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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
<html> <head>
<title>AspectJ 1.2 Readme</title>
<style type="text/css">
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<div align="right"><small>
© Copyright 2003,2004 Contributors.
All rights reserved.
</small></div>
<h1>AspectJ 1.2 Readme</h1>
<p> The definition of the AspectJ language is unchanged in the 1.2 release.
Instead, AspectJ 1.2 provides major improvements to the functionality of the
supporting tools
and enforces some language limits that went unchecked before.
This document describes the tools differences between
AspectJ versions 1.2 and 1.1.1.
Users new to AspectJ need only read
the <a href="progguide/index.html">AspectJ Programming Guide</a>
since it describes the 1.2 language.
Users familiar with AspectJ 1.1 may find this document
a quicker way to learn what changed in the tools,
and should use it as a guide for porting
programs from 1.1 to 1.2,
together with <a href="porting.html">porting.html</a>.
</p>
<p>This document first summarizes changes from the 1.1.1 release in
</p>
<ul>
<li><a href="#compiler">the compiler</a>,</li>
<li><a href="#tools">the support tools</a>,</li>
<li><a href="#runtime">the runtime</a>,</li>
<li><a href="#devenv">the development environment support</a>,</li>
</ul>
<p> then <a href="#details">details</a> some of the changes,
and finally points readers to the bug database for
<a href="#allchanges">all the changes</a>.
</p>
<!-- ============================== -->
<!-- ============================== -->
<hr>
<h2><a name="compiler">The Compiler</a></h2>
Compared to AspectJ 1.1.1, the AspectJ 1.2 compiler...
<ul>
<li><a href="#WEAVE_TIME">Is faster</a>, with weaving completing in less than half the time it
used to take in many cases.
<a name="WEAVE_CHART"><img src="images/AspectJ11v12.JPG"></img></a>.</li>
<li>Supports the <a href="#LAZY_TJP">-XlazyTjp option</a> which produces code that runs
faster and uses less memory in some common cases.</li>
<li>Has <a href="#INCREMENTAL">much better support for incremental compilation</a>.</li>
<li>Produces <a href="#ERROR_MESSAGES">better error messages</a>.</li>
<li>Has some <a href="#LINT">new lint warnings</a> to catch common mistakes and changes to serializability.</li>
<li>Supports the <a href="#REWEAVABLE">-Xreweavable option</a> that allows classes to be woven more
than once.<li>
<li>Supports the <a href="#INPATH">-inpath option</a> which allows both directories and jars
containing class files to be specified as input to the weaver.</li>
<li><a href="#COMPLIANCE">Changes the default compiler compliance mode</a> from -1.3 to -1.4.
</ul>
<p> A short description of the options ajc accepts is available with
"<code>ajc -help</code>".
Longer descriptions are available in the
<a href="devguide/ajc-ref.html">Development Environment Guide
section on ajc</a>. </p>
<p> </p>
<!-- ============================== -->
<hr>
<h2><a name="tools">Support Tools</a></h2>
<p>AspectJ 1.2 contains two important changes to the supporting tools:</p>
<ul>
<li><a href="#AJDOC">ajdoc</a> is back<li>A sample script is supplied for <a href="#LTW">load-time weaving</a> from the command-line.
</ul>
<!-- ============================== -->
<hr>
<h2><a name="runtime">The Runtime Library</a></h2>
<p>This release has minor updates to the runtime library classes.
As with any release, you should compile and run with the runtime
library that came with your compiler, and you may run with
a later version of the library without recompiling your code.</p>
<ul>
<li><a href="#SOFTEX"><code>SoftException</code></a> now supports <code>getCause()</code>.</li>
<li>Although not part of <code>aspectjrt.jar</code> this release also provides a new set of
tools APIs in the <a href="#LTW2"><code>org.aspectj.weaver.tools</code></a> that provide a weaving class loader
and an adapter that can be used to integrate load-time weaving into an existing class loader
hierarchy.</li>
<li>Cflow stack management has been modified to use thread local storage on JVMs that support this feature.
This improves performance in terms of heap usage for multi-threaded applications that use cflow.
</ul>
<!-- ============================== -->
<hr>
<h2><a name="devenv">The AJDE Tools</a></h2>
<p> The AJDE based tools for JBuilder, NetBeans and Emacs continue to be independent
SourceForge projects. The AspectJ 1.2 distribution includes an updated version of the
AjBrowser tool that benefits from all the enhancements made in the 1.2 compiler.</p>
<p>The 1.2 release of AspectJ also lays a lot of the groundwork for a much better AspectJ
IDE experience that we hope to surface initially through AJDT (AspectJ support
for Eclipse). Amongst the many improvements, we
will have full eager parsing support that avoids the need to keep the whole structure
model of a project in memory, hopefully making AJDT much less memory hungry and much
slicker to use. For more details see the <a href="http://www.eclipse.org/ajdt">
AJDT project website</a>.
<!-- ============================== -->
<hr>
<h2><a name="details">Details</a> of some compiler changes</h2>
<h3><a name="WEAVE_TIME">Compilation (weave) times reduced.</a></h3>
<p>Our benchmark suite shows that AspectJ 1.2 is at least twice as fast in the
weaving phase as AspectJ 1.1.1 for matches based on a variety of pointcut expressions
(see the <a href="#WEAVE_CHART">chart above</a>). We've also made the base
incremental compilation implementation in AspectJ 1.2 approximately twice as fast
as in AspectJ 1.1.1, so when this is combined with the weave time improvements you
should see speed-ups of up to 4x for incremental compilation.</p>
<p>In addition, AspectJ 1.2 maintains only weak references to some of its recoverable data structures,
allowing the JVM to optimise between performance and memory usage. Experiments forcing GC
showed that we can achieve about a 20% memory usage reduction in this manner if needed.</p>
<h3><a name="LAZY_TJP">The -XlazyTjp option.</a></h3>
<p>Under AspectJ 1.1.1, if the body of an advice contained a reference to a
non-statically determinable portion of <code>thisJoinPoint</code> (such as for example a call
to <code>getArgs()</code>), then a JoinPoint object was always creating before entering the advice.
This was the case even if the advice was guarded with an <code>if()</code> pointcut that
evaluated to false. </p>
<p>AspectJ 1.2 now supports the <code>-XlazyTjp</code> option that only creates the JoinPoint object just
before dispatching to the advice body. By promoting the guard to a test in an <code>if()</code> pointcut,
the creation of the JoinPoint object can be avoided altogether in the case where the test returns false.</p>
<p>Consider a simple tracing aspect as follows:</p>
<pre>
public aspect Tracing {
public static boolean enabled = false;
pointcut toBeTraced() : execution(* *(..)) || execution(new(..));
before() : toBeTraced() && if(enabled) {
Object[] args = thisJoinPoint.getArgs();
// format args and print out entry trace record etc....
}
}
</pre>
<p> The most important consideration is the system overhead when tracing is turned off. Using the
<code>-XlazyTjp</code> option makes the program above run 10-100x faster, even when running a
small test case with minimal GC issues. The optimization is disabled at join points advised by
around advice, and an Xlint warning will be displayed in these cases.
</p>
<h3><a name="INCREMENTAL">Improvements to incremental compilation.</a></h3>
<p>AspectJ 1.2 provides more complete incremental compilation support than AspectJ 1.1.1.
Firstly, incremental compilation resulting from a change to a source file is now approximately
twice as fast as it was under 1.1.1 (even before taking the improvements to weaving time into
account). Secondly, the incremental coverage now takes into account changes to resources, classes and jars
on the inpath, injars, and aspectpath. The new <code>inpath</code> option in AspectJ 1.2 allows
directories to be specified in addition to jars (just like a classpath) as input to the weaver. Any update, addition
or deletion of a class file in a directory on the inpath will cause incremental (re)weaving.
<p>Changes to a jar file on the inpath, injars or aspectpath will now be detected, but will trigger a
full rebuild, as will any change to the paths used to control compilation.</p>
<h3><a name="ERROR_MESSAGES">Improved error messages.</a></h3>
<p>AspectJ 1.1.1 did not provide source context information for messages produced during the weaving phase,
even in the case where source files were passed to the compiler. For example, an error message arising as
a result of a <code>declare error</code> statement might look as follows under AspectJ 1.1.1: </p>
<font color="red">
<pre>
BadClass.java:6 should not be calling bad methods
</pre>
</font>
<p>whereas in AspectJ 1.2 you will see:</p>
<font color="red">
<pre>
BadClass.java:6 error should not be calling bad methods
new C().bad();
^^^^^^^^^^^^^^
method-call(void C.bad())
see also: DeclareError.java:5
</pre>
</font>
<p>There are four new things to note about this error message. Firstly, errors and
warnings are now prefixed with the word "error", or "warning" as appropriate.
Secondly, the offending line of source is shown if source code is available. Thirdly,
in the case of weaver messages arising as a result of <code>declare error</code> and
<code>declare warning</code> statements, AspectJ now shows not only the location of the
error or warning, but also the location of the <code>declare</code> statement itself.
Finally, note that messages produced as a result of <code>declare error</code> and
<code>declare warning</code> statements now also display the matched join point at the
location of the error:</p>
<p>When source code is not available, the messages show the binary input source (class
file or jar file) in which the error or warning was detected: </p>
<font color="red">
<pre>
BadClass.java:6 error should not be calling bad methods
(no source information available)
method-call(void C.bad())
see also: C:\...\DeclareError.java:5
see also: C:\...\bin-input.jar
</pre>
</font>
<p>This error message tells us that <code>BadClass.class</code> contained in a jar on the inpath called <code>bin-input.jar</code>,
and originally compiled from a source file called <code>BadClass.java</code>, contains a join point
(<code>method-call(void C.bad())</code> matched by a <code>declare error</code> statement on line 5 of the file
<code>DeclareError.java</code>.
<h3><a name="LINT">New lint warnings.</a></h3>
<p>Consider the program:</p>
<pre>
<code>
01 class A {
02 public void doIt() {...};
03 }
04
05 class B extends A {
06 public void doThisToo() {...};
07 }
08
09
10 public class CallsAandB {
11
12 public static void main(String[] args) {
13 B b = new B();
14 A bInDisguise = new B();
15
16 b.doIt(); // AspectJ 1.2 matches here
17 bInDisguise.doIt(); // this is never matched
18 }
19
20 }
21
22 aspect CallPCDMatchingExample {
23
24 before() : call(* B.doIt(..)) {
25 System.out.println("About to call B.doIt(...)");
26 }
27
28 }
</code>
</pre>
<p>Because the static type of <code>bInDisguise</code> is <code>A</code> (line 14), the call on line
17 is never matched by the pointcut expression on 24, even though the runtime type of
<code>bInDisguise</code> is <code>B</code>. Type patterns matched in <code>call</code> pointcut
designators are matched based on static type matching. Some users have found
this static type matching confusing, and AspectJ 1.2 has a new Xlint warning
(<code><b>unmatchedSuperTypeInCall</b></code>) which is enabled by default.</p>
<p>The compiler will now produce a warning whenever a call pointcut designator does not match at a
join point, and a user may have expected it to. Compiling the above program using AspectJ 1.2
produces the following compiler output:</p>
<pre>
<code>
<font color="red">
CallsAandB.java:24 warning does not match because declaring type is A, if match desired use target(B) [Xlint:unmatchedSuperTypeInCall]
before() : call(* B.doIt(..)) {
^^^^^^^^^^^^^^^
see also: CallsAandB.java:17
</font>
<font color="blue">
1 warning
</font>
</code>
</pre>
<p> The warning is telling us that the call pointcut associated with the before advice on line 24
of the source file does not match at a join point where the user may have expected it to. The source
location corresponding to the unmatched join point is indicated by the "see also" line - in this case
line 17 of the source file. At line 17 we find a call to <code>bInDisguise.doIt()</code>. Since the
static type of <code>bInDisguise</code> is <code>A</code>, this call will never be matched.
The warning also tells us a possible solution if we intended the pointcut to match at this join point: use
<code>call(* doIt(..) && target(B)</code>.</p>
<p>If you find warnings of this kind coming out when you use the AspectJ 1.2 compiler, the recommended fix is to
switch to using the <code>target</code> designator in place of a type pattern in the <code>call</code> pointcut
expression. Note that there is no loss of runtime efficiency here - runtime tests are only added in the cases
where it cannot be determined at compile time whether the type of the receiver will match the type specified in
the <code>target</code> expression. Also note that <code>target</code> cannot be used in <code>declare</code> statements.
</p>
<p>A new Xlint warning, <code><b>needsSerialVersionUIDField</b></code> (disabled by default) will produce a
warning at compile time if the process of weaving changes the default <code>serialVersionUID</code> of
a serializable class, and the class does not define a <code>serialVersionUID</code>. By defining a
<code>serialVersionUID</code> field, the programmer can ensure that objects serialized without the aspect
present can be read by a version of the program in which the aspect is present, and vice-versa.</p>
<p>A complimentary Xlint warning, <code><b>brokeSerialVersionCompatibility</b></code> (disabled by default) will
produce a warning at compile time if the process of weaving makes an incompatible change to a serializable
class (for example, through the addition of an inter-type declared field).
<h3><a name="REWEAVABLE">The -Xreweavable option.</a></h3>
<p>The new <code>-Xreweavable</code> option produces class files that contain enough additional information in
them that they can be rewoven. In time we hope that this can become a standard option, replacing the current
<code>-Xnoweave</code> option. Using reweavable produces class files that can be legally loaded by a JVM, whereas
with noweave, it is too easy to produce class files that will result in a verify error at runtime. The reweavable
option makes it easy to weave code many times without having to decide which weave is the final one. In a future version
of the AspectJ compiler, producing reweavable class files may become the default option. The trade-off at the moment is that
reweavable class files are currently approximately twice the size of their non-reweavable counterparts.
<p>To ensure consistent semantics when reweaving, the AspectJ compiler requires that all aspects that have previously
modified a class file during weaving be present in the system during a reweave. An error will be issued if any are
missing.
<h3><a name="INPATH">The -inpath option.</a></h3>
<p>The new <code>-inpath</code> option replaces the <code>-injars</code> option (which is still supported
for backwards compatibility). It allows both directories and jar files to be specified using path separators
to separate entries in the path. This option makes it easy for class files produced as the result of building
one project to become binary input to the compilation of a second project.
<h3><a name="COMPLIANCE">The default compliance mode of the compiler has changed from -1.3 to -1.4.</a></h3>
<p>The default AspectJ compiler compliance level is now 1.4 (whereas in
previous releases the default compliance level was 1.3). This has a number
of implications:
<ul>
<li> class files generated by the compiler are now JRE v1.2 and upwards
compatible. (At compliance level 1.3, AspectJ generated class files that
were compatible with JRE 1.1 also).
<li> <code>call</code> pointcuts may match more join points than in the same
program compiled at compliance level 1.3.
</ul>
<p>The AspectJ compiler can be restored to 1.3 compliance settings by specifying the
"-1.3" option on the command-line.
</p>
<p>Consider again the following example program which illustrates the differences in join point matching
with the <code>call</code> pointcut designator between 1.4 and 1.3 compliance levels.
<pre>
<code>
01 class A {
02 public void doIt() {...};
03 }
04
05 class B extends A {
06 public void doThisToo() {...};
07 }
08
09
10 public class CallsAandB {
11
12 public static void main(String[] args) {
13 B b = new B();
14 A bInDisguise = new B();
15
16 b.doIt(); // AspectJ 1.2 matches here
17 bInDisguise.doIt(); // this is never matched
18 }
19
20 }
21
22 aspect CallPCDMatchingExample {
23
24 before() : call(* B.doIt(..)) {
25 System.out.println("About to call B.doIt(...)");
26 }
27
28 }
</code>
</pre>
<p>When this program is compiled with AspectJ 1.2 using the default compiler options,
it will produce one line of output when it is executed:</p>
<p><code>About to call B.doIt(...)</code></p>
<p>The same program compiled under AspectJ 1.1 (or using AspectJ 1.2 with the -1.3 flag specified)
does not produce any output when it is run. The reason for the additional call pcd match is that
prior to compliance level 1.4, Java compilers produced bytecodes that call A.doIt() (the defining type of the method),
rather than B.doIt() (the declared type in the program text). The generated call to
A.doIt() is not matched by the call pcd used in the before advice. At
compliance level 1.4, the bytecodes retain the declared type of the receiver in the
program source, generating a call to B.doIt(), which <i>is</i> matched by the call pcd.
<p>This is a good example of why the recommended style is to use <code>call(* doIt(..)) && target(B)</code>,
which always matches based on the actual type of the receiver.
<!-- ============================== -->
<hr>
<h3><a name="AJDOC">The ajdoc tool makes a comeback in the AspectJ 1.2 distribution.</a></h3>
<p><code>ajdoc</code> (the AspectJ replacement for the <code>javadoc</code> tool) is once again included in
the AspectJ distribution. The <code>ajdoc</code> tool produces regular javadoc that also shows advises and
advised by relationships next to methods and advice. A future enhancement will show inter-type declarations
in the target class too. </p>
<p><b>Known limitations: </b>Please note that <code>ajdoc</code> documents
advice and pointcut members, shows where advice applies and links affected
members back to the advice. It currently does not document or add
structural links for any inter-type declarations or other declare forms.</p>
<p>Run the "ajdoc.bat" script just
as you run javadoc. For a list of accepted parameters run "ajdoc
-help". For example, to document everything in the Spacewar example
run:<br>
<tt>> cd examples<br>
> ajdoc -d doc -private spacewar coordination</tt></p>
<p><code>ajdoc</code> sample output for an aspect source file:</p>
<p><img src="images/ajdoc1.JPG"/></p>
<p><code>ajdoc</code> sample output for advised methods:</p>
<p><img src="images/ajdoc2.JPG"/></p>
<h3><a name="LTW">A sample script is supplied that supports load-time weaving from the command-line</a></h3>
<p>The AspectJ 1.2 distribution ships with sample scripts for Windows and Unix platforms that exploit AspectJ's
binary weaving capabilities at application load time. You will find these scripts in the
<code>doc/examples/ltw</code> directory of your AspectJ installation. </p>
<p>The scripts allow you to set an environment variable, <code>ASPECTPATH</code>, containing a path-separator
delimited list of aspect-library jar files. A Java application can then be launched using the "<code>aj</code>"
script ("<code>aj</code>" is to "<code>ajc</code>" as "<code>java</code>" is to "<code>javac</code>"). If the
<code>ASPECTPATH</code> is unset or empty, "<code>aj</code>" behaves exactly the same as "<code>java</code>",
but if the <code>ASPECTPATH</code> contains one or more aspect libraries, the aspects in the library will be
linked (woven) with the application code as it is loaded.<p>
<p>The <code>doc/examples/ltw</code> directory of your AspectJ installation contains a sample application that
demonstrates these capabilities. Following the instructions in the <code>README</code> file in that directory,
running "<code>aj tracing.ExampleMain</code>" with <code>ASPECTPATH</code> unset produces the output:</p>
<font color="blue">
<pre>
c1.perimeter() = 12.566370614359172
c1.area() = 12.566370614359172
s1.perimeter() = 4.0
s1.area() = 1.0
c2.distance(c1) = 4.242640687119285
s1.distance(c1) = 2.23606797749979
s1.toString(): Square side = 1.0 @ (1.0, 2.0)
</pre>
</font>
<p>If you set <code>ASPECTPATH</code> to include <code>../jars/tracingLib.jar</code>, and run
"<code>aj tracing.ExampleMain</code>" again, the output will be:</p>
<font color="blue">
<pre>
--> tracing.TwoDShape(double, double)
<-- tracing.TwoDShape(double, double)
--> tracing.Circle(double, double, double)
<-- tracing.Circle(double, double, double)
--> tracing.TwoDShape(double, double)
<-- tracing.TwoDShape(double, double)
--> tracing.Circle(double, double, double)
<-- tracing.Circle(double, double, double)
--> tracing.Circle(double)
<-- tracing.Circle(double)
--> tracing.TwoDShape(double, double)
<-- tracing.TwoDShape(double, double)
--> tracing.Square(double, double, double)
<-- tracing.Square(double, double, double)
--> tracing.Square(double, double)
<-- tracing.Square(double, double)
--> double tracing.Circle.perimeter()
<-- double tracing.Circle.perimeter()
c1.perimeter() = 12.566370614359172
--> double tracing.Circle.area()
<-- double tracing.Circle.area()
c1.area() = 12.566370614359172
--> double tracing.Square.perimeter()
<-- double tracing.Square.perimeter()
s1.perimeter() = 4.0
--> double tracing.Square.area()
<-- double tracing.Square.area()
s1.area() = 1.0
--> double tracing.TwoDShape.distance(TwoDShape)
--> double tracing.TwoDShape.getX()
<-- double tracing.TwoDShape.getX()
--> double tracing.TwoDShape.getY()
<-- double tracing.TwoDShape.getY()
<-- double tracing.TwoDShape.distance(TwoDShape)
etc...
</pre>
</font>
<p>The scripts only support JDK 1.4 and above - attempting to use them with a 1.3 or lower JDK will most
likely produce <code>NoClassDefFound</code> errors. We welcome contributions from users to improve these
scripts.</p>
<!-- ============================== -->
<hr/>
<h3><a name="SOFTEX">SoftException now supports getCause()</a></h3>
<p><code>org.aspectj.lang.SoftException</code> now supports the <code>getCause()</code> method, which returns the
original exception wrapped by the <code>SoftException</code>. This means that exception chains will print correctly
on 1.4 and later JREs.
<h3><a name="LTW2">org.aspectj.weaver.tools package added</a></h3>
<p>A new set of public APIs are exported by the
<a href="api/index.html"><code>org.aspectj.weaver.tools</code></a> package that can be used
to integrate load-time weaving into an existing class loader hierachy. The package implementation
is included in <code>aspectjtools.jar</code>. For an example of how to use these APIs, see the
<code>org.aspectj.weaver.WeavingURLClassLoader</code> implementation.
<hr/>
<a name="allchanges"></a>
<h2>All changes are listed in the bug database</h2>
For a complete list of changes in the 1.2 release, search for
<code>target 1.2</code> in the bug database:
<a href="https://bugs.eclipse.org/bugs/buglist.cgi?product=AspectJ&component=Compiler&target_milestone=1.2">
https://bugs.eclipse.org/bugs/buglist.cgi?product=AspectJ&component=Compiler&target_milestone=1.2
</a>
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