| <!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>Optimizations</title> |
| <script type="text/javascript" language="JavaScript"> |
| <!-- |
| if (window.self==window.top) |
| window.top.location.replace("../index.html#"+window.location.pathname+window.location.hash); |
| else { |
| var hash="#"+window.location.pathname.replace(window.top.location.pathname.replace("index.html", ""), ""); |
| if (window.top.location.hash!=hash) |
| window.top.location.hash=hash; |
| } |
| //--> |
| </script> |
| </head> |
| <body> |
| |
| <h2>Optimizations</h2> |
| |
| The optimization step of ProGuard can be switched off with the |
| <a href="usage.html#dontoptimize"><code>-dontoptimize</code></a> option. For |
| more fine-grained control over individual optimizations, experts can use the |
| <a href="usage.html#optimizations"><code>-optimizations</code></a> option, |
| with a filter based on the optimization names listed below. The filter works |
| like any <a href="usage.html#filters">filter</a> in ProGuard. |
| <p> |
| |
| The following wildcards are supported: |
| |
| <table cellspacing="10"> |
| <tr><td valign="top"><code><b>?</b></code></td> |
| <td>matches any single character in an optimization name.</td></tr> |
| <tr><td valign="top"><code><b>*</b></code></td> |
| <td>matches any part of an optimization name.</td></tr> |
| </table> |
| |
| An optimization that is preceded by an exclamation mark '<b>!</b>' is |
| <i>excluded</i> from further attempts to match with <i>subsequent</i> |
| optimization names in the filter. Make sure to specify filters correctly, |
| since they are not checked for potential typos. |
| <p> |
| |
| For example, |
| "<code>code/simplification/variable,code/simplification/arithmetic</code>" |
| only performs the two specified peephole optimizations. |
| <p> |
| |
| For example, "<code>!method/propagation/*</code>" performs all optimizations, |
| except the ones that propagate values between methods. |
| <p> |
| |
| For example, |
| "<code>!code/simplification/advanced,code/simplification/*</code>" only |
| performs all peephole optimizations. |
| <p> |
| Some optimizations necessarily imply other optimizations. These are then |
| indicated. Note that the list is likely to change over time, as optimizations |
| are added and reorganized. |
| <p> |
| |
| <dl> |
| <dt><code><b>class/marking/final</b></code></dt> |
| <dd>Marks classes as final, whenever possible.</dd> |
| |
| <dt><code><b>class/merging/vertical</b></code></dt> |
| <dd>Merges classes vertically in the class hierarchy, whenever possible.</dd> |
| |
| <dt><code><b>class/merging/horizontal</b></code></dt> |
| <dd>Merges classes horizontally in the class hierarchy, whenever possible.</dd> |
| |
| <dt><div>(⇒ <code>code/removal/advanced</code>)</div> |
| <code><b>field/removal/writeonly</b></code></dt> |
| <dd>Removes write-only fields.</dd> |
| |
| <dt><code><b>field/marking/private</b></code></dt> |
| <dd>Marks fields as private, whenever possible.</dd> |
| |
| <dt><div>(⇒ <code>code/simplification/advanced</code>)</div> |
| <code><b>field/propagation/value</b></code></dt> |
| <dd>Propagates the values of fields across methods.</dd> |
| |
| <dt><code><b>method/marking/private</b></code></dt> |
| <dd>Marks methods as private, whenever possible (<i>devirtualization</i>).</dd> |
| |
| <dt><div>(⇒ <code>code/removal/advanced</code>)</div> |
| <code><b>method/marking/static</b></code></dt> |
| <dd>Marks methods as static, whenever possible (<i>devirtualization</i>).</dd> |
| |
| <dt><code><b>method/marking/final</b></code></dt> |
| <dd>Marks methods as final, whenever possible.</dd> |
| |
| <dt><div>(⇒ <code>code/removal/advanced</code>)</div> |
| <code><b>method/removal/parameter</b></code></dt> |
| <dd>Removes unused method parameters.</dd> |
| |
| <dt><div>(⇒ <code>code/simplification/advanced</code>)</div> |
| <code><b>method/propagation/parameter</b></code></dt> |
| <dd>Propagates the values of method parameters from method invocations to |
| the invoked methods.</dd> |
| |
| <dt><div>(⇒ <code>code/simplification/advanced</code>)</div> |
| <code><b>method/propagation/returnvalue</b></code></dt> |
| <dd>Propagates the values of method return values from methods to their |
| invocations.</dd> |
| |
| <dt><code><b>method/inlining/short</b></code></dt> |
| <dd>Inlines short methods.</dd> |
| |
| <dt><code><b>method/inlining/unique</b></code></dt> |
| <dd>Inlines methods that are only called once.</dd> |
| |
| <dt><code><b>method/inlining/tailrecursion</b></code></dt> |
| <dd>Simplifies tail recursion calls, whenever possible.</dd> |
| |
| <dt><code><b>code/merging</b></code></dt> |
| <dd>Merges identical blocks of code by modifying branch targets.</dd> |
| |
| <dt><code><b>code/simplification/variable</b></code></dt> |
| <dd>Performs peephole optimizations for variable loading and storing.</dd> |
| |
| <dt><code><b>code/simplification/arithmetic</b></code></dt> |
| <dd>Performs peephole optimizations for arithmetic instructions.</dd> |
| |
| <dt><code><b>code/simplification/cast</b></code></dt> |
| <dd>Performs peephole optimizations for casting operations.</dd> |
| |
| <dt><code><b>code/simplification/field</b></code></dt> |
| <dd>Performs peephole optimizations for field loading and storing.</dd> |
| |
| <dt><div>(⇒ <code>code/removal/simple</code>)</div> |
| <code><b>code/simplification/branch</b></code></dt> |
| <dd>Performs peephole optimizations for branch instructions.</dd> |
| |
| <dt><code><b>code/simplification/string</b></code></dt> |
| <dd>Performs peephole optimizations for constant strings.</dd> |
| |
| <dt><div>(<i>best used with</i> <code>code/removal/advanced</code>)</div> |
| <code><b>code/simplification/advanced</b></code></dt> |
| <dd>Simplifies code based on control flow analysis and data flow |
| analysis.</dd> |
| |
| <dt><div>(⇒ <code>code/removal/exception</code>)</div> |
| <code><b>code/removal/advanced</b></code></dt> |
| <dd>Removes dead code based on control flow analysis and data flow |
| analysis.</dd> |
| |
| <dt><div>(⇒ <code>code/removal/exception</code>)</div> |
| <code><b>code/removal/simple</b></code></dt> |
| <dd>Removes dead code based on a simple control flow analysis.</dd> |
| |
| <dt><code><b>code/removal/variable</b></code></dt> |
| <dd>Removes unused variables from the local variable frame.</dd> |
| |
| <dt><code><b>code/removal/exception</b></code></dt> |
| <dd>Removes exceptions with empty try blocks.</dd> |
| |
| <dt><code><b>code/allocation/variable</b></code></dt> |
| <dd>Optimizes variable allocation on the local variable frame.</dd> |
| </dl> |
| |
| <hr /> |
| <noscript><div><a target="_top" href="../index.html" class="button">Show menu</a></div></noscript> |
| <address> |
| Copyright © 2002-2011 |
| <a target="other" href="http://www.lafortune.eu/">Eric Lafortune</a>. |
| </address> |
| </body> |
| </html> |
