/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package dalvik.system;
import android.system.ErrnoException;
import android.system.StructStat;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Enumeration;
import java.util.List;
import libcore.io.Libcore;
/**
* Loads DEX files. This class is meant for internal use and should not be used
* by applications.
*
* @deprecated This class should not be used directly by applications. It will hurt
* performance in most cases and will lead to incorrect execution of bytecode in
* the worst case. Applications should use one of the standard classloaders such
* as {@link dalvik.system.PathClassLoader} instead. <b>This API will be removed
* in a future Android release</b>.
*/
@Deprecated
public final class DexFile {
/**
* If close is called, mCookie becomes null but the internal cookie is preserved if the close
* failed so that we can free resources in the finalizer.
*/
private Object mCookie;
private Object mInternalCookie;
private final String mFileName;
/**
* Opens a DEX file from a given File object.
*
* @deprecated Applications should use one of the standard classloaders such
* as {@link dalvik.system.PathClassLoader} instead. <b>This API will be removed
* in a future Android release</b>.
*/
@Deprecated
public DexFile(File file) throws IOException {
this(file.getPath());
}
/*
* Private version with class loader argument.
*
* @param file
* the File object referencing the actual DEX file
* @param loader
* the class loader object creating the DEX file object
* @param elements
* the temporary dex path list elements from DexPathList.makeElements
*/
DexFile(File file, ClassLoader loader, DexPathList.Element[] elements)
throws IOException {
this(file.getPath(), loader, elements);
}
/**
* Opens a DEX file from a given filename.
*
* @deprecated Applications should use one of the standard classloaders such
* as {@link dalvik.system.PathClassLoader} instead. <b>This API will be removed
* in a future Android release</b>.
*/
@Deprecated
public DexFile(String fileName) throws IOException {
this(fileName, null, null);
}
/*
* Private version with class loader argument.
*
* @param fileName
* the filename of the DEX file
* @param loader
* the class loader creating the DEX file object
* @param elements
* the temporary dex path list elements from DexPathList.makeElements
*/
DexFile(String fileName, ClassLoader loader, DexPathList.Element[] elements) throws IOException {
mCookie = openDexFile(fileName, null, 0, loader, elements);
mInternalCookie = mCookie;
mFileName = fileName;
//System.out.println("DEX FILE cookie is " + mCookie + " fileName=" + fileName);
}
DexFile(ByteBuffer buf) throws IOException {
mCookie = openInMemoryDexFile(buf);
mInternalCookie = mCookie;
mFileName = null;
}
/**
* Opens a DEX file from a given filename, using a specified file
* to hold the optimized data.
*
* @param sourceName
* Jar or APK file with "classes.dex".
* @param outputName
* File that will hold the optimized form of the DEX data.
* @param flags
* Enable optional features.
* @param loader
* The class loader creating the DEX file object.
* @param elements
* The temporary dex path list elements from DexPathList.makeElements
*/
private DexFile(String sourceName, String outputName, int flags, ClassLoader loader,
DexPathList.Element[] elements) throws IOException {
if (outputName != null) {
try {
String parent = new File(outputName).getParent();
if (Libcore.os.getuid() != Libcore.os.stat(parent).st_uid) {
throw new IllegalArgumentException("Optimized data directory " + parent
+ " is not owned by the current user. Shared storage cannot protect"
+ " your application from code injection attacks.");
}
} catch (ErrnoException ignored) {
// assume we'll fail with a more contextual error later
}
}
mCookie = openDexFile(sourceName, outputName, flags, loader, elements);
mInternalCookie = mCookie;
mFileName = sourceName;
//System.out.println("DEX FILE cookie is " + mCookie + " sourceName=" + sourceName + " outputName=" + outputName);
}
/**
* Open a DEX file, specifying the file in which the optimized DEX
* data should be written. If the optimized form exists and appears
* to be current, it will be used; if not, the VM will attempt to
* regenerate it.
*
* @deprecated Applications should use one of the standard classloaders such
* as {@link dalvik.system.PathClassLoader} instead. <b>This API will be removed
* in a future Android release</b>.
*/
@Deprecated
static public DexFile loadDex(String sourcePathName, String outputPathName,
int flags) throws IOException {
/*
* TODO: we may want to cache previously-opened DexFile objects.
* The cache would be synchronized with close(). This would help
* us avoid mapping the same DEX more than once when an app
* decided to open it multiple times. In practice this may not
* be a real issue.
*/
return loadDex(sourcePathName, outputPathName, flags, null, null);
}
/*
* Private version of loadDex that also takes a class loader.
*
* @param sourcePathName
* Jar or APK file with "classes.dex". (May expand this to include
* "raw DEX" in the future.)
* @param outputPathName
* File that will hold the optimized form of the DEX data.
* @param flags
* Enable optional features. (Currently none defined.)
* @param loader
* Class loader that is aloading the DEX file.
* @param elements
* The temporary dex path list elements from DexPathList.makeElements
* @return
* A new or previously-opened DexFile.
* @throws IOException
* If unable to open the source or output file.
*/
static DexFile loadDex(String sourcePathName, String outputPathName,
int flags, ClassLoader loader, DexPathList.Element[] elements) throws IOException {
/*
* TODO: we may want to cache previously-opened DexFile objects.
* The cache would be synchronized with close(). This would help
* us avoid mapping the same DEX more than once when an app
* decided to open it multiple times. In practice this may not
* be a real issue.
*/
return new DexFile(sourcePathName, outputPathName, flags, loader, elements);
}
/**
* Gets the name of the (already opened) DEX file.
*
* @return the file name
*/
public String getName() {
return mFileName;
}
@Override public String toString() {
if (mFileName != null) {
return getName();
} else {
return "InMemoryDexFile[cookie=" + Arrays.toString((long[]) mCookie) + "]";
}
}
/**
* Closes the DEX file.
* <p>
* This may not be able to release all of the resources. If classes from this DEX file are
* still resident, the DEX file can't be unmapped. In the case where we do not release all
* the resources, close is called again in the finalizer.
*
* @throws IOException
* if an I/O error occurs during closing the file, which
* normally should not happen
*/
public void close() throws IOException {
if (mInternalCookie != null) {
if (closeDexFile(mInternalCookie)) {
mInternalCookie = null;
}
mCookie = null;
}
}
/**
* Loads a class. Returns the class on success, or a {@code null} reference
* on failure.
* <p>
* If you are not calling this from a class loader, this is most likely not
* going to do what you want. Use {@link Class#forName(String)} instead.
* <p>
* The method does not throw {@link ClassNotFoundException} if the class
* isn't found because it isn't reasonable to throw exceptions wildly every
* time a class is not found in the first DEX file we look at.
*
* @param name
* the class name, which should look like "java/lang/String"
*
* @param loader
* the class loader that tries to load the class (in most cases
* the caller of the method
*
* @return the {@link Class} object representing the class, or {@code null}
* if the class cannot be loaded
*/
public Class loadClass(String name, ClassLoader loader) {
String slashName = name.replace('.', '/');
return loadClassBinaryName(slashName, loader, null);
}
/**
* See {@link #loadClass(String, ClassLoader)}.
*
* This takes a "binary" class name to better match ClassLoader semantics.
*
* @hide
*/
public Class loadClassBinaryName(String name, ClassLoader loader, List<Throwable> suppressed) {
return defineClass(name, loader, mCookie, this, suppressed);
}
private static Class defineClass(String name, ClassLoader loader, Object cookie,
DexFile dexFile, List<Throwable> suppressed) {
Class result = null;
try {
result = defineClassNative(name, loader, cookie, dexFile);
} catch (NoClassDefFoundError e) {
if (suppressed != null) {
suppressed.add(e);
}
} catch (ClassNotFoundException e) {
if (suppressed != null) {
suppressed.add(e);
}
}
return result;
}
/**
* Enumerate the names of the classes in this DEX file.
*
* @return an enumeration of names of classes contained in the DEX file, in
* the usual internal form (like "java/lang/String").
*/
public Enumeration<String> entries() {
return new DFEnum(this);
}
/*
* Helper class.
*/
private static class DFEnum implements Enumeration<String> {
private int mIndex;
private String[] mNameList;
DFEnum(DexFile df) {
mIndex = 0;
mNameList = getClassNameList(df.mCookie);
}
public boolean hasMoreElements() {
return (mIndex < mNameList.length);
}
public String nextElement() {
return mNameList[mIndex++];
}
}
/**
* Called when the class is finalized. Makes sure the DEX file is closed.
*
* @throws IOException
* if an I/O error occurs during closing the file, which
* normally should not happen
*/
@Override protected void finalize() throws Throwable {
try {
if (mInternalCookie != null && !closeDexFile(mInternalCookie)) {
throw new AssertionError("Failed to close dex file in finalizer.");
}
mInternalCookie = null;
mCookie = null;
} finally {
super.finalize();
}
}
/*
* Open a DEX file. The value returned is a magic VM cookie. On
* failure, an IOException is thrown.
*/
private static Object openDexFile(String sourceName, String outputName, int flags,
ClassLoader loader, DexPathList.Element[] elements) throws IOException {
// Use absolute paths to enable the use of relative paths when testing on host.
return openDexFileNative(new File(sourceName).getAbsolutePath(),
(outputName == null)
? null
: new File(outputName).getAbsolutePath(),
flags,
loader,
elements);
}
private static Object openInMemoryDexFile(ByteBuffer buf) throws IOException {
if (buf.isDirect()) {
return createCookieWithDirectBuffer(buf, buf.position(), buf.limit());
} else {
return createCookieWithArray(buf.array(), buf.position(), buf.limit());
}
}
private static native Object createCookieWithDirectBuffer(ByteBuffer buf, int start, int end);
private static native Object createCookieWithArray(byte[] buf, int start, int end);
/*
* Returns true if the dex file is backed by a valid oat file.
*/
/*package*/ boolean isBackedByOatFile() {
return isBackedByOatFile(mCookie);
}
/*
* Returns true if we managed to close the dex file.
*/
private static native boolean closeDexFile(Object cookie);
private static native Class defineClassNative(String name, ClassLoader loader, Object cookie,
DexFile dexFile)
throws ClassNotFoundException, NoClassDefFoundError;
private static native String[] getClassNameList(Object cookie);
private static native boolean isBackedByOatFile(Object cookie);
/*
* Open a DEX file. The value returned is a magic VM cookie. On
* failure, an IOException is thrown.
*/
private static native Object openDexFileNative(String sourceName, String outputName, int flags,
ClassLoader loader, DexPathList.Element[] elements);
/**
* Returns true if the VM believes that the apk/jar file is out of date
* and should be passed through "dexopt" again.
*
* @param fileName the absolute path to the apk/jar file to examine.
* @return true if dexopt should be called on the file, false otherwise.
* @throws java.io.FileNotFoundException if fileName is not readable,
* not a file, or not present.
* @throws java.io.IOException if fileName is not a valid apk/jar file or
* if problems occur while parsing it.
* @throws java.lang.NullPointerException if fileName is null.
*/
public static native boolean isDexOptNeeded(String fileName)
throws FileNotFoundException, IOException;
/**
* No dexopt should (or can) be done to update the apk/jar.
*
* See {@link #getDexOptNeeded(String, String, int)}.
*
* @hide
*/
public static final int NO_DEXOPT_NEEDED = 0;
/**
* dex2oat should be run to update the apk/jar from scratch.
*
* See {@link #getDexOptNeeded(String, String, int)}.
*
* @hide
*/
public static final int DEX2OAT_FROM_SCRATCH = 1;
/**
* dex2oat should be run to update the apk/jar because the existing code
* is out of date with respect to the boot image.
*
* See {@link #getDexOptNeeded(String, String, int)}.
*
* @hide
*/
public static final int DEX2OAT_FOR_BOOT_IMAGE = 2;
/**
* dex2oat should be run to update the apk/jar because the existing code
* is out of date with respect to the target compiler filter.
*
* See {@link #getDexOptNeeded(String, String, int)}.
*
* @hide
*/
public static final int DEX2OAT_FOR_FILTER = 3;
/**
* dex2oat should be run to update the apk/jar because the existing code
* is not relocated to match the boot image.
*
* See {@link #getDexOptNeeded(String, String, int)}.
*
* @hide
*/
public static final int DEX2OAT_FOR_RELOCATION = 4;
/**
* Returns the VM's opinion of what kind of dexopt is needed to make the
* apk/jar file up to date, where {@code targetMode} is used to indicate what
* type of compilation the caller considers up-to-date, and {@code newProfile}
* is used to indicate whether profile information has changed recently.
*
* @param fileName the absolute path to the apk/jar file to examine.
* @param compilerFilter a compiler filter to use for what a caller considers up-to-date.
* @param newProfile flag that describes whether a profile corresponding
* to the dex file has been recently updated and should be considered
* in the state of the file.
* @return NO_DEXOPT_NEEDED, or DEX2OAT_*. See documentation
* of the particular status code for more information on its
* meaning. Returns a positive status code if the status refers to
* the oat file in the oat location. Returns a negative status
* code if the status refers to the oat file in the odex location.
* @throws java.io.FileNotFoundException if fileName is not readable,
* not a file, or not present.
* @throws java.io.IOException if fileName is not a valid apk/jar file or
* if problems occur while parsing it.
* @throws java.lang.NullPointerException if fileName is null.
*
* @hide
*/
public static native int getDexOptNeeded(String fileName,
String instructionSet, String compilerFilter, boolean newProfile)
throws FileNotFoundException, IOException;
/**
* Returns the status of the dex file {@code fileName}. The returned string is
* an opaque, human readable representation of the current status. The output
* is only meant for debugging and is not guaranteed to be stable across
* releases and/or devices.
*
* @hide
*/
public static native String getDexFileStatus(String fileName, String instructionSet)
throws FileNotFoundException;
/**
* Returns the paths of the optimized files generated for {@code fileName}.
* If no optimized code exists the method returns null.
* @hide
*/
public static native String[] getDexFileOutputPaths(String fileName, String instructionSet)
throws FileNotFoundException;
/**
* Returns whether the given filter is a valid filter.
*
* @hide
*/
public native static boolean isValidCompilerFilter(String filter);
/**
* Returns whether the given filter is based on profiles.
*
* @hide
*/
public native static boolean isProfileGuidedCompilerFilter(String filter);
/**
* Returns the version of the compiler filter that is not based on profiles.
* If the input is not a valid filter, or the filter is already not based on
* profiles, this returns the input.
*
* @hide
*/
public native static String getNonProfileGuidedCompilerFilter(String filter);
/**
* Returns the version of the compiler filter that is suitable for safe mode.
* If the input is not a valid filter, or the filter is already suitable for
* safe mode, this returns the input.
*
* @hide
*/
public native static String getSafeModeCompilerFilter(String filter);
}