Hi,
On 7/15/22 17:10, Maarten Brock wrote:
Philipp Klaus Krause schreef op 2022-07-15 16:45:
Since people like form 1, I'd now think we should keep it, but drop
#pragma sdcc_hash. That looks like a better way forward and also
solves the issues.
When this pragma is dropped does that mean it is no longer possible
to use the # for an immediate operand?
You can still use a plain # (it already works now without using the
pragma):
void h(void)
{
__asm
add a, #3
__endasm;
}
Or will it be limited to use outside of a macro? I wouldn't even
know how to escape the #.
The C standard requires "Each # preprocessing token in the replacement
list for a function-like macro shall be followed by a parameter as the
next preprocessing token in the replacement list." (see section
6.10.3.2 of the current C2X standard N2912). Which makes sense, since
in the standard, # is meant for stringizing macro arguments. The
#pragma sdcc_hash is used to overide that.
lib/ds400/ds400.rom.c currently has the following lines:
// This macro is invalid for the standard C preprocessor, since it
// includes a hash character in the expansion, hence the SDCC specific
// pragma.
#pragma sdcc_hash +
#define ROMCALL(x) \
mov R6_B3, #(x & 0xff) \
mov R7_B3, #((x >> 8) & 0xff) \
lcall __romcall
And then uses this macro from within __asm / __endasm. This will have
to be changed to e.g.:
#define HASH #
#define ROMCALL(x) \
mov R6_B3, HASH(x & 0xff) \
mov R7_B3, HASH((x >> 8) & 0xff) \
lcall __romcall
Philipp
Ok, so the proper way to 'escape' the # inside a macro definition is
by using another macro.
That is fine by me. We should probably put this in the manual even
though it is standard compliant.
Maarten
I agree, it is very acceptable to change the literal hash into a nested
macro.
Sebastien
_______________________________________________
Sdcc-user mailing list
Sdcc-user@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/sdcc-user
_______________________________________________
Sdcc-user mailing list
Sdcc-user@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/sdcc-user
