| <!doctype html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> |
| <html> |
| <head> |
| <meta http-equiv="content-type" content="text/html; charset=iso-8859-1"> |
| <meta http-equiv="content-style-type" content="text/css"> |
| <link rel="stylesheet" type="text/css" href="style.css"> |
| <title>ProGuard Limitations</title> |
| </head> |
| <body> |
| |
| <script type="text/javascript" language="JavaScript"> |
| <!-- |
| if (window.self==window.top) |
| document.write('<a class="largebutton" target="_top" href="../index.html#manual/limitations.html">ProGuard index</a> <a class="largebutton" target="_top" href="http://www.guardsquare.com/dexguard">DexGuard</a> <a class="largebutton" target="_top" href="http://www.guardsquare.com/">GuardSquare</a> <a class="largebutton" target="other" href="http://sourceforge.net/projects/proguard/">Sourceforge</a>') |
| //--> |
| </script> |
| <noscript> |
| <a class="largebutton" target="_top" href="../index.html#manual/limitations.html">ProGuard index</a> |
| <a class="largebutton" target="_top" href="http://www.guardsquare.com/dexguard">DexGuard</a> |
| <a class="largebutton" target="_top" href="http://www.guardsquare.com/">GuardSquare</a> |
| <a class="largebutton" target="other" href="http://sourceforge.net/projects/proguard/">Sourceforge</a> |
| </noscript> |
| |
| <h2>Limitations</h2> |
| |
| When using ProGuard, you should be aware of a few technical issues, all of |
| which are easily avoided or resolved: |
| <p> |
| <ul class="spacious"> |
| |
| <li>For best results, ProGuard's optimization algorithms assume that the |
| processed code never <b>intentionally throws NullPointerExceptions</b> or |
| ArrayIndexOutOfBoundsExceptions, or even OutOfMemoryErrors or |
| StackOverflowErrors, in order to achieve something useful. For instance, |
| it may remove a method call <code>myObject.myMethod()</code> if that call |
| wouldn't have any effect. It ignores the possibility that |
| <code>myObject</code> might be null, causing a NullPointerException. In |
| some way this is a good thing: optimized code may throw fewer exceptions. |
| Should this entire assumption be false, you'll have to switch off |
| optimization using the <code>-dontoptimize</code> option.</li> |
| |
| <li>ProGuard's optimization algorithms currently also assume that the |
| processed code never creates <b>busy-waiting loops</b> without at least |
| testing on a volatile field. Again, it may remove such loops. Should this |
| assumption be false, you'll have to switch off optimization using |
| the <code>-dontoptimize</code> option.</li> |
| |
| <li>When obfuscating, ProGuard writes out class files named |
| "<code>a.class</code>", "<code>b.class</code>", etc. If a package contains |
| a large number of classes, ProGuard may also write out |
| <b>"<code>aux.class</code>"</b>. Inconveniently, Windows refuses to create |
| files with this reserved name (among a few other names). It's generally |
| better to write the output to a jar, in order to avoid such problems.</li> |
| |
| </ul> |
| |
| <hr /> |
| <address> |
| Copyright © 2002-2017 |
| <a target="other" href="http://www.lafortune.eu/">Eric Lafortune</a> @ <a target="top" href="http://www.guardsquare.com/">GuardSquare</a>. |
| </address> |
| </body> |
| </html> |
