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<tr><td align="center" bgcolor="#8381de"><div class="skribetitle"><strong><big><big><big>3. Bdb<br/>The ``Bigloo Debugger''<br/>Nov 1999 -- Running Programs Under BDB</big></big></big></strong></div><center>
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>Running Programs Under BDB</strong></font></th></tr>
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<tr><td valign="top" align="left">3.1</td><td colspan="4" width="100%"><a href="bdb-4.html#Solaris-Run">Solaris Run</a></td></tr>
<tr><td valign="top" align="left">3.2</td><td colspan="4" width="100%"><a href="bdb-4.html#Scheme-vs-C">Scheme vs C</a></td></tr>
<tr><td valign="top" align="left">3.3</td><td colspan="4" width="100%"><a href="bdb-4.html#Compilation">Compilation</a></td></tr>
<tr><td valign="top" align="left">3.4</td><td colspan="4" width="100%"><a href="bdb-4.html#Starting">Starting</a></td></tr>
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<tr><td valign="top" align="left">1</td><td colspan="4" width="100%"><a href="bdb-2.html#Table-of-contents">Table of contents</a></td></tr>
<tr><td valign="top" align="left">2</td><td colspan="4" width="100%"><a href="bdb-3.html#Overview">Overview</a></td></tr>
<tr><td valign="top" align="left">3</td><td colspan="4" width="100%"><a href="bdb-4.html#Running-Programs-Under-BDB">Running Programs Under BDB</a></td></tr>
<tr><td valign="top" align="left">4</td><td colspan="4" width="100%"><a href="bdb-5.html#Stopping">Stopping</a></td></tr>
<tr><td valign="top" align="left">5</td><td colspan="4" width="100%"><a href="bdb-6.html#Continuing-execution-after-a-breakpoint">Continuing execution after a breakpoint</a></td></tr>
<tr><td valign="top" align="left">6</td><td colspan="4" width="100%"><a href="bdb-7.html#Examining-the-Stack">Examining the Stack</a></td></tr>
<tr><td valign="top" align="left">7</td><td colspan="4" width="100%"><a href="bdb-8.html#Using-BDB-under-Emacs">Using BDB under Emacs</a></td></tr>
<tr><td valign="top" align="left"></td><td colspan="4" width="100%"><a href="bdb-9.html#Bibliography">Bibliography</a></td></tr>
<tr><td valign="top" align="left"></td><td colspan="4" width="100%"><a href="bdb-10.html#Index">Index</a></td></tr>
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<a name="Running" class="mark"></a><a name="g1122" class="mark"></a>
Other informations may be found at See info-file ` gdb.info', Gdb.<br/><br/><!-- Solaris Run -->
<a name="Solaris-Run"></a>
<div class="section-atitle"><table width="100%"><tr><td bgcolor="#dedeff"><h3><font color="black">3.1 Solaris Run</font>
</h3></td></tr></table>
</div><div class="section">
<a name="Solaris-Run" class="mark"></a>
On the Solaris platform, the normal initialization process of the Garbage
Collector is to raise a <code id='code1125'
>SIGSEGV</code> signal. You can safely ignore
this signal. Simply emit a |continue| when the execution first stops
because of that signal.<br/><br/></div><br>
<!-- Scheme vs C -->
<a name="Scheme-vs-C"></a>
<div class="section-atitle"><table width="100%"><tr><td bgcolor="#dedeff"><h3><font color="black">3.2 Scheme vs C</font>
</h3></td></tr></table>
</div><div class="section">
<a name="Scheme-vs-C" class="mark"></a>
BDB is able to debug both Scheme and C code. Commands to inspect
variables and code are the same for Scheme and C. The general convention
adopted by BDB is to represent Scheme symbols in uppercase. This distinction
is of importance because the BDB treatment is different for a Scheme expression
and for a C expression. For instance, the command<br/><br/><center id='center1130'
><table cellspacing="0" class="color" cellpadding="0" width="95%"><tbody>
<tr><td bgcolor="#ffffcc"><pre class="prog" id='prog1128'
>break main
</pre>
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sets a breakpoint into a C function named <code id='code1131'
>main</code>. While the command<br/><br/><center id='center1135'
><table cellspacing="0" class="color" cellpadding="0" width="95%"><tbody>
<tr><td bgcolor="#ffffcc"><pre class="prog" id='prog1133'
>break MAIN
</pre>
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sets a breakpoint into a Scheme function named <code id='code1136'
>main</code>.<br/><br/></div><br>
<!-- Compilation -->
<a name="Compilation"></a>
<div class="section-atitle"><table width="100%"><tr><td bgcolor="#dedeff"><h3><font color="black">3.3 Compilation</font>
</h3></td></tr></table>
</div><div class="section">
<a name="Compilation" class="mark"></a>
BDB requires special compilation mode for Bigloo and C files. Some of
the files may not be compiled in that special mode. For those, BDB
won't be able to step over the code. It is mandatory that, <em id='emph1138'
>at
least</em>, the Bigloo module that contains the main entry point is compiled
with debugging informations
The two options that tells Bigloo to produce BDB code are <code id='code1139'
>-gbdb</code> and
<code id='code1140'
>-gbdb2</code>. The second delivers more runtime informations but may
enlarge the size of the binary file. The option to use when compiling
C code is the regular debugging option (e.g. <code id='code1141'
>-g</code>)
There is no need to link programs with static version of the libraries
although setting up breakpoints in library code is enabled only for
static libraries. On some platforms linking with static versions of the
libraries will prevent the debugger from getting confused when loading
a dynamic library (e.g. it may happen that the debugger <em id='emph1142'
>steps</em>
the dynamic code loader).<br/><br/></div><br>
<!-- Starting -->
<a name="Starting"></a>
<div class="section-atitle"><table width="100%"><tr><td bgcolor="#dedeff"><h3><font color="black">3.4 Starting</font>
</h3></td></tr></table>
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<a name="Starting" class="mark"></a>
<dl class="description" id='description1153'
> <dt><code id='code1144'
>run</code></dt> <dt><code id='code1145'
>
</code></dt> <dt><code id='code1146'
>r</code></dt> <dt><code id='code1147'
>
</code></dt><dd><a name="g1148" class="mark"></a>
Use the <code id='code1150'
>run</code> command to start your program under BDB. You must
first specify the program name with an argument to BDB, or by using the
<code id='code1151'
>file</code> command
</dd>
</dl>
<dl class="description" id='description1163'
> <dt><em id='emph1154'
>The arguments.</em></dt> <dt><em id='emph1155'
>
</em></dt><dd>Specify the arguments passed to your program as the arguments of the
<code id='code1156'
>run</code> command. If no arguments are specified and this run invocation
is not the first one, previous arguments to the last <code id='code1157'
>run</code> command
are used
</dd>
<dt><em id='emph1159'
>The standard input and output.</em></dt> <dt><em id='emph1160'
>
</em></dt><dd>The current BDB version is unable to debug interactive programs. This is a
major flaw remedied by the graphical version of BDB (namely KBDB).<br/><br/></dd>
</dl>
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