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 DEBIAN
trampoline
TRAMPOLINE(3) Library Functions Manual TRAMPOLINE(3)
NAME
trampoline - closures as first-class C functions
SYNOPSIS
#include <trampoline.h>
function = alloc_trampoline(address, variable, data);
free_trampoline(function);
is_trampoline(function)
trampoline_address(function)
trampoline_variable(function)
trampoline_data(function)
DESCRIPTION
These functions implement closures as first-class C functions. A closure consists of a regular C function and a piece of data which gets
passed to the C function when the closure is called.
Closures as first-class C functions means that they fit into a function pointer and can be called exactly like any other C function. func-
tion = alloc_trampoline(address, variable, data) allocates a closure. When function gets called, it stores data in the variable variable
and calls the C function at address. The function at address is responsible for fetching data out of variable immediately, before execu-
tion of any other function call.
This is much like gcc's local functions, except that the GNU C local functions have dynamic extent (i.e. are deallocated when the creating
function returns), while trampoline provides functions with indefinite extent: function is only deallocated when free_trampoline(function)
is called.
is_trampoline(function) checks whether the C function function was produced by a call to alloc_trampoline. If this returns true, the argu-
ments given to alloc_trampoline can be retrieved:
trampoline_address(function) returns address,
trampoline_variable(function) returns variable,
trampoline_data(function) returns data.
SEE ALSO
gcc(1), varargs(3), callback(3)
BUGS
Passing the data through a global variable is not reentrant. Don't call trampoline functions from within signal handlers. This is fixed in
the callback(3) package.
PORTING
The way gcc builds local functions is described in the gcc source, file gcc-2.6.3/config/cpu/cpu.h.
AUTHOR
Bruno Haible <bruno@clisp.org>
ACKNOWLEDGEMENTS
Many ideas were cribbed from the gcc source.
25 October 1997 TRAMPOLINE(3)