafe_GetObjectVolatile");
   oop p = JNIHandles::resolve(obj);
   void* addr = index_oop_from_field_offset_long(p, offset);
   volatile oop v;
   if (UseCompressedOops) {
     volatile narrowOop n = *(volatile narrowOop*) addr;
     (void)const_cast<oop&>(v = oopDesc::decode_heap_oop(n));
   } else {
     (void)const_cast<oop&>(v = *(volatile oop*) addr);
   }
   OrderAccess::acquire();
   return JNIHandles::make_local(env, v);
 UNSAFE_END
 UNSAFE_ENTRY(void, Unsafe_SetObjectVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
   UnsafeWrapper("Unsafe_SetObjectVolatile");
   oop x = JNIHandles::resolve(x_h);
   oop p = JNIHandles::resolve(obj);
   void* addr = index_oop_from_field_offset_long(p, offset);
   OrderAccess::release();
   if (UseCompressedOops) {
     oop_store((narrowOop*)addr, x);
   } else {
     oop_store((oop*)addr, x);
   }
   OrderAccess::fence();
 UNSAFE_END
 #ifndef SUPPORTS_NATIVE_CX8
 // Keep old code for platforms which may not have atomic jlong (8 bytes) instructions
 // Volatile long versions must use locks if !VM_Version::supports_cx8().
 // support_cx8 is a surrogate for 'supports atomic long memory ops'.
 UNSAFE_ENTRY(jlong, Unsafe_GetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset))
   UnsafeWrapper("Unsafe_GetLongVolatile");
   {
     if (VM_Version::supports_cx8()) {
       GET_FIELD_VOLATILE(obj, offset, jlong, v);
       return v;
     }
     else {
       Handle p (THREAD, JNIHandles::resolve(obj));
       jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
       ObjectLocker ol(p, THREAD);
       jlong value = *addr;
       return value;
     }
   }
 UNSAFE_END
 UNSAFE_ENTRY(void, Unsafe_SetLongVolatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
   UnsafeWrapper("Unsafe_SetLongVolatile");
   {
     if (VM_Version::supports_cx8()) {
       SET_FIELD_VOLATILE(obj, offset, jlong, x);
     }
     else {
       Handle p (THREAD, JNIHandles::resolve(obj));
       jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
       ObjectLocker ol(p, THREAD);
       *addr = x;
     }
   }
 UNSAFE_END
 #endif // not SUPPORTS_NATIVE_CX8
 #define DEFINE_GETSETOOP(jboolean, Boolean) \
  \
 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset)) \
   UnsafeWrapper("Unsafe_Get"#Boolean); \
   if (obj == NULL)  THROW_0(vmSymbols::java_lang_NullPointerException()); \
   GET_FIELD(obj, offset, jboolean, v); \
   return v; \
 UNSAFE_END \
  \
 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##140(JNIEnv *env, jobject unsafe, jobject obj, jint offset, jboolean x)) \
   UnsafeWrapper("Unsafe_Set"#Boolean); \
   if (obj == NULL)  THROW(vmSymbols::java_lang_NullPointerException()); \
   SET_FIELD(obj, offset, jboolean, x); \
 UNSAFE_END \
  \
 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
   UnsafeWrapper("Unsafe_Get"#Boolean); \
   GET_FIELD(obj, offset, jboolean, v); \
   return v; \
 UNSAFE_END \
  \
 UNSAFE_ENTRY(void, Unsafe_Set##Boolean(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
   UnsafeWrapper("Unsafe_Set"#Boolean); \
   SET_FIELD(obj, offset, jboolean, x); \
 UNSAFE_END \
  \
 // END DEFINE_GETSETOOP.
 DEFINE_GETSETOOP(jboolean, Boolean)
 DEFINE_GETSETOOP(jbyte, Byte)
 DEFINE_GETSETOOP(jshort, Short);
 DEFINE_GETSETOOP(jchar, Char);
 DEFINE_GETSETOOP(jint, Int);
 DEFINE_GETSETOOP(jlong, Long);
 DEFINE_GETSETOOP(jfloat, Float);
 DEFINE_GETSETOOP(jdouble, Double);
 #undef DEFINE_GETSETOOP
 #define DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean) \
  \
 UNSAFE_ENTRY(jboolean, Unsafe_Get##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset)) \
   UnsafeWrapper("Unsafe_Get"#Boolean); \
   GET_FIELD_VOLATILE(obj, offset, jboolean, v); \
   return v; \
 UNSAFE_END \
  \
 UNSAFE_ENTRY(void, Unsafe_Set##Boolean##Volatile(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jboolean x)) \
   UnsafeWrapper("Unsafe_Set"#Boolean); \
   SET_FIELD_VOLATILE(obj, offset, jboolean, x); \
 UNSAFE_END \
  \
 // END DEFINE_GETSETOOP_VOLATILE.
 DEFINE_GETSETOOP_VOLATILE(jboolean, Boolean)
 DEFINE_GETSETOOP_VOLATILE(jbyte, Byte)
 DEFINE_GETSETOOP_VOLATILE(jshort, Short);
 DEFINE_GETSETOOP_VOLATILE(jchar, Char);
 DEFINE_GETSETOOP_VOLATILE(jint, Int);
 DEFINE_GETSETOOP_VOLATILE(jfloat, Float);
 DEFINE_GETSETOOP_VOLATILE(jdouble, Double);
 #ifdef SUPPORTS_NATIVE_CX8
 DEFINE_GETSETOOP_VOLATILE(jlong, Long);
 #endif
 #undef DEFINE_GETSETOOP_VOLATILE
 // The non-intrinsified versions of setOrdered just use setVolatile
 UNSAFE_ENTRY(void, Unsafe_SetOrderedInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint x))
   UnsafeWrapper("Unsafe_SetOrderedInt");
   SET_FIELD_VOLATILE(obj, offset, jint, x);
 UNSAFE_END
 UNSAFE_ENTRY(void, Unsafe_SetOrderedObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject x_h))
   UnsafeWrapper("Unsafe_SetOrderedObject");
   oop x = JNIHandles::resolve(x_h);
   oop p = JNIHandles::resolve(obj);
   void* addr = index_oop_from_field_offset_long(p, offset);
   OrderAccess::release();
   if (UseCompressedOops) {
     oop_store((narrowOop*)addr, x);
   } else {
     oop_store((oop*)addr, x);
   }
   OrderAccess::fence();
 UNSAFE_END
 UNSAFE_ENTRY(void, Unsafe_SetOrderedLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong x))
   UnsafeWrapper("Unsafe_SetOrderedLong");
 #ifdef SUPPORTS_NATIVE_CX8
   SET_FIELD_VOLATILE(obj, offset, jlong, x);
 #else
   // Keep old code for platforms which may not have atomic long (8 bytes) instructions
   {
     if (VM_Version::supports_cx8()) {
       SET_FIELD_VOLATILE(obj, offset, jlong, x);
     }
     else {
       Handle p (THREAD, JNIHandles::resolve(obj));
       jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
       ObjectLocker ol(p, THREAD);
       *addr = x;
     }
   }
 #endif
 UNSAFE_END
 UNSAFE_ENTRY(void, Unsafe_LoadFence(JNIEnv *env, jobject unsafe))
   UnsafeWrapper("Unsafe_LoadFence");
   OrderAccess::acquire();
 UNSAFE_END
 UNSAFE_ENTRY(void, Unsafe_StoreFence(JNIEnv *env, jobject unsafe))
   UnsafeWrapper("Unsafe_StoreFence");
   OrderAccess::release();
 UNSAFE_END
 UNSAFE_ENTRY(void, Unsafe_FullFence(JNIEnv *env, jobject unsafe))
   UnsafeWrapper("Unsafe_FullFence");
   OrderAccess::fence();
 UNSAFE_END
 ////// Data in the C heap.
 // Note:  These do not throw NullPointerException for bad pointers.
 // They just crash.  Only a oop base pointer can generate a NullPointerException.
 //
 #define DEFINE_GETSETNATIVE(java_type, Type, native_type) \
  \
 UNSAFE_ENTRY(java_type, Unsafe_GetNative##Type(JNIEnv *env, jobject unsafe, jlong addr)) \
   UnsafeWrapper("Unsafe_GetNative"#Type); \
   void* p = addr_from_java(addr); \
   JavaThread* t = JavaThread::current(); \
   t->set_doing_unsafe_access(true); \
   java_type x = *(volatile native_type*)p; \
   t->set_doing_unsafe_access(false); \
   return x; \
 UNSAFE_END \
  \
 UNSAFE_ENTRY(void, Unsafe_SetNative##Type(JNIEnv *env, jobject unsafe, jlong addr, java_type x)) \
   UnsafeWrapper("Unsafe_SetNative"#Type); \
   JavaThread* t = JavaThread::current(); \
   t->set_doing_unsafe_access(true); \
   void* p = addr_from_java(addr); \
   *(volatile native_type*)p = x; \
   t->set_doing_unsafe_access(false); \
 UNSAFE_END \
  \
 // END DEFINE_GETSETNATIVE.
 DEFINE_GETSETNATIVE(jbyte, Byte, signed char)
 DEFINE_GETSETNATIVE(jshort, Short, signed short);
 DEFINE_GETSETNATIVE(jchar, Char, unsigned short);
 DEFINE_GETSETNATIVE(jint, Int, jint);
 // no long -- handled specially
 DEFINE_GETSETNATIVE(jfloat, Float, float);
 DEFINE_GETSETNATIVE(jdouble, Double, double);
 #undef DEFINE_GETSETNATIVE
 UNSAFE_ENTRY(jlong, Unsafe_GetNativeLong(JNIEnv *env, jobject unsafe, jlong addr))
   UnsafeWrapper("Unsafe_GetNativeLong");
   JavaThread* t = JavaThread::current();
   // We do it this way to avoid problems with access to heap using 64
   // bit loads, as jlong in heap could be not 64-bit aligned, and on
   // some CPUs (SPARC) it leads to SIGBUS.
   t->set_doing_unsafe_access(true);
   void* p = addr_from_java(addr);
   jlong x;
   if (((intptr_t)p & 7) == 0) {
     // jlong is aligned, do a volatile access
     x = *(volatile jlong*)p;
   } else {
     jlong_accessor acc;
     acc.words[0] = ((volatile jint*)p)[0];
     acc.words[1] = ((volatile jint*)p)[1];
     x = acc.long_value;
   }
   t->set_doing_unsafe_access(false);
   return x;
 UNSAFE_END
 UNSAFE_ENTRY(void, Unsafe_SetNativeLong(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
   UnsafeWrapper("Unsafe_SetNativeLong");
   JavaThread* t = JavaThread::current();
   // see comment for Unsafe_GetNativeLong
   t->set_doing_unsafe_access(true);
   void* p = addr_from_java(addr);
   if (((intptr_t)p & 7) == 0) {
     // jlong is aligned, do a volatile access
     *(volatile jlong*)p = x;
   } else {
     jlong_accessor acc;
     acc.long_value = x;
     ((volatile jint*)p)[0] = acc.words[0];
     ((volatile jint*)p)[1] = acc.words[1];
   }
   t->set_doing_unsafe_access(false);
 UNSAFE_END
 UNSAFE_ENTRY(jlong, Unsafe_GetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr))
   UnsafeWrapper("Unsafe_GetNativeAddress");
   void* p = addr_from_java(addr);
   return addr_to_java(*(void**)p);
 UNSAFE_END
 UNSAFE_ENTRY(void, Unsafe_SetNativeAddress(JNIEnv *env, jobject unsafe, jlong addr, jlong x))
   UnsafeWrapper("Unsafe_SetNativeAddress");
   void* p = addr_from_java(addr);
   *(void**)p = addr_from_java(x);
 UNSAFE_END
 ////// Allocation requests
 UNSAFE_ENTRY(jobject, Unsafe_AllocateInstance(JNIEnv *env, jobject unsafe, jclass cls))
   UnsafeWrapper("Unsafe_AllocateInstance");
   {
     ThreadToNativeFromVM ttnfv(thread);
     return env->AllocObject(cls);
   }
 UNSAFE_END
 UNSAFE_ENTRY(jlong, Unsafe_AllocateMemory(JNIEnv *env, jobject unsafe, jlong size))
   UnsafeWrapper("Unsafe_AllocateMemory");
   size_t sz = (size_t)size;
   if (sz != (julong)size || size < 0) {
     THROW_0(vmSymbols::java_lang_IllegalArgumentException());
   }
   if (sz == 0) {
     return 0;
   }
   sz = round_to(sz, HeapWordSize);
   void* x = os::malloc(sz, mtInternal);
   if (x == NULL) {
     THROW_0(vmSymbols::java_lang_OutOfMemoryError());
   }
   //Copy::fill_to_words((HeapWord*)x, sz / HeapWordSize);
   return addr_to_java(x);
 UNSAFE_END
 UNSAFE_ENTRY(jlong, Unsafe_ReallocateMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size))
   UnsafeWrapper("Unsafe_ReallocateMemory");
   void* p = addr_from_java(addr);
   size_t sz = (size_t)size;
   if (sz != (julong)size || size < 0) {
     THROW_0(vmSymbols::java_lang_IllegalArgumentException());
   }
   if (sz == 0) {
     os::free(p);
     return 0;
   }
   sz = round_to(sz, HeapWordSize);
   void* x = (p == NULL) ? os::malloc(sz, mtInternal) : os::realloc(p, sz, mtInternal);
   if (x == NULL) {
     THROW_0(vmSymbols::java_lang_OutOfMemoryError());
   }
   return addr_to_java(x);
 UNSAFE_END
 UNSAFE_ENTRY(void, Unsafe_FreeMemory(JNIEnv *env, jobject unsafe, jlong addr))
   UnsafeWrapper("Unsafe_FreeMemory");
   void* p = addr_from_java(addr);
   if (p == NULL) {
     return;
   }
   os::free(p);
 UNSAFE_END
 UNSAFE_ENTRY(void, Unsafe_SetMemory(JNIEnv *env, jobject unsafe, jlong addr, jlong size, jbyte value))
   UnsafeWrapper("Unsafe_SetMemory");
   size_t sz = (size_t)size;
   if (sz != (julong)size || size < 0) {
     THROW(vmSymbols::java_lang_IllegalArgumentException());
   }
   char* p = (char*) addr_from_java(addr);
   Copy::fill_to_memory_atomic(p, sz, value);
 UNSAFE_END
 UNSAFE_ENTRY(void, Unsafe_SetMemory2(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong size, jbyte value))
   UnsafeWrapper("Unsafe_SetMemory");
   size_t sz = (size_t)size;
   if (sz != (julong)size || size < 0) {
     THROW(vmSymbols::java_lang_IllegalArgumentException());
   }
   oop base = JNIHandles::resolve(obj);
   void* p = index_oop_from_field_offset_long(base, offset);
   Copy::fill_to_memory_atomic(p, sz, value);
 UNSAFE_END
 UNSAFE_ENTRY(void, Unsafe_CopyMemory(JNIEnv *env, jobject unsafe, jlong srcAddr, jlong dstAddr, jlong size))
   UnsafeWrapper("Unsafe_CopyMemory");
   if (size == 0) {
     return;
   }
   size_t sz = (size_t)size;
   if (sz != (julong)size || size < 0) {
     THROW(vmSymbols::java_lang_IllegalArgumentException());
   }
   void* src = addr_from_java(srcAddr);
   void* dst = addr_from_java(dstAddr);
   Copy::conjoint_memory_atomic(src, dst, sz);
 UNSAFE_END
 UNSAFE_ENTRY(void, Unsafe_CopyMemory2(JNIEnv *env, jobject unsafe, jobject srcObj, jlong srcOffset, jobject dstObj, jlong dstOffset, jlong size))
   UnsafeWrapper("Unsafe_CopyMemory");
   if (size == 0) {
     return;
   }
   size_t sz = (size_t)size;
   if (sz != (julong)size || size < 0) {
     THROW(vmSymbols::java_lang_IllegalArgumentException());
   }
   oop srcp = JNIHandles::resolve(srcObj);
   oop dstp = JNIHandles::resolve(dstObj);
   if (dstp != NULL && !dstp->is_typeArray()) {
     // NYI:  This works only for non-oop arrays at present.
     // Generalizing it would be reasonable, but requires card marking.
     // Also, autoboxing a Long from 0L in copyMemory(x,y, 0L,z, n) would be bad.
     THROW(vmSymbols::java_lang_IllegalArgumentException());
   }
   void* src = index_oop_from_field_offset_long(srcp, srcOffset);
   void* dst = index_oop_from_field_offset_long(dstp, dstOffset);
   Copy::conjoint_memory_atomic(src, dst, sz);
 UNSAFE_END
 ////// Random queries
 // See comment at file start about UNSAFE_LEAF
 //UNSAFE_LEAF(jint, Unsafe_AddressSize())
 UNSAFE_ENTRY(jint, Unsafe_AddressSize(JNIEnv *env, jobject unsafe))
   UnsafeWrapper("Unsafe_AddressSize");
   return sizeof(void*);
 UNSAFE_END
 // See comment at file start about UNSAFE_LEAF
 //UNSAFE_LEAF(jint, Unsafe_PageSize())
 UNSAFE_ENTRY(jint, Unsafe_PageSize(JNIEnv *env, jobject unsafe))
   UnsafeWrapper("Unsafe_PageSize");
   return os::vm_page_size();
 UNSAFE_END
 jint find_field_offset(jobject field, int must_be_static, TRAPS) {
   if (field == NULL) {
     THROW_0(vmSymbols::java_lang_NullPointerException());
   }
   oop reflected   = JNIHandles::resolve_non_null(field);
   oop mirror      = java_lang_reflect_Field::clazz(reflected);
   Klass* k      = java_lang_Class::as_Klass(mirror);
   int slot        = java_lang_reflect_Field::slot(reflected);
   int modifiers   = java_lang_reflect_Field::modifiers(reflected);
   if (must_be_static >= 0) {
     int really_is_static = ((modifiers & JVM_ACC_STATIC) != 0);
     if (must_be_static != really_is_static) {
       THROW_0(vmSymbols::java_lang_IllegalArgumentException());
     }
   }
   int offset = InstanceKlass::cast(k)->field_offset(slot);
   return field_offset_from_byte_offset(offset);
 }
 UNSAFE_ENTRY(jlong, Unsafe_ObjectFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
   UnsafeWrapper("Unsafe_ObjectFieldOffset");
   return find_field_offset(field, 0, THREAD);
 UNSAFE_END
 UNSAFE_ENTRY(jlong, Unsafe_StaticFieldOffset(JNIEnv *env, jobject unsafe, jobject field))
   UnsafeWrapper("Unsafe_StaticFieldOffset");
   return find_field_offset(field, 1, THREAD);
 UNSAFE_END
 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromField(JNIEnv *env, jobject unsafe, jobject field))
   UnsafeWrapper("Unsafe_StaticFieldBase");
   // Note:  In this VM implementation, a field address is always a short
   // offset from the base of a a klass metaobject.  Thus, the full dynamic
   // range of the return type is never used.  However, some implementations
   // might put the static field inside an array shared by many classes,
   // or even at a fixed address, in which case the address could be quite
   // large.  In that last case, this function would return NULL, since
   // the address would operate alone, without any base pointer.
   if (field == NULL)  THROW_0(vmSymbols::java_lang_NullPointerException());
   oop reflected   = JNIHandles::resolve_non_null(field);
   oop mirror      = java_lang_reflect_Field::clazz(reflected);
   int modifiers   = java_lang_reflect_Field::modifiers(reflected);
   if ((modifiers & JVM_ACC_STATIC) == 0) {
     THROW_0(vmSymbols::java_lang_IllegalArgumentException());
   }
   return JNIHandles::make_local(env, mirror);
 UNSAFE_END
 //@deprecated
 UNSAFE_ENTRY(jint, Unsafe_FieldOffset(JNIEnv *env, jobject unsafe, jobject field))
   UnsafeWrapper("Unsafe_FieldOffset");
   // tries (but fails) to be polymorphic between static and non-static:
   jlong offset = find_field_offset(field, -1, THREAD);
   guarantee(offset == (jint)offset, "offset fits in 32 bits");
   return (jint)offset;
 UNSAFE_END
 //@deprecated
 UNSAFE_ENTRY(jobject, Unsafe_StaticFieldBaseFromClass(JNIEnv *env, jobject unsafe, jobject clazz))
   UnsafeWrapper("Unsafe_StaticFieldBase");
   if (clazz == NULL) {
     THROW_0(vmSymbols::java_lang_NullPointerException());
   }
   return JNIHandles::make_local(env, JNIHandles::resolve_non_null(clazz));
 UNSAFE_END
 UNSAFE_ENTRY(void, Unsafe_EnsureClassInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) {
   UnsafeWrapper("Unsafe_EnsureClassInitialized");
   if (clazz == NULL) {
     THROW(vmSymbols::java_lang_NullPointerException());
   }
   oop mirror = JNIHandles::resolve_non_null(clazz);
   Klass* klass = java_lang_Class::as_Klass(mirror);
   if (klass != NULL && klass->should_be_initialized()) {
     InstanceKlass* k = InstanceKlass::cast(klass);
     k->initialize(CHECK);
   }
 }
 UNSAFE_END
 UNSAFE_ENTRY(jboolean, Unsafe_ShouldBeInitialized(JNIEnv *env, jobject unsafe, jobject clazz)) {
   UnsafeWrapper("Unsafe_ShouldBeInitialized");
   if (clazz == NULL) {
     THROW_(vmSymbols::java_lang_NullPointerException(), false);
   }
   oop mirror = JNIHandles::resolve_non_null(clazz);
   Klass* klass = java_lang_Class::as_Klass(mirror);
   if (klass != NULL && klass->should_be_initialized()) {
     return true;
   }
   return false;
 }
 UNSAFE_END
 static void getBaseAndScale(int& base, int& scale, jclass acls, TRAPS) {
   if (acls == NULL) {
     THROW(vmSymbols::java_lang_NullPointerException());
   }
   oop      mirror = JNIHandles::resolve_non_null(acls);
   Klass* k      = java_lang_Class::as_Klass(mirror);
   if (k == NULL || !k->oop_is_array()) {
     THROW(vmSymbols::java_lang_InvalidClassException());
   } else if (k->oop_is_objArray()) {
     base  = arrayOopDesc::base_offset_in_bytes(T_OBJECT);
     scale = heapOopSize;
   } else if (k->oop_is_typeArray()) {
     TypeArrayKlass* tak = TypeArrayKlass::cast(k);
     base  = tak->array_header_in_bytes();
     assert(base == arrayOopDesc::base_offset_in_bytes(tak->element_type()), "array_header_size semantics ok");
     scale = (1 << tak->log2_element_size());
   } else {
     ShouldNotReachHere();
   }
 }
 UNSAFE_ENTRY(jint, Unsafe_ArrayBaseOffset(JNIEnv *env, jobject unsafe, jclass acls))
   UnsafeWrapper("Unsafe_ArrayBaseOffset");
   int base, scale;
   getBaseAndScale(base, scale, acls, CHECK_0);
   return field_offset_from_byte_offset(base);
 UNSAFE_END
 UNSAFE_ENTRY(jint, Unsafe_ArrayIndexScale(JNIEnv *env, jobject unsafe, jclass acls))
   UnsafeWrapper("Unsafe_ArrayIndexScale");
   int base, scale;
   getBaseAndScale(base, scale, acls, CHECK_0);
   // This VM packs both fields and array elements down to the byte.
   // But watch out:  If this changes, so that array references for
   // a given primitive type (say, T_BOOLEAN) use different memory units
   // than fields, this method MUST return zero for such arrays.
   // For example, the VM used to store sub-word sized fields in full
   // words in the object layout, so that accessors like getByte(Object,int)
   // did not really do what one might expect for arrays.  Therefore,
   // this function used to report a zero scale factor, so that the user
   // would know not to attempt to access sub-word array elements.
   // // Code for unpacked fields:
   // if (scale < wordSize)  return 0;
   // The following allows for a pretty general fieldOffset cookie scheme,
   // but requires it to be linear in byte offset.
   return field_offset_from_byte_offset(scale) - field_offset_from_byte_offset(0);
 UNSAFE_END
 static inline void throw_new(JNIEnv *env, const char *ename) {
   char buf[100];
   strcpy(buf, "java/lang/");
   strcat(buf, ename);
   jclass cls = env->FindClass(buf);
   if (env->ExceptionCheck()) {
     env->ExceptionClear();
     tty->print_cr("Unsafe: cannot throw %s because FindClass has failed", buf);
     return;
   }
   char* msg = NULL;
   env->ThrowNew(cls, msg);
 }
 static jclass Unsafe_DefineClass_impl(JNIEnv *env, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd) {
   {
     // Code lifted from JDK 1.3 ClassLoader.c
     jbyte *body;
     char *utfName;
     jclass result = 0;
     char buf[128];
     if (UsePerfData) {
       ClassLoader::unsafe_defineClassCallCounter()->inc();
     }
     if (data == NULL) {
         throw_new(env, "NullPointerException");
         return 0;
     }
     /* Work around 4153825. malloc crashes on Solaris when passed a
      * negative size.
      */
     if (length < 0) {
         throw_new(env, "ArrayIndexOutOfBoundsException");
         return 0;
     }
     body = NEW_C_HEAP_ARRAY(jbyte, length, mtInternal);
     if (body == 0) {
         throw_new(env, "OutOfMemoryError");
         return 0;
     }
     env->GetByteArrayRegion(data, offset, length, body);
     if (env->ExceptionOccurred())
         goto free_body;
     if (name != NULL) {
         uint len = env->GetStringUTFLength(name);
         int unicode_len = env->GetStringLength(name);
         if (len >= sizeof(buf)) {
             utfName = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
             if (utfName == NULL) {
                 throw_new(env, "OutOfMemoryError");
                 goto free_body;
             }
         } else {
             utfName = buf;
         }
         env->GetStringUTFRegion(name, 0, unicode_len, utfName);
         //VerifyFixClassname(utfName);
         for (uint i = 0; i < len; i++) {
           if (utfName[i] == '.')   utfName[i] = '/';
         }
     } else {
         utfName = NULL;
     }
     result = JVM_DefineClass(env, utfName, loader, body, length, pd);
     if (utfName && utfName != buf)
         FREE_C_HEAP_ARRAY(char, utfName, mtInternal);
  free_body:
     FREE_C_HEAP_ARRAY(jbyte, body, mtInternal);
     return result;
   }
 }
 UNSAFE_ENTRY(jclass, Unsafe_DefineClass(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length, jobject loader, jobject pd))
   UnsafeWrapper("Unsafe_DefineClass");
   {
     ThreadToNativeFromVM ttnfv(thread);
     return Unsafe_DefineClass_impl(env, name, data, offset, length, loader, pd);
   }
 UNSAFE_END
 static jobject get_class_loader(JNIEnv* env, jclass cls) {
   if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
     return NULL;
   }
   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
   oop loader = k->class_loader();
   return JNIHandles::make_local(env, loader);
 }
 UNSAFE_ENTRY(jclass, Unsafe_DefineClass0(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length))
   UnsafeWrapper("Unsafe_DefineClass");
   {
     ThreadToNativeFromVM ttnfv(thread);
     int depthFromDefineClass0 = 1;
     jclass  caller = JVM_GetCallerClass(env, depthFromDefineClass0);
     jobject loader = (caller == NULL) ? NULL : get_class_loader(env, caller);
     jobject pd     = (caller == NULL) ? NULL : JVM_GetProtectionDomain(env, caller);
     return Unsafe_DefineClass_impl(env, name, data, offset, length, loader, pd);
   }
 UNSAFE_END
 #define DAC_Args CLS"[B["OBJ
 // define a class but do not make it known to the class loader or system dictionary
 // - host_class:  supplies context for linkage, access control, protection domain, and class loader
 // - data:  bytes of a class file, a raw memory address (length gives the number of bytes)
 // - cp_patches:  where non-null entries exist, they replace corresponding CP entries in data
 // When you load an anonymous class U, it works as if you changed its name just before loading,
 // to a name that you will never use again.  Since the name is lost, no other class can directly
 // link to any member of U.  Just after U is loaded, the only way to use it is reflectively,
 // through java.lang.Class methods like Class.newInstance.
 // Access checks for linkage sites within U continue to follow the same rules as for named classes.
 // The package of an anonymous class is given by the package qualifier on the name under which it was loaded.
 // An anonymous class also has special privileges to access any member of its host class.
 // This is the main reason why this loading operation is unsafe.  The purpose of this is to
 // allow language implementations to simulate "open classes"; a host class in effect gets
 // new code when an anonymous class is loaded alongside it.  A less convenient but more
 // standard way to do this is with reflection, which can also be set to ignore access
 // restrictions.
 // Access into an anonymous class is possible only through reflection.  Therefore, there
 // are no special access rules for calling into an anonymous class.  The relaxed access
 // rule for the host class is applied in the opposite direction:  A host class reflectively
 // access one of its anonymous classes.
 // If you load the same bytecodes twice, you get two different classes.  You can reload
 // the same bytecodes with or without varying CP patches.
 // By using the CP patching array, you can have a new anonymous class U2 refer to an older one U1.
 // The bytecodes for U2 should refer to U1 by a symbolic name (doesn't matter what the name is).
 // The CONSTANT_Class entry for that name can be patched to refer directly to U1.
 // This allows, for example, U2 to use U1 as a superclass or super-interface, or as
 // an outer class (so that U2 is an anonymous inner class of anonymous U1).
 // It is not possible for a named class, or an older anonymous class, to refer by
 // name (via its CP) to a newer anonymous class.
 // CP patching may also be used to modify (i.e., hack) the names of methods, classes,
 // or type descriptors used in the loaded anonymous class.
 // Finally, CP patching may be used to introduce "live" objects into the constant pool,
 // instead of "dead" strings.  A compiled statement like println((Object)"hello") can
 // be changed to println(greeting), where greeting is an arbitrary object created before
 // the anonymous class is loaded.  This is useful in dynamic languages, in which
 // various kinds of metaobjects must be introduced as constants into bytecode.
 // Note the cast (Object), which tells the verifier to expect an arbitrary object,
 // not just a literal string.  For such ldc instructions, the verifier uses the
 // type Object instead of String, if the loaded constant is not in fact a String.
 static instanceKlassHandle
 Unsafe_DefineAnonymousClass_impl(JNIEnv *env,
                                  jclass host_class, jbyteArray data, jobjectArray cp_patches_jh,
                                  HeapWord* *temp_alloc,
                                  TRAPS) {
   if (UsePerfData) {
     ClassLoader::unsafe_defineClassCallCounter()->inc();
   }
   if (data == NULL) {
     THROW_0(vmSymbols::java_lang_NullPointerException());
   }
   jint length = typeArrayOop(JNIHandles::resolve_non_null(data))->length();
   jint word_length = (length + sizeof(HeapWord)-1) / sizeof(HeapWord);
   HeapWord* body = NEW_C_HEAP_ARRAY(HeapWord, word_length, mtInternal);
   if (body == NULL) {
     THROW_0(vmSymbols::java_lang_OutOfMemoryError());
   }
   // caller responsible to free it:
   (*temp_alloc) = body;
   {
     jbyte* array_base = typeArrayOop(JNIHandles::resolve_non_null(data))->byte_at_addr(0);
     Copy::conjoint_words((HeapWord*) array_base, body, word_length);
   }
   u1* class_bytes = (u1*) body;
   int class_bytes_length = (int) length;
   if (class_bytes_length < 0)  class_bytes_length = 0;
   if (class_bytes == NULL
       || host_class == NULL
       || length != class_bytes_length)
     THROW_0(vmSymbols::java_lang_IllegalArgumentException());
   objArrayHandle cp_patches_h;
   if (cp_patches_jh != NULL) {
     oop p = JNIHandles::resolve_non_null(cp_patches_jh);
     if (!p->is_objArray())
       THROW_0(vmSymbols::java_lang_IllegalArgumentException());
     cp_patches_h = objArrayHandle(THREAD, (objArrayOop)p);
   }
   KlassHandle host_klass(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(host_class)));
   const char* host_source = host_klass->external_name();
   Handle      host_loader(THREAD, host_klass->class_loader());
   Handle      host_domain(THREAD, host_klass->protection_domain());
   GrowableArray<Handle>* cp_patches = NULL;
   if (cp_patches_h.not_null()) {
     int alen = cp_patches_h->length();
     for (int i = alen-1; i >= 0; i--) {
       oop p = cp_patches_h->obj_at(i);
       if (p != NULL) {
         Handle patch(THREAD, p);
         if (cp_patches == NULL)
           cp_patches = new GrowableArray<Handle>(i+1, i+1, Handle());
         cp_patches->at_put(i, patch);
       }
     }
   }
   ClassFileStream st(class_bytes, class_bytes_length, (char*) host_source);
   instanceKlassHandle anon_klass;
   {
     Symbol* no_class_name = NULL;
     Klass* anonk = SystemDictionary::parse_stream(no_class_name,
                                                     host_loader, host_domain,
                                                     &st, host_klass, cp_patches,
                                                     CHECK_NULL);
     if (anonk == NULL)  return NULL;
     anon_klass = instanceKlassHandle(THREAD, anonk);
   }
   return anon_klass;
 }
 UNSAFE_ENTRY(jclass, Unsafe_DefineAnonymousClass(JNIEnv *env, jobject unsafe, jclass host_class, jbyteArray data, jobjectArray cp_patches_jh))
 {
   instanceKlassHandle anon_klass;
   jobject res_jh = NULL;
   UnsafeWrapper("Unsafe_DefineAnonymousClass");
   ResourceMark rm(THREAD);
   HeapWord* temp_alloc = NULL;
   anon_klass = Unsafe_DefineAnonymousClass_impl(env, host_class, data,
                                                 cp_patches_jh,
                                                    &temp_alloc, THREAD);
   if (anon_klass() != NULL)
     res_jh = JNIHandles::make_local(env, anon_klass->java_mirror());
   // try/finally clause:
   if (temp_alloc != NULL) {
     FREE_C_HEAP_ARRAY(HeapWord, temp_alloc, mtInternal);
   }
   // The anonymous class loader data has been artificially been kept alive to
   // this point.   The mirror and any instances of this class have to keep
   // it alive afterwards.
   if (anon_klass() != NULL) {
     anon_klass->class_loader_data()->set_keep_alive(false);
   }
   // let caller initialize it as needed...
   return (jclass) res_jh;
 }
 UNSAFE_END
 UNSAFE_ENTRY(void, Unsafe_MonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
   UnsafeWrapper("Unsafe_MonitorEnter");
   {
     if (jobj == NULL) {
       THROW(vmSymbols::java_lang_NullPointerException());
     }
     Handle obj(thread, JNIHandles::resolve_non_null(jobj));
     ObjectSynchronizer::jni_enter(obj, CHECK);
   }
 UNSAFE_END
 UNSAFE_ENTRY(jboolean, Unsafe_TryMonitorEnter(JNIEnv *env, jobject unsafe, jobject jobj))
   UnsafeWrapper("Unsafe_TryMonitorEnter");
   {
     if (jobj == NULL) {
       THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
     }
     Handle obj(thread, JNIHandles::resolve_non_null(jobj));
     bool res = ObjectSynchronizer::jni_try_enter(obj, CHECK_0);
     return (res ? JNI_TRUE : JNI_FALSE);
   }
 UNSAFE_END
 UNSAFE_ENTRY(void, Unsafe_MonitorExit(JNIEnv *env, jobject unsafe, jobject jobj))
   UnsafeWrapper("Unsafe_MonitorExit");
   {
     if (jobj == NULL) {
       THROW(vmSymbols::java_lang_NullPointerException());
     }
     Handle obj(THREAD, JNIHandles::resolve_non_null(jobj));
     ObjectSynchronizer::jni_exit(obj(), CHECK);
   }
 UNSAFE_END
 UNSAFE_ENTRY(void, Unsafe_ThrowException(JNIEnv *env, jobject unsafe, jthrowable thr))
   UnsafeWrapper("Unsafe_ThrowException");
   {
     ThreadToNativeFromVM ttnfv(thread);
     env->Throw(thr);
   }
 UNSAFE_END
 // JSR166 ------------------------------------------------------------------
 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapObject(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jobject e_h, jobject x_h))
   UnsafeWrapper("Unsafe_CompareAndSwapObject");
   oop x = JNIHandles::resolve(x_h);
   oop e = JNIHandles::resolve(e_h);
   oop p = JNIHandles::resolve(obj);
   HeapWord* addr = (HeapWord *)index_oop_from_field_offset_long(p, offset);
   oop res = oopDesc::atomic_compare_exchange_oop(x, addr, e, true);
   jboolean success  = (res == e);
   if (success)
     update_barrier_set((void*)addr, x);
   return success;
 UNSAFE_END
 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapInt(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jint e, jint x))
   UnsafeWrapper("Unsafe_CompareAndSwapInt");
   oop p = JNIHandles::resolve(obj);
   jint* addr = (jint *) index_oop_from_field_offset_long(p, offset);
   return (jint)(Atomic::cmpxchg(x, addr, e)) == e;
 UNSAFE_END
 UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapLong(JNIEnv *env, jobject unsafe, jobject obj, jlong offset, jlong e, jlong x))
   UnsafeWrapper("Unsafe_CompareAndSwapLong");
   Handle p (THREAD, JNIHandles::resolve(obj));
   jlong* addr = (jlong*)(index_oop_from_field_offset_long(p(), offset));
   if (VM_Version::supports_cx8())
     return (jlong)(Atomic::cmpxchg(x, addr, e)) == e;
   else {
     jboolean success = false;
     ObjectLocker ol(p, THREAD);
     if (*addr == e) { *addr = x; success = true; }
     return success;
   }
 UNSAFE_END
 UNSAFE_ENTRY(void, Unsafe_Park(JNIEnv *env, jobject unsafe, jboolean isAbsolute, jlong time))
   UnsafeWrapper("Unsafe_Park");
   EventThreadPark event;
 #ifndef USDT2
   HS_DTRACE_PROBE3(hotspot, thread__park__begin, thread->parker(), (int) isAbsolute, time);
 #else /* USDT2 */
    HOTSPOT_THREAD_PARK_BEGIN(
                              (uintptr_t) thread->parker(), (int) isAbsolute, time);
 #endif /* USDT2 */
   JavaThreadParkedState jtps(thread, time != 0);
   thread->parker()->park(isAbsolute != 0, time);
 #ifndef USDT2
   HS_DTRACE_PROBE1(hotspot, thread__park__end, thread->parker());
 #else /* USDT2 */
   HOTSPOT_THREAD_PARK_END(
                           (uintptr_t) thread->parker());
 #endif /* USDT2 */
   if (event.should_commit()) {
     oop obj = thread->current_park_blocker();
     event.set_klass((obj != NULL) ? obj->klass() : NULL);
     event.set_timeout(time);
     event.set_address((obj != NULL) ? (TYPE_ADDRESS) cast_from_oop<uintptr_t>(obj) : 0);
     event.commit();
   }
 UNSAFE_END
 UNSAFE_ENTRY(void, Unsafe_Unpark(JNIEnv *env, jobject unsafe, jobject jthread))
   UnsafeWrapper("Unsafe_Unpark");
   Parker* p = NULL;
   if (jthread != NULL) {
     oop java_thread = JNIHandles::resolve_non_null(jthread);
     if (java_thread != NULL) {
       jlong lp = java_lang_Thread::park_event(java_thread);
       if (lp != 0) {
         // This cast is OK even though the jlong might have been read
         // non-atomically on 32bit systems, since there, one word will
         // always be zero anyway and the value set is always the same
         p = (Parker*)addr_from_java(lp);
       } else {
         // Grab lock if apparently null or using older version of library
         MutexLocker mu(Threads_lock);
         java_thread = JNIHandles::resolve_non_null(jthread);
         if (java_thread != NULL) {
           JavaThread* thr = java_lang_Thread::thread(java_thread);
           if (thr != NULL) {
             p = thr->parker();
             if (p != NULL) { // Bind to Java thread for next time.
               java_lang_Thread::set_park_event(java_thread, addr_to_java(p));
             }
           }
         }
       }
     }
   }
   if (p != NULL) {
 #ifndef USDT2
     HS_DTRACE_PROBE1(hotspot, thread__unpark, p);
 #else /* USDT2 */
     HOTSPOT_THREAD_UNPARK(
                           (uintptr_t) p);
 #endif /* USDT2 */
     p->unpark();
   }
 UNSAFE_END
 UNSAFE_ENTRY(jint, Unsafe_Loadavg(JNIEnv *env, jobject unsafe, jdoubleArray loadavg, jint nelem))
   UnsafeWrapper("Unsafe_Loadavg");
   const int max_nelem = 3;
   double la[max_nelem];
   jint ret;
   typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(loadavg));
   assert(a->is_typeArray(), "must be type array");
   if (nelem < 0 || nelem > max_nelem || a->length() < nelem) {
     ThreadToNativeFromVM ttnfv(thread);
     throw_new(env, "ArrayIndexOutOfBoundsException");
     return -1;
   }
   ret = os::loadavg(la, nelem);
   if (ret == -1) return -1;
   // if successful, ret is the number of samples actually retrieved.
   assert(ret >= 0 && ret <= max_nelem, "Unexpected loadavg return value");
   switch(ret) {
     case 3: a->double_at_put(2, (jdouble)la[2]); // fall through
     case 2: a->double_at_put(1, (jdouble)la[1]); // fall through
     case 1: a->double_at_put(0, (jdouble)la[0]); break;
   }
   return ret;
 UNSAFE_END
 UNSAFE_ENTRY(void, Unsafe_PrefetchRead(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
   UnsafeWrapper("Unsafe_PrefetchRead");
   oop p = JNIHandles::resolve(obj);
   void* addr = index_oop_from_field_offset_long(p, 0);
   Prefetch::read(addr, (intx)offset);
 UNSAFE_END
 UNSAFE_ENTRY(void, Unsafe_PrefetchWrite(JNIEnv* env, jclass ignored, jobject obj, jlong offset))
   UnsafeWrapper("Unsafe_PrefetchWrite");
   oop p = JNIHandles::resolve(obj);
   void* addr = index_oop_from_field_offset_long(p, 0);
   Prefetch::write(addr, (intx)offset);
 UNSAFE_END
 /// JVM_RegisterUnsafeMethods
 #define ADR "J"
 #define LANG "Ljava/lang/"
 #define OBJ LANG"Object;"
 #define CLS LANG"Class;"
 #define CTR LANG"reflect/Constructor;"
 #define FLD LANG"reflect/Field;"
 #define MTH LANG"reflect/Method;"
 #define THR LANG"Throwable;"
 #define DC0_Args LANG"String;[BII"
 #define DC_Args  DC0_Args LANG"ClassLoader;" "Ljava/security/ProtectionDomain;"
 #define CC (char*)  /*cast a literal from (const char*)*/
 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
 // define deprecated accessors for compabitility with 1.4.0
 #define DECLARE_GETSETOOP_140(Boolean, Z) \
     {CC"get"#Boolean,      CC"("OBJ"I)"#Z,      FN_PTR(Unsafe_Get##Boolean##140)}, \
     {CC"put"#Boolean,      CC"("OBJ"I"#Z")V",   FN_PTR(Unsafe_Set##Boolean##140)}
 // Note:  In 1.4.1, getObject and kin take both int and long offsets.
 #define DECLARE_GETSETOOP_141(Boolean, Z) \
     {CC"get"#Boolean,      CC"("OBJ"J)"#Z,      FN_PTR(Unsafe_Get##Boolean)}, \
     {CC"put"#Boolean,      CC"("OBJ"J"#Z")V",   FN_PTR(Unsafe_Set##Boolean)}
 // Note:  In 1.5.0, there are volatile versions too
 #define DECLARE_GETSETOOP(Boolean, Z) \
     {CC"get"#Boolean,      CC"("OBJ"J)"#Z,      FN_PTR(Unsafe_Get##Boolean)}, \
     {CC"put"#Boolean,      CC"("OBJ"J"#Z")V",   FN_PTR(Unsafe_Set##Boolean)}, \
     {CC"get"#Boolean"Volatile",      CC"("OBJ"J)"#Z,      FN_PTR(Unsafe_Get##Boolean##Volatile)}, \
     {CC"put"#Boolean"Volatile",      CC"("OBJ"J"#Z")V",   FN_PTR(Unsafe_Set##Boolean##Volatile)}
 #define DECLARE_GETSETNATIVE(Byte, B) \
     {CC"get"#Byte,         CC"("ADR")"#B,       FN_PTR(Unsafe_GetNative##Byte)}, \
     {CC"put"#Byte,         CC"("ADR#B")V",      FN_PTR(Unsafe_SetNative##Byte)}
 // These are the methods for 1.4.0
 static JNINativeMethod methods_140[] = {
     {CC"getObject",        CC"("OBJ"I)"OBJ"",   FN_PTR(Unsafe_GetObject140)},
     {CC"putObject",        CC"("OBJ"I"OBJ")V",  FN_PTR(Unsafe_SetObject140)},
     DECLARE_GETSETOOP_140(Boolean, Z),
     DECLARE_GETSETOOP_140(Byte, B),
     DECLARE_GETSETOOP_140(Short, S),
     DECLARE_GETSETOOP_140(Char, C),
     DECLARE_GETSETOOP_140(Int, I),
     DECLARE_GETSETOOP_140(Long, J),
     DECLARE_GETSETOOP_140(Float, F),
     DECLARE_GETSETOOP_140(Double, D),
     DECLARE_GETSETNATIVE(Byte, B),
     DECLARE_GETSETNATIVE(Short, S),
     DECLARE_GETSETNATIVE(Char, C),
     DECLARE_GETSETNATIVE(Int, I),
     DECLARE_GETSETNATIVE(Long, J),
     DECLARE_GETSETNATIVE(Float, F),
     DECLARE_GETSETNATIVE(Double, D),
     {CC"getAddress",         CC"("ADR")"ADR,             FN_PTR(Unsafe_GetNativeAddress)},
     {CC"putAddress",         CC"("ADR""ADR")V",          FN_PTR(Unsafe_SetNativeAddress)},
     {CC"allocateMemory",     CC"(J)"ADR,                 FN_PTR(Unsafe_AllocateMemory)},
     {CC"reallocateMemory",   CC"("ADR"J)"ADR,            FN_PTR(Unsafe_ReallocateMemory)},
     {CC"freeMemory",         CC"("ADR")V",               FN_PTR(Unsafe_FreeMemory)},
     {CC"fieldOffset",        CC"("FLD")I",               FN_PTR(Unsafe_FieldOffset)},
     {CC"staticFieldBase",    CC"("CLS")"OBJ,             FN_PTR(Unsafe_StaticFieldBaseFromClass)},
     {CC"ensureClassInitialized",CC"("CLS")V",            FN_PTR(Unsafe_EnsureClassInitialized)},
     {CC"arrayBaseOffset",    CC"("CLS")I",               FN_PTR(Unsafe_ArrayBaseOffset)},
     {CC"arrayIndexScale",    CC"("CLS")I",               FN_PTR(Unsafe_ArrayIndexScale)},
     {CC"addressSize",        CC"()I",                    FN_PTR(Unsafe_AddressSize)},
     {CC"pageSize",           CC"()I",                    FN_PTR(Unsafe_PageSize)},
     {CC"defineClass",        CC"("DC0_Args")"CLS,        FN_PTR(Unsafe_DefineClass0)},
     {CC"defineClass",        CC"("DC_Args")"CLS,         FN_PTR(Unsafe_DefineClass)},
     {CC"allocateInstance",   CC"("CLS")"OBJ,             FN_PTR(Unsafe_AllocateInstance)},
     {CC"monitorEnter",       CC"("OBJ")V",               FN_PTR(Unsafe_MonitorEnter)},
     {CC"monitorExit",        CC"("OBJ")V",               FN_PTR(Unsafe_MonitorExit)},
     {CC"throwException",     CC"("THR")V",               FN_PTR(Unsafe_ThrowException)}
 };
 // These are the methods prior to the JSR 166 changes in 1.5.0
 static JNINativeMethod methods_141[] = {
     {CC"getObject",        CC"("OBJ"J)"OBJ"",   FN_PTR(Unsafe_GetObject)},
     {CC"putObject",        CC"("OBJ"J"OBJ")V",  FN_PTR(Unsafe_SetObject)},
     DECLARE_GETSETOOP_141(Boolean, Z),
     DECLARE_GETSETOOP_141(Byte, B),
     DECLARE_GETSETOOP_141(Short, S),
     DECLARE_GETSETOOP_141(Char, C),
     DECLARE_GETSETOOP_141(Int, I),
     DECLARE_GETSETOOP_141(Long, J),
     DECLARE_GETSETOOP_141(Float, F),
     DECLARE_GETSETOOP_141(Double, D),
     DECLARE_GETSETNATIVE(Byte, B),
     DECLARE_GETSETNATIVE(Short, S),
     DECLARE_GETSETNATIVE(Char, C),
     DECLARE_GETSETNATIVE(Int, I),
     DECLARE_GETSETNATIVE(Long, J),
     DECLARE_GETSETNATIVE(Float, F),
     DECLARE_GETSETNATIVE(Double, D),
     {CC"getAddress",         CC"("ADR")"ADR,             FN_PTR(Unsafe_GetNativeAddress)},
     {CC"putAddress",         CC"("ADR""ADR")V",          FN_PTR(Unsafe_SetNativeAddress)},
     {CC"allocateMemory",     CC"(J)"ADR,                 FN_PTR(Unsafe_AllocateMemory)},
     {CC"reallocateMemory",   CC"("ADR"J)"ADR,            FN_PTR(Unsafe_ReallocateMemory)},
     {CC"freeMemory",         CC"("ADR")V",               FN_PTR(Unsafe_FreeMemory)},
     {CC"objectFieldOffset",  CC"("FLD")J",               FN_PTR(Unsafe_ObjectFieldOffset)},
     {CC"staticFieldOffset",  CC"("FLD")J",               FN_PTR(Unsafe_StaticFieldOffset)},
     {CC"staticFieldBase",    CC"("FLD")"OBJ,             FN_PTR(Unsafe_StaticFieldBaseFromField)},
     {CC"ensureClassInitialized",CC"("CLS")V",            FN_PTR(Unsafe_EnsureClassInitialized)},
     {CC"arrayBaseOffset",    CC"("CLS")I",               FN_PTR(Unsafe_ArrayBaseOffset)},
     {CC"arrayIndexScale",    CC"("CLS")I",               FN_PTR(Unsafe_ArrayIndexScale)},
     {CC"addressSize",        CC"()I",                    FN_PTR(Unsafe_AddressSize)},
     {CC"pageSize",           CC"()I",                    FN_PTR(Unsafe_PageSize)},
     {CC"defineClass",        CC"("DC0_Args")"CLS,        FN_PTR(Unsafe_DefineClass0)},
     {CC"defineClass",        CC"("DC_Args")"CLS,         FN_PTR(Unsafe_DefineClass)},
     {CC"allocateInstance",   CC"("CLS")"OBJ,             FN_PTR(Unsafe_AllocateInstance)},
     {CC"monitorEnter",       CC"("OBJ")V",               FN_PTR(Unsafe_MonitorEnter)},
     {CC"monitorExit",        CC"("OBJ")V",               FN_PTR(Unsafe_MonitorExit)},
     {CC"throwException",     CC"("THR")V",               FN_PTR(Unsafe_ThrowException)}
 };
 // These are the methods prior to the JSR 166 changes in 1.6.0
 static JNINativeMethod methods_15[] = {
     {CC"getObject",        CC"("OBJ"J)"OBJ"",   FN_PTR(Unsafe_GetObject)},
     {CC"putObject",        CC"("OBJ"J"OBJ")V",  FN_PTR(Unsafe_SetObject)},
     {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"",   FN_PTR(Unsafe_GetObjectVolatile)},
     {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V",  FN_PTR(Unsafe_SetObjectVolatile)},
     DECLARE_GETSETOOP(Boolean, Z),
     DECLARE_GETSETOOP(Byte, B),
     DECLARE_GETSETOOP(Short, S),
     DECLARE_GETSETOOP(Char, C),
     DECLARE_GETSETOOP(Int, I),
     DECLARE_GETSETOOP(Long, J),
     DECLARE_GETSETOOP(Float, F),
     DECLARE_GETSETOOP(Double, D),
     DECLARE_GETSETNATIVE(Byte, B),
     DECLARE_GETSETNATIVE(Short, S),
     DECLARE_GETSETNATIVE(Char, C),
     DECLARE_GETSETNATIVE(Int, I),
     DECLARE_GETSETNATIVE(Long, J),
     DECLARE_GETSETNATIVE(Float, F),
     DECLARE_GETSETNATIVE(Double, D),
     {CC"getAddress",         CC"("ADR")"ADR,             FN_PTR(Unsafe_GetNativeAddress)},
     {CC"putAddress",         CC"("ADR""ADR")V",          FN_PTR(Unsafe_SetNativeAddress)},
     {CC"allocateMemory",     CC"(J)"ADR,                 FN_PTR(Unsafe_AllocateMemory)},
     {CC"reallocateMemory",   CC"("ADR"J)"ADR,            FN_PTR(Unsafe_ReallocateMemory)},
     {CC"freeMemory",         CC"("ADR")V",               FN_PTR(Unsafe_FreeMemory)},
     {CC"objectFieldOffset",  CC"("FLD")J",               FN_PTR(Unsafe_ObjectFieldOffset)},
     {CC"staticFieldOffset",  CC"("FLD")J",               FN_PTR(Unsafe_StaticFieldOffset)},
     {CC"staticFieldBase",    CC"("FLD")"OBJ,             FN_PTR(Unsafe_StaticFieldBaseFromField)},
     {CC"ensureClassInitialized",CC"("CLS")V",            FN_PTR(Unsafe_EnsureClassInitialized)},
     {CC"arrayBaseOffset",    CC"("CLS")I",               FN_PTR(Unsafe_ArrayBaseOffset)},
     {CC"arrayIndexScale",    CC"("CLS")I",               FN_PTR(Unsafe_ArrayIndexScale)},
     {CC"addressSize",        CC"()I",                    FN_PTR(Unsafe_AddressSize)},
     {CC"pageSize",           CC"()I",                    FN_PTR(Unsafe_PageSize)},
     {CC"defineClass",        CC"("DC0_Args")"CLS,        FN_PTR(Unsafe_DefineClass0)},
     {CC"defineClass",        CC"("DC_Args")"CLS,         FN_PTR(Unsafe_DefineClass)},
     {CC"allocateInstance",   CC"("CLS")"OBJ,             FN_PTR(Unsafe_AllocateInstance)},
     {CC"monitorEnter",       CC"("OBJ")V",               FN_PTR(Unsafe_MonitorEnter)},
     {CC"monitorExit",        CC"("OBJ")V",               FN_PTR(Unsafe_MonitorExit)},
     {CC"throwException",     CC"("THR")V",               FN_PTR(Unsafe_ThrowException)},
     {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z",  FN_PTR(Unsafe_CompareAndSwapObject)},
     {CC"compareAndSwapInt",  CC"("OBJ"J""I""I"")Z",      FN_PTR(Unsafe_CompareAndSwapInt)},
     {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z",      FN_PTR(Unsafe_CompareAndSwapLong)},
     {CC"park",               CC"(ZJ)V",                  FN_PTR(Unsafe_Park)},
     {CC"unpark",             CC"("OBJ")V",               FN_PTR(Unsafe_Unpark)}
 };
 // These are the methods for 1.6.0 and 1.7.0
 static JNINativeMethod methods_16[] = {
     {CC"getObject",        CC"("OBJ"J)"OBJ"",   FN_PTR(Unsafe_GetObject)},
     {CC"putObject",        CC"("OBJ"J"OBJ")V",  FN_PTR(Unsafe_SetObject)},
     {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"",   FN_PTR(Unsafe_GetObjectVolatile)},
     {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V",  FN_PTR(Unsafe_SetObjectVolatile)},
     DECLARE_GETSETOOP(Boolean, Z),
     DECLARE_GETSETOOP(Byte, B),
     DECLARE_GETSETOOP(Short, S),
     DECLARE_GETSETOOP(Char, C),
     DECLARE_GETSETOOP(Int, I),
     DECLARE_GETSETOOP(Long, J),
     DECLARE_GETSETOOP(Float, F),
     DECLARE_GETSETOOP(Double, D),
     DECLARE_GETSETNATIVE(Byte, B),
     DECLARE_GETSETNATIVE(Short, S),
     DECLARE_GETSETNATIVE(Char, C),
     DECLARE_GETSETNATIVE(Int, I),
     DECLARE_GETSETNATIVE(Long, J),
     DECLARE_GETSETNATIVE(Float, F),
     DECLARE_GETSETNATIVE(Double, D),
     {CC"getAddress",         CC"("ADR")"ADR,             FN_PTR(Unsafe_GetNativeAddress)},
     {CC"putAddress",         CC"("ADR""ADR")V",          FN_PTR(Unsafe_SetNativeAddress)},
     {CC"allocateMemory",     CC"(J)"ADR,                 FN_PTR(Unsafe_AllocateMemory)},
     {CC"reallocateMemory",   CC"("ADR"J)"ADR,            FN_PTR(Unsafe_ReallocateMemory)},
     {CC"freeMemory",         CC"("ADR")V",               FN_PTR(Unsafe_FreeMemory)},
     {CC"objectFieldOffset",  CC"("FLD")J",               FN_PTR(Unsafe_ObjectFieldOffset)},
     {CC"staticFieldOffset",  CC"("FLD")J",               FN_PTR(Unsafe_StaticFieldOffset)},
     {CC"staticFieldBase",    CC"("FLD")"OBJ,             FN_PTR(Unsafe_StaticFieldBaseFromField)},
     {CC"ensureClassInitialized",CC"("CLS")V",            FN_PTR(Unsafe_EnsureClassInitialized)},
     {CC"arrayBaseOffset",    CC"("CLS")I",               FN_PTR(Unsafe_ArrayBaseOffset)},
     {CC"arrayIndexScale",    CC"("CLS")I",               FN_PTR(Unsafe_ArrayIndexScale)},
     {CC"addressSize",        CC"()I",                    FN_PTR(Unsafe_AddressSize)},
     {CC"pageSize",           CC"()I",                    FN_PTR(Unsafe_PageSize)},
     {CC"defineClass",        CC"("DC0_Args")"CLS,        FN_PTR(Unsafe_DefineClass0)},
     {CC"defineClass",        CC"("DC_Args")"CLS,         FN_PTR(Unsafe_DefineClass)},
     {CC"allocateInstance",   CC"("CLS")"OBJ,             FN_PTR(Unsafe_AllocateInstance)},
     {CC"monitorEnter",       CC"("OBJ")V",               FN_PTR(Unsafe_MonitorEnter)},
     {CC"monitorExit",        CC"("OBJ")V",               FN_PTR(Unsafe_MonitorExit)},
     {CC"tryMonitorEnter",    CC"("OBJ")Z",               FN_PTR(Unsafe_TryMonitorEnter)},
     {CC"throwException",     CC"("THR")V",               FN_PTR(Unsafe_ThrowException)},
     {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z",  FN_PTR(Unsafe_CompareAndSwapObject)},
     {CC"compareAndSwapInt",  CC"("OBJ"J""I""I"")Z",      FN_PTR(Unsafe_CompareAndSwapInt)},
     {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z",      FN_PTR(Unsafe_CompareAndSwapLong)},
     {CC"putOrderedObject",   CC"("OBJ"J"OBJ")V",         FN_PTR(Unsafe_SetOrderedObject)},
     {CC"putOrderedInt",      CC"("OBJ"JI)V",             FN_PTR(Unsafe_SetOrderedInt)},
     {CC"putOrderedLong",     CC"("OBJ"JJ)V",             FN_PTR(Unsafe_SetOrderedLong)},
     {CC"park",               CC"(ZJ)V",                  FN_PTR(Unsafe_Park)},
     {CC"unpark",             CC"("OBJ")V",               FN_PTR(Unsafe_Unpark)}
 };
 // These are the methods for 1.8.0
 static JNINativeMethod methods_18[] = {
     {CC"getObject",        CC"("OBJ"J)"OBJ"",   FN_PTR(Unsafe_GetObject)},
     {CC"putObject",        CC"("OBJ"J"OBJ")V",  FN_PTR(Unsafe_SetObject)},
     {CC"getObjectVolatile",CC"("OBJ"J)"OBJ"",   FN_PTR(Unsafe_GetObjectVolatile)},
     {CC"putObjectVolatile",CC"("OBJ"J"OBJ")V",  FN_PTR(Unsafe_SetObjectVolatile)},
     DECLARE_GETSETOOP(Boolean, Z),
     DECLARE_GETSETOOP(Byte, B),
     DECLARE_GETSETOOP(Short, S),
     DECLARE_GETSETOOP(Char, C),
     DECLARE_GETSETOOP(Int, I),
     DECLARE_GETSETOOP(Long, J),
     DECLARE_GETSETOOP(Float, F),
     DECLARE_GETSETOOP(Double, D),
     DECLARE_GETSETNATIVE(Byte, B),
     DECLARE_GETSETNATIVE(Short, S),
     DECLARE_GETSETNATIVE(Char, C),
     DECLARE_GETSETNATIVE(Int, I),
     DECLARE_GETSETNATIVE(Long, J),
     DECLARE_GETSETNATIVE(Float, F),
     DECLARE_GETSETNATIVE(Double, D),
     {CC"getAddress",         CC"("ADR")"ADR,             FN_PTR(Unsafe_GetNativeAddress)},
     {CC"putAddress",         CC"("ADR""ADR")V",          FN_PTR(Unsafe_SetNativeAddress)},
     {CC"allocateMemory",     CC"(J)"ADR,                 FN_PTR(Unsafe_AllocateMemory)},
     {CC"reallocateMemory",   CC"("ADR"J)"ADR,            FN_PTR(Unsafe_ReallocateMemory)},
     {CC"freeMemory",         CC"("ADR")V",               FN_PTR(Unsafe_FreeMemory)},
     {CC"objectFieldOffset",  CC"("FLD")J",               FN_PTR(Unsafe_ObjectFieldOffset)},
     {CC"staticFieldOffset",  CC"("FLD")J",               FN_PTR(Unsafe_StaticFieldOffset)},
     {CC"staticFieldBase",    CC"("FLD")"OBJ,             FN_PTR(Unsafe_StaticFieldBaseFromField)},
     {CC"ensureClassInitialized",CC"("CLS")V",            FN_PTR(Unsafe_EnsureClassInitialized)},
     {CC"arrayBaseOffset",    CC"("CLS")I",               FN_PTR(Unsafe_ArrayBaseOffset)},
     {CC"arrayIndexScale",    CC"("CLS")I",               FN_PTR(Unsafe_ArrayIndexScale)},
     {CC"addressSize",        CC"()I",                    FN_PTR(Unsafe_AddressSize)},
     {CC"pageSize",           CC"()I",                    FN_PTR(Unsafe_PageSize)},
     {CC"defineClass",        CC"("DC_Args")"CLS,         FN_PTR(Unsafe_DefineClass)},
     {CC"allocateInstance",   CC"("CLS")"OBJ,             FN_PTR(Unsafe_AllocateInstance)},
     {CC"monitorEnter",       CC"("OBJ")V",               FN_PTR(Unsafe_MonitorEnter)},
     {CC"monitorExit",        CC"("OBJ")V",               FN_PTR(Unsafe_MonitorExit)},
     {CC"tryMonitorEnter",    CC"("OBJ")Z",               FN_PTR(Unsafe_TryMonitorEnter)},
     {CC"throwException",     CC"("THR")V",               FN_PTR(Unsafe_ThrowException)},
     {CC"compareAndSwapObject", CC"("OBJ"J"OBJ""OBJ")Z",  FN_PTR(Unsafe_CompareAndSwapObject)},
     {CC"compareAndSwapInt",  CC"("OBJ"J""I""I"")Z",      FN_PTR(Unsafe_CompareAndSwapInt)},
     {CC"compareAndSwapLong", CC"("OBJ"J""J""J"")Z",      FN_PTR(Unsafe_CompareAndSwapLong)},
     {CC"putOrderedObject",   CC"("OBJ"J"OBJ")V",         FN_PTR(Unsafe_SetOrderedObject)},
     {CC"putOrderedInt",      CC"("OBJ"JI)V",             FN_PTR(Unsafe_SetOrderedInt)},
     {CC"putOrderedLong",     CC"("OBJ"JJ)V",             FN_PTR(Unsafe_SetOrderedLong)},
     {CC"park",               CC"(ZJ)V",                  FN_PTR(Unsafe_Park)},
     {CC"unpark",             CC"("OBJ")V",               FN_PTR(Unsafe_Unpark)}
 };
 JNINativeMethod loadavg_method[] = {
     {CC"getLoadAverage",     CC"([DI)I",                 FN_PTR(Unsafe_Loadavg)}
 };
 JNINativeMethod prefetch_methods[] = {
     {CC"prefetchRead",       CC"("OBJ"J)V",              FN_PTR(Unsafe_PrefetchRead)},
     {CC"prefetchWrite",      CC"("OBJ"J)V",              FN_PTR(Unsafe_PrefetchWrite)},
     {CC"prefetchReadStatic", CC"("OBJ"J)V",              FN_PTR(Unsafe_PrefetchRead)},
     {CC"prefetchWriteStatic",CC"("OBJ"J)V",              FN_PTR(Unsafe_PrefetchWrite)}
 };
 JNINativeMethod memcopy_methods_17[] = {
     {CC"copyMemory",         CC"("OBJ"J"OBJ"JJ)V",       FN_PTR(Unsafe_CopyMemory2)},
     {CC"setMemory",          CC"("OBJ"JJB)V",            FN_PTR(Unsafe_SetMemory2)}
 };
 JNINativeMethod memcopy_methods_15[] = {
     {CC"setMemory",          CC"("ADR"JB)V",             FN_PTR(Unsafe_SetMemory)},
     {CC"copyMemory",         CC"("ADR ADR"J)V",          FN_PTR(Unsafe_CopyMemory)}
 };
 JNINativeMethod anonk_methods[] = {
     {CC"defineAnonymousClass", CC"("DAC_Args")"CLS,      FN_PTR(Unsafe_DefineAnonymousClass)},
 };
 JNINativeMethod lform_methods[] = {
     {CC"shouldBeInitialized",CC"("CLS")Z",               FN_PTR(Unsafe_ShouldBeInitialized)},
 };
 JNINativeMethod fence_methods[] = {
     {CC"loadFence",          CC"()V",                    FN_PTR(Unsafe_LoadFence)},
     {CC"storeFence",         CC"()V",                    FN_PTR(Unsafe_StoreFence)},
     {CC"fullFence",          CC"()V",                    FN_PTR(Unsafe_FullFence)},
 };
 #undef CC
 #undef FN_PTR
 #undef ADR
 #undef LANG
 #undef OBJ
 #undef CLS
 #undef CTR
 #undef FLD
 #undef MTH
 #undef THR
 #undef DC0_Args
 #undef DC_Args
 #undef DECLARE_GETSETOOP
 #undef DECLARE_GETSETNATIVE
 /**
  * Helper method to register native methods.
  */
 static bool register_natives(const char* message, JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) {
   int status = env->RegisterNatives(clazz, methods, nMethods);
   if (status < 0 || env->ExceptionOccurred()) {
     if (PrintMiscellaneous && (Verbose || WizardMode)) {
       tty->print_cr("Unsafe:  failed registering %s", message);
     }
     env->ExceptionClear();
     return false;
   } else {
     if (PrintMiscellaneous && (Verbose || WizardMode)) {
       tty->print_cr("Unsafe:  successfully registered %s", message);
     }
     return true;
   }
 }
 // This one function is exported, used by NativeLookup.
 // The Unsafe_xxx functions above are called only from the interpreter.
 // The optimizer looks at names and signatures to recognize
 // individual functions.
 JVM_ENTRY(void, JVM_RegisterUnsafeMethods(JNIEnv *env, jclass unsafecls))
   UnsafeWrapper("JVM_RegisterUnsafeMethods");
   {
     ThreadToNativeFromVM ttnfv(thread);
     // Unsafe methods
     {
       bool success = false;
       // We need to register the 1.6 methods first because the 1.8 methods would register fine on 1.7 and 1.6
       if (!success) {
         success = register_natives("1.6 methods",   env, unsafecls, methods_16,  sizeof(methods_16)/sizeof(JNINativeMethod));
       }
       if (!success) {
         success = register_natives("1.8 methods",   env, unsafecls, methods_18,  sizeof(methods_18)/sizeof(JNINativeMethod));
       }
       if (!success) {
         success = register_natives("1.5 methods",   env, unsafecls, methods_15,  sizeof(methods_15)/sizeof(JNINativeMethod));
       }
       if (!success) {
         success = register_natives("1.4.1 methods", env, unsafecls, methods_141, sizeof(methods_141)/sizeof(JNINativeMethod));
       }
       if (!success) {
         success = register_natives("1.4.0 methods", env, unsafecls, methods_140, sizeof(methods_140)/sizeof(JNINativeMethod));
       }
       guarantee(success, "register unsafe natives");
     }
     // Unsafe.getLoadAverage
     register_natives("1.6 loadavg method", env, unsafecls, loadavg_method, sizeof(loadavg_method)/sizeof(JNINativeMethod));
     // Prefetch methods
     register_natives("1.6 prefetch methods", env, unsafecls, prefetch_methods, sizeof(prefetch_methods)/sizeof(JNINativeMethod));
     // Memory copy methods
     {
       bool success = false;
       if (!success) {
         success = register_natives("1.7 memory copy methods", env, unsafecls, memcopy_methods_17, sizeof(memcopy_methods_17)/sizeof(JNINativeMethod));
       }
       if (!success) {
         success = register_natives("1.5 memory copy methods", env, unsafecls, memcopy_methods_15, sizeof(memcopy_methods_15)/sizeof(JNINativeMethod));
       }
     }
     // Unsafe.defineAnonymousClass
     if (EnableInvokeDynamic) {
       register_natives("1.7 define anonymous class method", env, unsafecls, anonk_methods, sizeof(anonk_methods)/sizeof(JNINativeMethod));
     }
     // Unsafe.shouldBeInitialized
     if (EnableInvokeDynamic) {
       register_natives("1.7 LambdaForm support", env, unsafecls, lform_methods, sizeof(lform_methods)/sizeof(JNINativeMethod));
     }
     // Fence methods
     register_natives("1.8 fence methods", env, unsafecls, fence_methods, sizeof(fence_methods)/sizeof(JNINativeMethod));
   }
 JVM_END

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/prims/unsafe.cpp@7301840ea20e (annotated)

src/share/vm/prims/unsafe.cpp