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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Frameset//EN""http://www.w3.org/TR/REC-html40/frameset.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc on Sat Dec 15 07:40:16 EST 2001 --><TITLE>bcel API: Class InstructionFinder</TITLE><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../../stylesheet.css" TITLE="Style"></HEAD><BODY BGCOLOR="white"><!-- ========== START OF NAVBAR ========== --><A NAME="navbar_top"><!-- --></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0"><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3"> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="class-use/InstructionFinder.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../../org/apache/bcel/util/ClassVector.html"><B>PREV CLASS</B></A> <A HREF="../../../../org/apache/bcel/util/JavaWrapper.html"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../../index.html" TARGET="_top"><B>FRAMES</B></A> <A HREF="InstructionFinder.html" TARGET="_top"><B>NO FRAMES</B></A></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: <A HREF="#inner_class_summary">INNER</A> | FIELD | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: FIELD | <A HREF="#constructor_detail">CONSTR</A> | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><!-- =========== END OF NAVBAR =========== --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">org.apache.bcel.util</FONT><BR>Class InstructionFinder</H2><PRE>java.lang.Object | +--<B>org.apache.bcel.util.InstructionFinder</B></PRE><HR><DL><DT>public class <B>InstructionFinder</B><DT>extends java.lang.Object</DL><P>InstructionFinder is a tool to search for given instructions patterns, i.e., match sequences of instructions in an instruction list via regular expressions. This can be used, e.g., in order to implement a peep hole optimizer that looks for code patterns and replaces them with faster equivalents. <p>This class internally uses the <a href="http://jakarta.apache.org/regexp/"> Regexp</a> package to search for regular expressions. A typical application would look like this:<pre>InstructionFinder f = new InstructionFinder(il);String pat = "IfInstruction ICONST_0 GOTO ICONST_1 NOP (IFEQ|IFNE)";for(Iterator i = f.search(pat, constraint); i.hasNext(); ) {InstructionHandle[] match = (InstructionHandle[])i.next();...il.delete(match[1], match[5]);...}</pre><P><DL><DT><B>Version: </B><DD>$Id: InstructionFinder.java,v 1.1.1.1 2001/10/29 20:00:30 jvanzyl Exp $</DD><DT><B>Author: </B><DD><A HREF="http://www.berlin.de/~markus.dahm/">M. Dahm</A></DD><DT><B>See Also: </B><DD><A HREF="../../../../org/apache/bcel/generic/Instruction.html"><CODE>Instruction</CODE></A>, <A HREF="../../../../org/apache/bcel/generic/InstructionList.html"><CODE>InstructionList</CODE></A></DL><HR><P><!-- ======== INNER CLASS SUMMARY ======== --><A NAME="inner_class_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Inner Class Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static interface</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../org/apache/bcel/util/InstructionFinder.CodeConstraint.html">InstructionFinder.CodeConstraint</A></B></CODE><BR> Code patterns found may be checked using an additional user-defined constraint object whether they really match the needed criterion.</TD></TR></TABLE> <!-- =========== FIELD SUMMARY =========== --><!-- ======== CONSTRUCTOR SUMMARY ======== --><A NAME="constructor_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Constructor Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../../../org/apache/bcel/util/InstructionFinder.html#InstructionFinder(org.apache.bcel.generic.InstructionList)">InstructionFinder</A></B>(<A HREF="../../../../org/apache/bcel/generic/InstructionList.html">InstructionList</A> il)</CODE><BR> </TD></TR></TABLE> <!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Method Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../../org/apache/bcel/generic/InstructionList.html">InstructionList</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../../org/apache/bcel/util/InstructionFinder.html#getInstructionList()">getInstructionList</A></B>()</CODE><BR> </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../org/apache/bcel/util/InstructionFinder.html#reread()">reread</A></B>()</CODE><BR> Reread the instruction list, e.g., after you've altered the list upon a match.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> java.util.Iterator</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../org/apache/bcel/util/InstructionFinder.html#search(java.lang.String)">search</A></B>(java.lang.String pattern)</CODE><BR> Start search beginning from the start of the given instruction list.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> java.util.Iterator</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../org/apache/bcel/util/InstructionFinder.html#search(java.lang.String, org.apache.bcel.util.InstructionFinder.CodeConstraint)">search</A></B>(java.lang.String pattern, <A HREF="../../../../org/apache/bcel/util/InstructionFinder.CodeConstraint.html">InstructionFinder.CodeConstraint</A> constraint)</CODE><BR> Start search beginning from the start of the given instruction list.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> java.util.Iterator</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../org/apache/bcel/util/InstructionFinder.html#search(java.lang.String, org.apache.bcel.generic.InstructionHandle)">search</A></B>(java.lang.String pattern, <A HREF="../../../../org/apache/bcel/generic/InstructionHandle.html">InstructionHandle</A> from)</CODE><BR> Start search beginning from `from'.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> java.util.Iterator</CODE></FONT></TD>⌨️ 快捷键说明
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