/*
 * FreeRTOS memory safety proofs with CBMC.
 * Copyright (C) 2019 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use, copy,
 * modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * http://aws.amazon.com/freertos
 * http://www.FreeRTOS.org
 */

#include "cbmc.h"

/*
 * Our stub for pvPortMalloc in cbmc.h nondeterministically chooses
 * either to return NULL or to allocate the requested memory.
 */
void vNondetSetCurrentTCB( void )
{
	pxCurrentTCB = pvPortMalloc( sizeof(TCB_t) );
}
/*
 * We just require task lists to be initialized for this proof
 */
void vPrepareTaskLists( void )
{
	__CPROVER_assert_zero_allocation();

	prvInitialiseTaskLists();
}

/*
 * We set the values of relevant global
 * variables to nondeterministic values
 */
void vSetGlobalVariables( void )
{
	xSchedulerRunning = nondet_basetype();
	uxCurrentNumberOfTasks = nondet_ubasetype();
}

/*
 * pvPortMalloc is nondeterministic by definition, thus we do not need
 * to check for NULL allocation in this function
 */
TaskHandle_t *pxNondetSetTaskHandle( void )
{
	TaskHandle_t *pxNondetTaskHandle = pvPortMalloc( sizeof(TaskHandle_t) );
	return pxNondetTaskHandle;
}

/*
 * Tries to allocate a string of size xStringLength and sets the string
 * to be terminated using a nondeterministic index if allocation was successful
 */
char *pcNondetSetString( size_t xStringLength )
{
	char *pcName = pvPortMalloc( xStringLength );

	if ( pcName != NULL ) {
		size_t uNondetIndex;
		__CPROVER_assume( uNondetIndex < xStringLength );
		pcName[uNondetIndex] = '\0';
	}

	return pcName;
}