--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/prims/jvmtiExport.hpp Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,553 @@
+/*
+ * Copyright 1998-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+#ifndef _JAVA_JVMTIEXPORT_H_
+#define _JAVA_JVMTIEXPORT_H_
+
+// Forward declarations
+
+class JvmtiEventControllerPrivate;
+class JvmtiManageCapabilities;
+class JvmtiEnv;
+class JvmtiThreadState;
+class AttachOperation;
+
+#ifndef JVMTI_KERNEL
+#define JVMTI_SUPPORT_FLAG(key) \
+ private: \
+ static bool _##key; \
+ public: \
+ inline static void set_##key(bool on) { _##key = (on != 0); } \
+ inline static bool key() { return _##key; }
+#else // JVMTI_KERNEL
+#define JVMTI_SUPPORT_FLAG(key) \
+ private: \
+ const static bool _##key = false; \
+ public: \
+ inline static void set_##key(bool on) { report_unsupported(on); } \
+ inline static bool key() { return _##key; }
+#endif // JVMTI_KERNEL
+
+
+// This class contains the JVMTI interface for the rest of hotspot.
+//
+class JvmtiExport : public AllStatic {
+ private:
+ static int _field_access_count;
+ static int _field_modification_count;
+
+ static bool _can_access_local_variables;
+ static bool _can_examine_or_deopt_anywhere;
+ static bool _can_hotswap_or_post_breakpoint;
+ static bool _can_modify_any_class;
+ static bool _can_walk_any_space;
+
+ JVMTI_SUPPORT_FLAG(can_get_source_debug_extension)
+ JVMTI_SUPPORT_FLAG(can_maintain_original_method_order)
+ JVMTI_SUPPORT_FLAG(can_post_interpreter_events)
+ JVMTI_SUPPORT_FLAG(can_post_exceptions)
+ JVMTI_SUPPORT_FLAG(can_post_breakpoint)
+ JVMTI_SUPPORT_FLAG(can_post_field_access)
+ JVMTI_SUPPORT_FLAG(can_post_field_modification)
+ JVMTI_SUPPORT_FLAG(can_post_method_entry)
+ JVMTI_SUPPORT_FLAG(can_post_method_exit)
+ JVMTI_SUPPORT_FLAG(can_pop_frame)
+ JVMTI_SUPPORT_FLAG(can_force_early_return)
+
+ friend class JvmtiEventControllerPrivate; // should only modify these flags
+ JVMTI_SUPPORT_FLAG(should_post_single_step)
+ JVMTI_SUPPORT_FLAG(should_post_field_access)
+ JVMTI_SUPPORT_FLAG(should_post_field_modification)
+ JVMTI_SUPPORT_FLAG(should_post_class_load)
+ JVMTI_SUPPORT_FLAG(should_post_class_prepare)
+ JVMTI_SUPPORT_FLAG(should_post_class_unload)
+ JVMTI_SUPPORT_FLAG(should_post_native_method_bind)
+ JVMTI_SUPPORT_FLAG(should_post_compiled_method_load)
+ JVMTI_SUPPORT_FLAG(should_post_compiled_method_unload)
+ JVMTI_SUPPORT_FLAG(should_post_dynamic_code_generated)
+ JVMTI_SUPPORT_FLAG(should_post_monitor_contended_enter)
+ JVMTI_SUPPORT_FLAG(should_post_monitor_contended_entered)
+ JVMTI_SUPPORT_FLAG(should_post_monitor_wait)
+ JVMTI_SUPPORT_FLAG(should_post_monitor_waited)
+ JVMTI_SUPPORT_FLAG(should_post_data_dump)
+ JVMTI_SUPPORT_FLAG(should_post_garbage_collection_start)
+ JVMTI_SUPPORT_FLAG(should_post_garbage_collection_finish)
+
+ // ------ the below maybe don't have to be (but are for now)
+ // fixed conditions here ------------
+ // any events can be enabled
+ JVMTI_SUPPORT_FLAG(should_post_thread_life)
+ JVMTI_SUPPORT_FLAG(should_post_object_free)
+ JVMTI_SUPPORT_FLAG(should_post_resource_exhausted)
+
+ // we are holding objects on the heap - need to talk to GC - e.g.
+ // breakpoint info
+ JVMTI_SUPPORT_FLAG(should_clean_up_heap_objects)
+ JVMTI_SUPPORT_FLAG(should_post_vm_object_alloc)
+
+ // If flag cannot be implemented, give an error if on=true
+ static void report_unsupported(bool on);
+
+ // these should only be called by the friend class
+ friend class JvmtiManageCapabilities;
+ inline static void set_can_examine_or_deopt_anywhere(bool on) { _can_examine_or_deopt_anywhere = (on != 0); }
+ inline static void set_can_modify_any_class(bool on) { _can_modify_any_class = (on != 0); }
+ inline static void set_can_access_local_variables(bool on) { _can_access_local_variables = (on != 0); }
+ inline static void set_can_hotswap_or_post_breakpoint(bool on) { _can_hotswap_or_post_breakpoint = (on != 0); }
+ inline static void set_can_walk_any_space(bool on) { _can_walk_any_space = (on != 0); }
+
+ enum {
+ JVMTI_VERSION_MASK = 0x70000000,
+ JVMTI_VERSION_VALUE = 0x30000000,
+ JVMDI_VERSION_VALUE = 0x20000000
+ };
+
+ static void post_field_modification(JavaThread *thread, methodOop method, address location,
+ KlassHandle field_klass, Handle object, jfieldID field,
+ char sig_type, jvalue *value);
+
+
+ private:
+ // CompiledMethodUnload events are reported from the VM thread so they
+ // are collected in lists (of jmethodID/addresses) and the events are posted later
+ // from threads posting CompieldMethodLoad or DynamicCodeGenerated events.
+ static bool _have_pending_compiled_method_unload_events;
+ static GrowableArray<jmethodID>* _pending_compiled_method_unload_method_ids;
+ static GrowableArray<const void *>* _pending_compiled_method_unload_code_begins;
+ static JavaThread* _current_poster;
+
+ // tests if there are CompiledMethodUnload events pending
+ inline static bool have_pending_compiled_method_unload_events() {
+ return _have_pending_compiled_method_unload_events;
+ }
+
+ // posts any pending CompiledMethodUnload events.
+ static void post_pending_compiled_method_unload_events();
+
+ // posts a DynamicCodeGenerated event (internal/private implementation).
+ // The public post_dynamic_code_generated* functions make use of the
+ // internal implementation.
+ static void post_dynamic_code_generated_internal(const char *name, const void *code_begin, const void *code_end) KERNEL_RETURN;
+
+
+ // GenerateEvents support to allow posting of CompiledMethodLoad and
+ // DynamicCodeGenerated events for a given environment.
+ friend class JvmtiCodeBlobEvents;
+
+ static void post_compiled_method_load(JvmtiEnv* env, const jmethodID method, const jint length,
+ const void *code_begin, const jint map_length,
+ const jvmtiAddrLocationMap* map) KERNEL_RETURN;
+ static void post_dynamic_code_generated(JvmtiEnv* env, const char *name, const void *code_begin,
+ const void *code_end) KERNEL_RETURN;
+
+ // The RedefineClasses() API breaks some invariants in the "regular"
+ // system. For example, there are sanity checks when GC'ing nmethods
+ // that require the containing class to be unloading. However, when a
+ // method is redefined, the old method and nmethod can become GC'able
+ // without the containing class unloading. The state of becoming
+ // GC'able can be asynchronous to the RedefineClasses() call since
+ // the old method may still be running and cannot be GC'ed until
+ // after all old invocations have finished. Additionally, a method
+ // that has not been redefined may have an nmethod that depends on
+ // the redefined method. The dependent nmethod will get deopted in
+ // this case and may also be GC'able without the containing class
+ // being unloaded.
+ //
+ // This flag indicates whether RedefineClasses() has ever redefined
+ // one or more classes during the lifetime of the VM. The flag should
+ // only be set by the friend class and can be queried by other sub
+ // systems as needed to relax invariant checks.
+ static bool _has_redefined_a_class;
+ friend class VM_RedefineClasses;
+ inline static void set_has_redefined_a_class() {
+ _has_redefined_a_class = true;
+ }
+
+ // Flag to indicate if the compiler has recorded all dependencies. When the
+ // can_redefine_classes capability is enabled in the OnLoad phase then the compiler
+ // records all dependencies from startup. However if the capability is first
+ // enabled some time later then the dependencies recorded by the compiler
+ // are incomplete. This flag is used by RedefineClasses to know if the
+ // dependency information is complete or not.
+ static bool _all_dependencies_are_recorded;
+
+ public:
+ inline static bool has_redefined_a_class() {
+ return _has_redefined_a_class;
+ }
+
+ inline static bool all_dependencies_are_recorded() {
+ return _all_dependencies_are_recorded;
+ }
+
+ inline static void set_all_dependencies_are_recorded(bool on) {
+ _all_dependencies_are_recorded = (on != 0);
+ }
+
+
+ // let JVMTI know that the JVM_OnLoad code is running
+ static void enter_onload_phase();
+
+ // let JVMTI know that the VM isn't up yet (and JVM_OnLoad code isn't running)
+ static void enter_primordial_phase();
+
+ // let JVMTI know that the VM isn't up yet but JNI is live
+ static void enter_start_phase();
+
+ // let JVMTI know that the VM is fully up and running now
+ static void enter_live_phase();
+
+ // ------ can_* conditions (below) are set at OnLoad and never changed ------------
+ inline static bool can_examine_or_deopt_anywhere() { return _can_examine_or_deopt_anywhere; }
+ inline static bool can_modify_any_class() { return _can_modify_any_class; }
+ inline static bool can_access_local_variables() { return _can_access_local_variables; }
+ inline static bool can_hotswap_or_post_breakpoint() { return _can_hotswap_or_post_breakpoint; }
+ inline static bool can_walk_any_space() { return _can_walk_any_space; }
+
+ // field access management
+ static address get_field_access_count_addr();
+
+ // field modification management
+ static address get_field_modification_count_addr();
+
+ // -----------------
+
+ static bool is_jvmti_version(jint version) { return (version & JVMTI_VERSION_MASK) == JVMTI_VERSION_VALUE; }
+ static bool is_jvmdi_version(jint version) { return (version & JVMTI_VERSION_MASK) == JVMDI_VERSION_VALUE; }
+ static jint get_jvmti_interface(JavaVM *jvm, void **penv, jint version);
+
+ // single stepping management methods
+ static void at_single_stepping_point(JavaThread *thread, methodOop method, address location) KERNEL_RETURN;
+ static void expose_single_stepping(JavaThread *thread) KERNEL_RETURN;
+ static bool hide_single_stepping(JavaThread *thread) KERNEL_RETURN_(return false;);
+
+ // Methods that notify the debugger that something interesting has happened in the VM.
+ static void post_vm_start ();
+ static void post_vm_initialized ();
+ static void post_vm_death ();
+
+ static void post_single_step (JavaThread *thread, methodOop method, address location) KERNEL_RETURN;
+ static void post_raw_breakpoint (JavaThread *thread, methodOop method, address location) KERNEL_RETURN;
+
+ static void post_exception_throw (JavaThread *thread, methodOop method, address location, oop exception) KERNEL_RETURN;
+ static void notice_unwind_due_to_exception (JavaThread *thread, methodOop method, address location, oop exception, bool in_handler_frame) KERNEL_RETURN;
+
+ static oop jni_GetField_probe (JavaThread *thread, jobject jobj,
+ oop obj, klassOop klass, jfieldID fieldID, bool is_static)
+ KERNEL_RETURN_(return NULL;);
+ static oop jni_GetField_probe_nh (JavaThread *thread, jobject jobj,
+ oop obj, klassOop klass, jfieldID fieldID, bool is_static)
+ KERNEL_RETURN_(return NULL;);
+ static void post_field_access_by_jni (JavaThread *thread, oop obj,
+ klassOop klass, jfieldID fieldID, bool is_static) KERNEL_RETURN;
+ static void post_field_access (JavaThread *thread, methodOop method,
+ address location, KlassHandle field_klass, Handle object, jfieldID field) KERNEL_RETURN;
+ static oop jni_SetField_probe (JavaThread *thread, jobject jobj,
+ oop obj, klassOop klass, jfieldID fieldID, bool is_static, char sig_type,
+ jvalue *value) KERNEL_RETURN_(return NULL;);
+ static oop jni_SetField_probe_nh (JavaThread *thread, jobject jobj,
+ oop obj, klassOop klass, jfieldID fieldID, bool is_static, char sig_type,
+ jvalue *value) KERNEL_RETURN_(return NULL;);
+ static void post_field_modification_by_jni(JavaThread *thread, oop obj,
+ klassOop klass, jfieldID fieldID, bool is_static, char sig_type,
+ jvalue *value);
+ static void post_raw_field_modification(JavaThread *thread, methodOop method,
+ address location, KlassHandle field_klass, Handle object, jfieldID field,
+ char sig_type, jvalue *value) KERNEL_RETURN;
+
+ static void post_method_entry (JavaThread *thread, methodOop method, frame current_frame) KERNEL_RETURN;
+ static void post_method_exit (JavaThread *thread, methodOop method, frame current_frame) KERNEL_RETURN;
+
+ static void post_class_load (JavaThread *thread, klassOop klass) KERNEL_RETURN;
+ static void post_class_unload (klassOop klass) KERNEL_RETURN;
+ static void post_class_prepare (JavaThread *thread, klassOop klass) KERNEL_RETURN;
+
+ static void post_thread_start (JavaThread *thread) KERNEL_RETURN;
+ static void post_thread_end (JavaThread *thread) KERNEL_RETURN;
+
+ // Support for java.lang.instrument agent loading.
+ static bool _should_post_class_file_load_hook;
+ inline static void set_should_post_class_file_load_hook(bool on) { _should_post_class_file_load_hook = on; }
+ inline static bool should_post_class_file_load_hook() { return _should_post_class_file_load_hook; }
+ static void post_class_file_load_hook(symbolHandle h_name, Handle class_loader,
+ Handle h_protection_domain,
+ unsigned char **data_ptr, unsigned char **end_ptr,
+ unsigned char **cached_data_ptr,
+ jint *cached_length_ptr);
+ static void post_native_method_bind(methodOop method, address* function_ptr) KERNEL_RETURN;
+ static void post_compiled_method_load(nmethod *nm) KERNEL_RETURN;
+ static void post_dynamic_code_generated(const char *name, const void *code_begin, const void *code_end) KERNEL_RETURN;
+
+ // used at a safepoint to post a CompiledMethodUnload event
+ static void post_compiled_method_unload_at_safepoint(jmethodID mid, const void *code_begin) KERNEL_RETURN;
+
+ // similiar to post_dynamic_code_generated except that it can be used to
+ // post a DynamicCodeGenerated event while holding locks in the VM. Any event
+ // posted using this function is recorded by the enclosing event collector
+ // -- JvmtiDynamicCodeEventCollector.
+ static void post_dynamic_code_generated_while_holding_locks(const char* name, address code_begin, address code_end) KERNEL_RETURN;
+
+ static void post_garbage_collection_finish() KERNEL_RETURN;
+ static void post_garbage_collection_start() KERNEL_RETURN;
+ static void post_data_dump() KERNEL_RETURN;
+ static void post_monitor_contended_enter(JavaThread *thread, ObjectMonitor *obj_mntr) KERNEL_RETURN;
+ static void post_monitor_contended_entered(JavaThread *thread, ObjectMonitor *obj_mntr) KERNEL_RETURN;
+ static void post_monitor_wait(JavaThread *thread, oop obj, jlong timeout) KERNEL_RETURN;
+ static void post_monitor_waited(JavaThread *thread, ObjectMonitor *obj_mntr, jboolean timed_out) KERNEL_RETURN;
+ static void post_object_free(JvmtiEnv* env, jlong tag) KERNEL_RETURN;
+ static void post_resource_exhausted(jint resource_exhausted_flags, const char* detail) KERNEL_RETURN;
+ static void record_vm_internal_object_allocation(oop object) KERNEL_RETURN;
+ // Post objects collected by vm_object_alloc_event_collector.
+ static void post_vm_object_alloc(JavaThread *thread, oop object) KERNEL_RETURN;
+ // Collects vm internal objects for later event posting.
+ inline static void vm_object_alloc_event_collector(oop object) {
+ if (should_post_vm_object_alloc()) {
+ record_vm_internal_object_allocation(object);
+ }
+ }
+
+ static void cleanup_thread (JavaThread* thread) KERNEL_RETURN;
+
+ static void oops_do(OopClosure* f) KERNEL_RETURN;
+
+ static void transition_pending_onload_raw_monitors() KERNEL_RETURN;
+
+#ifndef SERVICES_KERNEL
+ // attach support
+ static jint load_agent_library(AttachOperation* op, outputStream* out);
+#endif // SERVICES_KERNEL
+
+ // SetNativeMethodPrefix support
+ static char** get_all_native_method_prefixes(int* count_ptr);
+
+ // call after CMS has completed referencing processing
+ static void cms_ref_processing_epilogue() KERNEL_RETURN;
+};
+
+// Support class used by JvmtiDynamicCodeEventCollector and others. It
+// describes a single code blob by name and address range.
+class JvmtiCodeBlobDesc : public CHeapObj {
+ private:
+ char _name[64];
+ address _code_begin;
+ address _code_end;
+
+ public:
+ JvmtiCodeBlobDesc(const char *name, address code_begin, address code_end) {
+ assert(name != NULL, "all code blobs must be named");
+ strncpy(_name, name, sizeof(_name));
+ _name[sizeof(_name)-1] = '\0';
+ _code_begin = code_begin;
+ _code_end = code_end;
+ }
+ char* name() { return _name; }
+ address code_begin() { return _code_begin; }
+ address code_end() { return _code_end; }
+};
+
+// JvmtiEventCollector is a helper class to setup thread for
+// event collection.
+class JvmtiEventCollector : public StackObj {
+ private:
+ JvmtiEventCollector* _prev; // Save previous one to support nested event collector.
+
+ public:
+ void setup_jvmti_thread_state(); // Set this collector in current thread.
+ void unset_jvmti_thread_state(); // Reset previous collector in current thread.
+ virtual bool is_dynamic_code_event() { return false; }
+ virtual bool is_vm_object_alloc_event(){ return false; }
+ JvmtiEventCollector *get_prev() { return _prev; }
+};
+
+// A JvmtiDynamicCodeEventCollector is a helper class for the JvmtiExport
+// interface. It collects "dynamic code generated" events that are posted
+// while holding locks. When the event collector goes out of scope the
+// events will be posted.
+//
+// Usage :-
+//
+// {
+// JvmtiDynamicCodeEventCollector event_collector;
+// :
+// { MutexLocker ml(...)
+// :
+// JvmtiExport::post_dynamic_code_generated_while_holding_locks(...)
+// }
+// // event collector goes out of scope => post events to profiler.
+// }
+
+class JvmtiDynamicCodeEventCollector : public JvmtiEventCollector {
+ private:
+ GrowableArray<JvmtiCodeBlobDesc*>* _code_blobs; // collected code blob events
+
+ friend class JvmtiExport;
+ void register_stub(const char* name, address start, address end);
+
+ public:
+ JvmtiDynamicCodeEventCollector() KERNEL_RETURN;
+ ~JvmtiDynamicCodeEventCollector() KERNEL_RETURN;
+ bool is_dynamic_code_event() { return true; }
+
+};
+
+// Used to record vm internally allocated object oops and post
+// vm object alloc event for objects visible to java world.
+// Constructor enables JvmtiThreadState flag and all vm allocated
+// objects are recorded in a growable array. When destructor is
+// called the vm object alloc event is posted for each objects
+// visible to java world.
+// See jvm.cpp file for its usage.
+//
+class JvmtiVMObjectAllocEventCollector : public JvmtiEventCollector {
+ private:
+ GrowableArray<oop>* _allocated; // field to record vm internally allocated object oop.
+ bool _enable; // This flag is enabled in constructor and disabled
+ // in destructor before posting event. To avoid
+ // collection of objects allocated while running java code inside
+ // agent post_vm_object_alloc() event handler.
+
+ //GC support
+ void oops_do(OopClosure* f);
+
+ friend class JvmtiExport;
+ // Record vm allocated object oop.
+ inline void record_allocation(oop obj);
+
+ //GC support
+ static void oops_do_for_all_threads(OopClosure* f);
+
+ public:
+ JvmtiVMObjectAllocEventCollector() KERNEL_RETURN;
+ ~JvmtiVMObjectAllocEventCollector() KERNEL_RETURN;
+ bool is_vm_object_alloc_event() { return true; }
+
+ bool is_enabled() { return _enable; }
+ void set_enabled(bool on) { _enable = on; }
+};
+
+
+
+// Marker class to disable the posting of VMObjectAlloc events
+// within its scope.
+//
+// Usage :-
+//
+// {
+// NoJvmtiVMObjectAllocMark njm;
+// :
+// // VMObjAlloc event will not be posted
+// JvmtiExport::vm_object_alloc_event_collector(obj);
+// :
+// }
+
+class NoJvmtiVMObjectAllocMark : public StackObj {
+ private:
+ // enclosing collector if enabled, NULL otherwise
+ JvmtiVMObjectAllocEventCollector *_collector;
+
+ bool was_enabled() { return _collector != NULL; }
+
+ public:
+ NoJvmtiVMObjectAllocMark() KERNEL_RETURN;
+ ~NoJvmtiVMObjectAllocMark() KERNEL_RETURN;
+};
+
+
+// Base class for reporting GC events to JVMTI.
+class JvmtiGCMarker : public StackObj {
+ private:
+ bool _full; // marks a "full" GC
+ unsigned int _invocation_count; // GC invocation count
+ protected:
+ JvmtiGCMarker(bool full) KERNEL_RETURN; // protected
+ ~JvmtiGCMarker() KERNEL_RETURN; // protected
+};
+
+
+// Support class used to report GC events to JVMTI. The class is stack
+// allocated and should be placed in the doit() implementation of all
+// vm operations that do a stop-the-world GC for failed allocation.
+//
+// Usage :-
+//
+// void VM_GenCollectForAllocation::doit() {
+// JvmtiGCForAllocationMarker jgcm;
+// :
+// }
+//
+// If jvmti is not enabled the constructor and destructor is essentially
+// a no-op (no overhead).
+//
+class JvmtiGCForAllocationMarker : public JvmtiGCMarker {
+ public:
+ JvmtiGCForAllocationMarker() : JvmtiGCMarker(false) {
+ }
+};
+
+// Support class used to report GC events to JVMTI. The class is stack
+// allocated and should be placed in the doit() implementation of all
+// vm operations that do a "full" stop-the-world GC. This class differs
+// from JvmtiGCForAllocationMarker in that this class assumes that a
+// "full" GC will happen.
+//
+// Usage :-
+//
+// void VM_GenCollectFull::doit() {
+// JvmtiGCFullMarker jgcm;
+// :
+// }
+//
+class JvmtiGCFullMarker : public JvmtiGCMarker {
+ public:
+ JvmtiGCFullMarker() : JvmtiGCMarker(true) {
+ }
+};
+
+
+// JvmtiHideSingleStepping is a helper class for hiding
+// internal single step events.
+class JvmtiHideSingleStepping : public StackObj {
+ private:
+ bool _single_step_hidden;
+ JavaThread * _thread;
+
+ public:
+ JvmtiHideSingleStepping(JavaThread * thread) {
+ assert(thread != NULL, "sanity check");
+
+ _single_step_hidden = false;
+ _thread = thread;
+ if (JvmtiExport::should_post_single_step()) {
+ _single_step_hidden = JvmtiExport::hide_single_stepping(_thread);
+ }
+ }
+
+ ~JvmtiHideSingleStepping() {
+ if (_single_step_hidden) {
+ JvmtiExport::expose_single_stepping(_thread);
+ }
+ }
+};
+
+#endif /* _JAVA_JVMTIEXPORT_H_ */