Confirmation..K2Rt
Tuesday, December 4, 2018
ability to test various
assumptions and invariants in runtime when compiling the appli
cation in DEBUG mode and
remove the checks when compiling the application in RELEASE mode. T
he standard C++
reuses
assert()
macro from standard C library.
#include
...
assert(some_condition);
The
assert()
macro evaluates to nothing in case
NDEBUG
symbol is defined, otherwise it
evaluates the condition. If the condition doesn't return
true
, it calls the
__assert_fail
function, provided by standard library, which in turn calls
printf
to print error message to
standard output followed by the call to
abort
function, which is supposed to terminate an
application.
Both
printf
and
abort
functions are provided by standard library. However,
printf
will
require the implementation of
_write
function to print characters to the debug output
terminal, and
abort
will require implementation of
_exit
function to terminate the
application.
If standard library is excluded from the compilation (using
-nostdlib
compilation option),
the compilation will fail with "undefined reference to
__assert_func
" error message. The
developer will have to implement this function with correct sig
nature. To retrieve the correct
signature you will have to open
assert.h
standard header provided by your compiler. It will
be something like this:
void
__assert_fail (
const
char
*expr,
const
char
*file,
unsigned
int
line,
const
char
*function) __attribute__ ((__noreturn__));
The attribute specifies that this function doesn't return, so
the compiler will generate a call to
it without setting any address to return to.
The conclusion from all the stated above is that using standa
rd
assert()
macro is possible,
but somewhat inflexible. It is possible to access only global
variables from the functions
described above, i.e. if there is a need to flash a led to
indicate assertion failure, then its
control must be accessible through global variables, which is a b
it ugly. Another
disadvantage of this approach is that there are no convenient
means to change the
behaviour of the assert failure functionality and after a wh
ile restore the original behaviour
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posted by Isaac Hobart at 11:24 AM
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