/**
* Chain together a ClassReader than will read the given class and a ClassWriter to write out a
* new class with an adapter in the middle to add annotations
*
* @param fromName the name of the class we're coming from
*/
private static void adaptClass(String fromName) {
if (VERBOSE) System.out.println("Adding annotations to class: " + fromName);
// gets an input stream to read the bytecode of the class
String resource = fromName.replace('.', '/') + ".class";
InputStream is = BootstrapClassLoader.getBootstrapClassLoader().getResourceAsStream(resource);
byte[] b;
// adapts the class on the fly
try {
ClassReader cr = new ClassReader(is);
ClassWriter cw = new ClassWriter(0);
ClassVisitor cv = new AddAnnotationClassAdapter(cw, fromName);
cr.accept(cv, 0);
b = cw.toByteArray();
} catch (Exception e) {
throw new Error("Couldn't find class " + fromName + " (" + resource + ")", e);
}
// store the adapted class on disk
try {
File file = new File(destinationDir + resource);
new File(file.getParent()).mkdirs(); // ensure we have a directory to write to
FileOutputStream fos = new FileOutputStream(file);
fos.write(b);
fos.close();
} catch (Exception e) {
throw new Error("Error writing to " + destinationDir + resource + " to disk", e);
}
}
public ClassLoader getClassLoader() {
SecurityManager security = System.getSecurityManager();
if (security != null) {
ClassLoader parentCL = RVMClass.getClassLoaderFromStackFrame(1);
if (parentCL != null) {
security.checkPermission(new RuntimePermission("getClassLoader"));
}
}
ClassLoader cl = type.getClassLoader();
return cl == BootstrapClassLoader.getBootstrapClassLoader() ? null : cl;
}
/**
* This method must be provided by the vm vendor, as it is used by other provided class
* implementations. For example, java.io.ObjectInputStream.readObject() and
* java.io.ObjectInputStream.resolveProxyClass(). It is also useful for other classes, such as
* java.rmi.server.RMIClassLoader. Walk the stack and answer the most recent non-null and
* non-bootstrap ClassLoader on the stack of the calling thread. If no such ClassLoader is found,
* null is returned. Notes: 1) This method operates on the defining classes of methods on stack.
* NOT the classes of receivers.
*
* @return the first non-bootstrap ClassLoader on the stack
*/
public static final ClassLoader getNonBootstrapClassLoader() {
StackBrowser browser = new StackBrowser();
browser.init();
while (browser.hasMoreFrames()) {
ClassLoader cl = browser.getClassLoader();
if (cl != BootstrapClassLoader.getBootstrapClassLoader() && cl != null) {
return cl;
}
browser.up();
}
return null;
}
/**
* This method must be provided by the vm vendor, as it is used by
* org.apache.harmony.kernel.vm.MsgHelp.setLocale() to get the bootstrap ClassLoader. MsgHelp uses
* the bootstrap ClassLoader to find the resource bundle of messages packaged with the bootstrap
* classes. Returns the ClassLoader of the method (including natives) at the specified depth on
* the stack of the calling thread. Frames representing the VM implementation of java.lang.reflect
* are not included in the list. This is not a public method as it can return the bootstrap class
* loader, which should not be accessed by non-bootstrap classes. Notes:
*
* <ul>
* <li>This method operates on the defining classes of methods on stack. NOT the classes of
* receivers.
* <li>The item at depth zero is the caller of this method
* </ul>
*
* @param depth the stack depth of the requested ClassLoader
* @return the ClassLoader at the specified depth
* @see java.lang.ClassLoader#getStackClassLoader
*/
static final ClassLoader getStackClassLoader(int depth) {
if (org.jikesrvm.VM.runningVM) {
ClassLoader ans = RVMClass.getClassLoaderFromStackFrame(depth);
if (ans == BootstrapClassLoader.getBootstrapClassLoader()) {
return null;
} else {
return ans;
}
} else {
return null;
}
};
/**
* This method must be included, as it is used by ResourceBundle.getBundle(), and other places as
* well. The reference implementation of this method uses the getStackClassLoader() method.
* Returns the ClassLoader of the method that called the caller. i.e. A.x() calls B.y() calls
* callerClassLoader(), A's ClassLoader will be returned. Returns null for the bootstrap
* ClassLoader.
*
* @return a ClassLoader or null for the bootstrap ClassLoader
* @throws SecurityException when called from a non-bootstrap Class
*/
public static ClassLoader callerClassLoader() {
if (org.jikesrvm.VM.runningVM) {
ClassLoader ans = RVMClass.getClassLoaderFromStackFrame(2);
if (ans == BootstrapClassLoader.getBootstrapClassLoader()) {
return null;
} else {
return ans;
}
} else {
return null;
}
}
public static Class<?> forName(String className, boolean initialize, ClassLoader classLoader)
throws ClassNotFoundException, LinkageError, ExceptionInInitializerError {
if (classLoader == null) {
SecurityManager security = System.getSecurityManager();
if (security != null) {
ClassLoader parentCL = RVMClass.getClassLoaderFromStackFrame(1);
if (parentCL != null) {
try {
security.checkPermission(new RuntimePermission("getClassLoader"));
} catch (SecurityException e) {
throw new ClassNotFoundException(
"Security exception when"
+ " trying to get a classloader so we can load the"
+ " class named \""
+ className
+ "\"",
e);
}
}
}
classLoader = BootstrapClassLoader.getBootstrapClassLoader();
}
return forNameInternal(className, initialize, classLoader);
}
/**
* This method must be provided by the vm vendor, as it is used by
* org.apache.harmony.luni.util.MsgHelp.setLocale() to get the bootstrap ClassLoader. MsgHelp uses
* the bootstrap ClassLoader to find the resource bundle of messages packaged with the bootstrap
* classes. The reference implementation of this method uses the getStackClassLoader() method.
*
* <p>Returns the ClassLoader of the method that called the caller. i.e. A.x() calls B.y() calls
* callerClassLoader(), A's ClassLoader will be returned. Returns null for the bootstrap
* ClassLoader.
*
* @return a ClassLoader
* @throws SecurityException when called from a non-bootstrap Class
*/
public static ClassLoader bootCallerClassLoader() {
return BootstrapClassLoader.getBootstrapClassLoader();
}
public InputStream getResourceAsStream(String resName) {
ClassLoader loader = type.getClassLoader();
if (loader == BootstrapClassLoader.getBootstrapClassLoader())
return ClassLoader.getSystemResourceAsStream(toResourceName(resName));
else return loader.getResourceAsStream(toResourceName(resName));
}
