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<head>
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<title>Parameters In Guile (Debugging with GDB)</title>
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<meta name="description" content="Parameters In Guile (Debugging with GDB)">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Guile-API.html#Guile-API" rel="up" title="Guile API">
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<link href="Progspaces-In-Guile.html#Progspaces-In-Guile" rel="next" title="Progspaces In Guile">
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<link href="Commands-In-Guile.html#Commands-In-Guile" rel="prev" title="Commands In Guile">
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<body lang="en">
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<a name="Parameters-In-Guile"></a>
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<div class="header">
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<p>
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Next: <a href="Progspaces-In-Guile.html#Progspaces-In-Guile" accesskey="n" rel="next">Progspaces In Guile</a>, Previous: <a href="Commands-In-Guile.html#Commands-In-Guile" accesskey="p" rel="prev">Commands In Guile</a>, Up: <a href="Guile-API.html#Guile-API" accesskey="u" rel="up">Guile API</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Parameters-In-Guile-1"></a>
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<h4 class="subsubsection">23.3.3.12 Parameters In Guile</h4>
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<a name="index-parameters-in-guile"></a>
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<a name="index-guile-parameters"></a>
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<a name="index-Parameter-1"></a>
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<p>You can implement new <small>GDB</small> <em>parameters</em> using Guile
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<a name="DOCF17" href="#FOOT17"><sup>17</sup></a>.
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</p>
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<p>There are many parameters that already exist and can be set in
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<small>GDB</small>. Two examples are: <code>set follow-fork</code> and
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<code>set charset</code>. Setting these parameters influences certain
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behavior in <small>GDB</small>. Similarly, you can define parameters that
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can be used to influence behavior in custom Guile scripts and commands.
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</p>
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<p>A new parameter is defined with the <code>make-parameter</code> Guile function,
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and added to <small>GDB</small> with the <code>register-parameter!</code> Guile function.
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This two-step approach is taken to separate out the side-effect of adding
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the parameter to <small>GDB</small> from <code>make-parameter</code>.
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</p>
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<p>Parameters are exposed to the user via the <code>set</code> and
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<code>show</code> commands. See <a href="Help.html#Help">Help</a>.
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</p>
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<dl>
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<dt><a name="index-_0028make_002dparameter"></a>Scheme Procedure: <strong>(make-parameter</strong> <em>name <span class="roman">[</span>#:command-class command-class<span class="roman">]</span> <span class="roman">[</span>#:parameter-type parameter-type] <span class="roman">[</span>#:enum-list enum-list<span class="roman">]</span> <span class="roman">[</span>#:set-func set-func] <span class="roman">[</span>#:show-func show-func] <span class="roman">[</span>#:doc doc] <span class="roman">[</span>#:set-doc set-doc] <span class="roman">[</span>#:show-doc show-doc] <span class="roman">[</span>#:initial-value initial-value])</em></dt>
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<dd>
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<p>The argument <var>name</var> is the name of the new parameter. If <var>name</var>
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consists of multiple words, then the initial words are looked for as prefix
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parameters. An example of this can be illustrated with the
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<code>set print</code> set of parameters. If <var>name</var> is
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<code>print foo</code>, then <code>print</code> will be searched as the prefix
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parameter. In this case the parameter can subsequently be accessed in
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<small>GDB</small> as <code>set print foo</code>.
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If <var>name</var> consists of multiple words, and no prefix parameter group
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can be found, an exception is raised.
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</p>
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<p>The result is the <code><gdb:parameter></code> object representing the parameter.
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The parameter is not usable until it has been registered with <small>GDB</small>
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with <code>register-parameter!</code>.
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</p>
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<p>The rest of the arguments are optional.
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</p>
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<p>The argument <var>command-class</var> should be one of the ‘<samp>COMMAND_</samp>’ constants
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(see <a href="Commands-In-Guile.html#Commands-In-Guile">Commands In Guile</a>). This argument tells <small>GDB</small> how to
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categorize the new parameter in the help system.
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The default is <code>COMMAND_NONE</code>.
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</p>
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<p>The argument <var>parameter-type</var> should be one of the ‘<samp>PARAM_</samp>’ constants
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defined below. This argument tells <small>GDB</small> the type of the new
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parameter; this information is used for input validation and
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completion. The default is <code>PARAM_BOOLEAN</code>.
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</p>
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<p>If <var>parameter-type</var> is <code>PARAM_ENUM</code>, then
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<var>enum-list</var> must be a list of strings. These strings
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represent the possible values for the parameter.
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</p>
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<p>If <var>parameter-type</var> is not <code>PARAM_ENUM</code>, then the presence
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of <var>enum-list</var> will cause an exception to be thrown.
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</p>
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<p>The argument <var>set-func</var> is a function of one argument: <var>self</var> which
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is the <code><gdb:parameter></code> object representing the parameter.
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<small>GDB</small> will call this function when a <var>parameter</var>’s value has
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been changed via the <code>set</code> API (for example, <kbd>set foo off</kbd>).
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The value of the parameter has already been set to the new value.
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This function must return a string to be displayed to the user.
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<small>GDB</small> will add a trailing newline if the string is non-empty.
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<small>GDB</small> generally doesn’t print anything when a parameter is set,
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thus typically this function should return ‘<samp>""</samp>’.
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A non-empty string result should typically be used for displaying warnings
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and errors.
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</p>
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<p>The argument <var>show-func</var> is a function of two arguments: <var>self</var> which
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is the <code><gdb:parameter></code> object representing the parameter, and
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<var>svalue</var> which is the string representation of the current value.
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<small>GDB</small> will call this function when a <var>parameter</var>’s
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<code>show</code> API has been invoked (for example, <kbd>show foo</kbd>).
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This function must return a string, and will be displayed to the user.
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<small>GDB</small> will add a trailing newline.
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</p>
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<p>The argument <var>doc</var> is the help text for the new parameter.
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If there is no documentation string, a default value is used.
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</p>
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<p>The argument <var>set-doc</var> is the help text for this parameter’s
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<code>set</code> command.
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</p>
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<p>The argument <var>show-doc</var> is the help text for this parameter’s
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<code>show</code> command.
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</p>
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<p>The argument <var>initial-value</var> specifies the initial value of the parameter.
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If it is a function, it takes one parameter, the <code><gdb:parameter></code>
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object and its result is used as the initial value of the parameter.
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The initial value must be valid for the parameter type,
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otherwise an exception is thrown.
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</p></dd></dl>
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<dl>
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<dt><a name="index-register_002dparameter_0021"></a>Scheme Procedure: <strong>register-parameter!</strong> <em>parameter</em></dt>
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<dd><p>Add <var>parameter</var>, a <code><gdb:parameter></code> object, to <small>GDB</small>’s
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list of parameters.
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It is an error to register a parameter more than once.
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The result is unspecified.
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</p></dd></dl>
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<dl>
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<dt><a name="index-parameter_003f"></a>Scheme Procedure: <strong>parameter?</strong> <em>object</em></dt>
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<dd><p>Return <code>#t</code> if <var>object</var> is a <code><gdb:parameter></code> object.
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Otherwise return <code>#f</code>.
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</p></dd></dl>
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<dl>
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<dt><a name="index-parameter_002dvalue"></a>Scheme Procedure: <strong>parameter-value</strong> <em>parameter</em></dt>
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<dd><p>Return the value of <var>parameter</var> which may either be
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a <code><gdb:parameter></code> object or a string naming the parameter.
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</p></dd></dl>
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<dl>
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<dt><a name="index-set_002dparameter_002dvalue_0021"></a>Scheme Procedure: <strong>set-parameter-value!</strong> <em>parameter new-value</em></dt>
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<dd><p>Assign <var>parameter</var> the value of <var>new-value</var>.
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The argument <var>parameter</var> must be an object of type <code><gdb:parameter></code>.
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<small>GDB</small> does validation when assignments are made.
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</p></dd></dl>
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<p>When a new parameter is defined, its type must be specified. The
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available types are represented by constants defined in the <code>gdb</code>
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module:
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</p>
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<dl compact="compact">
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<dt><code>PARAM_BOOLEAN</code>
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<a name="index-PARAM_005fBOOLEAN-1"></a>
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</dt>
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<dd><p>The value is a plain boolean. The Guile boolean values, <code>#t</code>
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and <code>#f</code> are the only valid values.
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</p>
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</dd>
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<dt><code>PARAM_AUTO_BOOLEAN</code>
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<a name="index-PARAM_005fAUTO_005fBOOLEAN-1"></a>
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</dt>
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<dd><p>The value has three possible states: true, false, and ‘<samp>auto</samp>’. In
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Guile, true and false are represented using boolean constants, and
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‘<samp>auto</samp>’ is represented using <code>#:auto</code>.
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</p>
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</dd>
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<dt><code>PARAM_UINTEGER</code>
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<a name="index-PARAM_005fUINTEGER-1"></a>
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</dt>
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<dd><p>The value is an unsigned integer. The value of 0 should be
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interpreted to mean “unlimited”.
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</p>
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</dd>
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<dt><code>PARAM_ZINTEGER</code>
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<a name="index-PARAM_005fZINTEGER-1"></a>
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</dt>
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<dd><p>The value is an integer.
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</p>
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</dd>
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<dt><code>PARAM_ZUINTEGER</code>
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<a name="index-PARAM_005fZUINTEGER-1"></a>
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</dt>
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<dd><p>The value is an unsigned integer.
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</p>
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</dd>
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<dt><code>PARAM_ZUINTEGER_UNLIMITED</code>
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<a name="index-PARAM_005fZUINTEGER_005fUNLIMITED-1"></a>
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</dt>
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<dd><p>The value is an integer in the range ‘<samp>[0, INT_MAX]</samp>’.
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A value of ‘<samp>-1</samp>’ means “unlimited”, and other negative
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numbers are not allowed.
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</p>
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</dd>
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<dt><code>PARAM_STRING</code>
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<a name="index-PARAM_005fSTRING-1"></a>
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</dt>
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<dd><p>The value is a string. When the user modifies the string, any escape
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sequences, such as ‘<samp>\t</samp>’, ‘<samp>\f</samp>’, and octal escapes, are
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translated into corresponding characters and encoded into the current
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host charset.
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</p>
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</dd>
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<dt><code>PARAM_STRING_NOESCAPE</code>
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<a name="index-PARAM_005fSTRING_005fNOESCAPE-1"></a>
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</dt>
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<dd><p>The value is a string. When the user modifies the string, escapes are
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passed through untranslated.
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</p>
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</dd>
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<dt><code>PARAM_OPTIONAL_FILENAME</code>
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<a name="index-PARAM_005fOPTIONAL_005fFILENAME-1"></a>
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</dt>
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<dd><p>The value is a either a filename (a string), or <code>#f</code>.
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</p>
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</dd>
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<dt><code>PARAM_FILENAME</code>
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<a name="index-PARAM_005fFILENAME-1"></a>
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</dt>
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<dd><p>The value is a filename. This is just like
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<code>PARAM_STRING_NOESCAPE</code>, but uses file names for completion.
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</p>
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</dd>
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|
<dt><code>PARAM_ENUM</code>
|
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<a name="index-PARAM_005fENUM-1"></a>
|
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</dt>
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<dd><p>The value is a string, which must be one of a collection of string
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constants provided when the parameter is created.
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</p></dd>
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</dl>
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<div class="footnote">
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<hr>
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<h4 class="footnotes-heading">Footnotes</h4>
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<h3><a name="FOOT17" href="#DOCF17">(17)</a></h3>
|
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<p>Note that <small>GDB</small> parameters must not be confused with
|
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|
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Guileâs parameter objects (see <a href="http://www.gnu.org/software/guile/manual/html_node/Parameters.html#Parameters">Parameters</a> in <cite>GNU Guile
|
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Reference Manual</cite>).</p>
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</div>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Progspaces-In-Guile.html#Progspaces-In-Guile" accesskey="n" rel="next">Progspaces In Guile</a>, Previous: <a href="Commands-In-Guile.html#Commands-In-Guile" accesskey="p" rel="prev">Commands In Guile</a>, Up: <a href="Guile-API.html#Guile-API" accesskey="u" rel="up">Guile API</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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</body>
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</html>
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