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/*
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* Copyright 1998-2006 Sun Microsystems, Inc. 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. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package com.sun.jdi;
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import java.util.List;
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import java.util.Map;
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/**
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* An object that currently exists in the target VM. An ObjectReference
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* mirrors only the object itself and is not specific to any
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* {@link Field} or {@link LocalVariable} to which it is currently
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* assigned. An ObjectReference can
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* have 0 or more references from field(s) and/or variable(s).
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* <p>
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* Any method on <code>ObjectReference</code> which directly or
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* indirectly takes <code>ObjectReference</code> as an parameter may throw
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* {@link com.sun.jdi.VMDisconnectedException} if the target VM is
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* disconnected and the {@link com.sun.jdi.event.VMDisconnectEvent} has been or is
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* available to be read from the {@link com.sun.jdi.event.EventQueue}.
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* <p>
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* Any method on <code>ObjectReference</code> which directly or
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* indirectly takes <code>ObjectReference</code> as an parameter may throw
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* {@link com.sun.jdi.VMOutOfMemoryException} if the target VM has run out of memory.
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* <p>
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* Any method on <code>ObjectReference</code> or which directly or indirectly takes
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* <code>ObjectReference</code> as parameter may throw
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* {@link com.sun.jdi.ObjectCollectedException} if the mirrored object has been
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* garbage collected.
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*
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* @author Robert Field
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* @author Gordon Hirsch
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* @author James McIlree
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* @since 1.3
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*/
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public interface ObjectReference extends Value
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{
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/**
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* Gets the {@link ReferenceType} that mirrors the type
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* of this object. The type may be a subclass or implementor of the
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* declared type of any field or variable which currently holds it.
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* For example, right after the following statement.
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* <p>
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* <code>Object obj = new String("Hello, world!");</code>
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* <p>
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* The ReferenceType of obj will mirror java.lang.String and not
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* java.lang.Object.
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* <p>
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* The type of an object never changes, so this method will
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* always return the same ReferenceType over the lifetime of the
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* mirrored object.
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* <p>
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* The returned ReferenceType will be a {@link ClassType} or
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* {@link ArrayType} and never an {@link InterfaceType}.
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*
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* @return the {@link ReferenceType} for this object.
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*/
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ReferenceType referenceType();
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/**
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* Gets the value of a given instance or static field in this object.
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* The Field must be valid for this ObjectReference;
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* that is, it must be from
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* the mirrored object's class or a superclass of that class.
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*
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* @param sig the field containing the requested value
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* @return the {@link Value} of the instance field.
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* @throws java.lang.IllegalArgumentException if the field is not valid for
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* this object's class.
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*/
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Value getValue(Field sig);
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/**
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* Gets the value of multiple instance and/or static fields in this object.
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* The Fields must be valid for this ObjectReference;
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* that is, they must be from
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* the mirrored object's class or a superclass of that class.
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*
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* @param fields a list of {@link Field} objects containing the
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* requested values.
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* @return a Map of the requested {@link Field} objects with
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* their {@link Value}.
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* @throws java.lang.IllegalArgumentException if any field is not valid for
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* this object's class.
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*/
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Map<Field,Value> getValues(List<? extends Field> fields);
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/**
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* Sets the value of a given instance or static field in this object.
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* The {@link Field} must be valid for this ObjectReference; that is,
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* it must be from the mirrored object's class or a superclass of that class.
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* If static, the field must not be final.
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* <p>
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* Object values must be assignment compatible with the field type
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* (This implies that the field type must be loaded through the
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* enclosing class's class loader). Primitive values must be
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* either assignment compatible with the field type or must be
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* convertible to the field type without loss of information.
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* See the <a href="http://java.sun.com/docs/books/jls/">
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* Java<sup><font size=-2>TM</font></sup> Language Specification</a>.
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* section
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* <a href="http://java.sun.com/docs/books/jls/second_edition/html/conversions.doc.html#184206">5.2</a>
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* for more information on assignment
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* compatibility.
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*
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* @param field the field containing the requested value
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* @param value the new value to assign
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* @throws java.lang.IllegalArgumentException if the field is not valid for
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* this object's class.
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* @throws InvalidTypeException if the value's type does not match
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* the field's type.
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* @throws ClassNotLoadedException if 'value' is not null, and the field
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* type has not yet been loaded through the appropriate class loader.
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* @throws VMCannotBeModifiedException if the VirtualMachine is read-only - see {@link VirtualMachine#canBeModified()}.
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*/
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void setValue(Field field, Value value)
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throws InvalidTypeException, ClassNotLoadedException;
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/** Perform method invocation with only the invoking thread resumed */
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static final int INVOKE_SINGLE_THREADED = 0x1;
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/** Perform non-virtual method invocation */
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static final int INVOKE_NONVIRTUAL = 0x2;
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/**
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* Invokes the specified {@link Method} on this object in the
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* target VM. The
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* specified method can be defined in this object's class,
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* in a superclass of this object's class, or in an interface
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* implemented by this object. The method may be a static method
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* or an instance method, but not a static initializer or constructor.
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* Use {@link ClassType#newInstance} to create a new object and
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* run its constructor.
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* <p>
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* The method invocation will occur in the specified thread.
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* Method invocation can occur only if the specified thread
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* has been suspended by an event which occurred in that thread.
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* Method invocation is not supported
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* when the target VM has been suspended through
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* {@link VirtualMachine#suspend} or when the specified thread
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* is suspended through {@link ThreadReference#suspend}.
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* <p>
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* The specified method is invoked with the arguments in the specified
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* argument list. The method invocation is synchronous; this method
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* does not return until the invoked method returns in the target VM.
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* If the invoked method throws an exception, this method
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* will throw an {@link InvocationException} which contains
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* a mirror to the exception object thrown.
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* <p>
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* Object arguments must be assignment compatible with the argument type
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* (This implies that the argument type must be loaded through the
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* enclosing class's class loader). Primitive arguments must be
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* either assignment compatible with the argument type or must be
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* convertible to the argument type without loss of information.
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* If the method being called accepts a variable number of arguments,
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* then the last argument type is an array of some component type.
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* The argument in the matching position can be omitted, or can be null,
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* an array of the same component type, or an argument of the
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* component type followed by any number of other arguments of the same
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* type. If the argument is omitted, then a 0 length array of the
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* component type is passed. The component type can be a primitive type.
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* Autoboxing is not supported.
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*
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* See the <a href="http://java.sun.com/docs/books/jls/">
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* Java Language Specification</a>.
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* section
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* <a href="http://java.sun.com/docs/books/jls/second_edition/html/conversions.doc.html#184206">5.2</a>
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* for more information on assignment compatibility.
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* <p>
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* By default, the method is invoked using dynamic lookup as
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* documented in the
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* <a href="http://java.sun.com/docs/books/jls/">
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* Java Language Specification</a>
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* second edition, section
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* <a href="http://java.sun.com/docs/books/jls/second_edition/html/expressions.doc.html#45606">15.12.4.4</a>;
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* in particular, overriding based on the runtime type of the object
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* mirrored by this {@link ObjectReference} will occur. This
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* behavior can be changed by specifying the
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* {@link #INVOKE_NONVIRTUAL} bit flag in the <code>options</code>
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* argument. If this flag is set, the specified method is invoked
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* whether or not it is overridden for this object's runtime type.
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* The method, in this case, must not belong to an interface and
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* must not be abstract. This option is useful for performing method
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* invocations like those done with the <code>super</code> keyword in
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* the Java programming language.
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* <p>
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* By default, all threads in the target VM are resumed while
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* the method is being invoked if they were previously
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* suspended by an event or by {@link VirtualMachine#suspend} or
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* {@link ThreadReference#suspend}. This is done to prevent the deadlocks
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* that will occur if any of the threads own monitors
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* that will be needed by the invoked method.
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* Note, however, that this implicit resume acts exactly like
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* {@link ThreadReference#resume}, so if the thread's suspend
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* count is greater than 1, it will remain in a suspended state
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* during the invocation and thus a deadlock could still occur.
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* By default, when the invocation completes,
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* all threads in the target VM are suspended, regardless their state
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* before the invocation.
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* It is possible that
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* breakpoints or other events might occur during the invocation.
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* This can cause deadlocks as described above. It can also cause a deadlock
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* if invokeMethod is called from the client's event handler thread. In this
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* case, this thread will be waiting for the invokeMethod to complete and
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* won't read the EventSet that comes in for the new event. If this
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* new EventSet is SUSPEND_ALL, then a deadlock will occur because no
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* one will resume the EventSet. To avoid this, all EventRequests should
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* be disabled before doing the invokeMethod, or the invokeMethod should
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* not be done from the client's event handler thread.
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* <p>
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* The resumption of other threads during the invocation can be prevented
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* by specifying the {@link #INVOKE_SINGLE_THREADED}
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* bit flag in the <code>options</code> argument; however,
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* there is no protection against or recovery from the deadlocks
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* described above, so this option should be used with great caution.
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* Only the specified thread will be resumed (as described for all
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* threads above). Upon completion of a single threaded invoke, the invoking thread
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* will be suspended once again. Note that any threads started during
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* the single threaded invocation will not be suspended when the
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* invocation completes.
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* <p>
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* If the target VM is disconnected during the invoke (for example, through
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* {@link VirtualMachine#dispose}) the method invocation continues.
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*
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* @param thread the thread in which to invoke.
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* @param method the {@link Method} to invoke.
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* @param arguments the list of {@link Value} arguments bound to the
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* invoked method. Values from the list are assigned to arguments
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* in the order they appear in the method signature.
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* @param options the integer bit flag options.
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* @return a {@link Value} mirror of the invoked method's return value.
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* @throws java.lang.IllegalArgumentException if the method is not
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* a member of this object's class, if the size of the argument list
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* does not match the number of declared arguemnts for the method,
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* if the method is a constructor or static intializer, or
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* if {@link #INVOKE_NONVIRTUAL} is specified and the method is
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* either abstract or an interface member.
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* @throws {@link InvalidTypeException} if any argument in the
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* argument list is not assignable to the corresponding method argument
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* type.
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* @throws ClassNotLoadedException if any argument type has not yet been loaded
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* through the appropriate class loader.
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* @throws IncompatibleThreadStateException if the specified thread has not
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* been suspended by an event.
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* @throws InvocationException if the method invocation resulted in
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* an exception in the target VM.
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* @throws InvalidTypeException If the arguments do not meet this requirement --
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* Object arguments must be assignment compatible with the argument
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* type. This implies that the argument type must be
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* loaded through the enclosing class's class loader.
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* Primitive arguments must be either assignment compatible with the
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* argument type or must be convertible to the argument type without loss
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* of information. See JLS section 5.2 for more information on assignment
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* compatibility.
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* @throws VMCannotBeModifiedException if the VirtualMachine is read-only - see {@link VirtualMachine#canBeModified()}.
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*/
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Value invokeMethod(ThreadReference thread, Method method,
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List<? extends Value> arguments, int options)
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throws InvalidTypeException,
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ClassNotLoadedException,
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IncompatibleThreadStateException,
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InvocationException;
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/**
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* Prevents garbage collection for this object. By default all
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* {@link ObjectReference} values returned by JDI may be collected
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* at any time the target VM is running. A call to this method
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* guarantees that the object will not be collected.
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* {@link #enableCollection} can be used to allow collection once
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* again.
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* <p>
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* Calls to this method are counted. Every call to this method
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* requires a corresponding call to {@link #enableCollection} before
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* garbage collection is re-enabled.
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* <p>
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* Note that while the target VM is suspended, no garbage collection
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* will occur because all threads are suspended. The typical
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* examination of variables, fields, and arrays during the suspension
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* is safe without explicitly disabling garbage collection.
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* <p>
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* This method should be used sparingly, as it alters the
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* pattern of garbage collection in the target VM and,
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* consequently, may result in application behavior under the
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* debugger that differs from its non-debugged behavior.
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* @throws VMCannotBeModifiedException if the VirtualMachine is read-only
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* -see {@link VirtualMachine#canBeModified()}.
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*/
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void disableCollection();
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/**
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* Permits garbage collection for this object. By default all
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* {@link ObjectReference} values returned by JDI may be collected
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* at any time the target VM is running. A call to this method
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* is necessary only if garbage collection was previously disabled
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* with {@link #disableCollection}.
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* @throws VMCannotBeModifiedException if the VirtualMachine is read-only
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* -see {@link VirtualMachine#canBeModified()}.
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*/
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void enableCollection();
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/**
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* Determines if this object has been garbage collected in the target
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* VM.
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*
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* @return <code>true</code> if this {@link ObjectReference} has been collected;
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* <code>false</code> otherwise.
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* @throws VMCannotBeModifiedException if the VirtualMachine is read-only
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* -see {@link VirtualMachine#canBeModified()}.
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*/
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boolean isCollected();
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/**
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* Returns a unique identifier for this ObjectReference.
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* It is guaranteed to be unique among all
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* ObjectReferences from the same VM that have not yet been disposed.
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* The guarantee applies as long
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* as this ObjectReference has not yet been disposed.
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*
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* @return a long unique ID
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*/
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long uniqueID();
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/**
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* Returns a List containing a {@link ThreadReference} for
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* each thread currently waiting for this object's monitor.
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* See {@link ThreadReference#currentContendedMonitor} for
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* information about when a thread is considered to be waiting
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* for a monitor.
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* <p>
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* Not all target VMs support this operation. See
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* VirtualMachine#canGetMonitorInfo to determine if the
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* operation is supported.
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*
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* @return a List of {@link ThreadReference} objects. The list
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* has zero length if no threads are waiting for the monitor.
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* @throws java.lang.UnsupportedOperationException if the
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* target VM does not support this operation.
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* @throws IncompatibleThreadStateException if any
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* waiting thread is not suspended
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* in the target VM
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*/
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List<ThreadReference> waitingThreads()
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throws IncompatibleThreadStateException;
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/**
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* Returns an {@link ThreadReference} for the thread, if any,
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* which currently owns this object's monitor.
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|
369 |
* See {@link ThreadReference#ownedMonitors} for a definition
|
|
370 |
* of ownership.
|
|
371 |
* <p>
|
|
372 |
* Not all target VMs support this operation. See
|
|
373 |
* VirtualMachine#canGetMonitorInfo to determine if the
|
|
374 |
* operation is supported.
|
|
375 |
*
|
|
376 |
* @return the {@link ThreadReference} which currently owns the
|
|
377 |
* monitor, or null if it is unowned.
|
|
378 |
*
|
|
379 |
* @throws java.lang.UnsupportedOperationException if the
|
|
380 |
* target VM does not support this operation.
|
|
381 |
* @throws IncompatibleThreadStateException if the owning thread is
|
|
382 |
* not suspended in the target VM
|
|
383 |
*/
|
|
384 |
ThreadReference owningThread() throws IncompatibleThreadStateException;
|
|
385 |
|
|
386 |
/**
|
|
387 |
* Returns the number times this object's monitor has been
|
|
388 |
* entered by the current owning thread.
|
|
389 |
* See {@link ThreadReference#ownedMonitors} for a definition
|
|
390 |
* of ownership.
|
|
391 |
* <p>
|
|
392 |
* Not all target VMs support this operation. See
|
|
393 |
* VirtualMachine#canGetMonitorInfo to determine if the
|
|
394 |
* operation is supported.
|
|
395 |
*
|
|
396 |
* @see #owningThread
|
|
397 |
* @return the integer count of the number of entries.
|
|
398 |
*
|
|
399 |
* @throws java.lang.UnsupportedOperationException if the
|
|
400 |
* target VM does not support this operation.
|
|
401 |
* @throws IncompatibleThreadStateException if the owning thread is
|
|
402 |
* not suspended in the target VM
|
|
403 |
*/
|
|
404 |
int entryCount() throws IncompatibleThreadStateException;
|
|
405 |
|
|
406 |
/**
|
|
407 |
* Returns objects that directly reference this object.
|
|
408 |
* Only objects that are reachable for the purposes of garbage collection
|
|
409 |
* are returned. Note that an object can also be referenced in other ways,
|
|
410 |
* such as from a local variable in a stack frame, or from a JNI global
|
|
411 |
* reference. Such non-object referrers are not returned by this method.
|
|
412 |
* <p>
|
|
413 |
* Not all target virtual machines support this operation.
|
|
414 |
* Use {@link VirtualMachine#canGetInstanceInfo()}
|
|
415 |
* to determine if the operation is supported.
|
|
416 |
*
|
|
417 |
* @see VirtualMachine#instanceCounts(List)
|
|
418 |
* @see ReferenceType#instances(long)
|
|
419 |
|
|
420 |
* @param maxReferrers The maximum number of referring objects to return.
|
|
421 |
* Must be non-negative. If zero, all referring
|
|
422 |
* objects are returned.
|
|
423 |
* @return a of List of {@link ObjectReference} objects. If there are
|
|
424 |
* no objects that reference this object, a zero-length list is returned..
|
|
425 |
* @throws java.lang.UnsupportedOperationException if
|
|
426 |
* the target virtual machine does not support this
|
|
427 |
* operation - see
|
|
428 |
* {@link VirtualMachine#canGetInstanceInfo() canGetInstanceInfo()}
|
|
429 |
* @throws java.lang.IllegalArgumentException if maxReferrers is less
|
|
430 |
* than zero.
|
|
431 |
* @since 1.6
|
|
432 |
*/
|
|
433 |
List<ObjectReference> referringObjects(long maxReferrers);
|
|
434 |
|
|
435 |
|
|
436 |
/**
|
|
437 |
* Compares the specified Object with this ObjectReference for equality.
|
|
438 |
*
|
|
439 |
* @return true if the Object is an ObjectReference, if the
|
|
440 |
* ObjectReferences belong to the same VM, and if applying the
|
|
441 |
* "==" operator on the mirrored objects in that VM evaluates to true.
|
|
442 |
*/
|
|
443 |
boolean equals(Object obj);
|
|
444 |
|
|
445 |
/**
|
|
446 |
* Returns the hash code value for this ObjectReference.
|
|
447 |
*
|
|
448 |
* @return the integer hash code
|
|
449 |
*/
|
|
450 |
int hashCode();
|
|
451 |
}
|