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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 07:40:18 EST 2001 --><TITLE>bcel API: Class OperandStack</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/OperandStack.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/verifier/structurals/LocalVariables.html"><B>PREV CLASS</B></A> <A HREF="../../../../../org/apache/bcel/verifier/structurals/Pass3bVerifier.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="OperandStack.html" TARGET="_top"><B>NO FRAMES</B></A></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: INNER | 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.verifier.structurals</FONT><BR>Class OperandStack</H2><PRE>java.lang.Object | +--<B>org.apache.bcel.verifier.structurals.OperandStack</B></PRE><HR><DL><DT>public class <B>OperandStack</B><DT>extends java.lang.Object</DL><P>This class implements a stack used for symbolic JVM stack simulation. [It's used an an operand stack substitute.] Elements of this stack are org.apache.bcel.generic.Type objects.<P><DL><DT><B>Version: </B><DD>$Id: OperandStack.java,v 1.1.1.1 2001/10/29 20:00:41 jvanzyl Exp $</DD><DT><B>Author: </B><DD><A HREF="http://www.inf.fu-berlin.de/~ehaase"/>Enver Haase</A></DD></DL><HR><P><!-- ======== INNER CLASS SUMMARY ======== --><!-- =========== 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/verifier/structurals/OperandStack.html#OperandStack(int)">OperandStack</A></B>(int maxStack)</CODE><BR> Creates an empty stack with a maximum of maxStack slots.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../../../../org/apache/bcel/verifier/structurals/OperandStack.html#OperandStack(int, org.apache.bcel.generic.ObjectType)">OperandStack</A></B>(int maxStack, <A HREF="../../../../../org/apache/bcel/generic/ObjectType.html">ObjectType</A> obj)</CODE><BR> Creates an otherwise empty stack with a maximum of maxStack slots and the ObjectType 'obj' at the top.</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> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../../org/apache/bcel/verifier/structurals/OperandStack.html#clear()">clear</A></B>()</CODE><BR> Clears the stack.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected java.lang.Object</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../../org/apache/bcel/verifier/structurals/OperandStack.html#clone()">clone</A></B>()</CODE><BR> Returns a deep copy of this object; that means, the clone operates on a new stack.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> boolean</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../../org/apache/bcel/verifier/structurals/OperandStack.html#equals(java.lang.Object)">equals</A></B>(java.lang.Object o)</CODE><BR> Returns true if and only if this OperandStack equals another, meaning equal lengths and equal objects on the stacks.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../../../org/apache/bcel/verifier/structurals/OperandStack.html">OperandStack</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../../../org/apache/bcel/verifier/structurals/OperandStack.html#getClone()">getClone</A></B>()</CODE><BR> Returns a (typed!) clone of this.</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/verifier/structurals/OperandStack.html#initializeObject(org.apache.bcel.verifier.structurals.UninitializedObjectType)">initializeObject</A></B>(<A HREF="../../../../../org/apache/bcel/verifier/structurals/UninitializedObjectType.html">UninitializedObjectType</A> u)</CODE><BR> Replaces all occurences of u in this OperandStack instance with an "initialized" ObjectType.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> boolean</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../../org/apache/bcel/verifier/structurals/OperandStack.html#isEmpty()">isEmpty</A></B>()</CODE><BR> Returns true IFF this OperandStack is empty.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> int</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../../org/apache/bcel/verifier/structurals/OperandStack.html#maxStack()">maxStack</A></B>()</CODE><BR> Returns the number of stack slots this stack can hold.</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/verifier/structurals/OperandStack.html#merge(org.apache.bcel.verifier.structurals.OperandStack)">merge</A></B>(<A HREF="../../../../../org/apache/bcel/verifier/structurals/OperandStack.html">OperandStack</A> s)</CODE><BR> Merges another stack state into this instance's stack state.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../../../org/apache/bcel/generic/Type.html">Type</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../../../org/apache/bcel/verifier/structurals/OperandStack.html#peek()">peek</A></B>()</CODE><BR> Returns the element on top of the stack.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../../../org/apache/bcel/generic/Type.html">Type</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../../../org/apache/bcel/verifier/structurals/OperandStack.html#peek(int)">peek</A></B>(int i)</CODE><BR> Returns the element that's i elements below the top element; that means, iff i==0 the top element is returned.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../../../org/apache/bcel/generic/Type.html">Type</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../../../org/apache/bcel/verifier/structurals/OperandStack.html#pop()">pop</A></B>()</CODE><BR> Returns the element on top of the stack.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../../../org/apache/bcel/generic/Type.html">Type</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../../../org/apache/bcel/verifier/structurals/OperandStack.html#pop(int)">pop</A></B>(int i)</CODE><BR> Pops i elements off the stack.</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/verifier/structurals/OperandStack.html#push(org.apache.bcel.generic.Type)">push</A></B>(<A HREF="../../../../../org/apache/bcel/generic/Type.html">Type</A> type)</CODE><BR> Pushes a Type object onto the stack.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> int</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../../org/apache/bcel/verifier/structurals/OperandStack.html#slotsUsed()">slotsUsed</A></B>()</CODE><BR> Returns the number of stack slots used.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> java.lang.String</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../../org/apache/bcel/verifier/structurals/OperandStack.html#toString()">toString</A></B>()</CODE><BR> Returns a String representation of this OperandStack instance.</TD></TR>⌨️ 快捷键说明
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