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67 lines
2.7 KiB
HTML
67 lines
2.7 KiB
HTML
<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<meta name="Author" content="Norris Boyd">
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<meta name="GENERATOR" content="Mozilla/4.51 [en] (WinNT; U) [Netscape]">
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<title>Small Footprint</title>
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</head>
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<body bgcolor="#FFFFFF">
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<center>
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<h1>
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Small Footprint</h1></center>
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A few changes can be made to reduce the footprint of Rhino for embeddings
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where space is at a premium. On a recent build, the length of js.jar was 603,127 bytes corresponding to 1,171,708 bytes of all uncompressed Rhino classes with debug information included.
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With various changes js.jar size can be reduced to 204,689 bytes corresponding to 424,774 bytes of uncompressed classes.
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<h3>Tools</h3>
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<p>
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Most embeddings won't need any of the classes in <tt>org.mozilla.javascript.tools</tt> or any of its sub-packages.
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<h3>
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Optimizer</h3>
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<p>
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It is possible to run Rhino with interpreter mode only, allowing you to remove
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code for classfile generation that include all the classes from
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<tt>org.mozilla.javascript.optimizer</tt> package.
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<h3>JavaAdapter</h3>
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<p>
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Implementing the JavaAdapter functionality requires the ability to generate
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classes on the fly. Removing <tt>org.mozilla.javascript.JavaAdapter</tt> will disable this functionality, but Rhino will otherwise run correctly.
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<h3>Class generation library</h3>
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<p>
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If you do not include Optimizer or JavaAdapter, then you do not need Rhino library for class file generation and you can remove all the classes from in <tt>org.mozilla.classfile</tt> package.
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<h3>Regular Expressions</h3>
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<p>
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The package <tt>org.mozilla.javascript.regexp</tt> can be removed. Rhino
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will continue to run, although it will not be able to execute any regular
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expression matches. This change saves 47,984 bytes of class files.
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<h3>Debug information</h3>
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<p>
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Debug information in Rhino classes consumes about 25% of code size and if you can live without that, you can recompile Rhino to remove it.
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<h2>smalljs.jar</h2>
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<p>
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Ant build script in Rhino supports smalljar target that will generate
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smalljs.jar that does not include Tools, Optimizer, JavaAdapter and Class
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generation library, Regular Expressions, E4X implementataion and deprecated
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files. To build such minimalist jar without debug information, run the
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following command from the top directory of Rhino distribution:
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<pre>
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ant clean
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ant -Ddebug=off -Dno-regexp=true -Dno-e4x=true smalljar
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</pre>
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If you omit <tt>-Dno-regexp=true</tt>, then the resulting smalljs.jar will
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include Regular Expression support. Similarly omitting <tt>-Dno-e4x=true</tt>
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results in smalljs.jar that includes runtime support for E4X.
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<p>
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<hr WIDTH="100%">
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<br><a href="index.html">back to top</a>
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</body>
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</html>
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