| /* |
| * 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_ */ |
