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feat(jdk8): move files to new folder to avoid resources compiled.

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linkerlau
2025-09-07 15:25:52 +08:00
parent 3f0047bf6f
commit 8c35cfb1c0
17415 changed files with 217 additions and 213 deletions
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88
jdkSrc/jdk8/java/lang/instrument/ClassDefinition.java Normal file
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/*
* Copyright (c) 2003, 2011, 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.
*/
package java.lang.instrument;
/*
* Copyright 2003 Wily Technology, Inc.
*/
/**
* This class serves as a parameter block to the <code>Instrumentation.redefineClasses</code> method.
* Serves to bind the <code>Class</code> that needs redefining together with the new class file bytes.
*
* @see java.lang.instrument.Instrumentation#redefineClasses
* @since 1.5
*/
public final class ClassDefinition {
/**
* The class to redefine
*/
private final Class<?> mClass;
/**
* The replacement class file bytes
*/
private final byte[] mClassFile;
/**
* Creates a new <code>ClassDefinition</code> binding using the supplied
* class and class file bytes. Does not copy the supplied buffer, just captures a reference to it.
*
* @param theClass the <code>Class</code> that needs redefining
* @param theClassFile the new class file bytes
*
* @throws java.lang.NullPointerException if the supplied class or array is <code>null</code>.
*/
public
ClassDefinition( Class<?> theClass,
byte[] theClassFile) {
if (theClass == null || theClassFile == null) {
throw new NullPointerException();
}
mClass = theClass;
mClassFile = theClassFile;
}
/**
* Returns the class.
*
* @return the <code>Class</code> object referred to.
*/
public Class<?>
getDefinitionClass() {
return mClass;
}
/**
* Returns the array of bytes that contains the new class file.
*
* @return the class file bytes.
*/
public byte[]
getDefinitionClassFile() {
return mClassFile;
}
}

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jdkSrc/jdk8/java/lang/instrument/ClassFileTransformer.java Normal file
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/*
* Copyright (c) 2003, 2011, 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.
*/
package java.lang.instrument;
import java.security.ProtectionDomain;
/*
* Copyright 2003 Wily Technology, Inc.
*/
/**
* An agent provides an implementation of this interface in order
* to transform class files.
* The transformation occurs before the class is defined by the JVM.
* <P>
* Note the term <i>class file</i> is used as defined in section 3.1 of
* <cite>The Java&trade; Virtual Machine Specification</cite>,
* to mean a sequence
* of bytes in class file format, whether or not they reside in a file.
*
* @see java.lang.instrument.Instrumentation
* @see java.lang.instrument.Instrumentation#addTransformer
* @see java.lang.instrument.Instrumentation#removeTransformer
* @since 1.5
*/
public interface ClassFileTransformer {
/**
* The implementation of this method may transform the supplied class file and
* return a new replacement class file.
*
* <P>
* There are two kinds of transformers, determined by the <code>canRetransform</code>
* parameter of
* {@link java.lang.instrument.Instrumentation#addTransformer(ClassFileTransformer,boolean)}:
* <ul>
* <li><i>retransformation capable</i> transformers that were added with
* <code>canRetransform</code> as true
* </li>
* <li><i>retransformation incapable</i> transformers that were added with
* <code>canRetransform</code> as false or where added with
* {@link java.lang.instrument.Instrumentation#addTransformer(ClassFileTransformer)}
* </li>
* </ul>
*
* <P>
* Once a transformer has been registered with
* {@link java.lang.instrument.Instrumentation#addTransformer(ClassFileTransformer,boolean)
* addTransformer},
* the transformer will be called for every new class definition and every class redefinition.
* Retransformation capable transformers will also be called on every class retransformation.
* The request for a new class definition is made with
* {@link java.lang.ClassLoader#defineClass ClassLoader.defineClass}
* or its native equivalents.
* The request for a class redefinition is made with
* {@link java.lang.instrument.Instrumentation#redefineClasses Instrumentation.redefineClasses}
* or its native equivalents.
* The request for a class retransformation is made with
* {@link java.lang.instrument.Instrumentation#retransformClasses Instrumentation.retransformClasses}
* or its native equivalents.
* The transformer is called during the processing of the request, before the class file bytes
* have been verified or applied.
* When there are multiple transformers, transformations are composed by chaining the
* <code>transform</code> calls.
* That is, the byte array returned by one call to <code>transform</code> becomes the input
* (via the <code>classfileBuffer</code> parameter) to the next call.
*
* <P>
* Transformations are applied in the following order:
* <ul>
* <li>Retransformation incapable transformers
* </li>
* <li>Retransformation incapable native transformers
* </li>
* <li>Retransformation capable transformers
* </li>
* <li>Retransformation capable native transformers
* </li>
* </ul>
*
* <P>
* For retransformations, the retransformation incapable transformers are not
* called, instead the result of the previous transformation is reused.
* In all other cases, this method is called.
* Within each of these groupings, transformers are called in the order registered.
* Native transformers are provided by the <code>ClassFileLoadHook</code> event
* in the Java Virtual Machine Tool Interface).
*
* <P>
* The input (via the <code>classfileBuffer</code> parameter) to the first
* transformer is:
* <ul>
* <li>for new class definition,
* the bytes passed to <code>ClassLoader.defineClass</code>
* </li>
* <li>for class redefinition,
* <code>definitions.getDefinitionClassFile()</code> where
* <code>definitions</code> is the parameter to
* {@link java.lang.instrument.Instrumentation#redefineClasses
* Instrumentation.redefineClasses}
* </li>
* <li>for class retransformation,
* the bytes passed to the new class definition or, if redefined,
* the last redefinition, with all transformations made by retransformation
* incapable transformers reapplied automatically and unaltered;
* for details see
* {@link java.lang.instrument.Instrumentation#retransformClasses
* Instrumentation.retransformClasses}
* </li>
* </ul>
*
* <P>
* If the implementing method determines that no transformations are needed,
* it should return <code>null</code>.
* Otherwise, it should create a new <code>byte[]</code> array,
* copy the input <code>classfileBuffer</code> into it,
* along with all desired transformations, and return the new array.
* The input <code>classfileBuffer</code> must not be modified.
*
* <P>
* In the retransform and redefine cases,
* the transformer must support the redefinition semantics:
* if a class that the transformer changed during initial definition is later
* retransformed or redefined, the
* transformer must insure that the second class output class file is a legal
* redefinition of the first output class file.
*
* <P>
* If the transformer throws an exception (which it doesn't catch),
* subsequent transformers will still be called and the load, redefine
* or retransform will still be attempted.
* Thus, throwing an exception has the same effect as returning <code>null</code>.
* To prevent unexpected behavior when unchecked exceptions are generated
* in transformer code, a transformer can catch <code>Throwable</code>.
* If the transformer believes the <code>classFileBuffer</code> does not
* represent a validly formatted class file, it should throw
* an <code>IllegalClassFormatException</code>;
* while this has the same effect as returning null. it facilitates the
* logging or debugging of format corruptions.
*
* @param loader the defining loader of the class to be transformed,
* may be <code>null</code> if the bootstrap loader
* @param className the name of the class in the internal form of fully
* qualified class and interface names as defined in
* <i>The Java Virtual Machine Specification</i>.
* For example, <code>"java/util/List"</code>.
* @param classBeingRedefined if this is triggered by a redefine or retransform,
* the class being redefined or retransformed;
* if this is a class load, <code>null</code>
* @param protectionDomain the protection domain of the class being defined or redefined
* @param classfileBuffer the input byte buffer in class file format - must not be modified
*
* @throws IllegalClassFormatException if the input does not represent a well-formed class file
* @return a well-formed class file buffer (the result of the transform),
or <code>null</code> if no transform is performed.
* @see Instrumentation#redefineClasses
*/
byte[]
transform( ClassLoader loader,
String className,
Class<?> classBeingRedefined,
ProtectionDomain protectionDomain,
byte[] classfileBuffer)
throws IllegalClassFormatException;
}

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jdkSrc/jdk8/java/lang/instrument/IllegalClassFormatException.java Normal file
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/*
* Copyright (c) 2003, 2008, 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.
*/
package java.lang.instrument;
/*
* Copyright 2003 Wily Technology, Inc.
*/
/**
* Thrown by an implementation of
* {@link java.lang.instrument.ClassFileTransformer#transform ClassFileTransformer.transform}
* when its input parameters are invalid.
* This may occur either because the initial class file bytes were
* invalid or a previously applied transform corrupted the bytes.
*
* @see java.lang.instrument.ClassFileTransformer#transform
* @since 1.5
*/
public class IllegalClassFormatException extends Exception {
private static final long serialVersionUID = -3841736710924794009L;
/**
* Constructs an <code>IllegalClassFormatException</code> with no
* detail message.
*/
public
IllegalClassFormatException() {
super();
}
/**
* Constructs an <code>IllegalClassFormatException</code> with the
* specified detail message.
*
* @param s the detail message.
*/
public
IllegalClassFormatException(String s) {
super(s);
}
}

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jdkSrc/jdk8/java/lang/instrument/Instrumentation.java Normal file
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/*
* Copyright (c) 2003, 2013, 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.
*/
package java.lang.instrument;
import java.io.File;
import java.io.IOException;
import java.util.jar.JarFile;
/*
* Copyright 2003 Wily Technology, Inc.
*/
/**
* This class provides services needed to instrument Java
* programming language code.
* Instrumentation is the addition of byte-codes to methods for the
* purpose of gathering data to be utilized by tools.
* Since the changes are purely additive, these tools do not modify
* application state or behavior.
* Examples of such benign tools include monitoring agents, profilers,
* coverage analyzers, and event loggers.
*
* <P>
* There are two ways to obtain an instance of the
* <code>Instrumentation</code> interface:
*
* <ol>
* <li><p> When a JVM is launched in a way that indicates an agent
* class. In that case an <code>Instrumentation</code> instance
* is passed to the <code>premain</code> method of the agent class.
* </p></li>
* <li><p> When a JVM provides a mechanism to start agents sometime
* after the JVM is launched. In that case an <code>Instrumentation</code>
* instance is passed to the <code>agentmain</code> method of the
* agent code. </p> </li>
* </ol>
* <p>
* These mechanisms are described in the
* {@linkplain java.lang.instrument package specification}.
* <p>
* Once an agent acquires an <code>Instrumentation</code> instance,
* the agent may call methods on the instance at any time.
*
* @since 1.5
*/
public interface Instrumentation {
/**
* Registers the supplied transformer. All future class definitions
* will be seen by the transformer, except definitions of classes upon which any
* registered transformer is dependent.
* The transformer is called when classes are loaded, when they are
* {@linkplain #redefineClasses redefined}. and if <code>canRetransform</code> is true,
* when they are {@linkplain #retransformClasses retransformed}.
* See {@link java.lang.instrument.ClassFileTransformer#transform
* ClassFileTransformer.transform} for the order
* of transform calls.
* If a transformer throws
* an exception during execution, the JVM will still call the other registered
* transformers in order. The same transformer may be added more than once,
* but it is strongly discouraged -- avoid this by creating a new instance of
* transformer class.
* <P>
* This method is intended for use in instrumentation, as described in the
* {@linkplain Instrumentation class specification}.
*
* @param transformer the transformer to register
* @param canRetransform can this transformer's transformations be retransformed
* @throws java.lang.NullPointerException if passed a <code>null</code> transformer
* @throws java.lang.UnsupportedOperationException if <code>canRetransform</code>
* is true and the current configuration of the JVM does not allow
* retransformation ({@link #isRetransformClassesSupported} is false)
* @since 1.6
*/
void
addTransformer(ClassFileTransformer transformer, boolean canRetransform);
/**
* Registers the supplied transformer.
* <P>
* Same as <code>addTransformer(transformer, false)</code>.
*
* @param transformer the transformer to register
* @throws java.lang.NullPointerException if passed a <code>null</code> transformer
* @see #addTransformer(ClassFileTransformer,boolean)
*/
void
addTransformer(ClassFileTransformer transformer);
/**
* Unregisters the supplied transformer. Future class definitions will
* not be shown to the transformer. Removes the most-recently-added matching
* instance of the transformer. Due to the multi-threaded nature of
* class loading, it is possible for a transformer to receive calls
* after it has been removed. Transformers should be written defensively
* to expect this situation.
*
* @param transformer the transformer to unregister
* @return true if the transformer was found and removed, false if the
* transformer was not found
* @throws java.lang.NullPointerException if passed a <code>null</code> transformer
*/
boolean
removeTransformer(ClassFileTransformer transformer);
/**
* Returns whether or not the current JVM configuration supports retransformation
* of classes.
* The ability to retransform an already loaded class is an optional capability
* of a JVM.
* Retransformation will only be supported if the
* <code>Can-Retransform-Classes</code> manifest attribute is set to
* <code>true</code> in the agent JAR file (as described in the
* {@linkplain java.lang.instrument package specification}) and the JVM supports
* this capability.
* During a single instantiation of a single JVM, multiple calls to this
* method will always return the same answer.
* @return true if the current JVM configuration supports retransformation of
* classes, false if not.
* @see #retransformClasses
* @since 1.6
*/
boolean
isRetransformClassesSupported();
/**
* Retransform the supplied set of classes.
*
* <P>
* This function facilitates the instrumentation
* of already loaded classes.
* When classes are initially loaded or when they are
* {@linkplain #redefineClasses redefined},
* the initial class file bytes can be transformed with the
* {@link java.lang.instrument.ClassFileTransformer ClassFileTransformer}.
* This function reruns the transformation process
* (whether or not a transformation has previously occurred).
* This retransformation follows these steps:
* <ul>
* <li>starting from the initial class file bytes
* </li>
* <li>for each transformer that was added with <code>canRetransform</code>
* false, the bytes returned by
* {@link java.lang.instrument.ClassFileTransformer#transform transform}
* during the last class load or redefine are
* reused as the output of the transformation; note that this is
* equivalent to reapplying the previous transformation, unaltered;
* except that
* {@link java.lang.instrument.ClassFileTransformer#transform transform}
* is not called
* </li>
* <li>for each transformer that was added with <code>canRetransform</code>
* true, the
* {@link java.lang.instrument.ClassFileTransformer#transform transform}
* method is called in these transformers
* </li>
* <li>the transformed class file bytes are installed as the new
* definition of the class
* </li>
* </ul>
* <P>
*
* The order of transformation is described in the
* {@link java.lang.instrument.ClassFileTransformer#transform transform} method.
* This same order is used in the automatic reapplication of retransformation
* incapable transforms.
* <P>
*
* The initial class file bytes represent the bytes passed to
* {@link java.lang.ClassLoader#defineClass ClassLoader.defineClass} or
* {@link #redefineClasses redefineClasses}
* (before any transformations
* were applied), however they might not exactly match them.
* The constant pool might not have the same layout or contents.
* The constant pool may have more or fewer entries.
* Constant pool entries may be in a different order; however,
* constant pool indices in the bytecodes of methods will correspond.
* Some attributes may not be present.
* Where order is not meaningful, for example the order of methods,
* order might not be preserved.
*
* <P>
* This method operates on
* a set in order to allow interdependent changes to more than one class at the same time
* (a retransformation of class A can require a retransformation of class B).
*
* <P>
* If a retransformed method has active stack frames, those active frames continue to
* run the bytecodes of the original method.
* The retransformed method will be used on new invokes.
*
* <P>
* This method does not cause any initialization except that which would occur
* under the customary JVM semantics. In other words, redefining a class
* does not cause its initializers to be run. The values of static variables
* will remain as they were prior to the call.
*
* <P>
* Instances of the retransformed class are not affected.
*
* <P>
* The retransformation may change method bodies, the constant pool and attributes.
* The retransformation must not add, remove or rename fields or methods, change the
* signatures of methods, or change inheritance. These restrictions maybe be
* lifted in future versions. The class file bytes are not checked, verified and installed
* until after the transformations have been applied, if the resultant bytes are in
* error this method will throw an exception.
*
* <P>
* If this method throws an exception, no classes have been retransformed.
* <P>
* This method is intended for use in instrumentation, as described in the
* {@linkplain Instrumentation class specification}.
*
* @param classes array of classes to retransform;
* a zero-length array is allowed, in this case, this method does nothing
* @throws java.lang.instrument.UnmodifiableClassException if a specified class cannot be modified
* ({@link #isModifiableClass} would return <code>false</code>)
* @throws java.lang.UnsupportedOperationException if the current configuration of the JVM does not allow
* retransformation ({@link #isRetransformClassesSupported} is false) or the retransformation attempted
* to make unsupported changes
* @throws java.lang.ClassFormatError if the data did not contain a valid class
* @throws java.lang.NoClassDefFoundError if the name in the class file is not equal to the name of the class
* @throws java.lang.UnsupportedClassVersionError if the class file version numbers are not supported
* @throws java.lang.ClassCircularityError if the new classes contain a circularity
* @throws java.lang.LinkageError if a linkage error occurs
* @throws java.lang.NullPointerException if the supplied classes array or any of its components
* is <code>null</code>.
*
* @see #isRetransformClassesSupported
* @see #addTransformer
* @see java.lang.instrument.ClassFileTransformer
* @since 1.6
*/
void
retransformClasses(Class<?>... classes) throws UnmodifiableClassException;
/**
* Returns whether or not the current JVM configuration supports redefinition
* of classes.
* The ability to redefine an already loaded class is an optional capability
* of a JVM.
* Redefinition will only be supported if the
* <code>Can-Redefine-Classes</code> manifest attribute is set to
* <code>true</code> in the agent JAR file (as described in the
* {@linkplain java.lang.instrument package specification}) and the JVM supports
* this capability.
* During a single instantiation of a single JVM, multiple calls to this
* method will always return the same answer.
* @return true if the current JVM configuration supports redefinition of classes,
* false if not.
* @see #redefineClasses
*/
boolean
isRedefineClassesSupported();
/**
* Redefine the supplied set of classes using the supplied class files.
*
* <P>
* This method is used to replace the definition of a class without reference
* to the existing class file bytes, as one might do when recompiling from source
* for fix-and-continue debugging.
* Where the existing class file bytes are to be transformed (for
* example in bytecode instrumentation)
* {@link #retransformClasses retransformClasses}
* should be used.
*
* <P>
* This method operates on
* a set in order to allow interdependent changes to more than one class at the same time
* (a redefinition of class A can require a redefinition of class B).
*
* <P>
* If a redefined method has active stack frames, those active frames continue to
* run the bytecodes of the original method.
* The redefined method will be used on new invokes.
*
* <P>
* This method does not cause any initialization except that which would occur
* under the customary JVM semantics. In other words, redefining a class
* does not cause its initializers to be run. The values of static variables
* will remain as they were prior to the call.
*
* <P>
* Instances of the redefined class are not affected.
*
* <P>
* The redefinition may change method bodies, the constant pool and attributes.
* The redefinition must not add, remove or rename fields or methods, change the
* signatures of methods, or change inheritance. These restrictions maybe be
* lifted in future versions. The class file bytes are not checked, verified and installed
* until after the transformations have been applied, if the resultant bytes are in
* error this method will throw an exception.
*
* <P>
* If this method throws an exception, no classes have been redefined.
* <P>
* This method is intended for use in instrumentation, as described in the
* {@linkplain Instrumentation class specification}.
*
* @param definitions array of classes to redefine with corresponding definitions;
* a zero-length array is allowed, in this case, this method does nothing
* @throws java.lang.instrument.UnmodifiableClassException if a specified class cannot be modified
* ({@link #isModifiableClass} would return <code>false</code>)
* @throws java.lang.UnsupportedOperationException if the current configuration of the JVM does not allow
* redefinition ({@link #isRedefineClassesSupported} is false) or the redefinition attempted
* to make unsupported changes
* @throws java.lang.ClassFormatError if the data did not contain a valid class
* @throws java.lang.NoClassDefFoundError if the name in the class file is not equal to the name of the class
* @throws java.lang.UnsupportedClassVersionError if the class file version numbers are not supported
* @throws java.lang.ClassCircularityError if the new classes contain a circularity
* @throws java.lang.LinkageError if a linkage error occurs
* @throws java.lang.NullPointerException if the supplied definitions array or any of its components
* is <code>null</code>
* @throws java.lang.ClassNotFoundException Can never be thrown (present for compatibility reasons only)
*
* @see #isRedefineClassesSupported
* @see #addTransformer
* @see java.lang.instrument.ClassFileTransformer
*/
void
redefineClasses(ClassDefinition... definitions)
throws ClassNotFoundException, UnmodifiableClassException;
/**
* Determines whether a class is modifiable by
* {@linkplain #retransformClasses retransformation}
* or {@linkplain #redefineClasses redefinition}.
* If a class is modifiable then this method returns <code>true</code>.
* If a class is not modifiable then this method returns <code>false</code>.
* <P>
* For a class to be retransformed, {@link #isRetransformClassesSupported} must also be true.
* But the value of <code>isRetransformClassesSupported()</code> does not influence the value
* returned by this function.
* For a class to be redefined, {@link #isRedefineClassesSupported} must also be true.
* But the value of <code>isRedefineClassesSupported()</code> does not influence the value
* returned by this function.
* <P>
* Primitive classes (for example, <code>java.lang.Integer.TYPE</code>)
* and array classes are never modifiable.
*
* @param theClass the class to check for being modifiable
* @return whether or not the argument class is modifiable
* @throws java.lang.NullPointerException if the specified class is <code>null</code>.
*
* @see #retransformClasses
* @see #isRetransformClassesSupported
* @see #redefineClasses
* @see #isRedefineClassesSupported
* @since 1.6
*/
boolean
isModifiableClass(Class<?> theClass);
/**
* Returns an array of all classes currently loaded by the JVM.
*
* @return an array containing all the classes loaded by the JVM, zero-length if there are none
*/
@SuppressWarnings("rawtypes")
Class[]
getAllLoadedClasses();
/**
* Returns an array of all classes for which <code>loader</code> is an initiating loader.
* If the supplied loader is <code>null</code>, classes initiated by the bootstrap class
* loader are returned.
*
* @param loader the loader whose initiated class list will be returned
* @return an array containing all the classes for which loader is an initiating loader,
* zero-length if there are none
*/
@SuppressWarnings("rawtypes")
Class[]
getInitiatedClasses(ClassLoader loader);
/**
* Returns an implementation-specific approximation of the amount of storage consumed by
* the specified object. The result may include some or all of the object's overhead,
* and thus is useful for comparison within an implementation but not between implementations.
*
* The estimate may change during a single invocation of the JVM.
*
* @param objectToSize the object to size
* @return an implementation-specific approximation of the amount of storage consumed by the specified object
* @throws java.lang.NullPointerException if the supplied Object is <code>null</code>.
*/
long
getObjectSize(Object objectToSize);
/**
* Specifies a JAR file with instrumentation classes to be defined by the
* bootstrap class loader.
*
* <p> When the virtual machine's built-in class loader, known as the "bootstrap
* class loader", unsuccessfully searches for a class, the entries in the {@link
* java.util.jar.JarFile JAR file} will be searched as well.
*
* <p> This method may be used multiple times to add multiple JAR files to be
* searched in the order that this method was invoked.
*
* <p> The agent should take care to ensure that the JAR does not contain any
* classes or resources other than those to be defined by the bootstrap
* class loader for the purpose of instrumentation.
* Failure to observe this warning could result in unexpected
* behavior that is difficult to diagnose. For example, suppose there is a
* loader L, and L's parent for delegation is the bootstrap class loader.
* Furthermore, a method in class C, a class defined by L, makes reference to
* a non-public accessor class C$1. If the JAR file contains a class C$1 then
* the delegation to the bootstrap class loader will cause C$1 to be defined
* by the bootstrap class loader. In this example an <code>IllegalAccessError</code>
* will be thrown that may cause the application to fail. One approach to
* avoiding these types of issues, is to use a unique package name for the
* instrumentation classes.
*
* <p>
* <cite>The Java&trade; Virtual Machine Specification</cite>
* specifies that a subsequent attempt to resolve a symbolic
* reference that the Java virtual machine has previously unsuccessfully attempted
* to resolve always fails with the same error that was thrown as a result of the
* initial resolution attempt. Consequently, if the JAR file contains an entry
* that corresponds to a class for which the Java virtual machine has
* unsuccessfully attempted to resolve a reference, then subsequent attempts to
* resolve that reference will fail with the same error as the initial attempt.
*
* @param jarfile
* The JAR file to be searched when the bootstrap class loader
* unsuccessfully searches for a class.
*
* @throws NullPointerException
* If <code>jarfile</code> is <code>null</code>.
*
* @see #appendToSystemClassLoaderSearch
* @see java.lang.ClassLoader
* @see java.util.jar.JarFile
*
* @since 1.6
*/
void
appendToBootstrapClassLoaderSearch(JarFile jarfile);
/**
* Specifies a JAR file with instrumentation classes to be defined by the
* system class loader.
*
* When the system class loader for delegation (see
* {@link java.lang.ClassLoader#getSystemClassLoader getSystemClassLoader()})
* unsuccessfully searches for a class, the entries in the {@link
* java.util.jar.JarFile JarFile} will be searched as well.
*
* <p> This method may be used multiple times to add multiple JAR files to be
* searched in the order that this method was invoked.
*
* <p> The agent should take care to ensure that the JAR does not contain any
* classes or resources other than those to be defined by the system class
* loader for the purpose of instrumentation.
* Failure to observe this warning could result in unexpected
* behavior that is difficult to diagnose (see
* {@link #appendToBootstrapClassLoaderSearch
* appendToBootstrapClassLoaderSearch}).
*
* <p> The system class loader supports adding a JAR file to be searched if
* it implements a method named <code>appendToClassPathForInstrumentation</code>
* which takes a single parameter of type <code>java.lang.String</code>. The
* method is not required to have <code>public</code> access. The name of
* the JAR file is obtained by invoking the {@link java.util.zip.ZipFile#getName
* getName()} method on the <code>jarfile</code> and this is provided as the
* parameter to the <code>appendToClassPathForInstrumentation</code> method.
*
* <p>
* <cite>The Java&trade; Virtual Machine Specification</cite>
* specifies that a subsequent attempt to resolve a symbolic
* reference that the Java virtual machine has previously unsuccessfully attempted
* to resolve always fails with the same error that was thrown as a result of the
* initial resolution attempt. Consequently, if the JAR file contains an entry
* that corresponds to a class for which the Java virtual machine has
* unsuccessfully attempted to resolve a reference, then subsequent attempts to
* resolve that reference will fail with the same error as the initial attempt.
*
* <p> This method does not change the value of <code>java.class.path</code>
* {@link java.lang.System#getProperties system property}.
*
* @param jarfile
* The JAR file to be searched when the system class loader
* unsuccessfully searches for a class.
*
* @throws UnsupportedOperationException
* If the system class loader does not support appending a
* a JAR file to be searched.
*
* @throws NullPointerException
* If <code>jarfile</code> is <code>null</code>.
*
* @see #appendToBootstrapClassLoaderSearch
* @see java.lang.ClassLoader#getSystemClassLoader
* @see java.util.jar.JarFile
* @since 1.6
*/
void
appendToSystemClassLoaderSearch(JarFile jarfile);
/**
* Returns whether the current JVM configuration supports
* {@linkplain #setNativeMethodPrefix(ClassFileTransformer,String)
* setting a native method prefix}.
* The ability to set a native method prefix is an optional
* capability of a JVM.
* Setting a native method prefix will only be supported if the
* <code>Can-Set-Native-Method-Prefix</code> manifest attribute is set to
* <code>true</code> in the agent JAR file (as described in the
* {@linkplain java.lang.instrument package specification}) and the JVM supports
* this capability.
* During a single instantiation of a single JVM, multiple
* calls to this method will always return the same answer.
* @return true if the current JVM configuration supports
* setting a native method prefix, false if not.
* @see #setNativeMethodPrefix
* @since 1.6
*/
boolean
isNativeMethodPrefixSupported();
/**
* This method modifies the failure handling of
* native method resolution by allowing retry
* with a prefix applied to the name.
* When used with the
* {@link java.lang.instrument.ClassFileTransformer ClassFileTransformer},
* it enables native methods to be
* instrumented.
* <p>
* Since native methods cannot be directly instrumented
* (they have no bytecodes), they must be wrapped with
* a non-native method which can be instrumented.
* For example, if we had:
* <pre>
* native boolean foo(int x);</pre>
* <p>
* We could transform the class file (with the
* ClassFileTransformer during the initial definition
* of the class) so that this becomes:
* <pre>
* boolean foo(int x) {
* <i>... record entry to foo ...</i>
* return wrapped_foo(x);
* }
*
* native boolean wrapped_foo(int x);</pre>
* <p>
* Where <code>foo</code> becomes a wrapper for the actual native
* method with the appended prefix "wrapped_". Note that
* "wrapped_" would be a poor choice of prefix since it
* might conceivably form the name of an existing method
* thus something like "$$$MyAgentWrapped$$$_" would be
* better but would make these examples less readable.
* <p>
* The wrapper will allow data to be collected on the native
* method call, but now the problem becomes linking up the
* wrapped method with the native implementation.
* That is, the method <code>wrapped_foo</code> needs to be
* resolved to the native implementation of <code>foo</code>,
* which might be:
* <pre>
* Java_somePackage_someClass_foo(JNIEnv* env, jint x)</pre>
* <p>
* This function allows the prefix to be specified and the
* proper resolution to occur.
* Specifically, when the standard resolution fails, the
* resolution is retried taking the prefix into consideration.
* There are two ways that resolution occurs, explicit
* resolution with the JNI function <code>RegisterNatives</code>
* and the normal automatic resolution. For
* <code>RegisterNatives</code>, the JVM will attempt this
* association:
* <pre>{@code
* method(foo) -> nativeImplementation(foo)
* }</pre>
* <p>
* When this fails, the resolution will be retried with
* the specified prefix prepended to the method name,
* yielding the correct resolution:
* <pre>{@code
* method(wrapped_foo) -> nativeImplementation(foo)
* }</pre>
* <p>
* For automatic resolution, the JVM will attempt:
* <pre>{@code
* method(wrapped_foo) -> nativeImplementation(wrapped_foo)
* }</pre>
* <p>
* When this fails, the resolution will be retried with
* the specified prefix deleted from the implementation name,
* yielding the correct resolution:
* <pre>{@code
* method(wrapped_foo) -> nativeImplementation(foo)
* }</pre>
* <p>
* Note that since the prefix is only used when standard
* resolution fails, native methods can be wrapped selectively.
* <p>
* Since each <code>ClassFileTransformer</code>
* can do its own transformation of the bytecodes, more
* than one layer of wrappers may be applied. Thus each
* transformer needs its own prefix. Since transformations
* are applied in order, the prefixes, if applied, will
* be applied in the same order
* (see {@link #addTransformer(ClassFileTransformer,boolean) addTransformer}).
* Thus if three transformers applied
* wrappers, <code>foo</code> might become
* <code>$trans3_$trans2_$trans1_foo</code>. But if, say,
* the second transformer did not apply a wrapper to
* <code>foo</code> it would be just
* <code>$trans3_$trans1_foo</code>. To be able to
* efficiently determine the sequence of prefixes,
* an intermediate prefix is only applied if its non-native
* wrapper exists. Thus, in the last example, even though
* <code>$trans1_foo</code> is not a native method, the
* <code>$trans1_</code> prefix is applied since
* <code>$trans1_foo</code> exists.
*
* @param transformer
* The ClassFileTransformer which wraps using this prefix.
* @param prefix
* The prefix to apply to wrapped native methods when
* retrying a failed native method resolution. If prefix
* is either <code>null</code> or the empty string, then
* failed native method resolutions are not retried for
* this transformer.
* @throws java.lang.NullPointerException if passed a <code>null</code> transformer.
* @throws java.lang.UnsupportedOperationException if the current configuration of
* the JVM does not allow setting a native method prefix
* ({@link #isNativeMethodPrefixSupported} is false).
* @throws java.lang.IllegalArgumentException if the transformer is not registered
* (see {@link #addTransformer(ClassFileTransformer,boolean) addTransformer}).
*
* @since 1.6
*/
void
setNativeMethodPrefix(ClassFileTransformer transformer, String prefix);
}

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/*
* Copyright (c) 2004, 2008, 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.
*/
package java.lang.instrument;
/**
* Thrown by an implementation of
* {@link java.lang.instrument.Instrumentation#redefineClasses Instrumentation.redefineClasses}
* when one of the specified classes cannot be modified.
*
* @see java.lang.instrument.Instrumentation#redefineClasses
* @since 1.5
*/
public class UnmodifiableClassException extends Exception {
private static final long serialVersionUID = 1716652643585309178L;
/**
* Constructs an <code>UnmodifiableClassException</code> with no
* detail message.
*/
public
UnmodifiableClassException() {
super();
}
/**
* Constructs an <code>UnmodifiableClassException</code> with the
* specified detail message.
*
* @param s the detail message.
*/
public
UnmodifiableClassException(String s) {
super(s);
}
}