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/*
* Copyright (c) 2022, 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 <stdio.h>
#include "jvmti.h"
#define TARGET_CLASS_NAME "LTarget;"
static jvmtiEnv *jvmti = nullptr;
static void
check_jvmti_status(JNIEnv* jni, jvmtiError err, const char* msg) {
if (err != JVMTI_ERROR_NONE) {
printf("check_jvmti_status: %s, JVMTI function returned error: %d\n", msg, err);
jni->FatalError(msg);
}
}
void JNICALL classprepare(jvmtiEnv* jvmti_env, JNIEnv* jni_env, jthread thread, jclass klass) {
char* buf;
jvmtiError err;
err = jvmti->GetClassSignature(klass, &buf, nullptr);
check_jvmti_status(jni_env, err, "classprepare: GetClassSignature error");
if (strncmp(buf, TARGET_CLASS_NAME, strlen(TARGET_CLASS_NAME)) == 0) {
jint nMethods;
jmethodID* methods;
int i;
err = jvmti->GetClassMethods(klass, &nMethods, &methods);
check_jvmti_status(jni_env, err, "classprepare: GetClassMethods error");
printf("Setting breakpoints in %s\n", buf);
fflush(stdout);
for (i = 0; i < nMethods; i++) {
err = jvmti->SetBreakpoint(methods[i], 0);
check_jvmti_status(jni_env, err, "classprepare: SetBreakpoint error");
}
}
}
void JNICALL breakpoint(jvmtiEnv* jvmti_env, JNIEnv* jni_env, jthread thread, jmethodID method, jlocation location) {
// Do nothing
}
JNIEXPORT jint JNICALL Agent_OnLoad(JavaVM* vm, char* options, void* reserved) {
jvmtiCapabilities capa;
jvmtiEventCallbacks cbs;
jint err;
err = vm->GetEnv((void**)&jvmti, JVMTI_VERSION_1_0);
if (err != JNI_OK) {
printf("Agent_OnLoad: GetEnv error\n");
return JNI_ERR;
}
memset(&capa, 0, sizeof(capa));
capa.can_generate_breakpoint_events = 1;
capa.can_generate_single_step_events = 1;
err = jvmti->AddCapabilities(&capa);
if (err != JNI_OK) {
printf("Agent_OnLoad: AddCapabilities error\n");
return JNI_ERR;
}
memset(&cbs, 0, sizeof(cbs));
cbs.ClassPrepare = classprepare;
cbs.Breakpoint = breakpoint;
err = jvmti->SetEventCallbacks(&cbs, sizeof(cbs));
if (err != JNI_OK) {
printf("Agent_OnLoad: SetEventCallbacks error\n");
return JNI_ERR;
}
err = jvmti->SetEventNotificationMode(JVMTI_ENABLE, JVMTI_EVENT_CLASS_PREPARE, nullptr);
if (err != JNI_OK) {
printf("Agent_OnLoad: SetEventNotificationMode CLASS_PREPARE error\n");
return JNI_ERR;
}
err = jvmti->SetEventNotificationMode(JVMTI_ENABLE, JVMTI_EVENT_BREAKPOINT, nullptr);
if (err != JNI_OK) {
printf("Agent_OnLoad: SetEventNotificationMode BREAKPOINT error\n");
return JNI_ERR;
}
return JNI_OK;
}
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