dyncall_args_x86.c

/*
 Package: dyncall
 Library: dyncallback
 File: dyncallback/dyncall_args_x86.c
 Description: Callback's Arguments VM - Implementation for x86
 License:
 Copyright (c) 2007-2009 Daniel Adler <dadler@uni-goettingen.de>,
                         Tassilo Philipp <tphilipp@potion-studios.com>

 Permission to use, copy, modify, and distribute this software for any
 purpose with or without fee is hereby granted, provided that the above
 copyright notice and this permission notice appear in all copies.

 THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

*/
#include "dyncall_args_x86.h"

// ----------------------------------------------------------------------------
// C API implementation:

// base operations:

DCint      dcbArgInt     (DCArgs* p) { return p->vt->i32(p); }
DClonglong dcbArgLongLong(DCArgs* p) { return p->vt->i64(p); }
DCfloat    dcbArgFloat   (DCArgs* p) { return p->vt->f32(p); }
DCdouble   dcbArgDouble  (DCArgs* p) { return p->vt->f64(p); }

// promote to integer: bool, char, short, long and pointer

DCbool     dcbArgBool    (DCArgs* p) { return ( dcbArgInt(p) == 0 ) ? 0 : 1; }
DCchar     dcbArgChar    (DCArgs* p) { return (char)      dcbArgInt(p); }
DCshort    dcbArgShort   (DCArgs* p) { return (short)     dcbArgInt(p); }
DClong     dcbArgLong    (DCArgs* p) { return (long)      dcbArgInt(p); }
DCpointer  dcbArgPointer (DCArgs* p) { return (DCpointer) dcbArgInt(p); }

// unsigned types

DCuint      dcbArgUInt     (DCArgs* p) { return (DCuint)      dcbArgInt(p); }
DCuchar     dcbArgUChar    (DCArgs* p) { return (DCuchar)     dcbArgChar(p); }
DCushort    dcbArgUShort   (DCArgs* p) { return (DCushort)    dcbArgShort(p); }
DCulong     dcbArgULong    (DCArgs* p) { return (DCulong)     dcbArgLong(p); }
DCulonglong dcbArgULongLong(DCArgs* p) { return (DCulonglong) dcbArgLongLong(p); }

// ----------------------------------------------------------------------------
// virtual tables:

// cdecl calling convention

static int default_i32(DCArgs* args)
{
	return *args->stack_ptr++;
}

static long long default_i64(DCArgs* args)
{
	long long result = * (long long*) args->stack_ptr;
	args->stack_ptr += 2;
	return result;
}

static float default_f32(DCArgs* args)
{
	float result = * ( (float*) args->stack_ptr );
	args->stack_ptr++;
	return result;
}

static double default_f64(DCArgs* args)
{
	double result = * ( (double*) args->stack_ptr );
	args->stack_ptr += 2;
	return  result;
}

DCArgsVT dcArgsVT_default   = { default_i32, default_i64, default_f32, default_f64 };

// fastcall (microsoft) calling convention:

static int fast_i32(DCArgs* args)
{
	if (args->fast_count < 2)
		return args->fast_data[args->fast_count++];
	else
		return default_i32(args);
}

DCArgsVT dcArgsVT_fast_ms = { fast_i32, default_i64, default_f32, default_f64 };

// fastcall (gnu) calling convention

static long long fast_gnu_i64(DCArgs* args)
{
	args->fast_count = 2;
	return default_i64(args);
}

DCArgsVT dcArgsVT_fast_gnu = { fast_i32, fast_gnu_i64, default_f32, default_f64 };