org.evosuite.runtime.System Maven / Gradle / Ivy
/**
* Copyright (C) 2010-2017 Gordon Fraser, Andrea Arcuri and EvoSuite
* contributors
*
* This file is part of EvoSuite.
*
* EvoSuite is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation, either version 3.0 of the License, or
* (at your option) any later version.
*
* EvoSuite 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
* Lesser Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with EvoSuite. If not, see
* System class.
*
*
* @author fraser
*/
public class System {
private static final Logger logger = LoggerFactory.getLogger(System.class);
private static boolean wasTimeAccessed = false;
/**
* Default Java properties before we run the SUT
*/
private static final java.util.Properties defaultProperties;
private static final Set systemProperties;
static {
java.util.Properties prop = null;
try{
prop = (java.util.Properties) java.lang.System.getProperties().clone();
} catch(Exception e){
logger.error("Error while initializing System: "+e.getMessage());
}
defaultProperties = prop;
systemProperties = new HashSet(Arrays.asList(new String[]{"java.version", "java.vendor", "java.vendor.url", "java.home", "java.vm.specification.version", "java.vm.specification.vendor",
"java.vm.specification.name", "java.vm.version", "java.vm.vendor", "java.vm.name", "java.specification.version", "java.specification.vendor",
"java.specification.name", "java.class.version", "java.class.path", "java.library.path", "java.io.tmpdir", "java.compiler", "java.ext.dirs",
"os.name", "os.arch", "os.version", "file.separator", "path.separator", "line.separator", "user.name", "user.home", "user.dir", "java.endorsed.dirs",
"awt.toolkit", "java.awt.graphicsenv", "java.awt.printerjob", "java.vm.info", "java.runtime.version", "java.runtime.name"}));
}
/**
* If SUT changed some properties, we need to re-set the default values
*/
private static volatile boolean needToRestoreProperties;
/**
* Keep track of which System properties were read
*/
private static final Set readProperties = new LinkedHashSet();
/**
* Restore to their original values all the properties that have
* been modified during test execution
*/
public static void restoreProperties(){
/*
* The synchronization is used to avoid (if possible) a SUT thread to modify a property just immediately after we restore them. this could
* actually happen if this method is called while a SUT thread is executing a permission check
*/
synchronized (defaultProperties) {
if (needToRestoreProperties) {
java.lang.System.setProperties((java.util.Properties) defaultProperties.clone());
needToRestoreProperties = false;
}
}
}
public static boolean wasAnyPropertyWritten(){
return needToRestoreProperties;
}
public static boolean isSystemProperty(String property) {
return systemProperties.contains(property);
}
public static boolean handlePropertyPermission(PropertyPermission perm){
/*
* we allow both writing and reading any properties. But, if SUT writes anything, then we need to re-store the values to their default. this
* is very important, otherwise: 1) test cases might have side effects on each other 2) SUT might change properties that are used by EvoSuite
*/
if(readProperties == null){
/*
* this can happen when readProperties is initialized in the static body
* and security manager is on
*/
return true;
}
if (perm.getActions().contains("write")) {
if(!RuntimeSettings.mockJVMNonDeterminism) {
if(isSystemProperty(perm.getName())) {
// We cannot restore these properties to ensure cross-OS compatibility, so they can't be written to
return false;
} else {
return true;
}
} else {
// As we do not restore these properties to ensure cross-OS compatibility they should not be written to
// ...but that would break compatibility with exiting test sets, so ignoring it for now.
// This risks potentially unstable tests.
//
// if(isSystemProperty(perm.getName())) {
// return false;
// }
}
synchronized (defaultProperties) {
needToRestoreProperties = true;
}
} else {
String var = perm.getName();
// We cannot restore these properties to ensure cross-OS compatibility, so they can't be written to
if(!isSystemProperty(var)) {
synchronized (readProperties) {
readProperties.add(var);
}
}
}
return true;
}
public static Set getAllPropertiesReadSoFar(){
Set copy = new LinkedHashSet();
synchronized (readProperties) {
copy.addAll(readProperties);
}
return copy;
}
/**
*
* This exception tells the test execution that it should stop at this point
*
*
*
* Note that it extends {@code Error}, as we need something that is
* unchecked
*
*/
public static class SystemExitException extends Error {
private static final long serialVersionUID = 1L;
}
/**
* Replacement function for System.exit
*
* @param status
* a int.
*/
public static void exit(int status) {
wasTimeAccessed = true;
/*
* TODO: Here we could handle the calls to the JVM shutdown hooks, if any is present
*/
throw new SystemExitException();
}
/** Current time returns numbers increased by 1 */
// Initialised to 2014-02-14, 20:21
private static long currentTime = 1392409281320L;
/**
* Replacement function for System.currentTimeMillis
*
* @return a long.
*/
public static long currentTimeMillis() {
wasTimeAccessed = true;
return currentTime; //++;
}
/**
* Get time without modifying whether the time was accessed.
* This is important as otherwise the use of VFS would always
* mark the time as accessed
*
* @return
*/
public static long getCurrentTimeMillisForVFS() {
//wasTimeAccessed = true;
return currentTime; //++;
}
private static final Map hashKeys = new HashMap();
public static void registerObjectForIdentityHashCode(Object o) {
identityHashCode(o);
}
public static int identityHashCode(Object o) {
if(o == null)
return 0;
synchronized (hashKeys) {
Integer realId = java.lang.System.identityHashCode(o);
if(!hashKeys.containsKey(realId))
hashKeys.put(realId, hashKeys.size() + 1);
return hashKeys.get(realId);
}
}
public static String toString(Object o) {
if(o == null)
throw new NullPointerException();
return o.getClass().getName() + "@" + String.format("%010d", identityHashCode(o));
}
/**
* Replacement function for System.currentTimeMillis
*
* @return a long.
*/
public static long nanoTime() {
wasTimeAccessed = true;
return currentTime * 1000; //++;
}
/**
* Replacement function for for Runtime.freeMemory()
* @return
*/
public static long freeMemory() {
return 0L;
}
/**
* Replacement function for for Runtime.maxMemory()
* @return
*/
public static long maxMemory() {
return 0L;
}
/**
* Replacement function for for Runtime.totalMemory()
* @return
*/
public static long totalMemory() {
return 0L;
}
/**
* Replacement function for for Runtime.availableProcessors()
* @return
*/
public static int availableProcessors() {
return 0;
}
/**
* Allow setting the time
*
* @param time
* a long.
*/
public static void setCurrentTimeMillis(long time) {
currentTime = time;
}
/**
* TODO: Reflection and class initialisation may cause setSecurityManager to be called by the SUT.
* Until this is resolved, we avoid this using instrumentation
* @param manager
*/
public static void setSecurityManager(SecurityManager manager) {
throw new SecurityException("Permission Denied");
}
/**
* Reset runtime to initial state
*/
public static void resetRuntime() {
currentTime = 1392409281320L; // 2014-02-14, 20:21
wasTimeAccessed = false;
hashKeys.clear();
restoreProperties();
needToRestoreProperties = false;
//readProperties.clear(); //we cannot reset read properties here
}
/**
* Fully reset the state, not only the one related to
* latest test case execution
*/
public static void fullReset(){
resetRuntime();
/*
* System properties have to be treated very specially because
* we want to keep track of them when they are accessed in
* static blocks, and also from non-instrumented classes
*/
synchronized (readProperties) {
readProperties.clear();
}
}
/**
* Getter to check whether the runtime replacement for time was accessed during test
* execution
*
* @return a boolean.
*/
public static boolean wasTimeAccessed() {
return wasTimeAccessed;
}
}