/**
 * \file
 * Copyright 2014 Xamarin Inc
 * Licensed under the MIT license. See LICENSE file in the project root for full license information.
 */
#ifndef __MONO_METADATA_ABI_DETAILS_H__
#define __MONO_METADATA_ABI_DETAILS_H__

#include <config.h>
#include <glib.h>

/*
 * This file defines macros to compute sizes/alignments/field offsets which depend on
 * the ABI. It is needed during cross compiling since the generated code needs to
 * contain offsets which correspond to the ABI of the target, not the host.
 * It defines the following macros:
 * - MONO_ABI_SIZEOF(type) for every basic type
 * - MONO_ABI_ALIGNOF(type) for every basic type
 * - MONO_STRUCT_OFFSET(struct, field) for various runtime structures
 * When not cross compiling, these correspond to the host ABI (i.e. sizeof/offsetof).
 * When cross compiling, these are defined in a generated header file which is
 * generated by the offsets tool in tools/offsets-tool. The name of the file
 * is given by the --with-cross-offsets= configure argument.
 */

#define MONO_ABI_ALIGNOF(type) MONO_ALIGN_ ## type
#define MONO_CURRENT_ABI_ALIGNOF_TYPEDEF(type) typedef struct { char c; type x; } Mono_Align_Struct_ ##type;
#define MONO_CURRENT_ABI_ALIGNOF(type) ((int)G_STRUCT_OFFSET(Mono_Align_Struct_ ##type, x))
#define MONO_ABI_SIZEOF(type) MONO_SIZEOF_ ## type
#define MONO_CURRENT_ABI_SIZEOF(type) ((int)sizeof(type))

#undef DECL_OFFSET
#undef DECL_OFFSET2
#define DECL_OFFSET(struct,field) MONO_OFFSET_ ## struct ## _ ## field = -1,
#define DECL_OFFSET2(struct,field,offset) MONO_OFFSET_ ## struct ## _ ## field = offset,
#define DECL_ALIGN(type) MONO_ALIGN_ ##type = MONO_CURRENT_ABI_ALIGNOF (type),
#define DECL_ALIGN2(type,size) MONO_ALIGN_ ##type = size,
#define DECL_SIZE(type) MONO_SIZEOF_ ##type = MONO_CURRENT_ABI_SIZEOF (type),
#define DECL_SIZE2(type,size) MONO_SIZEOF_ ##type = size,

/* Needed by MONO_CURRENT_ABI_ALIGNOF */
MONO_CURRENT_ABI_ALIGNOF_TYPEDEF(gint8)
MONO_CURRENT_ABI_ALIGNOF_TYPEDEF(gint16)
MONO_CURRENT_ABI_ALIGNOF_TYPEDEF(gint32)
MONO_CURRENT_ABI_ALIGNOF_TYPEDEF(gint64)
MONO_CURRENT_ABI_ALIGNOF_TYPEDEF(float)
MONO_CURRENT_ABI_ALIGNOF_TYPEDEF(double)
MONO_CURRENT_ABI_ALIGNOF_TYPEDEF(gpointer)

enum {
#include "object-offsets.h"
};

#ifdef USED_CROSS_COMPILER_OFFSETS
#define MONO_STRUCT_OFFSET(struct,field) MONO_OFFSET_ ## struct ## _ ## field
#else
#if defined(HAS_CROSS_COMPILER_OFFSETS) || defined(MONO_CROSS_COMPILE)
#define MONO_STRUCT_OFFSET(struct,field) (MONO_OFFSET_ ## struct ## _ ## field == -1, G_STRUCT_OFFSET (struct,field))
#else
#define MONO_STRUCT_OFFSET(struct,field) G_STRUCT_OFFSET (struct,field)
#endif
#endif

#endif