112 lines
3.6 KiB
C++
112 lines
3.6 KiB
C++
/*
|
|
* 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;
|
|
}
|