NAME

       glib-genmarshal - C code marshaller generation utility for GLib closures

SYNOPSIS

       glib-genmarshal [OPTION...] [FILE...]

DESCRIPTION

       glib-genmarshal 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.

       glib-genmarshal 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 - as the input
       file.

   Marshaller list format
       The marshaller lists are processed line by line, a line can contain a comment in the form of
       or a marshaller specification of the form

           RTYPE:PTYPE
           RTYPE:PTYPE,PTYPE
           RTYPE:PTYPE,PTYPE,PTYPE

       The RTYPE part specifies the callback's return type and the PTYPEs right to the colon specify the
       callback's parameter list, except for the first and the last arguments which are always pointers.

   Parameter types
       Currently, the following types are supported:

       VOID
           indicates no return type, or no extra parameters. If VOID is used as the parameter list, no
           additional parameters may be present.

       BOOLEAN
           for boolean types (gboolean)

       CHAR
           for signed char types (gchar)

       UCHAR
           for unsigned char types (guchar)

       INT
           for signed integer types (gint)

       UINT
           for unsigned integer types (guint)

       LONG
           for signed long integer types (glong)

       ULONG
           for unsigned long integer types (gulong)

       INT64
           for signed 64bit integer types (gint64)

       UINT64
           for unsigned 64bit integer types (guint64)

       ENUM
           for enumeration types (gint)

       FLAGS
           for flag enumeration types (guint)

       FLOAT
           for single-precision float types (gfloat)

       DOUBLE
           for double-precision float types (gdouble)

       STRING
           for string types (gchar*)

       BOXED
           for boxed (anonymous but reference counted) types (GBoxed*)

       PARAM
           for GParamSpec or derived types (GParamSpec*)

       POINTER
           for anonymous pointer types (gpointer)

       OBJECT
           for GObject or derived types (GObject*)

       VARIANT
           for GVariant types (GVariant*)

       NONE
           deprecated alias for VOID

       BOOL
           deprecated alias for BOOLEAN

OPTIONS

       --header
           Generate header file contents of the marshallers. This option is mutually exclusive with the --body
           option.

       --body
           Generate C code file contents of the marshallers. This option is mutually exclusive with the --header
           option.

       --prefix=PREFIX
           Specify marshaller prefix. The default prefix is `g_cclosure_user_marshal'.

       --skip-source
           Skip source location remarks in generated comments.

       --stdinc
           Use the standard marshallers of the GObject library, and include glib-object.h in generated header
           files. This option is mutually exclusive with the --nostdinc option.

       --nostdinc
           Do not use the standard marshallers of the GObject library, and skip glib-object.h include directive
           in generated header files. This option is mutually exclusive with the --stdinc option.

       --internal
           Mark generated functions as internal, using G_GNUC_INTERNAL.

       --valist-marshallers
           Generate valist marshallers, for use with g_signal_set_va_marshaller().

       -v, --version
           Print version information.

       --g-fatal-warnings
           Make warnings fatal, that is, exit immediately once a warning occurs.

       -h, --help
           Print brief help and exit.

       -v, --version
           Print version and exit.

       --output=FILE
           Write output to FILE instead of the standard output.

       --prototypes
           Generate function prototypes before the function definition in the C source file, in order to avoid a
           missing-prototypes compiler warning. This option is only useful when using the --body option.

       --pragma-once
           Use the once pragma instead of an old style header guard when generating the C header file. This
           option is only useful when using the --header option.

       --include-header=HEADER
           Adds a #include directive for the given file in the C source file. This option is only useful when
           using the --body option.

       -D SYMBOL[=VALUE]
           Adds a #define C pre-processor directive for SYMBOL and its given VALUE, 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 -U option. This option is
           only useful when using the --body option.

       -U SYMBOL
           Adds a #undef C pre-processor directive to undefine the given SYMBOL. 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 -D option. This option is only useful when using the --body
           option.

       --quiet
           Minimizes the output of glib-genmarshal, by printing only warnings and errors. This option is
           mutually exclusive with the --verbose option.

       --verbose
           Increases the verbosity of glib-genmarshal, by printing debugging information. This option is
           mutually exclusive with the --quiet option.

USING GLIB-GENMARSHAL WITH AUTOTOOLS

       In order to use glib-genmarshal in your project when using Autotools as the build system, you will first
       need to modify your configure.ac file to ensure you find the appropriate command using pkg-config,
       similarly as to how you discover the compiler and linker flags for GLib.

           PKG_PROG_PKG_CONFIG([0.28])

           PKG_CHECK_VAR([GLIB_GENMARSHAL], [glib-2.0], [glib_genmarshal])

       In your Makefile.am file you will typically need very simple rules to generate the C files needed for the
       build.

           marshal.h: marshal.list
                   $(AM_V_GEN)$(GLIB_GENMARSHAL) \
                           --header \
                           --output=$@ \
                           $<

           marshal.c: marshal.list marshal.h
                   $(AM_V_GEN)$(GLIB_GENMARSHAL) \
                           --include-header=marshal.h \
                           --body \
                           --output=$@ \
                           $<

           BUILT_SOURCES += marshal.h marshal.c
           CLEANFILES += marshal.h marshal.c
           EXTRA_DIST += marshal.list

       In the example above, the first rule generates the header file and depends on a marshal.list file in
       order to regenerate the result in case the marshallers list is updated. The second rule generates the
       source file for the same marshal.list, and includes the file generated by the header rule.

EXAMPLE

       To generate marshallers for the following callback functions:

           void   foo (gpointer data1,
                       gpointer data2);
           void   bar (gpointer data1,
                       gint     param1,
                       gpointer data2);
           gfloat baz (gpointer data1,
                       gboolean param1,
                       guchar   param2,
                       gpointer data2);

       The marshaller.list file has to look like this:

           VOID:VOID
           VOID:INT
           FLOAT:BOOLEAN,UCHAR

       and you call glib-genmarshal like this:

           glib-genmarshal --header marshaller.list > marshaller.h
           glib-genmarshal --body marshaller.list > marshaller.c

       The generated marshallers have the arguments encoded in their function name. For this particular list,
       they are

           g_cclosure_user_marshal_VOID__VOID(...),
           g_cclosure_user_marshal_VOID__INT(...),
           g_cclosure_user_marshal_FLOAT__BOOLEAN_UCHAR(...).

       They can be used directly for GClosures or be passed in as the GSignalCMarshaller c_marshaller; argument
       upon creation of signals:

           GClosure *cc_foo, *cc_bar, *cc_baz;

           cc_foo = g_cclosure_new (NULL, foo, NULL);
           g_closure_set_marshal (cc_foo, g_cclosure_user_marshal_VOID__VOID);
           cc_bar = g_cclosure_new (NULL, bar, NULL);
           g_closure_set_marshal (cc_bar, g_cclosure_user_marshal_VOID__INT);
           cc_baz = g_cclosure_new (NULL, baz, NULL);
           g_closure_set_marshal (cc_baz, g_cclosure_user_marshal_FLOAT__BOOLEAN_UCHAR);

SEE ALSO

       glib-mkenums(1)

GObject                                                                                       GLIB-GENMARSHAL(1)