jdk

jvmtiExport.cpp
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/*
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 * Copyright (c) 2003, 2024, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "classfile/javaClasses.inline.hpp"
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#include "classfile/moduleEntry.hpp"
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#include "classfile/vmClasses.hpp"
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#include "classfile/vmSymbols.hpp"
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#include "code/nmethod.hpp"
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#include "code/pcDesc.hpp"
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#include "code/scopeDesc.hpp"
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#include "gc/shared/oopStorageSet.hpp"
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#include "interpreter/interpreter.hpp"
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#include "jvmtifiles/jvmtiEnv.hpp"
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#include "logging/log.hpp"
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#include "logging/logStream.hpp"
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#include "memory/allocation.inline.hpp"
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#include "memory/resourceArea.hpp"
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#include "memory/universe.hpp"
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#include "oops/klass.inline.hpp"
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#include "oops/objArrayKlass.hpp"
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#include "oops/objArrayOop.hpp"
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#include "oops/oop.inline.hpp"
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#include "oops/oopHandle.inline.hpp"
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#include "prims/jvmtiAgentList.hpp"
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#include "prims/jvmtiCodeBlobEvents.hpp"
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#include "prims/jvmtiEventController.hpp"
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#include "prims/jvmtiEventController.inline.hpp"
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#include "prims/jvmtiExport.hpp"
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#include "prims/jvmtiImpl.hpp"
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#include "prims/jvmtiManageCapabilities.hpp"
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#include "prims/jvmtiRawMonitor.hpp"
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#include "prims/jvmtiRedefineClasses.hpp"
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#include "prims/jvmtiTagMap.hpp"
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#include "prims/jvmtiThreadState.inline.hpp"
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#include "runtime/arguments.hpp"
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#include "runtime/fieldDescriptor.inline.hpp"
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#include "runtime/handles.inline.hpp"
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#include "runtime/interfaceSupport.inline.hpp"
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#include "runtime/javaCalls.hpp"
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#include "runtime/javaThread.hpp"
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#include "runtime/jniHandles.inline.hpp"
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#include "runtime/keepStackGCProcessed.hpp"
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#include "runtime/objectMonitor.hpp"
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#include "runtime/objectMonitor.inline.hpp"
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#include "runtime/os.hpp"
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#include "runtime/osThread.hpp"
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#include "runtime/safepointVerifiers.hpp"
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#include "runtime/serviceThread.hpp"
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#include "runtime/threads.hpp"
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#include "runtime/threadSMR.hpp"
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#include "runtime/vframe.inline.hpp"
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#include "runtime/vm_version.hpp"
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#include "utilities/macros.hpp"
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#ifdef JVMTI_TRACE
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#define EVT_TRACE(evt,out) if ((JvmtiTrace::event_trace_flags(evt) & JvmtiTrace::SHOW_EVENT_SENT) != 0) { SafeResourceMark rm; log_trace(jvmti) out; }
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#define EVT_TRIG_TRACE(evt,out) if ((JvmtiTrace::event_trace_flags(evt) & JvmtiTrace::SHOW_EVENT_TRIGGER) != 0) { SafeResourceMark rm; log_trace(jvmti) out; }
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#else
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#define EVT_TRIG_TRACE(evt,out)
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#define EVT_TRACE(evt,out)
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#endif
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///////////////////////////////////////////////////////////////
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//
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// JvmtiEventTransition
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//
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// TO DO --
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//  more handle purging
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// Use this for JavaThreads and state is  _thread_in_vm.
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class JvmtiJavaThreadEventTransition : StackObj {
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private:
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  ResourceMark _rm;
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  ThreadToNativeFromVM _transition;
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  HandleMark _hm;
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public:
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  JvmtiJavaThreadEventTransition(JavaThread *thread) :
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    _rm(),
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    _transition(thread),
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    _hm(thread)  {};
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};
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// For JavaThreads which are not in _thread_in_vm state
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// and other system threads use this.
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class JvmtiThreadEventTransition : StackObj {
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private:
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  ResourceMark _rm;
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  HandleMark _hm;
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  JavaThreadState _saved_state;
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  JavaThread *_jthread;
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public:
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  JvmtiThreadEventTransition(Thread *thread) : _rm(), _hm(thread) {
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    if (thread->is_Java_thread()) {
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       _jthread = JavaThread::cast(thread);
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       _saved_state = _jthread->thread_state();
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       if (_saved_state == _thread_in_Java) {
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         ThreadStateTransition::transition_from_java(_jthread, _thread_in_native);
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       } else {
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         ThreadStateTransition::transition_from_vm(_jthread, _thread_in_native);
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       }
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    } else {
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      _jthread = nullptr;
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    }
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  }
129

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  ~JvmtiThreadEventTransition() {
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    if (_jthread != nullptr)
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      ThreadStateTransition::transition_from_native(_jthread, _saved_state);
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  }
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};
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///////////////////////////////////////////////////////////////
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//
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// JvmtiEventMark
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//
141

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class JvmtiEventMark : public StackObj {
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private:
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  JavaThread *_thread;
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  JNIEnv* _jni_env;
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  JvmtiThreadState::ExceptionState _saved_exception_state;
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public:
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  JvmtiEventMark(JavaThread *thread) :  _thread(thread),
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                                        _jni_env(thread->jni_environment()),
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                                        _saved_exception_state(JvmtiThreadState::ES_CLEARED) {
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    JvmtiThreadState *state = thread->jvmti_thread_state();
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    // we are before an event.
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    // Save current jvmti thread exception state.
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    if (state != nullptr) {
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      _saved_exception_state = state->get_exception_state();
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    }
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    thread->push_jni_handle_block();
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    assert(thread == JavaThread::current(), "thread must be current!");
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    thread->frame_anchor()->make_walkable();
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  };
163

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  ~JvmtiEventMark() {
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    _thread->pop_jni_handle_block();
166

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    JvmtiThreadState* state = _thread->jvmti_thread_state();
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    // we are continuing after an event.
169
    if (state != nullptr) {
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      // Restore the jvmti thread exception state.
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      state->restore_exception_state(_saved_exception_state);
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    }
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  }
174

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  jobject to_jobject(oop obj) { return JNIHandles::make_local(_thread,obj); }
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177
  jclass to_jclass(Klass* klass) { return (klass == nullptr ? nullptr : (jclass)to_jobject(klass->java_mirror())); }
178

179
  jmethodID to_jmethodID(const methodHandle& method) { return method->jmethod_id(); }
180

181
  JNIEnv* jni_env() { return _jni_env; }
182
};
183

184
class JvmtiThreadEventMark : public JvmtiEventMark {
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private:
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  jobject _jthread;
187

188
public:
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  JvmtiThreadEventMark(JavaThread *thread) :
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    JvmtiEventMark(thread) {
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    _jthread = to_jobject(thread->threadObj());
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  };
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 jthread jni_thread() { return (jthread)_jthread; }
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};
195

196
class JvmtiVirtualThreadEventMark : public JvmtiEventMark {
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private:
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  jobject _jthread;
199

200
public:
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  JvmtiVirtualThreadEventMark(JavaThread *thread) :
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    JvmtiEventMark(thread) {
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    assert(thread->vthread() != nullptr || thread->threadObj() == nullptr, "sanity check");
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    _jthread = to_jobject(thread->vthread());
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  };
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  jthread jni_thread() { return (jthread)_jthread; }
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};
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class JvmtiClassEventMark : public JvmtiVirtualThreadEventMark {
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private:
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  jclass _jc;
212

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public:
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  JvmtiClassEventMark(JavaThread *thread, Klass* klass) :
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    JvmtiVirtualThreadEventMark(thread) {
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    _jc = to_jclass(klass);
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  };
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  jclass jni_class() { return _jc; }
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};
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class JvmtiMethodEventMark : public JvmtiVirtualThreadEventMark {
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private:
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  jmethodID _mid;
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public:
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  JvmtiMethodEventMark(JavaThread *thread, const methodHandle& method) :
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    JvmtiVirtualThreadEventMark(thread),
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    _mid(to_jmethodID(method)) {};
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  jmethodID jni_methodID() { return _mid; }
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};
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class JvmtiLocationEventMark : public JvmtiMethodEventMark {
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private:
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  jlocation _loc;
235

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public:
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  JvmtiLocationEventMark(JavaThread *thread, const methodHandle& method, address location) :
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    JvmtiMethodEventMark(thread, method),
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    _loc(location - method->code_base()) {};
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  jlocation location() { return _loc; }
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};
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class JvmtiExceptionEventMark : public JvmtiLocationEventMark {
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private:
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  jobject _exc;
246

247
public:
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  JvmtiExceptionEventMark(JavaThread *thread, const methodHandle& method, address location, Handle exception) :
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    JvmtiLocationEventMark(thread, method, location),
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    _exc(to_jobject(exception())) {};
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  jobject exception() { return _exc; }
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};
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class JvmtiClassFileLoadEventMark : public JvmtiThreadEventMark {
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private:
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  const char *_class_name;
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  jobject _jloader;
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  jobject _protection_domain;
259
  jclass  _class_being_redefined;
260

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public:
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  JvmtiClassFileLoadEventMark(JavaThread *thread, Symbol* name,
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     Handle class_loader, Handle prot_domain, Klass* class_being_redefined) : JvmtiThreadEventMark(thread) {
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      _class_name = name != nullptr? name->as_utf8() : nullptr;
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      _jloader = (jobject)to_jobject(class_loader());
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      _protection_domain = (jobject)to_jobject(prot_domain());
267
      if (class_being_redefined == nullptr) {
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        _class_being_redefined = nullptr;
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      } else {
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        _class_being_redefined = (jclass)to_jclass(class_being_redefined);
271
      }
272
  };
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  const char *class_name() {
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    return _class_name;
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  }
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  jobject jloader() {
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    return _jloader;
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  }
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  jobject protection_domain() {
280
    return _protection_domain;
281
  }
282
  jclass class_being_redefined() {
283
    return _class_being_redefined;
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  }
285
};
286

287
//////////////////////////////////////////////////////////////////////////////
288

289
int               JvmtiExport::_field_access_count                        = 0;
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int               JvmtiExport::_field_modification_count                  = 0;
291

292
bool              JvmtiExport::_can_access_local_variables                = false;
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bool              JvmtiExport::_can_hotswap_or_post_breakpoint            = false;
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bool              JvmtiExport::_can_modify_any_class                      = false;
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bool              JvmtiExport::_can_walk_any_space                        = false;
296

297
uint64_t          JvmtiExport::_redefinition_count                        = 0;
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bool              JvmtiExport::_all_dependencies_are_recorded             = false;
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300
//
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// field access management
302
//
303

304
// interpreter generator needs the address of the counter
305
address JvmtiExport::get_field_access_count_addr() {
306
  // We don't grab a lock because we don't want to
307
  // serialize field access between all threads. This means that a
308
  // thread on another processor can see the wrong count value and
309
  // may either miss making a needed call into post_field_access()
310
  // or will make an unneeded call into post_field_access(). We pay
311
  // this price to avoid slowing down the VM when we aren't watching
312
  // field accesses.
313
  // Other access/mutation safe by virtue of being in VM state.
314
  return (address)(&_field_access_count);
315
}
316

317
//
318
// field modification management
319
//
320

321
// interpreter generator needs the address of the counter
322
address JvmtiExport::get_field_modification_count_addr() {
323
  // We don't grab a lock because we don't
324
  // want to serialize field modification between all threads. This
325
  // means that a thread on another processor can see the wrong
326
  // count value and may either miss making a needed call into
327
  // post_field_modification() or will make an unneeded call into
328
  // post_field_modification(). We pay this price to avoid slowing
329
  // down the VM when we aren't watching field modifications.
330
  // Other access/mutation safe by virtue of being in VM state.
331
  return (address)(&_field_modification_count);
332
}
333

334

335
///////////////////////////////////////////////////////////////
336
// Functions needed by java.lang.instrument for starting up javaagent.
337
///////////////////////////////////////////////////////////////
338

339
jint
340
JvmtiExport::get_jvmti_interface(JavaVM *jvm, void **penv, jint version) {
341
  // The JVMTI_VERSION_INTERFACE_JVMTI part of the version number
342
  // has already been validated in JNI GetEnv().
343
  int major, minor, micro;
344

345
  // micro version doesn't matter here (yet?)
346
  decode_version_values(version, &major, &minor, &micro);
347
  switch (major) {
348
    case 1:
349
      switch (minor) {
350
        case 0:  // version 1.0.<micro> is recognized
351
        case 1:  // version 1.1.<micro> is recognized
352
        case 2:  // version 1.2.<micro> is recognized
353
          break;
354

355
        default:
356
          return JNI_EVERSION;  // unsupported minor version number
357
      }
358
      break;
359
    case 9:
360
      switch (minor) {
361
        case 0:  // version 9.0.<micro> is recognized
362
          break;
363
        default:
364
          return JNI_EVERSION;  // unsupported minor version number
365
      }
366
      break;
367
    case 11:
368
      switch (minor) {
369
        case 0:  // version 11.0.<micro> is recognized
370
          break;
371
        default:
372
          return JNI_EVERSION;  // unsupported minor version number
373
      }
374
      break;
375
    default:
376
      // Starting from 13 we do not care about minor version anymore
377
      if (major < 13 || major > VM_Version::vm_major_version()) {
378
        return JNI_EVERSION;  // unsupported major version number
379
      }
380
  }
381

382
  if (JvmtiEnv::get_phase() == JVMTI_PHASE_LIVE) {
383
    JavaThread* current_thread = JavaThread::current();
384
    // transition code: native to VM
385
    MACOS_AARCH64_ONLY(ThreadWXEnable __wx(WXWrite, current_thread));
386
    ThreadInVMfromNative __tiv(current_thread);
387
    VM_ENTRY_BASE(jvmtiEnv*, JvmtiExport::get_jvmti_interface, current_thread)
388
    debug_only(VMNativeEntryWrapper __vew;)
389

390
    JvmtiEnv *jvmti_env = JvmtiEnv::create_a_jvmti(version);
391
    *penv = jvmti_env->jvmti_external();  // actual type is jvmtiEnv* -- not to be confused with JvmtiEnv*
392

393
    if (Continuations::enabled()) {
394
      // Virtual threads support for agents loaded into running VM.
395
      // There is a performance impact when VTMS transitions are enabled.
396
      if (!JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
397
        JvmtiEnvBase::enable_virtual_threads_notify_jvmti();
398
      }
399
    }
400
    return JNI_OK;
401

402
  } else if (JvmtiEnv::get_phase() == JVMTI_PHASE_ONLOAD) {
403
    // not live, no thread to transition
404
    JvmtiEnv *jvmti_env = JvmtiEnv::create_a_jvmti(version);
405
    *penv = jvmti_env->jvmti_external();  // actual type is jvmtiEnv* -- not to be confused with JvmtiEnv*
406

407
    if (Continuations::enabled()) {
408
      // Virtual threads support for agents loaded at startup.
409
      // There is a performance impact when VTMS transitions are enabled.
410
      JvmtiVTMSTransitionDisabler::set_VTMS_notify_jvmti_events(true);
411
    }
412
    return JNI_OK;
413

414
  } else {
415
    // Called at the wrong time
416
    *penv = nullptr;
417
    return JNI_EDETACHED;
418
  }
419
}
420

421
JvmtiThreadState*
422
JvmtiExport::get_jvmti_thread_state(JavaThread *thread) {
423
  assert(thread == JavaThread::current(), "must be current thread");
424
  if (thread->is_vthread_mounted() && thread->jvmti_thread_state() == nullptr) {
425
    JvmtiEventController::thread_started(thread);
426
  }
427
  return thread->jvmti_thread_state();
428
}
429

430
void
431
JvmtiExport::add_default_read_edges(Handle h_module, TRAPS) {
432
  if (!Universe::is_module_initialized()) {
433
    return; // extra safety
434
  }
435
  assert(!h_module.is_null(), "module should always be set");
436

437
  // Invoke the transformedByAgent method
438
  JavaValue result(T_VOID);
439
  JavaCalls::call_static(&result,
440
                         vmClasses::module_Modules_klass(),
441
                         vmSymbols::transformedByAgent_name(),
442
                         vmSymbols::transformedByAgent_signature(),
443
                         h_module,
444
                         THREAD);
445

446
  if (HAS_PENDING_EXCEPTION) {
447
    LogTarget(Trace, jvmti) log;
448
    LogStream log_stream(log);
449
    java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream);
450
    log_stream.cr();
451
    CLEAR_PENDING_EXCEPTION;
452
    return;
453
  }
454
}
455

456
jvmtiError
457
JvmtiExport::add_module_reads(Handle module, Handle to_module, TRAPS) {
458
  if (!Universe::is_module_initialized()) {
459
    return JVMTI_ERROR_NONE; // extra safety
460
  }
461
  assert(!module.is_null(), "module should always be set");
462
  assert(!to_module.is_null(), "to_module should always be set");
463

464
  // Invoke the addReads method
465
  JavaValue result(T_VOID);
466
  JavaCalls::call_static(&result,
467
                         vmClasses::module_Modules_klass(),
468
                         vmSymbols::addReads_name(),
469
                         vmSymbols::addReads_signature(),
470
                         module,
471
                         to_module,
472
                         THREAD);
473

474
  if (HAS_PENDING_EXCEPTION) {
475
    LogTarget(Trace, jvmti) log;
476
    LogStream log_stream(log);
477
    java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream);
478
    log_stream.cr();
479
    CLEAR_PENDING_EXCEPTION;
480
    return JVMTI_ERROR_INTERNAL;
481
  }
482
  return JVMTI_ERROR_NONE;
483
}
484

485
jvmtiError
486
JvmtiExport::add_module_exports(Handle module, Handle pkg_name, Handle to_module, TRAPS) {
487
  if (!Universe::is_module_initialized()) {
488
    return JVMTI_ERROR_NONE; // extra safety
489
  }
490
  assert(!module.is_null(), "module should always be set");
491
  assert(!to_module.is_null(), "to_module should always be set");
492
  assert(!pkg_name.is_null(), "pkg_name should always be set");
493

494
  // Invoke the addExports method
495
  JavaValue result(T_VOID);
496
  JavaCalls::call_static(&result,
497
                         vmClasses::module_Modules_klass(),
498
                         vmSymbols::addExports_name(),
499
                         vmSymbols::addExports_signature(),
500
                         module,
501
                         pkg_name,
502
                         to_module,
503
                         THREAD);
504

505
  if (HAS_PENDING_EXCEPTION) {
506
    Symbol* ex_name = PENDING_EXCEPTION->klass()->name();
507
    LogTarget(Trace, jvmti) log;
508
    LogStream log_stream(log);
509
    java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream);
510
    log_stream.cr();
511
    CLEAR_PENDING_EXCEPTION;
512
    if (ex_name == vmSymbols::java_lang_IllegalArgumentException()) {
513
      return JVMTI_ERROR_ILLEGAL_ARGUMENT;
514
    }
515
    return JVMTI_ERROR_INTERNAL;
516
  }
517
  return JVMTI_ERROR_NONE;
518
}
519

520
jvmtiError
521
JvmtiExport::add_module_opens(Handle module, Handle pkg_name, Handle to_module, TRAPS) {
522
  if (!Universe::is_module_initialized()) {
523
    return JVMTI_ERROR_NONE; // extra safety
524
  }
525
  assert(!module.is_null(), "module should always be set");
526
  assert(!to_module.is_null(), "to_module should always be set");
527
  assert(!pkg_name.is_null(), "pkg_name should always be set");
528

529
  // Invoke the addOpens method
530
  JavaValue result(T_VOID);
531
  JavaCalls::call_static(&result,
532
                         vmClasses::module_Modules_klass(),
533
                         vmSymbols::addOpens_name(),
534
                         vmSymbols::addExports_signature(),
535
                         module,
536
                         pkg_name,
537
                         to_module,
538
                         THREAD);
539

540
  if (HAS_PENDING_EXCEPTION) {
541
    Symbol* ex_name = PENDING_EXCEPTION->klass()->name();
542
    LogTarget(Trace, jvmti) log;
543
    LogStream log_stream(log);
544
    java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream);
545
    log_stream.cr();
546
    CLEAR_PENDING_EXCEPTION;
547
    if (ex_name == vmSymbols::java_lang_IllegalArgumentException()) {
548
      return JVMTI_ERROR_ILLEGAL_ARGUMENT;
549
    }
550
    return JVMTI_ERROR_INTERNAL;
551
  }
552
  return JVMTI_ERROR_NONE;
553
}
554

555
jvmtiError
556
JvmtiExport::add_module_uses(Handle module, Handle service, TRAPS) {
557
  if (!Universe::is_module_initialized()) {
558
    return JVMTI_ERROR_NONE; // extra safety
559
  }
560
  assert(!module.is_null(), "module should always be set");
561
  assert(!service.is_null(), "service should always be set");
562

563
  // Invoke the addUses method
564
  JavaValue result(T_VOID);
565
  JavaCalls::call_static(&result,
566
                         vmClasses::module_Modules_klass(),
567
                         vmSymbols::addUses_name(),
568
                         vmSymbols::addUses_signature(),
569
                         module,
570
                         service,
571
                         THREAD);
572

573
  if (HAS_PENDING_EXCEPTION) {
574
    LogTarget(Trace, jvmti) log;
575
    LogStream log_stream(log);
576
    java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream);
577
    log_stream.cr();
578
    CLEAR_PENDING_EXCEPTION;
579
    return JVMTI_ERROR_INTERNAL;
580
  }
581
  return JVMTI_ERROR_NONE;
582
}
583

584
jvmtiError
585
JvmtiExport::add_module_provides(Handle module, Handle service, Handle impl_class, TRAPS) {
586
  if (!Universe::is_module_initialized()) {
587
    return JVMTI_ERROR_NONE; // extra safety
588
  }
589
  assert(!module.is_null(), "module should always be set");
590
  assert(!service.is_null(), "service should always be set");
591
  assert(!impl_class.is_null(), "impl_class should always be set");
592

593
  // Invoke the addProvides method
594
  JavaValue result(T_VOID);
595
  JavaCalls::call_static(&result,
596
                         vmClasses::module_Modules_klass(),
597
                         vmSymbols::addProvides_name(),
598
                         vmSymbols::addProvides_signature(),
599
                         module,
600
                         service,
601
                         impl_class,
602
                         THREAD);
603

604
  if (HAS_PENDING_EXCEPTION) {
605
    LogTarget(Trace, jvmti) log;
606
    LogStream log_stream(log);
607
    java_lang_Throwable::print(PENDING_EXCEPTION, &log_stream);
608
    log_stream.cr();
609
    CLEAR_PENDING_EXCEPTION;
610
    return JVMTI_ERROR_INTERNAL;
611
  }
612
  return JVMTI_ERROR_NONE;
613
}
614

615
void
616
JvmtiExport::decode_version_values(jint version, int * major, int * minor,
617
                                   int * micro) {
618
  *major = (version & JVMTI_VERSION_MASK_MAJOR) >> JVMTI_VERSION_SHIFT_MAJOR;
619
  *minor = (version & JVMTI_VERSION_MASK_MINOR) >> JVMTI_VERSION_SHIFT_MINOR;
620
  *micro = (version & JVMTI_VERSION_MASK_MICRO) >> JVMTI_VERSION_SHIFT_MICRO;
621
}
622

623
void JvmtiExport::enter_primordial_phase() {
624
  JvmtiEnvBase::set_phase(JVMTI_PHASE_PRIMORDIAL);
625
}
626

627
void JvmtiExport::enter_early_start_phase() {
628
  set_early_vmstart_recorded(true);
629
}
630

631
void JvmtiExport::enter_start_phase() {
632
  JvmtiEnvBase::set_phase(JVMTI_PHASE_START);
633
}
634

635
void JvmtiExport::enter_onload_phase() {
636
  JvmtiEnvBase::set_phase(JVMTI_PHASE_ONLOAD);
637
}
638

639
void JvmtiExport::enter_live_phase() {
640
  JvmtiEnvBase::set_phase(JVMTI_PHASE_LIVE);
641
}
642

643
//
644
// JVMTI events that the VM posts to the debugger and also startup agent
645
// and call the agent's premain() for java.lang.instrument.
646
//
647

648
void JvmtiExport::post_early_vm_start() {
649
  EVT_TRIG_TRACE(JVMTI_EVENT_VM_START, ("Trg Early VM start event triggered" ));
650

651
  // can now enable some events
652
  JvmtiEventController::vm_start();
653

654
  JvmtiEnvIterator it;
655
  for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
656
    // Only early vmstart envs post early VMStart event
657
    if (env->early_vmstart_env() && env->is_enabled(JVMTI_EVENT_VM_START)) {
658
      EVT_TRACE(JVMTI_EVENT_VM_START, ("Evt Early VM start event sent" ));
659
      JavaThread *thread  = JavaThread::current();
660
      JvmtiThreadEventMark jem(thread);
661
      JvmtiJavaThreadEventTransition jet(thread);
662
      jvmtiEventVMStart callback = env->callbacks()->VMStart;
663
      if (callback != nullptr) {
664
        (*callback)(env->jvmti_external(), jem.jni_env());
665
      }
666
    }
667
  }
668
}
669

670
void JvmtiExport::post_vm_start() {
671
  EVT_TRIG_TRACE(JVMTI_EVENT_VM_START, ("Trg VM start event triggered" ));
672

673
  // can now enable some events
674
  JvmtiEventController::vm_start();
675

676
  JvmtiEnvIterator it;
677
  for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
678
    // Early vmstart envs do not post normal VMStart event
679
    if (!env->early_vmstart_env() && env->is_enabled(JVMTI_EVENT_VM_START)) {
680
      EVT_TRACE(JVMTI_EVENT_VM_START, ("Evt VM start event sent" ));
681

682
      JavaThread *thread  = JavaThread::current();
683
      JvmtiThreadEventMark jem(thread);
684
      JvmtiJavaThreadEventTransition jet(thread);
685
      jvmtiEventVMStart callback = env->callbacks()->VMStart;
686
      if (callback != nullptr) {
687
        (*callback)(env->jvmti_external(), jem.jni_env());
688
      }
689
    }
690
  }
691
}
692

693
static OopStorage* _jvmti_oop_storage = nullptr;
694
static OopStorage* _weak_tag_storage = nullptr;
695

696
OopStorage* JvmtiExport::jvmti_oop_storage() {
697
  assert(_jvmti_oop_storage != nullptr, "not yet initialized");
698
  return _jvmti_oop_storage;
699
}
700

701
OopStorage* JvmtiExport::weak_tag_storage() {
702
  assert(_weak_tag_storage != nullptr, "not yet initialized");
703
  return _weak_tag_storage;
704
}
705

706
void JvmtiExport::initialize_oop_storage() {
707
  // OopStorage needs to be created early in startup and unconditionally
708
  // because of OopStorageSet static array indices.
709
  _jvmti_oop_storage = OopStorageSet::create_strong("JVMTI OopStorage", mtServiceability);
710
  _weak_tag_storage  = OopStorageSet::create_weak("JVMTI Tag Weak OopStorage", mtServiceability);
711
  _weak_tag_storage->register_num_dead_callback(&JvmtiTagMap::gc_notification);
712
}
713

714
// Lookup an agent from an JvmtiEnv. Return agent only if it is not yet initialized.
715
// An agent can create multiple JvmtiEnvs, but for agent initialization, we are only interested in the initial one.
716
static JvmtiAgent* lookup_uninitialized_agent(JvmtiEnv* env, void* callback) {
717
  JvmtiAgent* const agent = JvmtiAgentList::lookup(env, callback);
718
  return agent == nullptr || agent->is_initialized() ? nullptr : agent;
719
}
720

721
void JvmtiExport::post_vm_initialized() {
722
  EVT_TRIG_TRACE(JVMTI_EVENT_VM_INIT, ("Trg VM init event triggered" ));
723

724
  // can now enable events
725
  JvmtiEventController::vm_init();
726

727
  JvmtiEnvIterator it;
728
  for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
729
    if (env->is_enabled(JVMTI_EVENT_VM_INIT)) {
730
      EVT_TRACE(JVMTI_EVENT_VM_INIT, ("Evt VM init event sent" ));
731

732
      JavaThread *thread  = JavaThread::current();
733
      JvmtiThreadEventMark jem(thread);
734
      JvmtiJavaThreadEventTransition jet(thread);
735
      jvmtiEventVMInit callback = env->callbacks()->VMInit;
736
      if (callback != nullptr) {
737
        // We map the JvmtiEnv to its Agent to measure when and for how long
738
        // it took to initialize so that JFR can report this information.
739
        JvmtiAgent* const agent = lookup_uninitialized_agent(env, reinterpret_cast<void*>(callback));
740
        if (agent != nullptr) {
741
          agent->initialization_begin();
742
        }
743
        (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread());
744
        if (agent != nullptr) {
745
          agent->initialization_end();
746
        }
747
      }
748
    }
749
  }
750

751
  // Agents are initialized as part of posting the VMInit event above.
752
  // For -Xrun agents and agents with no VMInit callback, we explicitly ensure they are also initialized.
753
  // JVM_OnLoad and Agent_OnLoad callouts are performed too early for the proper timestamp logic.
754
  JvmtiAgentList::initialize();
755
}
756

757
void JvmtiExport::post_vm_death() {
758
  EVT_TRIG_TRACE(JVMTI_EVENT_VM_DEATH, ("Trg VM death event triggered" ));
759

760
  JvmtiTagMap::flush_all_object_free_events();
761

762
  JvmtiEnvIterator it;
763
  for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
764
    if (env->is_enabled(JVMTI_EVENT_VM_DEATH)) {
765
      EVT_TRACE(JVMTI_EVENT_VM_DEATH, ("Evt VM death event sent" ));
766

767
      JavaThread *thread  = JavaThread::current();
768
      JvmtiEventMark jem(thread);
769
      JvmtiJavaThreadEventTransition jet(thread);
770
      jvmtiEventVMDeath callback = env->callbacks()->VMDeath;
771
      if (callback != nullptr) {
772
        (*callback)(env->jvmti_external(), jem.jni_env());
773
      }
774
    }
775
  }
776

777
  JvmtiEnvBase::set_phase(JVMTI_PHASE_DEAD);
778
  JvmtiEventController::vm_death();
779
}
780

781
char**
782
JvmtiExport::get_all_native_method_prefixes(int* count_ptr) {
783
  // Have to grab JVMTI thread state lock to be sure environment doesn't
784
  // go away while we iterate them.  No locks during VM bring-up.
785
  if (Threads::number_of_threads() == 0 || SafepointSynchronize::is_at_safepoint()) {
786
    return JvmtiEnvBase::get_all_native_method_prefixes(count_ptr);
787
  } else {
788
    MutexLocker mu(JvmtiThreadState_lock);
789
    return JvmtiEnvBase::get_all_native_method_prefixes(count_ptr);
790
  }
791
}
792

793
// Convert an external thread reference to a JavaThread found on the
794
// specified ThreadsList. The ThreadsListHandle in the caller "protects"
795
// the returned JavaThread *.
796
//
797
// If thread_oop_p is not null, then the caller wants to use the oop
798
// after this call so the oop is returned. On success, *jt_pp is set
799
// to the converted JavaThread * and JVMTI_ERROR_NONE is returned.
800
// On error, returns various JVMTI_ERROR_* values.
801
//
802
jvmtiError
803
JvmtiExport::cv_external_thread_to_JavaThread(ThreadsList * t_list,
804
                                              jthread thread,
805
                                              JavaThread ** jt_pp,
806
                                              oop * thread_oop_p) {
807
  assert(t_list != nullptr, "must have a ThreadsList");
808
  assert(jt_pp != nullptr, "must have a return JavaThread pointer");
809
  // thread_oop_p is optional so no assert()
810

811
  if (thread_oop_p != nullptr) {
812
    *thread_oop_p = nullptr;
813
  }
814

815
  oop thread_oop = JNIHandles::resolve_external_guard(thread);
816
  if (thread_oop == nullptr) {
817
    // null jthread, GC'ed jthread or a bad JNI handle.
818
    return JVMTI_ERROR_INVALID_THREAD;
819
  }
820
  // Looks like an oop at this point.
821

822
  if (!thread_oop->is_a(vmClasses::Thread_klass())) {
823
    // The oop is not a java.lang.Thread.
824
    return JVMTI_ERROR_INVALID_THREAD;
825
  }
826
  // Looks like a java.lang.Thread oop at this point.
827

828
  if (thread_oop_p != nullptr) {
829
    // Return the oop to the caller; the caller may still want
830
    // the oop even if this function returns an error.
831
    *thread_oop_p = thread_oop;
832
  }
833

834
  JavaThread * java_thread = java_lang_Thread::thread(thread_oop);
835
  if (java_thread == nullptr) {
836
    if (java_lang_VirtualThread::is_instance(thread_oop)) {
837
      return JVMTI_ERROR_INVALID_THREAD;
838
    }
839
    // The java.lang.Thread does not contain a JavaThread * so it has
840
    // not yet run or it has died.
841
    return JVMTI_ERROR_THREAD_NOT_ALIVE;
842
  }
843
  // Looks like a live JavaThread at this point.
844

845
  if (!t_list->includes(java_thread)) {
846
    // Not on the JavaThreads list so it is not alive.
847
    return JVMTI_ERROR_THREAD_NOT_ALIVE;
848
  }
849

850
  // Return a live JavaThread that is "protected" by the
851
  // ThreadsListHandle in the caller.
852
  *jt_pp = java_thread;
853

854
  return JVMTI_ERROR_NONE;
855
}
856

857
// Convert an oop to a JavaThread found on the specified ThreadsList.
858
// The ThreadsListHandle in the caller "protects" the returned
859
// JavaThread *.
860
//
861
// On success, *jt_pp is set to the converted JavaThread * and
862
// JVMTI_ERROR_NONE is returned. On error, returns various
863
// JVMTI_ERROR_* values.
864
//
865
jvmtiError
866
JvmtiExport::cv_oop_to_JavaThread(ThreadsList * t_list, oop thread_oop,
867
                                  JavaThread ** jt_pp) {
868
  assert(t_list != nullptr, "must have a ThreadsList");
869
  assert(thread_oop != nullptr, "must have an oop");
870
  assert(jt_pp != nullptr, "must have a return JavaThread pointer");
871

872
  if (!thread_oop->is_a(vmClasses::Thread_klass())) {
873
    // The oop is not a java.lang.Thread.
874
    return JVMTI_ERROR_INVALID_THREAD;
875
  }
876
  // Looks like a java.lang.Thread oop at this point.
877

878
  JavaThread * java_thread = java_lang_Thread::thread(thread_oop);
879
  if (java_thread == nullptr) {
880
    // The java.lang.Thread does not contain a JavaThread * so it has
881
    // not yet run or it has died.
882
    return JVMTI_ERROR_THREAD_NOT_ALIVE;
883
  }
884
  // Looks like a live JavaThread at this point.
885

886
  if (!t_list->includes(java_thread)) {
887
    // Not on the JavaThreads list so it is not alive.
888
    return JVMTI_ERROR_THREAD_NOT_ALIVE;
889
  }
890

891
  // Return a live JavaThread that is "protected" by the
892
  // ThreadsListHandle in the caller.
893
  *jt_pp = java_thread;
894

895
  return JVMTI_ERROR_NONE;
896
}
897

898
class JvmtiClassFileLoadHookPoster : public StackObj {
899
 private:
900
  Symbol*            _h_name;
901
  Handle               _class_loader;
902
  Handle               _h_protection_domain;
903
  unsigned char **     _data_ptr;
904
  unsigned char **     _end_ptr;
905
  JavaThread *         _thread;
906
  jint                 _curr_len;
907
  unsigned char *      _curr_data;
908
  JvmtiEnv *           _curr_env;
909
  JvmtiCachedClassFileData ** _cached_class_file_ptr;
910
  JvmtiThreadState *   _state;
911
  Klass*               _class_being_redefined;
912
  JvmtiClassLoadKind   _load_kind;
913
  bool                 _has_been_modified;
914

915
 public:
916
  inline JvmtiClassFileLoadHookPoster(Symbol* h_name, Handle class_loader,
917
                                      Handle h_protection_domain,
918
                                      unsigned char **data_ptr, unsigned char **end_ptr,
919
                                      JvmtiCachedClassFileData **cache_ptr) {
920
    _h_name = h_name;
921
    _class_loader = class_loader;
922
    _h_protection_domain = h_protection_domain;
923
    _data_ptr = data_ptr;
924
    _end_ptr = end_ptr;
925
    _thread = JavaThread::current();
926
    _curr_len = pointer_delta_as_int(*end_ptr, *data_ptr);
927
    _curr_data = *data_ptr;
928
    _curr_env = nullptr;
929
    _cached_class_file_ptr = cache_ptr;
930
    _has_been_modified = false;
931

932
    if (_thread->is_in_any_VTMS_transition()) {
933
      return; // no events should be posted if thread is in any VTMS transition
934
    }
935
    _state = JvmtiExport::get_jvmti_thread_state(_thread);
936
    if (_state != nullptr) {
937
      _class_being_redefined = _state->get_class_being_redefined();
938
      _load_kind = _state->get_class_load_kind();
939
      Klass* klass = (_class_being_redefined == nullptr) ? nullptr : _class_being_redefined;
940
      if (_load_kind != jvmti_class_load_kind_load && klass != nullptr) {
941
        ModuleEntry* module_entry = InstanceKlass::cast(klass)->module();
942
        assert(module_entry != nullptr, "module_entry should always be set");
943
        if (module_entry->is_named() &&
944
            module_entry->module() != nullptr &&
945
            !module_entry->has_default_read_edges()) {
946
          if (!module_entry->set_has_default_read_edges()) {
947
            // We won a potential race.
948
            // Add read edges to the unnamed modules of the bootstrap and app class loaders
949
            Handle class_module(_thread, module_entry->module()); // Obtain j.l.r.Module
950
            JvmtiExport::add_default_read_edges(class_module, _thread);
951
          }
952
        }
953
      }
954
      // Clear class_being_redefined flag here. The action
955
      // from agent handler could generate a new class file load
956
      // hook event and if it is not cleared the new event generated
957
      // from regular class file load could have this stale redefined
958
      // class handle info.
959
      _state->clear_class_being_redefined();
960
    } else {
961
      // redefine and retransform will always set the thread state
962
      _class_being_redefined = nullptr;
963
      _load_kind = jvmti_class_load_kind_load;
964
    }
965
  }
966

967
  void post() {
968
    post_all_envs();
969
    copy_modified_data();
970
  }
971

972
  bool has_been_modified() { return _has_been_modified; }
973

974
 private:
975
  void post_all_envs() {
976
    if (_load_kind != jvmti_class_load_kind_retransform) {
977
      // for class load and redefine,
978
      // call the non-retransformable agents
979
      JvmtiEnvIterator it;
980
      for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
981
        if (!env->is_retransformable() && env->is_enabled(JVMTI_EVENT_CLASS_FILE_LOAD_HOOK)) {
982
          // non-retransformable agents cannot retransform back,
983
          // so no need to cache the original class file bytes
984
          post_to_env(env, false);
985
        }
986
      }
987
    }
988
    JvmtiEnvIterator it;
989
    for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
990
      // retransformable agents get all events
991
      if (env->is_retransformable() && env->is_enabled(JVMTI_EVENT_CLASS_FILE_LOAD_HOOK)) {
992
        // retransformable agents need to cache the original class file
993
        // bytes if changes are made via the ClassFileLoadHook
994
        post_to_env(env, true);
995
      }
996
    }
997
  }
998

999
  void post_to_env(JvmtiEnv* env, bool caching_needed) {
1000
    if (env->phase() == JVMTI_PHASE_PRIMORDIAL && !env->early_class_hook_env()) {
1001
      return;
1002
    }
1003
    unsigned char *new_data = nullptr;
1004
    jint new_len = 0;
1005
    JvmtiClassFileLoadEventMark jem(_thread, _h_name, _class_loader,
1006
                                    _h_protection_domain,
1007
                                    _class_being_redefined);
1008
    JvmtiJavaThreadEventTransition jet(_thread);
1009
    jvmtiEventClassFileLoadHook callback = env->callbacks()->ClassFileLoadHook;
1010
    if (callback != nullptr) {
1011
      (*callback)(env->jvmti_external(), jem.jni_env(),
1012
                  jem.class_being_redefined(),
1013
                  jem.jloader(), jem.class_name(),
1014
                  jem.protection_domain(),
1015
                  _curr_len, _curr_data,
1016
                  &new_len, &new_data);
1017
    }
1018
    if (new_data != nullptr) {
1019
      // this agent has modified class data.
1020
      _has_been_modified = true;
1021
      if (caching_needed && *_cached_class_file_ptr == nullptr) {
1022
        // data has been changed by the new retransformable agent
1023
        // and it hasn't already been cached, cache it
1024
        JvmtiCachedClassFileData *p;
1025
        p = (JvmtiCachedClassFileData *)os::malloc(
1026
          offset_of(JvmtiCachedClassFileData, data) + _curr_len, mtInternal);
1027
        if (p == nullptr) {
1028
          vm_exit_out_of_memory(offset_of(JvmtiCachedClassFileData, data) + _curr_len,
1029
            OOM_MALLOC_ERROR,
1030
            "unable to allocate cached copy of original class bytes");
1031
        }
1032
        p->length = _curr_len;
1033
        memcpy(p->data, _curr_data, _curr_len);
1034
        *_cached_class_file_ptr = p;
1035
      }
1036

1037
      if (_curr_data != *_data_ptr) {
1038
        // curr_data is previous agent modified class data.
1039
        // And this has been changed by the new agent so
1040
        // we can delete it now.
1041
        _curr_env->Deallocate(_curr_data);
1042
      }
1043

1044
      // Class file data has changed by the current agent.
1045
      _curr_data = new_data;
1046
      _curr_len = new_len;
1047
      // Save the current agent env we need this to deallocate the
1048
      // memory allocated by this agent.
1049
      _curr_env = env;
1050
    }
1051
  }
1052

1053
  void copy_modified_data() {
1054
    // if one of the agent has modified class file data.
1055
    // Copy modified class data to new resources array.
1056
    if (_curr_data != *_data_ptr) {
1057
      *_data_ptr = NEW_RESOURCE_ARRAY(u1, _curr_len);
1058
      memcpy(*_data_ptr, _curr_data, _curr_len);
1059
      *_end_ptr = *_data_ptr + _curr_len;
1060
      _curr_env->Deallocate(_curr_data);
1061
    }
1062
  }
1063
};
1064

1065
bool JvmtiExport::is_early_phase() {
1066
  return JvmtiEnvBase::get_phase() <= JVMTI_PHASE_PRIMORDIAL;
1067
}
1068

1069
bool JvmtiExport::has_early_class_hook_env() {
1070
  JvmtiEnvIterator it;
1071
  for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
1072
    if (env->early_class_hook_env()) {
1073
      return true;
1074
    }
1075
  }
1076
  return false;
1077
}
1078

1079
bool JvmtiExport::_should_post_class_file_load_hook = false;
1080

1081
// This flag is read by C2 during VM internal objects allocation
1082
int JvmtiExport::_should_notify_object_alloc = 0;
1083

1084
// this entry is for class file load hook on class load, redefine and retransform
1085
bool JvmtiExport::post_class_file_load_hook(Symbol* h_name,
1086
                                            Handle class_loader,
1087
                                            Handle h_protection_domain,
1088
                                            unsigned char **data_ptr,
1089
                                            unsigned char **end_ptr,
1090
                                            JvmtiCachedClassFileData **cache_ptr) {
1091
  if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1092
    return false;
1093
  }
1094
  if (JavaThread::current()->is_in_tmp_VTMS_transition()) {
1095
    return false; // skip CFLH events in tmp VTMS transition
1096
  }
1097

1098
  JvmtiClassFileLoadHookPoster poster(h_name, class_loader,
1099
                                      h_protection_domain,
1100
                                      data_ptr, end_ptr,
1101
                                      cache_ptr);
1102
  poster.post();
1103
  return poster.has_been_modified();
1104
}
1105

1106
void JvmtiExport::report_unsupported(bool on) {
1107
  // If any JVMTI service is turned on, we need to exit before native code
1108
  // tries to access nonexistent services.
1109
  if (on) {
1110
    vm_exit_during_initialization("Java Kernel does not support JVMTI.");
1111
  }
1112
}
1113

1114

1115
static inline Klass* oop_to_klass(oop obj) {
1116
  Klass* k = obj->klass();
1117

1118
  // if the object is a java.lang.Class then return the java mirror
1119
  if (k == vmClasses::Class_klass()) {
1120
    if (!java_lang_Class::is_primitive(obj)) {
1121
      k = java_lang_Class::as_Klass(obj);
1122
      assert(k != nullptr, "class for non-primitive mirror must exist");
1123
    }
1124
  }
1125
  return k;
1126
}
1127

1128
class JvmtiObjectAllocEventMark : public JvmtiClassEventMark  {
1129
 private:
1130
   jobject _jobj;
1131
   jlong    _size;
1132
 public:
1133
   JvmtiObjectAllocEventMark(JavaThread *thread, oop obj) : JvmtiClassEventMark(thread, oop_to_klass(obj)) {
1134
     _jobj = (jobject)to_jobject(obj);
1135
     _size = obj->size() * wordSize;
1136
   };
1137
   jobject jni_jobject() { return _jobj; }
1138
   jlong size() { return _size; }
1139
};
1140

1141
class JvmtiCompiledMethodLoadEventMark : public JvmtiMethodEventMark {
1142
 private:
1143
  jint _code_size;
1144
  const void *_code_data;
1145
  jint _map_length;
1146
  jvmtiAddrLocationMap *_map;
1147
  const void *_compile_info;
1148
 public:
1149
  JvmtiCompiledMethodLoadEventMark(JavaThread *thread, nmethod *nm, void* compile_info_ptr = nullptr)
1150
          : JvmtiMethodEventMark(thread,methodHandle(thread, nm->method())) {
1151
    _code_data = nm->code_begin();
1152
    _code_size = nm->code_size();
1153
    _compile_info = compile_info_ptr; // Set void pointer of compiledMethodLoad Event. Default value is null.
1154
    JvmtiCodeBlobEvents::build_jvmti_addr_location_map(nm, &_map, &_map_length);
1155
  }
1156
  ~JvmtiCompiledMethodLoadEventMark() {
1157
     FREE_C_HEAP_ARRAY(jvmtiAddrLocationMap, _map);
1158
  }
1159

1160
  jint code_size() { return _code_size; }
1161
  const void *code_data() { return _code_data; }
1162
  jint map_length() { return _map_length; }
1163
  const jvmtiAddrLocationMap* map() { return _map; }
1164
  const void *compile_info() { return _compile_info; }
1165
};
1166

1167

1168

1169
class JvmtiMonitorEventMark : public JvmtiVirtualThreadEventMark {
1170
private:
1171
  jobject _jobj;
1172
public:
1173
  JvmtiMonitorEventMark(JavaThread *thread, oop object)
1174
          : JvmtiVirtualThreadEventMark(thread){
1175
     _jobj = to_jobject(object);
1176
  }
1177
  jobject jni_object() { return _jobj; }
1178
};
1179

1180
///////////////////////////////////////////////////////////////
1181
//
1182
// pending CompiledMethodUnload support
1183
//
1184

1185
void JvmtiExport::post_compiled_method_unload(
1186
       jmethodID method, const void *code_begin) {
1187
  if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1188
    return;
1189
  }
1190
  JavaThread* thread = JavaThread::current();
1191
  EVT_TRIG_TRACE(JVMTI_EVENT_COMPILED_METHOD_UNLOAD,
1192
                 ("[%s] method compile unload event triggered",
1193
                  JvmtiTrace::safe_get_thread_name(thread)));
1194

1195
  // post the event for each environment that has this event enabled.
1196
  JvmtiEnvIterator it;
1197
  for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
1198
    if (env->is_enabled(JVMTI_EVENT_COMPILED_METHOD_UNLOAD)) {
1199
      if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1200
        continue;
1201
      }
1202
      EVT_TRACE(JVMTI_EVENT_COMPILED_METHOD_UNLOAD,
1203
                ("[%s] class compile method unload event sent jmethodID " PTR_FORMAT,
1204
                 JvmtiTrace::safe_get_thread_name(thread), p2i(method)));
1205

1206
      ResourceMark rm(thread);
1207

1208
      JvmtiEventMark jem(thread);
1209
      JvmtiJavaThreadEventTransition jet(thread);
1210
      jvmtiEventCompiledMethodUnload callback = env->callbacks()->CompiledMethodUnload;
1211
      if (callback != nullptr) {
1212
        (*callback)(env->jvmti_external(), method, code_begin);
1213
      }
1214
    }
1215
  }
1216
}
1217

1218
///////////////////////////////////////////////////////////////
1219
//
1220
// JvmtiExport
1221
//
1222

1223
void JvmtiExport::post_raw_breakpoint(JavaThread *thread, Method* method, address location) {
1224
  HandleMark hm(thread);
1225
  methodHandle mh(thread, method);
1226

1227
  JvmtiThreadState *state = get_jvmti_thread_state(thread);
1228
  if (state == nullptr) {
1229
    return;
1230
  }
1231
  if (thread->is_in_any_VTMS_transition()) {
1232
    return; // no events should be posted if thread is in any VTMS transition
1233
  }
1234

1235
  EVT_TRIG_TRACE(JVMTI_EVENT_BREAKPOINT, ("[%s] Trg Breakpoint triggered",
1236
                      JvmtiTrace::safe_get_thread_name(thread)));
1237
  JvmtiEnvThreadStateIterator it(state);
1238
  for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1239
    ets->compare_and_set_current_location(mh(), location, JVMTI_EVENT_BREAKPOINT);
1240
    if (!ets->breakpoint_posted() && ets->is_enabled(JVMTI_EVENT_BREAKPOINT)) {
1241
      ThreadState old_os_state = thread->osthread()->get_state();
1242
      thread->osthread()->set_state(BREAKPOINTED);
1243
      EVT_TRACE(JVMTI_EVENT_BREAKPOINT, ("[%s] Evt Breakpoint sent %s.%s @ " INTX_FORMAT,
1244
                     JvmtiTrace::safe_get_thread_name(thread),
1245
                     (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
1246
                     (mh() == nullptr) ? "null" : mh()->name()->as_C_string(),
1247
                     location - mh()->code_base() ));
1248

1249
      JvmtiEnv *env = ets->get_env();
1250
      JvmtiLocationEventMark jem(thread, mh, location);
1251
      JvmtiJavaThreadEventTransition jet(thread);
1252
      jvmtiEventBreakpoint callback = env->callbacks()->Breakpoint;
1253
      if (callback != nullptr) {
1254
        (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
1255
                    jem.jni_methodID(), jem.location());
1256
      }
1257

1258
      ets->set_breakpoint_posted();
1259
      thread->osthread()->set_state(old_os_state);
1260
    }
1261
  }
1262
}
1263

1264
//////////////////////////////////////////////////////////////////////////////
1265

1266
bool              JvmtiExport::_can_get_source_debug_extension            = false;
1267
bool              JvmtiExport::_can_maintain_original_method_order        = false;
1268
bool              JvmtiExport::_can_post_interpreter_events               = false;
1269
bool              JvmtiExport::_can_post_on_exceptions                    = false;
1270
bool              JvmtiExport::_can_post_breakpoint                       = false;
1271
bool              JvmtiExport::_can_post_field_access                     = false;
1272
bool              JvmtiExport::_can_post_field_modification               = false;
1273
bool              JvmtiExport::_can_post_method_entry                     = false;
1274
bool              JvmtiExport::_can_post_method_exit                      = false;
1275
bool              JvmtiExport::_can_post_frame_pop                        = false;
1276
bool              JvmtiExport::_can_pop_frame                             = false;
1277
bool              JvmtiExport::_can_force_early_return                    = false;
1278
bool              JvmtiExport::_can_support_virtual_threads               = false;
1279
bool              JvmtiExport::_can_get_owned_monitor_info                = false;
1280

1281
bool              JvmtiExport::_early_vmstart_recorded                    = false;
1282

1283
bool              JvmtiExport::_should_post_single_step                   = false;
1284
bool              JvmtiExport::_should_post_field_access                  = false;
1285
bool              JvmtiExport::_should_post_field_modification            = false;
1286
bool              JvmtiExport::_should_post_class_load                    = false;
1287
bool              JvmtiExport::_should_post_class_prepare                 = false;
1288
bool              JvmtiExport::_should_post_class_unload                  = false;
1289
bool              JvmtiExport::_should_post_thread_life                   = false;
1290
bool              JvmtiExport::_should_clean_up_heap_objects              = false;
1291
bool              JvmtiExport::_should_post_native_method_bind            = false;
1292
bool              JvmtiExport::_should_post_dynamic_code_generated        = false;
1293
bool              JvmtiExport::_should_post_data_dump                     = false;
1294
bool              JvmtiExport::_should_post_compiled_method_load          = false;
1295
bool              JvmtiExport::_should_post_compiled_method_unload        = false;
1296
bool              JvmtiExport::_should_post_monitor_contended_enter       = false;
1297
bool              JvmtiExport::_should_post_monitor_contended_entered     = false;
1298
bool              JvmtiExport::_should_post_monitor_wait                  = false;
1299
bool              JvmtiExport::_should_post_monitor_waited                = false;
1300
bool              JvmtiExport::_should_post_garbage_collection_start      = false;
1301
bool              JvmtiExport::_should_post_garbage_collection_finish     = false;
1302
bool              JvmtiExport::_should_post_object_free                   = false;
1303
bool              JvmtiExport::_should_post_resource_exhausted            = false;
1304
bool              JvmtiExport::_should_post_vm_object_alloc               = false;
1305
bool              JvmtiExport::_should_post_sampled_object_alloc          = false;
1306
bool              JvmtiExport::_should_post_on_exceptions                 = false;
1307
bool              JvmtiExport::_should_post_vthread_start                 = false;
1308
bool              JvmtiExport::_should_post_vthread_end                   = false;
1309
bool              JvmtiExport::_should_post_vthread_mount                 = false;
1310
bool              JvmtiExport::_should_post_vthread_unmount               = false;
1311

1312
////////////////////////////////////////////////////////////////////////////////////////////////
1313

1314

1315
//
1316
// JVMTI single step management
1317
//
1318
void JvmtiExport::at_single_stepping_point(JavaThread *thread, Method* method, address location) {
1319
  assert(JvmtiExport::should_post_single_step(), "must be single stepping");
1320

1321
  HandleMark hm(thread);
1322
  methodHandle mh(thread, method);
1323

1324
  // update information about current location and post a step event
1325
  JvmtiThreadState *state = get_jvmti_thread_state(thread);
1326
  if (state == nullptr) {
1327
    return;
1328
  }
1329
  EVT_TRIG_TRACE(JVMTI_EVENT_SINGLE_STEP, ("[%s] Trg Single Step triggered",
1330
                      JvmtiTrace::safe_get_thread_name(thread)));
1331
  if (!state->hide_single_stepping()) {
1332
    if (state->is_pending_step_for_popframe()) {
1333
      state->process_pending_step_for_popframe();
1334
    }
1335
    if (state->is_pending_step_for_earlyret()) {
1336
      state->process_pending_step_for_earlyret();
1337
    }
1338
    JvmtiExport::post_single_step(thread, mh(), location);
1339
  }
1340
}
1341

1342

1343
void JvmtiExport::expose_single_stepping(JavaThread *thread) {
1344
  JvmtiThreadState *state = get_jvmti_thread_state(thread);
1345
  if (state != nullptr) {
1346
    state->clear_hide_single_stepping();
1347
  }
1348
}
1349

1350

1351
bool JvmtiExport::hide_single_stepping(JavaThread *thread) {
1352
  JvmtiThreadState *state = get_jvmti_thread_state(thread);
1353
  if (state != nullptr && state->is_enabled(JVMTI_EVENT_SINGLE_STEP)) {
1354
    state->set_hide_single_stepping();
1355
    return true;
1356
  } else {
1357
    return false;
1358
  }
1359
}
1360

1361
void JvmtiExport::post_class_load(JavaThread *thread, Klass* klass) {
1362
  if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1363
    return;
1364
  }
1365
  HandleMark hm(thread);
1366

1367
  JvmtiThreadState *state = get_jvmti_thread_state(thread);
1368
  if (state == nullptr) {
1369
    return;
1370
  }
1371
  if (thread->is_in_any_VTMS_transition()) {
1372
    return; // no events should be posted if thread is in any VTMS transition
1373
  }
1374

1375
  EVT_TRIG_TRACE(JVMTI_EVENT_CLASS_LOAD, ("[%s] Trg Class Load triggered",
1376
                      JvmtiTrace::safe_get_thread_name(thread)));
1377
  JvmtiEnvThreadStateIterator it(state);
1378
  for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1379
    if (ets->is_enabled(JVMTI_EVENT_CLASS_LOAD)) {
1380
      JvmtiEnv *env = ets->get_env();
1381
      if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1382
        continue;
1383
      }
1384
      EVT_TRACE(JVMTI_EVENT_CLASS_LOAD, ("[%s] Evt Class Load sent %s",
1385
                                         JvmtiTrace::safe_get_thread_name(thread),
1386
                                         klass==nullptr? "null" : klass->external_name() ));
1387
      JvmtiClassEventMark jem(thread, klass);
1388
      JvmtiJavaThreadEventTransition jet(thread);
1389
      jvmtiEventClassLoad callback = env->callbacks()->ClassLoad;
1390
      if (callback != nullptr) {
1391
        (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_class());
1392
      }
1393
    }
1394
  }
1395
}
1396

1397

1398
void JvmtiExport::post_class_prepare(JavaThread *thread, Klass* klass) {
1399
  if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1400
    return;
1401
  }
1402
  HandleMark hm(thread);
1403

1404
  JvmtiThreadState *state = get_jvmti_thread_state(thread);
1405
  if (state == nullptr) {
1406
    return;
1407
  }
1408
  if (thread->is_in_any_VTMS_transition()) {
1409
    return; // no events should be posted if thread is in any VTMS transition
1410
  }
1411

1412
  EVT_TRIG_TRACE(JVMTI_EVENT_CLASS_PREPARE, ("[%s] Trg Class Prepare triggered",
1413
                      JvmtiTrace::safe_get_thread_name(thread)));
1414
  JvmtiEnvThreadStateIterator it(state);
1415
  for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1416
    if (ets->is_enabled(JVMTI_EVENT_CLASS_PREPARE)) {
1417
      JvmtiEnv *env = ets->get_env();
1418
      if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1419
        continue;
1420
      }
1421
      EVT_TRACE(JVMTI_EVENT_CLASS_PREPARE, ("[%s] Evt Class Prepare sent %s",
1422
                                            JvmtiTrace::safe_get_thread_name(thread),
1423
                                            klass==nullptr? "null" : klass->external_name() ));
1424
      JvmtiClassEventMark jem(thread, klass);
1425
      JvmtiJavaThreadEventTransition jet(thread);
1426
      jvmtiEventClassPrepare callback = env->callbacks()->ClassPrepare;
1427
      if (callback != nullptr) {
1428
        (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_class());
1429
      }
1430
    }
1431
  }
1432
}
1433

1434
void JvmtiExport::post_class_unload(Klass* klass) {
1435
  if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1436
    return;
1437
  }
1438

1439
  // postings to the service thread so that it can perform them in a safe
1440
  // context and in-order.
1441
  ResourceMark rm;
1442
  // JvmtiDeferredEvent copies the string.
1443
  JvmtiDeferredEvent event = JvmtiDeferredEvent::class_unload_event(klass->name()->as_C_string());
1444
  ServiceThread::enqueue_deferred_event(&event);
1445
}
1446

1447

1448
void JvmtiExport::post_class_unload_internal(const char* name) {
1449
  if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1450
    return;
1451
  }
1452
  assert(Thread::current()->is_service_thread(), "must be called from ServiceThread");
1453
  JavaThread *thread = JavaThread::current();
1454
  HandleMark hm(thread);
1455

1456
  EVT_TRIG_TRACE(EXT_EVENT_CLASS_UNLOAD, ("[?] Trg Class Unload triggered" ));
1457
  if (JvmtiEventController::is_enabled((jvmtiEvent)EXT_EVENT_CLASS_UNLOAD)) {
1458

1459
    JvmtiEnvIterator it;
1460
    for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
1461
      if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1462
        continue;
1463
      }
1464
      if (env->is_enabled((jvmtiEvent)EXT_EVENT_CLASS_UNLOAD)) {
1465
        EVT_TRACE(EXT_EVENT_CLASS_UNLOAD, ("[?] Evt Class Unload sent %s", name));
1466

1467
        JvmtiEventMark jem(thread);
1468
        JvmtiJavaThreadEventTransition jet(thread);
1469
        jvmtiExtensionEvent callback = env->ext_callbacks()->ClassUnload;
1470
        if (callback != nullptr) {
1471
          (*callback)(env->jvmti_external(), jem.jni_env(), name);
1472
        }
1473
      }
1474
    }
1475
  }
1476
}
1477

1478

1479
void JvmtiExport::post_thread_start(JavaThread *thread) {
1480
  if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1481
    return;
1482
  }
1483
  assert(thread->thread_state() == _thread_in_vm, "must be in vm state");
1484

1485
  EVT_TRIG_TRACE(JVMTI_EVENT_THREAD_START, ("[%s] Trg Thread Start event triggered",
1486
                      JvmtiTrace::safe_get_thread_name(thread)));
1487

1488
  // do JVMTI thread initialization (if needed)
1489
  JvmtiEventController::thread_started(thread);
1490

1491
  if (thread->threadObj()->is_a(vmClasses::BoundVirtualThread_klass())) {
1492
    if (JvmtiExport::can_support_virtual_threads()) {
1493
      // Check for VirtualThreadStart event instead.
1494
      HandleMark hm(thread);
1495
      Handle vthread(thread, thread->threadObj());
1496
      JvmtiExport::post_vthread_start((jthread)vthread.raw_value());
1497
    }
1498
    return;
1499
  }
1500

1501
  // Do not post thread start event for hidden java thread.
1502
  if (JvmtiEventController::is_enabled(JVMTI_EVENT_THREAD_START) &&
1503
      !thread->is_hidden_from_external_view()) {
1504
    JvmtiEnvIterator it;
1505
    for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
1506
      if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1507
        continue;
1508
      }
1509
      if (env->is_enabled(JVMTI_EVENT_THREAD_START)) {
1510
        EVT_TRACE(JVMTI_EVENT_THREAD_START, ("[%s] Evt Thread Start event sent",
1511
                     JvmtiTrace::safe_get_thread_name(thread) ));
1512

1513
        JvmtiVirtualThreadEventMark jem(thread);
1514
        JvmtiJavaThreadEventTransition jet(thread);
1515
        jvmtiEventThreadStart callback = env->callbacks()->ThreadStart;
1516
        if (callback != nullptr) {
1517
          (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread());
1518
        }
1519
      }
1520
    }
1521
  }
1522
}
1523

1524

1525
void JvmtiExport::post_thread_end(JavaThread *thread) {
1526
  if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1527
    return;
1528
  }
1529
  EVT_TRIG_TRACE(JVMTI_EVENT_THREAD_END, ("[%s] Trg Thread End event triggered",
1530
                      JvmtiTrace::safe_get_thread_name(thread)));
1531

1532
  JvmtiThreadState *state = get_jvmti_thread_state(thread);
1533
  if (state == nullptr) {
1534
    return;
1535
  }
1536

1537
  if (thread->threadObj()->is_a(vmClasses::BoundVirtualThread_klass())) {
1538
    if (JvmtiExport::can_support_virtual_threads()) {
1539
      // Check for VirtualThreadEnd event instead.
1540
      HandleMark hm(thread);
1541
      Handle vthread(thread, thread->threadObj());
1542
      JvmtiExport::post_vthread_end((jthread)vthread.raw_value());
1543
    }
1544
    return;
1545
  }
1546

1547
  // Do not post thread end event for hidden java thread.
1548
  if (state->is_enabled(JVMTI_EVENT_THREAD_END) &&
1549
      !thread->is_hidden_from_external_view()) {
1550

1551
    JvmtiEnvThreadStateIterator it(state);
1552
    for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1553
      JvmtiEnv *env = ets->get_env();
1554
      if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1555
        continue;
1556
      }
1557
      if (ets->is_enabled(JVMTI_EVENT_THREAD_END)) {
1558
        EVT_TRACE(JVMTI_EVENT_THREAD_END, ("[%s] Evt Thread End event sent",
1559
                     JvmtiTrace::safe_get_thread_name(thread) ));
1560

1561
        JvmtiVirtualThreadEventMark jem(thread);
1562
        JvmtiJavaThreadEventTransition jet(thread);
1563
        jvmtiEventThreadEnd callback = env->callbacks()->ThreadEnd;
1564
        if (callback != nullptr) {
1565
          (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread());
1566
        }
1567
      }
1568
    }
1569
  }
1570
}
1571

1572

1573
void JvmtiExport::post_vthread_start(jobject vthread) {
1574
  if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1575
    return;
1576
  }
1577
  EVT_TRIG_TRACE(JVMTI_EVENT_VIRTUAL_THREAD_START, ("[%p] Trg Virtual Thread Start event triggered", vthread));
1578

1579
  JavaThread *thread = JavaThread::current();
1580
  assert(!thread->is_hidden_from_external_view(), "carrier threads can't be hidden");
1581

1582
  if (JvmtiEventController::is_enabled(JVMTI_EVENT_VIRTUAL_THREAD_START)) {
1583
    JvmtiEnvIterator it;
1584
    for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
1585
      if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1586
        continue;
1587
      }
1588
      if (env->is_enabled(JVMTI_EVENT_VIRTUAL_THREAD_START)) {
1589
        EVT_TRACE(JVMTI_EVENT_VIRTUAL_THREAD_START, ("[%p] Evt Virtual Thread Start event sent", vthread));
1590

1591
        JvmtiVirtualThreadEventMark jem(thread);
1592
        JvmtiJavaThreadEventTransition jet(thread);
1593
        jvmtiEventVirtualThreadStart callback = env->callbacks()->VirtualThreadStart;
1594
        if (callback != nullptr) {
1595
          (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread());
1596
        }
1597
      }
1598
    }
1599
  }
1600
}
1601

1602
void JvmtiExport::post_vthread_end(jobject vthread) {
1603
  if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1604
    return;
1605
  }
1606
  EVT_TRIG_TRACE(JVMTI_EVENT_VIRTUAL_THREAD_END, ("[%p] Trg Virtual Thread End event triggered", vthread));
1607

1608
  JavaThread *thread = JavaThread::current();
1609
  assert(!thread->is_hidden_from_external_view(), "carrier threads can't be hidden");
1610

1611
  JvmtiThreadState *state = get_jvmti_thread_state(thread);
1612
  if (state == nullptr) {
1613
    return;
1614
  }
1615

1616
  if (state->is_enabled(JVMTI_EVENT_VIRTUAL_THREAD_END)) {
1617
    JvmtiEnvThreadStateIterator it(state);
1618

1619
    for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1620
      JvmtiEnv *env = ets->get_env();
1621
      if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1622
        continue;
1623
      }
1624
      if (ets->is_enabled(JVMTI_EVENT_VIRTUAL_THREAD_END)) {
1625
        EVT_TRACE(JVMTI_EVENT_VIRTUAL_THREAD_END, ("[%p] Evt Virtual Thread End event sent", vthread));
1626

1627
        JvmtiVirtualThreadEventMark jem(thread);
1628
        JvmtiJavaThreadEventTransition jet(thread);
1629
        jvmtiEventVirtualThreadEnd callback = env->callbacks()->VirtualThreadEnd;
1630
        if (callback != nullptr) {
1631
          (*callback)(env->jvmti_external(), jem.jni_env(), vthread);
1632
        }
1633
      }
1634
    }
1635
  }
1636
}
1637

1638
void JvmtiExport::post_vthread_mount(jobject vthread) {
1639
  if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1640
    return;
1641
  }
1642
  JavaThread *thread = JavaThread::current();
1643
  HandleMark hm(thread);
1644
  EVT_TRIG_TRACE(EXT_EVENT_VIRTUAL_THREAD_MOUNT, ("[%p] Trg Virtual Thread Mount event triggered", vthread));
1645

1646
  JvmtiThreadState *state = get_jvmti_thread_state(thread);
1647
  if (state == nullptr) {
1648
    return;
1649
  }
1650

1651
  if (state->is_enabled((jvmtiEvent)EXT_EVENT_VIRTUAL_THREAD_MOUNT)) {
1652
    JvmtiEnvThreadStateIterator it(state);
1653

1654
    for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1655
      JvmtiEnv *env = ets->get_env();
1656
      if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1657
        continue;
1658
      }
1659
      if (ets->is_enabled((jvmtiEvent)EXT_EVENT_VIRTUAL_THREAD_MOUNT)) {
1660
        EVT_TRACE(EXT_EVENT_VIRTUAL_THREAD_MOUNT, ("[%p] Evt Virtual Thread Mount event sent", vthread));
1661

1662
        JvmtiVirtualThreadEventMark jem(thread);
1663
        JvmtiJavaThreadEventTransition jet(thread);
1664
        jvmtiExtensionEvent callback = env->ext_callbacks()->VirtualThreadMount;
1665
        if (callback != nullptr) {
1666
          (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread());
1667
        }
1668
      }
1669
    }
1670
  }
1671
}
1672

1673
void JvmtiExport::post_vthread_unmount(jobject vthread) {
1674
  if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1675
    return;
1676
  }
1677
  JavaThread *thread = JavaThread::current();
1678
  HandleMark hm(thread);
1679
  EVT_TRIG_TRACE(EXT_EVENT_VIRTUAL_THREAD_UNMOUNT, ("[%p] Trg Virtual Thread Unmount event triggered", vthread));
1680

1681
  JvmtiThreadState *state = get_jvmti_thread_state(thread);
1682
  if (state == nullptr) {
1683
    return;
1684
  }
1685

1686
  if (state->is_enabled((jvmtiEvent)EXT_EVENT_VIRTUAL_THREAD_UNMOUNT)) {
1687
    JvmtiEnvThreadStateIterator it(state);
1688

1689
    for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1690
      JvmtiEnv *env = ets->get_env();
1691
      if (env->phase() == JVMTI_PHASE_PRIMORDIAL) {
1692
        continue;
1693
      }
1694
      if (ets->is_enabled((jvmtiEvent)EXT_EVENT_VIRTUAL_THREAD_UNMOUNT)) {
1695
        EVT_TRACE(EXT_EVENT_VIRTUAL_THREAD_UNMOUNT, ("[%p] Evt Virtual Thread Unmount event sent", vthread));
1696

1697
        JvmtiVirtualThreadEventMark jem(thread);
1698
        JvmtiJavaThreadEventTransition jet(thread);
1699
        jvmtiExtensionEvent callback = env->ext_callbacks()->VirtualThreadUnmount;
1700
        if (callback != nullptr) {
1701
          (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread());
1702
        }
1703
      }
1704
    }
1705
  }
1706
}
1707

1708
void JvmtiExport::continuation_yield_cleanup(JavaThread* thread, jint continuation_frame_count) {
1709
  if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
1710
    return;
1711
  }
1712

1713
  assert(thread == JavaThread::current(), "must be");
1714
  JvmtiThreadState *state = get_jvmti_thread_state(thread);
1715
  if (state == nullptr) {
1716
    return;
1717
  }
1718
  state->invalidate_cur_stack_depth();
1719

1720
  // Clear frame_pop requests in frames popped by yield
1721
  if (can_post_frame_pop()) {
1722
    JvmtiEnvThreadStateIterator it(state);
1723
    int top_frame_num = state->cur_stack_depth() + continuation_frame_count;
1724

1725
    for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1726
      if (!ets->has_frame_pops()) {
1727
        continue;
1728
      }
1729
      for (int frame_idx = 0; frame_idx < continuation_frame_count; frame_idx++) {
1730
        int frame_num = top_frame_num - frame_idx;
1731

1732
        if (!state->is_virtual() && ets->is_frame_pop(frame_num)) {
1733
          // remove the frame's entry
1734
          MutexLocker mu(JvmtiThreadState_lock);
1735
          ets->clear_frame_pop(frame_num);
1736
        }
1737
      }
1738
    }
1739
  }
1740
}
1741

1742
void JvmtiExport::post_object_free(JvmtiEnv* env, GrowableArray<jlong>* objects) {
1743
  assert(objects != nullptr, "Nothing to post");
1744

1745
  JavaThread *javaThread = JavaThread::current();
1746
  if (javaThread->is_in_any_VTMS_transition()) {
1747
    return; // no events should be posted if thread is in any VTMS transition
1748
  }
1749
  if (!env->is_enabled(JVMTI_EVENT_OBJECT_FREE)) {
1750
    return; // the event type has been already disabled
1751
  }
1752

1753
  EVT_TRIG_TRACE(JVMTI_EVENT_OBJECT_FREE, ("[?] Trg Object Free triggered" ));
1754
  EVT_TRACE(JVMTI_EVENT_OBJECT_FREE, ("[?] Evt Object Free sent"));
1755

1756
  JvmtiThreadEventMark jem(javaThread);
1757
  JvmtiJavaThreadEventTransition jet(javaThread);
1758
  jvmtiEventObjectFree callback = env->callbacks()->ObjectFree;
1759
  if (callback != nullptr) {
1760
    for (int index = 0; index < objects->length(); index++) {
1761
      (*callback)(env->jvmti_external(), objects->at(index));
1762
    }
1763
  }
1764
}
1765

1766
void JvmtiExport::post_resource_exhausted(jint resource_exhausted_flags, const char* description) {
1767

1768
  JavaThread *thread  = JavaThread::current();
1769

1770
  if (thread->is_in_any_VTMS_transition()) {
1771
    return; // no events should be posted if thread is in any VTMS transition
1772
  }
1773

1774
  log_error(jvmti)("Posting Resource Exhausted event: %s",
1775
                   description != nullptr ? description : "unknown");
1776

1777
  // JDK-8213834: handlers of ResourceExhausted may attempt some analysis
1778
  // which often requires running java.
1779
  // This will cause problems on threads not able to run java, e.g. compiler
1780
  // threads. To forestall these problems, we therefore suppress sending this
1781
  // event from threads which are not able to run java.
1782
  if (!thread->can_call_java()) {
1783
    return;
1784
  }
1785

1786
  EVT_TRIG_TRACE(JVMTI_EVENT_RESOURCE_EXHAUSTED, ("Trg resource exhausted event triggered" ));
1787

1788
  JvmtiEnvIterator it;
1789
  for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
1790
    if (env->is_enabled(JVMTI_EVENT_RESOURCE_EXHAUSTED)) {
1791
      EVT_TRACE(JVMTI_EVENT_RESOURCE_EXHAUSTED, ("Evt resource exhausted event sent" ));
1792

1793
      JvmtiThreadEventMark jem(thread);
1794
      JvmtiJavaThreadEventTransition jet(thread);
1795
      jvmtiEventResourceExhausted callback = env->callbacks()->ResourceExhausted;
1796
      if (callback != nullptr) {
1797
        (*callback)(env->jvmti_external(), jem.jni_env(),
1798
                    resource_exhausted_flags, nullptr, description);
1799
      }
1800
    }
1801
  }
1802
}
1803

1804
void JvmtiExport::post_method_entry(JavaThread *thread, Method* method, frame current_frame) {
1805
  HandleMark hm(thread);
1806
  methodHandle mh(thread, method);
1807

1808
  JvmtiThreadState *state = get_jvmti_thread_state(thread);
1809
  if (state == nullptr || !state->is_interp_only_mode()) {
1810
    // for any thread that actually wants method entry, interp_only_mode is set
1811
    return;
1812
  }
1813
  if (mh->jvmti_mount_transition() || thread->is_in_any_VTMS_transition()) {
1814
    return; // no events should be posted if thread is in any VTMS transition
1815
  }
1816
  EVT_TRIG_TRACE(JVMTI_EVENT_METHOD_ENTRY, ("[%s] Trg Method Entry triggered %s.%s",
1817
                     JvmtiTrace::safe_get_thread_name(thread),
1818
                     (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
1819
                     (mh() == nullptr) ? "null" : mh()->name()->as_C_string() ));
1820

1821
  state->incr_cur_stack_depth();
1822

1823
  if (state->is_enabled(JVMTI_EVENT_METHOD_ENTRY)) {
1824
    JvmtiEnvThreadStateIterator it(state);
1825
    for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1826
      if (ets->is_enabled(JVMTI_EVENT_METHOD_ENTRY)) {
1827
        EVT_TRACE(JVMTI_EVENT_METHOD_ENTRY, ("[%s] Evt Method Entry sent %s.%s",
1828
                                             JvmtiTrace::safe_get_thread_name(thread),
1829
                                             (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
1830
                                             (mh() == nullptr) ? "null" : mh()->name()->as_C_string() ));
1831

1832
        JvmtiEnv *env = ets->get_env();
1833
        JvmtiMethodEventMark jem(thread, mh);
1834
        JvmtiJavaThreadEventTransition jet(thread);
1835
        jvmtiEventMethodEntry callback = env->callbacks()->MethodEntry;
1836
        if (callback != nullptr) {
1837
          (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_methodID());
1838
        }
1839
      }
1840
    }
1841
  }
1842
}
1843

1844
void JvmtiExport::post_method_exit(JavaThread* thread, Method* method, frame current_frame) {
1845
  HandleMark hm(thread);
1846
  methodHandle mh(thread, method);
1847

1848
  JvmtiThreadState *state = get_jvmti_thread_state(thread);
1849

1850
  if (state == nullptr || !state->is_interp_only_mode()) {
1851
    // for any thread that actually wants method exit, interp_only_mode is set
1852
    return;
1853
  }
1854

1855
  // return a flag when a method terminates by throwing an exception
1856
  // i.e. if an exception is thrown and it's not caught by the current method
1857
  bool exception_exit = state->is_exception_detected() && !state->is_exception_caught();
1858
  Handle result;
1859
  jvalue value;
1860
  value.j = 0L;
1861

1862
  if (state->is_enabled(JVMTI_EVENT_METHOD_EXIT)) {
1863
    // if the method hasn't been popped because of an exception then we populate
1864
    // the return_value parameter for the callback. At this point we only have
1865
    // the address of a "raw result" and we just call into the interpreter to
1866
    // convert this into a jvalue.
1867
    if (!exception_exit) {
1868
      oop oop_result;
1869
      BasicType type = current_frame.interpreter_frame_result(&oop_result, &value);
1870
      if (is_reference_type(type)) {
1871
        result = Handle(thread, oop_result);
1872
        value.l = JNIHandles::make_local(thread, result());
1873
      }
1874
    }
1875
  }
1876

1877
  // Deferred transition to VM, so we can stash away the return oop before GC
1878
  // Note that this transition is not needed when throwing an exception, because
1879
  // there is no oop to retain.
1880
  JavaThread* current = thread; // for JRT_BLOCK
1881
  JRT_BLOCK
1882
    post_method_exit_inner(thread, mh, state, exception_exit, current_frame, value);
1883
  JRT_BLOCK_END
1884

1885
  if (result.not_null() && !mh->is_native()) {
1886
    // We have to restore the oop on the stack for interpreter frames
1887
    *(oop*)current_frame.interpreter_frame_tos_address() = result();
1888
  }
1889
}
1890

1891
void JvmtiExport::post_method_exit_inner(JavaThread* thread,
1892
                                         methodHandle& mh,
1893
                                         JvmtiThreadState *state,
1894
                                         bool exception_exit,
1895
                                         frame current_frame,
1896
                                         jvalue& value) {
1897
  if (mh->jvmti_mount_transition() || thread->is_in_any_VTMS_transition()) {
1898
    return; // no events should be posted if thread is in any VTMS transition
1899
  }
1900

1901
  EVT_TRIG_TRACE(JVMTI_EVENT_METHOD_EXIT, ("[%s] Trg Method Exit triggered %s.%s",
1902
                                           JvmtiTrace::safe_get_thread_name(thread),
1903
                                           (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
1904
                                           (mh() == nullptr) ? "null" : mh()->name()->as_C_string() ));
1905

1906
  if (state->is_enabled(JVMTI_EVENT_METHOD_EXIT)) {
1907
    JvmtiEnvThreadStateIterator it(state);
1908
    for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1909
      if (ets->is_enabled(JVMTI_EVENT_METHOD_EXIT)) {
1910
        EVT_TRACE(JVMTI_EVENT_METHOD_EXIT, ("[%s] Evt Method Exit sent %s.%s",
1911
                                            JvmtiTrace::safe_get_thread_name(thread),
1912
                                            (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
1913
                                            (mh() == nullptr) ? "null" : mh()->name()->as_C_string() ));
1914

1915
        JvmtiEnv *env = ets->get_env();
1916
        JvmtiMethodEventMark jem(thread, mh);
1917
        JvmtiJavaThreadEventTransition jet(thread);
1918
        jvmtiEventMethodExit callback = env->callbacks()->MethodExit;
1919
        if (callback != nullptr) {
1920
          (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
1921
                      jem.jni_methodID(), exception_exit,  value);
1922
        }
1923
      }
1924
    }
1925
  }
1926

1927
  JvmtiEnvThreadStateIterator it(state);
1928
  for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1929
    if (ets->has_frame_pops()) {
1930
      int cur_frame_number = state->cur_stack_depth();
1931

1932
      if (ets->is_frame_pop(cur_frame_number)) {
1933
        // we have a NotifyFramePop entry for this frame.
1934
        // now check that this env/thread wants this event
1935
        if (ets->is_enabled(JVMTI_EVENT_FRAME_POP)) {
1936
          EVT_TRACE(JVMTI_EVENT_FRAME_POP, ("[%s] Evt Frame Pop sent %s.%s",
1937
                                            JvmtiTrace::safe_get_thread_name(thread),
1938
                                            (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
1939
                                            (mh() == nullptr) ? "null" : mh()->name()->as_C_string() ));
1940

1941
          // we also need to issue a frame pop event for this frame
1942
          JvmtiEnv *env = ets->get_env();
1943
          JvmtiMethodEventMark jem(thread, mh);
1944
          JvmtiJavaThreadEventTransition jet(thread);
1945
          jvmtiEventFramePop callback = env->callbacks()->FramePop;
1946
          if (callback != nullptr) {
1947
            (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
1948
                        jem.jni_methodID(), exception_exit);
1949
          }
1950
        }
1951
        // remove the frame's entry
1952
        {
1953
          MutexLocker mu(JvmtiThreadState_lock);
1954
          ets->clear_frame_pop(cur_frame_number);
1955
        }
1956
      }
1957
    }
1958
  }
1959

1960
  state->decr_cur_stack_depth();
1961
}
1962

1963

1964
// Todo: inline this for optimization
1965
void JvmtiExport::post_single_step(JavaThread *thread, Method* method, address location) {
1966
  HandleMark hm(thread);
1967
  methodHandle mh(thread, method);
1968

1969
  JvmtiThreadState *state = get_jvmti_thread_state(thread);
1970
  if (state == nullptr) {
1971
    return;
1972
  }
1973
  if (mh->jvmti_mount_transition() || thread->is_in_any_VTMS_transition()) {
1974
    return; // no events should be posted if thread is in any VTMS transition
1975
  }
1976

1977
  JvmtiEnvThreadStateIterator it(state);
1978
  for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
1979
    ets->compare_and_set_current_location(mh(), location, JVMTI_EVENT_SINGLE_STEP);
1980
    if (!ets->single_stepping_posted() && ets->is_enabled(JVMTI_EVENT_SINGLE_STEP)) {
1981
      EVT_TRACE(JVMTI_EVENT_SINGLE_STEP, ("[%s] Evt Single Step sent %s.%s @ " INTX_FORMAT,
1982
                    JvmtiTrace::safe_get_thread_name(thread),
1983
                    (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
1984
                    (mh() == nullptr) ? "null" : mh()->name()->as_C_string(),
1985
                    location - mh()->code_base() ));
1986

1987
      JvmtiEnv *env = ets->get_env();
1988
      JvmtiLocationEventMark jem(thread, mh, location);
1989
      JvmtiJavaThreadEventTransition jet(thread);
1990
      jvmtiEventSingleStep callback = env->callbacks()->SingleStep;
1991
      if (callback != nullptr) {
1992
        (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
1993
                    jem.jni_methodID(), jem.location());
1994
      }
1995

1996
      ets->set_single_stepping_posted();
1997
    }
1998
  }
1999
}
2000

2001
void JvmtiExport::post_exception_throw(JavaThread *thread, Method* method, address location, oop exception) {
2002
  HandleMark hm(thread);
2003
  methodHandle mh(thread, method);
2004
  Handle exception_handle(thread, exception);
2005
  // The KeepStackGCProcessedMark below keeps the target thread and its stack fully
2006
  // GC processed across this scope. This is needed because there is a stack walk
2007
  // below with safepoint polls inside of it. After such safepoints, we have to
2008
  // ensure the stack is sufficiently processed.
2009
  KeepStackGCProcessedMark ksgcpm(thread);
2010

2011
  JvmtiThreadState *state = get_jvmti_thread_state(thread);
2012
  if (state == nullptr) {
2013
    return;
2014
  }
2015
  if (thread->is_in_any_VTMS_transition()) {
2016
    return; // no events should be posted if thread is in any VTMS transition
2017
  }
2018

2019
  EVT_TRIG_TRACE(JVMTI_EVENT_EXCEPTION, ("[%s] Trg Exception thrown triggered",
2020
                      JvmtiTrace::safe_get_thread_name(thread)));
2021
  if (!state->is_exception_detected()) {
2022
    state->set_exception_detected();
2023
    JvmtiEnvThreadStateIterator it(state);
2024
    for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
2025
      if (ets->is_enabled(JVMTI_EVENT_EXCEPTION) && (exception != nullptr)) {
2026

2027
        EVT_TRACE(JVMTI_EVENT_EXCEPTION,
2028
                     ("[%s] Evt Exception thrown sent %s.%s @ " INTX_FORMAT,
2029
                      JvmtiTrace::safe_get_thread_name(thread),
2030
                      (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
2031
                      (mh() == nullptr) ? "null" : mh()->name()->as_C_string(),
2032
                      location - mh()->code_base() ));
2033

2034
        JvmtiEnv *env = ets->get_env();
2035
        JvmtiExceptionEventMark jem(thread, mh, location, exception_handle);
2036

2037
        // It's okay to clear these exceptions here because we duplicate
2038
        // this lookup in InterpreterRuntime::exception_handler_for_exception.
2039
        EXCEPTION_MARK;
2040

2041
        bool should_repeat;
2042
        vframeStream st(thread);
2043
        assert(!st.at_end(), "cannot be at end");
2044
        Method* current_method = nullptr;
2045
        // A GC may occur during the Method::fast_exception_handler_bci_for()
2046
        // call below if it needs to load the constraint class. Using a
2047
        // methodHandle to keep the 'current_method' from being deallocated
2048
        // if GC happens.
2049
        methodHandle current_mh = methodHandle(thread, current_method);
2050
        int current_bci = -1;
2051
        do {
2052
          current_method = st.method();
2053
          current_mh = methodHandle(thread, current_method);
2054
          current_bci = st.bci();
2055
          do {
2056
            should_repeat = false;
2057
            Klass* eh_klass = exception_handle()->klass();
2058
            current_bci = Method::fast_exception_handler_bci_for(
2059
              current_mh, eh_klass, current_bci, THREAD);
2060
            if (HAS_PENDING_EXCEPTION) {
2061
              exception_handle = Handle(thread, PENDING_EXCEPTION);
2062
              CLEAR_PENDING_EXCEPTION;
2063
              should_repeat = true;
2064
            }
2065
          } while (should_repeat && (current_bci != -1));
2066
          st.next();
2067
        } while ((current_bci < 0) && (!st.at_end()));
2068

2069
        jmethodID catch_jmethodID;
2070
        if (current_bci < 0) {
2071
          catch_jmethodID = 0;
2072
          current_bci = 0;
2073
        } else {
2074
          catch_jmethodID = jem.to_jmethodID(current_mh);
2075
        }
2076

2077
        JvmtiJavaThreadEventTransition jet(thread);
2078
        jvmtiEventException callback = env->callbacks()->Exception;
2079
        if (callback != nullptr) {
2080
          (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2081
                      jem.jni_methodID(), jem.location(),
2082
                      jem.exception(),
2083
                      catch_jmethodID, current_bci);
2084
        }
2085
      }
2086
    }
2087
  }
2088

2089
  // frames may get popped because of this throw, be safe - invalidate cached depth
2090
  state->invalidate_cur_stack_depth();
2091
}
2092

2093

2094
void JvmtiExport::notice_unwind_due_to_exception(JavaThread *thread, Method* method, address location, oop exception, bool in_handler_frame) {
2095
  HandleMark hm(thread);
2096
  methodHandle mh(thread, method);
2097
  Handle exception_handle(thread, exception);
2098

2099
  JvmtiThreadState *state = get_jvmti_thread_state(thread);
2100
  if (state == nullptr) {
2101
    return;
2102
  }
2103
  EVT_TRIG_TRACE(JVMTI_EVENT_EXCEPTION_CATCH,
2104
                    ("[%s] Trg unwind_due_to_exception triggered %s.%s @ %s" INTX_FORMAT " - %s",
2105
                     JvmtiTrace::safe_get_thread_name(thread),
2106
                     (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
2107
                     (mh() == nullptr) ? "null" : mh()->name()->as_C_string(),
2108
                     location==0? "no location:" : "",
2109
                     location==0? 0 : location - mh()->code_base(),
2110
                     in_handler_frame? "in handler frame" : "not handler frame" ));
2111

2112
  if (state->is_exception_detected()) {
2113

2114
    state->invalidate_cur_stack_depth();
2115
    if (!in_handler_frame) {
2116
      // Not in exception handler.
2117
      if(state->is_interp_only_mode()) {
2118
        // method exit and frame pop events are posted only in interp mode.
2119
        // When these events are enabled code should be in running in interp mode.
2120
        jvalue no_value;
2121
        no_value.j = 0L;
2122
        JvmtiExport::post_method_exit_inner(thread, mh, state, true, thread->last_frame(), no_value);
2123
        // The cached cur_stack_depth might have changed from the
2124
        // operations of frame pop or method exit. We are not 100% sure
2125
        // the cached cur_stack_depth is still valid depth so invalidate
2126
        // it.
2127
        state->invalidate_cur_stack_depth();
2128
      }
2129
    } else {
2130
      // In exception handler frame. Report exception catch.
2131
      assert(location != nullptr, "must be a known location");
2132
      // Update cur_stack_depth - the frames above the current frame
2133
      // have been unwound due to this exception:
2134
      assert(!state->is_exception_caught(), "exception must not be caught yet.");
2135
      state->set_exception_caught();
2136

2137
      if (mh->jvmti_mount_transition() || thread->is_in_any_VTMS_transition()) {
2138
        return; // no events should be posted if thread is in any VTMS transition
2139
      }
2140
      JvmtiEnvThreadStateIterator it(state);
2141
      for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
2142
        if (ets->is_enabled(JVMTI_EVENT_EXCEPTION_CATCH) && (exception_handle() != nullptr)) {
2143
          EVT_TRACE(JVMTI_EVENT_EXCEPTION_CATCH,
2144
                     ("[%s] Evt ExceptionCatch sent %s.%s @ " INTX_FORMAT,
2145
                      JvmtiTrace::safe_get_thread_name(thread),
2146
                      (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
2147
                      (mh() == nullptr) ? "null" : mh()->name()->as_C_string(),
2148
                      location - mh()->code_base() ));
2149

2150
          JvmtiEnv *env = ets->get_env();
2151
          JvmtiExceptionEventMark jem(thread, mh, location, exception_handle);
2152
          JvmtiJavaThreadEventTransition jet(thread);
2153
          jvmtiEventExceptionCatch callback = env->callbacks()->ExceptionCatch;
2154
          if (callback != nullptr) {
2155
            (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2156
                      jem.jni_methodID(), jem.location(),
2157
                      jem.exception());
2158
          }
2159
        }
2160
      }
2161
    }
2162
  }
2163
}
2164

2165
oop JvmtiExport::jni_GetField_probe(JavaThread *thread, jobject jobj, oop obj,
2166
                                    Klass* klass, jfieldID fieldID, bool is_static) {
2167
  if (*((int *)get_field_access_count_addr()) > 0 && thread->has_last_Java_frame()) {
2168
    // At least one field access watch is set so we have more work to do.
2169
    post_field_access_by_jni(thread, obj, klass, fieldID, is_static);
2170
    // event posting can block so refetch oop if we were passed a jobj
2171
    if (jobj != nullptr) return JNIHandles::resolve_non_null(jobj);
2172
  }
2173
  return obj;
2174
}
2175

2176
void JvmtiExport::post_field_access_by_jni(JavaThread *thread, oop obj,
2177
                                           Klass* klass, jfieldID fieldID, bool is_static) {
2178
  // We must be called with a Java context in order to provide reasonable
2179
  // values for the klazz, method, and location fields. The callers of this
2180
  // function don't make the call unless there is a Java context.
2181
  assert(thread->has_last_Java_frame(), "must be called with a Java context");
2182

2183
  if (thread->is_in_any_VTMS_transition()) {
2184
    return; // no events should be posted if thread is in any VTMS transition
2185
  }
2186

2187
  ResourceMark rm;
2188
  fieldDescriptor fd;
2189
  // if get_field_descriptor finds fieldID to be invalid, then we just bail
2190
  bool valid_fieldID = JvmtiEnv::get_field_descriptor(klass, fieldID, &fd);
2191
  assert(valid_fieldID == true,"post_field_access_by_jni called with invalid fieldID");
2192
  if (!valid_fieldID) return;
2193
  // field accesses are not watched so bail
2194
  if (!fd.is_field_access_watched()) return;
2195

2196
  HandleMark hm(thread);
2197
  Handle h_obj;
2198
  if (!is_static) {
2199
    // non-static field accessors have an object, but we need a handle
2200
    assert(obj != nullptr, "non-static needs an object");
2201
    h_obj = Handle(thread, obj);
2202
  }
2203
  post_field_access(thread,
2204
                    thread->last_frame().interpreter_frame_method(),
2205
                    thread->last_frame().interpreter_frame_bcp(),
2206
                    klass, h_obj, fieldID);
2207
}
2208

2209
void JvmtiExport::post_field_access(JavaThread *thread, Method* method,
2210
  address location, Klass* field_klass, Handle object, jfieldID field) {
2211

2212
  HandleMark hm(thread);
2213
  methodHandle mh(thread, method);
2214

2215
  JvmtiThreadState *state = get_jvmti_thread_state(thread);
2216
  if (state == nullptr) {
2217
    return;
2218
  }
2219
  if (thread->is_in_any_VTMS_transition()) {
2220
    return; // no events should be posted if thread is in any VTMS transition
2221
  }
2222

2223
  EVT_TRIG_TRACE(JVMTI_EVENT_FIELD_ACCESS, ("[%s] Trg Field Access event triggered",
2224
                      JvmtiTrace::safe_get_thread_name(thread)));
2225
  JvmtiEnvThreadStateIterator it(state);
2226
  for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
2227
    if (ets->is_enabled(JVMTI_EVENT_FIELD_ACCESS)) {
2228
      EVT_TRACE(JVMTI_EVENT_FIELD_ACCESS, ("[%s] Evt Field Access event sent %s.%s @ " INTX_FORMAT,
2229
                     JvmtiTrace::safe_get_thread_name(thread),
2230
                     (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
2231
                     (mh() == nullptr) ? "null" : mh()->name()->as_C_string(),
2232
                     location - mh()->code_base() ));
2233

2234
      JvmtiEnv *env = ets->get_env();
2235
      JvmtiLocationEventMark jem(thread, mh, location);
2236
      jclass field_jclass = jem.to_jclass(field_klass);
2237
      jobject field_jobject = jem.to_jobject(object());
2238
      JvmtiJavaThreadEventTransition jet(thread);
2239
      jvmtiEventFieldAccess callback = env->callbacks()->FieldAccess;
2240
      if (callback != nullptr) {
2241
        (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2242
                    jem.jni_methodID(), jem.location(),
2243
                    field_jclass, field_jobject, field);
2244
      }
2245
    }
2246
  }
2247
}
2248

2249
oop JvmtiExport::jni_SetField_probe(JavaThread *thread, jobject jobj, oop obj,
2250
                                    Klass* klass, jfieldID fieldID, bool is_static,
2251
                                    char sig_type, jvalue *value) {
2252
  if (*((int *)get_field_modification_count_addr()) > 0 && thread->has_last_Java_frame()) {
2253
    // At least one field modification watch is set so we have more work to do.
2254
    post_field_modification_by_jni(thread, obj, klass, fieldID, is_static, sig_type, value);
2255
    // event posting can block so refetch oop if we were passed a jobj
2256
    if (jobj != nullptr) return JNIHandles::resolve_non_null(jobj);
2257
  }
2258
  return obj;
2259
}
2260

2261
void JvmtiExport::post_field_modification_by_jni(JavaThread *thread, oop obj,
2262
                                                 Klass* klass, jfieldID fieldID, bool is_static,
2263
                                                 char sig_type, jvalue *value) {
2264
  // We must be called with a Java context in order to provide reasonable
2265
  // values for the klazz, method, and location fields. The callers of this
2266
  // function don't make the call unless there is a Java context.
2267
  assert(thread->has_last_Java_frame(), "must be called with Java context");
2268

2269
  if (thread->is_in_any_VTMS_transition()) {
2270
    return; // no events should be posted if thread is in any VTMS transition
2271
  }
2272

2273
  ResourceMark rm;
2274
  fieldDescriptor fd;
2275
  // if get_field_descriptor finds fieldID to be invalid, then we just bail
2276
  bool valid_fieldID = JvmtiEnv::get_field_descriptor(klass, fieldID, &fd);
2277
  assert(valid_fieldID == true,"post_field_modification_by_jni called with invalid fieldID");
2278
  if (!valid_fieldID) return;
2279
  // field modifications are not watched so bail
2280
  if (!fd.is_field_modification_watched()) return;
2281

2282
  HandleMark hm(thread);
2283

2284
  Handle h_obj;
2285
  if (!is_static) {
2286
    // non-static field accessors have an object, but we need a handle
2287
    assert(obj != nullptr, "non-static needs an object");
2288
    h_obj = Handle(thread, obj);
2289
  }
2290
  post_field_modification(thread,
2291
                          thread->last_frame().interpreter_frame_method(),
2292
                          thread->last_frame().interpreter_frame_bcp(),
2293
                          klass, h_obj, fieldID, sig_type, value);
2294
}
2295

2296
void JvmtiExport::post_raw_field_modification(JavaThread *thread, Method* method,
2297
  address location, Klass* field_klass, Handle object, jfieldID field,
2298
  char sig_type, jvalue *value) {
2299

2300
  if (thread->is_in_any_VTMS_transition()) {
2301
    return; // no events should be posted if thread is in any VTMS transition
2302
  }
2303

2304
  if (sig_type == JVM_SIGNATURE_INT || sig_type == JVM_SIGNATURE_BOOLEAN ||
2305
      sig_type == JVM_SIGNATURE_BYTE || sig_type == JVM_SIGNATURE_CHAR ||
2306
      sig_type == JVM_SIGNATURE_SHORT) {
2307
    // 'I' instructions are used for byte, char, short and int.
2308
    // determine which it really is, and convert
2309
    fieldDescriptor fd;
2310
    bool found = JvmtiEnv::get_field_descriptor(field_klass, field, &fd);
2311
    // should be found (if not, leave as is)
2312
    if (found) {
2313
      jint ival = value->i;
2314
      // convert value from int to appropriate type
2315
      switch (fd.field_type()) {
2316
      case T_BOOLEAN:
2317
        sig_type = JVM_SIGNATURE_BOOLEAN;
2318
        value->i = 0; // clear it
2319
        value->z = (jboolean)ival;
2320
        break;
2321
      case T_BYTE:
2322
        sig_type = JVM_SIGNATURE_BYTE;
2323
        value->i = 0; // clear it
2324
        value->b = (jbyte)ival;
2325
        break;
2326
      case T_CHAR:
2327
        sig_type = JVM_SIGNATURE_CHAR;
2328
        value->i = 0; // clear it
2329
        value->c = (jchar)ival;
2330
        break;
2331
      case T_SHORT:
2332
        sig_type = JVM_SIGNATURE_SHORT;
2333
        value->i = 0; // clear it
2334
        value->s = (jshort)ival;
2335
        break;
2336
      case T_INT:
2337
        // nothing to do
2338
        break;
2339
      default:
2340
        // this is an integer instruction, should be one of above
2341
        ShouldNotReachHere();
2342
        break;
2343
      }
2344
    }
2345
  }
2346

2347
  assert(sig_type != JVM_SIGNATURE_ARRAY, "array should have sig_type == 'L'");
2348
  bool handle_created = false;
2349

2350
  // convert oop to JNI handle.
2351
  if (sig_type == JVM_SIGNATURE_CLASS) {
2352
    handle_created = true;
2353
    value->l = (jobject)JNIHandles::make_local(thread, cast_to_oop(value->l));
2354
  }
2355

2356
  post_field_modification(thread, method, location, field_klass, object, field, sig_type, value);
2357

2358
  // Destroy the JNI handle allocated above.
2359
  if (handle_created) {
2360
    JNIHandles::destroy_local(value->l);
2361
  }
2362
}
2363

2364
void JvmtiExport::post_field_modification(JavaThread *thread, Method* method,
2365
  address location, Klass* field_klass, Handle object, jfieldID field,
2366
  char sig_type, jvalue *value_ptr) {
2367

2368
  HandleMark hm(thread);
2369
  methodHandle mh(thread, method);
2370

2371
  JvmtiThreadState *state = get_jvmti_thread_state(thread);
2372
  if (state == nullptr) {
2373
    return;
2374
  }
2375
  if (thread->is_in_any_VTMS_transition()) {
2376
    return; // no events should be posted if thread is in any VTMS transition
2377
  }
2378

2379
  EVT_TRIG_TRACE(JVMTI_EVENT_FIELD_MODIFICATION,
2380
                     ("[%s] Trg Field Modification event triggered",
2381
                      JvmtiTrace::safe_get_thread_name(thread)));
2382
  JvmtiEnvThreadStateIterator it(state);
2383
  for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
2384
    if (ets->is_enabled(JVMTI_EVENT_FIELD_MODIFICATION)) {
2385
      EVT_TRACE(JVMTI_EVENT_FIELD_MODIFICATION,
2386
                   ("[%s] Evt Field Modification event sent %s.%s @ " INTX_FORMAT,
2387
                    JvmtiTrace::safe_get_thread_name(thread),
2388
                    (mh() == nullptr) ? "null" : mh()->klass_name()->as_C_string(),
2389
                    (mh() == nullptr) ? "null" : mh()->name()->as_C_string(),
2390
                    location - mh()->code_base() ));
2391

2392
      JvmtiEnv *env = ets->get_env();
2393
      JvmtiLocationEventMark jem(thread, mh, location);
2394
      jclass field_jclass = jem.to_jclass(field_klass);
2395
      jobject field_jobject = jem.to_jobject(object());
2396
      JvmtiJavaThreadEventTransition jet(thread);
2397
      jvmtiEventFieldModification callback = env->callbacks()->FieldModification;
2398
      if (callback != nullptr) {
2399
        (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2400
                    jem.jni_methodID(), jem.location(),
2401
                    field_jclass, field_jobject, field, sig_type, *value_ptr);
2402
      }
2403
    }
2404
  }
2405
}
2406

2407
void JvmtiExport::post_native_method_bind(Method* method, address* function_ptr) {
2408
  JavaThread* thread = JavaThread::current();
2409
  assert(thread->thread_state() == _thread_in_vm, "must be in vm state");
2410

2411
  HandleMark hm(thread);
2412
  methodHandle mh(thread, method);
2413

2414
  if (thread->is_in_any_VTMS_transition()) {
2415
    return; // no events should be posted if thread is in any VTMS transition
2416
  }
2417
  EVT_TRIG_TRACE(JVMTI_EVENT_NATIVE_METHOD_BIND, ("[%s] Trg Native Method Bind event triggered",
2418
                      JvmtiTrace::safe_get_thread_name(thread)));
2419

2420
  if (JvmtiEventController::is_enabled(JVMTI_EVENT_NATIVE_METHOD_BIND)) {
2421
    JvmtiEnvIterator it;
2422
    for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
2423
      if (env->is_enabled(JVMTI_EVENT_NATIVE_METHOD_BIND)) {
2424
        EVT_TRACE(JVMTI_EVENT_NATIVE_METHOD_BIND, ("[%s] Evt Native Method Bind event sent",
2425
                     JvmtiTrace::safe_get_thread_name(thread) ));
2426

2427
        JvmtiMethodEventMark jem(thread, mh);
2428
        JvmtiJavaThreadEventTransition jet(thread);
2429
        JNIEnv* jni_env = (env->phase() == JVMTI_PHASE_PRIMORDIAL) ? nullptr : jem.jni_env();
2430
        jvmtiEventNativeMethodBind callback = env->callbacks()->NativeMethodBind;
2431
        if (callback != nullptr) {
2432
          (*callback)(env->jvmti_external(), jni_env, jem.jni_thread(),
2433
                      jem.jni_methodID(), (void*)(*function_ptr), (void**)function_ptr);
2434
        }
2435
      }
2436
    }
2437
  }
2438
}
2439

2440
// Returns a record containing inlining information for the given nmethod
2441
static jvmtiCompiledMethodLoadInlineRecord* create_inline_record(nmethod* nm) {
2442
  jint numstackframes = 0;
2443
  jvmtiCompiledMethodLoadInlineRecord* record = (jvmtiCompiledMethodLoadInlineRecord*)NEW_RESOURCE_OBJ(jvmtiCompiledMethodLoadInlineRecord);
2444
  record->header.kind = JVMTI_CMLR_INLINE_INFO;
2445
  record->header.next = nullptr;
2446
  record->header.majorinfoversion = JVMTI_CMLR_MAJOR_VERSION_1;
2447
  record->header.minorinfoversion = JVMTI_CMLR_MINOR_VERSION_0;
2448
  record->numpcs = 0;
2449
  for(PcDesc* p = nm->scopes_pcs_begin(); p < nm->scopes_pcs_end(); p++) {
2450
   if(p->scope_decode_offset() == DebugInformationRecorder::serialized_null) continue;
2451
   record->numpcs++;
2452
  }
2453
  record->pcinfo = (PCStackInfo*)(NEW_RESOURCE_ARRAY(PCStackInfo, record->numpcs));
2454
  int scope = 0;
2455
  for(PcDesc* p = nm->scopes_pcs_begin(); p < nm->scopes_pcs_end(); p++) {
2456
    if(p->scope_decode_offset() == DebugInformationRecorder::serialized_null) continue;
2457
    void* pc_address = (void*)p->real_pc(nm);
2458
    assert(pc_address != nullptr, "pc_address must be non-null");
2459
    record->pcinfo[scope].pc = pc_address;
2460
    numstackframes=0;
2461
    for(ScopeDesc* sd = nm->scope_desc_at(p->real_pc(nm));sd != nullptr;sd = sd->sender()) {
2462
      numstackframes++;
2463
    }
2464
    assert(numstackframes != 0, "numstackframes must be nonzero.");
2465
    record->pcinfo[scope].methods = (jmethodID *)NEW_RESOURCE_ARRAY(jmethodID, numstackframes);
2466
    record->pcinfo[scope].bcis = (jint *)NEW_RESOURCE_ARRAY(jint, numstackframes);
2467
    record->pcinfo[scope].numstackframes = numstackframes;
2468
    int stackframe = 0;
2469
    for(ScopeDesc* sd = nm->scope_desc_at(p->real_pc(nm));sd != nullptr;sd = sd->sender()) {
2470
      // sd->method() can be null for stubs but not for nmethods. To be completely robust, include an assert that we should never see a null sd->method()
2471
      guarantee(sd->method() != nullptr, "sd->method() cannot be null.");
2472
      record->pcinfo[scope].methods[stackframe] = sd->method()->jmethod_id();
2473
      record->pcinfo[scope].bcis[stackframe] = sd->bci();
2474
      stackframe++;
2475
    }
2476
    scope++;
2477
  }
2478
  return record;
2479
}
2480

2481
void JvmtiExport::post_compiled_method_load(nmethod *nm) {
2482
  guarantee(!nm->is_unloading(), "nmethod isn't unloaded or unloading");
2483
  if (JvmtiEnv::get_phase() < JVMTI_PHASE_PRIMORDIAL) {
2484
    return;
2485
  }
2486
  JavaThread* thread = JavaThread::current();
2487

2488
  assert(!thread->is_in_any_VTMS_transition(), "compiled method load events are not allowed in any VTMS transition");
2489

2490
  EVT_TRIG_TRACE(JVMTI_EVENT_COMPILED_METHOD_LOAD,
2491
                 ("[%s] method compile load event triggered",
2492
                 JvmtiTrace::safe_get_thread_name(thread)));
2493

2494
  JvmtiEnvIterator it;
2495
  for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
2496
    post_compiled_method_load(env, nm);
2497
  }
2498
}
2499

2500
// post a COMPILED_METHOD_LOAD event for a given environment
2501
void JvmtiExport::post_compiled_method_load(JvmtiEnv* env, nmethod *nm) {
2502
  if (env->phase() == JVMTI_PHASE_PRIMORDIAL || !env->is_enabled(JVMTI_EVENT_COMPILED_METHOD_LOAD)) {
2503
    return;
2504
  }
2505
  jvmtiEventCompiledMethodLoad callback = env->callbacks()->CompiledMethodLoad;
2506
  if (callback == nullptr) {
2507
    return;
2508
  }
2509
  JavaThread* thread = JavaThread::current();
2510

2511
  assert(!thread->is_in_any_VTMS_transition(), "compiled method load events are not allowed in any VTMS transition");
2512

2513
  EVT_TRACE(JVMTI_EVENT_COMPILED_METHOD_LOAD,
2514
           ("[%s] method compile load event sent %s.%s  ",
2515
            JvmtiTrace::safe_get_thread_name(thread),
2516
            (nm->method() == nullptr) ? "null" : nm->method()->klass_name()->as_C_string(),
2517
            (nm->method() == nullptr) ? "null" : nm->method()->name()->as_C_string()));
2518
  ResourceMark rm(thread);
2519
  HandleMark hm(thread);
2520

2521
  // Add inlining information
2522
  jvmtiCompiledMethodLoadInlineRecord* inlinerecord = create_inline_record(nm);
2523
  // Pass inlining information through the void pointer
2524
  JvmtiCompiledMethodLoadEventMark jem(thread, nm, inlinerecord);
2525
  JvmtiJavaThreadEventTransition jet(thread);
2526
  (*callback)(env->jvmti_external(), jem.jni_methodID(),
2527
              jem.code_size(), jem.code_data(), jem.map_length(),
2528
              jem.map(), jem.compile_info());
2529
}
2530

2531
void JvmtiExport::post_dynamic_code_generated_internal(const char *name, const void *code_begin, const void *code_end) {
2532
  assert(name != nullptr && name[0] != '\0', "sanity check");
2533

2534
  JavaThread* thread = JavaThread::current();
2535

2536
  assert(!thread->is_in_any_VTMS_transition(), "dynamic code generated events are not allowed in any VTMS transition");
2537

2538
  // In theory everyone coming thru here is in_vm but we need to be certain
2539
  // because a callee will do a vm->native transition
2540
  ThreadInVMfromUnknown __tiv;
2541

2542
  EVT_TRIG_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED,
2543
                 ("[%s] method dynamic code generated event triggered",
2544
                 JvmtiTrace::safe_get_thread_name(thread)));
2545
  JvmtiEnvIterator it;
2546
  for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
2547
    if (env->is_enabled(JVMTI_EVENT_DYNAMIC_CODE_GENERATED)) {
2548
      EVT_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED,
2549
                ("[%s] dynamic code generated event sent for %s",
2550
                JvmtiTrace::safe_get_thread_name(thread), name));
2551
      JvmtiEventMark jem(thread);
2552
      JvmtiJavaThreadEventTransition jet(thread);
2553
      jint length = (jint)pointer_delta(code_end, code_begin, sizeof(char));
2554
      jvmtiEventDynamicCodeGenerated callback = env->callbacks()->DynamicCodeGenerated;
2555
      if (callback != nullptr) {
2556
        (*callback)(env->jvmti_external(), name, (void*)code_begin, length);
2557
      }
2558
    }
2559
  }
2560
}
2561

2562
void JvmtiExport::post_dynamic_code_generated(const char *name, const void *code_begin, const void *code_end) {
2563
  jvmtiPhase phase = JvmtiEnv::get_phase();
2564
  if (phase == JVMTI_PHASE_PRIMORDIAL || phase == JVMTI_PHASE_START) {
2565
    post_dynamic_code_generated_internal(name, code_begin, code_end);
2566
  } else {
2567
    // It may not be safe to post the event from this thread.  Defer all
2568
    // postings to the service thread so that it can perform them in a safe
2569
    // context and in-order.
2570
    JvmtiDeferredEvent event = JvmtiDeferredEvent::dynamic_code_generated_event(
2571
        name, code_begin, code_end);
2572
    ServiceThread::enqueue_deferred_event(&event);
2573
  }
2574
}
2575

2576

2577
// post a DYNAMIC_CODE_GENERATED event for a given environment
2578
// used by GenerateEvents
2579
void JvmtiExport::post_dynamic_code_generated(JvmtiEnv* env, const char *name,
2580
                                              const void *code_begin, const void *code_end)
2581
{
2582
  JavaThread* thread = JavaThread::current();
2583

2584
  assert(!thread->is_in_any_VTMS_transition(), "dynamic code generated events are not allowed in any VTMS transition");
2585

2586
  EVT_TRIG_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED,
2587
                 ("[%s] dynamic code generated event triggered (by GenerateEvents)",
2588
                  JvmtiTrace::safe_get_thread_name(thread)));
2589
  if (env->is_enabled(JVMTI_EVENT_DYNAMIC_CODE_GENERATED)) {
2590
    EVT_TRACE(JVMTI_EVENT_DYNAMIC_CODE_GENERATED,
2591
              ("[%s] dynamic code generated event sent for %s",
2592
               JvmtiTrace::safe_get_thread_name(thread), name));
2593
    JvmtiEventMark jem(thread);
2594
    JvmtiJavaThreadEventTransition jet(thread);
2595
    jint length = (jint)pointer_delta(code_end, code_begin, sizeof(char));
2596
    jvmtiEventDynamicCodeGenerated callback = env->callbacks()->DynamicCodeGenerated;
2597
    if (callback != nullptr) {
2598
      (*callback)(env->jvmti_external(), name, (void*)code_begin, length);
2599
    }
2600
  }
2601
}
2602

2603
// post a DynamicCodeGenerated event while holding locks in the VM.
2604
void JvmtiExport::post_dynamic_code_generated_while_holding_locks(const char* name,
2605
                                                                  address code_begin, address code_end)
2606
{
2607
  JavaThread* thread = JavaThread::current();
2608
  // register the stub with the current dynamic code event collector
2609
  // Cannot take safepoint here so do not use state_for to get
2610
  // jvmti thread state.
2611
  // The collector and/or state might be null if JvmtiDynamicCodeEventCollector
2612
  // has been initialized while JVMTI_EVENT_DYNAMIC_CODE_GENERATED was disabled.
2613
  JvmtiThreadState *state = get_jvmti_thread_state(thread);
2614
  if (state != nullptr) {
2615
    JvmtiDynamicCodeEventCollector *collector = state->get_dynamic_code_event_collector();
2616
    if (collector != nullptr) {
2617
      collector->register_stub(name, code_begin, code_end);
2618
    }
2619
  }
2620
}
2621

2622
// Collect all the vm internally allocated objects which are visible to java world
2623
void JvmtiExport::record_vm_internal_object_allocation(oop obj) {
2624
  Thread* thread = Thread::current_or_null();
2625
  if (thread != nullptr && thread->is_Java_thread())  {
2626
    // Can not take safepoint here.
2627
    NoSafepointVerifier no_sfpt;
2628
    // Cannot take safepoint here so do not use state_for to get
2629
    // jvmti thread state.
2630
    JvmtiThreadState *state = JavaThread::cast(thread)->jvmti_thread_state();
2631
    if (state != nullptr) {
2632
      // state is non null when VMObjectAllocEventCollector is enabled.
2633
      JvmtiVMObjectAllocEventCollector *collector;
2634
      collector = state->get_vm_object_alloc_event_collector();
2635
      if (collector != nullptr && collector->is_enabled()) {
2636
        // Don't record classes as these will be notified via the ClassLoad
2637
        // event.
2638
        if (obj->klass() != vmClasses::Class_klass()) {
2639
          collector->record_allocation(obj);
2640
        }
2641
      }
2642
    }
2643
  }
2644
}
2645

2646
// Collect all the sampled allocated objects.
2647
void JvmtiExport::record_sampled_internal_object_allocation(oop obj) {
2648
  Thread* thread = Thread::current_or_null();
2649
  if (thread != nullptr && thread->is_Java_thread())  {
2650
    // Can not take safepoint here.
2651
    NoSafepointVerifier no_sfpt;
2652
    // Cannot take safepoint here so do not use state_for to get
2653
    // jvmti thread state.
2654
    JvmtiThreadState *state = JavaThread::cast(thread)->jvmti_thread_state();
2655
    if (state != nullptr) {
2656
      // state is non null when SampledObjectAllocEventCollector is enabled.
2657
      JvmtiSampledObjectAllocEventCollector *collector;
2658
      collector = state->get_sampled_object_alloc_event_collector();
2659

2660
      if (collector != nullptr && collector->is_enabled()) {
2661
        collector->record_allocation(obj);
2662
      }
2663
    }
2664
  }
2665
}
2666

2667
void JvmtiExport::post_garbage_collection_finish() {
2668
  Thread *thread = Thread::current(); // this event is posted from VM-Thread.
2669
  EVT_TRIG_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_FINISH,
2670
                 ("[%s] garbage collection finish event triggered",
2671
                  JvmtiTrace::safe_get_thread_name(thread)));
2672
  JvmtiEnvIterator it;
2673
  for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
2674
    if (env->is_enabled(JVMTI_EVENT_GARBAGE_COLLECTION_FINISH)) {
2675
      EVT_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_FINISH,
2676
                ("[%s] garbage collection finish event sent",
2677
                 JvmtiTrace::safe_get_thread_name(thread)));
2678
      JvmtiThreadEventTransition jet(thread);
2679
      // JNIEnv is null here because this event is posted from VM Thread
2680
      jvmtiEventGarbageCollectionFinish callback = env->callbacks()->GarbageCollectionFinish;
2681
      if (callback != nullptr) {
2682
        (*callback)(env->jvmti_external());
2683
      }
2684
    }
2685
  }
2686
}
2687

2688
void JvmtiExport::post_garbage_collection_start() {
2689
  Thread* thread = Thread::current(); // this event is posted from vm-thread.
2690
  EVT_TRIG_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_START,
2691
                 ("[%s] garbage collection start event triggered",
2692
                  JvmtiTrace::safe_get_thread_name(thread)));
2693
  JvmtiEnvIterator it;
2694
  for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
2695
    if (env->is_enabled(JVMTI_EVENT_GARBAGE_COLLECTION_START)) {
2696
      EVT_TRACE(JVMTI_EVENT_GARBAGE_COLLECTION_START,
2697
                ("[%s] garbage collection start event sent",
2698
                 JvmtiTrace::safe_get_thread_name(thread)));
2699
      JvmtiThreadEventTransition jet(thread);
2700
      // JNIEnv is null here because this event is posted from VM Thread
2701
      jvmtiEventGarbageCollectionStart callback = env->callbacks()->GarbageCollectionStart;
2702
      if (callback != nullptr) {
2703
        (*callback)(env->jvmti_external());
2704
      }
2705
    }
2706
  }
2707
}
2708

2709
void JvmtiExport::post_data_dump() {
2710
  Thread *thread = Thread::current();
2711
  EVT_TRIG_TRACE(JVMTI_EVENT_DATA_DUMP_REQUEST,
2712
                 ("[%s] data dump request event triggered",
2713
                  JvmtiTrace::safe_get_thread_name(thread)));
2714
  JvmtiEnvIterator it;
2715
  for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
2716
    if (env->is_enabled(JVMTI_EVENT_DATA_DUMP_REQUEST)) {
2717
      EVT_TRACE(JVMTI_EVENT_DATA_DUMP_REQUEST,
2718
                ("[%s] data dump request event sent",
2719
                 JvmtiTrace::safe_get_thread_name(thread)));
2720
     JvmtiThreadEventTransition jet(thread);
2721
     // JNIEnv is null here because this event is posted from VM Thread
2722
     jvmtiEventDataDumpRequest callback = env->callbacks()->DataDumpRequest;
2723
     if (callback != nullptr) {
2724
       (*callback)(env->jvmti_external());
2725
     }
2726
    }
2727
  }
2728
}
2729

2730
void JvmtiExport::post_monitor_contended_enter(JavaThread *thread, ObjectMonitor *obj_mntr) {
2731
  oop object = obj_mntr->object();
2732
  HandleMark hm(thread);
2733
  Handle h(thread, object);
2734

2735
  JvmtiThreadState *state = get_jvmti_thread_state(thread);
2736
  if (state == nullptr) {
2737
    return;
2738
  }
2739
  if (thread->is_in_any_VTMS_transition()) {
2740
    return; // no events should be posted if thread is in any VTMS transition
2741
  }
2742

2743
  EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTER,
2744
                     ("[%s] monitor contended enter event triggered",
2745
                      JvmtiTrace::safe_get_thread_name(thread)));
2746
  JvmtiEnvThreadStateIterator it(state);
2747
  for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
2748
    if (ets->is_enabled(JVMTI_EVENT_MONITOR_CONTENDED_ENTER)) {
2749
      EVT_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTER,
2750
                   ("[%s] monitor contended enter event sent",
2751
                    JvmtiTrace::safe_get_thread_name(thread)));
2752
      JvmtiMonitorEventMark  jem(thread, h());
2753
      JvmtiEnv *env = ets->get_env();
2754
      JvmtiThreadEventTransition jet(thread);
2755
      jvmtiEventMonitorContendedEnter callback = env->callbacks()->MonitorContendedEnter;
2756
      if (callback != nullptr) {
2757
        (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_object());
2758
      }
2759
    }
2760
  }
2761
}
2762

2763
void JvmtiExport::post_monitor_contended_entered(JavaThread *thread, ObjectMonitor *obj_mntr) {
2764
  oop object = obj_mntr->object();
2765
  HandleMark hm(thread);
2766
  Handle h(thread, object);
2767

2768
  JvmtiThreadState *state = get_jvmti_thread_state(thread);
2769
  if (state == nullptr) {
2770
    return;
2771
  }
2772
  if (thread->is_in_any_VTMS_transition()) {
2773
    return; // no events should be posted if thread is in any VTMS transition
2774
  }
2775

2776
  EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTERED,
2777
                     ("[%s] monitor contended entered event triggered",
2778
                      JvmtiTrace::safe_get_thread_name(thread)));
2779

2780
  JvmtiEnvThreadStateIterator it(state);
2781
  for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
2782
    if (ets->is_enabled(JVMTI_EVENT_MONITOR_CONTENDED_ENTERED)) {
2783
      EVT_TRACE(JVMTI_EVENT_MONITOR_CONTENDED_ENTERED,
2784
                   ("[%s] monitor contended enter event sent",
2785
                    JvmtiTrace::safe_get_thread_name(thread)));
2786
      JvmtiMonitorEventMark  jem(thread, h());
2787
      JvmtiEnv *env = ets->get_env();
2788
      JvmtiThreadEventTransition jet(thread);
2789
      jvmtiEventMonitorContendedEntered callback = env->callbacks()->MonitorContendedEntered;
2790
      if (callback != nullptr) {
2791
        (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(), jem.jni_object());
2792
      }
2793
    }
2794
  }
2795
}
2796

2797
void JvmtiExport::post_monitor_wait(JavaThread *thread, oop object,
2798
                                          jlong timeout) {
2799
  HandleMark hm(thread);
2800
  Handle h(thread, object);
2801

2802
  JvmtiThreadState *state = get_jvmti_thread_state(thread);
2803
  if (state == nullptr) {
2804
    return;
2805
  }
2806
  if (thread->is_in_any_VTMS_transition()) {
2807
    return; // no events should be posted if thread is in any VTMS transition
2808
  }
2809

2810
  EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_WAIT,
2811
                     ("[%s] monitor wait event triggered",
2812
                      JvmtiTrace::safe_get_thread_name(thread)));
2813
  JvmtiEnvThreadStateIterator it(state);
2814
  for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
2815
    if (ets->is_enabled(JVMTI_EVENT_MONITOR_WAIT)) {
2816
      EVT_TRACE(JVMTI_EVENT_MONITOR_WAIT,
2817
                   ("[%s] monitor wait event sent",
2818
                    JvmtiTrace::safe_get_thread_name(thread)));
2819
      JvmtiMonitorEventMark  jem(thread, h());
2820
      JvmtiEnv *env = ets->get_env();
2821
      JvmtiThreadEventTransition jet(thread);
2822
      jvmtiEventMonitorWait callback = env->callbacks()->MonitorWait;
2823
      if (callback != nullptr) {
2824
        (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2825
                    jem.jni_object(), timeout);
2826
      }
2827
    }
2828
  }
2829
}
2830

2831
void JvmtiExport::post_monitor_waited(JavaThread *thread, ObjectMonitor *obj_mntr, jboolean timed_out) {
2832
  oop object = obj_mntr->object();
2833
  HandleMark hm(thread);
2834
  Handle h(thread, object);
2835

2836
  JvmtiThreadState *state = get_jvmti_thread_state(thread);
2837
  if (state == nullptr) {
2838
    return;
2839
  }
2840
  if (thread->is_in_any_VTMS_transition()) {
2841
    return; // no events should be posted if thread is in any VTMS transition
2842
  }
2843

2844
  EVT_TRIG_TRACE(JVMTI_EVENT_MONITOR_WAITED,
2845
                     ("[%s] monitor waited event triggered",
2846
                      JvmtiTrace::safe_get_thread_name(thread)));
2847
  JvmtiEnvThreadStateIterator it(state);
2848
  for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
2849
    if (ets->is_enabled(JVMTI_EVENT_MONITOR_WAITED)) {
2850
      EVT_TRACE(JVMTI_EVENT_MONITOR_WAITED,
2851
                   ("[%s] monitor waited event sent",
2852
                    JvmtiTrace::safe_get_thread_name(thread)));
2853
      JvmtiMonitorEventMark  jem(thread, h());
2854
      JvmtiEnv *env = ets->get_env();
2855
      JvmtiThreadEventTransition jet(thread);
2856
      jvmtiEventMonitorWaited callback = env->callbacks()->MonitorWaited;
2857
      if (callback != nullptr) {
2858
        (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2859
                    jem.jni_object(), timed_out);
2860
      }
2861
    }
2862
  }
2863
}
2864

2865
void JvmtiExport::post_vm_object_alloc(JavaThread *thread, oop object) {
2866
  if (object == nullptr) {
2867
    return;
2868
  }
2869
  if (thread->is_in_any_VTMS_transition()) {
2870
    return; // no events should be posted if thread is in any VTMS transition
2871
  }
2872
  HandleMark hm(thread);
2873
  Handle h(thread, object);
2874

2875
  EVT_TRIG_TRACE(JVMTI_EVENT_VM_OBJECT_ALLOC, ("[%s] Trg vm object alloc triggered",
2876
                      JvmtiTrace::safe_get_thread_name(thread)));
2877
  JvmtiEnvIterator it;
2878
  for (JvmtiEnv* env = it.first(); env != nullptr; env = it.next(env)) {
2879
    if (env->is_enabled(JVMTI_EVENT_VM_OBJECT_ALLOC)) {
2880
      EVT_TRACE(JVMTI_EVENT_VM_OBJECT_ALLOC, ("[%s] Evt vmobject alloc sent %s",
2881
                                         JvmtiTrace::safe_get_thread_name(thread),
2882
                                         object==nullptr? "null" : object->klass()->external_name()));
2883

2884
      JvmtiObjectAllocEventMark jem(thread, h());
2885
      JvmtiJavaThreadEventTransition jet(thread);
2886
      jvmtiEventVMObjectAlloc callback = env->callbacks()->VMObjectAlloc;
2887
      if (callback != nullptr) {
2888
        (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2889
                    jem.jni_jobject(), jem.jni_class(), jem.size());
2890
      }
2891
    }
2892
  }
2893
}
2894

2895
void JvmtiExport::post_sampled_object_alloc(JavaThread *thread, oop object) {
2896
  HandleMark hm(thread);
2897
  Handle h(thread, object);
2898

2899
  JvmtiThreadState *state = get_jvmti_thread_state(thread);
2900
  if (state == nullptr) {
2901
    return;
2902
  }
2903
  if (object == nullptr) {
2904
    return;
2905
  }
2906
  if (thread->is_in_any_VTMS_transition()) {
2907
    return; // no events should be posted if thread is in any VTMS transition
2908
  }
2909

2910
  EVT_TRIG_TRACE(JVMTI_EVENT_SAMPLED_OBJECT_ALLOC,
2911
                 ("[%s] Trg sampled object alloc triggered",
2912
                  JvmtiTrace::safe_get_thread_name(thread)));
2913
  JvmtiEnvThreadStateIterator it(state);
2914
  for (JvmtiEnvThreadState* ets = it.first(); ets != nullptr; ets = it.next(ets)) {
2915
    if (ets->is_enabled(JVMTI_EVENT_SAMPLED_OBJECT_ALLOC)) {
2916
      EVT_TRACE(JVMTI_EVENT_SAMPLED_OBJECT_ALLOC,
2917
                ("[%s] Evt sampled object alloc sent %s",
2918
                 JvmtiTrace::safe_get_thread_name(thread),
2919
                 object == nullptr ? "null" : object->klass()->external_name()));
2920

2921
      JvmtiEnv *env = ets->get_env();
2922
      JvmtiObjectAllocEventMark jem(thread, h());
2923
      JvmtiJavaThreadEventTransition jet(thread);
2924
      jvmtiEventSampledObjectAlloc callback = env->callbacks()->SampledObjectAlloc;
2925
      if (callback != nullptr) {
2926
        (*callback)(env->jvmti_external(), jem.jni_env(), jem.jni_thread(),
2927
                    jem.jni_jobject(), jem.jni_class(), jem.size());
2928
      }
2929
    }
2930
  }
2931
}
2932

2933
////////////////////////////////////////////////////////////////////////////////////////////////
2934

2935
void JvmtiExport::cleanup_thread(JavaThread* thread) {
2936
  assert(JavaThread::current() == thread, "thread is not current");
2937
  MutexLocker mu(thread, JvmtiThreadState_lock);
2938

2939
  if (thread->jvmti_thread_state() != nullptr) {
2940
    // This has to happen after the thread state is removed, which is
2941
    // why it is not in post_thread_end_event like its complement
2942
    // Maybe both these functions should be rolled into the posts?
2943
    JvmtiEventController::thread_ended(thread);
2944
  }
2945
}
2946

2947
void JvmtiExport::clear_detected_exception(JavaThread* thread) {
2948
  assert(JavaThread::current() == thread, "thread is not current");
2949

2950
  JvmtiThreadState* state = thread->jvmti_thread_state();
2951
  if (state != nullptr) {
2952
    state->clear_exception_state();
2953
  }
2954
}
2955

2956
// Onload raw monitor transition.
2957
void JvmtiExport::transition_pending_onload_raw_monitors() {
2958
  JvmtiPendingMonitors::transition_raw_monitors();
2959
}
2960

2961
// Setup current current thread for event collection.
2962
void JvmtiEventCollector::setup_jvmti_thread_state() {
2963
  // set this event collector to be the current one.
2964
  JvmtiThreadState* state = JvmtiThreadState::state_for(JavaThread::current());
2965
  // state can only be null if the current thread is exiting which
2966
  // should not happen since we're trying to configure for event collection
2967
  guarantee(state != nullptr, "exiting thread called setup_jvmti_thread_state");
2968
  if (is_vm_object_alloc_event()) {
2969
    JvmtiVMObjectAllocEventCollector *prev = state->get_vm_object_alloc_event_collector();
2970

2971
    // If we have a previous collector and it is disabled, it means this allocation came from a
2972
    // callback induced VM Object allocation, do not register this collector then.
2973
    if (prev && !prev->is_enabled()) {
2974
      return;
2975
    }
2976
    _prev = prev;
2977
    state->set_vm_object_alloc_event_collector((JvmtiVMObjectAllocEventCollector *)this);
2978
  } else if (is_dynamic_code_event()) {
2979
    _prev = state->get_dynamic_code_event_collector();
2980
    state->set_dynamic_code_event_collector((JvmtiDynamicCodeEventCollector *)this);
2981
  } else if (is_sampled_object_alloc_event()) {
2982
    JvmtiSampledObjectAllocEventCollector *prev = state->get_sampled_object_alloc_event_collector();
2983

2984
    if (prev) {
2985
      // JvmtiSampledObjectAllocEventCollector wants only one active collector
2986
      // enabled. This allows to have a collector detect a user code requiring
2987
      // a sample in the callback.
2988
      return;
2989
    }
2990
    state->set_sampled_object_alloc_event_collector((JvmtiSampledObjectAllocEventCollector*) this);
2991
  }
2992

2993
  _unset_jvmti_thread_state = true;
2994
}
2995

2996
// Unset current event collection in this thread and reset it with previous
2997
// collector.
2998
void JvmtiEventCollector::unset_jvmti_thread_state() {
2999
  if (!_unset_jvmti_thread_state) {
3000
    return;
3001
  }
3002

3003
  JvmtiThreadState* state = JavaThread::current()->jvmti_thread_state();
3004
  if (state != nullptr) {
3005
    // restore the previous event collector (if any)
3006
    if (is_vm_object_alloc_event()) {
3007
      if (state->get_vm_object_alloc_event_collector() == this) {
3008
        state->set_vm_object_alloc_event_collector((JvmtiVMObjectAllocEventCollector *)_prev);
3009
      } else {
3010
        // this thread's jvmti state was created during the scope of
3011
        // the event collector.
3012
      }
3013
    } else if (is_dynamic_code_event()) {
3014
      if (state->get_dynamic_code_event_collector() == this) {
3015
        state->set_dynamic_code_event_collector((JvmtiDynamicCodeEventCollector *)_prev);
3016
      } else {
3017
        // this thread's jvmti state was created during the scope of
3018
        // the event collector.
3019
      }
3020
    } else if (is_sampled_object_alloc_event()) {
3021
      if (state->get_sampled_object_alloc_event_collector() == this) {
3022
        state->set_sampled_object_alloc_event_collector((JvmtiSampledObjectAllocEventCollector*)_prev);
3023
      } else {
3024
        // this thread's jvmti state was created during the scope of
3025
        // the event collector.
3026
      }
3027
    }
3028
  }
3029
}
3030

3031
// create the dynamic code event collector
3032
JvmtiDynamicCodeEventCollector::JvmtiDynamicCodeEventCollector() : _code_blobs(nullptr) {
3033
  if (JvmtiExport::should_post_dynamic_code_generated()) {
3034
    setup_jvmti_thread_state();
3035
  }
3036
}
3037

3038
// iterate over any code blob descriptors collected and post a
3039
// DYNAMIC_CODE_GENERATED event to the profiler.
3040
JvmtiDynamicCodeEventCollector::~JvmtiDynamicCodeEventCollector() {
3041
  assert(!JavaThread::current()->owns_locks(), "all locks must be released to post deferred events");
3042
 // iterate over any code blob descriptors that we collected
3043
 if (_code_blobs != nullptr) {
3044
   for (int i=0; i<_code_blobs->length(); i++) {
3045
     JvmtiCodeBlobDesc* blob = _code_blobs->at(i);
3046
     JvmtiExport::post_dynamic_code_generated(blob->name(), blob->code_begin(), blob->code_end());
3047
     FreeHeap(blob);
3048
   }
3049
   delete _code_blobs;
3050
 }
3051
 unset_jvmti_thread_state();
3052
}
3053

3054
// register a stub
3055
void JvmtiDynamicCodeEventCollector::register_stub(const char* name, address start, address end) {
3056
 if (_code_blobs == nullptr) {
3057
   _code_blobs = new (mtServiceability) GrowableArray<JvmtiCodeBlobDesc*>(1, mtServiceability);
3058
 }
3059
 _code_blobs->append(new JvmtiCodeBlobDesc(name, start, end));
3060
}
3061

3062
// Setup current thread to record vm allocated objects.
3063
JvmtiObjectAllocEventCollector::JvmtiObjectAllocEventCollector() :
3064
    _allocated(nullptr), _enable(false), _post_callback(nullptr) {
3065
}
3066

3067
// Post vm_object_alloc event for vm allocated objects visible to java
3068
// world.
3069
void JvmtiObjectAllocEventCollector::generate_call_for_allocated() {
3070
  if (_allocated) {
3071
    set_enabled(false);
3072
    for (int i = 0; i < _allocated->length(); i++) {
3073
      oop obj = _allocated->at(i).resolve();
3074
      _post_callback(JavaThread::current(), obj);
3075
      // Release OopHandle
3076
      _allocated->at(i).release(JvmtiExport::jvmti_oop_storage());
3077

3078
    }
3079
    delete _allocated, _allocated = nullptr;
3080
  }
3081
}
3082

3083
void JvmtiObjectAllocEventCollector::record_allocation(oop obj) {
3084
  assert(is_enabled(), "Object alloc event collector is not enabled");
3085
  if (_allocated == nullptr) {
3086
    _allocated = new (mtServiceability) GrowableArray<OopHandle>(1, mtServiceability);
3087
  }
3088
  _allocated->push(OopHandle(JvmtiExport::jvmti_oop_storage(), obj));
3089
}
3090

3091
// Disable collection of VMObjectAlloc events
3092
NoJvmtiVMObjectAllocMark::NoJvmtiVMObjectAllocMark() : _collector(nullptr) {
3093
  // a no-op if VMObjectAlloc event is not enabled
3094
  if (!JvmtiExport::should_post_vm_object_alloc()) {
3095
    return;
3096
  }
3097
  Thread* thread = Thread::current_or_null();
3098
  if (thread != nullptr && thread->is_Java_thread())  {
3099
    JavaThread* current_thread = JavaThread::cast(thread);
3100
    JvmtiThreadState *state = current_thread->jvmti_thread_state();
3101
    if (state != nullptr) {
3102
      JvmtiVMObjectAllocEventCollector *collector;
3103
      collector = state->get_vm_object_alloc_event_collector();
3104
      if (collector != nullptr && collector->is_enabled()) {
3105
        _collector = collector;
3106
        _collector->set_enabled(false);
3107
      }
3108
    }
3109
  }
3110
}
3111

3112
// Re-Enable collection of VMObjectAlloc events (if previously enabled)
3113
NoJvmtiVMObjectAllocMark::~NoJvmtiVMObjectAllocMark() {
3114
  if (was_enabled()) {
3115
    _collector->set_enabled(true);
3116
  }
3117
};
3118

3119
// Setup current thread to record vm allocated objects.
3120
JvmtiVMObjectAllocEventCollector::JvmtiVMObjectAllocEventCollector() {
3121
  if (JvmtiExport::should_post_vm_object_alloc()) {
3122
    _enable = true;
3123
    setup_jvmti_thread_state();
3124
    _post_callback = JvmtiExport::post_vm_object_alloc;
3125
  }
3126
}
3127

3128
JvmtiVMObjectAllocEventCollector::~JvmtiVMObjectAllocEventCollector() {
3129
  if (_enable) {
3130
    generate_call_for_allocated();
3131
  }
3132
  unset_jvmti_thread_state();
3133
}
3134

3135
bool JvmtiSampledObjectAllocEventCollector::object_alloc_is_safe_to_sample() {
3136
  Thread* thread = Thread::current();
3137
  // Really only sample allocations if this is a JavaThread and not the compiler
3138
  // thread.
3139
  if (!thread->is_Java_thread() || thread->is_Compiler_thread()) {
3140
    return false;
3141
  }
3142

3143
  // If the current thread is attaching from native and its Java thread object
3144
  // is being allocated, things are not ready for allocation sampling.
3145
  JavaThread* jt = JavaThread::cast(thread);
3146
  if (jt->is_attaching_via_jni() && jt->threadObj() == nullptr) {
3147
    return false;
3148
  }
3149

3150
  return true;
3151
}
3152

3153
// Setup current thread to record sampled allocated objects.
3154
void JvmtiSampledObjectAllocEventCollector::start() {
3155
  if (JvmtiExport::should_post_sampled_object_alloc()) {
3156
    if (!object_alloc_is_safe_to_sample()) {
3157
      return;
3158
    }
3159

3160
    _enable = true;
3161
    setup_jvmti_thread_state();
3162
    _post_callback = JvmtiExport::post_sampled_object_alloc;
3163
  }
3164
}
3165

3166
JvmtiSampledObjectAllocEventCollector::~JvmtiSampledObjectAllocEventCollector() {
3167
  if (!_enable) {
3168
    return;
3169
  }
3170

3171
  generate_call_for_allocated();
3172
  unset_jvmti_thread_state();
3173

3174
  // Unset the sampling collector as present in assertion mode only.
3175
  assert(Thread::current()->is_Java_thread(),
3176
         "Should always be in a Java thread");
3177
}
3178

3179
JvmtiGCMarker::JvmtiGCMarker() {
3180
  // if there aren't any JVMTI environments then nothing to do
3181
  if (!JvmtiEnv::environments_might_exist()) {
3182
    return;
3183
  }
3184

3185
  if (JvmtiExport::should_post_garbage_collection_start()) {
3186
    JvmtiExport::post_garbage_collection_start();
3187
  }
3188

3189
  if (SafepointSynchronize::is_at_safepoint()) {
3190
    // Do clean up tasks that need to be done at a safepoint
3191
    JvmtiEnvBase::check_for_periodic_clean_up();
3192
  }
3193
}
3194

3195
JvmtiGCMarker::~JvmtiGCMarker() {
3196
  // if there aren't any JVMTI environments then nothing to do
3197
  if (!JvmtiEnv::environments_might_exist()) {
3198
    return;
3199
  }
3200

3201
  // JVMTI notify gc finish
3202
  if (JvmtiExport::should_post_garbage_collection_finish()) {
3203
    JvmtiExport::post_garbage_collection_finish();
3204
  }
3205
}
3206
jdk

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