var_export.h
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/*
* Copyright (c) 2006-2022, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2021-06-04 WillianChan first version
* 2021-06-08 WillianChan support to MS VC++ compiler
*/
#ifndef _VAR_EXPORT_H__
#define _VAR_EXPORT_H__
#include <rtthread.h>
/* exported object */
struct ve_exporter
{
const char *module; /* module name */
const char *identifier; /* module identifier */
rt_base_t value; /* module value */
};
typedef struct ve_exporter ve_exporter_t;
/* module object */
struct ve_module
{
const ve_exporter_t *begin; /* the first module of the same name */
const ve_exporter_t *end; /* the last module of the same */
};
typedef struct ve_module ve_module_t;
/* iterator object */
struct ve_iterator
{
const ve_exporter_t *exp_index; /* iterator index */
const ve_exporter_t *exp_end; /* iterate over exporter */
};
typedef struct ve_iterator ve_iterator_t;
#define VE_NOT_FOUND (0xFFFFFFFFu) /* not found */
/* exporter's export command */
#if defined(__ARMCC_VERSION) || defined(__IAR_SYSTEMS_ICC__)
#define VAR_EXPORT(module, identi, value) \
const char _vexp_##identi##_module[] RT_SECTION(".rodata.vexp") = #module; \
const char _vexp_##identi##_identi[] RT_SECTION(".rodata.vexp") = #identi; \
RT_USED const struct ve_exporter _vexp_##module##identi \
RT_SECTION("1."#module".VarExpTab."#identi) = \
{ \
_vexp_##identi##_module, \
_vexp_##identi##_identi, \
value, \
}
#elif defined(__GNUC__)
#define VAR_EXPORT(module, identi, value) \
const char _vexp_##identi##_module[] RT_SECTION(".rodata.vexp") = #module; \
const char _vexp_##identi##_identi[] RT_SECTION(".rodata.vexp") = #identi; \
RT_USED const struct ve_exporter _vexp_##module##identi \
RT_SECTION(#module".VarExpTab."#identi) = \
{ \
_vexp_##identi##_module, \
_vexp_##identi##_identi, \
value, \
}
#elif defined(_MSC_VER)
#pragma section("VarExpTab$f",read)
#define VAR_EXPORT(module, identi, value) \
const char _vexp_##identi##_module[] RT_SECTION(".rodata.vexp") = #module; \
const char _vexp_##identi##_identi[] RT_SECTION(".rodata.vexp") = #identi; \
__declspec(allocate("VarExpTab$f")) \
RT_USED const struct ve_exporter _vexp_##module##identi = \
{ \
_vexp_##identi##_module, \
_vexp_##identi##_identi, \
value, \
}
#endif
/* initialize var export */
int ve_exporter_init(void);
/* initialize module */
int ve_module_init(ve_module_t *mod, const char *module);
/* initialize iterator */
void ve_iter_init(ve_module_t *mod, ve_iterator_t *iter);
/* iterate backward */
const ve_exporter_t *ve_iter_next(ve_iterator_t *iter);
/* get the value by identifier */
rt_base_t ve_value_get(ve_module_t *mod, const char *identifier);
/* check if this value exists in the module*/
rt_bool_t ve_value_exist(ve_module_t *mod, const char *identifier);
#endif /* _VAR_EXPORT_H__ */