150 lines
5.2 KiB
C++
150 lines
5.2 KiB
C++
/*
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* Copyright (c) 2022, 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 <cstdlib>
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#include <cstring>
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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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static jvmtiEnv *jvmti;
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static int started_thread_cnt = 0;
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static jrawMonitorID agent_event_lock = nullptr;
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static const char* TESTED_TNAME_START = "Tested-VT";
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static const size_t TESTED_TNAME_START_LEN = strlen(TESTED_TNAME_START);
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static bool can_support_vt_enabled = false;
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void JNICALL ThreadStart(jvmtiEnv *jvmti, JNIEnv* jni, jthread thread) {
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char* tname = get_thread_name(jvmti, jni, thread);
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RawMonitorLocker agent_start_locker(jvmti, jni, agent_event_lock);
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if (tname != nullptr && strncmp(tname, TESTED_TNAME_START, TESTED_TNAME_START_LEN) == 0) {
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jboolean is_virtual = jni->IsVirtualThread(thread);
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if (!is_virtual) {
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fatal(jni, "Failed: tested thread expected to be virtual");
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}
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if (can_support_vt_enabled) {
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fatal(jni, "Failed: expected VirtualThreadStart instead of ThreadStart event");
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}
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printf("ThreadStart event: %s\n", tname);
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started_thread_cnt++;
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}
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deallocate(jvmti, jni, (void*)tname);
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}
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void JNICALL VirtualThreadStart(jvmtiEnv *jvmti, JNIEnv* jni, jthread thread) {
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char* tname = get_thread_name(jvmti, jni, thread);
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RawMonitorLocker agent_start_locker(jvmti, jni, agent_event_lock);
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if (tname != nullptr && strncmp(tname, TESTED_TNAME_START, TESTED_TNAME_START_LEN) == 0) {
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jboolean is_virtual = jni->IsVirtualThread(thread);
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if (!is_virtual) {
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fatal(jni, "Failed: tested thread expected to be virtual");
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}
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if (!can_support_vt_enabled) {
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fatal(jni, "Failed: expected ThreadStart instead of VirtualThreadStart event");
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}
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LOG("VirtualThreadStart event: %s\n", tname);
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started_thread_cnt++;
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}
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deallocate(jvmti, jni, (void*)tname);
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}
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JNIEXPORT jboolean JNICALL
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Java_VirtualThreadStartTest_canSupportVirtualThreads(JNIEnv* jni, jclass clazz) {
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LOG("can_support_virtual_threads: %d\n", can_support_vt_enabled);
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return can_support_vt_enabled ? JNI_TRUE : JNI_FALSE;
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}
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JNIEXPORT jint JNICALL
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Java_VirtualThreadStartTest_getAndResetStartedThreads(JNIEnv* jni, jclass clazz) {
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RawMonitorLocker agent_start_locker(jvmti, jni, agent_event_lock);
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int result = started_thread_cnt;
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started_thread_cnt = 0;
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return result;
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}
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jint agent_init(JavaVM *jvm, char *options, void *reserved) {
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jvmtiCapabilities caps;
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jvmtiEventCallbacks callbacks;
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jvmtiError err;
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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(&caps, 0, sizeof(caps));
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memset(&callbacks, 0, sizeof(callbacks));
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callbacks.ThreadStart = &ThreadStart;
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callbacks.VirtualThreadStart = &VirtualThreadStart;
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if (options != nullptr && strcmp(options, "can_support_virtual_threads") == 0) {
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can_support_vt_enabled = true;
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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("Agent init: error in JVMTI AddCapabilities: %s (%d)\n", TranslateError(err), err);
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return JNI_ERR;
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}
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err = jvmti->SetEventNotificationMode(JVMTI_ENABLE, JVMTI_EVENT_VIRTUAL_THREAD_START, nullptr);
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if (err != JVMTI_ERROR_NONE) {
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LOG("Agent init: error in JVMTI SetEventNotificationMode: %s (%d)\n", TranslateError(err), err);
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return JNI_ERR;
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}
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} else {
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err = jvmti->SetEventNotificationMode(JVMTI_ENABLE, JVMTI_EVENT_THREAD_START, nullptr);
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if (err != JVMTI_ERROR_NONE) {
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LOG("Agent init: error in JVMTI SetEventNotificationMode: %s (%d)\n", TranslateError(err), err);
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return JNI_ERR;
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}
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}
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LOG("agent_init: can_support_virtual_threads: %d\n", caps.can_support_virtual_threads);
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err = jvmti->SetEventCallbacks(&callbacks, (jint)sizeof(callbacks));
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if (err != JVMTI_ERROR_NONE) {
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LOG("Agent init: error in JVMTI AddCapabilities: %s (%d)\n", TranslateError(err), err);
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return JNI_ERR;
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}
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agent_event_lock = create_raw_monitor(jvmti, "agent_event_lock");
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return JNI_OK;
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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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LOG("Agent_OnLoad started\n");
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return agent_init(jvm, options, reserved);
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}
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JNIEXPORT jint JNICALL
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Agent_OnAttach(JavaVM *jvm, char *options, void *reserved) {
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LOG("Agent_OnAttach started\n");
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return agent_init(jvm, options, reserved);
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}
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} // extern "C"
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