180 lines
6.0 KiB
C++
180 lines
6.0 KiB
C++
/*
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* Copyright (c) 2019, 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 <string.h>
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#include "jvmti.h"
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#include "jvmti_common.hpp"
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extern "C" {
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#define MAX_FRAME_COUNT 20
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#define FRAMES_TO_NOTIFY_POP 7
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static jvmtiEnv *jvmti = nullptr;
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static jthread exp_thread = nullptr;
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static jrawMonitorID event_mon = nullptr;
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static int method_entry_count = 0;
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static int frame_pop_count = 0;
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static void
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print_frame_event_info(jvmtiEnv *jvmti, JNIEnv* jni, jthread thread, jmethodID method, const char* event_name) {
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char* tname = get_thread_name(jvmti, jni, thread);
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char* cname = get_method_class_name(jvmti, jni, method);
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char* mname = nullptr;
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char* msign = nullptr;
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jboolean is_virtual = jni->IsVirtualThread(thread);
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const char* virt = is_virtual ? "virtual" : "carrier";
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jvmtiError err;
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err = jvmti->GetMethodName(method, &mname, &msign, nullptr);
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check_jvmti_status(jni, err, "event handler: error in JVMTI GetMethodName call");
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if (strcmp(event_name, "MethodEntry") == 0) {
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LOG("%s event #%d: %s thread: %s, method: %s: %s%s\n",
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event_name, method_entry_count, virt, tname, cname, mname, msign);
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} else {
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LOG("%s event #%d: %s thread: %s, method: %s: %s%s\n",
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event_name, frame_pop_count, virt, tname, cname, mname, msign);
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}
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deallocate(jvmti, jni, (void*)tname);
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deallocate(jvmti, jni, (void*)cname);
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deallocate(jvmti, jni, (void*)mname);
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deallocate(jvmti, jni, (void*)msign);
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}
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static void JNICALL
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MethodEntry(jvmtiEnv *jvmti, JNIEnv* jni, jthread thread, jmethodID method) {
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char* mname = get_method_name(jvmti, jni, method);
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jvmtiError err;
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RawMonitorLocker rml(jvmti, jni, event_mon);
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if (strcmp(mname, "yield0") == 0) {
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print_frame_event_info(jvmti, jni, thread, method, "MethodEntry");
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LOG("\nMethodEntry: Requesting FramePop notifications for %d frames:\n", FRAMES_TO_NOTIFY_POP);
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// Request FramePop notifications for all continuation frames.
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// They all are expected to be cleared as a part of yield protocol.
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for (jint depth = 0; depth < FRAMES_TO_NOTIFY_POP; depth++) {
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jmethodID frame_method = nullptr;
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jlocation location = 0LL;
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err = jvmti->NotifyFramePop(thread, depth);
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check_jvmti_status(jni, err, "MethodEntry: error in JVMTI NotifyFramePop");
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err = jvmti->GetFrameLocation(thread, depth, &frame_method, &location);
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check_jvmti_status(jni, err, "MethodEntry: error in JVMTI GetFrameLocation");
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print_method(jvmti, jni, frame_method, depth);
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}
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LOG("\n");
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}
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deallocate(jvmti, jni, (void*)mname);
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}
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static void JNICALL
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FramePop(jvmtiEnv *jvmti, JNIEnv* jni, jthread thread, jmethodID method,
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jboolean was_popped_by_exception) {
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RawMonitorLocker rml(jvmti, jni, event_mon);
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frame_pop_count++;
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print_frame_event_info(jvmti, jni, thread, method, "FramePop");
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}
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JNIEXPORT jint JNICALL
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Agent_OnLoad(JavaVM *jvm, char *options, void *reserved) {
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jvmtiEventCallbacks callbacks;
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jvmtiCapabilities caps;
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jvmtiError err;
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LOG("Agent_OnLoad started\n");
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if (jvm->GetEnv((void **) (&jvmti), JVMTI_VERSION) != JNI_OK) {
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return JNI_ERR;
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}
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memset(&callbacks, 0, sizeof(callbacks));
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callbacks.MethodEntry = &MethodEntry;
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callbacks.FramePop = &FramePop;
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memset(&caps, 0, sizeof(caps));
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caps.can_generate_method_entry_events = 1;
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caps.can_generate_frame_pop_events = 1;
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err = jvmti->AddCapabilities(&caps);
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if (err != JVMTI_ERROR_NONE) {
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LOG("Agent_OnLoad: Error in JVMTI AddCapabilities: %d\n", err);
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}
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err = jvmti->SetEventCallbacks(&callbacks, sizeof(jvmtiEventCallbacks));
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if (err != JVMTI_ERROR_NONE) {
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LOG("Agent_OnLoad: Error in JVMTI SetEventCallbacks: %d\n", err);
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}
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event_mon = create_raw_monitor(jvmti, "Events Monitor");
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LOG("Agent_OnLoad finished\n");
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return JNI_OK;
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}
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JNIEXPORT void JNICALL
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Java_ContinuationTest_enableEvents(JNIEnv *jni, jclass cls, jthread thread) {
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jvmtiError err;
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LOG("enableEvents: started\n");
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exp_thread = (jthread)jni->NewGlobalRef(thread);
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err = jvmti->SetEventNotificationMode(JVMTI_ENABLE, JVMTI_EVENT_METHOD_ENTRY, thread);
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check_jvmti_status(jni, err, "enableEvents: error in JVMTI SetEventNotificationMode: enable METHOD_ENTRY");
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err = jvmti->SetEventNotificationMode(JVMTI_ENABLE, JVMTI_EVENT_FRAME_POP, thread);
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check_jvmti_status(jni, err, "enableEvents: error in JVMTI SetEventNotificationMode: enable FRAME_POP");
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LOG("enableEvents: finished\n");
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}
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JNIEXPORT jboolean JNICALL
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Java_ContinuationTest_check(JNIEnv *jni, jclass cls) {
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jvmtiError err;
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LOG("\n");
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LOG("check: started\n");
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err = jvmti->SetEventNotificationMode(JVMTI_DISABLE, JVMTI_EVENT_METHOD_ENTRY, exp_thread);
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check_jvmti_status(jni, err, "enableEvents: error in JVMTI SetEventNotificationMode: disable METHOD_ENTRY");
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err = jvmti->SetEventNotificationMode(JVMTI_DISABLE, JVMTI_EVENT_FRAME_POP, exp_thread);
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check_jvmti_status(jni, err, "error in JVMTI SetEventNotificationMode: disable FRAME_POP");
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LOG("check: finished\n");
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LOG("\n");
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return frame_pop_count == 0;
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}
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} // extern "C"
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