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/*
* Copyright (C) 2015 Michael Brown <mbrown@fensystems.co.uk>.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
* You can also choose to distribute this program under the terms of
* the Unmodified Binary Distribution Licence (as given in the file
* COPYING.UBDL), provided that you have satisfied its requirements.
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
/** @file
*
* setjmp()/longjmp() tests
*
*/
/* Forcibly enable assertions */
#undef NDEBUG
#include <stddef.h>
#include <assert.h>
#include <setjmp.h>
#include <ipxe/test.h>
/** A setjmp()/longjmp() test */
struct setjmp_test {
/** Jump buffer */
jmp_buf env;
/** Expected value */
int expected;
/** Test code file */
const char *file;
/** Test code line */
unsigned int line;
};
/** Expected jump */
static struct setjmp_test *jumped;
/**
* Report a setjmp() test result
*
* @v test setjmp()/longjmp() test
*
* This has to be implemented as a macro since if it were a function
* then the context saved by setjmp() would be invalidated when the
* function returned.
*/
#define setjmp_ok( test ) do { \
int value; \
/* Sanity check */ \
assert ( jumped == NULL ); \
/* Initialise test */ \
(test)->expected = 0; \
(test)->file = __FILE__; \
(test)->line = __LINE__; \
/* Perform setjmp() */ \
value = setjmp ( (test)->env ); \
/* Report setjmp()/longjmp() result */ \
setjmp_return_ok ( (test), value ); \
} while ( 0 )
/**
* Report a setjmp()/longjmp() test result
*
* @v test setjmp()/longjmp() test
* @v value Value returned from setjmp()
*
* This function ends up reporting results from either setjmp() or
* longjmp() tests (since calls to longjmp() will return via the
* corresponding setjmp()). It therefore uses the test code file and
* line stored in the test structure, which will represent the line
* from which either setjmp() or longjmp() was called.
*/
static void setjmp_return_ok ( struct setjmp_test *test, int value ) {
/* Determine whether this was reached via setjmp() or longjmp() */
if ( value == 0 ) {
/* This is the initial call to setjmp() */
okx ( test->expected == 0, test->file, test->line );
okx ( jumped == NULL, test->file, test->line );
} else {
/* This is reached via a call to longjmp() */
okx ( value == test->expected, test->file, test->line );
okx ( jumped == test, test->file, test->line );
}
/* Clear expected jump */
jumped = NULL;
}
/**
* Report a longjmp() test result
*
* @v test setjmp()/longjmp() test
* @v file Test code file
* @v line Test code line
*/
static void longjmp_okx ( struct setjmp_test *test, int value,
const char *file, unsigned int line ) {
/* Record expected value. A zero passed to longjmp() should
* result in setjmp() returning a value of one.
*/
test->expected = ( value ? value : 1 );
/* Record test code file and line */
test->file = file;
test->line = line;
/* Record expected jump */
jumped = test;
/* Perform longjmp(). Should return via setjmp_okx() */
longjmp ( test->env, value );
/* longjmp() should never return */
assert ( 0 );
}
#define longjmp_ok( test, value ) \
longjmp_okx ( test, value, __FILE__, __LINE__ )
/**
* Perform setjmp()/longjmp() self-tests
*
*/
static void setjmp_test_exec ( void ) {
static struct setjmp_test alpha;
static struct setjmp_test beta;
static int iteration;
/* This is one of the very few situations in which the
* "for-case" pattern is justified.
*/
for ( iteration = 0 ; iteration < 10 ; iteration++ ) {
DBGC ( jumped, "SETJMP test iteration %d\n", iteration );
switch ( iteration ) {
case 0: setjmp_ok ( &alpha ); break;
case 1: setjmp_ok ( &beta ); break;
case 2: longjmp_ok ( &alpha, 0 );
case 3: longjmp_ok ( &alpha, 1 );
case 4: longjmp_ok ( &alpha, 2 );
case 5: longjmp_ok ( &beta, 17 );
case 6: longjmp_ok ( &beta, 29 );
case 7: longjmp_ok ( &alpha, -1 );
case 8: longjmp_ok ( &beta, 0 );
case 9: longjmp_ok ( &beta, 42 );
}
}
}
/** setjmp()/longjmp() self-test */
struct self_test setjmp_test __self_test = {
.name = "setjmp",
.exec = setjmp_test_exec,
};
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