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OnEmpty.UnwindAndJump
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SUMMARY: <A HREF="#nested_classes_inherited_from_class_com.saxonica.bytecode.util.OnEmpty">NESTED</A> | <A HREF="#fields_inherited_from_class_com.saxonica.bytecode.util.OnEmpty">FIELD</A> | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD>
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com.saxonica.bytecode.util</FONT>
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Class OnEmpty.UnwindAndJump</H2>
<PRE>
<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</A>
<IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><A HREF="../../../../com/saxonica/bytecode/util/OnEmpty.html" title="class in com.saxonica.bytecode.util">com.saxonica.bytecode.util.OnEmpty</A>
<IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>com.saxonica.bytecode.util.OnEmpty.UnwindAndJump</B>
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<DT><B>Enclosing class:</B><DD><A HREF="../../../../com/saxonica/bytecode/util/OnEmpty.html" title="class in com.saxonica.bytecode.util">OnEmpty</A></DD>
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<DT><PRE>public static class <B>OnEmpty.UnwindAndJump</B><DT>extends <A HREF="../../../../com/saxonica/bytecode/util/OnEmpty.html" title="class in com.saxonica.bytecode.util">OnEmpty</A></DL>
</PRE>
<P>
The UnwindAndJump subclass causes the code generator, when an expression evaluates to the empty sequence,
to generate a "goto" instruction to a defined label; but before executing the jump, the stack will be unwound
to a known position.
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<TH ALIGN="left"><B>Nested classes/interfaces inherited from class com.saxonica.bytecode.util.<A HREF="../../../../com/saxonica/bytecode/util/OnEmpty.html" title="class in com.saxonica.bytecode.util">OnEmpty</A></B></TH>
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<TD><CODE><A HREF="../../../../com/saxonica/bytecode/util/OnEmpty.ReturnEmptyString.html" title="class in com.saxonica.bytecode.util">OnEmpty.ReturnEmptyString</A>, <A HREF="../../../../com/saxonica/bytecode/util/OnEmpty.ReturnNull.html" title="class in com.saxonica.bytecode.util">OnEmpty.ReturnNull</A>, <A HREF="../../../../com/saxonica/bytecode/util/OnEmpty.UnwindAndJump.html" title="class in com.saxonica.bytecode.util">OnEmpty.UnwindAndJump</A></CODE></TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../com/saxonica/bytecode/util/OnEmpty.html#RETURN_EMPTY_STRING">RETURN_EMPTY_STRING</A>, <A HREF="../../../../com/saxonica/bytecode/util/OnEmpty.html#RETURN_NULL">RETURN_NULL</A></CODE></TD>
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<TD><CODE><B><A HREF="../../../../com/saxonica/bytecode/util/OnEmpty.UnwindAndJump.html#OnEmpty.UnwindAndJump(com.saxonica.bytecode.util.LabelInfo)">OnEmpty.UnwindAndJump</A></B>(<A HREF="../../../../com/saxonica/bytecode/util/LabelInfo.html" title="class in com.saxonica.bytecode.util">LabelInfo</A> label)</CODE>
<BR>
Generate an UnwindAndStack action using an empty stack (no unwinding needed)</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../../com/saxonica/bytecode/util/OnEmpty.UnwindAndJump.html#OnEmpty.UnwindAndJump(java.util.Stack, com.saxonica.bytecode.util.LabelInfo)">OnEmpty.UnwindAndJump</A></B>(<A HREF="http://download.oracle.com/javase/6/docs/api/java/util/Stack.html?is-external=true" title="class or interface in java.util">Stack</A><<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A>> unwindStack,
<A HREF="../../../../com/saxonica/bytecode/util/LabelInfo.html" title="class in com.saxonica.bytecode.util">LabelInfo</A> label)</CODE>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/saxonica/bytecode/util/OnEmpty.UnwindAndJump.html#generate(com.saxonica.bytecode.util.Generator)">generate</A></B>(<A HREF="../../../../com/saxonica/bytecode/util/Generator.html" title="class in com.saxonica.bytecode.util">Generator</A> ga)</CODE>
<BR>
Generate code.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../com/saxonica/bytecode/util/LabelInfo.html" title="class in com.saxonica.bytecode.util">LabelInfo</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/saxonica/bytecode/util/OnEmpty.UnwindAndJump.html#getLabel()">getLabel</A></B>()</CODE>
<BR>
Get the label acting as the jump destination</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="http://download.oracle.com/javase/6/docs/api/java/util/Stack.html?is-external=true" title="class or interface in java.util">Stack</A><<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A>></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/saxonica/bytecode/util/OnEmpty.UnwindAndJump.html#getUnwindStack()">getUnwindStack</A></B>()</CODE>
<BR>
Get information about the stack that needs to be unwound before making the jump.</TD>
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<A NAME="OnEmpty.UnwindAndJump(java.util.Stack, com.saxonica.bytecode.util.LabelInfo)"><!-- --></A><H3>
OnEmpty.UnwindAndJump</H3>
<PRE>
public <B>OnEmpty.UnwindAndJump</B>(<A HREF="http://download.oracle.com/javase/6/docs/api/java/util/Stack.html?is-external=true" title="class or interface in java.util">Stack</A><<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A>> unwindStack,
<A HREF="../../../../com/saxonica/bytecode/util/LabelInfo.html" title="class in com.saxonica.bytecode.util">LabelInfo</A> label)</PRE>
<DL>
<DL>
<DT><B>Parameters:</B><DD><CODE>unwindStack</CODE> - Information about the classes of object that will be on the bytecode stack and must be
popped off the stack before jumping to the onEmpty label: the generated code must pop the items described
on this stack before jumping to the label.<DD><CODE>label</CODE> - a label to which control will be transferred (with nothing on the stack) if the result of the
evaluation is an empty sequence. This mechanism supports the design pattern whereby many expressions return
empty if one of there arguments is empty; rather than repeatedly checking for empty after evaluating each
subexpression, there is a "longjump" treating this as an exception case.</DL>
</DL>
<HR>
<A NAME="OnEmpty.UnwindAndJump(com.saxonica.bytecode.util.LabelInfo)"><!-- --></A><H3>
OnEmpty.UnwindAndJump</H3>
<PRE>
public <B>OnEmpty.UnwindAndJump</B>(<A HREF="../../../../com/saxonica/bytecode/util/LabelInfo.html" title="class in com.saxonica.bytecode.util">LabelInfo</A> label)</PRE>
<DL>
<DD>Generate an UnwindAndStack action using an empty stack (no unwinding needed)
<P>
<DL>
<DT><B>Parameters:</B><DD><CODE>label</CODE> - the label to jump to</DL>
</DL>
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<A NAME="generate(com.saxonica.bytecode.util.Generator)"><!-- --></A><H3>
generate</H3>
<PRE>
public void <B>generate</B>(<A HREF="../../../../com/saxonica/bytecode/util/Generator.html" title="class in com.saxonica.bytecode.util">Generator</A> ga)</PRE>
<DL>
<DD>Generate code. (This method is not extensively used)
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../com/saxonica/bytecode/util/OnEmpty.html#generate(com.saxonica.bytecode.util.Generator)">generate</A></CODE> in class <CODE><A HREF="../../../../com/saxonica/bytecode/util/OnEmpty.html" title="class in com.saxonica.bytecode.util">OnEmpty</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>ga</CODE> - the code generator</DL>
</DD>
</DL>
<HR>
<A NAME="getLabel()"><!-- --></A><H3>
getLabel</H3>
<PRE>
public <A HREF="../../../../com/saxonica/bytecode/util/LabelInfo.html" title="class in com.saxonica.bytecode.util">LabelInfo</A> <B>getLabel</B>()</PRE>
<DL>
<DD>Get the label acting as the jump destination
<P>
<DD><DL>
<DT><B>Returns:</B><DD>the label</DL>
</DD>
</DL>
<HR>
<A NAME="getUnwindStack()"><!-- --></A><H3>
getUnwindStack</H3>
<PRE>
public <A HREF="http://download.oracle.com/javase/6/docs/api/java/util/Stack.html?is-external=true" title="class or interface in java.util">Stack</A><<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A>> <B>getUnwindStack</B>()</PRE>
<DL>
<DD>Get information about the stack that needs to be unwound before making the jump. This contains
information about the class of object at each position, because doubles and longs occupy two words
and need a pop2 instruction to remove them
<P>
<DD><DL>
<DT><B>Returns:</B><DD>details of the stack to be unwound</DL>
</DD>
</DL>
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