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<tr><td align="center" bgcolor="#8381de"><div class="skribetitle"><strong><big><big><big>5. Bdb<br/>The ``Bigloo Debugger''<br/>Nov 1999 -- Continuing execution after a breakpoint</big></big></big></strong></div><center>
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<tr><td valign="top" align="left"></td><td colspan="4" width="100%"><a href="bdb-1.html#Bdb-Copying-Conditions">Bdb Copying Conditions</a></td></tr>
<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="Continuing" class="mark"></a><a name="g1211" class="mark"></a>
When the execution has stopped at a breakpoint several commands allow the
execution to be resumed:<br/><br/>You may use any of the GDB commands to resume an execution
No distinction is made between Bigloo and C code. That is, it is
possible when stepping a Bigloo function to enter a C function and vice
versa. BDB does not try to hide the execution of C functions. Each code
compiled in debug mode is visible from BDB.<br/><br/><dl class="description" id='description1279'
> <dt><code id='code1215'
>continue [IGNORE-COUNT]</code></dt> <dt><code id='code1216'
>
</code></dt> <dt><code id='code1217'
>c [IGNORE-COUNT]</code></dt> <dt><code id='code1218'
>
</code></dt><dd><a name="g1219" class="mark"></a>Resume program execution at the address where your program last
stopped; any breakpoints set at that address are bypassed. The
optional argument IGNORE-COUNT allows you to specify a further
number of times to ignore a breakpoint at this location.<br/><br/></dd>
<dt><code id='code1223'
>step [COUNT]</code></dt> <dt><code id='code1224'
>
</code></dt> <dt><code id='code1225'
>s [COUNT]</code></dt> <dt><code id='code1226'
>
</code></dt><dd><a name="g1227" class="mark"></a>Continue running your program until control reaches a different
Scheme source line, then stop it and return control to BDB. This command
is abbreviated <code id='code1229'
>bs</code>.<br/><br/></dd>
<dt><code id='code1232'
>next [COUNT]</code></dt> <dt><code id='code1233'
>
</code></dt> <dt><code id='code1234'
>n [COUNT]</code></dt> <dt><code id='code1235'
>
</code></dt><dd><a name="g1236" class="mark"></a>Continue to the next source line in the current (innermost) stack
frame. This is similar to <code id='code1238'
>step</code>, but function calls that appear
within the line of code are executed without stopping. Execution
stops when control reaches a different line of code at the
original stack level that was executing when you gave the <code id='code1239'
>next</code>
command. This command is abbreviated <code id='code1240'
>n</code>.<br/><br/>An argument COUNT is a repeat count, as for <code id='code1242'
>step</code>.<br/><br/>The <code id='code1244'
>next</code> command now only stops at the first instruction of a
source line. This prevents the multiple stops that used to occur
in switch statements, for loops, etc.<br/><br/></dd>
<dt><code id='code1247'
>finish</code></dt> <dt><code id='code1248'
>
</code></dt> <dt><code id='code1249'
>f</code></dt> <dt><code id='code1250'
>
</code></dt><dd><a name="g1251" class="mark"></a>Continue running until just after the function in the selected stack
frame returns. Print the returned value (if any).<br/><br/></dd>
<dt><code id='code1255'
>until</code></dt> <dt><code id='code1256'
>
</code></dt> <dt><code id='code1257'
>u</code></dt> <dt><code id='code1258'
>
</code></dt><dd><a name="g1259" class="mark"></a>Continue running until a source line past the current line, in the
current stack frame, is reached. This command is used to avoid
single stepping through a loop more than once. It is like the
<code id='code1261'
>next</code> command, except that when <code id='code1262'
>until</code> encounters a jump, it
automatically continues execution until the program counter is
greater than the address of the jump.<br/><br/>This means that when you reach the end of a loop after single
stepping through it, <code id='code1264'
>until</code> makes your program continue execution
until it exits the loop. In contrast, a `next' command at the end
of a loop simply steps back to the beginning of the loop, which
forces you to step through the next iteration.<br/><br/><code id='code1266'
>until</code> always stops your program if it attempts to exit the
current stack frame.<br/><br/></dd>
<dt><code id='code1269'
>return [EXPRESSION]</code></dt> <dt><code id='code1270'
>
</code></dt> <dt><code id='code1271'
>r [EXPRESSION]</code></dt> <dt><code id='code1272'
>
</code></dt><dd><a name="g1273" class="mark"></a>
You may return from a function, using the <code id='code1275'
>return</code> GDB command
This cancels the execution of a function call.
If you give an <code id='code1277'
><em id='it1276'
>EXPRESSION</em></code> argument, its value is used as the function's
return value.
</dd>
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