/*
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* Copyright (c) 1999, 2017, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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#include <stdatomic.h>
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#include "vmDebug.h"
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#include "JDWP.h"
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#include "debugLoop.h"
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#include "transport.h"
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#include "util.h"
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static _Atomic(jlong) lastDebuggerActivity = ATOMIC_VAR_INIT(0LL);
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static _Atomic(jboolean) hasSeenDebuggerActivity = ATOMIC_VAR_INIT(JNI_FALSE);
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// Reset the tracking variables.
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void vmDebug_onDisconnect()
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{
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atomic_store(&lastDebuggerActivity, 0LL);
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atomic_store(&hasSeenDebuggerActivity, JNI_FALSE);
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}
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// Mark us as having seen actual debugger activity (so isDebuggerConnected can return true) and that
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// we are currently doing something as the debugger.
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void vmDebug_notifyDebuggerActivityStart()
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{
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atomic_store(&lastDebuggerActivity, 0LL);
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atomic_store(&hasSeenDebuggerActivity, JNI_TRUE);
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}
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// Update the timestamp for the last debugger activity.
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void vmDebug_notifyDebuggerActivityEnd()
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{
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atomic_store(&lastDebuggerActivity, milliTime());
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}
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// For backwards compatibility we are only considered 'connected' as far as VMDebug is concerned if
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// we have gotten at least one non-ddms JDWP packet.
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static jboolean
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isDebuggerConnected()
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{
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return transport_is_open() && atomic_load(&hasSeenDebuggerActivity);
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}
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static jboolean JNICALL
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VMDebug_isDebuggerConnected(JNIEnv* env, jclass klass)
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{
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return isDebuggerConnected();
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}
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static jboolean JNICALL
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VMDebug_isDebuggingEnabled(JNIEnv* env, jclass klass)
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{
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// We are running the debugger so debugging is definitely enabled.
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return JNI_TRUE;
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}
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static jlong JNICALL
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VMDebug_lastDebuggerActivity(JNIEnv* env, jclass klass)
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{
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if (!isDebuggerConnected()) {
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LOG_ERROR(("VMDebug.lastDebuggerActivity called without active debugger"));
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return -1;
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}
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jlong last_time = atomic_load(&lastDebuggerActivity);
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if (last_time == 0) {
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LOG_MISC(("debugger is performing an action"));
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return 0;
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}
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jlong cur_time = milliTime();
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if (cur_time < last_time) {
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LOG_ERROR(("Time seemed to go backwards: last was %lld, current is %lld",
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last_time, cur_time));
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return 0;
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}
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jlong res = cur_time - last_time;
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LOG_MISC(("Debugger interval is %lld", res));
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return res;
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}
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void
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vmDebug_initalize(JNIEnv* env)
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{
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WITH_LOCAL_REFS(env, 1) {
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jclass vmdebug_class = JNI_FUNC_PTR(env,FindClass)(env, "dalvik/system/VMDebug");
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if (vmdebug_class == NULL) {
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// The VMDebug class isn't available. We don't need to do anything.
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LOG_MISC(("dalvik.system.VMDebug does not seem to be available on this runtime."));
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// Get rid of the ClassNotFoundException.
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JNI_FUNC_PTR(env,ExceptionClear)(env);
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goto finish;
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}
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JNINativeMethod methods[3];
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// Take over the implementation of these three functions.
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methods[0].name = "lastDebuggerActivity";
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methods[0].signature = "()J";
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methods[0].fnPtr = (void*)VMDebug_lastDebuggerActivity;
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methods[1].name = "isDebuggingEnabled";
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methods[1].signature = "()Z";
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methods[1].fnPtr = (void*)VMDebug_isDebuggingEnabled;
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methods[2].name = "isDebuggerConnected";
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methods[2].signature = "()Z";
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methods[2].fnPtr = (void*)VMDebug_isDebuggerConnected;
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jint res = JNI_FUNC_PTR(env,RegisterNatives)(env,
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vmdebug_class,
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methods,
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sizeof(methods) / sizeof(JNINativeMethod));
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if (res != JNI_OK) {
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EXIT_ERROR(JVMTI_ERROR_INTERNAL,
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"RegisterNatives returned failure for VMDebug class");
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}
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finish: ;
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} END_WITH_LOCAL_REFS(env);
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}
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