kernel/nanokernel/ctors.c

/* ctors.c - constructor module */

/*
 * Copyright (c) 2012-2014 Wind River Systems, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1) Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * 2) Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3) Neither the name of Wind River Systems nor the names of its contributors
 * may be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

/*
DESCRIPTION
This module provides the C++ style constructor mechanism used by various
components to initialize themselves automatically.

The _Ctors() routine is called from the nanokernel's _Cstart() routine after
hardware initialization has completed.

Although ctors are traditionally a C++ feature, normal C code can use them too
through the appropriate use of GCC's constructor attribute.
No destructor support (dtors) is provided.
 */

/* What a constructor function pointer looks like */

typedef void (*CtorFuncPtr)(void);

/* Constructor function pointer list is generated by the linker script. */

extern CtorFuncPtr __CTOR_LIST__[];
extern CtorFuncPtr __CTOR_END__[];

/**
 *
 * @brief Invoke all C++ style global object constructors
 *
 * This routine is invoked by the nanokernel routine _Cstart() after the basic
 * hardware has been initialized.
 */

void _Ctors(void)
{
	unsigned int nCtors;

	nCtors = (unsigned int)__CTOR_LIST__[0];

	while (nCtors >= 1) {
		__CTOR_LIST__[nCtors--]();
	}
}