duke@435: /* trims@1907: * Copyright (c) 1998, 2010, Oracle and/or its affiliates. All rights reserved. duke@435: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. duke@435: * duke@435: * This code is free software; you can redistribute it and/or modify it duke@435: * under the terms of the GNU General Public License version 2 only, as duke@435: * published by the Free Software Foundation. duke@435: * duke@435: * This code is distributed in the hope that it will be useful, but WITHOUT duke@435: * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or duke@435: * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License duke@435: * version 2 for more details (a copy is included in the LICENSE file that duke@435: * accompanied this code). duke@435: * duke@435: * You should have received a copy of the GNU General Public License version duke@435: * 2 along with this work; if not, write to the Free Software Foundation, duke@435: * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. duke@435: * trims@1907: * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA trims@1907: * or visit www.oracle.com if you need additional information or have any trims@1907: * questions. duke@435: * duke@435: */ duke@435: stefank@2314: #ifndef SHARE_VM_PRIMS_JVMTIEXPORT_HPP stefank@2314: #define SHARE_VM_PRIMS_JVMTIEXPORT_HPP stefank@2314: stefank@2314: #include "jvmtifiles/jvmti.h" stefank@2314: #include "memory/allocation.hpp" stefank@2314: #include "memory/iterator.hpp" stefank@2314: #include "oops/oop.hpp" stefank@2314: #include "oops/oopsHierarchy.hpp" stefank@2314: #include "runtime/frame.hpp" stefank@2314: #include "runtime/handles.hpp" stefank@2314: #include "utilities/globalDefinitions.hpp" stefank@2314: #include "utilities/growableArray.hpp" duke@435: stefank@2325: // Must be included after jvmti.h. stefank@2325: #include "code/jvmticmlr.h" stefank@2325: duke@435: // Forward declarations duke@435: duke@435: class JvmtiEventControllerPrivate; duke@435: class JvmtiManageCapabilities; duke@435: class JvmtiEnv; duke@435: class JvmtiThreadState; duke@435: class AttachOperation; duke@435: duke@435: #ifndef JVMTI_KERNEL duke@435: #define JVMTI_SUPPORT_FLAG(key) \ duke@435: private: \ duke@435: static bool _##key; \ duke@435: public: \ duke@435: inline static void set_##key(bool on) { _##key = (on != 0); } \ duke@435: inline static bool key() { return _##key; } duke@435: #else // JVMTI_KERNEL duke@435: #define JVMTI_SUPPORT_FLAG(key) \ duke@435: private: \ duke@435: const static bool _##key = false; \ duke@435: public: \ duke@435: inline static void set_##key(bool on) { report_unsupported(on); } \ duke@435: inline static bool key() { return _##key; } duke@435: #endif // JVMTI_KERNEL duke@435: duke@435: duke@435: // This class contains the JVMTI interface for the rest of hotspot. duke@435: // duke@435: class JvmtiExport : public AllStatic { duke@435: private: duke@435: static int _field_access_count; duke@435: static int _field_modification_count; duke@435: duke@435: static bool _can_access_local_variables; duke@435: static bool _can_hotswap_or_post_breakpoint; duke@435: static bool _can_modify_any_class; duke@435: static bool _can_walk_any_space; duke@435: duke@435: JVMTI_SUPPORT_FLAG(can_get_source_debug_extension) duke@435: JVMTI_SUPPORT_FLAG(can_maintain_original_method_order) duke@435: JVMTI_SUPPORT_FLAG(can_post_interpreter_events) dcubed@1648: JVMTI_SUPPORT_FLAG(can_post_on_exceptions) duke@435: JVMTI_SUPPORT_FLAG(can_post_breakpoint) duke@435: JVMTI_SUPPORT_FLAG(can_post_field_access) duke@435: JVMTI_SUPPORT_FLAG(can_post_field_modification) duke@435: JVMTI_SUPPORT_FLAG(can_post_method_entry) duke@435: JVMTI_SUPPORT_FLAG(can_post_method_exit) duke@435: JVMTI_SUPPORT_FLAG(can_pop_frame) duke@435: JVMTI_SUPPORT_FLAG(can_force_early_return) duke@435: duke@435: friend class JvmtiEventControllerPrivate; // should only modify these flags duke@435: JVMTI_SUPPORT_FLAG(should_post_single_step) duke@435: JVMTI_SUPPORT_FLAG(should_post_field_access) duke@435: JVMTI_SUPPORT_FLAG(should_post_field_modification) duke@435: JVMTI_SUPPORT_FLAG(should_post_class_load) duke@435: JVMTI_SUPPORT_FLAG(should_post_class_prepare) duke@435: JVMTI_SUPPORT_FLAG(should_post_class_unload) duke@435: JVMTI_SUPPORT_FLAG(should_post_native_method_bind) duke@435: JVMTI_SUPPORT_FLAG(should_post_compiled_method_load) duke@435: JVMTI_SUPPORT_FLAG(should_post_compiled_method_unload) duke@435: JVMTI_SUPPORT_FLAG(should_post_dynamic_code_generated) duke@435: JVMTI_SUPPORT_FLAG(should_post_monitor_contended_enter) duke@435: JVMTI_SUPPORT_FLAG(should_post_monitor_contended_entered) duke@435: JVMTI_SUPPORT_FLAG(should_post_monitor_wait) duke@435: JVMTI_SUPPORT_FLAG(should_post_monitor_waited) duke@435: JVMTI_SUPPORT_FLAG(should_post_data_dump) duke@435: JVMTI_SUPPORT_FLAG(should_post_garbage_collection_start) duke@435: JVMTI_SUPPORT_FLAG(should_post_garbage_collection_finish) dcubed@1648: JVMTI_SUPPORT_FLAG(should_post_on_exceptions) duke@435: duke@435: // ------ the below maybe don't have to be (but are for now) duke@435: // fixed conditions here ------------ duke@435: // any events can be enabled duke@435: JVMTI_SUPPORT_FLAG(should_post_thread_life) duke@435: JVMTI_SUPPORT_FLAG(should_post_object_free) duke@435: JVMTI_SUPPORT_FLAG(should_post_resource_exhausted) duke@435: duke@435: // we are holding objects on the heap - need to talk to GC - e.g. duke@435: // breakpoint info duke@435: JVMTI_SUPPORT_FLAG(should_clean_up_heap_objects) duke@435: JVMTI_SUPPORT_FLAG(should_post_vm_object_alloc) duke@435: duke@435: // If flag cannot be implemented, give an error if on=true duke@435: static void report_unsupported(bool on); duke@435: duke@435: // these should only be called by the friend class duke@435: friend class JvmtiManageCapabilities; duke@435: inline static void set_can_modify_any_class(bool on) { _can_modify_any_class = (on != 0); } duke@435: inline static void set_can_access_local_variables(bool on) { _can_access_local_variables = (on != 0); } duke@435: inline static void set_can_hotswap_or_post_breakpoint(bool on) { _can_hotswap_or_post_breakpoint = (on != 0); } duke@435: inline static void set_can_walk_any_space(bool on) { _can_walk_any_space = (on != 0); } duke@435: duke@435: enum { duke@435: JVMTI_VERSION_MASK = 0x70000000, duke@435: JVMTI_VERSION_VALUE = 0x30000000, duke@435: JVMDI_VERSION_VALUE = 0x20000000 duke@435: }; duke@435: duke@435: static void post_field_modification(JavaThread *thread, methodOop method, address location, duke@435: KlassHandle field_klass, Handle object, jfieldID field, duke@435: char sig_type, jvalue *value); duke@435: duke@435: duke@435: private: duke@435: // CompiledMethodUnload events are reported from the VM thread so they duke@435: // are collected in lists (of jmethodID/addresses) and the events are posted later duke@435: // from threads posting CompieldMethodLoad or DynamicCodeGenerated events. duke@435: static bool _have_pending_compiled_method_unload_events; duke@435: static GrowableArray* _pending_compiled_method_unload_method_ids; duke@435: static GrowableArray* _pending_compiled_method_unload_code_begins; duke@435: static JavaThread* _current_poster; duke@435: duke@435: // tests if there are CompiledMethodUnload events pending duke@435: inline static bool have_pending_compiled_method_unload_events() { duke@435: return _have_pending_compiled_method_unload_events; duke@435: } duke@435: duke@435: // posts any pending CompiledMethodUnload events. duke@435: static void post_pending_compiled_method_unload_events(); duke@435: never@1932: // Perform the actual notification to interested JvmtiEnvs. never@1932: static void post_compiled_method_unload_internal(JavaThread* self, jmethodID mid, const void* code_begin); never@1932: duke@435: // posts a DynamicCodeGenerated event (internal/private implementation). duke@435: // The public post_dynamic_code_generated* functions make use of the duke@435: // internal implementation. duke@435: static void post_dynamic_code_generated_internal(const char *name, const void *code_begin, const void *code_end) KERNEL_RETURN; duke@435: duke@435: duke@435: // GenerateEvents support to allow posting of CompiledMethodLoad and duke@435: // DynamicCodeGenerated events for a given environment. duke@435: friend class JvmtiCodeBlobEvents; duke@435: duke@435: static void post_compiled_method_load(JvmtiEnv* env, const jmethodID method, const jint length, duke@435: const void *code_begin, const jint map_length, duke@435: const jvmtiAddrLocationMap* map) KERNEL_RETURN; duke@435: static void post_dynamic_code_generated(JvmtiEnv* env, const char *name, const void *code_begin, duke@435: const void *code_end) KERNEL_RETURN; duke@435: duke@435: // The RedefineClasses() API breaks some invariants in the "regular" duke@435: // system. For example, there are sanity checks when GC'ing nmethods duke@435: // that require the containing class to be unloading. However, when a duke@435: // method is redefined, the old method and nmethod can become GC'able duke@435: // without the containing class unloading. The state of becoming duke@435: // GC'able can be asynchronous to the RedefineClasses() call since duke@435: // the old method may still be running and cannot be GC'ed until duke@435: // after all old invocations have finished. Additionally, a method duke@435: // that has not been redefined may have an nmethod that depends on duke@435: // the redefined method. The dependent nmethod will get deopted in duke@435: // this case and may also be GC'able without the containing class duke@435: // being unloaded. duke@435: // duke@435: // This flag indicates whether RedefineClasses() has ever redefined duke@435: // one or more classes during the lifetime of the VM. The flag should duke@435: // only be set by the friend class and can be queried by other sub duke@435: // systems as needed to relax invariant checks. duke@435: static bool _has_redefined_a_class; duke@435: friend class VM_RedefineClasses; duke@435: inline static void set_has_redefined_a_class() { duke@435: _has_redefined_a_class = true; duke@435: } duke@435: duke@435: // Flag to indicate if the compiler has recorded all dependencies. When the duke@435: // can_redefine_classes capability is enabled in the OnLoad phase then the compiler duke@435: // records all dependencies from startup. However if the capability is first duke@435: // enabled some time later then the dependencies recorded by the compiler duke@435: // are incomplete. This flag is used by RedefineClasses to know if the duke@435: // dependency information is complete or not. duke@435: static bool _all_dependencies_are_recorded; duke@435: duke@435: public: duke@435: inline static bool has_redefined_a_class() { duke@435: return _has_redefined_a_class; duke@435: } duke@435: duke@435: inline static bool all_dependencies_are_recorded() { duke@435: return _all_dependencies_are_recorded; duke@435: } duke@435: duke@435: inline static void set_all_dependencies_are_recorded(bool on) { duke@435: _all_dependencies_are_recorded = (on != 0); duke@435: } duke@435: duke@435: duke@435: // let JVMTI know that the JVM_OnLoad code is running duke@435: static void enter_onload_phase(); duke@435: duke@435: // let JVMTI know that the VM isn't up yet (and JVM_OnLoad code isn't running) duke@435: static void enter_primordial_phase(); duke@435: duke@435: // let JVMTI know that the VM isn't up yet but JNI is live duke@435: static void enter_start_phase(); duke@435: duke@435: // let JVMTI know that the VM is fully up and running now duke@435: static void enter_live_phase(); duke@435: duke@435: // ------ can_* conditions (below) are set at OnLoad and never changed ------------ duke@435: inline static bool can_modify_any_class() { return _can_modify_any_class; } duke@435: inline static bool can_access_local_variables() { return _can_access_local_variables; } duke@435: inline static bool can_hotswap_or_post_breakpoint() { return _can_hotswap_or_post_breakpoint; } duke@435: inline static bool can_walk_any_space() { return _can_walk_any_space; } duke@435: duke@435: // field access management duke@435: static address get_field_access_count_addr(); duke@435: duke@435: // field modification management duke@435: static address get_field_modification_count_addr(); duke@435: duke@435: // ----------------- duke@435: duke@435: static bool is_jvmti_version(jint version) { return (version & JVMTI_VERSION_MASK) == JVMTI_VERSION_VALUE; } duke@435: static bool is_jvmdi_version(jint version) { return (version & JVMTI_VERSION_MASK) == JVMDI_VERSION_VALUE; } duke@435: static jint get_jvmti_interface(JavaVM *jvm, void **penv, jint version); dcubed@1556: static void decode_version_values(jint version, int * major, int * minor, dcubed@1556: int * micro); duke@435: duke@435: // single stepping management methods duke@435: static void at_single_stepping_point(JavaThread *thread, methodOop method, address location) KERNEL_RETURN; duke@435: static void expose_single_stepping(JavaThread *thread) KERNEL_RETURN; duke@435: static bool hide_single_stepping(JavaThread *thread) KERNEL_RETURN_(return false;); duke@435: duke@435: // Methods that notify the debugger that something interesting has happened in the VM. duke@435: static void post_vm_start (); duke@435: static void post_vm_initialized (); duke@435: static void post_vm_death (); duke@435: duke@435: static void post_single_step (JavaThread *thread, methodOop method, address location) KERNEL_RETURN; duke@435: static void post_raw_breakpoint (JavaThread *thread, methodOop method, address location) KERNEL_RETURN; duke@435: duke@435: static void post_exception_throw (JavaThread *thread, methodOop method, address location, oop exception) KERNEL_RETURN; duke@435: static void notice_unwind_due_to_exception (JavaThread *thread, methodOop method, address location, oop exception, bool in_handler_frame) KERNEL_RETURN; duke@435: duke@435: static oop jni_GetField_probe (JavaThread *thread, jobject jobj, duke@435: oop obj, klassOop klass, jfieldID fieldID, bool is_static) duke@435: KERNEL_RETURN_(return NULL;); duke@435: static oop jni_GetField_probe_nh (JavaThread *thread, jobject jobj, duke@435: oop obj, klassOop klass, jfieldID fieldID, bool is_static) duke@435: KERNEL_RETURN_(return NULL;); duke@435: static void post_field_access_by_jni (JavaThread *thread, oop obj, duke@435: klassOop klass, jfieldID fieldID, bool is_static) KERNEL_RETURN; duke@435: static void post_field_access (JavaThread *thread, methodOop method, duke@435: address location, KlassHandle field_klass, Handle object, jfieldID field) KERNEL_RETURN; duke@435: static oop jni_SetField_probe (JavaThread *thread, jobject jobj, duke@435: oop obj, klassOop klass, jfieldID fieldID, bool is_static, char sig_type, duke@435: jvalue *value) KERNEL_RETURN_(return NULL;); duke@435: static oop jni_SetField_probe_nh (JavaThread *thread, jobject jobj, duke@435: oop obj, klassOop klass, jfieldID fieldID, bool is_static, char sig_type, duke@435: jvalue *value) KERNEL_RETURN_(return NULL;); duke@435: static void post_field_modification_by_jni(JavaThread *thread, oop obj, duke@435: klassOop klass, jfieldID fieldID, bool is_static, char sig_type, duke@435: jvalue *value); duke@435: static void post_raw_field_modification(JavaThread *thread, methodOop method, duke@435: address location, KlassHandle field_klass, Handle object, jfieldID field, duke@435: char sig_type, jvalue *value) KERNEL_RETURN; duke@435: duke@435: static void post_method_entry (JavaThread *thread, methodOop method, frame current_frame) KERNEL_RETURN; duke@435: static void post_method_exit (JavaThread *thread, methodOop method, frame current_frame) KERNEL_RETURN; duke@435: duke@435: static void post_class_load (JavaThread *thread, klassOop klass) KERNEL_RETURN; duke@435: static void post_class_unload (klassOop klass) KERNEL_RETURN; duke@435: static void post_class_prepare (JavaThread *thread, klassOop klass) KERNEL_RETURN; duke@435: duke@435: static void post_thread_start (JavaThread *thread) KERNEL_RETURN; duke@435: static void post_thread_end (JavaThread *thread) KERNEL_RETURN; duke@435: duke@435: // Support for java.lang.instrument agent loading. duke@435: static bool _should_post_class_file_load_hook; duke@435: inline static void set_should_post_class_file_load_hook(bool on) { _should_post_class_file_load_hook = on; } duke@435: inline static bool should_post_class_file_load_hook() { return _should_post_class_file_load_hook; } duke@435: static void post_class_file_load_hook(symbolHandle h_name, Handle class_loader, duke@435: Handle h_protection_domain, duke@435: unsigned char **data_ptr, unsigned char **end_ptr, duke@435: unsigned char **cached_data_ptr, duke@435: jint *cached_length_ptr); duke@435: static void post_native_method_bind(methodOop method, address* function_ptr) KERNEL_RETURN; duke@435: static void post_compiled_method_load(nmethod *nm) KERNEL_RETURN; duke@435: static void post_dynamic_code_generated(const char *name, const void *code_begin, const void *code_end) KERNEL_RETURN; duke@435: never@1932: // used to post a CompiledMethodUnload event never@1932: static void post_compiled_method_unload(jmethodID mid, const void *code_begin) KERNEL_RETURN; duke@435: duke@435: // similiar to post_dynamic_code_generated except that it can be used to duke@435: // post a DynamicCodeGenerated event while holding locks in the VM. Any event duke@435: // posted using this function is recorded by the enclosing event collector duke@435: // -- JvmtiDynamicCodeEventCollector. duke@435: static void post_dynamic_code_generated_while_holding_locks(const char* name, address code_begin, address code_end) KERNEL_RETURN; duke@435: duke@435: static void post_garbage_collection_finish() KERNEL_RETURN; duke@435: static void post_garbage_collection_start() KERNEL_RETURN; duke@435: static void post_data_dump() KERNEL_RETURN; duke@435: static void post_monitor_contended_enter(JavaThread *thread, ObjectMonitor *obj_mntr) KERNEL_RETURN; duke@435: static void post_monitor_contended_entered(JavaThread *thread, ObjectMonitor *obj_mntr) KERNEL_RETURN; duke@435: static void post_monitor_wait(JavaThread *thread, oop obj, jlong timeout) KERNEL_RETURN; duke@435: static void post_monitor_waited(JavaThread *thread, ObjectMonitor *obj_mntr, jboolean timed_out) KERNEL_RETURN; duke@435: static void post_object_free(JvmtiEnv* env, jlong tag) KERNEL_RETURN; duke@435: static void post_resource_exhausted(jint resource_exhausted_flags, const char* detail) KERNEL_RETURN; duke@435: static void record_vm_internal_object_allocation(oop object) KERNEL_RETURN; duke@435: // Post objects collected by vm_object_alloc_event_collector. duke@435: static void post_vm_object_alloc(JavaThread *thread, oop object) KERNEL_RETURN; duke@435: // Collects vm internal objects for later event posting. duke@435: inline static void vm_object_alloc_event_collector(oop object) { duke@435: if (should_post_vm_object_alloc()) { duke@435: record_vm_internal_object_allocation(object); duke@435: } duke@435: } duke@435: duke@435: static void cleanup_thread (JavaThread* thread) KERNEL_RETURN; duke@435: duke@435: static void oops_do(OopClosure* f) KERNEL_RETURN; duke@435: duke@435: static void transition_pending_onload_raw_monitors() KERNEL_RETURN; duke@435: duke@435: #ifndef SERVICES_KERNEL duke@435: // attach support duke@435: static jint load_agent_library(AttachOperation* op, outputStream* out); duke@435: #endif // SERVICES_KERNEL duke@435: duke@435: // SetNativeMethodPrefix support duke@435: static char** get_all_native_method_prefixes(int* count_ptr); duke@435: }; duke@435: duke@435: // Support class used by JvmtiDynamicCodeEventCollector and others. It duke@435: // describes a single code blob by name and address range. duke@435: class JvmtiCodeBlobDesc : public CHeapObj { duke@435: private: duke@435: char _name[64]; duke@435: address _code_begin; duke@435: address _code_end; duke@435: duke@435: public: duke@435: JvmtiCodeBlobDesc(const char *name, address code_begin, address code_end) { duke@435: assert(name != NULL, "all code blobs must be named"); duke@435: strncpy(_name, name, sizeof(_name)); duke@435: _name[sizeof(_name)-1] = '\0'; duke@435: _code_begin = code_begin; duke@435: _code_end = code_end; duke@435: } duke@435: char* name() { return _name; } duke@435: address code_begin() { return _code_begin; } duke@435: address code_end() { return _code_end; } duke@435: }; duke@435: duke@435: // JvmtiEventCollector is a helper class to setup thread for duke@435: // event collection. duke@435: class JvmtiEventCollector : public StackObj { duke@435: private: duke@435: JvmtiEventCollector* _prev; // Save previous one to support nested event collector. duke@435: duke@435: public: duke@435: void setup_jvmti_thread_state(); // Set this collector in current thread. duke@435: void unset_jvmti_thread_state(); // Reset previous collector in current thread. duke@435: virtual bool is_dynamic_code_event() { return false; } duke@435: virtual bool is_vm_object_alloc_event(){ return false; } duke@435: JvmtiEventCollector *get_prev() { return _prev; } duke@435: }; duke@435: duke@435: // A JvmtiDynamicCodeEventCollector is a helper class for the JvmtiExport duke@435: // interface. It collects "dynamic code generated" events that are posted duke@435: // while holding locks. When the event collector goes out of scope the duke@435: // events will be posted. duke@435: // duke@435: // Usage :- duke@435: // duke@435: // { duke@435: // JvmtiDynamicCodeEventCollector event_collector; duke@435: // : duke@435: // { MutexLocker ml(...) duke@435: // : duke@435: // JvmtiExport::post_dynamic_code_generated_while_holding_locks(...) duke@435: // } duke@435: // // event collector goes out of scope => post events to profiler. duke@435: // } duke@435: duke@435: class JvmtiDynamicCodeEventCollector : public JvmtiEventCollector { duke@435: private: duke@435: GrowableArray* _code_blobs; // collected code blob events duke@435: duke@435: friend class JvmtiExport; duke@435: void register_stub(const char* name, address start, address end); duke@435: duke@435: public: duke@435: JvmtiDynamicCodeEventCollector() KERNEL_RETURN; duke@435: ~JvmtiDynamicCodeEventCollector() KERNEL_RETURN; duke@435: bool is_dynamic_code_event() { return true; } duke@435: duke@435: }; duke@435: duke@435: // Used to record vm internally allocated object oops and post duke@435: // vm object alloc event for objects visible to java world. duke@435: // Constructor enables JvmtiThreadState flag and all vm allocated duke@435: // objects are recorded in a growable array. When destructor is duke@435: // called the vm object alloc event is posted for each objects duke@435: // visible to java world. duke@435: // See jvm.cpp file for its usage. duke@435: // duke@435: class JvmtiVMObjectAllocEventCollector : public JvmtiEventCollector { duke@435: private: duke@435: GrowableArray* _allocated; // field to record vm internally allocated object oop. duke@435: bool _enable; // This flag is enabled in constructor and disabled duke@435: // in destructor before posting event. To avoid duke@435: // collection of objects allocated while running java code inside duke@435: // agent post_vm_object_alloc() event handler. duke@435: duke@435: //GC support duke@435: void oops_do(OopClosure* f); duke@435: duke@435: friend class JvmtiExport; duke@435: // Record vm allocated object oop. duke@435: inline void record_allocation(oop obj); duke@435: duke@435: //GC support duke@435: static void oops_do_for_all_threads(OopClosure* f); duke@435: duke@435: public: duke@435: JvmtiVMObjectAllocEventCollector() KERNEL_RETURN; duke@435: ~JvmtiVMObjectAllocEventCollector() KERNEL_RETURN; duke@435: bool is_vm_object_alloc_event() { return true; } duke@435: duke@435: bool is_enabled() { return _enable; } duke@435: void set_enabled(bool on) { _enable = on; } duke@435: }; duke@435: duke@435: duke@435: duke@435: // Marker class to disable the posting of VMObjectAlloc events duke@435: // within its scope. duke@435: // duke@435: // Usage :- duke@435: // duke@435: // { duke@435: // NoJvmtiVMObjectAllocMark njm; duke@435: // : duke@435: // // VMObjAlloc event will not be posted duke@435: // JvmtiExport::vm_object_alloc_event_collector(obj); duke@435: // : duke@435: // } duke@435: duke@435: class NoJvmtiVMObjectAllocMark : public StackObj { duke@435: private: duke@435: // enclosing collector if enabled, NULL otherwise duke@435: JvmtiVMObjectAllocEventCollector *_collector; duke@435: duke@435: bool was_enabled() { return _collector != NULL; } duke@435: duke@435: public: duke@435: NoJvmtiVMObjectAllocMark() KERNEL_RETURN; duke@435: ~NoJvmtiVMObjectAllocMark() KERNEL_RETURN; duke@435: }; duke@435: duke@435: duke@435: // Base class for reporting GC events to JVMTI. duke@435: class JvmtiGCMarker : public StackObj { kamg@2445: public: kamg@2445: JvmtiGCMarker() KERNEL_RETURN; kamg@2445: ~JvmtiGCMarker() KERNEL_RETURN; duke@435: }; duke@435: duke@435: // JvmtiHideSingleStepping is a helper class for hiding duke@435: // internal single step events. duke@435: class JvmtiHideSingleStepping : public StackObj { duke@435: private: duke@435: bool _single_step_hidden; duke@435: JavaThread * _thread; duke@435: duke@435: public: duke@435: JvmtiHideSingleStepping(JavaThread * thread) { duke@435: assert(thread != NULL, "sanity check"); duke@435: duke@435: _single_step_hidden = false; duke@435: _thread = thread; duke@435: if (JvmtiExport::should_post_single_step()) { duke@435: _single_step_hidden = JvmtiExport::hide_single_stepping(_thread); duke@435: } duke@435: } duke@435: duke@435: ~JvmtiHideSingleStepping() { duke@435: if (_single_step_hidden) { duke@435: JvmtiExport::expose_single_stepping(_thread); duke@435: } duke@435: } duke@435: }; duke@435: stefank@2314: #endif // SHARE_VM_PRIMS_JVMTIEXPORT_HPP