jdk8-mips64-public/hotspot: src/share/vm/prims/jni.cpp@828eafbd85cc (annotated)

src/share/vm/prims/jni.cpp@828eafbd85cc (annotated)

src/share/vm/prims/jni.cpp

Wed, 01 Dec 2010 18:26:32 -0500

author: ikrylov
date: Wed, 01 Dec 2010 18:26:32 -0500
changeset 2322: 828eafbd85cc
parent 2314: f95d63e2154a
child 2331: 017cd8bce8a8
permissions: -rw-r--r--

6348631: remove the use of the HPI library from Hotspot
Summary: move functions from hpi library to hotspot, communicate with licensees and open source community, check jdk for dependency, file CCC request
Reviewed-by: coleenp, acorn, dsamersoff

 /*
  * Copyright (c) 1997, 2010, 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/classLoader.hpp"
 #include "classfile/javaClasses.hpp"
 #include "classfile/symbolTable.hpp"
 #include "classfile/systemDictionary.hpp"
 #include "classfile/vmSymbols.hpp"
 #include "interpreter/linkResolver.hpp"
 #include "memory/allocation.inline.hpp"
 #include "memory/gcLocker.inline.hpp"
 #include "memory/oopFactory.hpp"
 #include "memory/universe.inline.hpp"
 #include "oops/instanceKlass.hpp"
 #include "oops/instanceOop.hpp"
 #include "oops/markOop.hpp"
 #include "oops/methodOop.hpp"
 #include "oops/objArrayKlass.hpp"
 #include "oops/objArrayOop.hpp"
 #include "oops/oop.inline.hpp"
 #include "oops/symbolOop.hpp"
 #include "oops/typeArrayKlass.hpp"
 #include "oops/typeArrayOop.hpp"
 #include "prims/jni.h"
 #include "prims/jniCheck.hpp"
 #include "prims/jniFastGetField.hpp"
 #include "prims/jvm.h"
 #include "prims/jvm_misc.hpp"
 #include "prims/jvmtiExport.hpp"
 #include "prims/jvmtiThreadState.hpp"
 #include "runtime/compilationPolicy.hpp"
 #include "runtime/fieldDescriptor.hpp"
 #include "runtime/fprofiler.hpp"
 #include "runtime/handles.inline.hpp"
 #include "runtime/interfaceSupport.hpp"
 #include "runtime/java.hpp"
 #include "runtime/javaCalls.hpp"
 #include "runtime/jfieldIDWorkaround.hpp"
 #include "runtime/reflection.hpp"
 #include "runtime/sharedRuntime.hpp"
 #include "runtime/signature.hpp"
 #include "runtime/vm_operations.hpp"
 #include "services/runtimeService.hpp"
 #include "utilities/defaultStream.hpp"
 #include "utilities/dtrace.hpp"
 #include "utilities/events.hpp"
 #include "utilities/histogram.hpp"
 #ifdef TARGET_ARCH_x86
 # include "jniTypes_x86.hpp"
 #endif
 #ifdef TARGET_ARCH_sparc
 # include "jniTypes_sparc.hpp"
 #endif
 #ifdef TARGET_ARCH_zero
 # include "jniTypes_zero.hpp"
 #endif
 #ifdef TARGET_OS_FAMILY_linux
 # include "os_linux.inline.hpp"
 # include "thread_linux.inline.hpp"
 #endif
 #ifdef TARGET_OS_FAMILY_solaris
 # include "os_solaris.inline.hpp"
 # include "thread_solaris.inline.hpp"
 #endif
 #ifdef TARGET_OS_FAMILY_windows
 # include "os_windows.inline.hpp"
 # include "thread_windows.inline.hpp"
 #endif
 static jint CurrentVersion = JNI_VERSION_1_6;
 // The DT_RETURN_MARK macros create a scoped object to fire the dtrace
 // '-return' probe regardless of the return path is taken out of the function.
 // Methods that have multiple return paths use this to avoid having to
 // instrument each return path.  Methods that use CHECK or THROW must use this
 // since those macros can cause an immedate uninstrumented return.
 //
 // In order to get the return value, a reference to the variable containing
 // the return value must be passed to the contructor of the object, and
 // the return value must be set before return (since the mark object has
 // a reference to it).
 //
 // Example:
 // DT_RETURN_MARK_DECL(SomeFunc, int);
 // JNI_ENTRY(int, SomeFunc, ...)
 //   int return_value = 0;
 //   DT_RETURN_MARK(SomeFunc, int, (const int&)return_value);
 //   foo(CHECK_0)
 //   return_value = 5;
 //   return return_value;
 // JNI_END
 #define DT_RETURN_MARK_DECL(name, type)                                    \
   HS_DTRACE_PROBE_DECL1(hotspot_jni, name##__return, type);                \
   DTRACE_ONLY(                                                             \
     class DTraceReturnProbeMark_##name {                                   \
      public:                                                               \
       const type& _ret_ref;                                                \
       DTraceReturnProbeMark_##name(const type& v) : _ret_ref(v) {}         \
       ~DTraceReturnProbeMark_##name() {                                    \
         HS_DTRACE_PROBE1(hotspot_jni, name##__return, _ret_ref);           \
       }                                                                    \
     }                                                                      \
   )
 // Void functions are simpler since there's no return value
 #define DT_VOID_RETURN_MARK_DECL(name)                                     \
   HS_DTRACE_PROBE_DECL0(hotspot_jni, name##__return);                      \
   DTRACE_ONLY(                                                             \
     class DTraceReturnProbeMark_##name {                                   \
      public:                                                               \
       ~DTraceReturnProbeMark_##name() {                                    \
         HS_DTRACE_PROBE0(hotspot_jni, name##__return);                     \
       }                                                                    \
     }                                                                      \
   )
 // Place these macros in the function to mark the return.  Non-void
 // functions need the type and address of the return value.
 #define DT_RETURN_MARK(name, type, ref) \
   DTRACE_ONLY( DTraceReturnProbeMark_##name dtrace_return_mark(ref) )
 #define DT_VOID_RETURN_MARK(name) \
   DTRACE_ONLY( DTraceReturnProbeMark_##name dtrace_return_mark )
 // Use these to select distinct code for floating-point vs. non-floating point
 // situations.  Used from within common macros where we need slightly
 // different behavior for Float/Double
 #define FP_SELECT_Boolean(intcode, fpcode) intcode
 #define FP_SELECT_Byte(intcode, fpcode)    intcode
 #define FP_SELECT_Char(intcode, fpcode)    intcode
 #define FP_SELECT_Short(intcode, fpcode)   intcode
 #define FP_SELECT_Object(intcode, fpcode)  intcode
 #define FP_SELECT_Int(intcode, fpcode)     intcode
 #define FP_SELECT_Long(intcode, fpcode)    intcode
 #define FP_SELECT_Float(intcode, fpcode)   fpcode
 #define FP_SELECT_Double(intcode, fpcode)  fpcode
 #define FP_SELECT(TypeName, intcode, fpcode) \
   FP_SELECT_##TypeName(intcode, fpcode)
 #define COMMA ,
 // Choose DT_RETURN_MARK macros  based on the type: float/double -> void
 // (dtrace doesn't do FP yet)
 #define DT_RETURN_MARK_DECL_FOR(TypeName, name, type) \
   FP_SELECT(TypeName, \
     DT_RETURN_MARK_DECL(name, type), DT_VOID_RETURN_MARK_DECL(name) )
 #define DT_RETURN_MARK_FOR(TypeName, name, type, ref) \
   FP_SELECT(TypeName, \
     DT_RETURN_MARK(name, type, ref), DT_VOID_RETURN_MARK(name) )
 // out-of-line helpers for class jfieldIDWorkaround:
 bool jfieldIDWorkaround::is_valid_jfieldID(klassOop k, jfieldID id) {
   if (jfieldIDWorkaround::is_instance_jfieldID(k, id)) {
     uintptr_t as_uint = (uintptr_t) id;
     intptr_t offset = raw_instance_offset(id);
     if (is_checked_jfieldID(id)) {
       if (!klass_hash_ok(k, id)) {
         return false;
       }
     }
     return instanceKlass::cast(k)->contains_field_offset(offset);
   } else {
     JNIid* result = (JNIid*) id;
 #ifdef ASSERT
     return result != NULL && result->is_static_field_id();
 #else
     return result != NULL;
 #endif
   }
 }
 intptr_t jfieldIDWorkaround::encode_klass_hash(klassOop k, intptr_t offset) {
   if (offset <= small_offset_mask) {
     klassOop field_klass = k;
     klassOop super_klass = Klass::cast(field_klass)->super();
     // With compressed oops the most super class with nonstatic fields would
     // be the owner of fields embedded in the header.
     while (instanceKlass::cast(super_klass)->has_nonstatic_fields() &&
            instanceKlass::cast(super_klass)->contains_field_offset(offset)) {
       field_klass = super_klass;   // super contains the field also
       super_klass = Klass::cast(field_klass)->super();
     }
     debug_only(No_Safepoint_Verifier nosafepoint;)
     uintptr_t klass_hash = field_klass->identity_hash();
     return ((klass_hash & klass_mask) << klass_shift) | checked_mask_in_place;
   } else {
 #if 0
     #ifndef PRODUCT
     {
       ResourceMark rm;
       warning("VerifyJNIFields: long offset %d in %s", offset, Klass::cast(k)->external_name());
     }
     #endif
 #endif
     return 0;
   }
 }
 bool jfieldIDWorkaround::klass_hash_ok(klassOop k, jfieldID id) {
   uintptr_t as_uint = (uintptr_t) id;
   intptr_t klass_hash = (as_uint >> klass_shift) & klass_mask;
   do {
     debug_only(No_Safepoint_Verifier nosafepoint;)
     // Could use a non-blocking query for identity_hash here...
     if ((k->identity_hash() & klass_mask) == klass_hash)
       return true;
     k = Klass::cast(k)->super();
   } while (k != NULL);
   return false;
 }
 void jfieldIDWorkaround::verify_instance_jfieldID(klassOop k, jfieldID id) {
   guarantee(jfieldIDWorkaround::is_instance_jfieldID(k, id), "must be an instance field" );
   uintptr_t as_uint = (uintptr_t) id;
   intptr_t offset = raw_instance_offset(id);
   if (VerifyJNIFields) {
     if (is_checked_jfieldID(id)) {
       guarantee(klass_hash_ok(k, id),
     "Bug in native code: jfieldID class must match object");
     } else {
 #if 0
       #ifndef PRODUCT
       if (Verbose) {
   ResourceMark rm;
   warning("VerifyJNIFields: unverified offset %d for %s", offset, Klass::cast(k)->external_name());
       }
       #endif
 #endif
     }
   }
   guarantee(instanceKlass::cast(k)->contains_field_offset(offset),
       "Bug in native code: jfieldID offset must address interior of object");
 }
 // Pick a reasonable higher bound for local capacity requested
 // for EnsureLocalCapacity and PushLocalFrame.  We don't want it too
 // high because a test (or very unusual application) may try to allocate
 // that many handles and run out of swap space.  An implementation is
 // permitted to allocate more handles than the ensured capacity, so this
 // value is set high enough to prevent compatibility problems.
 const int MAX_REASONABLE_LOCAL_CAPACITY = 4*K;
 // Wrapper to trace JNI functions
 #ifdef ASSERT
   Histogram* JNIHistogram;
   static volatile jint JNIHistogram_lock = 0;
   class JNITraceWrapper : public StackObj {
    public:
     JNITraceWrapper(const char* format, ...) {
       if (TraceJNICalls) {
         va_list ap;
         va_start(ap, format);
         tty->print("JNI ");
         tty->vprint_cr(format, ap);
         va_end(ap);
       }
     }
   };
   class JNIHistogramElement : public HistogramElement {
     public:
      JNIHistogramElement(const char* name);
   };
   JNIHistogramElement::JNIHistogramElement(const char* elementName) {
     _name = elementName;
     uintx count = 0;
     while (Atomic::cmpxchg(1, &JNIHistogram_lock, 0) != 0) {
       while (OrderAccess::load_acquire(&JNIHistogram_lock) != 0) {
         count +=1;
         if ( (WarnOnStalledSpinLock > 0)
           && (count % WarnOnStalledSpinLock == 0)) {
           warning("JNIHistogram_lock seems to be stalled");
         }
       }
      }
     if(JNIHistogram == NULL)
       JNIHistogram = new Histogram("JNI Call Counts",100);
     JNIHistogram->add_element(this);
     Atomic::dec(&JNIHistogram_lock);
   }
   #define JNICountWrapper(arg)                                     \
      static JNIHistogramElement* e = new JNIHistogramElement(arg); \
       /* There is a MT-race condition in VC++. So we need to make sure that that e has been initialized */ \
      if (e != NULL) e->increment_count()
   #define JNIWrapper(arg) JNICountWrapper(arg); JNITraceWrapper(arg)
 #else
   #define JNIWrapper(arg)
 #endif
 // Implementation of JNI entries
 DT_RETURN_MARK_DECL(DefineClass, jclass);
 JNI_ENTRY(jclass, jni_DefineClass(JNIEnv *env, const char *name, jobject loaderRef,
                                   const jbyte *buf, jsize bufLen))
   JNIWrapper("DefineClass");
   DTRACE_PROBE5(hotspot_jni, DefineClass__entry,
     env, name, loaderRef, buf, bufLen);
   jclass cls = NULL;
   DT_RETURN_MARK(DefineClass, jclass, (const jclass&)cls);
   // Since exceptions can be thrown, class initialization can take place
   // if name is NULL no check for class name in .class stream has to be made.
   symbolHandle class_name;
   if (name != NULL) {
     const int str_len = (int)strlen(name);
     if (str_len > symbolOopDesc::max_length()) {
       // It's impossible to create this class;  the name cannot fit
       // into the constant pool.
       THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
     }
     class_name = oopFactory::new_symbol_handle(name, str_len, CHECK_NULL);
   }
   ResourceMark rm(THREAD);
   ClassFileStream st((u1*) buf, bufLen, NULL);
   Handle class_loader (THREAD, JNIHandles::resolve(loaderRef));
   if (UsePerfData && !class_loader.is_null()) {
     // check whether the current caller thread holds the lock or not.
     // If not, increment the corresponding counter
     if (ObjectSynchronizer::
         query_lock_ownership((JavaThread*)THREAD, class_loader) !=
         ObjectSynchronizer::owner_self) {
       ClassLoader::sync_JNIDefineClassLockFreeCounter()->inc();
     }
   }
   klassOop k = SystemDictionary::resolve_from_stream(class_name, class_loader,
                                                      Handle(), &st, true,
                                                      CHECK_NULL);
   if (TraceClassResolution && k != NULL) {
     trace_class_resolution(k);
   }
   cls = (jclass)JNIHandles::make_local(
     env, Klass::cast(k)->java_mirror());
   return cls;
 JNI_END
 static bool first_time_FindClass = true;
 DT_RETURN_MARK_DECL(FindClass, jclass);
 JNI_ENTRY(jclass, jni_FindClass(JNIEnv *env, const char *name))
   JNIWrapper("FindClass");
   DTRACE_PROBE2(hotspot_jni, FindClass__entry, env, name);
   jclass result = NULL;
   DT_RETURN_MARK(FindClass, jclass, (const jclass&)result);
   // Remember if we are the first invocation of jni_FindClass
   bool first_time = first_time_FindClass;
   first_time_FindClass = false;
   // Sanity check the name:  it cannot be null or larger than the maximum size
   // name we can fit in the constant pool.
   if (name == NULL || (int)strlen(name) > symbolOopDesc::max_length()) {
     THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
   }
   //%note jni_3
   Handle loader;
   Handle protection_domain;
   // Find calling class
   instanceKlassHandle k (THREAD, thread->security_get_caller_class(0));
   if (k.not_null()) {
     loader = Handle(THREAD, k->class_loader());
     // Special handling to make sure JNI_OnLoad and JNI_OnUnload are executed
     // in the correct class context.
     if (loader.is_null() &&
         k->name() == vmSymbols::java_lang_ClassLoader_NativeLibrary()) {
       JavaValue result(T_OBJECT);
       JavaCalls::call_static(&result, k,
                                       vmSymbolHandles::getFromClass_name(),
                                       vmSymbolHandles::void_class_signature(),
                                       thread);
       if (HAS_PENDING_EXCEPTION) {
         Handle ex(thread, thread->pending_exception());
         CLEAR_PENDING_EXCEPTION;
         THROW_HANDLE_0(ex);
       }
       oop mirror = (oop) result.get_jobject();
       loader = Handle(THREAD,
         instanceKlass::cast(java_lang_Class::as_klassOop(mirror))->class_loader());
       protection_domain = Handle(THREAD,
         instanceKlass::cast(java_lang_Class::as_klassOop(mirror))->protection_domain());
     }
   } else {
     // We call ClassLoader.getSystemClassLoader to obtain the system class loader.
     loader = Handle(THREAD, SystemDictionary::java_system_loader());
   }
   symbolHandle sym = oopFactory::new_symbol_handle(name, CHECK_NULL);
   result = find_class_from_class_loader(env, sym, true, loader,
                                         protection_domain, true, thread);
   if (TraceClassResolution && result != NULL) {
     trace_class_resolution(java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(result)));
   }
   // If we were the first invocation of jni_FindClass, we enable compilation again
   // rather than just allowing invocation counter to overflow and decay.
   // Controlled by flag DelayCompilationDuringStartup.
   if (first_time && !CompileTheWorld)
     CompilationPolicy::completed_vm_startup();
   return result;
 JNI_END
 DT_RETURN_MARK_DECL(FromReflectedMethod, jmethodID);
 JNI_ENTRY(jmethodID, jni_FromReflectedMethod(JNIEnv *env, jobject method))
   JNIWrapper("FromReflectedMethod");
   DTRACE_PROBE2(hotspot_jni, FromReflectedMethod__entry, env, method);
   jmethodID ret = NULL;
   DT_RETURN_MARK(FromReflectedMethod, jmethodID, (const jmethodID&)ret);
   // method is a handle to a java.lang.reflect.Method object
   oop reflected  = JNIHandles::resolve_non_null(method);
   oop mirror     = NULL;
   int slot       = 0;
   if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
     mirror = java_lang_reflect_Constructor::clazz(reflected);
     slot   = java_lang_reflect_Constructor::slot(reflected);
   } else {
     assert(reflected->klass() == SystemDictionary::reflect_Method_klass(), "wrong type");
     mirror = java_lang_reflect_Method::clazz(reflected);
     slot   = java_lang_reflect_Method::slot(reflected);
   }
   klassOop k     = java_lang_Class::as_klassOop(mirror);
   KlassHandle k1(THREAD, k);
   // Make sure class is initialized before handing id's out to methods
   Klass::cast(k1())->initialize(CHECK_NULL);
   methodOop m = instanceKlass::cast(k1())->method_with_idnum(slot);
   ret = m==NULL? NULL : m->jmethod_id();  // return NULL if reflected method deleted
   return ret;
 JNI_END
 DT_RETURN_MARK_DECL(FromReflectedField, jfieldID);
 JNI_ENTRY(jfieldID, jni_FromReflectedField(JNIEnv *env, jobject field))
   JNIWrapper("FromReflectedField");
   DTRACE_PROBE2(hotspot_jni, FromReflectedField__entry, env, field);
   jfieldID ret = NULL;
   DT_RETURN_MARK(FromReflectedField, jfieldID, (const jfieldID&)ret);
   // field is a handle to a java.lang.reflect.Field object
   oop reflected   = JNIHandles::resolve_non_null(field);
   oop mirror      = java_lang_reflect_Field::clazz(reflected);
   klassOop k      = java_lang_Class::as_klassOop(mirror);
   int slot        = java_lang_reflect_Field::slot(reflected);
   int modifiers   = java_lang_reflect_Field::modifiers(reflected);
   KlassHandle k1(THREAD, k);
   // Make sure class is initialized before handing id's out to fields
   Klass::cast(k1())->initialize(CHECK_NULL);
   // First check if this is a static field
   if (modifiers & JVM_ACC_STATIC) {
     intptr_t offset = instanceKlass::cast(k1())->offset_from_fields( slot );
     JNIid* id = instanceKlass::cast(k1())->jni_id_for(offset);
     assert(id != NULL, "corrupt Field object");
     debug_only(id->set_is_static_field_id();)
     // A jfieldID for a static field is a JNIid specifying the field holder and the offset within the klassOop
     ret = jfieldIDWorkaround::to_static_jfieldID(id);
     return ret;
   }
   // The slot is the index of the field description in the field-array
   // The jfieldID is the offset of the field within the object
   // It may also have hash bits for k, if VerifyJNIFields is turned on.
   intptr_t offset = instanceKlass::cast(k1())->offset_from_fields( slot );
   assert(instanceKlass::cast(k1())->contains_field_offset(offset), "stay within object");
   ret = jfieldIDWorkaround::to_instance_jfieldID(k1(), offset);
   return ret;
 JNI_END
 DT_RETURN_MARK_DECL(ToReflectedMethod, jobject);
 JNI_ENTRY(jobject, jni_ToReflectedMethod(JNIEnv *env, jclass cls, jmethodID method_id, jboolean isStatic))
   JNIWrapper("ToReflectedMethod");
   DTRACE_PROBE4(hotspot_jni, ToReflectedMethod__entry, env, cls, method_id, isStatic);
   jobject ret = NULL;
   DT_RETURN_MARK(ToReflectedMethod, jobject, (const jobject&)ret);
   methodHandle m (THREAD, JNIHandles::resolve_jmethod_id(method_id));
   assert(m->is_static() == (isStatic != 0), "jni_ToReflectedMethod access flags doesn't match");
   oop reflection_method;
   if (m->is_initializer()) {
     reflection_method = Reflection::new_constructor(m, CHECK_NULL);
   } else {
     reflection_method = Reflection::new_method(m, UseNewReflection, false, CHECK_NULL);
   }
   ret = JNIHandles::make_local(env, reflection_method);
   return ret;
 JNI_END
 DT_RETURN_MARK_DECL(GetSuperclass, jclass);
 JNI_ENTRY(jclass, jni_GetSuperclass(JNIEnv *env, jclass sub))
   JNIWrapper("GetSuperclass");
   DTRACE_PROBE2(hotspot_jni, GetSuperclass__entry, env, sub);
   jclass obj = NULL;
   DT_RETURN_MARK(GetSuperclass, jclass, (const jclass&)obj);
   oop mirror = JNIHandles::resolve_non_null(sub);
   // primitive classes return NULL
   if (java_lang_Class::is_primitive(mirror)) return NULL;
   // Rules of Class.getSuperClass as implemented by KLass::java_super:
   // arrays return Object
   // interfaces return NULL
   // proper classes return Klass::super()
   klassOop k = java_lang_Class::as_klassOop(mirror);
   if (Klass::cast(k)->is_interface()) return NULL;
   // return mirror for superclass
   klassOop super = Klass::cast(k)->java_super();
   // super2 is the value computed by the compiler's getSuperClass intrinsic:
   debug_only(klassOop super2 = ( Klass::cast(k)->oop_is_javaArray()
                                  ? SystemDictionary::Object_klass()
                                  : Klass::cast(k)->super() ) );
   assert(super == super2,
          "java_super computation depends on interface, array, other super");
   obj = (super == NULL) ? NULL : (jclass) JNIHandles::make_local(Klass::cast(super)->java_mirror());
   return obj;
 JNI_END
 JNI_QUICK_ENTRY(jboolean, jni_IsAssignableFrom(JNIEnv *env, jclass sub, jclass super))
   JNIWrapper("IsSubclassOf");
   DTRACE_PROBE3(hotspot_jni, IsAssignableFrom__entry, env, sub, super);
   oop sub_mirror   = JNIHandles::resolve_non_null(sub);
   oop super_mirror = JNIHandles::resolve_non_null(super);
   if (java_lang_Class::is_primitive(sub_mirror) ||
       java_lang_Class::is_primitive(super_mirror)) {
     jboolean ret = (sub_mirror == super_mirror);
     DTRACE_PROBE1(hotspot_jni, IsAssignableFrom__return, ret);
     return ret;
   }
   klassOop sub_klass   = java_lang_Class::as_klassOop(sub_mirror);
   klassOop super_klass = java_lang_Class::as_klassOop(super_mirror);
   assert(sub_klass != NULL && super_klass != NULL, "invalid arguments to jni_IsAssignableFrom");
   jboolean ret = Klass::cast(sub_klass)->is_subtype_of(super_klass) ?
                    JNI_TRUE : JNI_FALSE;
   DTRACE_PROBE1(hotspot_jni, IsAssignableFrom__return, ret);
   return ret;
 JNI_END
 DT_RETURN_MARK_DECL(Throw, jint);
 JNI_ENTRY(jint, jni_Throw(JNIEnv *env, jthrowable obj))
   JNIWrapper("Throw");
   DTRACE_PROBE2(hotspot_jni, Throw__entry, env, obj);
   jint ret = JNI_OK;
   DT_RETURN_MARK(Throw, jint, (const jint&)ret);
   THROW_OOP_(JNIHandles::resolve(obj), JNI_OK);
   ShouldNotReachHere();
 JNI_END
 DT_RETURN_MARK_DECL(ThrowNew, jint);
 JNI_ENTRY(jint, jni_ThrowNew(JNIEnv *env, jclass clazz, const char *message))
   JNIWrapper("ThrowNew");
   DTRACE_PROBE3(hotspot_jni, ThrowNew__entry, env, clazz, message);
   jint ret = JNI_OK;
   DT_RETURN_MARK(ThrowNew, jint, (const jint&)ret);
   instanceKlass* k = instanceKlass::cast(java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
   symbolHandle name = symbolHandle(THREAD, k->name());
   Handle class_loader (THREAD,  k->class_loader());
   Handle protection_domain (THREAD, k->protection_domain());
   THROW_MSG_LOADER_(name, (char *)message, class_loader, protection_domain, JNI_OK);
   ShouldNotReachHere();
 JNI_END
 // JNI functions only transform a pending async exception to a synchronous
 // exception in ExceptionOccurred and ExceptionCheck calls, since
 // delivering an async exception in other places won't change the native
 // code's control flow and would be harmful when native code further calls
 // JNI functions with a pending exception. Async exception is also checked
 // during the call, so ExceptionOccurred/ExceptionCheck won't return
 // false but deliver the async exception at the very end during
 // state transition.
 static void jni_check_async_exceptions(JavaThread *thread) {
   assert(thread == Thread::current(), "must be itself");
   thread->check_and_handle_async_exceptions();
 }
 JNI_ENTRY_NO_PRESERVE(jthrowable, jni_ExceptionOccurred(JNIEnv *env))
   JNIWrapper("ExceptionOccurred");
   DTRACE_PROBE1(hotspot_jni, ExceptionOccurred__entry, env);
   jni_check_async_exceptions(thread);
   oop exception = thread->pending_exception();
   jthrowable ret = (jthrowable) JNIHandles::make_local(env, exception);
   DTRACE_PROBE1(hotspot_jni, ExceptionOccurred__return, ret);
   return ret;
 JNI_END
 JNI_ENTRY_NO_PRESERVE(void, jni_ExceptionDescribe(JNIEnv *env))
   JNIWrapper("ExceptionDescribe");
   DTRACE_PROBE1(hotspot_jni, ExceptionDescribe__entry, env);
   if (thread->has_pending_exception()) {
     Handle ex(thread, thread->pending_exception());
     thread->clear_pending_exception();
     if (ex->is_a(SystemDictionary::ThreadDeath_klass())) {
       // Don't print anything if we are being killed.
     } else {
       jio_fprintf(defaultStream::error_stream(), "Exception ");
       if (thread != NULL && thread->threadObj() != NULL) {
         ResourceMark rm(THREAD);
         jio_fprintf(defaultStream::error_stream(),
         "in thread \"%s\" ", thread->get_thread_name());
       }
       if (ex->is_a(SystemDictionary::Throwable_klass())) {
         JavaValue result(T_VOID);
         JavaCalls::call_virtual(&result,
                                 ex,
                                 KlassHandle(THREAD,
                                   SystemDictionary::Throwable_klass()),
                                 vmSymbolHandles::printStackTrace_name(),
                                 vmSymbolHandles::void_method_signature(),
                                 THREAD);
         // If an exception is thrown in the call it gets thrown away. Not much
         // we can do with it. The native code that calls this, does not check
         // for the exception - hence, it might still be in the thread when DestroyVM gets
         // called, potentially causing a few asserts to trigger - since no pending exception
         // is expected.
         CLEAR_PENDING_EXCEPTION;
       } else {
         ResourceMark rm(THREAD);
         jio_fprintf(defaultStream::error_stream(),
         ". Uncaught exception of type %s.",
         Klass::cast(ex->klass())->external_name());
       }
     }
   }
   DTRACE_PROBE(hotspot_jni, ExceptionDescribe__return);
 JNI_END
 JNI_QUICK_ENTRY(void, jni_ExceptionClear(JNIEnv *env))
   JNIWrapper("ExceptionClear");
   DTRACE_PROBE1(hotspot_jni, ExceptionClear__entry, env);
   // The jni code might be using this API to clear java thrown exception.
   // So just mark jvmti thread exception state as exception caught.
   JvmtiThreadState *state = JavaThread::current()->jvmti_thread_state();
   if (state != NULL && state->is_exception_detected()) {
     state->set_exception_caught();
   }
   thread->clear_pending_exception();
   DTRACE_PROBE(hotspot_jni, ExceptionClear__return);
 JNI_END
 JNI_ENTRY(void, jni_FatalError(JNIEnv *env, const char *msg))
   JNIWrapper("FatalError");
   DTRACE_PROBE2(hotspot_jni, FatalError__entry, env, msg);
   tty->print_cr("FATAL ERROR in native method: %s", msg);
   thread->print_stack();
   os::abort(); // Dump core and abort
 JNI_END
 JNI_ENTRY(jint, jni_PushLocalFrame(JNIEnv *env, jint capacity))
   JNIWrapper("PushLocalFrame");
   DTRACE_PROBE2(hotspot_jni, PushLocalFrame__entry, env, capacity);
   //%note jni_11
   if (capacity < 0 && capacity > MAX_REASONABLE_LOCAL_CAPACITY) {
     DTRACE_PROBE1(hotspot_jni, PushLocalFrame__return, JNI_ERR);
     return JNI_ERR;
   }
   JNIHandleBlock* old_handles = thread->active_handles();
   JNIHandleBlock* new_handles = JNIHandleBlock::allocate_block(thread);
   assert(new_handles != NULL, "should not be NULL");
   new_handles->set_pop_frame_link(old_handles);
   thread->set_active_handles(new_handles);
   jint ret = JNI_OK;
   DTRACE_PROBE1(hotspot_jni, PushLocalFrame__return, ret);
   return ret;
 JNI_END
 JNI_ENTRY(jobject, jni_PopLocalFrame(JNIEnv *env, jobject result))
   JNIWrapper("PopLocalFrame");
   DTRACE_PROBE2(hotspot_jni, PopLocalFrame__entry, env, result);
   //%note jni_11
   Handle result_handle(thread, JNIHandles::resolve(result));
   JNIHandleBlock* old_handles = thread->active_handles();
   JNIHandleBlock* new_handles = old_handles->pop_frame_link();
   if (new_handles != NULL) {
     // As a sanity check we only release the handle blocks if the pop_frame_link is not NULL.
     // This way code will still work if PopLocalFrame is called without a corresponding
     // PushLocalFrame call. Note that we set the pop_frame_link to NULL explicitly, otherwise
     // the release_block call will release the blocks.
     thread->set_active_handles(new_handles);
     old_handles->set_pop_frame_link(NULL);              // clear link we won't release new_handles below
     JNIHandleBlock::release_block(old_handles, thread); // may block
     result = JNIHandles::make_local(thread, result_handle());
   }
   DTRACE_PROBE1(hotspot_jni, PopLocalFrame__return, result);
   return result;
 JNI_END
 JNI_ENTRY(jobject, jni_NewGlobalRef(JNIEnv *env, jobject ref))
   JNIWrapper("NewGlobalRef");
   DTRACE_PROBE2(hotspot_jni, NewGlobalRef__entry, env, ref);
   Handle ref_handle(thread, JNIHandles::resolve(ref));
   jobject ret = JNIHandles::make_global(ref_handle);
   DTRACE_PROBE1(hotspot_jni, NewGlobalRef__return, ret);
   return ret;
 JNI_END
 // Must be JNI_ENTRY (with HandleMark)
 JNI_ENTRY_NO_PRESERVE(void, jni_DeleteGlobalRef(JNIEnv *env, jobject ref))
   JNIWrapper("DeleteGlobalRef");
   DTRACE_PROBE2(hotspot_jni, DeleteGlobalRef__entry, env, ref);
   JNIHandles::destroy_global(ref);
   DTRACE_PROBE(hotspot_jni, DeleteGlobalRef__return);
 JNI_END
 JNI_QUICK_ENTRY(void, jni_DeleteLocalRef(JNIEnv *env, jobject obj))
   JNIWrapper("DeleteLocalRef");
   DTRACE_PROBE2(hotspot_jni, DeleteLocalRef__entry, env, obj);
   JNIHandles::destroy_local(obj);
   DTRACE_PROBE(hotspot_jni, DeleteLocalRef__return);
 JNI_END
 JNI_QUICK_ENTRY(jboolean, jni_IsSameObject(JNIEnv *env, jobject r1, jobject r2))
   JNIWrapper("IsSameObject");
   DTRACE_PROBE3(hotspot_jni, IsSameObject__entry, env, r1, r2);
   oop a = JNIHandles::resolve(r1);
   oop b = JNIHandles::resolve(r2);
   jboolean ret = (a == b) ? JNI_TRUE : JNI_FALSE;
   DTRACE_PROBE1(hotspot_jni, IsSameObject__return, ret);
   return ret;
 JNI_END
 JNI_ENTRY(jobject, jni_NewLocalRef(JNIEnv *env, jobject ref))
   JNIWrapper("NewLocalRef");
   DTRACE_PROBE2(hotspot_jni, NewLocalRef__entry, env, ref);
   jobject ret = JNIHandles::make_local(env, JNIHandles::resolve(ref));
   DTRACE_PROBE1(hotspot_jni, NewLocalRef__return, ret);
   return ret;
 JNI_END
 JNI_LEAF(jint, jni_EnsureLocalCapacity(JNIEnv *env, jint capacity))
   JNIWrapper("EnsureLocalCapacity");
   DTRACE_PROBE2(hotspot_jni, EnsureLocalCapacity__entry, env, capacity);
   jint ret;
   if (capacity >= 0 && capacity <= MAX_REASONABLE_LOCAL_CAPACITY) {
     ret = JNI_OK;
   } else {
     ret = JNI_ERR;
   }
   DTRACE_PROBE1(hotspot_jni, EnsureLocalCapacity__return, ret);
   return ret;
 JNI_END
 // Return the Handle Type
 JNI_LEAF(jobjectRefType, jni_GetObjectRefType(JNIEnv *env, jobject obj))
   JNIWrapper("GetObjectRefType");
   DTRACE_PROBE2(hotspot_jni, GetObjectRefType__entry, env, obj);
   jobjectRefType ret;
   if (JNIHandles::is_local_handle(thread, obj) ||
       JNIHandles::is_frame_handle(thread, obj))
     ret = JNILocalRefType;
   else if (JNIHandles::is_global_handle(obj))
     ret = JNIGlobalRefType;
   else if (JNIHandles::is_weak_global_handle(obj))
     ret = JNIWeakGlobalRefType;
   else
     ret = JNIInvalidRefType;
   DTRACE_PROBE1(hotspot_jni, GetObjectRefType__return, ret);
   return ret;
 JNI_END
 class JNI_ArgumentPusher : public SignatureIterator {
  protected:
   JavaCallArguments*  _arguments;
   virtual void get_bool   () = 0;
   virtual void get_char   () = 0;
   virtual void get_short  () = 0;
   virtual void get_byte   () = 0;
   virtual void get_int    () = 0;
   virtual void get_long   () = 0;
   virtual void get_float  () = 0;
   virtual void get_double () = 0;
   virtual void get_object () = 0;
   JNI_ArgumentPusher(Thread *thread, symbolOop signature)
        : SignatureIterator(thread, signature) {
     this->_return_type = T_ILLEGAL;
     _arguments = NULL;
   }
  public:
   virtual void iterate( uint64_t fingerprint ) = 0;
   void set_java_argument_object(JavaCallArguments *arguments) { _arguments = arguments; }
   inline void do_bool()                     { if (!is_return_type()) get_bool();   }
   inline void do_char()                     { if (!is_return_type()) get_char();   }
   inline void do_short()                    { if (!is_return_type()) get_short();  }
   inline void do_byte()                     { if (!is_return_type()) get_byte();   }
   inline void do_int()                      { if (!is_return_type()) get_int();    }
   inline void do_long()                     { if (!is_return_type()) get_long();   }
   inline void do_float()                    { if (!is_return_type()) get_float();  }
   inline void do_double()                   { if (!is_return_type()) get_double(); }
   inline void do_object(int begin, int end) { if (!is_return_type()) get_object(); }
   inline void do_array(int begin, int end)  { if (!is_return_type()) get_object(); } // do_array uses get_object -- there is no get_array
   inline void do_void()                     { }
   JavaCallArguments* arguments()     { return _arguments; }
   void push_receiver(Handle h)       { _arguments->push_oop(h); }
 };
 class JNI_ArgumentPusherVaArg : public JNI_ArgumentPusher {
  protected:
   va_list _ap;
   inline void get_bool()   { _arguments->push_int(va_arg(_ap, jint)); } // bool is coerced to int when using va_arg
   inline void get_char()   { _arguments->push_int(va_arg(_ap, jint)); } // char is coerced to int when using va_arg
   inline void get_short()  { _arguments->push_int(va_arg(_ap, jint)); } // short is coerced to int when using va_arg
   inline void get_byte()   { _arguments->push_int(va_arg(_ap, jint)); } // byte is coerced to int when using va_arg
   inline void get_int()    { _arguments->push_int(va_arg(_ap, jint)); }
   // each of these paths is exercized by the various jck Call[Static,Nonvirtual,][Void,Int,..]Method[A,V,] tests
   inline void get_long()   { _arguments->push_long(va_arg(_ap, jlong)); }
   inline void get_float()  { _arguments->push_float((jfloat)va_arg(_ap, jdouble)); } // float is coerced to double w/ va_arg
   inline void get_double() { _arguments->push_double(va_arg(_ap, jdouble)); }
   inline void get_object() { jobject l = va_arg(_ap, jobject);
                              _arguments->push_oop(Handle((oop *)l, false)); }
   inline void set_ap(va_list rap) {
 #ifdef va_copy
     va_copy(_ap, rap);
 #elif defined (__va_copy)
     __va_copy(_ap, rap);
 #else
     _ap = rap;
 #endif
   }
  public:
   JNI_ArgumentPusherVaArg(Thread *thread, symbolOop signature, va_list rap)
        : JNI_ArgumentPusher(thread, signature) {
     set_ap(rap);
   }
   JNI_ArgumentPusherVaArg(Thread *thread, jmethodID method_id, va_list rap)
       : JNI_ArgumentPusher(thread, JNIHandles::resolve_jmethod_id(method_id)->signature()) {
     set_ap(rap);
   }
   // Optimized path if we have the bitvector form of signature
   void iterate( uint64_t fingerprint ) {
     if ( fingerprint == UCONST64(-1) ) SignatureIterator::iterate();// Must be too many arguments
     else {
       _return_type = (BasicType)((fingerprint >> static_feature_size) &
                                   result_feature_mask);
       assert(fingerprint, "Fingerprint should not be 0");
       fingerprint = fingerprint >> (static_feature_size + result_feature_size);
       while ( 1 ) {
         switch ( fingerprint & parameter_feature_mask ) {
           case bool_parm:
           case char_parm:
           case short_parm:
           case byte_parm:
           case int_parm:
             get_int();
             break;
           case obj_parm:
             get_object();
             break;
           case long_parm:
             get_long();
             break;
           case float_parm:
             get_float();
             break;
           case double_parm:
             get_double();
             break;
           case done_parm:
             return;
             break;
           default:
             ShouldNotReachHere();
             break;
         }
         fingerprint >>= parameter_feature_size;
       }
     }
   }
 };
 class JNI_ArgumentPusherArray : public JNI_ArgumentPusher {
  protected:
   const jvalue *_ap;
   inline void get_bool()   { _arguments->push_int((jint)(_ap++)->z); }
   inline void get_char()   { _arguments->push_int((jint)(_ap++)->c); }
   inline void get_short()  { _arguments->push_int((jint)(_ap++)->s); }
   inline void get_byte()   { _arguments->push_int((jint)(_ap++)->b); }
   inline void get_int()    { _arguments->push_int((jint)(_ap++)->i); }
   inline void get_long()   { _arguments->push_long((_ap++)->j);  }
   inline void get_float()  { _arguments->push_float((_ap++)->f); }
   inline void get_double() { _arguments->push_double((_ap++)->d);}
   inline void get_object() { _arguments->push_oop(Handle((oop *)(_ap++)->l, false)); }
   inline void set_ap(const jvalue *rap) { _ap = rap; }
  public:
   JNI_ArgumentPusherArray(Thread *thread, symbolOop signature, const jvalue *rap)
        : JNI_ArgumentPusher(thread, signature) {
     set_ap(rap);
   }
   JNI_ArgumentPusherArray(Thread *thread, jmethodID method_id, const jvalue *rap)
       : JNI_ArgumentPusher(thread, JNIHandles::resolve_jmethod_id(method_id)->signature()) {
     set_ap(rap);
   }
   // Optimized path if we have the bitvector form of signature
   void iterate( uint64_t fingerprint ) {
     if ( fingerprint == UCONST64(-1) ) SignatureIterator::iterate(); // Must be too many arguments
     else {
       _return_type = (BasicType)((fingerprint >> static_feature_size) &
                                   result_feature_mask);
       assert(fingerprint, "Fingerprint should not be 0");
       fingerprint = fingerprint >> (static_feature_size + result_feature_size);
       while ( 1 ) {
         switch ( fingerprint & parameter_feature_mask ) {
           case bool_parm:
             get_bool();
             break;
           case char_parm:
             get_char();
             break;
           case short_parm:
             get_short();
             break;
           case byte_parm:
             get_byte();
             break;
           case int_parm:
             get_int();
             break;
           case obj_parm:
             get_object();
             break;
           case long_parm:
             get_long();
             break;
           case float_parm:
             get_float();
             break;
           case double_parm:
             get_double();
             break;
           case done_parm:
             return;
             break;
           default:
             ShouldNotReachHere();
             break;
         }
         fingerprint >>= parameter_feature_size;
       }
     }
   }
 };
 enum JNICallType {
   JNI_STATIC,
   JNI_VIRTUAL,
   JNI_NONVIRTUAL
 };
 static methodHandle jni_resolve_interface_call(Handle recv, methodHandle method, TRAPS) {
   assert(!method.is_null() , "method should not be null");
   KlassHandle recv_klass; // Default to NULL (use of ?: can confuse gcc)
   if (recv.not_null()) recv_klass = KlassHandle(THREAD, recv->klass());
   KlassHandle spec_klass (THREAD, method->method_holder());
   symbolHandle name (THREAD, method->name());
   symbolHandle signature (THREAD, method->signature());
   CallInfo info;
   LinkResolver::resolve_interface_call(info, recv, recv_klass,  spec_klass, name, signature, KlassHandle(), false, true, CHECK_(methodHandle()));
   return info.selected_method();
 }
 static methodHandle jni_resolve_virtual_call(Handle recv, methodHandle method, TRAPS) {
   assert(!method.is_null() , "method should not be null");
   KlassHandle recv_klass; // Default to NULL (use of ?: can confuse gcc)
   if (recv.not_null()) recv_klass = KlassHandle(THREAD, recv->klass());
   KlassHandle spec_klass (THREAD, method->method_holder());
   symbolHandle name (THREAD, method->name());
   symbolHandle signature (THREAD, method->signature());
   CallInfo info;
   LinkResolver::resolve_virtual_call(info, recv, recv_klass,  spec_klass, name, signature, KlassHandle(), false, true, CHECK_(methodHandle()));
   return info.selected_method();
 }
 static void jni_invoke_static(JNIEnv *env, JavaValue* result, jobject receiver, JNICallType call_type, jmethodID method_id, JNI_ArgumentPusher *args, TRAPS) {
   methodHandle method(THREAD, JNIHandles::resolve_jmethod_id(method_id));
   // Create object to hold arguments for the JavaCall, and associate it with
   // the jni parser
   ResourceMark rm(THREAD);
   int number_of_parameters = method->size_of_parameters();
   JavaCallArguments java_args(number_of_parameters);
   args->set_java_argument_object(&java_args);
   assert(method->is_static(), "method should be static");
   // Fill out JavaCallArguments object
   args->iterate( Fingerprinter(THREAD, method).fingerprint() );
   // Initialize result type
   result->set_type(args->get_ret_type());
   // Invoke the method. Result is returned as oop.
   JavaCalls::call(result, method, &java_args, CHECK);
   // Convert result
   if (result->get_type() == T_OBJECT || result->get_type() == T_ARRAY) {
     result->set_jobject(JNIHandles::make_local(env, (oop) result->get_jobject()));
   }
 }
 static void jni_invoke_nonstatic(JNIEnv *env, JavaValue* result, jobject receiver, JNICallType call_type, jmethodID method_id, JNI_ArgumentPusher *args, TRAPS) {
   oop recv = JNIHandles::resolve(receiver);
   if (recv == NULL) {
     THROW(vmSymbols::java_lang_NullPointerException());
   }
   Handle h_recv(THREAD, recv);
   int number_of_parameters;
   methodOop selected_method;
   {
     methodOop m = JNIHandles::resolve_jmethod_id(method_id);
     number_of_parameters = m->size_of_parameters();
     klassOop holder = m->method_holder();
     if (!(Klass::cast(holder))->is_interface()) {
       // non-interface call -- for that little speed boost, don't handlize
       debug_only(No_Safepoint_Verifier nosafepoint;)
       if (call_type == JNI_VIRTUAL) {
         // jni_GetMethodID makes sure class is linked and initialized
         // so m should have a valid vtable index.
         int vtbl_index = m->vtable_index();
         if (vtbl_index != methodOopDesc::nonvirtual_vtable_index) {
           klassOop k = h_recv->klass();
           // k might be an arrayKlassOop but all vtables start at
           // the same place. The cast is to avoid virtual call and assertion.
           instanceKlass *ik = (instanceKlass*)k->klass_part();
           selected_method = ik->method_at_vtable(vtbl_index);
         } else {
           // final method
           selected_method = m;
         }
       } else {
         // JNI_NONVIRTUAL call
         selected_method = m;
       }
     } else {
       // interface call
       KlassHandle h_holder(THREAD, holder);
       int itbl_index = m->cached_itable_index();
       if (itbl_index == -1) {
         itbl_index = klassItable::compute_itable_index(m);
         m->set_cached_itable_index(itbl_index);
         // the above may have grabbed a lock, 'm' and anything non-handlized can't be used again
       }
       klassOop k = h_recv->klass();
       selected_method = instanceKlass::cast(k)->method_at_itable(h_holder(), itbl_index, CHECK);
     }
   }
   methodHandle method(THREAD, selected_method);
   // Create object to hold arguments for the JavaCall, and associate it with
   // the jni parser
   ResourceMark rm(THREAD);
   JavaCallArguments java_args(number_of_parameters);
   args->set_java_argument_object(&java_args);
   // handle arguments
   assert(!method->is_static(), "method should not be static");
   args->push_receiver(h_recv); // Push jobject handle
   // Fill out JavaCallArguments object
   args->iterate( Fingerprinter(THREAD, method).fingerprint() );
   // Initialize result type
   result->set_type(args->get_ret_type());
   // Invoke the method. Result is returned as oop.
   JavaCalls::call(result, method, &java_args, CHECK);
   // Convert result
   if (result->get_type() == T_OBJECT || result->get_type() == T_ARRAY) {
     result->set_jobject(JNIHandles::make_local(env, (oop) result->get_jobject()));
   }
 }
 static instanceOop alloc_object(jclass clazz, TRAPS) {
   KlassHandle k(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
   Klass::cast(k())->check_valid_for_instantiation(false, CHECK_NULL);
   instanceKlass::cast(k())->initialize(CHECK_NULL);
   instanceOop ih = instanceKlass::cast(k())->allocate_instance(THREAD);
   return ih;
 }
 DT_RETURN_MARK_DECL(AllocObject, jobject);
 JNI_ENTRY(jobject, jni_AllocObject(JNIEnv *env, jclass clazz))
   JNIWrapper("AllocObject");
   DTRACE_PROBE2(hotspot_jni, AllocObject__entry, env, clazz);
   jobject ret = NULL;
   DT_RETURN_MARK(AllocObject, jobject, (const jobject&)ret);
   instanceOop i = alloc_object(clazz, CHECK_NULL);
   ret = JNIHandles::make_local(env, i);
   return ret;
 JNI_END
 DT_RETURN_MARK_DECL(NewObjectA, jobject);
 JNI_ENTRY(jobject, jni_NewObjectA(JNIEnv *env, jclass clazz, jmethodID methodID, const jvalue *args))
   JNIWrapper("NewObjectA");
   DTRACE_PROBE3(hotspot_jni, NewObjectA__entry, env, clazz, methodID);
   jobject obj = NULL;
   DT_RETURN_MARK(NewObjectA, jobject, (const jobject)obj);
   instanceOop i = alloc_object(clazz, CHECK_NULL);
   obj = JNIHandles::make_local(env, i);
   JavaValue jvalue(T_VOID);
   JNI_ArgumentPusherArray ap(THREAD, methodID, args);
   jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_NULL);
   return obj;
 JNI_END
 DT_RETURN_MARK_DECL(NewObjectV, jobject);
 JNI_ENTRY(jobject, jni_NewObjectV(JNIEnv *env, jclass clazz, jmethodID methodID, va_list args))
   JNIWrapper("NewObjectV");
   DTRACE_PROBE3(hotspot_jni, NewObjectV__entry, env, clazz, methodID);
   jobject obj = NULL;
   DT_RETURN_MARK(NewObjectV, jobject, (const jobject&)obj);
   instanceOop i = alloc_object(clazz, CHECK_NULL);
   obj = JNIHandles::make_local(env, i);
   JavaValue jvalue(T_VOID);
   JNI_ArgumentPusherVaArg ap(THREAD, methodID, args);
   jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_NULL);
   return obj;
 JNI_END
 DT_RETURN_MARK_DECL(NewObject, jobject);
 JNI_ENTRY(jobject, jni_NewObject(JNIEnv *env, jclass clazz, jmethodID methodID, ...))
   JNIWrapper("NewObject");
   DTRACE_PROBE3(hotspot_jni, NewObject__entry, env, clazz, methodID);
   jobject obj = NULL;
   DT_RETURN_MARK(NewObject, jobject, (const jobject&)obj);
   instanceOop i = alloc_object(clazz, CHECK_NULL);
   obj = JNIHandles::make_local(env, i);
   va_list args;
   va_start(args, methodID);
   JavaValue jvalue(T_VOID);
   JNI_ArgumentPusherVaArg ap(THREAD, methodID, args);
   jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_NULL);
   va_end(args);
   return obj;
 JNI_END
 JNI_ENTRY(jclass, jni_GetObjectClass(JNIEnv *env, jobject obj))
   JNIWrapper("GetObjectClass");
   DTRACE_PROBE2(hotspot_jni, GetObjectClass__entry, env, obj);
   klassOop k = JNIHandles::resolve_non_null(obj)->klass();
   jclass ret =
     (jclass) JNIHandles::make_local(env, Klass::cast(k)->java_mirror());
   DTRACE_PROBE1(hotspot_jni, GetObjectClass__return, ret);
   return ret;
 JNI_END
 JNI_QUICK_ENTRY(jboolean, jni_IsInstanceOf(JNIEnv *env, jobject obj, jclass clazz))
   JNIWrapper("IsInstanceOf");
   DTRACE_PROBE3(hotspot_jni, IsInstanceOf__entry, env, obj, clazz);
   jboolean ret = JNI_TRUE;
   if (obj != NULL) {
     ret = JNI_FALSE;
     klassOop k = java_lang_Class::as_klassOop(
       JNIHandles::resolve_non_null(clazz));
     if (k != NULL) {
       ret = JNIHandles::resolve_non_null(obj)->is_a(k) ? JNI_TRUE : JNI_FALSE;
     }
   }
   DTRACE_PROBE1(hotspot_jni, IsInstanceOf__return, ret);
   return ret;
 JNI_END
 static jmethodID get_method_id(JNIEnv *env, jclass clazz, const char *name_str,
                                const char *sig, bool is_static, TRAPS) {
   // %%%% This code should probably just call into a method in the LinkResolver
   //
   // The class should have been loaded (we have an instance of the class
   // passed in) so the method and signature should already be in the symbol
   // table.  If they're not there, the method doesn't exist.
   symbolHandle signature =
            symbolHandle(THREAD, SymbolTable::probe(sig, (int)strlen(sig)));
   symbolHandle name;
   if (name_str == NULL) {
     name = vmSymbolHandles::object_initializer_name();
   } else {
     name = symbolHandle(THREAD,
                         SymbolTable::probe(name_str, (int)strlen(name_str)));
   }
   if (name.is_null() || signature.is_null()) {
     THROW_MSG_0(vmSymbols::java_lang_NoSuchMethodError(), name_str);
   }
   // Throw a NoSuchMethodError exception if we have an instance of a
   // primitive java.lang.Class
   if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(clazz))) {
     THROW_MSG_0(vmSymbols::java_lang_NoSuchMethodError(), name_str);
   }
   KlassHandle klass(THREAD,
                java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
   // Make sure class is linked and initialized before handing id's out to
   // methodOops.
   Klass::cast(klass())->initialize(CHECK_NULL);
   methodOop m;
   if (name() == vmSymbols::object_initializer_name() ||
       name() == vmSymbols::class_initializer_name()) {
     // Never search superclasses for constructors
     if (klass->oop_is_instance()) {
       m = instanceKlass::cast(klass())->find_method(name(), signature());
     } else {
       m = NULL;
     }
   } else {
     m = klass->lookup_method(name(), signature());
     // Look up interfaces
     if (m == NULL && klass->oop_is_instance()) {
       m = instanceKlass::cast(klass())->lookup_method_in_all_interfaces(name(),
                                                                    signature());
     }
   }
   if (m == NULL || (m->is_static() != is_static)) {
     THROW_MSG_0(vmSymbols::java_lang_NoSuchMethodError(), name_str);
   }
   return m->jmethod_id();
 }
 JNI_ENTRY(jmethodID, jni_GetMethodID(JNIEnv *env, jclass clazz,
           const char *name, const char *sig))
   JNIWrapper("GetMethodID");
   DTRACE_PROBE4(hotspot_jni, GetMethodID__entry, env, clazz, name, sig);
   jmethodID ret = get_method_id(env, clazz, name, sig, false, thread);
   DTRACE_PROBE1(hotspot_jni, GetMethodID__return, ret);
   return ret;
 JNI_END
 JNI_ENTRY(jmethodID, jni_GetStaticMethodID(JNIEnv *env, jclass clazz,
           const char *name, const char *sig))
   JNIWrapper("GetStaticMethodID");
   DTRACE_PROBE4(hotspot_jni, GetStaticMethodID__entry, env, clazz, name, sig);
   jmethodID ret = get_method_id(env, clazz, name, sig, true, thread);
   DTRACE_PROBE1(hotspot_jni, GetStaticMethodID__return, ret);
   return ret;
 JNI_END
 //
 // Calling Methods
 //
 #define DEFINE_CALLMETHOD(ResultType, Result, Tag) \
 \
   DT_RETURN_MARK_DECL_FOR(Result, Call##Result##Method, ResultType);\
   DT_RETURN_MARK_DECL_FOR(Result, Call##Result##MethodV, ResultType);\
   DT_RETURN_MARK_DECL_FOR(Result, Call##Result##MethodA, ResultType);\
 \
 JNI_ENTRY(ResultType, \
           jni_Call##Result##Method(JNIEnv *env, jobject obj, jmethodID methodID, ...)) \
   JNIWrapper("Call" XSTR(Result) "Method"); \
 \
   DTRACE_PROBE3(hotspot_jni, Call##Result##Method__entry, env, obj, methodID);\
   ResultType ret = 0;\
   DT_RETURN_MARK_FOR(Result, Call##Result##Method, ResultType, \
                      (const ResultType&)ret);\
 \
   va_list args; \
   va_start(args, methodID); \
   JavaValue jvalue(Tag); \
   JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); \
   jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK_0); \
   va_end(args); \
   ret = jvalue.get_##ResultType(); \
   return ret;\
 JNI_END \
 \
 \
 JNI_ENTRY(ResultType, \
           jni_Call##Result##MethodV(JNIEnv *env, jobject obj, jmethodID methodID, va_list args)) \
   JNIWrapper("Call" XSTR(Result) "MethodV"); \
 \
   DTRACE_PROBE3(hotspot_jni, Call##Result##MethodV__entry, env, obj, methodID);\
   ResultType ret = 0;\
   DT_RETURN_MARK_FOR(Result, Call##Result##MethodV, ResultType, \
                      (const ResultType&)ret);\
 \
   JavaValue jvalue(Tag); \
   JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); \
   jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK_0); \
   ret = jvalue.get_##ResultType(); \
   return ret;\
 JNI_END \
 \
 \
 JNI_ENTRY(ResultType, \
           jni_Call##Result##MethodA(JNIEnv *env, jobject obj, jmethodID methodID, const jvalue *args)) \
   JNIWrapper("Call" XSTR(Result) "MethodA"); \
   DTRACE_PROBE3(hotspot_jni, Call##Result##MethodA__entry, env, obj, methodID);\
   ResultType ret = 0;\
   DT_RETURN_MARK_FOR(Result, Call##Result##MethodA, ResultType, \
                      (const ResultType&)ret);\
 \
   JavaValue jvalue(Tag); \
   JNI_ArgumentPusherArray ap(THREAD, methodID, args); \
   jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK_0); \
   ret = jvalue.get_##ResultType(); \
   return ret;\
 JNI_END
 // the runtime type of subword integral basic types is integer
 DEFINE_CALLMETHOD(jboolean, Boolean, T_BOOLEAN)
 DEFINE_CALLMETHOD(jbyte,    Byte,    T_BYTE)
 DEFINE_CALLMETHOD(jchar,    Char,    T_CHAR)
 DEFINE_CALLMETHOD(jshort,   Short,   T_SHORT)
 DEFINE_CALLMETHOD(jobject,  Object,  T_OBJECT)
 DEFINE_CALLMETHOD(jint,     Int,     T_INT)
 DEFINE_CALLMETHOD(jlong,    Long,    T_LONG)
 DEFINE_CALLMETHOD(jfloat,   Float,   T_FLOAT)
 DEFINE_CALLMETHOD(jdouble,  Double,  T_DOUBLE)
 DT_VOID_RETURN_MARK_DECL(CallVoidMethod);
 DT_VOID_RETURN_MARK_DECL(CallVoidMethodV);
 DT_VOID_RETURN_MARK_DECL(CallVoidMethodA);
 JNI_ENTRY(void, jni_CallVoidMethod(JNIEnv *env, jobject obj, jmethodID methodID, ...))
   JNIWrapper("CallVoidMethod");
   DTRACE_PROBE3(hotspot_jni, CallVoidMethod__entry, env, obj, methodID);
   DT_VOID_RETURN_MARK(CallVoidMethod);
   va_list args;
   va_start(args, methodID);
   JavaValue jvalue(T_VOID);
   JNI_ArgumentPusherVaArg ap(THREAD, methodID, args);
   jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK);
   va_end(args);
 JNI_END
 JNI_ENTRY(void, jni_CallVoidMethodV(JNIEnv *env, jobject obj, jmethodID methodID, va_list args))
   JNIWrapper("CallVoidMethodV");
   DTRACE_PROBE3(hotspot_jni, CallVoidMethodV__entry, env, obj, methodID);
   DT_VOID_RETURN_MARK(CallVoidMethodV);
   JavaValue jvalue(T_VOID);
   JNI_ArgumentPusherVaArg ap(THREAD, methodID, args);
   jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK);
 JNI_END
 JNI_ENTRY(void, jni_CallVoidMethodA(JNIEnv *env, jobject obj, jmethodID methodID, const jvalue *args))
   JNIWrapper("CallVoidMethodA");
   DTRACE_PROBE3(hotspot_jni, CallVoidMethodA__entry, env, obj, methodID);
   DT_VOID_RETURN_MARK(CallVoidMethodA);
   JavaValue jvalue(T_VOID);
   JNI_ArgumentPusherArray ap(THREAD, methodID, args);
   jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK);
 JNI_END
 #define DEFINE_CALLNONVIRTUALMETHOD(ResultType, Result, Tag) \
 \
   DT_RETURN_MARK_DECL_FOR(Result, CallNonvirtual##Result##Method, ResultType);\
   DT_RETURN_MARK_DECL_FOR(Result, CallNonvirtual##Result##MethodV, ResultType);\
   DT_RETURN_MARK_DECL_FOR(Result, CallNonvirtual##Result##MethodA, ResultType);\
 \
 JNI_ENTRY(ResultType, \
           jni_CallNonvirtual##Result##Method(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, ...)) \
   JNIWrapper("CallNonvitual" XSTR(Result) "Method"); \
 \
   DTRACE_PROBE4(hotspot_jni, CallNonvirtual##Result##Method__entry, env, obj, cls, methodID);\
   ResultType ret;\
   DT_RETURN_MARK_FOR(Result, CallNonvirtual##Result##Method, ResultType, \
                      (const ResultType&)ret);\
 \
   va_list args; \
   va_start(args, methodID); \
   JavaValue jvalue(Tag); \
   JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); \
   jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_0); \
   va_end(args); \
   ret = jvalue.get_##ResultType(); \
   return ret;\
 JNI_END \
 \
 JNI_ENTRY(ResultType, \
           jni_CallNonvirtual##Result##MethodV(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, va_list args)) \
   JNIWrapper("CallNonvitual" XSTR(Result) "#MethodV"); \
   DTRACE_PROBE4(hotspot_jni, CallNonvirtual##Result##MethodV__entry, env, obj, cls, methodID);\
   ResultType ret;\
   DT_RETURN_MARK_FOR(Result, CallNonvirtual##Result##MethodV, ResultType, \
                      (const ResultType&)ret);\
 \
   JavaValue jvalue(Tag); \
   JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); \
   jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_0); \
   ret = jvalue.get_##ResultType(); \
   return ret;\
 JNI_END \
 \
 JNI_ENTRY(ResultType, \
           jni_CallNonvirtual##Result##MethodA(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, const jvalue *args)) \
   JNIWrapper("CallNonvitual" XSTR(Result) "MethodA"); \
   DTRACE_PROBE4(hotspot_jni, CallNonvirtual##Result##MethodA__entry, env, obj, cls, methodID);\
   ResultType ret;\
   DT_RETURN_MARK_FOR(Result, CallNonvirtual##Result##MethodA, ResultType, \
                      (const ResultType&)ret);\
 \
   JavaValue jvalue(Tag); \
   JNI_ArgumentPusherArray ap(THREAD, methodID, args); \
   jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_0); \
   ret = jvalue.get_##ResultType(); \
   return ret;\
 JNI_END
 // the runtime type of subword integral basic types is integer
 DEFINE_CALLNONVIRTUALMETHOD(jboolean, Boolean, T_BOOLEAN)
 DEFINE_CALLNONVIRTUALMETHOD(jbyte,    Byte,    T_BYTE)
 DEFINE_CALLNONVIRTUALMETHOD(jchar,    Char,    T_CHAR)
 DEFINE_CALLNONVIRTUALMETHOD(jshort,   Short,   T_SHORT)
 DEFINE_CALLNONVIRTUALMETHOD(jobject,  Object,  T_OBJECT)
 DEFINE_CALLNONVIRTUALMETHOD(jint,     Int,     T_INT)
 DEFINE_CALLNONVIRTUALMETHOD(jlong,    Long,    T_LONG)
 DEFINE_CALLNONVIRTUALMETHOD(jfloat,   Float,   T_FLOAT)
 DEFINE_CALLNONVIRTUALMETHOD(jdouble,  Double,  T_DOUBLE)
 DT_VOID_RETURN_MARK_DECL(CallNonvirtualVoidMethod);
 DT_VOID_RETURN_MARK_DECL(CallNonvirtualVoidMethodV);
 DT_VOID_RETURN_MARK_DECL(CallNonvirtualVoidMethodA);
 JNI_ENTRY(void, jni_CallNonvirtualVoidMethod(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, ...))
   JNIWrapper("CallNonvirtualVoidMethod");
   DTRACE_PROBE4(hotspot_jni, CallNonvirtualVoidMethod__entry,
                env, obj, cls, methodID);
   DT_VOID_RETURN_MARK(CallNonvirtualVoidMethod);
   va_list args;
   va_start(args, methodID);
   JavaValue jvalue(T_VOID);
   JNI_ArgumentPusherVaArg ap(THREAD, methodID, args);
   jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK);
   va_end(args);
 JNI_END
 JNI_ENTRY(void, jni_CallNonvirtualVoidMethodV(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, va_list args))
   JNIWrapper("CallNonvirtualVoidMethodV");
   DTRACE_PROBE4(hotspot_jni, CallNonvirtualVoidMethodV__entry,
                env, obj, cls, methodID);
   DT_VOID_RETURN_MARK(CallNonvirtualVoidMethodV);
   JavaValue jvalue(T_VOID);
   JNI_ArgumentPusherVaArg ap(THREAD, methodID, args);
   jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK);
 JNI_END
 JNI_ENTRY(void, jni_CallNonvirtualVoidMethodA(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, const jvalue *args))
   JNIWrapper("CallNonvirtualVoidMethodA");
   DTRACE_PROBE4(hotspot_jni, CallNonvirtualVoidMethodA__entry,
                 env, obj, cls, methodID);
   DT_VOID_RETURN_MARK(CallNonvirtualVoidMethodA);
   JavaValue jvalue(T_VOID);
   JNI_ArgumentPusherArray ap(THREAD, methodID, args);
   jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK);
 JNI_END
 #define DEFINE_CALLSTATICMETHOD(ResultType, Result, Tag) \
 \
   DT_RETURN_MARK_DECL_FOR(Result, CallStatic##Result##Method, ResultType);\
   DT_RETURN_MARK_DECL_FOR(Result, CallStatic##Result##MethodV, ResultType);\
   DT_RETURN_MARK_DECL_FOR(Result, CallStatic##Result##MethodA, ResultType);\
 \
 JNI_ENTRY(ResultType, \
           jni_CallStatic##Result##Method(JNIEnv *env, jclass cls, jmethodID methodID, ...)) \
   JNIWrapper("CallStatic" XSTR(Result) "Method"); \
 \
   DTRACE_PROBE3(hotspot_jni, CallStatic##Result##Method__entry, env, cls, methodID);\
   ResultType ret = 0;\
   DT_RETURN_MARK_FOR(Result, CallStatic##Result##Method, ResultType, \
                      (const ResultType&)ret);\
 \
   va_list args; \
   va_start(args, methodID); \
   JavaValue jvalue(Tag); \
   JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); \
   jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK_0); \
   va_end(args); \
   ret = jvalue.get_##ResultType(); \
   return ret;\
 JNI_END \
 \
 JNI_ENTRY(ResultType, \
           jni_CallStatic##Result##MethodV(JNIEnv *env, jclass cls, jmethodID methodID, va_list args)) \
   JNIWrapper("CallStatic" XSTR(Result) "MethodV"); \
   DTRACE_PROBE3(hotspot_jni, CallStatic##Result##MethodV__entry, env, cls, methodID);\
   ResultType ret = 0;\
   DT_RETURN_MARK_FOR(Result, CallStatic##Result##MethodV, ResultType, \
                      (const ResultType&)ret);\
 \
   JavaValue jvalue(Tag); \
   JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); \
   jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK_0); \
   ret = jvalue.get_##ResultType(); \
   return ret;\
 JNI_END \
 \
 JNI_ENTRY(ResultType, \
           jni_CallStatic##Result##MethodA(JNIEnv *env, jclass cls, jmethodID methodID, const jvalue *args)) \
   JNIWrapper("CallStatic" XSTR(Result) "MethodA"); \
   DTRACE_PROBE3(hotspot_jni, CallStatic##Result##MethodA__entry, env, cls, methodID);\
   ResultType ret = 0;\
   DT_RETURN_MARK_FOR(Result, CallStatic##Result##MethodA, ResultType, \
                      (const ResultType&)ret);\
 \
   JavaValue jvalue(Tag); \
   JNI_ArgumentPusherArray ap(THREAD, methodID, args); \
   jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK_0); \
   ret = jvalue.get_##ResultType(); \
   return ret;\
 JNI_END
 // the runtime type of subword integral basic types is integer
 DEFINE_CALLSTATICMETHOD(jboolean, Boolean, T_BOOLEAN)
 DEFINE_CALLSTATICMETHOD(jbyte,    Byte,    T_BYTE)
 DEFINE_CALLSTATICMETHOD(jchar,    Char,    T_CHAR)
 DEFINE_CALLSTATICMETHOD(jshort,   Short,   T_SHORT)
 DEFINE_CALLSTATICMETHOD(jobject,  Object,  T_OBJECT)
 DEFINE_CALLSTATICMETHOD(jint,     Int,     T_INT)
 DEFINE_CALLSTATICMETHOD(jlong,    Long,    T_LONG)
 DEFINE_CALLSTATICMETHOD(jfloat,   Float,   T_FLOAT)
 DEFINE_CALLSTATICMETHOD(jdouble,  Double,  T_DOUBLE)
 DT_VOID_RETURN_MARK_DECL(CallStaticVoidMethod);
 DT_VOID_RETURN_MARK_DECL(CallStaticVoidMethodV);
 DT_VOID_RETURN_MARK_DECL(CallStaticVoidMethodA);
 JNI_ENTRY(void, jni_CallStaticVoidMethod(JNIEnv *env, jclass cls, jmethodID methodID, ...))
   JNIWrapper("CallStaticVoidMethod");
   DTRACE_PROBE3(hotspot_jni, CallStaticVoidMethod__entry, env, cls, methodID);
   DT_VOID_RETURN_MARK(CallStaticVoidMethod);
   va_list args;
   va_start(args, methodID);
   JavaValue jvalue(T_VOID);
   JNI_ArgumentPusherVaArg ap(THREAD, methodID, args);
   jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK);
   va_end(args);
 JNI_END
 JNI_ENTRY(void, jni_CallStaticVoidMethodV(JNIEnv *env, jclass cls, jmethodID methodID, va_list args))
   JNIWrapper("CallStaticVoidMethodV");
   DTRACE_PROBE3(hotspot_jni, CallStaticVoidMethodV__entry, env, cls, methodID);
   DT_VOID_RETURN_MARK(CallStaticVoidMethodV);
   JavaValue jvalue(T_VOID);
   JNI_ArgumentPusherVaArg ap(THREAD, methodID, args);
   jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK);
 JNI_END
 JNI_ENTRY(void, jni_CallStaticVoidMethodA(JNIEnv *env, jclass cls, jmethodID methodID, const jvalue *args))
   JNIWrapper("CallStaticVoidMethodA");
   DTRACE_PROBE3(hotspot_jni, CallStaticVoidMethodA__entry, env, cls, methodID);
   DT_VOID_RETURN_MARK(CallStaticVoidMethodA);
   JavaValue jvalue(T_VOID);
   JNI_ArgumentPusherArray ap(THREAD, methodID, args);
   jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK);
 JNI_END
 //
 // Accessing Fields
 //
 DT_RETURN_MARK_DECL(GetFieldID, jfieldID);
 JNI_ENTRY(jfieldID, jni_GetFieldID(JNIEnv *env, jclass clazz,
           const char *name, const char *sig))
   JNIWrapper("GetFieldID");
   DTRACE_PROBE4(hotspot_jni, GetFieldID__entry, env, clazz, name, sig);
   jfieldID ret = 0;
   DT_RETURN_MARK(GetFieldID, jfieldID, (const jfieldID&)ret);
   // The class should have been loaded (we have an instance of the class
   // passed in) so the field and signature should already be in the symbol
   // table.  If they're not there, the field doesn't exist.
   symbolHandle fieldname =
             symbolHandle(THREAD, SymbolTable::probe(name, (int)strlen(name)));
   symbolHandle signame   =
             symbolHandle(THREAD, SymbolTable::probe(sig, (int)strlen(sig)));
   if (fieldname.is_null() || signame.is_null()) {
     THROW_MSG_0(vmSymbols::java_lang_NoSuchFieldError(), (char*) name);
   }
   KlassHandle k(THREAD,
                 java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
   // Make sure class is initialized before handing id's out to fields
   Klass::cast(k())->initialize(CHECK_NULL);
   fieldDescriptor fd;
   if (!Klass::cast(k())->oop_is_instance() ||
       !instanceKlass::cast(k())->find_field(fieldname(), signame(), false, &fd)) {
     THROW_MSG_0(vmSymbols::java_lang_NoSuchFieldError(), (char*) name);
   }
   // A jfieldID for a non-static field is simply the offset of the field within the instanceOop
   // It may also have hash bits for k, if VerifyJNIFields is turned on.
   ret = jfieldIDWorkaround::to_instance_jfieldID(k(), fd.offset());
   return ret;
 JNI_END
 JNI_ENTRY(jobject, jni_GetObjectField(JNIEnv *env, jobject obj, jfieldID fieldID))
   JNIWrapper("GetObjectField");
   DTRACE_PROBE3(hotspot_jni, GetObjectField__entry, env, obj, fieldID);
   oop o = JNIHandles::resolve_non_null(obj);
   klassOop k = o->klass();
   int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID);
   // Keep JVMTI addition small and only check enabled flag here.
   // jni_GetField_probe() assumes that is okay to create handles.
   if (JvmtiExport::should_post_field_access()) {
     o = JvmtiExport::jni_GetField_probe(thread, obj, o, k, fieldID, false);
   }
   jobject ret = JNIHandles::make_local(env, o->obj_field(offset));
   DTRACE_PROBE1(hotspot_jni, GetObjectField__return, ret);
   return ret;
 JNI_END
 #define DEFINE_GETFIELD(Return,Fieldname,Result) \
 \
   DT_RETURN_MARK_DECL_FOR(Result, Get##Result##Field, Return);\
 \
 JNI_QUICK_ENTRY(Return, jni_Get##Result##Field(JNIEnv *env, jobject obj, jfieldID fieldID)) \
   JNIWrapper("Get" XSTR(Result) "Field"); \
 \
   DTRACE_PROBE3(hotspot_jni, Get##Result##Field__entry, env, obj, fieldID);\
   Return ret = 0;\
   DT_RETURN_MARK_FOR(Result, Get##Result##Field, Return, (const Return&)ret);\
 \
   oop o = JNIHandles::resolve_non_null(obj); \
   klassOop k = o->klass(); \
   int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID);  \
   /* Keep JVMTI addition small and only check enabled flag here.       */ \
   /* jni_GetField_probe_nh() assumes that is not okay to create handles */ \
   /* and creates a ResetNoHandleMark.                                   */ \
   if (JvmtiExport::should_post_field_access()) { \
     o = JvmtiExport::jni_GetField_probe_nh(thread, obj, o, k, fieldID, false); \
   } \
   ret = o->Fieldname##_field(offset); \
   return ret; \
 JNI_END
 DEFINE_GETFIELD(jboolean, bool,   Boolean)
 DEFINE_GETFIELD(jbyte,    byte,   Byte)
 DEFINE_GETFIELD(jchar,    char,   Char)
 DEFINE_GETFIELD(jshort,   short,  Short)
 DEFINE_GETFIELD(jint,     int,    Int)
 DEFINE_GETFIELD(jlong,    long,   Long)
 DEFINE_GETFIELD(jfloat,   float,  Float)
 DEFINE_GETFIELD(jdouble,  double, Double)
 address jni_GetBooleanField_addr() {
   return (address)jni_GetBooleanField;
 }
 address jni_GetByteField_addr() {
   return (address)jni_GetByteField;
 }
 address jni_GetCharField_addr() {
   return (address)jni_GetCharField;
 }
 address jni_GetShortField_addr() {
   return (address)jni_GetShortField;
 }
 address jni_GetIntField_addr() {
   return (address)jni_GetIntField;
 }
 address jni_GetLongField_addr() {
   return (address)jni_GetLongField;
 }
 address jni_GetFloatField_addr() {
   return (address)jni_GetFloatField;
 }
 address jni_GetDoubleField_addr() {
   return (address)jni_GetDoubleField;
 }
 JNI_QUICK_ENTRY(void, jni_SetObjectField(JNIEnv *env, jobject obj, jfieldID fieldID, jobject value))
   JNIWrapper("SetObjectField");
   DTRACE_PROBE4(hotspot_jni, SetObjectField__entry, env, obj, fieldID, value);
   oop o = JNIHandles::resolve_non_null(obj);
   klassOop k = o->klass();
   int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID);
   // Keep JVMTI addition small and only check enabled flag here.
   // jni_SetField_probe_nh() assumes that is not okay to create handles
   // and creates a ResetNoHandleMark.
   if (JvmtiExport::should_post_field_modification()) {
     jvalue field_value;
     field_value.l = value;
     o = JvmtiExport::jni_SetField_probe_nh(thread, obj, o, k, fieldID, false, 'L', (jvalue *)&field_value);
   }
   o->obj_field_put(offset, JNIHandles::resolve(value));
   DTRACE_PROBE(hotspot_jni, SetObjectField__return);
 JNI_END
 #define DEFINE_SETFIELD(Argument,Fieldname,Result,SigType,unionType) \
 \
 JNI_QUICK_ENTRY(void, jni_Set##Result##Field(JNIEnv *env, jobject obj, jfieldID fieldID, Argument value)) \
   JNIWrapper("Set" XSTR(Result) "Field"); \
 \
   HS_DTRACE_PROBE_CDECL_N(hotspot_jni, Set##Result##Field__entry, \
     ( JNIEnv*, jobject, jfieldID FP_SELECT_##Result(COMMA Argument,/*empty*/) ) ); \
   HS_DTRACE_PROBE_N(hotspot_jni, Set##Result##Field__entry, \
     ( env, obj, fieldID FP_SELECT_##Result(COMMA value,/*empty*/) ) ); \
 \
   oop o = JNIHandles::resolve_non_null(obj); \
   klassOop k = o->klass(); \
   int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID);  \
   /* Keep JVMTI addition small and only check enabled flag here.       */ \
   /* jni_SetField_probe_nh() assumes that is not okay to create handles */ \
   /* and creates a ResetNoHandleMark.                                   */ \
   if (JvmtiExport::should_post_field_modification()) { \
     jvalue field_value; \
     field_value.unionType = value; \
     o = JvmtiExport::jni_SetField_probe_nh(thread, obj, o, k, fieldID, false, SigType, (jvalue *)&field_value); \
   } \
   o->Fieldname##_field_put(offset, value); \
   DTRACE_PROBE(hotspot_jni, Set##Result##Field__return);\
 JNI_END
 DEFINE_SETFIELD(jboolean, bool,   Boolean, 'Z', z)
 DEFINE_SETFIELD(jbyte,    byte,   Byte,    'B', b)
 DEFINE_SETFIELD(jchar,    char,   Char,    'C', c)
 DEFINE_SETFIELD(jshort,   short,  Short,   'S', s)
 DEFINE_SETFIELD(jint,     int,    Int,     'I', i)
 DEFINE_SETFIELD(jlong,    long,   Long,    'J', j)
 DEFINE_SETFIELD(jfloat,   float,  Float,   'F', f)
 DEFINE_SETFIELD(jdouble,  double, Double,  'D', d)
 DT_RETURN_MARK_DECL(ToReflectedField, jobject);
 JNI_ENTRY(jobject, jni_ToReflectedField(JNIEnv *env, jclass cls, jfieldID fieldID, jboolean isStatic))
   JNIWrapper("ToReflectedField");
   DTRACE_PROBE4(hotspot_jni, ToReflectedField__entry,
                 env, cls, fieldID, isStatic);
   jobject ret = NULL;
   DT_RETURN_MARK(ToReflectedField, jobject, (const jobject&)ret);
   fieldDescriptor fd;
   bool found = false;
   klassOop k = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(cls));
   assert(jfieldIDWorkaround::is_static_jfieldID(fieldID) == (isStatic != 0), "invalid fieldID");
   if (isStatic) {
     // Static field. The fieldID a JNIid specifying the field holder and the offset within the klassOop.
     JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID);
     assert(id->is_static_field_id(), "invalid static field id");
     found = instanceKlass::cast(id->holder())->find_local_field_from_offset(id->offset(), true, &fd);
   } else {
     // Non-static field. The fieldID is really the offset of the field within the instanceOop.
     int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID);
     found = instanceKlass::cast(k)->find_field_from_offset(offset, false, &fd);
   }
   assert(found, "bad fieldID passed into jni_ToReflectedField");
   oop reflected = Reflection::new_field(&fd, UseNewReflection, CHECK_NULL);
   ret = JNIHandles::make_local(env, reflected);
   return ret;
 JNI_END
 //
 // Accessing Static Fields
 //
 DT_RETURN_MARK_DECL(GetStaticFieldID, jfieldID);
 JNI_ENTRY(jfieldID, jni_GetStaticFieldID(JNIEnv *env, jclass clazz,
           const char *name, const char *sig))
   JNIWrapper("GetStaticFieldID");
   DTRACE_PROBE4(hotspot_jni, GetStaticFieldID__entry, env, clazz, name, sig);
   jfieldID ret = NULL;
   DT_RETURN_MARK(GetStaticFieldID, jfieldID, (const jfieldID&)ret);
   // The class should have been loaded (we have an instance of the class
   // passed in) so the field and signature should already be in the symbol
   // table.  If they're not there, the field doesn't exist.
   symbolHandle fieldname =
            symbolHandle(THREAD, SymbolTable::probe(name, (int)strlen(name)));
   symbolHandle signame   =
            symbolHandle(THREAD, SymbolTable::probe(sig, (int)strlen(sig)));
   if (fieldname.is_null() || signame.is_null()) {
     THROW_MSG_0(vmSymbols::java_lang_NoSuchFieldError(), (char*) name);
   }
   KlassHandle k(THREAD,
                 java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
   // Make sure class is initialized before handing id's out to static fields
   Klass::cast(k())->initialize(CHECK_NULL);
   fieldDescriptor fd;
   if (!Klass::cast(k())->oop_is_instance() ||
       !instanceKlass::cast(k())->find_field(fieldname(), signame(), true, &fd)) {
     THROW_MSG_0(vmSymbols::java_lang_NoSuchFieldError(), (char*) name);
   }
   // A jfieldID for a static field is a JNIid specifying the field holder and the offset within the klassOop
   JNIid* id = instanceKlass::cast(fd.field_holder())->jni_id_for(fd.offset());
   debug_only(id->set_is_static_field_id();)
   debug_only(int first_offset = instanceKlass::cast(fd.field_holder())->offset_of_static_fields();)
   debug_only(int end_offset = first_offset + (instanceKlass::cast(fd.field_holder())->static_field_size() * wordSize);)
   assert(id->offset() >= first_offset && id->offset() < end_offset, "invalid static field offset");
   ret = jfieldIDWorkaround::to_static_jfieldID(id);
   return ret;
 JNI_END
 JNI_ENTRY(jobject, jni_GetStaticObjectField(JNIEnv *env, jclass clazz, jfieldID fieldID))
   JNIWrapper("GetStaticObjectField");
   DTRACE_PROBE3(hotspot_jni, GetStaticObjectField__entry, env, clazz, fieldID);
 #ifndef JNICHECK_KERNEL
   DEBUG_ONLY(klassOop param_k = jniCheck::validate_class(thread, clazz);)
 #endif // JNICHECK_KERNEL
   JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID);
   assert(id->is_static_field_id(), "invalid static field id");
   // Keep JVMTI addition small and only check enabled flag here.
   // jni_GetField_probe() assumes that is okay to create handles.
   if (JvmtiExport::should_post_field_access()) {
     JvmtiExport::jni_GetField_probe(thread, NULL, NULL, id->holder(), fieldID, true);
   }
   jobject ret = JNIHandles::make_local(id->holder()->obj_field(id->offset()));
   DTRACE_PROBE1(hotspot_jni, GetStaticObjectField__return, ret);
   return ret;
 JNI_END
 #define DEFINE_GETSTATICFIELD(Return,Fieldname,Result) \
 \
   DT_RETURN_MARK_DECL_FOR(Result, GetStatic##Result##Field, Return);\
 \
 JNI_ENTRY(Return, jni_GetStatic##Result##Field(JNIEnv *env, jclass clazz, jfieldID fieldID)) \
   JNIWrapper("GetStatic" XSTR(Result) "Field"); \
   DTRACE_PROBE3(hotspot_jni, GetStatic##Result##Field__entry, env, clazz, fieldID);\
   Return ret = 0;\
   DT_RETURN_MARK_FOR(Result, GetStatic##Result##Field, Return, \
                      (const Return&)ret);\
   JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID); \
   assert(id->is_static_field_id(), "invalid static field id"); \
   /* Keep JVMTI addition small and only check enabled flag here. */ \
   /* jni_GetField_probe() assumes that is okay to create handles. */ \
   if (JvmtiExport::should_post_field_access()) { \
     JvmtiExport::jni_GetField_probe(thread, NULL, NULL, id->holder(), fieldID, true); \
   } \
   ret = id->holder()-> Fieldname##_field (id->offset()); \
   return ret;\
 JNI_END
 DEFINE_GETSTATICFIELD(jboolean, bool,   Boolean)
 DEFINE_GETSTATICFIELD(jbyte,    byte,   Byte)
 DEFINE_GETSTATICFIELD(jchar,    char,   Char)
 DEFINE_GETSTATICFIELD(jshort,   short,  Short)
 DEFINE_GETSTATICFIELD(jint,     int,    Int)
 DEFINE_GETSTATICFIELD(jlong,    long,   Long)
 DEFINE_GETSTATICFIELD(jfloat,   float,  Float)
 DEFINE_GETSTATICFIELD(jdouble,  double, Double)
 JNI_ENTRY(void, jni_SetStaticObjectField(JNIEnv *env, jclass clazz, jfieldID fieldID, jobject value))
   JNIWrapper("SetStaticObjectField");
   DTRACE_PROBE4(hotspot_jni, SetStaticObjectField__entry, env, clazz, fieldID, value);
   JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID);
   assert(id->is_static_field_id(), "invalid static field id");
   // Keep JVMTI addition small and only check enabled flag here.
   // jni_SetField_probe() assumes that is okay to create handles.
   if (JvmtiExport::should_post_field_modification()) {
     jvalue field_value;
     field_value.l = value;
     JvmtiExport::jni_SetField_probe(thread, NULL, NULL, id->holder(), fieldID, true, 'L', (jvalue *)&field_value);
   }
   id->holder()->obj_field_put(id->offset(), JNIHandles::resolve(value));
   DTRACE_PROBE(hotspot_jni, SetStaticObjectField__return);
 JNI_END
 #define DEFINE_SETSTATICFIELD(Argument,Fieldname,Result,SigType,unionType) \
 \
 JNI_ENTRY(void, jni_SetStatic##Result##Field(JNIEnv *env, jclass clazz, jfieldID fieldID, Argument value)) \
   JNIWrapper("SetStatic" XSTR(Result) "Field"); \
   HS_DTRACE_PROBE_CDECL_N(hotspot_jni, SetStatic##Result##Field__entry,\
     ( JNIEnv*, jclass, jfieldID FP_SELECT_##Result(COMMA Argument,/*empty*/) ) ); \
   HS_DTRACE_PROBE_N(hotspot_jni, SetStatic##Result##Field__entry, \
     ( env, clazz, fieldID FP_SELECT_##Result(COMMA value,/*empty*/) ) ); \
 \
   JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID); \
   assert(id->is_static_field_id(), "invalid static field id"); \
   /* Keep JVMTI addition small and only check enabled flag here. */ \
   /* jni_SetField_probe() assumes that is okay to create handles. */ \
   if (JvmtiExport::should_post_field_modification()) { \
     jvalue field_value; \
     field_value.unionType = value; \
     JvmtiExport::jni_SetField_probe(thread, NULL, NULL, id->holder(), fieldID, true, SigType, (jvalue *)&field_value); \
   } \
   id->holder()-> Fieldname##_field_put (id->offset(), value); \
   DTRACE_PROBE(hotspot_jni, SetStatic##Result##Field__return);\
 JNI_END
 DEFINE_SETSTATICFIELD(jboolean, bool,   Boolean, 'Z', z)
 DEFINE_SETSTATICFIELD(jbyte,    byte,   Byte,    'B', b)
 DEFINE_SETSTATICFIELD(jchar,    char,   Char,    'C', c)
 DEFINE_SETSTATICFIELD(jshort,   short,  Short,   'S', s)
 DEFINE_SETSTATICFIELD(jint,     int,    Int,     'I', i)
 DEFINE_SETSTATICFIELD(jlong,    long,   Long,    'J', j)
 DEFINE_SETSTATICFIELD(jfloat,   float,  Float,   'F', f)
 DEFINE_SETSTATICFIELD(jdouble,  double, Double,  'D', d)
 //
 // String Operations
 //
 // Unicode Interface
 DT_RETURN_MARK_DECL(NewString, jstring);
 JNI_ENTRY(jstring, jni_NewString(JNIEnv *env, const jchar *unicodeChars, jsize len))
   JNIWrapper("NewString");
   DTRACE_PROBE3(hotspot_jni, NewString__entry, env, unicodeChars, len);
   jstring ret = NULL;
   DT_RETURN_MARK(NewString, jstring, (const jstring&)ret);
   oop string=java_lang_String::create_oop_from_unicode((jchar*) unicodeChars, len, CHECK_NULL);
   ret = (jstring) JNIHandles::make_local(env, string);
   return ret;
 JNI_END
 JNI_QUICK_ENTRY(jsize, jni_GetStringLength(JNIEnv *env, jstring string))
   JNIWrapper("GetStringLength");
   DTRACE_PROBE2(hotspot_jni, GetStringLength__entry, env, string);
   jsize ret = java_lang_String::length(JNIHandles::resolve_non_null(string));
   DTRACE_PROBE1(hotspot_jni, GetStringLength__return, ret);
   return ret;
 JNI_END
 JNI_QUICK_ENTRY(const jchar*, jni_GetStringChars(
   JNIEnv *env, jstring string, jboolean *isCopy))
   JNIWrapper("GetStringChars");
   DTRACE_PROBE3(hotspot_jni, GetStringChars__entry, env, string, isCopy);
   //%note jni_5
   if (isCopy != NULL) {
     *isCopy = JNI_TRUE;
   }
   oop s = JNIHandles::resolve_non_null(string);
   int s_len = java_lang_String::length(s);
   typeArrayOop s_value = java_lang_String::value(s);
   int s_offset = java_lang_String::offset(s);
   jchar* buf = NEW_C_HEAP_ARRAY(jchar, s_len + 1);  // add one for zero termination
   if (s_len > 0) {
     memcpy(buf, s_value->char_at_addr(s_offset), sizeof(jchar)*s_len);
   }
   buf[s_len] = 0;
   DTRACE_PROBE1(hotspot_jni, GetStringChars__return, buf);
   return buf;
 JNI_END
 JNI_QUICK_ENTRY(void, jni_ReleaseStringChars(JNIEnv *env, jstring str, const jchar *chars))
   JNIWrapper("ReleaseStringChars");
   DTRACE_PROBE3(hotspot_jni, ReleaseStringChars__entry, env, str, chars);
   //%note jni_6
   if (chars != NULL) {
     // Since String objects are supposed to be immutable, don't copy any
     // new data back.  A bad user will have to go after the char array.
     FreeHeap((void*) chars);
   }
   DTRACE_PROBE(hotspot_jni, ReleaseStringChars__return);
 JNI_END
 // UTF Interface
 DT_RETURN_MARK_DECL(NewStringUTF, jstring);
 JNI_ENTRY(jstring, jni_NewStringUTF(JNIEnv *env, const char *bytes))
   JNIWrapper("NewStringUTF");
   DTRACE_PROBE2(hotspot_jni, NewStringUTF__entry, env, bytes);
   jstring ret;
   DT_RETURN_MARK(NewStringUTF, jstring, (const jstring&)ret);
   oop result = java_lang_String::create_oop_from_str((char*) bytes, CHECK_NULL);
   ret = (jstring) JNIHandles::make_local(env, result);
   return ret;
 JNI_END
 JNI_ENTRY(jsize, jni_GetStringUTFLength(JNIEnv *env, jstring string))
   JNIWrapper("GetStringUTFLength");
   DTRACE_PROBE2(hotspot_jni, GetStringUTFLength__entry, env, string);
   jsize ret = java_lang_String::utf8_length(JNIHandles::resolve_non_null(string));
   DTRACE_PROBE1(hotspot_jni, GetStringUTFLength__return, ret);
   return ret;
 JNI_END
 JNI_ENTRY(const char*, jni_GetStringUTFChars(JNIEnv *env, jstring string, jboolean *isCopy))
   JNIWrapper("GetStringUTFChars");
   DTRACE_PROBE3(hotspot_jni, GetStringUTFChars__entry, env, string, isCopy);
   ResourceMark rm;
   char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(string));
   int length = (int)strlen(str);
   char* result = AllocateHeap(length+1, "GetStringUTFChars");
   strcpy(result, str);
   if (isCopy != NULL) *isCopy = JNI_TRUE;
   DTRACE_PROBE1(hotspot_jni, GetStringUTFChars__return, result);
   return result;
 JNI_END
 JNI_LEAF(void, jni_ReleaseStringUTFChars(JNIEnv *env, jstring str, const char *chars))
   JNIWrapper("ReleaseStringUTFChars");
   DTRACE_PROBE3(hotspot_jni, ReleaseStringUTFChars__entry, env, str, chars);
   if (chars != NULL) {
     FreeHeap((char*) chars);
   }
   DTRACE_PROBE(hotspot_jni, ReleaseStringUTFChars__return);
 JNI_END
 JNI_QUICK_ENTRY(jsize, jni_GetArrayLength(JNIEnv *env, jarray array))
   JNIWrapper("GetArrayLength");
   DTRACE_PROBE2(hotspot_jni, GetArrayLength__entry, env, array);
   arrayOop a = arrayOop(JNIHandles::resolve_non_null(array));
   assert(a->is_array(), "must be array");
   jsize ret = a->length();
   DTRACE_PROBE1(hotspot_jni, GetArrayLength__return, ret);
   return ret;
 JNI_END
 //
 // Object Array Operations
 //
 DT_RETURN_MARK_DECL(NewObjectArray, jobjectArray);
 JNI_ENTRY(jobjectArray, jni_NewObjectArray(JNIEnv *env, jsize length, jclass elementClass, jobject initialElement))
   JNIWrapper("NewObjectArray");
   DTRACE_PROBE4(hotspot_jni, NewObjectArray__entry, env, length, elementClass, initialElement);
   jobjectArray ret = NULL;
   DT_RETURN_MARK(NewObjectArray, jobjectArray, (const jobjectArray&)ret);
   KlassHandle ek(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(elementClass)));
   klassOop ako = Klass::cast(ek())->array_klass(CHECK_NULL);
   KlassHandle ak = KlassHandle(THREAD, ako);
   objArrayKlass::cast(ak())->initialize(CHECK_NULL);
   objArrayOop result = objArrayKlass::cast(ak())->allocate(length, CHECK_NULL);
   oop initial_value = JNIHandles::resolve(initialElement);
   if (initial_value != NULL) {  // array already initialized with NULL
     for (int index = 0; index < length; index++) {
       result->obj_at_put(index, initial_value);
     }
   }
   ret = (jobjectArray) JNIHandles::make_local(env, result);
   return ret;
 JNI_END
 DT_RETURN_MARK_DECL(GetObjectArrayElement, jobject);
 JNI_ENTRY(jobject, jni_GetObjectArrayElement(JNIEnv *env, jobjectArray array, jsize index))
   JNIWrapper("GetObjectArrayElement");
   DTRACE_PROBE3(hotspot_jni, GetObjectArrayElement__entry, env, array, index);
   jobject ret = NULL;
   DT_RETURN_MARK(GetObjectArrayElement, jobject, (const jobject&)ret);
   objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(array));
   if (a->is_within_bounds(index)) {
     ret = JNIHandles::make_local(env, a->obj_at(index));
     return ret;
   } else {
     char buf[jintAsStringSize];
     sprintf(buf, "%d", index);
     THROW_MSG_0(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), buf);
   }
 JNI_END
 DT_VOID_RETURN_MARK_DECL(SetObjectArrayElement);
 JNI_ENTRY(void, jni_SetObjectArrayElement(JNIEnv *env, jobjectArray array, jsize index, jobject value))
   JNIWrapper("SetObjectArrayElement");
   DTRACE_PROBE4(hotspot_jni, SetObjectArrayElement__entry, env, array, index, value);
   DT_VOID_RETURN_MARK(SetObjectArrayElement);
   objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(array));
   oop v = JNIHandles::resolve(value);
   if (a->is_within_bounds(index)) {
     if (v == NULL || v->is_a(objArrayKlass::cast(a->klass())->element_klass())) {
       a->obj_at_put(index, v);
     } else {
       THROW(vmSymbols::java_lang_ArrayStoreException());
     }
   } else {
     char buf[jintAsStringSize];
     sprintf(buf, "%d", index);
     THROW_MSG(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), buf);
   }
 JNI_END
 #define DEFINE_NEWSCALARARRAY(Return,Allocator,Result) \
 \
   DT_RETURN_MARK_DECL(New##Result##Array, Return);\
 \
 JNI_ENTRY(Return, \
           jni_New##Result##Array(JNIEnv *env, jsize len)) \
   JNIWrapper("New" XSTR(Result) "Array"); \
   DTRACE_PROBE2(hotspot_jni, New##Result##Array__entry, env, len);\
   Return ret = NULL;\
   DT_RETURN_MARK(New##Result##Array, Return, (const Return&)ret);\
 \
   oop obj= oopFactory::Allocator(len, CHECK_0); \
   ret = (Return) JNIHandles::make_local(env, obj); \
   return ret;\
 JNI_END
 DEFINE_NEWSCALARARRAY(jbooleanArray, new_boolArray,   Boolean)
 DEFINE_NEWSCALARARRAY(jbyteArray,    new_byteArray,   Byte)
 DEFINE_NEWSCALARARRAY(jshortArray,   new_shortArray,  Short)
 DEFINE_NEWSCALARARRAY(jcharArray,    new_charArray,   Char)
 DEFINE_NEWSCALARARRAY(jintArray,     new_intArray,    Int)
 DEFINE_NEWSCALARARRAY(jlongArray,    new_longArray,   Long)
 DEFINE_NEWSCALARARRAY(jfloatArray,   new_singleArray, Float)
 DEFINE_NEWSCALARARRAY(jdoubleArray,  new_doubleArray, Double)
 // Return an address which will fault if the caller writes to it.
 static char* get_bad_address() {
   static char* bad_address = NULL;
   if (bad_address == NULL) {
     size_t size = os::vm_allocation_granularity();
     bad_address = os::reserve_memory(size);
     if (bad_address != NULL) {
       os::protect_memory(bad_address, size, os::MEM_PROT_READ,
                          /*is_committed*/false);
     }
   }
   return bad_address;
 }
 #define DEFINE_GETSCALARARRAYELEMENTS(ElementTag,ElementType,Result, Tag) \
 \
 JNI_QUICK_ENTRY(ElementType*, \
           jni_Get##Result##ArrayElements(JNIEnv *env, ElementType##Array array, jboolean *isCopy)) \
   JNIWrapper("Get" XSTR(Result) "ArrayElements"); \
   DTRACE_PROBE3(hotspot_jni, Get##Result##ArrayElements__entry, env, array, isCopy);\
   /* allocate an chunk of memory in c land */ \
   typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(array)); \
   ElementType* result; \
   int len = a->length(); \
   if (len == 0) { \
     /* Empty array: legal but useless, can't return NULL. \
      * Return a pointer to something useless. \
      * Avoid asserts in typeArrayOop. */ \
     result = (ElementType*)get_bad_address(); \
   } else { \
     result = NEW_C_HEAP_ARRAY(ElementType, len); \
     /* copy the array to the c chunk */ \
     memcpy(result, a->Tag##_at_addr(0), sizeof(ElementType)*len); \
   } \
   if (isCopy) *isCopy = JNI_TRUE; \
   DTRACE_PROBE1(hotspot_jni, Get##Result##ArrayElements__return, result);\
   return result; \
 JNI_END
 DEFINE_GETSCALARARRAYELEMENTS(T_BOOLEAN, jboolean, Boolean, bool)
 DEFINE_GETSCALARARRAYELEMENTS(T_BYTE,    jbyte,    Byte,    byte)
 DEFINE_GETSCALARARRAYELEMENTS(T_SHORT,   jshort,   Short,   short)
 DEFINE_GETSCALARARRAYELEMENTS(T_CHAR,    jchar,    Char,    char)
 DEFINE_GETSCALARARRAYELEMENTS(T_INT,     jint,     Int,     int)
 DEFINE_GETSCALARARRAYELEMENTS(T_LONG,    jlong,    Long,    long)
 DEFINE_GETSCALARARRAYELEMENTS(T_FLOAT,   jfloat,   Float,   float)
 DEFINE_GETSCALARARRAYELEMENTS(T_DOUBLE,  jdouble,  Double,  double)
 #define DEFINE_RELEASESCALARARRAYELEMENTS(ElementTag,ElementType,Result,Tag) \
 \
 JNI_QUICK_ENTRY(void, \
           jni_Release##Result##ArrayElements(JNIEnv *env, ElementType##Array array, \
                                              ElementType *buf, jint mode)) \
   JNIWrapper("Release" XSTR(Result) "ArrayElements"); \
   DTRACE_PROBE4(hotspot_jni, Release##Result##ArrayElements__entry, env, array, buf, mode);\
   typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(array)); \
   int len = a->length(); \
   if (len != 0) {   /* Empty array:  nothing to free or copy. */  \
     if ((mode == 0) || (mode == JNI_COMMIT)) { \
       memcpy(a->Tag##_at_addr(0), buf, sizeof(ElementType)*len); \
     } \
     if ((mode == 0) || (mode == JNI_ABORT)) { \
       FreeHeap(buf); \
     } \
   } \
   DTRACE_PROBE(hotspot_jni, Release##Result##ArrayElements__return);\
 JNI_END
 DEFINE_RELEASESCALARARRAYELEMENTS(T_BOOLEAN, jboolean, Boolean, bool)
 DEFINE_RELEASESCALARARRAYELEMENTS(T_BYTE,    jbyte,    Byte,    byte)
 DEFINE_RELEASESCALARARRAYELEMENTS(T_SHORT,   jshort,   Short,   short)
 DEFINE_RELEASESCALARARRAYELEMENTS(T_CHAR,    jchar,    Char,    char)
 DEFINE_RELEASESCALARARRAYELEMENTS(T_INT,     jint,     Int,     int)
 DEFINE_RELEASESCALARARRAYELEMENTS(T_LONG,    jlong,    Long,    long)
 DEFINE_RELEASESCALARARRAYELEMENTS(T_FLOAT,   jfloat,   Float,   float)
 DEFINE_RELEASESCALARARRAYELEMENTS(T_DOUBLE,  jdouble,  Double,  double)
 #define DEFINE_GETSCALARARRAYREGION(ElementTag,ElementType,Result, Tag) \
   DT_VOID_RETURN_MARK_DECL(Get##Result##ArrayRegion);\
 \
 JNI_ENTRY(void, \
 jni_Get##Result##ArrayRegion(JNIEnv *env, ElementType##Array array, jsize start, \
              jsize len, ElementType *buf)) \
   JNIWrapper("Get" XSTR(Result) "ArrayRegion"); \
   DTRACE_PROBE5(hotspot_jni, Get##Result##ArrayRegion__entry, env, array, start, len, buf);\
   DT_VOID_RETURN_MARK(Get##Result##ArrayRegion); \
   typeArrayOop src = typeArrayOop(JNIHandles::resolve_non_null(array)); \
   if (start < 0 || len < 0 || ((unsigned int)start + (unsigned int)len > (unsigned int)src->length())) { \
     THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException()); \
   } else { \
     if (len > 0) { \
       int sc = typeArrayKlass::cast(src->klass())->log2_element_size(); \
       memcpy((u_char*) buf, \
              (u_char*) src->Tag##_at_addr(start), \
              len << sc);                          \
     } \
   } \
 JNI_END
 DEFINE_GETSCALARARRAYREGION(T_BOOLEAN, jboolean,Boolean, bool)
 DEFINE_GETSCALARARRAYREGION(T_BYTE,    jbyte,   Byte,    byte)
 DEFINE_GETSCALARARRAYREGION(T_SHORT,   jshort,  Short,   short)
 DEFINE_GETSCALARARRAYREGION(T_CHAR,    jchar,   Char,    char)
 DEFINE_GETSCALARARRAYREGION(T_INT,     jint,    Int,     int)
 DEFINE_GETSCALARARRAYREGION(T_LONG,    jlong,   Long,    long)
 DEFINE_GETSCALARARRAYREGION(T_FLOAT,   jfloat,  Float,   float)
 DEFINE_GETSCALARARRAYREGION(T_DOUBLE,  jdouble, Double,  double)
 #define DEFINE_SETSCALARARRAYREGION(ElementTag,ElementType,Result, Tag) \
   DT_VOID_RETURN_MARK_DECL(Set##Result##ArrayRegion);\
 \
 JNI_ENTRY(void, \
 jni_Set##Result##ArrayRegion(JNIEnv *env, ElementType##Array array, jsize start, \
              jsize len, const ElementType *buf)) \
   JNIWrapper("Set" XSTR(Result) "ArrayRegion"); \
   DTRACE_PROBE5(hotspot_jni, Set##Result##ArrayRegion__entry, env, array, start, len, buf);\
   DT_VOID_RETURN_MARK(Set##Result##ArrayRegion); \
   typeArrayOop dst = typeArrayOop(JNIHandles::resolve_non_null(array)); \
   if (start < 0 || len < 0 || ((unsigned int)start + (unsigned int)len > (unsigned int)dst->length())) { \
     THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException()); \
   } else { \
     if (len > 0) { \
       int sc = typeArrayKlass::cast(dst->klass())->log2_element_size(); \
       memcpy((u_char*) dst->Tag##_at_addr(start), \
              (u_char*) buf, \
              len << sc);    \
     } \
   } \
 JNI_END
 DEFINE_SETSCALARARRAYREGION(T_BOOLEAN, jboolean, Boolean, bool)
 DEFINE_SETSCALARARRAYREGION(T_BYTE,    jbyte,    Byte,    byte)
 DEFINE_SETSCALARARRAYREGION(T_SHORT,   jshort,   Short,   short)
 DEFINE_SETSCALARARRAYREGION(T_CHAR,    jchar,    Char,    char)
 DEFINE_SETSCALARARRAYREGION(T_INT,     jint,     Int,     int)
 DEFINE_SETSCALARARRAYREGION(T_LONG,    jlong,    Long,    long)
 DEFINE_SETSCALARARRAYREGION(T_FLOAT,   jfloat,   Float,   float)
 DEFINE_SETSCALARARRAYREGION(T_DOUBLE,  jdouble,  Double,  double)
 //
 // Interception of natives
 //
 // The RegisterNatives call being attempted tried to register with a method that
 // is not native.  Ask JVM TI what prefixes have been specified.  Then check
 // to see if the native method is now wrapped with the prefixes.  See the
 // SetNativeMethodPrefix(es) functions in the JVM TI Spec for details.
 static methodOop find_prefixed_native(KlassHandle k,
                                       symbolHandle name, symbolHandle signature, TRAPS) {
   ResourceMark rm(THREAD);
   methodOop method;
   int name_len = name->utf8_length();
   char* name_str = name->as_utf8();
   int prefix_count;
   char** prefixes = JvmtiExport::get_all_native_method_prefixes(&prefix_count);
   for (int i = 0; i < prefix_count; i++) {
     char* prefix = prefixes[i];
     int prefix_len = (int)strlen(prefix);
     // try adding this prefix to the method name and see if it matches another method name
     int trial_len = name_len + prefix_len;
     char* trial_name_str = NEW_RESOURCE_ARRAY(char, trial_len + 1);
     strcpy(trial_name_str, prefix);
     strcat(trial_name_str, name_str);
     symbolHandle trial_name(THREAD, SymbolTable::probe(trial_name_str, trial_len));
     if (trial_name.is_null()) {
       continue; // no such symbol, so this prefix wasn't used, try the next prefix
     }
     method = Klass::cast(k())->lookup_method(trial_name(), signature());
     if (method == NULL) {
       continue; // signature doesn't match, try the next prefix
     }
     if (method->is_native()) {
       method->set_is_prefixed_native();
       return method; // wahoo, we found a prefixed version of the method, return it
     }
     // found as non-native, so prefix is good, add it, probably just need more prefixes
     name_len = trial_len;
     name_str = trial_name_str;
   }
   return NULL; // not found
 }
 static bool register_native(KlassHandle k, symbolHandle name, symbolHandle signature, address entry, TRAPS) {
   methodOop method = Klass::cast(k())->lookup_method(name(), signature());
   if (method == NULL) {
     ResourceMark rm;
     stringStream st;
     st.print("Method %s name or signature does not match",
              methodOopDesc::name_and_sig_as_C_string(Klass::cast(k()), name(), signature()));
     THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
   }
   if (!method->is_native()) {
     // trying to register to a non-native method, see if a JVM TI agent has added prefix(es)
     method = find_prefixed_native(k, name, signature, THREAD);
     if (method == NULL) {
       ResourceMark rm;
       stringStream st;
       st.print("Method %s is not declared as native",
                methodOopDesc::name_and_sig_as_C_string(Klass::cast(k()), name(), signature()));
       THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
     }
   }
   if (entry != NULL) {
     method->set_native_function(entry,
       methodOopDesc::native_bind_event_is_interesting);
   } else {
     method->clear_native_function();
   }
   if (PrintJNIResolving) {
     ResourceMark rm(THREAD);
     tty->print_cr("[Registering JNI native method %s.%s]",
       Klass::cast(method->method_holder())->external_name(),
       method->name()->as_C_string());
   }
   return true;
 }
 DT_RETURN_MARK_DECL(RegisterNatives, jint);
 JNI_ENTRY(jint, jni_RegisterNatives(JNIEnv *env, jclass clazz,
                                     const JNINativeMethod *methods,
                                     jint nMethods))
   JNIWrapper("RegisterNatives");
   DTRACE_PROBE4(hotspot_jni, RegisterNatives__entry, env, clazz, methods, nMethods);
   jint ret = 0;
   DT_RETURN_MARK(RegisterNatives, jint, (const jint&)ret);
   KlassHandle h_k(thread, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
   for (int index = 0; index < nMethods; index++) {
     const char* meth_name = methods[index].name;
     const char* meth_sig = methods[index].signature;
     int meth_name_len = (int)strlen(meth_name);
     // The class should have been loaded (we have an instance of the class
     // passed in) so the method and signature should already be in the symbol
     // table.  If they're not there, the method doesn't exist.
     symbolHandle name(THREAD, SymbolTable::probe(meth_name, meth_name_len));
     symbolHandle signature(THREAD, SymbolTable::probe(meth_sig, (int)strlen(meth_sig)));
     if (name.is_null() || signature.is_null()) {
       ResourceMark rm;
       stringStream st;
       st.print("Method %s.%s%s not found", Klass::cast(h_k())->external_name(), meth_name, meth_sig);
       // Must return negative value on failure
       THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), -1);
     }
     bool res = register_native(h_k, name, signature,
                                (address) methods[index].fnPtr, THREAD);
     if (!res) {
       ret = -1;
       break;
     }
   }
   return ret;
 JNI_END
 JNI_ENTRY(jint, jni_UnregisterNatives(JNIEnv *env, jclass clazz))
   JNIWrapper("UnregisterNatives");
   DTRACE_PROBE2(hotspot_jni, UnregisterNatives__entry, env, clazz);
   klassOop k   = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz));
   //%note jni_2
   if (Klass::cast(k)->oop_is_instance()) {
     for (int index = 0; index < instanceKlass::cast(k)->methods()->length(); index++) {
       methodOop m = methodOop(instanceKlass::cast(k)->methods()->obj_at(index));
       if (m->is_native()) {
         m->clear_native_function();
         m->set_signature_handler(NULL);
       }
     }
   }
   DTRACE_PROBE1(hotspot_jni, UnregisterNatives__return, 0);
   return 0;
 JNI_END
 //
 // Monitor functions
 //
 DT_RETURN_MARK_DECL(MonitorEnter, jint);
 JNI_ENTRY(jint, jni_MonitorEnter(JNIEnv *env, jobject jobj))
   DTRACE_PROBE2(hotspot_jni, MonitorEnter__entry, env, jobj);
   jint ret = JNI_ERR;
   DT_RETURN_MARK(MonitorEnter, jint, (const jint&)ret);
   // If the object is null, we can't do anything with it
   if (jobj == NULL) {
     THROW_(vmSymbols::java_lang_NullPointerException(), JNI_ERR);
   }
   Handle obj(thread, JNIHandles::resolve_non_null(jobj));
   ObjectSynchronizer::jni_enter(obj, CHECK_(JNI_ERR));
   ret = JNI_OK;
   return ret;
 JNI_END
 DT_RETURN_MARK_DECL(MonitorExit, jint);
 JNI_ENTRY(jint, jni_MonitorExit(JNIEnv *env, jobject jobj))
   DTRACE_PROBE2(hotspot_jni, MonitorExit__entry, env, jobj);
   jint ret = JNI_ERR;
   DT_RETURN_MARK(MonitorExit, jint, (const jint&)ret);
   // Don't do anything with a null object
   if (jobj == NULL) {
     THROW_(vmSymbols::java_lang_NullPointerException(), JNI_ERR);
   }
   Handle obj(THREAD, JNIHandles::resolve_non_null(jobj));
   ObjectSynchronizer::jni_exit(obj(), CHECK_(JNI_ERR));
   ret = JNI_OK;
   return ret;
 JNI_END
 //
 // Extensions
 //
 DT_VOID_RETURN_MARK_DECL(GetStringRegion);
 JNI_ENTRY(void, jni_GetStringRegion(JNIEnv *env, jstring string, jsize start, jsize len, jchar *buf))
   JNIWrapper("GetStringRegion");
   DTRACE_PROBE5(hotspot_jni, GetStringRegion__entry, env, string, start, len, buf);
   DT_VOID_RETURN_MARK(GetStringRegion);
   oop s = JNIHandles::resolve_non_null(string);
   int s_len = java_lang_String::length(s);
   if (start < 0 || len < 0 || start + len > s_len) {
     THROW(vmSymbols::java_lang_StringIndexOutOfBoundsException());
   } else {
     if (len > 0) {
       int s_offset = java_lang_String::offset(s);
       typeArrayOop s_value = java_lang_String::value(s);
       memcpy(buf, s_value->char_at_addr(s_offset+start), sizeof(jchar)*len);
     }
   }
 JNI_END
 DT_VOID_RETURN_MARK_DECL(GetStringUTFRegion);
 JNI_ENTRY(void, jni_GetStringUTFRegion(JNIEnv *env, jstring string, jsize start, jsize len, char *buf))
   JNIWrapper("GetStringUTFRegion");
   DTRACE_PROBE5(hotspot_jni, GetStringUTFRegion__entry, env, string, start, len, buf);
   DT_VOID_RETURN_MARK(GetStringUTFRegion);
   oop s = JNIHandles::resolve_non_null(string);
   int s_len = java_lang_String::length(s);
   if (start < 0 || len < 0 || start + len > s_len) {
     THROW(vmSymbols::java_lang_StringIndexOutOfBoundsException());
   } else {
     //%note jni_7
     if (len > 0) {
       ResourceMark rm(THREAD);
       char *utf_region = java_lang_String::as_utf8_string(s, start, len);
       int utf_len = (int)strlen(utf_region);
       memcpy(buf, utf_region, utf_len);
       buf[utf_len] = 0;
     } else {
       // JDK null-terminates the buffer even in len is zero
       if (buf != NULL) {
         buf[0] = 0;
       }
     }
   }
 JNI_END
 JNI_ENTRY(void*, jni_GetPrimitiveArrayCritical(JNIEnv *env, jarray array, jboolean *isCopy))
   JNIWrapper("GetPrimitiveArrayCritical");
   DTRACE_PROBE3(hotspot_jni, GetPrimitiveArrayCritical__entry, env, array, isCopy);
   GC_locker::lock_critical(thread);
   if (isCopy != NULL) {
     *isCopy = JNI_FALSE;
   }
   oop a = JNIHandles::resolve_non_null(array);
   assert(a->is_array(), "just checking");
   BasicType type;
   if (a->is_objArray()) {
     type = T_OBJECT;
   } else {
     type = typeArrayKlass::cast(a->klass())->element_type();
   }
   void* ret = arrayOop(a)->base(type);
   DTRACE_PROBE1(hotspot_jni, GetPrimitiveArrayCritical__return, ret);
   return ret;
 JNI_END
 JNI_ENTRY(void, jni_ReleasePrimitiveArrayCritical(JNIEnv *env, jarray array, void *carray, jint mode))
   JNIWrapper("ReleasePrimitiveArrayCritical");
   DTRACE_PROBE4(hotspot_jni, ReleasePrimitiveArrayCritical__entry, env, array, carray, mode);
   // The array, carray and mode arguments are ignored
   GC_locker::unlock_critical(thread);
   DTRACE_PROBE(hotspot_jni, ReleasePrimitiveArrayCritical__return);
 JNI_END
 JNI_ENTRY(const jchar*, jni_GetStringCritical(JNIEnv *env, jstring string, jboolean *isCopy))
   JNIWrapper("GetStringCritical");
   DTRACE_PROBE3(hotspot_jni, GetStringCritical__entry, env, string, isCopy);
   GC_locker::lock_critical(thread);
   if (isCopy != NULL) {
     *isCopy = JNI_FALSE;
   }
   oop s = JNIHandles::resolve_non_null(string);
   int s_len = java_lang_String::length(s);
   typeArrayOop s_value = java_lang_String::value(s);
   int s_offset = java_lang_String::offset(s);
   const jchar* ret;
   if (s_len > 0) {
     ret = s_value->char_at_addr(s_offset);
   } else {
     ret = (jchar*) s_value->base(T_CHAR);
   }
   DTRACE_PROBE1(hotspot_jni, GetStringCritical__return, ret);
   return ret;
 JNI_END
 JNI_ENTRY(void, jni_ReleaseStringCritical(JNIEnv *env, jstring str, const jchar *chars))
   JNIWrapper("ReleaseStringCritical");
   DTRACE_PROBE3(hotspot_jni, ReleaseStringCritical__entry, env, str, chars);
   // The str and chars arguments are ignored
   GC_locker::unlock_critical(thread);
   DTRACE_PROBE(hotspot_jni, ReleaseStringCritical__return);
 JNI_END
 JNI_ENTRY(jweak, jni_NewWeakGlobalRef(JNIEnv *env, jobject ref))
   JNIWrapper("jni_NewWeakGlobalRef");
   DTRACE_PROBE2(hotspot_jni, NewWeakGlobalRef__entry, env, ref);
   Handle ref_handle(thread, JNIHandles::resolve(ref));
   jweak ret = JNIHandles::make_weak_global(ref_handle);
   DTRACE_PROBE1(hotspot_jni, NewWeakGlobalRef__return, ret);
   return ret;
 JNI_END
 // Must be JNI_ENTRY (with HandleMark)
 JNI_ENTRY(void, jni_DeleteWeakGlobalRef(JNIEnv *env, jweak ref))
   JNIWrapper("jni_DeleteWeakGlobalRef");
   DTRACE_PROBE2(hotspot_jni, DeleteWeakGlobalRef__entry, env, ref);
   JNIHandles::destroy_weak_global(ref);
   DTRACE_PROBE(hotspot_jni, DeleteWeakGlobalRef__return);
 JNI_END
 JNI_QUICK_ENTRY(jboolean, jni_ExceptionCheck(JNIEnv *env))
   JNIWrapper("jni_ExceptionCheck");
   DTRACE_PROBE1(hotspot_jni, ExceptionCheck__entry, env);
   jni_check_async_exceptions(thread);
   jboolean ret = (thread->has_pending_exception()) ? JNI_TRUE : JNI_FALSE;
   DTRACE_PROBE1(hotspot_jni, ExceptionCheck__return, ret);
   return ret;
 JNI_END
 // Initialization state for three routines below relating to
 // java.nio.DirectBuffers
 static          jint directBufferSupportInitializeStarted = 0;
 static volatile jint directBufferSupportInitializeEnded   = 0;
 static volatile jint directBufferSupportInitializeFailed  = 0;
 static jclass    bufferClass                 = NULL;
 static jclass    directBufferClass           = NULL;
 static jclass    directByteBufferClass       = NULL;
 static jmethodID directByteBufferConstructor = NULL;
 static jfieldID  directBufferAddressField    = NULL;
 static jfieldID  bufferCapacityField         = NULL;
 static jclass lookupOne(JNIEnv* env, const char* name, TRAPS) {
   Handle loader;            // null (bootstrap) loader
   Handle protection_domain; // null protection domain
   symbolHandle sym = oopFactory::new_symbol_handle(name, CHECK_NULL);
   jclass result =  find_class_from_class_loader(env, sym, true, loader, protection_domain, true, CHECK_NULL);
   if (TraceClassResolution && result != NULL) {
     trace_class_resolution(java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(result)));
   }
   return result;
 }
 // These lookups are done with the NULL (bootstrap) ClassLoader to
 // circumvent any security checks that would be done by jni_FindClass.
 JNI_ENTRY(bool, lookupDirectBufferClasses(JNIEnv* env))
 {
   if ((bufferClass           = lookupOne(env, "java/nio/Buffer", thread))           == NULL) { return false; }
   if ((directBufferClass     = lookupOne(env, "sun/nio/ch/DirectBuffer", thread))   == NULL) { return false; }
   if ((directByteBufferClass = lookupOne(env, "java/nio/DirectByteBuffer", thread)) == NULL) { return false; }
   return true;
 }
 JNI_END
 static bool initializeDirectBufferSupport(JNIEnv* env, JavaThread* thread) {
   if (directBufferSupportInitializeFailed) {
     return false;
   }
   if (Atomic::cmpxchg(1, &directBufferSupportInitializeStarted, 0) == 0) {
     if (!lookupDirectBufferClasses(env)) {
       directBufferSupportInitializeFailed = 1;
       return false;
     }
     // Make global references for these
     bufferClass           = (jclass) env->NewGlobalRef(bufferClass);
     directBufferClass     = (jclass) env->NewGlobalRef(directBufferClass);
     directByteBufferClass = (jclass) env->NewGlobalRef(directByteBufferClass);
     // Get needed field and method IDs
     directByteBufferConstructor = env->GetMethodID(directByteBufferClass, "<init>", "(JI)V");
     directBufferAddressField    = env->GetFieldID(bufferClass, "address", "J");
     bufferCapacityField         = env->GetFieldID(bufferClass, "capacity", "I");
     if ((directByteBufferConstructor == NULL) ||
         (directBufferAddressField    == NULL) ||
         (bufferCapacityField         == NULL)) {
       directBufferSupportInitializeFailed = 1;
       return false;
     }
     directBufferSupportInitializeEnded = 1;
   } else {
     while (!directBufferSupportInitializeEnded && !directBufferSupportInitializeFailed) {
       // Set state as yield_all can call os:sleep. On Solaris, yield_all calls
       // os::sleep which requires the VM state transition. On other platforms, it
       // is not necessary. The following call to change the VM state is purposely
       // put inside the loop to avoid potential deadlock when multiple threads
       // try to call this method. See 6791815 for more details.
       ThreadInVMfromNative tivn(thread);
       os::yield_all();
     }
   }
   return !directBufferSupportInitializeFailed;
 }
 extern "C" jobject JNICALL jni_NewDirectByteBuffer(JNIEnv *env, void* address, jlong capacity)
 {
   // thread_from_jni_environment() will block if VM is gone.
   JavaThread* thread = JavaThread::thread_from_jni_environment(env);
   JNIWrapper("jni_NewDirectByteBuffer");
   DTRACE_PROBE3(hotspot_jni, NewDirectByteBuffer__entry, env, address, capacity);
   if (!directBufferSupportInitializeEnded) {
     if (!initializeDirectBufferSupport(env, thread)) {
       DTRACE_PROBE1(hotspot_jni, NewDirectByteBuffer__return, NULL);
       return NULL;
     }
   }
   // Being paranoid about accidental sign extension on address
   jlong addr = (jlong) ((uintptr_t) address);
   // NOTE that package-private DirectByteBuffer constructor currently
   // takes int capacity
   jint  cap  = (jint)  capacity;
   jobject ret = env->NewObject(directByteBufferClass, directByteBufferConstructor, addr, cap);
   DTRACE_PROBE1(hotspot_jni, NewDirectByteBuffer__return, ret);
   return ret;
 }
 DT_RETURN_MARK_DECL(GetDirectBufferAddress, void*);
 extern "C" void* JNICALL jni_GetDirectBufferAddress(JNIEnv *env, jobject buf)
 {
   // thread_from_jni_environment() will block if VM is gone.
   JavaThread* thread = JavaThread::thread_from_jni_environment(env);
   JNIWrapper("jni_GetDirectBufferAddress");
   DTRACE_PROBE2(hotspot_jni, GetDirectBufferAddress__entry, env, buf);
   void* ret = NULL;
   DT_RETURN_MARK(GetDirectBufferAddress, void*, (const void*&)ret);
   if (!directBufferSupportInitializeEnded) {
     if (!initializeDirectBufferSupport(env, thread)) {
       return 0;
     }
   }
   if ((buf != NULL) && (!env->IsInstanceOf(buf, directBufferClass))) {
     return 0;
   }
   ret = (void*)(intptr_t)env->GetLongField(buf, directBufferAddressField);
   return ret;
 }
 DT_RETURN_MARK_DECL(GetDirectBufferCapacity, jlong);
 extern "C" jlong JNICALL jni_GetDirectBufferCapacity(JNIEnv *env, jobject buf)
 {
   // thread_from_jni_environment() will block if VM is gone.
   JavaThread* thread = JavaThread::thread_from_jni_environment(env);
   JNIWrapper("jni_GetDirectBufferCapacity");
   DTRACE_PROBE2(hotspot_jni, GetDirectBufferCapacity__entry, env, buf);
   jlong ret = -1;
   DT_RETURN_MARK(GetDirectBufferCapacity, jlong, (const jlong&)ret);
   if (!directBufferSupportInitializeEnded) {
     if (!initializeDirectBufferSupport(env, thread)) {
       ret = 0;
       return ret;
     }
   }
   if (buf == NULL) {
     return -1;
   }
   if (!env->IsInstanceOf(buf, directBufferClass)) {
     return -1;
   }
   // NOTE that capacity is currently an int in the implementation
   ret = env->GetIntField(buf, bufferCapacityField);
   return ret;
 }
 JNI_LEAF(jint, jni_GetVersion(JNIEnv *env))
   JNIWrapper("GetVersion");
   DTRACE_PROBE1(hotspot_jni, GetVersion__entry, env);
   DTRACE_PROBE1(hotspot_jni, GetVersion__return, CurrentVersion);
   return CurrentVersion;
 JNI_END
 extern struct JavaVM_ main_vm;
 JNI_LEAF(jint, jni_GetJavaVM(JNIEnv *env, JavaVM **vm))
   JNIWrapper("jni_GetJavaVM");
   DTRACE_PROBE2(hotspot_jni, GetJavaVM__entry, env, vm);
   *vm  = (JavaVM *)(&main_vm);
   DTRACE_PROBE1(hotspot_jni, GetJavaVM__return, JNI_OK);
   return JNI_OK;
 JNI_END
 // Structure containing all jni functions
 struct JNINativeInterface_ jni_NativeInterface = {
     NULL,
     NULL,
     NULL,
     NULL,
     jni_GetVersion,
     jni_DefineClass,
     jni_FindClass,
     jni_FromReflectedMethod,
     jni_FromReflectedField,
     jni_ToReflectedMethod,
     jni_GetSuperclass,
     jni_IsAssignableFrom,
     jni_ToReflectedField,
     jni_Throw,
     jni_ThrowNew,
     jni_ExceptionOccurred,
     jni_ExceptionDescribe,
     jni_ExceptionClear,
     jni_FatalError,
     jni_PushLocalFrame,
     jni_PopLocalFrame,
     jni_NewGlobalRef,
     jni_DeleteGlobalRef,
     jni_DeleteLocalRef,
     jni_IsSameObject,
     jni_NewLocalRef,
     jni_EnsureLocalCapacity,
     jni_AllocObject,
     jni_NewObject,
     jni_NewObjectV,
     jni_NewObjectA,
     jni_GetObjectClass,
     jni_IsInstanceOf,
     jni_GetMethodID,
     jni_CallObjectMethod,
     jni_CallObjectMethodV,
     jni_CallObjectMethodA,
     jni_CallBooleanMethod,
     jni_CallBooleanMethodV,
     jni_CallBooleanMethodA,
     jni_CallByteMethod,
     jni_CallByteMethodV,
     jni_CallByteMethodA,
     jni_CallCharMethod,
     jni_CallCharMethodV,
     jni_CallCharMethodA,
     jni_CallShortMethod,
     jni_CallShortMethodV,
     jni_CallShortMethodA,
     jni_CallIntMethod,
     jni_CallIntMethodV,
     jni_CallIntMethodA,
     jni_CallLongMethod,
     jni_CallLongMethodV,
     jni_CallLongMethodA,
     jni_CallFloatMethod,
     jni_CallFloatMethodV,
     jni_CallFloatMethodA,
     jni_CallDoubleMethod,
     jni_CallDoubleMethodV,
     jni_CallDoubleMethodA,
     jni_CallVoidMethod,
     jni_CallVoidMethodV,
     jni_CallVoidMethodA,
     jni_CallNonvirtualObjectMethod,
     jni_CallNonvirtualObjectMethodV,
     jni_CallNonvirtualObjectMethodA,
     jni_CallNonvirtualBooleanMethod,
     jni_CallNonvirtualBooleanMethodV,
     jni_CallNonvirtualBooleanMethodA,
     jni_CallNonvirtualByteMethod,
     jni_CallNonvirtualByteMethodV,
     jni_CallNonvirtualByteMethodA,
     jni_CallNonvirtualCharMethod,
     jni_CallNonvirtualCharMethodV,
     jni_CallNonvirtualCharMethodA,
     jni_CallNonvirtualShortMethod,
     jni_CallNonvirtualShortMethodV,
     jni_CallNonvirtualShortMethodA,
     jni_CallNonvirtualIntMethod,
     jni_CallNonvirtualIntMethodV,
     jni_CallNonvirtualIntMethodA,
     jni_CallNonvirtualLongMethod,
     jni_CallNonvirtualLongMethodV,
     jni_CallNonvirtualLongMethodA,
     jni_CallNonvirtualFloatMethod,
     jni_CallNonvirtualFloatMethodV,
     jni_CallNonvirtualFloatMethodA,
     jni_CallNonvirtualDoubleMethod,
     jni_CallNonvirtualDoubleMethodV,
     jni_CallNonvirtualDoubleMethodA,
     jni_CallNonvirtualVoidMethod,
     jni_CallNonvirtualVoidMethodV,
     jni_CallNonvirtualVoidMethodA,
     jni_GetFieldID,
     jni_GetObjectField,
     jni_GetBooleanField,
     jni_GetByteField,
     jni_GetCharField,
     jni_GetShortField,
     jni_GetIntField,
     jni_GetLongField,
     jni_GetFloatField,
     jni_GetDoubleField,
     jni_SetObjectField,
     jni_SetBooleanField,
     jni_SetByteField,
     jni_SetCharField,
     jni_SetShortField,
     jni_SetIntField,
     jni_SetLongField,
     jni_SetFloatField,
     jni_SetDoubleField,
     jni_GetStaticMethodID,
     jni_CallStaticObjectMethod,
     jni_CallStaticObjectMethodV,
     jni_CallStaticObjectMethodA,
     jni_CallStaticBooleanMethod,
     jni_CallStaticBooleanMethodV,
     jni_CallStaticBooleanMethodA,
     jni_CallStaticByteMethod,
     jni_CallStaticByteMethodV,
     jni_CallStaticByteMethodA,
     jni_CallStaticCharMethod,
     jni_CallStaticCharMethodV,
     jni_CallStaticCharMethodA,
     jni_CallStaticShortMethod,
     jni_CallStaticShortMethodV,
     jni_CallStaticShortMethodA,
     jni_CallStaticIntMethod,
     jni_CallStaticIntMethodV,
     jni_CallStaticIntMethodA,
     jni_CallStaticLongMethod,
     jni_CallStaticLongMethodV,
     jni_CallStaticLongMethodA,
     jni_CallStaticFloatMethod,
     jni_CallStaticFloatMethodV,
     jni_CallStaticFloatMethodA,
     jni_CallStaticDoubleMethod,
     jni_CallStaticDoubleMethodV,
     jni_CallStaticDoubleMethodA,
     jni_CallStaticVoidMethod,
     jni_CallStaticVoidMethodV,
     jni_CallStaticVoidMethodA,
     jni_GetStaticFieldID,
     jni_GetStaticObjectField,
     jni_GetStaticBooleanField,
     jni_GetStaticByteField,
     jni_GetStaticCharField,
     jni_GetStaticShortField,
     jni_GetStaticIntField,
     jni_GetStaticLongField,
     jni_GetStaticFloatField,
     jni_GetStaticDoubleField,
     jni_SetStaticObjectField,
     jni_SetStaticBooleanField,
     jni_SetStaticByteField,
     jni_SetStaticCharField,
     jni_SetStaticShortField,
     jni_SetStaticIntField,
     jni_SetStaticLongField,
     jni_SetStaticFloatField,
     jni_SetStaticDoubleField,
     jni_NewString,
     jni_GetStringLength,
     jni_GetStringChars,
     jni_ReleaseStringChars,
     jni_NewStringUTF,
     jni_GetStringUTFLength,
     jni_GetStringUTFChars,
     jni_ReleaseStringUTFChars,
     jni_GetArrayLength,
     jni_NewObjectArray,
     jni_GetObjectArrayElement,
     jni_SetObjectArrayElement,
     jni_NewBooleanArray,
     jni_NewByteArray,
     jni_NewCharArray,
     jni_NewShortArray,
     jni_NewIntArray,
     jni_NewLongArray,
     jni_NewFloatArray,
     jni_NewDoubleArray,
     jni_GetBooleanArrayElements,
     jni_GetByteArrayElements,
     jni_GetCharArrayElements,
     jni_GetShortArrayElements,
     jni_GetIntArrayElements,
     jni_GetLongArrayElements,
     jni_GetFloatArrayElements,
     jni_GetDoubleArrayElements,
     jni_ReleaseBooleanArrayElements,
     jni_ReleaseByteArrayElements,
     jni_ReleaseCharArrayElements,
     jni_ReleaseShortArrayElements,
     jni_ReleaseIntArrayElements,
     jni_ReleaseLongArrayElements,
     jni_ReleaseFloatArrayElements,
     jni_ReleaseDoubleArrayElements,
     jni_GetBooleanArrayRegion,
     jni_GetByteArrayRegion,
     jni_GetCharArrayRegion,
     jni_GetShortArrayRegion,
     jni_GetIntArrayRegion,
     jni_GetLongArrayRegion,
     jni_GetFloatArrayRegion,
     jni_GetDoubleArrayRegion,
     jni_SetBooleanArrayRegion,
     jni_SetByteArrayRegion,
     jni_SetCharArrayRegion,
     jni_SetShortArrayRegion,
     jni_SetIntArrayRegion,
     jni_SetLongArrayRegion,
     jni_SetFloatArrayRegion,
     jni_SetDoubleArrayRegion,
     jni_RegisterNatives,
     jni_UnregisterNatives,
     jni_MonitorEnter,
     jni_MonitorExit,
     jni_GetJavaVM,
     jni_GetStringRegion,
     jni_GetStringUTFRegion,
     jni_GetPrimitiveArrayCritical,
     jni_ReleasePrimitiveArrayCritical,
     jni_GetStringCritical,
     jni_ReleaseStringCritical,
     jni_NewWeakGlobalRef,
     jni_DeleteWeakGlobalRef,
     jni_ExceptionCheck,
     jni_NewDirectByteBuffer,
     jni_GetDirectBufferAddress,
     jni_GetDirectBufferCapacity,
     // New 1_6 features
     jni_GetObjectRefType
 };
 // For jvmti use to modify jni function table.
 // Java threads in native contiues to run until it is transitioned
 // to VM at safepoint. Before the transition or before it is blocked
 // for safepoint it may access jni function table. VM could crash if
 // any java thread access the jni function table in the middle of memcpy.
 // To avoid this each function pointers are copied automically.
 void copy_jni_function_table(const struct JNINativeInterface_ *new_jni_NativeInterface) {
   assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
   intptr_t *a = (intptr_t *) jni_functions();
   intptr_t *b = (intptr_t *) new_jni_NativeInterface;
   for (uint i=0; i <  sizeof(struct JNINativeInterface_)/sizeof(void *); i++) {
     Atomic::store_ptr(*b++, a++);
   }
 }
 void quicken_jni_functions() {
   // Replace Get<Primitive>Field with fast versions
   if (UseFastJNIAccessors && !JvmtiExport::can_post_field_access()
       && !VerifyJNIFields && !TraceJNICalls && !CountJNICalls && !CheckJNICalls
 #if defined(_WINDOWS) && defined(IA32) && defined(COMPILER2)
       // windows x86 currently needs SEH wrapper and the gain of the fast
       // versions currently isn't certain for server vm on uniprocessor.
       && os::is_MP()
 #endif
   ) {
     address func;
     func = JNI_FastGetField::generate_fast_get_boolean_field();
     if (func != (address)-1) {
       jni_NativeInterface.GetBooleanField = (GetBooleanField_t)func;
     }
     func = JNI_FastGetField::generate_fast_get_byte_field();
     if (func != (address)-1) {
       jni_NativeInterface.GetByteField = (GetByteField_t)func;
     }
     func = JNI_FastGetField::generate_fast_get_char_field();
     if (func != (address)-1) {
       jni_NativeInterface.GetCharField = (GetCharField_t)func;
     }
     func = JNI_FastGetField::generate_fast_get_short_field();
     if (func != (address)-1) {
       jni_NativeInterface.GetShortField = (GetShortField_t)func;
     }
     func = JNI_FastGetField::generate_fast_get_int_field();
     if (func != (address)-1) {
       jni_NativeInterface.GetIntField = (GetIntField_t)func;
     }
     func = JNI_FastGetField::generate_fast_get_long_field();
     if (func != (address)-1) {
       jni_NativeInterface.GetLongField = (GetLongField_t)func;
     }
     func = JNI_FastGetField::generate_fast_get_float_field();
     if (func != (address)-1) {
       jni_NativeInterface.GetFloatField = (GetFloatField_t)func;
     }
     func = JNI_FastGetField::generate_fast_get_double_field();
     if (func != (address)-1) {
       jni_NativeInterface.GetDoubleField = (GetDoubleField_t)func;
     }
   }
 }
 // Returns the function structure
 struct JNINativeInterface_* jni_functions() {
 #ifndef JNICHECK_KERNEL
   if (CheckJNICalls) return jni_functions_check();
 #else  // JNICHECK_KERNEL
   if (CheckJNICalls) warning("-Xcheck:jni is not supported in kernel vm.");
 #endif // JNICHECK_KERNEL
   return &jni_NativeInterface;
 }
 // Returns the function structure
 struct JNINativeInterface_* jni_functions_nocheck() {
   return &jni_NativeInterface;
 }
 // Invocation API
 // Forward declaration
 extern const struct JNIInvokeInterface_ jni_InvokeInterface;
 // Global invocation API vars
 volatile jint vm_created = 0;
 // Indicate whether it is safe to recreate VM
 volatile jint safe_to_recreate_vm = 1;
 struct JavaVM_ main_vm = {&jni_InvokeInterface};
 #define JAVASTACKSIZE (400 * 1024)    /* Default size of a thread java stack */
 enum { VERIFY_NONE, VERIFY_REMOTE, VERIFY_ALL };
 HS_DTRACE_PROBE_DECL1(hotspot_jni, GetDefaultJavaVMInitArgs__entry, void*);
 DT_RETURN_MARK_DECL(GetDefaultJavaVMInitArgs, jint);
 _JNI_IMPORT_OR_EXPORT_ jint JNICALL JNI_GetDefaultJavaVMInitArgs(void *args_) {
   HS_DTRACE_PROBE1(hotspot_jni, GetDefaultJavaVMInitArgs__entry, args_);
   JDK1_1InitArgs *args = (JDK1_1InitArgs *)args_;
   jint ret = JNI_ERR;
   DT_RETURN_MARK(GetDefaultJavaVMInitArgs, jint, (const jint&)ret);
   if (Threads::is_supported_jni_version(args->version)) {
     ret = JNI_OK;
   }
   // 1.1 style no longer supported in hotspot.
   // According the JNI spec, we should update args->version on return.
   // We also use the structure to communicate with launcher about default
   // stack size.
   if (args->version == JNI_VERSION_1_1) {
     args->version = JNI_VERSION_1_2;
     // javaStackSize is int in arguments structure
     assert(jlong(ThreadStackSize) * K < INT_MAX, "integer overflow");
     args->javaStackSize = (jint)(ThreadStackSize * K);
   }
   return ret;
 }
 HS_DTRACE_PROBE_DECL3(hotspot_jni, CreateJavaVM__entry, vm, penv, args);
 DT_RETURN_MARK_DECL(CreateJavaVM, jint);
 _JNI_IMPORT_OR_EXPORT_ jint JNICALL JNI_CreateJavaVM(JavaVM **vm, void **penv, void *args) {
   HS_DTRACE_PROBE3(hotspot_jni, CreateJavaVM__entry, vm, penv, args);
   jint result = JNI_ERR;
   DT_RETURN_MARK(CreateJavaVM, jint, (const jint&)result);
   // We're about to use Atomic::xchg for synchronization.  Some Zero
   // platforms use the GCC builtin __sync_lock_test_and_set for this,
   // but __sync_lock_test_and_set is not guaranteed to do what we want
   // on all architectures.  So we check it works before relying on it.
 #if defined(ZERO) && defined(ASSERT)
   {
     jint a = 0xcafebabe;
     jint b = Atomic::xchg(0xdeadbeef, &a);
     void *c = &a;
     void *d = Atomic::xchg_ptr(&b, &c);
     assert(a == (jint) 0xdeadbeef && b == (jint) 0xcafebabe, "Atomic::xchg() works");
     assert(c == &b && d == &a, "Atomic::xchg_ptr() works");
   }
 #endif // ZERO && ASSERT
   // At the moment it's only possible to have one Java VM,
   // since some of the runtime state is in global variables.
   // We cannot use our mutex locks here, since they only work on
   // Threads. We do an atomic compare and exchange to ensure only
   // one thread can call this method at a time
   // We use Atomic::xchg rather than Atomic::add/dec since on some platforms
   // the add/dec implementations are dependent on whether we are running
   // on a multiprocessor, and at this stage of initialization the os::is_MP
   // function used to determine this will always return false. Atomic::xchg
   // does not have this problem.
   if (Atomic::xchg(1, &vm_created) == 1) {
     return JNI_ERR;   // already created, or create attempt in progress
   }
   if (Atomic::xchg(0, &safe_to_recreate_vm) == 0) {
     return JNI_ERR;  // someone tried and failed and retry not allowed.
   }
   assert(vm_created == 1, "vm_created is true during the creation");
   /**
    * Certain errors during initialization are recoverable and do not
    * prevent this method from being called again at a later time
    * (perhaps with different arguments).  However, at a certain
    * point during initialization if an error occurs we cannot allow
    * this function to be called again (or it will crash).  In those
    * situations, the 'canTryAgain' flag is set to false, which atomically
    * sets safe_to_recreate_vm to 1, such that any new call to
    * JNI_CreateJavaVM will immediately fail using the above logic.
    */
   bool can_try_again = true;
   result = Threads::create_vm((JavaVMInitArgs*) args, &can_try_again);
   if (result == JNI_OK) {
     JavaThread *thread = JavaThread::current();
     /* thread is thread_in_vm here */
     *vm = (JavaVM *)(&main_vm);
     *(JNIEnv**)penv = thread->jni_environment();
     // Tracks the time application was running before GC
     RuntimeService::record_application_start();
     // Notify JVMTI
     if (JvmtiExport::should_post_thread_life()) {
        JvmtiExport::post_thread_start(thread);
     }
     // Check if we should compile all classes on bootclasspath
     NOT_PRODUCT(if (CompileTheWorld) ClassLoader::compile_the_world();)
     // Since this is not a JVM_ENTRY we have to set the thread state manually before leaving.
     ThreadStateTransition::transition_and_fence(thread, _thread_in_vm, _thread_in_native);
   } else {
     if (can_try_again) {
       // reset safe_to_recreate_vm to 1 so that retrial would be possible
       safe_to_recreate_vm = 1;
     }
     // Creation failed. We must reset vm_created
     *vm = 0;
     *(JNIEnv**)penv = 0;
     // reset vm_created last to avoid race condition. Use OrderAccess to
     // control both compiler and architectural-based reordering.
     OrderAccess::release_store(&vm_created, 0);
   }
   NOT_PRODUCT(test_error_handler(ErrorHandlerTest));
   return result;
 }
 HS_DTRACE_PROBE_DECL3(hotspot_jni, GetCreatedJavaVMs__entry, \
   JavaVM**, jsize, jsize*);
 HS_DTRACE_PROBE_DECL1(hotspot_jni, GetCreatedJavaVMs__return, jint);
 _JNI_IMPORT_OR_EXPORT_ jint JNICALL JNI_GetCreatedJavaVMs(JavaVM **vm_buf, jsize bufLen, jsize *numVMs) {
   // See bug 4367188, the wrapper can sometimes cause VM crashes
   // JNIWrapper("GetCreatedJavaVMs");
   HS_DTRACE_PROBE3(hotspot_jni, GetCreatedJavaVMs__entry, \
     vm_buf, bufLen, numVMs);
   if (vm_created) {
     if (numVMs != NULL) *numVMs = 1;
     if (bufLen > 0)     *vm_buf = (JavaVM *)(&main_vm);
   } else {
     if (numVMs != NULL) *numVMs = 0;
   }
   HS_DTRACE_PROBE1(hotspot_jni, GetCreatedJavaVMs__return, JNI_OK);
   return JNI_OK;
 }
 extern "C" {
 DT_RETURN_MARK_DECL(DestroyJavaVM, jint);
 jint JNICALL jni_DestroyJavaVM(JavaVM *vm) {
   DTRACE_PROBE1(hotspot_jni, DestroyJavaVM__entry, vm);
   jint res = JNI_ERR;
   DT_RETURN_MARK(DestroyJavaVM, jint, (const jint&)res);
   if (!vm_created) {
     res = JNI_ERR;
     return res;
   }
   JNIWrapper("DestroyJavaVM");
   JNIEnv *env;
   JavaVMAttachArgs destroyargs;
   destroyargs.version = CurrentVersion;
   destroyargs.name = (char *)"DestroyJavaVM";
   destroyargs.group = NULL;
   res = vm->AttachCurrentThread((void **)&env, (void *)&destroyargs);
   if (res != JNI_OK) {
     return res;
   }
   // Since this is not a JVM_ENTRY we have to set the thread state manually before entering.
   JavaThread* thread = JavaThread::current();
   ThreadStateTransition::transition_from_native(thread, _thread_in_vm);
   if (Threads::destroy_vm()) {
     // Should not change thread state, VM is gone
     vm_created = false;
     res = JNI_OK;
     return res;
   } else {
     ThreadStateTransition::transition_and_fence(thread, _thread_in_vm, _thread_in_native);
     res = JNI_ERR;
     return res;
   }
 }
 static jint attach_current_thread(JavaVM *vm, void **penv, void *_args, bool daemon) {
   JavaVMAttachArgs *args = (JavaVMAttachArgs *) _args;
   // Check below commented out from JDK1.2fcs as well
   /*
   if (args && (args->version != JNI_VERSION_1_1 || args->version != JNI_VERSION_1_2)) {
     return JNI_EVERSION;
   }
   */
   Thread* t = ThreadLocalStorage::get_thread_slow();
   if (t != NULL) {
     // If the thread has been attached this operation is a no-op
     *(JNIEnv**)penv = ((JavaThread*) t)->jni_environment();
     return JNI_OK;
   }
   // Create a thread and mark it as attaching so it will be skipped by the
   // ThreadsListEnumerator - see CR 6404306
   JavaThread* thread = new JavaThread(true);
   // Set correct safepoint info. The thread is going to call into Java when
   // initializing the Java level thread object. Hence, the correct state must
   // be set in order for the Safepoint code to deal with it correctly.
   thread->set_thread_state(_thread_in_vm);
   // Must do this before initialize_thread_local_storage
   thread->record_stack_base_and_size();
   thread->initialize_thread_local_storage();
   if (!os::create_attached_thread(thread)) {
     delete thread;
     return JNI_ERR;
   }
   // Enable stack overflow checks
   thread->create_stack_guard_pages();
   thread->initialize_tlab();
   thread->cache_global_variables();
   // Crucial that we do not have a safepoint check for this thread, since it has
   // not been added to the Thread list yet.
   { Threads_lock->lock_without_safepoint_check();
     // This must be inside this lock in order to get FullGCALot to work properly, i.e., to
     // avoid this thread trying to do a GC before it is added to the thread-list
     thread->set_active_handles(JNIHandleBlock::allocate_block());
     Threads::add(thread, daemon);
     Threads_lock->unlock();
   }
   // Create thread group and name info from attach arguments
   oop group = NULL;
   char* thread_name = NULL;
   if (args != NULL && Threads::is_supported_jni_version(args->version)) {
     group = JNIHandles::resolve(args->group);
     thread_name = args->name; // may be NULL
   }
   if (group == NULL) group = Universe::main_thread_group();
   // Create Java level thread object and attach it to this thread
   bool attach_failed = false;
   {
     EXCEPTION_MARK;
     HandleMark hm(THREAD);
     Handle thread_group(THREAD, group);
     thread->allocate_threadObj(thread_group, thread_name, daemon, THREAD);
     if (HAS_PENDING_EXCEPTION) {
       CLEAR_PENDING_EXCEPTION;
       // cleanup outside the handle mark.
       attach_failed = true;
     }
   }
   if (attach_failed) {
     // Added missing cleanup
     thread->cleanup_failed_attach_current_thread();
     return JNI_ERR;
   }
   // mark the thread as no longer attaching
   // this uses a fence to push the change through so we don't have
   // to regrab the threads_lock
   thread->set_attached();
   // Set java thread status.
   java_lang_Thread::set_thread_status(thread->threadObj(),
               java_lang_Thread::RUNNABLE);
   // Notify the debugger
   if (JvmtiExport::should_post_thread_life()) {
     JvmtiExport::post_thread_start(thread);
   }
   *(JNIEnv**)penv = thread->jni_environment();
   // Now leaving the VM, so change thread_state. This is normally automatically taken care
   // of in the JVM_ENTRY. But in this situation we have to do it manually. Notice, that by
   // using ThreadStateTransition::transition, we do a callback to the safepoint code if
   // needed.
   ThreadStateTransition::transition_and_fence(thread, _thread_in_vm, _thread_in_native);
   // Perform any platform dependent FPU setup
   os::setup_fpu();
   return JNI_OK;
 }
 jint JNICALL jni_AttachCurrentThread(JavaVM *vm, void **penv, void *_args) {
   DTRACE_PROBE3(hotspot_jni, AttachCurrentThread__entry, vm, penv, _args);
   if (!vm_created) {
     DTRACE_PROBE1(hotspot_jni, AttachCurrentThread__return, JNI_ERR);
     return JNI_ERR;
   }
   JNIWrapper("AttachCurrentThread");
   jint ret = attach_current_thread(vm, penv, _args, false);
   DTRACE_PROBE1(hotspot_jni, AttachCurrentThread__return, ret);
   return ret;
 }
 jint JNICALL jni_DetachCurrentThread(JavaVM *vm)  {
   DTRACE_PROBE1(hotspot_jni, DetachCurrentThread__entry, vm);
   VM_Exit::block_if_vm_exited();
   JNIWrapper("DetachCurrentThread");
   // If the thread has been deattacted the operations is a no-op
   if (ThreadLocalStorage::thread() == NULL) {
     DTRACE_PROBE1(hotspot_jni, DetachCurrentThread__return, JNI_OK);
     return JNI_OK;
   }
   JavaThread* thread = JavaThread::current();
   if (thread->has_last_Java_frame()) {
     DTRACE_PROBE1(hotspot_jni, DetachCurrentThread__return, JNI_ERR);
     // Can't detach a thread that's running java, that can't work.
     return JNI_ERR;
   }
   // Safepoint support. Have to do call-back to safepoint code, if in the
   // middel of a safepoint operation
   ThreadStateTransition::transition_from_native(thread, _thread_in_vm);
   // XXX: Note that JavaThread::exit() call below removes the guards on the
   // stack pages set up via enable_stack_{red,yellow}_zone() calls
   // above in jni_AttachCurrentThread. Unfortunately, while the setting
   // of the guards is visible in jni_AttachCurrentThread above,
   // the removal of the guards is buried below in JavaThread::exit()
   // here. The abstraction should be more symmetrically either exposed
   // or hidden (e.g. it could probably be hidden in the same
   // (platform-dependent) methods where we do alternate stack
   // maintenance work?)
   thread->exit(false, JavaThread::jni_detach);
   delete thread;
   DTRACE_PROBE1(hotspot_jni, DetachCurrentThread__return, JNI_OK);
   return JNI_OK;
 }
 DT_RETURN_MARK_DECL(GetEnv, jint);
 jint JNICALL jni_GetEnv(JavaVM *vm, void **penv, jint version) {
   DTRACE_PROBE3(hotspot_jni, GetEnv__entry, vm, penv, version);
   jint ret = JNI_ERR;
   DT_RETURN_MARK(GetEnv, jint, (const jint&)ret);
   if (!vm_created) {
     *penv = NULL;
     ret = JNI_EDETACHED;
     return ret;
   }
   if (JvmtiExport::is_jvmti_version(version)) {
     ret = JvmtiExport::get_jvmti_interface(vm, penv, version);
     return ret;
   }
 #ifndef JVMPI_VERSION_1
 // need these in order to be polite about older agents
 #define JVMPI_VERSION_1   ((jint)0x10000001)
 #define JVMPI_VERSION_1_1 ((jint)0x10000002)
 #define JVMPI_VERSION_1_2 ((jint)0x10000003)
 #endif // !JVMPI_VERSION_1
   Thread* thread = ThreadLocalStorage::thread();
   if (thread != NULL && thread->is_Java_thread()) {
     if (Threads::is_supported_jni_version_including_1_1(version)) {
       *(JNIEnv**)penv = ((JavaThread*) thread)->jni_environment();
       ret = JNI_OK;
       return ret;
     } else if (version == JVMPI_VERSION_1 ||
                version == JVMPI_VERSION_1_1 ||
                version == JVMPI_VERSION_1_2) {
       tty->print_cr("ERROR: JVMPI, an experimental interface, is no longer supported.");
       tty->print_cr("Please use the supported interface: the JVM Tool Interface (JVM TI).");
       ret = JNI_EVERSION;
       return ret;
     } else if (JvmtiExport::is_jvmdi_version(version)) {
       tty->print_cr("FATAL ERROR: JVMDI is no longer supported.");
       tty->print_cr("Please use the supported interface: the JVM Tool Interface (JVM TI).");
       ret = JNI_EVERSION;
       return ret;
     } else {
       *penv = NULL;
       ret = JNI_EVERSION;
       return ret;
     }
   } else {
     *penv = NULL;
     ret = JNI_EDETACHED;
     return ret;
   }
 }
 jint JNICALL jni_AttachCurrentThreadAsDaemon(JavaVM *vm, void **penv, void *_args) {
   DTRACE_PROBE3(hotspot_jni, AttachCurrentThreadAsDaemon__entry, vm, penv, _args);
   if (!vm_created) {
     DTRACE_PROBE1(hotspot_jni, AttachCurrentThreadAsDaemon__return, JNI_ERR);
     return JNI_ERR;
   }
   JNIWrapper("AttachCurrentThreadAsDaemon");
   jint ret = attach_current_thread(vm, penv, _args, true);
   DTRACE_PROBE1(hotspot_jni, AttachCurrentThreadAsDaemon__return, ret);
   return ret;
 }
 } // End extern "C"
 const struct JNIInvokeInterface_ jni_InvokeInterface = {
     NULL,
     NULL,
     NULL,
     jni_DestroyJavaVM,
     jni_AttachCurrentThread,
     jni_DetachCurrentThread,
     jni_GetEnv,
     jni_AttachCurrentThreadAsDaemon
 };

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/prims/jni.cpp@828eafbd85cc (annotated)

src/share/vm/prims/jni.cpp