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/*
* Copyright (c) 1999, 2017, 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. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* 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 <stdatomic.h>
#include "vmDebug.h"
#include "JDWP.h"
#include "debugLoop.h"
#include "transport.h"
#include "util.h"
#include "eventHelper.h"
#include "threadControl.h"
static _Atomic(jlong) lastDebuggerActivity = ATOMIC_VAR_INIT(0LL);
static _Atomic(jboolean) hasSeenDebuggerActivity = ATOMIC_VAR_INIT(JNI_FALSE);
// Reset the tracking variables.
void vmDebug_onDisconnect()
{
atomic_store(&lastDebuggerActivity, 0LL);
atomic_store(&hasSeenDebuggerActivity, JNI_FALSE);
}
// Mark us as having seen actual debugger activity (so isDebuggerConnected can return true) and that
// we are currently doing something as the debugger.
void vmDebug_notifyDebuggerActivityStart()
{
atomic_store(&lastDebuggerActivity, 0LL);
atomic_store(&hasSeenDebuggerActivity, JNI_TRUE);
}
// Update the timestamp for the last debugger activity.
void vmDebug_notifyDebuggerActivityEnd()
{
atomic_store(&lastDebuggerActivity, milliTime());
}
// For backwards compatibility we are only considered 'connected' as far as VMDebug is concerned if
// we have gotten at least one non-ddms JDWP packet.
static jboolean
isDebuggerConnected()
{
return transport_is_open() && atomic_load(&hasSeenDebuggerActivity);
}
static jboolean JNICALL
VMDebug_isDebuggerConnected(JNIEnv* env, jclass klass)
{
return isDebuggerConnected();
}
static void JNICALL
VMDebug_suspendAllAndSendVmStart(JNIEnv* env, jclass klass)
{
jthread currentThread;
JVMTI_FUNC_PTR(gdata->jvmti, GetCurrentThread)(gdata->jvmti, ¤tThread);
eventHelper_reportVMInit(getEnv(), 0, currentThread, JDWP_SUSPEND_POLICY(ALL));
}
static jboolean JNICALL
VMDebug_isDebuggingEnabled(JNIEnv* env, jclass klass)
{
// We are running the debugger so debugging is definitely enabled.
return JNI_TRUE;
}
static jlong JNICALL
VMDebug_lastDebuggerActivity(JNIEnv* env, jclass klass)
{
if (!isDebuggerConnected()) {
LOG_ERROR(("VMDebug.lastDebuggerActivity called without active debugger"));
return -1;
}
jlong last_time = atomic_load(&lastDebuggerActivity);
if (last_time == 0) {
LOG_MISC(("debugger is performing an action"));
return 0;
}
jlong cur_time = milliTime();
if (cur_time < last_time) {
LOG_ERROR(("Time seemed to go backwards: last was %lld, current is %lld",
last_time, cur_time));
return 0;
}
jlong res = cur_time - last_time;
LOG_MISC(("Debugger interval is %lld", res));
return res;
}
void
vmDebug_initalize(JNIEnv* env)
{
WITH_LOCAL_REFS(env, 1) {
jclass vmdebug_class = JNI_FUNC_PTR(env,FindClass)(env, "dalvik/system/VMDebug");
if (vmdebug_class == NULL) {
// The VMDebug class isn't available. We don't need to do anything.
LOG_MISC(("dalvik.system.VMDebug does not seem to be available on this runtime."));
// Get rid of the ClassNotFoundException.
JNI_FUNC_PTR(env,ExceptionClear)(env);
goto finish;
}
JNINativeMethod methods[4];
// Take over the implementation of these functions.
methods[0].name = "lastDebuggerActivity";
methods[0].signature = "()J";
methods[0].fnPtr = (void*)VMDebug_lastDebuggerActivity;
methods[1].name = "isDebuggingEnabled";
methods[1].signature = "()Z";
methods[1].fnPtr = (void*)VMDebug_isDebuggingEnabled;
methods[2].name = "isDebuggerConnected";
methods[2].signature = "()Z";
methods[2].fnPtr = (void*)VMDebug_isDebuggerConnected;
methods[3].name = "suspendAllAndSendVmStart";
methods[3].signature = "()V";
methods[3].fnPtr = (void*)VMDebug_suspendAllAndSendVmStart;
jint res = JNI_FUNC_PTR(env,RegisterNatives)(env,
vmdebug_class,
methods,
sizeof(methods) / sizeof(JNINativeMethod));
if (res != JNI_OK) {
EXIT_ERROR(JVMTI_ERROR_INTERNAL,
"RegisterNatives returned failure for VMDebug class");
}
finish: ;
} END_WITH_LOCAL_REFS(env);
}
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