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Merge JDK 1.4 exception chaining support from classpath.

Browse Source 
* java/lang/Throwable.java: Merge 1.4 support from classpath.
	(stackTraceBytes): Rename from stackTrace.
	* java/lang/Exception.java: Merge from classpath.
	* java/lang/StackTraceElement: New file from classpath.
	* gcj/javaprims.h: Rebuild CNI namespace declarations.
	* Makefile.am: Add StackTraceElement.
	* Makefile.in: Rebuilt.

From-SVN: r53836
This commit is contained in:
Bryce McKinlay 2002-05-24 10:40:47 +00:00 committed by Bryce McKinlay
parent 7efda05490
commit 4fbecd2944
7 changed files with 732 additions and 68 deletions
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11
libjava/ChangeLog
View File

@ -1,3 +1,14 @@
2002-05-24 Bryce McKinlay <bryce@waitaki.otago.ac.nz>
Merge JDK 1.4 exception chaining support from classpath.
* java/lang/Throwable.java: Merge 1.4 support from classpath.
(stackTraceBytes): Rename from stackTrace.
* java/lang/Exception.java: Merge from classpath.
* java/lang/StackTraceElement: New file from classpath.
* gcj/javaprims.h: Rebuild CNI namespace declarations.
* Makefile.am: Add StackTraceElement.
* Makefile.in: Rebuilt.
2002-05-23 Bryce McKinlay <bryce@waitaki.otago.ac.nz>
* Makefile.am (all-recursive): Depend on $all_java_class_files so that

3
libjava/Makefile.am
View File

@ -1084,6 +1084,7 @@ java/lang/SecurityException.java \
java/lang/SecurityManager.java \
java/lang/Short.java \
java/lang/StackOverflowError.java \
java/lang/StackTraceElement.java \
java/lang/StrictMath.java \
java/lang/String.java \
java/lang/StringBuffer.java \
@ -1418,7 +1419,7 @@ gnu/java/security/provider/SHA1PRNG.java \
gnu/java/text/BaseBreakIterator.java \
gnu/java/text/CharacterBreakIterator.java \
gnu/java/text/LineBreakIterator.java \
gnu/java/text/SentenceBreakIterator.java \
gnu/java/text/SentenceBreakIterator.java \
gnu/java/text/WordBreakIterator.java \
gnu/java/util/DoubleEnumeration.java \
java/lang/ref/PhantomReference.java \

6
libjava/Makefile.in
View File

@ -851,6 +851,7 @@ java/lang/SecurityException.java \
java/lang/SecurityManager.java \
java/lang/Short.java \
java/lang/StackOverflowError.java \
java/lang/StackTraceElement.java \
java/lang/StrictMath.java \
java/lang/String.java \
java/lang/StringBuffer.java \
@ -1180,7 +1181,7 @@ gnu/java/security/provider/SHA1PRNG.java \
gnu/java/text/BaseBreakIterator.java \
gnu/java/text/CharacterBreakIterator.java \
gnu/java/text/LineBreakIterator.java \
gnu/java/text/SentenceBreakIterator.java \
gnu/java/text/SentenceBreakIterator.java \
gnu/java/text/WordBreakIterator.java \
gnu/java/util/DoubleEnumeration.java \
java/lang/ref/PhantomReference.java \
@ -2267,7 +2268,8 @@ DEP_FILES = .deps/$(srcdir)/$(CONVERT_DIR)/gen-from-JIS.P \
.deps/java/lang/Runtime.P .deps/java/lang/RuntimeException.P \
.deps/java/lang/RuntimePermission.P .deps/java/lang/SecurityException.P \
.deps/java/lang/SecurityManager.P .deps/java/lang/Short.P \
.deps/java/lang/StackOverflowError.P .deps/java/lang/StrictMath.P \
.deps/java/lang/StackOverflowError.P \
.deps/java/lang/StackTraceElement.P .deps/java/lang/StrictMath.P \
.deps/java/lang/String.P .deps/java/lang/StringBuffer.P \
.deps/java/lang/StringIndexOutOfBoundsException.P \
.deps/java/lang/System.P .deps/java/lang/Thread.P \

23
libjava/gcj/javaprims.h
View File

@ -193,6 +193,7 @@ extern "Java"
class SecurityManager;
class Short;
class StackOverflowError;
class StackTraceElement;
class StrictMath;
class String;
class String$CaseInsensitiveComparator;
@ -241,32 +242,43 @@ extern "Java"
{
class AbstractCollection;
class AbstractList;
class AbstractList$AbstractListItr;
class AbstractMap;
class AbstractSequentialList;
class AbstractSet;
class ArrayList;
class Arrays;
class Arrays$ArrayList;
class Arrays$ListImpl;
class BasicMapEntry;
class BitSet;
class Calendar;
class Collection;
class Collections;
class Collections$CopiesList;
class Collections$EmptyList;
class Collections$EmptyMap;
class Collections$EmptySet;
class Collections$ReverseComparator;
class Collections$SingletonList;
class Collections$SingletonMap;
class Collections$SingletonSet;
class Collections$SynchronizedCollection;
class Collections$SynchronizedIterator;
class Collections$SynchronizedList;
class Collections$SynchronizedListIterator;
class Collections$SynchronizedMap;
class Collections$SynchronizedMapEntry;
class Collections$SynchronizedRandomAccessList;
class Collections$SynchronizedSet;
class Collections$SynchronizedSortedMap;
class Collections$SynchronizedSortedSet;
class Collections$UnmodifiableCollection;
class Collections$UnmodifiableEntrySet;
class Collections$UnmodifiableIterator;
class Collections$UnmodifiableList;
class Collections$UnmodifiableListIterator;
class Collections$UnmodifiableMap;
class Collections$UnmodifiableRandomAccessList;
class Collections$UnmodifiableSet;
class Collections$UnmodifiableSortedMap;
class Collections$UnmodifiableSortedSet;
@ -288,10 +300,12 @@ extern "Java"
class Hashtable$HashEntry;
class Hashtable$HashIterator;
class IdentityHashMap;
class IdentityHashMap$IdentityEntry;
class IdentityHashMap$IdentityIterator;
class Iterator;
class LinkedHashMap;
class LinkedHashMap$LinkedHashEntry;
class LinkedHashSet;
class LinkedList;
class LinkedList$Entry;
class LinkedList$LinkedListItr;
@ -311,7 +325,9 @@ extern "Java"
class PropertyResourceBundle;
class Random;
class RandomAccess;
class RandomAccessSubList;
class ResourceBundle;
class ResourceBundle$Security;
class Set;
class SimpleTimeZone;
class SortedMap;
@ -329,12 +345,11 @@ extern "Java"
class TreeMap$Node;
class TreeMap$SubMap;
class TreeMap$TreeIterator;
class TreeMap$VerifyResult;
class TreeSet;
class Vector;
class WeakHashMap;
class WeakHashMap$Entry;
class WeakHashMap$WeakBucket;
class WeakHashMap$WeakEntry;
class WeakHashMap$WeakEntrySet;
namespace jar
{
@ -372,7 +387,7 @@ extern "Java"
class ZipOutputStream;
};
};
};
};
};
typedef struct java::lang::Object* jobject;

70
libjava/java/lang/Exception.java
View File

@ -1,6 +1,6 @@
/* Exception.java -- generic exception thrown to indicate an exceptional
condition has occurred.
Copyright (C) 1998, 1999, 2001 Free Software Foundation, Inc.
Copyright (C) 1998, 1999, 2001, 2002 Free Software Foundation, Inc.
This file is part of GNU Classpath.
@ -8,7 +8,7 @@ GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU Classpath 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
@ -39,40 +39,66 @@ exception statement from your version. */
package java.lang;
/* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3
* "The Java Language Specification", ISBN 0-201-63451-1
* plus online API docs for JDK 1.2 beta from http://www.javasoft.com.
* Status: Believed complete and correct.
*/
/**
* Exceptions may be thrown by one part of a Java program and caught
* by another in order to deal with the cause of the exception, such as
* The root class of all exceptions worth catching in a program. This
* includes the special category of <code>RuntimeException</code>, which
* does not need to be declared in a throws clause. Exceptions can be used
* to represent almost any exceptional behavior, such as programming errors,
* mouse movements, keyboard clicking, etc.
*
* @since JDK 1.0
*
* @author Brian Jones
* @author Warren Levy <warrenl@cygnus.com>
* @date September 18, 1998.
* @author Eric Blake <ebb9@email.byu.edu>
* @status updated to 1.4
*/
public class Exception extends Throwable
{
static final long serialVersionUID = -3387516993124229948L;
/**
* Compatible with JDK 1.0+.
*/
private static final long serialVersionUID = -3387516993124229948L;
/**
* Create an exception without a message.
* Create an exception without a message. The cause remains uninitialized.
*
* @see #initCause(Throwable)
*/
public Exception()
{
super();
}
{
}
/**
* Create an exception with a message.
* Create an exception with a message. The cause remains uninitialized.
*
* @param s the message
* @see #initCause(Throwable)
*/
public Exception(String s)
{
super(s);
}
{
super(s);
}
/**
* Create an exception with a message and a cause.
*
* @param s the message string
* @param cause the cause of this error
* @since 1.4
*/
public Exception(String s, Throwable cause)
{
super(s, cause);
}
/**
* Create an exception with a given cause, and a message of
* <code>cause == null ? null : cause.toString()</code>.
*
* @param cause the cause of this exception
* @since 1.4
*/
public Exception(Throwable cause)
{
super(cause);
}
}

259
libjava/java/lang/StackTraceElement.java Normal file
View File

@ -0,0 +1,259 @@
/* StackTraceElement.java -- One function call or call stack element
Copyright (C) 2001, 2002 Free Software Foundation, Inc.
This file is part of GNU Classpath.
GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU Classpath 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 for more details.
You should have received a copy of the GNU General Public License
along with GNU Classpath; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA.
Linking this library statically or dynamically with other modules is
making a combined work based on this library. Thus, the terms and
conditions of the GNU General Public License cover the whole
combination.
As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
modules, and to copy and distribute the resulting executable under
terms of your choice, provided that you also meet, for each linked
independent module, the terms and conditions of the license of that
module. An independent module is a module which is not derived from
or based on this library. If you modify this library, you may extend
this exception to your version of the library, but you are not
obligated to do so. If you do not wish to do so, delete this
exception statement from your version. */
package java.lang;
import java.io.Serializable;
/**
* One function call or stack trace element. Gives information about
* the execution point such as the source file name, the line number,
* the fully qualified class name, the method name and whether this method
* is native, if this information is known.
*
* @author Mark Wielaard <mark@klomp.org>
* @author Eric Blake <ebb9@email.byu.edu>
* @since 1.4
* @status updated to 1.4
*/
public class StackTraceElement implements Serializable
{
/**
* Compatible with JDK 1.4+.
*/
private static final long serialVersionUID = 6992337162326171013L;
/**
* The name of the file, null if unknown.
*
* @serial the source code filename, if known
*/
private final String fileName;
/**
* The line number in the file, negative if unknown.
*
* @serial the source code line number, if known
*/
private final int lineNumber;
/**
* The fully qualified class name, null if unknown.
*
* @serial the enclosing class, if known
*/
private final String className;
/**
* The method name in the class, null if unknown.
*
* @serial the enclosing method, if known
*/
private final String methodName;
/** Whether the method is native. */
private final transient boolean isNative;
/**
* A package local constructor for the StackTraceElement class, to be
* called by the Virtual Machine as part of Throwable.fillInStackTrace.
* There are no public constructors defined for this class. Creation
* of new elements is implementation specific.
*
* @param fileName the name of the file, null if unknown
* @param lineNumber the line in the file, negative if unknown
* @param className the fully qualified name of the class, null if unknown
* @param methodName the name of the method, null if unknown
* @param isNative true if native, false otherwise
*/
StackTraceElement(String fileName, int lineNumber, String className,
String methodName, boolean isNative)
{
this.fileName = fileName;
this.lineNumber = lineNumber;
this.className = className;
this.methodName = methodName;
this.isNative = isNative;
}
/**
* Returns the name of the file, or null if unknown. This is usually
* obtained from the <code>SourceFile</code> attribute of the class file
* format, if present.
*
* @return the file name
*/
public String getFileName()
{
return fileName;
}
/**
* Returns the line number in the file, or a negative number if unknown.
* This is usually obtained from the <code>LineNumberTable</code> attribute
* of the method in the class file format, if present.
*
* @return the line number
*/
public int getLineNumber()
{
return lineNumber;
}
/**
* Returns the fully qualified class name, or null if unknown.
*
* @return the class name
*/
public String getClassName()
{
return className;
}
/**
* Returns the method name in the class, or null if unknown. If the
* execution point is in a constructor, the name is
* <code>&lt;init&gt;</code>; if the execution point is in the class
* initializer, the name is <code>&lt;clinit&gt;</code>.
*
* @return the method name
*/
public String getMethodName()
{
return methodName;
}
/**
* Returns true if the method is native, or false if it is not or unknown.
*
* @return whether the method is native
*/
public boolean isNativeMethod()
{
return isNative;
}
/**
* Returns a string representation of this stack trace element. The
* returned String is implementation specific. This implementation
* returns the following String: "[class][.][method]([file][:line])".
* If the fully qualified class name or the method is unknown it is
* omitted including the point seperator. If the source file name is
* unknown it is replaced by "Unknown Source" if the method is not native
* or by "Native Method" if the method is native. If the line number
* is unknown it and the colon are omitted.
*
* @return a string representation of this execution point
*/
public String toString()
{
StringBuffer sb = new StringBuffer();
if (className != null)
{
sb.append(className);
if (methodName != null)
sb.append('.');
}
if (methodName != null)
sb.append(methodName);
sb.append('(');
if (fileName != null)
sb.append(fileName);
else
sb.append(isNative ? "Native Method" : "Unknown Source");
if (lineNumber >= 0)
sb.append(':').append(lineNumber);
sb.append(')');
return sb.toString();
}
/**
* Returns true if the given object is also a StackTraceElement and all
* attributes, except the native flag, are equal (either the same attribute
* between the two elments are null, or both satisfy Object.equals).
*
* @param o the object to compare
* @return true if the two are equal
*/
public boolean equals(Object o)
{
if (! (o instanceof StackTraceElement))
return false;
StackTraceElement e = (StackTraceElement) o;
return equals(fileName, e.fileName)
&& lineNumber == e.lineNumber
&& equals(className, e.className)
&& equals(methodName, e.methodName);
}
/**
* Returns the hashCode of this StackTraceElement. This implementation
* computes the hashcode by xor-ing the hashcode of all attributes except
* the native flag.
*
* @return the hashcode
*/
public int hashCode()
{
return hashCode(fileName) ^ lineNumber ^ hashCode(className)
^ hashCode(methodName);
}
/**
* Compare two objects according to Collection semantics.
*
* @param o1 the first object
* @param o2 the second object
* @return o1 == null ? o2 == null : o1.equals(o2)
*/
private static final boolean equals(Object o1, Object o2)
{
return o1 == null ? o2 == null : o1.equals(o2);
}
/**
* Hash an object according to Collection semantics.
*
* @param o the object to hash
* @return o1 == null ? 0 : o1.hashCode()
*/
private static final int hashCode(Object o)
{
return o == null ? 0 : o.hashCode();
}
}

428
libjava/java/lang/Throwable.java
View File

@ -1,21 +1,50 @@
// Throwable.java - Superclass for all exceptions.
/* java.lang.Throwable -- Reference implementation of root class for
all Exceptions and Errors
Copyright (C) 1998, 1999, 2002 Free Software Foundation, Inc.
/* Copyright (C) 1998, 1999 Free Software Foundation
This file is part of GNU Classpath.
This file is part of libgcj.
GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This software is copyrighted work licensed under the terms of the
Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
details. */
GNU Classpath 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 for more details.
You should have received a copy of the GNU General Public License
along with GNU Classpath; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA.
Linking this library statically or dynamically with other modules is
making a combined work based on this library. Thus, the terms and
conditions of the GNU General Public License cover the whole
combination.
As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
modules, and to copy and distribute the resulting executable under
terms of your choice, provided that you also meet, for each linked
independent module, the terms and conditions of the license of that
module. An independent module is a module which is not derived from
or based on this library. If you modify this library, you may extend
this exception to your version of the library, but you are not
obligated to do so. If you do not wish to do so, delete this
exception statement from your version. */
package java.lang;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.io.Serializable;
import java.io.OutputStreamWriter;
import java.io.OutputStream;
import java.io.FilterOutputStream;
import java.io.PrintWriter;
import java.io.PrintStream;
import java.io.ObjectOutputStream;
import java.io.ObjectInputStream;
import java.io.IOException;
import java.io.OutputStream;
/**
* @author Tom Tromey <tromey@cygnus.com>
@ -98,38 +127,341 @@ class CPlusPlusDemangler extends OutputStream
}
}
/**
* Throwable is the superclass of all exceptions that can be raised.
*
* <p>There are two special cases: {@link Error} and {@link RuntimeException}:
* these two classes (and their subclasses) are considered unchecked
* exceptions, and are either frequent enough or catastrophic enough that you
* do not need to declare them in <code>throws</code> clauses. Everything
* else is a checked exception, and is ususally a subclass of
* {@link Exception}; these exceptions have to be handled or declared.
*
* <p>Instances of this class are usually created with knowledge of the
* execution context, so that you can get a stack trace of the problem spot
* in the code. Also, since JDK 1.4, Throwables participate in "exception
* chaining." This means that one exception can be caused by another, and
* preserve the information of the original.
*
* <p>One reason this is useful is to wrap exceptions to conform to an
* interface. For example, it would be bad design to require all levels
* of a program interface to be aware of the low-level exceptions thrown
* at one level of abstraction. Another example is wrapping a checked
* exception in an unchecked one, to communicate that failure occured
* while still obeying the method throws clause of a superclass.
*
* <p>A cause is assigned in one of two ways; but can only be assigned once
* in the lifetime of the Throwable. There are new constructors added to
* several classes in the exception hierarchy that directly initialize the
* cause, or you can use the <code>initCause</code> method. This second
* method is especially useful if the superclass has not been retrofitted
* with new constructors:<br>
* <pre>
* try
* {
* lowLevelOp();
* }
* catch (LowLevelException lle)
* {
* throw (HighLevelException) new HighLevelException().initCause(lle);
* }
* </pre>
* Notice the cast in the above example; without it, your method would need
* a throws clase that declared Throwable, defeating the purpose of chainig
* your exceptions.
*
* <p>By convention, exception classes have two constructors: one with no
* arguments, and one that takes a String for a detail message. Further,
* classes which are likely to be used in an exception chain also provide
* a constructor that takes a Throwable, with or without a detail message
* string.
*
* <p>Another 1.4 feature is the StackTrace, a means of reflection that
* allows the program to inspect the context of the exception, and which is
* serialized, so that remote procedure calls can correctly pass exceptions.
*
* @author Brian Jones
* @author John Keiser
* @author Mark Wielaard
* @author Tom Tromey
* @author Eric Blake <ebb9@email.byu.edu>
* @since 1.0
* @status still missing 1.4 functionality
*/
public class Throwable implements Serializable
{
public native Throwable fillInStackTrace ();
/**
* Compatible with JDK 1.0+.
*/
private static final long serialVersionUID = -3042686055658047285L;
public String getLocalizedMessage ()
/**
* The detail message.
*
* @serial specific details about the exception, may be null
*/
private String detailMessage;
/**
* The cause of the throwable, including null for an unknown or non-chained
* cause. This may only be set once; so the field is set to
* <code>this</code> until initialized.
*
* @serial the cause, or null if unknown, or this if not yet set
* @since 1.4
*/
private Throwable cause = this;
/**
* The stack trace, in a serialized form.
*
* @serial the elements of the stack trace; this is non-null, and has
* no null entries
* @since 1.4
*/
// XXX Don't initialize this, once fillInStackTrace() does it.
private StackTraceElement[] stackTrace = {};
/**
* Instantiate this Throwable with an empty message. The cause remains
* uninitialized. {@link #fillInStackTrace()} will be called to set
* up the stack trace.
*/
public Throwable()
{
return getMessage ();
this((String) null);
}
public String getMessage ()
/**
* Instantiate this Throwable with the given message. The cause remains
* uninitialized. {@link #fillInStackTrace()} will be called to set
* up the stack trace.
*
* @param message the message to associate with the Throwable
*/
public Throwable(String message)
{
fillInStackTrace();
detailMessage = message;
}
/**
* Instantiate this Throwable with the given message and cause. Note that
* the message is unrelated to the message of the cause.
* {@link #fillInStackTrace()} will be called to set up the stack trace.
*
* @param message the message to associate with the Throwable
* @param cause the cause, may be null
* @since 1.4
*/
public Throwable(String message, Throwable cause)
{
this(message);
initCause(cause);
}
/**
* Instantiate this Throwable with the given cause. The message is then
* built as <code>cause == null ? null : cause.toString()</code>.
* {@link #fillInStackTrace()} will be called to set up the stack trace.
*
* @param cause the cause, may be null
* @since 1.4
*/
public Throwable(Throwable cause)
{
this(cause == null ? null : cause.toString(), cause);
}
/**
* Get the message associated with this Throwable.
*
* @return the error message associated with this Throwable, may be null
*/
public String getMessage()
{
return detailMessage;
}
public void printStackTrace ()
/**
* Get a localized version of this Throwable's error message.
* This method must be overridden in a subclass of Throwable
* to actually produce locale-specific methods. The Throwable
* implementation just returns getMessage().
*
* @return a localized version of this error message
* @see #getMessage()
* @since 1.1
*/
public String getLocalizedMessage()
{
printStackTrace (System.err);
return getMessage();
}
public void printStackTrace (PrintStream ps)
/**
* Returns the cause of this exception, or null if the cause is not known
* or non-existant. This cause is initialized by the new constructors,
* or by calling initCause.
*
* @return the cause of this Throwable
* @since 1.4
*/
public Throwable getCause()
{
PrintWriter writer = new PrintWriter (ps);
printStackTrace (writer);
return cause == this ? null : cause;
}
/**
* Initialize the cause of this Throwable. This may only be called once
* during the object lifetime, including implicitly by chaining
* constructors.
*
* @param cause the cause of this Throwable, may be null
* @return this
* @throws IllegalArgumentException if cause is this (a Throwable can't be
* its own cause!)
* @throws IllegalStateException if the cause has already been set
* @since 1.4
*/
public Throwable initCause(Throwable cause)
{
if (cause == this)
throw new IllegalArgumentException();
if (this.cause != this)
throw new IllegalStateException();
this.cause = cause;
return this;
}
/**
* Get a human-readable representation of this Throwable. The detail message
* is retrieved by getLocalizedMessage(). Then, with a null detail
* message, this string is simply the object's class name; otherwise
* the string is <code>getClass().getName() + ": " + message</code>.
*
* @return a human-readable String represting this Throwable
*/
public String toString()
{
String msg = getLocalizedMessage();
return getClass().getName() + (msg == null ? "" : ": " + msg);
}
/**
* Print a stack trace to the standard error stream. This stream is the
* current contents of <code>System.err</code>. The first line of output
* is the result of {@link #toString()}, and the remaining lines represent
* the data created by {@link #fillInStackTrace()}. While the format is
* unspecified, this implementation uses the suggested format, demonstrated
* by this example:<br>
* <pre>
* public class Junk
* {
* public static void main(String args[])
* {
* try
* {
* a();
* }
* catch(HighLevelException e)
* {
* e.printStackTrace();
* }
* }
* static void a() throws HighLevelException
* {
* try
* {
* b();
* }
* catch(MidLevelException e)
* {
* throw new HighLevelException(e);
* }
* }
* static void b() throws MidLevelException
* {
* c();
* }
* static void c() throws MidLevelException
* {
* try
* {
* d();
* }
* catch(LowLevelException e)
* {
* throw new MidLevelException(e);
* }
* }
* static void d() throws LowLevelException
* {
* e();
* }
* static void e() throws LowLevelException
* {
* throw new LowLevelException();
* }
* }
* class HighLevelException extends Exception
* {
* HighLevelException(Throwable cause) { super(cause); }
* }
* class MidLevelException extends Exception
* {
* MidLevelException(Throwable cause) { super(cause); }
* }
* class LowLevelException extends Exception
* {
* }
* </pre>
* <p>
* <pre>
* HighLevelException: MidLevelException: LowLevelException
* at Junk.a(Junk.java:13)
* at Junk.main(Junk.java:4)
* Caused by: MidLevelException: LowLevelException
* at Junk.c(Junk.java:23)
* at Junk.b(Junk.java:17)
* at Junk.a(Junk.java:11)
* ... 1 more
* Caused by: LowLevelException
* at Junk.e(Junk.java:30)
* at Junk.d(Junk.java:27)
* at Junk.c(Junk.java:21)
* ... 3 more
* </pre>
*/
public void printStackTrace()
{
printStackTrace(System.err);
}
/**
* Print a stack trace to the specified PrintStream. See
* {@link #printStackTrace()} for the sample format.
*
* @param s the PrintStream to write the trace to
*/
public void printStackTrace(PrintStream s)
{
printStackTrace(new PrintWriter(s));
}
/**
* Print a stack trace to the specified PrintWriter. See
* {@link #printStackTrace()} for the sample format.
*
* @param w the PrintWriter to write the trace to
* @since 1.1
*/
public void printStackTrace (PrintWriter wr)
{
try
{
CPlusPlusDemangler cPlusPlusFilter = new CPlusPlusDemangler (wr);
PrintWriter writer = new PrintWriter (cPlusPlusFilter);
printRawStackTrace (writer);
printRawStackTrace (writer);
writer.close ();
if (cPlusPlusFilter.written == 0) // The demangler has failed...
printRawStackTrace (wr);
@ -140,32 +472,50 @@ public class Throwable implements Serializable
}
}
public Throwable ()
/**
* Fill in the stack trace with the current execution stack.
*
* @return this same throwable
* @see #printStackTrace()
*/
public native Throwable fillInStackTrace();
/**
* Provides access to the information printed in {@link #printStackTrace()}.
* The array is non-null, with no null entries, although the virtual
* machine is allowed to skip stack frames. If the array is not 0-length,
* then slot 0 holds the information on the stack frame where the Throwable
* was created (or at least where <code>fillInStackTrace()</code> was
* called).
*
* @return an array of stack trace information, as available from the VM
* @since 1.4
*/
public StackTraceElement[] getStackTrace()
{
detailMessage = null;
fillInStackTrace ();
return stackTrace;
}
public Throwable (String message)
/**
* Change the stack trace manually. This method is designed for remote
* procedure calls, which intend to alter the stack trace before or after
* serialization according to the context of the remote call.
*
* @param stackTrace the new trace to use
* @throws NullPointerException if stackTrace is null or has null elements
* @since 1.4
*/
public void setStackTrace(StackTraceElement[] stackTrace)
{
detailMessage = message;
fillInStackTrace ();
}
public String toString ()
{
return ((detailMessage == null)
? getClass().getName()
: getClass().getName() + ": " + getMessage ());
for (int i = stackTrace.length; --i >= 0; )
if (stackTrace[i] == null)
throw new NullPointerException();
this.stackTrace = stackTrace;
}
private native final void printRawStackTrace (PrintWriter wr);
// Name of this field comes from serialization spec.
private String detailMessage;
// Setting this flag to false prevents fillInStackTrace() from running.
static boolean trace_enabled = true;
private transient byte stackTrace[];
private static final long serialVersionUID = -3042686055658047285L;
private transient byte stackTraceBytes[];
}