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/******************************** -*- C -*- ****************************
*
* External definitions for C - Smalltalk interface module
*
*
***********************************************************************/
/***********************************************************************
*
* Copyright 1988,89,90,91,92,94,95,99,2000,2001,2002,2006
* Free Software Foundation, Inc.
* Written by Steve Byrne.
*
* This file is part of GNU Smalltalk.
*
* GNU Smalltalk is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2, or (at your option) any later
* version.
*
* Linking GNU Smalltalk statically or dynamically with other modules is
* making a combined work based on GNU Smalltalk. Thus, the terms and
* conditions of the GNU General Public License cover the whole
* combination.
*
* In addition, as a special exception, the Free Software Foundation
* give you permission to combine GNU Smalltalk with free software
* programs or libraries that are released under the GNU LGPL and with
* independent programs running under the GNU Smalltalk virtual machine.
*
* You may copy and distribute such a system following the terms of the
* GNU GPL for GNU Smalltalk and the licenses of the other code
* concerned, provided that you include the source code of that other
* code when and as the GNU GPL requires distribution of source code.
*
* Note that people who make modified versions of GNU Smalltalk are not
* obligated to grant this special exception for their modified
* versions; it is their choice whether to do so. The GNU General
* Public License gives permission to release a modified version without
* this exception; this exception also makes it possible to release a
* modified version which carries forward this exception.
*
* GNU Smalltalk is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* GNU Smalltalk; see the file COPYING. If not, write to the Free Software
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
***********************************************************************/
#ifndef GST_CINT_H
#define GST_CINT_H
typedef enum
{ /* types for C parameters */
CDATA_CHAR,
CDATA_UCHAR,
CDATA_SHORT,
CDATA_USHORT,
CDATA_LONG,
CDATA_ULONG,
CDATA_FLOAT,
CDATA_DOUBLE,
CDATA_STRING,
CDATA_OOP, /* no conversion to-from C (OOP) */
CDATA_INT,
CDATA_UINT,
CDATA_LONG_DOUBLE,
CDATA_UNKNOWN, /* when there is no type a priori */
CDATA_STRING_OUT, /* for things that modify string params */
CDATA_SYMBOL,
CDATA_BYTEARRAY,
CDATA_BYTEARRAY_OUT,
CDATA_BOOLEAN,
CDATA_VOID, /* valid only as a return type */
CDATA_VARIADIC, /* for parameters, this param is an
array to be interpreted as
arguments. Note that only simple
conversions are performed in this
case. */
CDATA_VARIADIC_OOP, /* for parameters, this param is an
array whose elements are OOPs to be
passed. */
CDATA_COBJECT, /* a C object is being passed */
CDATA_COBJECT_PTR, /* a C object pointer is being passed */
CDATA_SELF, /* pass self as the corresponding
argument */
CDATA_SELF_OOP, /* pass self as an OOP */
CDATA_WCHAR,
CDATA_WSTRING,
CDATA_WSTRING_OUT,
CDATA_SYMBOL_OUT
}
cdata_type;
/* Value of errno which is checked by the Smalltalk base classes. */
extern int _gst_errno
ATTRIBUTE_HIDDEN;
/* Element type for the name-to-C-function mapping table. */
typedef void (*p_void_func) ();
typedef struct gst_cfunc_descriptor
{
OBJ_HEADER;
OOP cFunction; /* gst_cobject whose C value is func
addr */
OOP cFunctionName; /* Name of C function in mapping table */
OOP returnType; /* Smalltalk return type */
OOP numFixedArgs; /* number of real arguments passed from
smalltalk (excluding "self" parameters
which are synthetically added when
calling the C function). */
OOP argTypes[1]; /* variable length, really numFixedArgs
long */
}
*gst_cfunc_descriptor;
/* Invokes a C routine. Arguments passed from Smalltalk are stored starting
from ARGS, and the object to which the message that called-out was
sent is RECEIVER. CFUNCOOP is the C function descriptor used
to control the mapping of argument types from Smalltalk to C types
and determines the mapping of the C function's return type into a
Smalltalk type. The result is NULL if the call was not successful,
an OOP holding the result otherwise. */
extern OOP _gst_invoke_croutine (OOP cFuncOOP,
OOP receiver,
OOP *args)
ATTRIBUTE_HIDDEN;
/* Defines the mapping between a string function name FUNCNAME and the
address FUNCADDR of that function, for later use in
lookup_function. The mapping table will expand as needed to
hold new entries as they are added. */
extern void _gst_define_cfunc (const char *funcName, PTR funcAddr)
ATTRIBUTE_HIDDEN;
/* Adds to the mapping table the standard C functions supported by
GNU Smalltalk. */
extern void _gst_init_cfuncs (void)
ATTRIBUTE_HIDDEN;
/* Makes a C based descriptor for a callout method. Returns a
gst_cfunc_descriptor object which holds onto the descriptor. This
descriptor is subsequently used when the called out function
FUNCNAMEOOP (a Smalltalk String) is invoked. RETURNOOP is a Symbol
or CType which indicates the return type and ARGSOOP is a Smalltalk
Array containing the argument types (as Symbols). */
extern OOP _gst_make_descriptor (OOP funcNameOOP,
OOP returnTypeOOP,
OOP argsOOP)
ATTRIBUTE_HIDDEN;
/* Set the value of errno which is checked by Smalltalk to be errnum. */
extern void _gst_set_errno(int errnum)
ATTRIBUTE_HIDDEN;
#endif /* GST_CINT_H */
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