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PROGRAM:

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 standard input or from files passed as additional arguments on the
command line.

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

(up to 16 PTYPEs may be present).

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.

--body
Generate C code file contents of the marshallers.

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

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

--stdinc
Use the standard marshallers of the GObject library, and include gmarshal.h in
generated header files.

--nostdinc
Do not use the standard marshallers of the GObject library, and skip gmarshal.h
include directive in generated header files.

--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.

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);

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