8340698: JVMTI FRAME_POP event is sometimes missed if NotifyFramePop is called as a method is returning
Reviewed-by: cjplummer, amenkov
This commit is contained in:
parent
078401134a
commit
8591109419
@ -1332,7 +1332,7 @@ JvmtiEnvBase::set_frame_pop(JvmtiThreadState* state, javaVFrame* jvf, jint depth
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if (jvf == nullptr) {
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return JVMTI_ERROR_NO_MORE_FRAMES;
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}
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if (jvf->method()->is_native()) {
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if (jvf->method()->is_native() || (depth == 0 && state->top_frame_is_exiting())) {
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return JVMTI_ERROR_OPAQUE_FRAME;
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}
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assert(jvf->frame_pointer() != nullptr, "frame pointer mustn't be null");
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@ -1874,6 +1874,10 @@ void JvmtiExport::post_method_exit(JavaThread* thread, Method* method, frame cur
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}
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}
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// Do not allow NotifyFramePop to add new FramePop event request at
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// depth 0 as it is already late in the method exiting dance.
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state->set_top_frame_is_exiting();
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// Deferred transition to VM, so we can stash away the return oop before GC
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// Note that this transition is not needed when throwing an exception, because
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// there is no oop to retain.
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@ -1882,6 +1886,10 @@ void JvmtiExport::post_method_exit(JavaThread* thread, Method* method, frame cur
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post_method_exit_inner(thread, mh, state, exception_exit, current_frame, value);
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JRT_BLOCK_END
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// The JRT_BLOCK_END can safepoint in ThreadInVMfromJava desctructor. Now it is safe to allow
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// adding FramePop event requests as no safepoint can happen before removing activation.
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state->clr_top_frame_is_exiting();
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if (result.not_null() && !mh->is_native()) {
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// We have to restore the oop on the stack for interpreter frames
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*(oop*)current_frame.interpreter_frame_tos_address() = result();
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@ -84,6 +84,7 @@ JvmtiThreadState::JvmtiThreadState(JavaThread* thread, oop thread_oop)
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_earlyret_value.j = 0L;
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_earlyret_oop = nullptr;
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_jvmti_event_queue = nullptr;
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_top_frame_is_exiting = false;
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_is_virtual = false;
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_thread_oop_h = OopHandle(JvmtiExport::jvmti_oop_storage(), thread_oop);
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@ -190,6 +190,7 @@ class JvmtiThreadState : public CHeapObj<mtInternal> {
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bool _pending_interp_only_mode;
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bool _pending_step_for_popframe;
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bool _pending_step_for_earlyret;
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bool _top_frame_is_exiting;
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int _hide_level;
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public:
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@ -357,6 +358,11 @@ class JvmtiThreadState : public CHeapObj<mtInternal> {
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bool is_pending_step_for_earlyret() { return _pending_step_for_earlyret; }
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void process_pending_step_for_earlyret();
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// For synchronization between NotifyFramePop and FramePop posting code.
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void set_top_frame_is_exiting() { _top_frame_is_exiting = true; }
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void clr_top_frame_is_exiting() { _top_frame_is_exiting = false; }
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bool top_frame_is_exiting() { return _top_frame_is_exiting; }
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// Setter and getter method is used to send redefined class info
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// when class file load hook event is posted.
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// It is set while loading redefined class and cleared before the
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@ -0,0 +1,130 @@
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/*
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* Copyright (c) 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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* @test
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* @bug 8340698
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* @summary JVMTI FRAME_POP event is sometimes missed if NotifyFramePop is called as a method is returning
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* @requires vm.jvmti
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* @library /test/lib
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* @compile NotifyFramePopStressTest.java
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* @run main/othervm/native -agentlib:NotifyFramePopStressTest NotifyFramePopStressTest
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*/
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import jtreg.SkippedException;
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public class NotifyFramePopStressTest {
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static volatile boolean done = false;
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public static void main(String args[]) {
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if (!canGenerateFramePopEvents()) {
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throw new SkippedException("FramePop event is not supported");
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}
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Thread testThread = Thread.currentThread();
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Thread controlThread = new Thread(() -> control(testThread), "Control Thread");
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setFramePopNotificationMode(testThread);
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controlThread.start();
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sleep(10);
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for (int i = 0; i < 10*1000; i++) {
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foo();
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bar();
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}
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done = true;
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try {
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controlThread.join();
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} catch (InterruptedException e) {
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}
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if (failed()) {
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throw new RuntimeException("Test FAILED: see log for details");
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} else {
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log("Test PASSED");
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}
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}
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private static void sleep(long ms) {
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try {
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Thread.sleep(ms);
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} catch (InterruptedException e) {
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}
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}
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private static void control(Thread thread) {
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int notifyCount = 0;
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log("control has started");
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while (!done) {
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suspend(thread);
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if (notifyFramePop(thread)) {
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notifyCount++;
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log("control incremented notifyCount to " + notifyCount);
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}
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resume(thread);
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int waitCount = 0;
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while (notifyCount != getPopCount()) {
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sleep(1);
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waitCount++;
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if (waitCount > 1000) {
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break;
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}
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}
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if (waitCount > 100) {
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log("About to fail. notifyCount=" + notifyCount + " getPopCount()=" + getPopCount());
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throw new RuntimeException("Test FAILED: Waited too long for notify: " + waitCount);
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}
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}
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log("control has finished: " + notifyCount);
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}
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private native static void suspend(Thread thread);
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private native static void resume(Thread thread);
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private native static int getPopCount();
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private native static boolean failed();
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private native static boolean canGenerateFramePopEvents();
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private native static void setFramePopNotificationMode(Thread thread);
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private native static boolean notifyFramePop(Thread thread);
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private static void log(String msg) {
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System.out.println(msg);
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}
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private static int fetchIntFoo() {
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return 13;
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}
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private static int fetchIntBar() {
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return 33;
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}
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private static int foo() {
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return fetchIntFoo();
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}
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private static int bar() {
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return fetchIntBar();
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}
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}
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@ -0,0 +1,194 @@
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/*
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* Copyright (c) 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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#include <stdio.h>
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#include <string.h>
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#include "jvmti.h"
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#include "jvmti_common.hpp"
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#ifdef __cplusplus
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extern "C" {
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#endif
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static jvmtiEnv *jvmti;
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static jvmtiCapabilities caps;
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static jvmtiEventCallbacks callbacks;
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static volatile jint pop_count;
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static char* volatile last_notify_method;
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static volatile jboolean failed = JNI_FALSE;
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static jboolean seenMain = JNI_FALSE;
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static jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved);
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JNIEXPORT
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jint JNICALL Agent_OnLoad(JavaVM *jvm, char *options, void *reserved) {
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return Agent_Initialize(jvm, options, reserved);
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}
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JNIEXPORT
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jint JNICALL Agent_OnAttach(JavaVM *jvm, char *options, void *reserved) {
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return Agent_Initialize(jvm, options, reserved);
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}
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JNIEXPORT
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jint JNICALL JNI_OnLoad(JavaVM *jvm, void *reserved) {
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return JNI_VERSION_9;
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}
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static void JNICALL
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FramePop(jvmtiEnv *jvmti, JNIEnv *jni, jthread thread,
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jmethodID method, jboolean wasPoppedByException) {
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jvmtiError err;
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jclass cls = nullptr;
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char* csig = nullptr;
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char* name = nullptr;
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err = jvmti->GetMethodDeclaringClass(method, &cls);
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check_jvmti_status(jni, err, "FramePop: Failed in JVMTI GetMethodDeclaringClass");
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err = jvmti->GetClassSignature(cls, &csig, nullptr);
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check_jvmti_status(jni, err, "FramePop: Failed in JVMTI GetClassSignature");
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name = get_method_name(jvmti, jni, method);
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LOG("FramePop(%d) event from method: %s %s\n", pop_count + 1, csig, name);
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if (strcmp(name, "main") != 0) { // ignore FRAME_POP for main that comes in as the test exits
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if (strcmp(name, (char*)last_notify_method) != 0) {
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LOG("ERROR: FramePop event is for wrong method: expected %s, got %s\n", last_notify_method, name);
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failed = JNI_TRUE;
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}
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}
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pop_count++;
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deallocate(jvmti, jni, csig);
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deallocate(jvmti, jni, name);
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}
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static
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jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved) {
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jint res;
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jvmtiError err;
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res = jvm->GetEnv((void **) &jvmti, JVMTI_VERSION_9);
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if (res != JNI_OK || jvmti == nullptr) {
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LOG("GetEnv(JVMTI_VERSION_9) failed error(%d)", res);
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return JNI_ERR;
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}
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err = jvmti->GetPotentialCapabilities(&caps);
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check_jvmti_error(err, "Agent: GetPotentialCapabilities failed");
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err = jvmti->AddCapabilities(&caps);
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check_jvmti_error(err, "Agent: AddCapabilities failed");
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err = jvmti->GetCapabilities(&caps);
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check_jvmti_error(err, "Agent: GetCapabilities failed");
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if (caps.can_generate_frame_pop_events) {
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callbacks.FramePop = &FramePop;
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err = jvmti->SetEventCallbacks(&callbacks, sizeof(callbacks));
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check_jvmti_error(err, "Agent: SetEventCallbacks failed");
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}
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return JNI_OK;
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}
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JNIEXPORT jboolean JNICALL
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Java_NotifyFramePopStressTest_canGenerateFramePopEvents(JNIEnv *env, jclass cls) {
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return caps.can_generate_frame_pop_events ? JNI_TRUE : JNI_FALSE;
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}
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JNIEXPORT void JNICALL
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Java_NotifyFramePopStressTest_setFramePopNotificationMode(JNIEnv *env, jclass cl, jthread thread) {
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set_event_notification_mode(jvmti, env, JVMTI_ENABLE, JVMTI_EVENT_FRAME_POP, thread);
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}
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/*
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* Call NotifyFramePop on the current frame.
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*/
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JNIEXPORT jboolean JNICALL
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Java_NotifyFramePopStressTest_notifyFramePop(JNIEnv *jni, jclass cls, jthread thread) {
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jmethodID method;
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jlocation loc;
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char* name;
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jvmtiError err;
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jboolean isMain;
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err = jvmti->GetFrameLocation(thread, 0, &method, &loc);
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check_jvmti_status(jni, err, "notifyFramePop: Failed in JVMTI GetFrameLocation");
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name = get_method_name(jvmti, jni, method);
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// We only want to do a NotifyFramePop once for the main method. The sole purpose is
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// to force the thread into interpOnly mode, which seems to help the test's timing
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// in a way that makes it more likely to reproduce the issue.
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isMain = (strcmp(name, "main") == 0);
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if (isMain) {
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if (seenMain) {
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deallocate(jvmti, jni, name);
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return JNI_FALSE; // Only do NotifyFramePop once for main()
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} else {
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seenMain = JNI_TRUE;
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}
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}
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err= jvmti->NotifyFramePop(thread, 0);
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if (err == JVMTI_ERROR_OPAQUE_FRAME || err == JVMTI_ERROR_DUPLICATE) {
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//LOG("\nNotifyFramePop for method %s returned acceptable error: %s\n", name, TranslateError(err));
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deallocate(jvmti, jni, name);
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return JNI_FALSE;
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}
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check_jvmti_status(jni, err, "notifyFramePop: Failed in JVMTI notifyFramePop");
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LOG("\nNotifyFramePop called for method %s\n", name);
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if (isMain) {
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LOG("notifyFramePop not counting main method\n");
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deallocate(jvmti, jni, name);
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return JNI_FALSE;
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} else {
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deallocate(jvmti, jni, last_notify_method);
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last_notify_method = name;
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return JNI_TRUE;
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}
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}
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JNIEXPORT void JNICALL
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Java_NotifyFramePopStressTest_suspend(JNIEnv *jni, jclass cls, jthread thread) {
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suspend_thread(jvmti, jni, thread);
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}
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JNIEXPORT void JNICALL
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Java_NotifyFramePopStressTest_resume(JNIEnv *jni, jclass cls, jthread thread) {
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resume_thread(jvmti, jni, thread);
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}
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JNIEXPORT jint JNICALL
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Java_NotifyFramePopStressTest_getPopCount(JNIEnv *env, jclass cls) {
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return pop_count;
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}
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JNIEXPORT jboolean JNICALL
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Java_NotifyFramePopStressTest_failed(JNIEnv *env, jclass cls) {
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return failed;
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}
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#ifdef __cplusplus
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}
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#endif
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