test/hotspot/jtreg/vmTestbase/nsk/jvmti/scenarios/hotswap/HS202/hs202t001/hs202t001.cpp
/*
* Copyright (c) 2007, 2019, 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 <jni.h>
#include <jvmti.h>
#include "agent_common.h"
#include <string.h>
#include "jvmti_tools.h"
#include "JVMTITools.h"
/*
hs202t001:
1. Set breakpoints in several methods when Object.wait(),
Object.notify(), Object.notifyAll() are in use in these methods.
2. Upon reaching a breakpoint, enable SingleStep.
3. Redefine an java.lang.Object class within SingleStep callback
when one of its methods is called by the tested method.
4. Pop a currently executed frame.
*/
extern "C" {
#define FILE_NAME "nsk/jvmti/scenarios/hotswap/HS202/hs203t001/MyObject"
#define CLASS_NAME "Lnsk/jvmti/scenarios/hotswap/HS202/hs203t001/MyObject;"
#define METHOD_NAME "leaveMonitor"
#define METHOD_SIGN "()V"
#define METHOD_NOTIFYALL "notifyAll"
static jvmtiEnv * jvmti;
JNIEXPORT void JNICALL callbackClassPrepare(jvmtiEnv *jvmti,
JNIEnv* jni,
jthread thread,
jclass klass) {
char * className;
char * generic;
jvmti->GetClassSignature(klass, &className, &generic);
if (strcmp(className,CLASS_NAME) == 0) {
jmethodID method;
method = jni->GetMethodID(klass, METHOD_NAME, METHOD_SIGN);
if (method == NULL) {
nsk_printf("Agent:: Method is null ");
} else {
jlocation start;
jlocation end;
jvmtiError err ;
err=jvmti->GetMethodLocation(method, &start, &end);
if (err != JVMTI_ERROR_NONE) {
nsk_printf(" ## Error occured %s \n",TranslateError(err));
}else {
nsk_printf("\n Start = %d and end = %d ", start , end);
nsk_printf(" setting break points..");
err= jvmti->SetBreakpoint(method, start);
if (err != JVMTI_ERROR_NONE) {
nsk_printf(" ## Error occured %s \n",TranslateError(err));
} else {
nsk_printf(" NO ERRORS ");
if (nsk_jvmti_enableNotification(jvmti,JVMTI_EVENT_BREAKPOINT, NULL)) {
nsk_printf(" Enabled.. notification event ..\n");
}
}
}
}
}
}
/*
*This event call back will be called when a filed
*threadState is beeing upodated or beeing used in
*the program java flow.
*In this current example the code will be called
*/
void JNICALL callbackSingleStep(jvmtiEnv *jvmti_env,
JNIEnv* jni,
jthread thread,
jmethodID method,
jlocation location) {
jvmtiError err;
char * name;
char * signature;
char * generic ;
err = JVMTI_ERROR_NONE;
jvmti_env->GetMethodName(method, &name, &signature, &generic);
if (strcmp(name,METHOD_NAME) == 0) { /* same method */
jclass cls;
jmethodID mem ;
jvmti_env->GetMethodDeclaringClass(method, &cls);
mem=jni->GetMethodID(cls,METHOD_NOTIFYALL,"()V");
jni->CallVoidMethod(thread,mem);
}
}
void JNICALL callbackBreakpoint(jvmtiEnv *jvmti_env,
JNIEnv* jni_env,
jthread thread,
jmethodID method,
jlocation location) {
jvmtiError err;
err = JVMTI_ERROR_NONE;
if (nsk_jvmti_enableNotification(jvmti,JVMTI_EVENT_SINGLE_STEP, NULL)) {
nsk_printf(" Enabled.. notification event ..");
}
err= jvmti->SetEventNotificationMode(JVMTI_DISABLE,
JVMTI_EVENT_BREAKPOINT, NULL);
if (err == JVMTI_ERROR_NONE) {
nsk_printf(" Disabled notification..");
}
}
#ifdef STATIC_BUILD
JNIEXPORT jint JNICALL Agent_OnLoad_hs202t001(JavaVM *jvm, char *options, void *reserved) {
return Agent_Initialize(jvm, options, reserved);
}
JNIEXPORT jint JNICALL Agent_OnAttach_hs202t001(JavaVM *jvm, char *options, void *reserved) {
return Agent_Initialize(jvm, options, reserved);
}
JNIEXPORT jint JNI_OnLoad_hs202t001(JavaVM *jvm, char *options, void *reserved) {
return JNI_VERSION_1_8;
}
#endif
jint Agent_Initialize(JavaVM *vm, char *options, void *reserved) {
jvmtiError rc;
jint code;
nsk_printf("Agent:: VM.. Started..\n");
code = vm->GetEnv((void **)&jvmti, JVMTI_VERSION_1_1);
if (code != JNI_OK) {
nsk_printf("Agent:: Could not load JVMTI interface \n");
return JNI_ERR;
} else {
jvmtiCapabilities caps;
jvmtiEventCallbacks eventCallbacks;
memset(&caps, 0, sizeof(caps));
if (!nsk_jvmti_parseOptions(options)) {
nsk_printf("# error agent Failed to parse options \n");
return JNI_ERR;
}
caps.can_redefine_classes = 1;
caps.can_suspend = 1;
caps.can_pop_frame = 1;
caps.can_generate_all_class_hook_events = 1;
caps.can_generate_compiled_method_load_events = 1;
caps.can_generate_breakpoint_events=1;
caps.can_generate_single_step_events=1;
jvmti->AddCapabilities(&caps);
memset(&eventCallbacks, 0, sizeof(eventCallbacks));
eventCallbacks.ClassPrepare =callbackClassPrepare;
eventCallbacks.SingleStep =callbackSingleStep;
eventCallbacks.Breakpoint =callbackBreakpoint;
rc = jvmti->SetEventCallbacks(&eventCallbacks, sizeof(eventCallbacks));
if (rc != JVMTI_ERROR_NONE) {
nsk_printf(" ## Error occured %s \n",TranslateError(rc));
return JNI_ERR;
}
if (nsk_jvmti_enableNotification(jvmti,JVMTI_EVENT_CLASS_PREPARE, NULL)) {
nsk_printf("Agent :: NOTIFICATIONS ARE ENABLED \n");
} else {
nsk_printf(" Error in Eanableing Notifications..");
}
}
return JNI_OK;
}
JNIEXPORT jboolean JNICALL
Java_nsk_jvmti_scenarios_hotswap_HS202_hs202t001_hs202t001_popThreadFrame(JNIEnv * jni,
jclass clas,
jthread thread) {
jvmtiError err ;
jboolean retvalue;
jint state;
nsk_printf("Agent:: POPING THE FRAME....\n");
retvalue = JNI_FALSE;
jvmti->GetThreadState(thread, &state);
if (state & JVMTI_THREAD_STATE_SUSPENDED) {
err = jvmti->PopFrame(thread);
if (err == JVMTI_ERROR_NONE) {
nsk_printf("Agent:: NO Errors poped very well ..\n");
retvalue=JNI_OK;
return retvalue;
} else if (err != JVMTI_ERROR_NONE) {
nsk_printf(" ## Error occured %s \n",TranslateError(err));
}
nsk_printf("Agent:: some other error ..\n");
} else {
nsk_printf("Agent:: Thread was not suspened.. check for capabilities, and java method signature ");
}
return retvalue;
}
JNIEXPORT jboolean JNICALL
Java_nsk_jvmti_scenarios_hotswap_HS202_hs202t001_hs202t001_resumeThread(JNIEnv * jni,
jclass clas,
jthread thread) {
jvmtiError err ;
jboolean retvalue;
retvalue = JNI_FALSE;
err = jvmti->ResumeThread(thread);
if (err == JVMTI_ERROR_NONE) {
nsk_printf(" Agent:: Thread Resumed.. \n");
retvalue=JNI_OK;
} else {
nsk_printf(" Agent:: Failed.. to Resume the thread.\n");
}
return retvalue;
}
}