nuttx/libs/libc/misc/lib_cxx_initialize.c

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/****************************************************************************
* libs/libc/misc/lib_cxx_initialize.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <assert.h>
#include <debug.h>
#include <sched.h>
#include <stdlib.h>
#include "libc.h"
/****************************************************************************
* Private Types
****************************************************************************/
/* This type defines one entry in initialization array */
typedef CODE void (*initializer_t)(void);
/****************************************************************************
* External References
****************************************************************************/
/* _sinit and _einit are symbols exported by the linker script that mark the
* beginning and the end of the C++ initialization section.
*/
extern initializer_t _sinit;
extern initializer_t _einit;
/* _stext and _etext are symbols exported by the linker script that mark the
* beginning and the end of text.
*/
extern uintptr_t _stext;
extern uintptr_t _etext;
#if defined(CONFIG_ARCH_SIM) && defined(CONFIG_HOST_MACOS)
extern void macho_call_saved_init_funcs(void);
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: lib_cxx_initialize
*
* Description:
* If C++ and C++ static constructors are supported, then this function
* must be provided by board-specific logic in order to perform
* initialization of the static C++ class instances.
*
* This function should then be called in the application-specific
* user_start logic in order to perform the C++ initialization. NOTE
* that no component of the core NuttX RTOS logic is involved; this
* function definition only provides the 'contract' between application
* specific C++ code and platform-specific toolchain support.
*
****************************************************************************/
void lib_cxx_initialize(void)
{
#ifdef CONFIG_HAVE_CXXINITIALIZE
static int inited = 0;
if (inited == 0)
{
#if defined(CONFIG_ARCH_SIM) && defined(CONFIG_HOST_MACOS)
macho_call_saved_init_funcs();
#else
initializer_t *initp;
sinfo("_sinit: %p _einit: %p _stext: %p _etext: %p\n",
&_sinit, &_einit, &_stext, &_etext);
/* Visit each entry in the initialization table */
for (initp = &_sinit; initp != &_einit; initp++)
{
initializer_t initializer = *initp;
sinfo("initp: %p initializer: %p\n", initp, initializer);
/* Make sure that the address is non-NULL and lies in the text
* region defined by the linker script. Some toolchains may put
* NULL values or counts in the initialization table.
*/
if ((FAR void *)initializer >= (FAR void *)&_stext &&
(FAR void *)initializer < (FAR void *)&_etext)
{
sinfo("Calling %p\n", initializer);
initializer();
}
}
#endif
inited = 1;
}
#endif
}