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<div lang="en" class="refentry">
<a name="glib-genmarshal"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle">glib-genmarshal</span></h2>
<p>glib-genmarshal — C code marshaller generation utility for GLib closures</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<h2>Synopsis</h2>
<div class="cmdsynopsis"><p><code class="command">glib-genmarshal</code> [OPTION...] [FILE...]</p></div>
</div>
<div class="refsect1">
<a name="id-1.5.3.5"></a><h2>Description</h2>
<p><span class="command"><strong>glib-genmarshal</strong></span> is a small utility that generates C code
marshallers for callback functions of the GClosure mechanism in the GObject
sublibrary of GLib. The marshaller functions have a standard signature,
they get passed in the invoking closure, an array of value structures holding
the callback function parameters and a value structure for the return value
of the callback. The marshaller is then responsible to call the respective C
code function of the closure with all the parameters on the stack and to
collect its return value.
</p>
<p><span class="command"><strong>glib-genmarshal</strong></span> takes a list of marshallers to generate as
input. The marshaller list is either read from files passed as additional arguments
on the command line; or from standard input, by using <code class="literal">-</code> as the
input file.
</p>
<div class="refsect2">
<a name="id-1.5.3.5.4"></a><h3>Marshaller list format</h3>
<p>
The marshaller lists are processed line by line, a line can contain a
comment in the form of
</p>
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="preproc"># this</span><span class="normal"> is a comment</span></pre></td>
</tr>
</tbody>
</table>
</div>
<p>
or a marshaller specification of the form
</p>
<pre class="programlisting">
<em class="replaceable"><code>RTYPE</code></em>:<em class="replaceable"><code>PTYPE</code></em>
<em class="replaceable"><code>RTYPE</code></em>:<em class="replaceable"><code>PTYPE</code></em>,<em class="replaceable"><code>PTYPE</code></em>
<em class="replaceable"><code>RTYPE</code></em>:<em class="replaceable"><code>PTYPE</code></em>,<em class="replaceable"><code>PTYPE</code></em>,<em class="replaceable"><code>PTYPE</code></em>
</pre>
<p>
</p>
<p>
The <em class="replaceable"><code>RTYPE</code></em> part specifies the callback's return
type and the <em class="replaceable"><code>PTYPE</code></em>s right to the colon specify
the callback's parameter list, except for the first and the last arguments
which are always pointers.
</p>
</div>
<hr>
<div class="refsect2">
<a name="id-1.5.3.5.5"></a><h3>Parameter types</h3>
<p>
Currently, the following types are supported:
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="replaceable"><code>VOID</code></em></span></p></td>
<td><p>
indicates no return type, or no extra parameters.
If <em class="replaceable"><code>VOID</code></em> is used as the parameter list, no
additional parameters may be present.
</p></td>
</tr>
<tr>
<td><p><span class="term"><em class="replaceable"><code>BOOLEAN</code></em></span></p></td>
<td><p>
for boolean types (gboolean)
</p></td>
</tr>
<tr>
<td><p><span class="term"><em class="replaceable"><code>CHAR</code></em></span></p></td>
<td><p>
for signed char types (gchar)
</p></td>
</tr>
<tr>
<td><p><span class="term"><em class="replaceable"><code>UCHAR</code></em></span></p></td>
<td><p>
for unsigned char types (guchar)
</p></td>
</tr>
<tr>
<td><p><span class="term"><em class="replaceable"><code>INT</code></em></span></p></td>
<td><p>
for signed integer types (gint)
</p></td>
</tr>
<tr>
<td><p><span class="term"><em class="replaceable"><code>UINT</code></em></span></p></td>
<td><p>
for unsigned integer types (guint)
</p></td>
</tr>
<tr>
<td><p><span class="term"><em class="replaceable"><code>LONG</code></em></span></p></td>
<td><p>
for signed long integer types (glong)
</p></td>
</tr>
<tr>
<td><p><span class="term"><em class="replaceable"><code>ULONG</code></em></span></p></td>
<td><p>
for unsigned long integer types (gulong)
</p></td>
</tr>
<tr>
<td><p><span class="term"><em class="replaceable"><code>INT64</code></em></span></p></td>
<td><p>
for signed 64bit integer types (gint64)
</p></td>
</tr>
<tr>
<td><p><span class="term"><em class="replaceable"><code>UINT64</code></em></span></p></td>
<td><p>
for unsigned 64bit integer types (guint64)
</p></td>
</tr>
<tr>
<td><p><span class="term"><em class="replaceable"><code>ENUM</code></em></span></p></td>
<td><p>
for enumeration types (gint)
</p></td>
</tr>
<tr>
<td><p><span class="term"><em class="replaceable"><code>FLAGS</code></em></span></p></td>
<td><p>
for flag enumeration types (guint)
</p></td>
</tr>
<tr>
<td><p><span class="term"><em class="replaceable"><code>FLOAT</code></em></span></p></td>
<td><p>
for single-precision float types (gfloat)
</p></td>
</tr>
<tr>
<td><p><span class="term"><em class="replaceable"><code>DOUBLE</code></em></span></p></td>
<td><p>
for double-precision float types (gdouble)
</p></td>
</tr>
<tr>
<td><p><span class="term"><em class="replaceable"><code>STRING</code></em></span></p></td>
<td><p>
for string types (gchar*)
</p></td>
</tr>
<tr>
<td><p><span class="term"><em class="replaceable"><code>BOXED</code></em></span></p></td>
<td><p>
for boxed (anonymous but reference counted) types (GBoxed*)
</p></td>
</tr>
<tr>
<td><p><span class="term"><em class="replaceable"><code>PARAM</code></em></span></p></td>
<td><p>
for GParamSpec or derived types (GParamSpec*)
</p></td>
</tr>
<tr>
<td><p><span class="term"><em class="replaceable"><code>POINTER</code></em></span></p></td>
<td><p>
for anonymous pointer types (gpointer)
</p></td>
</tr>
<tr>
<td><p><span class="term"><em class="replaceable"><code>OBJECT</code></em></span></p></td>
<td><p>
for GObject or derived types (GObject*)
</p></td>
</tr>
<tr>
<td><p><span class="term"><em class="replaceable"><code>VARIANT</code></em></span></p></td>
<td><p>
for GVariant types (GVariant*)
</p></td>
</tr>
<tr>
<td><p><span class="term"><em class="replaceable"><code>NONE</code></em></span></p></td>
<td><p>
deprecated alias for <em class="replaceable"><code>VOID</code></em>
</p></td>
</tr>
<tr>
<td><p><span class="term"><em class="replaceable"><code>BOOL</code></em></span></p></td>
<td><p>
deprecated alias for <em class="replaceable"><code>BOOLEAN</code></em>
</p></td>
</tr>
</tbody>
</table></div>
<p>
</p>
</div>
</div>
<div class="refsect1">
<a name="id-1.5.3.6"></a><h2>Options</h2>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><code class="option">--header</code></span></p></td>
<td><p>
Generate header file contents of the marshallers. This option is mutually
exclusive with the <code class="option">--body</code> option.
</p></td>
</tr>
<tr>
<td><p><span class="term"><code class="option">--body</code></span></p></td>
<td><p>
Generate C code file contents of the marshallers. This option is mutually
exclusive with the <code class="option">--header</code> option.
</p></td>
</tr>
<tr>
<td><p><span class="term"><code class="option">--prefix=<em class="replaceable"><code>PREFIX</code></em></code></span></p></td>
<td><p>
Specify marshaller prefix. The default prefix is <code class="literal">`g_cclosure_user_marshal'</code>.
</p></td>
</tr>
<tr>
<td><p><span class="term"><code class="option">--skip-source</code></span></p></td>
<td><p>
Skip source location remarks in generated comments.
</p></td>
</tr>
<tr>
<td><p><span class="term"><code class="option">--stdinc</code></span></p></td>
<td><p>
Use the standard marshallers of the GObject library, and include
<code class="filename">glib-object.h</code> in generated header files. This
option is mutually exclusive with the <code class="option">--nostdinc</code>
option.
</p></td>
</tr>
<tr>
<td><p><span class="term"><code class="option">--nostdinc</code></span></p></td>
<td><p>
Do not use the standard marshallers of the GObject library, and skip
<code class="filename">glib-object.h</code> include directive in generated header files.
This option is mutually exclusive with the <code class="option">--stdinc</code> option.
</p></td>
</tr>
<tr>
<td><p><span class="term"><code class="option">--internal</code></span></p></td>
<td><p>
Mark generated functions as internal, using <code class="literal">G_GNUC_INTERNAL</code>.
</p></td>
</tr>
<tr>
<td><p><span class="term"><code class="option">--valist-marshallers</code></span></p></td>
<td><p>
Generate valist marshallers, for use with <code class="function">g_signal_set_va_marshaller()</code>.
</p></td>
</tr>
<tr>
<td><p><span class="term"><code class="option">-v</code>, <code class="option">--version</code></span></p></td>
<td><p>
Print version information.
</p></td>
</tr>
<tr>
<td><p><span class="term"><code class="option">--g-fatal-warnings</code></span></p></td>
<td><p>
Make warnings fatal, that is, exit immediately once a warning occurs.
</p></td>
</tr>
<tr>
<td><p><span class="term"><code class="option">-h</code>, <code class="option">--help</code></span></p></td>
<td><p>
Print brief help and exit.
</p></td>
</tr>
<tr>
<td><p><span class="term"><code class="option">-v</code>, <code class="option">--version</code></span></p></td>
<td><p>
Print version and exit.
</p></td>
</tr>
<tr>
<td><p><span class="term"><code class="option">--output=FILE</code></span></p></td>
<td><p>
Write output to <em class="replaceable"><code>FILE</code></em> instead of the standard output.
</p></td>
</tr>
<tr>
<td><p><span class="term"><code class="option">--prototypes</code></span></p></td>
<td><p>
Generate function prototypes before the function definition in the C source
file, in order to avoid a <code class="literal">missing-prototypes</code> compiler
warning. This option is only useful when using the <code class="option">--body</code>
option.
</p></td>
</tr>
<tr>
<td><p><span class="term"><code class="option">--pragma-once</code></span></p></td>
<td><p>
Use the <code class="literal">once</code> pragma instead of an old style header guard
when generating the C header file. This option is only useful when using the
<code class="option">--header</code> option.
</p></td>
</tr>
<tr>
<td><p><span class="term"><code class="option">--include-header=<em class="replaceable"><code>HEADER</code></em></code></span></p></td>
<td><p>
Adds a <code class="literal">#include</code> directive for the given file in the C
source file. This option is only useful when using the <code class="option">--body</code>
option.
</p></td>
</tr>
<tr>
<td><p><span class="term"><code class="option">-D <em class="replaceable"><code>SYMBOL[=VALUE]</code></em></code></span></p></td>
<td><p>
Adds a <code class="literal">#define</code> C pre-processor directive for
<em class="replaceable"><code>SYMBOL</code></em> and its given <em class="replaceable"><code>VALUE</code></em>,
or "1" if the value is unset. You can use this option multiple times; if you do,
all the symbols will be defined in the same order given on the command line, before
the symbols undefined using the <code class="option">-U</code> option. This option is only
useful when using the <code class="option">--body</code> option.
</p></td>
</tr>
<tr>
<td><p><span class="term"><code class="option">-U <em class="replaceable"><code>SYMBOL</code></em></code></span></p></td>
<td><p>
Adds a <code class="literal">#undef</code> C pre-processor directive to undefine the
given <em class="replaceable"><code>SYMBOL</code></em>. You can use this option multiple times;
if you do, all the symbols will be undefined in the same order given on the
command line, after the symbols defined using the <code class="option">-D</code> option.
This option is only useful when using the <code class="option">--body</code> option.
</p></td>
</tr>
<tr>
<td><p><span class="term"><code class="option">--quiet</code></span></p></td>
<td><p>
Minimizes the output of <span class="command"><strong>glib-genmarshal</strong></span>, by printing only
warnings and errors. This option is mutually exclusive with the
<code class="option">--verbose</code> option.
</p></td>
</tr>
<tr>
<td><p><span class="term"><code class="option">--verbose</code></span></p></td>
<td><p>
Increases the verbosity of <span class="command"><strong>glib-genmarshal</strong></span>, by printing
debugging information. This option is mutually exclusive with the
<code class="option">--quiet</code> option.
</p></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="id-1.5.3.7"></a><h2>Using glib-genmarshal with Autotools</h2>
<p>
In order to use <span class="command"><strong>glib-genmarshal</strong></span> in your project when using
Autotools as the build system, you will first need to modify your
<code class="filename">configure.ac</code> file to ensure you find the appropriate
command using <span class="command"><strong>pkg-config</strong></span>, similarly as to how you discover
the compiler and linker flags for GLib.
</p>
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
2
3</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="function">PKG_PROG_PKG_CONFIG</span><span class="symbol">([</span><span class="number">0.28</span><span class="symbol">])</span>
<span class="function">PKG_CHECK_VAR</span><span class="symbol">([</span><span class="normal">GLIB_GENMARSHAL</span><span class="symbol">],</span><span class="normal"> </span><span class="symbol">[</span><span class="normal">glib</span><span class="symbol">-</span><span class="number">2.0</span><span class="symbol">],</span><span class="normal"> </span><span class="symbol">[</span><span class="normal">glib_genmarshal</span><span class="symbol">])</span></pre></td>
</tr>
</tbody>
</table>
</div>
<p>
In your <code class="filename">Makefile.am</code> file you will typically need very
simple rules to generate the C files needed for the build.
</p>
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="normal">marshal</span><span class="symbol">.</span><span class="normal">h</span><span class="symbol">:</span><span class="normal"> marshal</span><span class="symbol">.</span><span class="normal">list</span>
<span class="normal"> $</span><span class="symbol">(</span><span class="normal">AM_V_GEN</span><span class="symbol">)</span><span class="normal">$</span><span class="symbol">(</span><span class="normal">GLIB_GENMARSHAL</span><span class="symbol">)</span><span class="normal"> </span><span class="symbol">\</span>
<span class="normal"> </span><span class="symbol">--</span><span class="normal">header </span><span class="symbol">\</span>
<span class="normal"> </span><span class="symbol">--</span><span class="normal">output</span><span class="symbol">=</span><span class="normal">$@ </span><span class="symbol">\</span>
<span class="normal"> $</span><span class="symbol"><</span>
<span class="normal">marshal</span><span class="symbol">.</span><span class="normal">c</span><span class="symbol">:</span><span class="normal"> marshal</span><span class="symbol">.</span><span class="usertype">list</span><span class="normal"> marshal</span><span class="symbol">.</span><span class="normal">h</span>
<span class="normal"> $</span><span class="symbol">(</span><span class="normal">AM_V_GEN</span><span class="symbol">)</span><span class="normal">$</span><span class="symbol">(</span><span class="normal">GLIB_GENMARSHAL</span><span class="symbol">)</span><span class="normal"> </span><span class="symbol">\</span>
<span class="normal"> </span><span class="symbol">--</span><span class="normal">include</span><span class="symbol">-</span><span class="normal">header</span><span class="symbol">=</span><span class="normal">marshal</span><span class="symbol">.</span><span class="normal">h </span><span class="symbol">\</span>
<span class="normal"> </span><span class="symbol">--</span><span class="normal">body </span><span class="symbol">\</span>
<span class="normal"> </span><span class="symbol">--</span><span class="normal">output</span><span class="symbol">=</span><span class="normal">$@ </span><span class="symbol">\</span>
<span class="normal"> $</span><span class="symbol"><</span>
<span class="normal">BUILT_SOURCES </span><span class="symbol">+=</span><span class="normal"> marshal</span><span class="symbol">.</span><span class="usertype">h</span><span class="normal"> marshal</span><span class="symbol">.</span><span class="normal">c</span>
<span class="normal">CLEANFILES </span><span class="symbol">+=</span><span class="normal"> marshal</span><span class="symbol">.</span><span class="usertype">h</span><span class="normal"> marshal</span><span class="symbol">.</span><span class="normal">c</span>
<span class="normal">EXTRA_DIST </span><span class="symbol">+=</span><span class="normal"> marshal</span><span class="symbol">.</span><span class="normal">list</span></pre></td>
</tr>
</tbody>
</table>
</div>
<p>
In the example above, the first rule generates the header file and depends on
a <code class="filename">marshal.list</code> file in order to regenerate the result in
case the marshallers list is updated. The second rule generates the source file
for the same <code class="filename">marshal.list</code>, and includes the file generated
by the header rule.
</p>
</div>
<div class="refsect1">
<a name="id-1.5.3.8"></a><h2>Example</h2>
<p>
To generate marshallers for the following callback functions:
</p>
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
2
3
4
5
6
7
8
9</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="type">void</span><span class="normal"> </span><span class="function">foo</span><span class="normal"> </span><span class="symbol">(</span><span class="usertype">gpointer</span><span class="normal"> data1</span><span class="symbol">,</span>
<span class="normal"> </span><span class="usertype">gpointer</span><span class="normal"> data2</span><span class="symbol">);</span>
<span class="type">void</span><span class="normal"> </span><span class="function">bar</span><span class="normal"> </span><span class="symbol">(</span><span class="usertype">gpointer</span><span class="normal"> data1</span><span class="symbol">,</span>
<span class="normal"> </span><span class="usertype">gint</span><span class="normal"> param1</span><span class="symbol">,</span>
<span class="normal"> </span><span class="usertype">gpointer</span><span class="normal"> data2</span><span class="symbol">);</span>
<span class="usertype">gfloat</span><span class="normal"> </span><span class="function">baz</span><span class="normal"> </span><span class="symbol">(</span><span class="usertype">gpointer</span><span class="normal"> data1</span><span class="symbol">,</span>
<span class="normal"> </span><span class="usertype">gboolean</span><span class="normal"> param1</span><span class="symbol">,</span>
<span class="normal"> </span><span class="usertype">guchar</span><span class="normal"> param2</span><span class="symbol">,</span>
<span class="normal"> </span><span class="usertype">gpointer</span><span class="normal"> data2</span><span class="symbol">);</span></pre></td>
</tr>
</tbody>
</table>
</div>
<p>
The <code class="filename">marshaller.list</code> file has to look like this:
</p>
<pre class="programlisting">
VOID:VOID
VOID:INT
FLOAT:BOOLEAN,UCHAR
</pre>
<p>
and you call glib-genmarshal like this:
</p>
<pre class="programlisting">
glib-genmarshal --header marshaller.list > marshaller.h
glib-genmarshal --body marshaller.list > marshaller.c
</pre>
<p>
The generated marshallers have the arguments encoded in their function name.
For this particular list, they are
</p>
<pre class="programlisting">
g_cclosure_user_marshal_VOID__VOID(...),
g_cclosure_user_marshal_VOID__INT(...),
g_cclosure_user_marshal_FLOAT__BOOLEAN_UCHAR(...).
</pre>
<p>
They can be used directly for GClosures or be passed in as the
GSignalCMarshaller c_marshaller; argument upon creation of signals:
</p>
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
2
3
4
5
6
7
8</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="usertype">GClosure</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">cc_foo</span><span class="symbol">,</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">cc_bar</span><span class="symbol">,</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">cc_baz</span><span class="symbol">;</span>
<span class="normal">cc_foo </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="gobject-Closures.html#g-cclosure-new">g_cclosure_new</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal"><a href="../glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">,</span><span class="normal"> foo</span><span class="symbol">,</span><span class="normal"> <a href="../glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">);</span>
<span class="function"><a href="gobject-Closures.html#g-closure-set-marshal">g_closure_set_marshal</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">cc_foo</span><span class="symbol">,</span><span class="normal"> g_cclosure_user_marshal_VOID__VOID</span><span class="symbol">);</span>
<span class="normal">cc_bar </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="gobject-Closures.html#g-cclosure-new">g_cclosure_new</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal"><a href="../glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">,</span><span class="normal"> bar</span><span class="symbol">,</span><span class="normal"> <a href="../glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">);</span>
<span class="function"><a href="gobject-Closures.html#g-closure-set-marshal">g_closure_set_marshal</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">cc_bar</span><span class="symbol">,</span><span class="normal"> g_cclosure_user_marshal_VOID__INT</span><span class="symbol">);</span>
<span class="normal">cc_baz </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="gobject-Closures.html#g-cclosure-new">g_cclosure_new</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal"><a href="../glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">,</span><span class="normal"> baz</span><span class="symbol">,</span><span class="normal"> <a href="../glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">);</span>
<span class="function"><a href="gobject-Closures.html#g-closure-set-marshal">g_closure_set_marshal</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">cc_baz</span><span class="symbol">,</span><span class="normal"> g_cclosure_user_marshal_FLOAT__BOOLEAN_UCHAR</span><span class="symbol">);</span></pre></td>
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<div class="refsect1">
<a name="id-1.5.3.9"></a><h2>See also</h2>
<p>
<span class="citerefentry"><span class="refentrytitle">glib-mkenums</span>(1)</span>
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