142 lines
4.3 KiB
C++
142 lines
4.3 KiB
C++
/*
|
|
* Copyright (c) 2018, 2024, Oracle and/or its affiliates. All rights reserved.
|
|
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
|
|
*
|
|
* This code is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License version 2 only, as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This code is distributed in the hope that it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
* version 2 for more details (a copy is included in the LICENSE file that
|
|
* accompanied this code).
|
|
*
|
|
* You should have received a copy of the GNU General Public License version
|
|
* 2 along with this work; if not, write to the Free Software Foundation,
|
|
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*
|
|
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
|
|
* or visit www.oracle.com if you need additional information or have any
|
|
* questions.
|
|
*/
|
|
|
|
#include <string.h>
|
|
#include "jvmti.h"
|
|
#include "jvmti_common.hpp"
|
|
#include "jvmti_thread.hpp"
|
|
|
|
#define MAX_FRAME_COUNT 80
|
|
|
|
const char CONTINUATION_CLASS_NAME[] = "jdk/internal/vm/Continuation";
|
|
const char CONTINUATION_METHOD_NAME[] = "enter";
|
|
|
|
static void test_stack_trace(jvmtiEnv *jvmti, JNIEnv *jni, jthread vthread) {
|
|
jvmtiFrameInfo frames[MAX_FRAME_COUNT];
|
|
jint count = -1;
|
|
jmethodID method = nullptr;
|
|
jvmtiError err;
|
|
|
|
err = jvmti->GetStackTrace(vthread, 0, MAX_FRAME_COUNT, frames, &count);
|
|
if (err == JVMTI_ERROR_THREAD_NOT_ALIVE) {
|
|
LOG("Agent: No stacktrace for non-alive vthread\n");
|
|
return;
|
|
}
|
|
check_jvmti_status(jni, err, "GetStackTrace returns error");
|
|
if (count <= 0) {
|
|
LOG("Agent: Stacktrace in virtual thread is incorrect: count: %d\n", count);
|
|
print_thread_info(jvmti, jni, vthread);
|
|
print_stack_trace_frames(jvmti, jni, count, frames);
|
|
fatal(jni, "Incorrect frame count");
|
|
}
|
|
|
|
method = frames[count - 1].method;
|
|
|
|
const char* class_name = get_method_class_name(jvmti, jni, method);
|
|
const char* method_name = get_method_name(jvmti, jni, method);
|
|
|
|
if (strcmp(CONTINUATION_CLASS_NAME, class_name) != 0 || strcmp(CONTINUATION_METHOD_NAME, method_name) != 0) {
|
|
LOG("Agent: Stacktrace of virtual thread is incorrect: doesn't start from enter(...):\n");
|
|
print_stack_trace_frames(jvmti, jni, count, frames);
|
|
fatal(jni, "incorrect stacktrace");
|
|
}
|
|
}
|
|
|
|
|
|
/** Agent algorithm. */
|
|
static void JNICALL
|
|
agentProc(jvmtiEnv * jvmti, JNIEnv * jni, void * arg) {
|
|
|
|
static jlong timeout = 0;
|
|
LOG("Agent: wait for thread to start\n");
|
|
if (!agent_wait_for_sync(timeout)) {
|
|
return;
|
|
}
|
|
if (!agent_resume_sync()) {
|
|
return;
|
|
}
|
|
LOG("Agent: started\n");
|
|
|
|
while (true) {
|
|
jthread *threads = nullptr;
|
|
jint count = 0;
|
|
jvmtiError err;
|
|
|
|
sleep_ms(100);
|
|
|
|
err = jvmti->GetAllThreads(&count, &threads);
|
|
if (err == JVMTI_ERROR_WRONG_PHASE) {
|
|
return;
|
|
}
|
|
check_jvmti_status(jni, err, "Error in JVMTI GetAllThreads");
|
|
for (int i = 0; i < count; i++) {
|
|
jthread tested_thread = nullptr;
|
|
|
|
err = GetVirtualThread(jvmti, jni, threads[i], &tested_thread);
|
|
if (err == JVMTI_ERROR_THREAD_NOT_ALIVE) {
|
|
continue;
|
|
}
|
|
if (err == JVMTI_ERROR_WRONG_PHASE) {
|
|
return;
|
|
}
|
|
check_jvmti_status(jni, err, "Error in JVMTI extension GetVirtualThread");
|
|
if (tested_thread != nullptr) {
|
|
test_stack_trace(jvmti, jni, tested_thread);
|
|
}
|
|
}
|
|
check_jvmti_status(jni, jvmti->Deallocate((unsigned char *) threads), "Error in JVMTI Deallocate");
|
|
}
|
|
LOG("Agent: finished\n");
|
|
}
|
|
|
|
|
|
extern JNIEXPORT jint JNICALL Agent_OnLoad(JavaVM *jvm, char *options, void *reserved) {
|
|
jvmtiCapabilities caps;
|
|
jvmtiError err;
|
|
jvmtiEnv* jvmti;
|
|
|
|
LOG("Agent_OnLoad started\n");
|
|
if (jvm->GetEnv((void **) (&jvmti), JVMTI_VERSION) != JNI_OK) {
|
|
return JNI_ERR;
|
|
}
|
|
memset(&caps, 0, sizeof(caps));
|
|
caps.can_support_virtual_threads = 1;
|
|
|
|
err = jvmti->AddCapabilities(&caps);
|
|
if (err != JVMTI_ERROR_NONE) {
|
|
LOG("error in JVMTI AddCapabilities: %d\n", err);
|
|
}
|
|
|
|
err = init_agent_data(jvmti, &agent_data);
|
|
if (err != JVMTI_ERROR_NONE) {
|
|
return JNI_ERR;
|
|
}
|
|
|
|
if (set_agent_proc(agentProc, nullptr) != JNI_TRUE) {
|
|
return JNI_ERR;
|
|
}
|
|
|
|
LOG("Agent_OnLoad finished\n");
|
|
return 0;
|
|
}
|