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/*
* Copyright (c) 2018, 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 <stdio.h>
#include <string.h>
#include "jvmti.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
static jvmtiEnv *jvmti = NULL;
static jvmtiCapabilities caps;
static jvmtiEventCallbacks callbacks;
static jboolean framePopReceived = JNI_FALSE;
static jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved);
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) {
return JNI_VERSION_9;
}
static void reportError(const char *msg, int err) {
fprintf(stdout, "%s, error: %d\n", msg, err);
fflush(stdout);
}
static void JNICALL
FramePop(jvmtiEnv *jvmti_env, JNIEnv *env, jthread thread,
jmethodID method, jboolean wasPoppedByException)
{
jvmtiError err;
jclass cls = NULL;
char* csig = NULL;
char* name = NULL;
char* sign = NULL;
framePopReceived = JNI_TRUE;
err = (*jvmti_env)->GetMethodDeclaringClass(jvmti_env, method, &cls);
if (err != JVMTI_ERROR_NONE) {
reportError("FramePop: GetMethodDeclaringClass failed", err);
}
err = (*jvmti_env)->GetClassSignature(jvmti_env, cls, &csig, NULL);
if (err != JVMTI_ERROR_NONE) {
reportError("FramePop: GetClassSignature failed", err);
}
err = (*jvmti_env)->GetMethodName(jvmti_env, method, &name, &sign, NULL);
if (err != JVMTI_ERROR_NONE) {
reportError("FramePop: GetMethodName failed", err);
}
fprintf(stdout, "FramePop event from method: %s %s%s\n", csig, name, sign);
fflush(stdout);
(*jvmti_env)->Deallocate(jvmti_env, (unsigned char*)csig);
(*jvmti_env)->Deallocate(jvmti_env, (unsigned char*)name);
(*jvmti_env)->Deallocate(jvmti_env, (unsigned char*)sign);
}
static
jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved) {
jint res;
jvmtiError err;
res = JNI_ENV_PTR(jvm)->GetEnv(JNI_ENV_ARG(jvm, (void **) &jvmti), JVMTI_VERSION_9);
if (res != JNI_OK || jvmti == NULL) {
reportError("GetEnv(JVMTI_VERSION_9) failed", res);
return JNI_ERR;
}
err = (*jvmti)->GetPotentialCapabilities(jvmti, &caps);
if (err != JVMTI_ERROR_NONE) {
reportError("GetPotentialCapabilities failed", err);
return JNI_ERR;
}
err = (*jvmti)->AddCapabilities(jvmti, &caps);
if (err != JVMTI_ERROR_NONE) {
reportError("AddCapabilities failed",err);
return JNI_ERR;
}
err = (*jvmti)->GetCapabilities(jvmti, &caps);
if (err != JVMTI_ERROR_NONE) {
reportError("GetCapabilities failed", err);
return JNI_ERR;
}
if (caps.can_generate_frame_pop_events) {
callbacks.FramePop = &FramePop;
err = (*jvmti)->SetEventCallbacks(jvmti, &callbacks, sizeof(callbacks));
if (err != JVMTI_ERROR_NONE) {
reportError("SetEventCallbacks failed", err);
return JNI_ERR;
}
}
return JNI_OK;
}
JNIEXPORT jboolean JNICALL
Java_NotifyFramePopTest_canGenerateFramePopEvents(JNIEnv *env, jclass cls) {
return caps.can_generate_frame_pop_events ? JNI_TRUE : JNI_FALSE;
}
JNIEXPORT void JNICALL
Java_NotifyFramePopTest_setFramePopNotificationMode(JNIEnv *env, jclass cl, jboolean enable) {
jvmtiEventMode mode = enable ? JVMTI_ENABLE : JVMTI_DISABLE;
jvmtiError err = (*jvmti)->SetEventNotificationMode(jvmti, mode, JVMTI_EVENT_FRAME_POP, NULL);
if (err != JVMTI_ERROR_NONE) {
reportError("Failed to set notification mode for FRAME_POP events", err);
}
}
JNIEXPORT void JNICALL
Java_NotifyFramePopTest_notifyFramePop(JNIEnv *env, jclass cls, jthread thread)
{
jvmtiError err= (*jvmti)->NotifyFramePop(jvmti, thread, 1);
if (err != JVMTI_ERROR_NONE) {
reportError("NotifyFramePop failed", err);
}
}
JNIEXPORT jboolean JNICALL
Java_NotifyFramePopTest_framePopReceived(JNIEnv *env, jclass cls) {
jboolean result = framePopReceived;
framePopReceived = JNI_FALSE;
return result;
}
#ifdef __cplusplus
}
#endif
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