03-28-2019
Quote:
Originally Posted by
Corona688
It's necessary sometimes, if you're building an operating system for example, to insert special instructions here and there without the compiler's interference. That's the kind of thing asm() is for. gcc will insert raw assembly if you ask, but you really have to know what you're doing since it can't protect you( though some more advanced syntax lets you warn gcc about side-effects instead). Plain, non-ASM goto (yes, it exists, very rarely used) wouldn't let you jump out of bounds.
As I have said in the distant past that I have coded assembly in 16 and 32 bit intel architecture but no experience in 64 bit, although I suspect there is not much difference.
And, I would only use it for mission critical stuff of which these days there is no need as HW interface APIs are usually far more than good enough for this purpose especially as the UNIX ethos is that everything is a file.
One thing for sure I am getting to know how gcc __thinks__ and compared to say Dice-C or VBCC for the AMIGA it is mega-powerful.
And finally I know that 'goto' is local to the function that uses it, and a good thing it is too.
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LEARN ABOUT NETBSD
__builtin_object_size
__BUILTIN_OBJECT_SIZE(3) BSD Library Functions Manual __BUILTIN_OBJECT_SIZE(3)
NAME
__builtin_object_size -- return the size of the given object
SYNOPSIS
size_t
__builtin_object_size(void *ptr, int type);
DESCRIPTION
The __builtin_object_size() function is a gcc(1) built-in function that returns the size of the ptr object if known at compile time and the
object does not have any side effects.
RETURN VALUES
If the size of the object is not known or it has side effects the __builtin_object_size() function returns:
(size_t)-1 for type 0 and 1.
(size_t)0 for type 2 and 3.
If the size of the object is known, then the __builtin_object_size() function returns the maximum size of all the objects that the compiler
knows that they can be pointed to by ptr when type & 2 == 0, and the minimum size when type & 2 != 0.
SEE ALSO
gcc(1), __builtin_return_address(3), attribute(3), ssp(3)
HISTORY
The __builtin_object_size() appeared in GCC 4.1.
CAVEATS
This is a non-standard, compiler-specific extension.
BSD
December 19, 2010 BSD