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<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></A>
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<LI><A NAME="tex2html130"
HREF="node5.html#SECTION00032100000000000000">How to execute a program</A>
<LI><A NAME="tex2html131"
HREF="node5.html#SECTION00032200000000000000">Edit Mode</A>
<LI><A NAME="tex2html132"
HREF="node5.html#SECTION00032300000000000000">Implementation</A>
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<H2><A NAME="SECTION00032000000000000000"></A>
<A NAME="sec:apoointerface"></A>
<BR>
<TT>Apoo Interface</TT>
</H2>
<P>
This module is launched by the <TT>apoo</TT> command.
<P>
The <TT>Apoo Interface</TT> is an environment to monitoring the execution of a
Virtual Processor Unit.
<DIV ALIGN="CENTER"><A NAME="178"></A>
<TABLE>
<CAPTION ALIGN="BOTTOM"><STRONG>Figure:</STRONG>
Apoo Interface</CAPTION>
<TR><TD><A NAME="figure175"
HREF="img2.png"><IMG
WIDTH="200" HEIGHT="201"
SRC="Timg2.png"
ALT="\begin{figure}\centering
\epsfxsize =400pt
\epsfbox{apoo_interface.ps}
\par\par
\end{figure}"></A></TD></TR>
</TABLE>
</DIV>
<P>
During the execution of a program, it shows
the contents of the program counter, register, memory data and output
window. The
program in memory is displayed in an Assembly language (not in a
machine language). As is usual with processor units emulators, Apoo
has two memory segments: the program-segment and the data-segment. In
this way, both addresses for program instructions and data will begin
in 0.
<P>
It has two modes:
<P>
<DL>
<DT><STRONG>The Apoo Workbench</STRONG></DT>
<DD><A NAME="aw"></A> allows also the editing/saving of the text program,
providing an easy way to write/edit/debug/execute Apoo assembly
programs. It is launched when <TT>apoo</TT> is called without options
(optionally with a filename).
</DD>
<DT><STRONG>The Apoo Tester</STRONG></DT>
<DD><A NAME="at"></A> allows only to execute a program. It is
launched with option <TT>-t</TT> (or <TT>-tester</TT>), and a
filename is mandatory. This module is can be used during examinations.
</DD>
</DL>
<P>
<H3><A NAME="SECTION00032100000000000000">
How to execute a program</A>
</H3>
<P>
To execute a program in the Apoo Virtual Processor Unit you must first or:
<P>
<UL>
<LI>enter in Edit Mode and write its instructions
</LI>
<LI>open a text file with its code
</LI>
</UL>
<P>
After that, you can <TT>Load</TT> it; if a "parsing error" occurs,
enter edit mode and correct it; the interface will show the text line
in which the error occurred.
<P>
When the program is loaded (in memory) you can execute it in three ways:
<P>
<DL>
<DT><STRONG><TT>Run</TT></STRONG></DT>
<DD>will execute all the instructions
</DD>
<DT><STRONG><TT>Step</TT></STRONG></DT>
<DD>will execute the next instruction and the values of the
program counter, registers and memory data will be updated; the
next instruction line, if exists, will have the background
white
</DD>
<DT><STRONG><TT>Continue</TT></STRONG></DT>
<DD>will execute instructions until the next breakpoint
</DD>
</DL>
<P>
In an instruction line, you can set/clear a breakpoint:
<P>
<DL>
<DT><STRONG>to set a breakpoint:</STRONG></DT>
<DD>Press <TT><Double>-Button1</TT> in that
line
<P>
</DD>
<DT><STRONG>to clear breakpoint:</STRONG></DT>
<DD>Press <TT><Double>-Button1</TT> (or
<TT><Double>-Button2</TT>)
</DD>
</DL>
<P>
The button labelled <TT>Clear</TT> can be used to clear all breakpoints
<P>
<H3><A NAME="SECTION00032200000000000000">
Edit Mode</A>
</H3>
<P>
In edit mode you can change the text code of a program or create a new
one. To enter Edit Mode press the Edit button or New button.
After editing you can Save or SaveAs the current edited text.
You leave Edit Mode by loading the program (Load button) or opening a
new file.
<P>
The following <SPAN CLASS="textbf">Emacs</SPAN>-like commands are implemented:
<P>
<TABLE CELLPADDING=3>
<TR><TD ALIGN="LEFT"><TT><Control-k></TT></TD>
<TD ALIGN="LEFT">kill-line</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT><Control-y></TT></TD>
<TD ALIGN="LEFT">yank</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT><Control-w></TT></TD>
<TD ALIGN="LEFT">kill-region</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT><Escape>w</TT>(or <TT><Alt-Space></TT>)</TD>
<TD ALIGN="LEFT">copy-region-as-kill</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT><Control-at></TT>(or <TT><Control-Space></TT>)</TD>
<TD ALIGN="LEFT">set-mark-command</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT><Control-a></TT></TD>
<TD ALIGN="LEFT">beginning-of-line</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT><Control-e></TT></TD>
<TD ALIGN="LEFT">end-of-line</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT><Control-Home></TT></TD>
<TD ALIGN="LEFT">beginning-of-buffer</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT><Control-End></TT></TD>
<TD ALIGN="LEFT">end-of-buffer</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT><Control-d></TT></TD>
<TD ALIGN="LEFT">deletes the character to the right of the
insertion cursor.
<P></TD>
</TR>
</TABLE>
<P>
<H3><A NAME="SECTION00032300000000000000">
Implementation</A>
</H3>
<P>
Until version 1.4, apoo interface was based in <TT>TkInter</TT>. Newer
versions are based in <TT>pygtk</TT>.
<P>
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<ADDRESS>
<a href="http://www.ncc.up.pt/~rvr">Rogrio Reis</a>,<a href="http://www.ncc.up.pt/~nam">Nelma Moreira</a> <I>2006-10-31</I>
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