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/*
* Copyright (c) 2019 SAP SE. 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 <stdio.h>
#include <string.h>
#include "jvmti.h"
#include "jni.h"
#ifdef __cplusplus
extern "C" {
#endif
#ifndef JNI_ENV_ARG
#ifdef __cplusplus
#define JNI_ENV_ARG(x, y) y
#define JNI_ENV_PTR(x) x
#else
#define JNI_ENV_ARG(x,y) x, y
#define JNI_ENV_PTR(x) (*x)
#endif
#endif
#define FAILED -1
static jvmtiEnv *jvmti;
static jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved);
static void ShowErrorMessage(jvmtiEnv *jvmti, jvmtiError errCode, const char *message) {
char *errMsg;
jvmtiError result;
result = (*jvmti)->GetErrorName(jvmti, errCode, &errMsg);
if (result == JVMTI_ERROR_NONE) {
fprintf(stderr, "%s: %s (%d)\n", message, errMsg, errCode);
(*jvmti)->Deallocate(jvmti, (unsigned char *)errMsg);
} else {
fprintf(stderr, "%s (%d)\n", message, errCode);
}
}
JNIEXPORT jint JNICALL
Agent_OnLoad(JavaVM *jvm, char *options, void *reserved) {
return Agent_Initialize(jvm, options, reserved);
}
JNIEXPORT jint JNICALL
Agent_OnAttach(JavaVM *jvm, char *options, void *reserved) {
return Agent_Initialize(jvm, options, reserved);
}
JNIEXPORT jint JNICALL
JNI_OnLoad(JavaVM *jvm, void *reserved) {
jint res;
JNIEnv *env;
res = JNI_ENV_PTR(jvm)->GetEnv(JNI_ENV_ARG(jvm, (void **) &env),
JNI_VERSION_9);
if (res != JNI_OK || env == NULL) {
fprintf(stderr, "Error: GetEnv call failed(%d)!\n", res);
return JNI_ERR;
}
return JNI_VERSION_9;
}
static
jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved) {
jint res;
jvmtiError err;
jvmtiCapabilities caps;
printf("Agent_OnLoad started\n");
memset(&caps, 0, sizeof(caps));
res = JNI_ENV_PTR(jvm)->GetEnv(JNI_ENV_ARG(jvm, (void **) &jvmti),
JVMTI_VERSION_9);
if (res != JNI_OK || jvmti == NULL) {
fprintf(stderr, "Error: wrong result of a valid call to GetEnv!\n");
return JNI_ERR;
}
caps.can_get_owned_monitor_stack_depth_info = 1;
err = (*jvmti)->AddCapabilities(jvmti, &caps);
if (err != JVMTI_ERROR_NONE) {
ShowErrorMessage(jvmti, err,
"Agent_OnLoad: error in JVMTI AddCapabilities");
return JNI_ERR;
}
err = (*jvmti)->GetCapabilities(jvmti, &caps);
if (err != JVMTI_ERROR_NONE) {
ShowErrorMessage(jvmti, err,
"Agent_OnLoad: error in JVMTI GetCapabilities");
return JNI_ERR;
}
if (!caps.can_get_owned_monitor_stack_depth_info) {
fprintf(stderr, "Warning: GetOwnedMonitorStackDepthInfo is not implemented\n");
return JNI_ERR;
}
printf("Agent_OnLoad finished\n");
return JNI_OK;
}
JNIEXPORT jint JNICALL
Java_GetOwnedMonitorStackDepthInfoWithEATest_getOwnedMonitorStackDepthInfo(JNIEnv *env, jclass cls, jobject targetThread, jobjectArray ownedMonitors, jintArray depths) {
jvmtiError err;
jvmtiThreadInfo threadInfo;
jint monitorCount;
jvmtiMonitorStackDepthInfo* stackDepthInfo;
jint* depthsPtr;
jint idx = 0;
err = (*jvmti)->GetThreadInfo(jvmti, targetThread, &threadInfo);
if (err != JVMTI_ERROR_NONE) {
ShowErrorMessage(jvmti, err,
"getOwnedMonitorsFor: error in JVMTI GetThreadInfo");
return FAILED;
}
err = (*jvmti)->GetOwnedMonitorStackDepthInfo(jvmti, targetThread, &monitorCount, &stackDepthInfo);
if (err != JVMTI_ERROR_NONE) {
ShowErrorMessage(jvmti, err,
"getOwnedMonitorsFor: error in JVMTI GetOwnedMonitorStackDepthInfo");
return FAILED;
}
printf("getOwnedMonitorsFor: %s owns %d monitor(s)\n", threadInfo.name, monitorCount);
depthsPtr = (*env)->GetIntArrayElements(env, depths, NULL);
for (idx = 0; idx < monitorCount; idx++) {
(*env)->SetObjectArrayElement(env, ownedMonitors, idx, stackDepthInfo[idx].monitor);
depthsPtr[idx] = stackDepthInfo[idx].stack_depth;
}
(*env)->ReleaseIntArrayElements(env, depths, depthsPtr, 0);
(*jvmti)->Deallocate(jvmti, (unsigned char *) stackDepthInfo);
(*jvmti)->Deallocate(jvmti, (unsigned char *) threadInfo.name);
return monitorCount;
}
#ifdef __cplusplus
}
#endif
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