Jan Hubicka [EMAIL PROTECTED] writes:
[...]
static inline void __attribute__((noreturn)) BUG(void)
{
__asm__ __volatile__(trap);
__builtin_unreached();
This is bit dificult to do in general since it introduces new kind of
control flow construct. It would be better to express such
In an OS kernel functions that do not return are commonly used and
practically always their code is beyond gcc's ability to recognize
noreturn functions. A typical example would for example be the BUG()
function in Linux which is implemented as something like:
static inline void
In an OS kernel functions that do not return are commonly used and
practically always their code is beyond gcc's ability to recognize
noreturn functions. A typical example would for example be the BUG()
function in Linux which is implemented as something like:
static inline void
Back in 2000 I wrote a really simple patch that caused gcc to treat an
ASM_OPERANDS that clobbered pc as a control flow barrier, exactly
for this problem.
http://gcc.gnu.org/ml/gcc-patches/2000-01/msg00190.html
I still think it was a good idea, but at the time it was received
Zack Weinberg wrote:
Back in 2000 I wrote a really simple patch that caused gcc to treat an
ASM_OPERANDS that clobbered pc as a control flow barrier, exactly
for this problem.
http://gcc.gnu.org/ml/gcc-patches/2000-01/msg00190.html
I still think it was a good idea, but at the time it was
Zack Weinberg [EMAIL PROTECTED] writes:
Back in 2000 I wrote a really simple patch that caused gcc to treat an
ASM_OPERANDS that clobbered pc as a control flow barrier, exactly
for this problem.
http://gcc.gnu.org/ml/gcc-patches/2000-01/msg00190.html
I still think it was a good idea, but
On Tue, Feb 06, 2007 at 04:14:30PM -0800, Ian Lance Taylor wrote:
I also think it would be good to have one option affecting it: turn
__builtin_unreachable() into an abort(), or turn it into a cannot be
reached marker. I think the former should be the default at -O0, the
latter at -O1 and
Joe Buck [EMAIL PROTECTED] writes:
On Tue, Feb 06, 2007 at 04:14:30PM -0800, Ian Lance Taylor wrote:
I also think it would be good to have one option affecting it: turn
__builtin_unreachable() into an abort(), or turn it into a cannot be
reached marker. I think the former should be the
On Feb 6, 2007, at 5:06 PM, Joe Buck wrote:
On Tue, Feb 06, 2007 at 04:14:30PM -0800, Ian Lance Taylor wrote:
I also think it would be good to have one option affecting it: turn
__builtin_unreachable() into an abort(), or turn it into a cannot be
reached marker. I think the former should be
