132 lines
4.3 KiB
C++
132 lines
4.3 KiB
C++
/*
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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 <jni.h>
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#include <jvmti.h>
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#include <stdio.h>
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#include <string.h>
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#include "jvmti_common.hpp"
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extern "C" {
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// set by Agent_OnLoad
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static jvmtiEnv* jvmti = nullptr;
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static jthread* carrier_threads = nullptr;
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static jint cthread_cnt = 0;
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static const char* CTHREAD_NAME_START = "ForkJoinPool";
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static const size_t CTHREAD_NAME_START_LEN = strlen("ForkJoinPool");
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static jint
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get_cthreads(JNIEnv* jni, jthread** cthreads_p) {
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jthread* cthreads = nullptr;
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jint all_cnt = 0;
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jint ct_cnt = 0;
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jvmtiError err = jvmti->GetAllThreads(&all_cnt, &cthreads);
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check_jvmti_status(jni, err, "get_cthreads: error in JVMTI GetAllThreads");
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for (int idx = 0; idx < all_cnt; idx++) {
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jthread thread = cthreads[idx];
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char* tname = get_thread_name(jvmti, jni, thread);
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if (strncmp(tname, CTHREAD_NAME_START, CTHREAD_NAME_START_LEN) == 0) {
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cthreads[ct_cnt++] = jni->NewGlobalRef(thread);
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}
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deallocate(jvmti, jni, tname);
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}
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*cthreads_p = cthreads;
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return ct_cnt;
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}
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static void JNICALL
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SingleStep(jvmtiEnv *jvmti, JNIEnv* jni, jthread thread,
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jmethodID method, jlocation location) {
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jboolean is_virtual = jni->IsVirtualThread(thread);
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if (is_virtual) {
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jni->FatalError("Virtual thread should not have posted single stepping event");
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}
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}
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JNIEXPORT void JNICALL
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Java_CarrierThreadEventNotification_setSingleSteppingMode(JNIEnv* jni, jclass klass, jboolean enable) {
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if (enable) {
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if (cthread_cnt != 0 || carrier_threads != nullptr) {
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jni->FatalError("Should not be set");
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}
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cthread_cnt = get_cthreads(jni, &carrier_threads);
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for (int i = 0; i < cthread_cnt; i++) {
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jthread thread = carrier_threads[i];
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jvmtiError err = jvmti->SetEventNotificationMode(JVMTI_ENABLE, JVMTI_EVENT_SINGLE_STEP, thread);
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check_jvmti_status(jni, err, "event handler: error in JVMTI SetEventNotificationMode for event JVMTI_EVENT_SINGLE_STEP");
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}
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} else {
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if (carrier_threads == nullptr) {
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jni->FatalError("Should be set");
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}
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for (int i = 0; i < cthread_cnt; i++) {
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jthread thread = carrier_threads[i];
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jvmtiError err = jvmti->SetEventNotificationMode(JVMTI_DISABLE, JVMTI_EVENT_SINGLE_STEP, thread);
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check_jvmti_status(jni, err, "event handler: error in JVMTI SetEventNotificationMode for event JVMTI_EVENT_SINGLE_STEP");
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jni->DeleteGlobalRef(thread);
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}
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deallocate(jvmti, jni, carrier_threads);
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cthread_cnt = 0;
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carrier_threads = nullptr;
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}
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}
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JNIEXPORT jint JNICALL 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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printf("Agent_OnLoad: started\n");
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if (jvm->GetEnv((void **) (&jvmti), JVMTI_VERSION) != JNI_OK) {
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LOG("error in GetEnv");
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return JNI_ERR;
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}
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memset(&caps, 0, sizeof(caps));
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caps.can_generate_single_step_events = 1;
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caps.can_support_virtual_threads = 1;
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err = jvmti->AddCapabilities(&caps);
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if (err != JVMTI_ERROR_NONE) {
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LOG("error in JVMTI AddCapabilities: %d\n", err);
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}
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memset(&callbacks, 0, sizeof(callbacks));
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callbacks.SingleStep = &SingleStep;
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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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return 0;
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}
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} // extern "C"
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