90d1c89bff
* Allow overlap of bit-field storage units
Previously,
struct s {
unsigned int x : 10;
unsigned int y : 10;
};
had sizeof(struct s) == 4.
With this change, allow the storage units of x and y to overlap,
so sizeof(struct s) == 3, with y stored immediately after x,
with no padding between them.
An int bit-field (the only type currently supported) will still
never occupy more than two bytes.
* ParseStructInit: Fix typo and expand comment
Explain why there are at most 30, not 32 bits.
* ParseStructDecl: Rewrite AddBitFieldCall
No behavior change.
Co-authored-by: Jesse Rosenstock <jmr@users.noreply.github.com>
cc65 is a complete cross development package for 65(C)02 systems, including a powerful macro assembler, a C compiler, linker, librarian and several other tools.
cc65 has C and runtime library support for many of the old 6502 machines, including
- the following Commodore machines:
- VIC20
- C16/C116 and Plus/4
- C64
- C128
- CBM 510 (aka P500)
- the 600/700 family
- newer PET machines (not 2001).
- the Apple ][+ and successors.
- the Atari 8-bit machines.
- the Atari 2600 console.
- the Atari 5200 console.
- GEOS for the C64, C128 and Apple //e.
- the Bit Corporation Gamate console.
- the NEC PC-Engine (aka TurboGrafx-16) console.
- the Nintendo Entertainment System (NES) console.
- the Watara Supervision console.
- the VTech Creativision console.
- the Oric Atmos.
- the Oric Telestrat.
- the Lynx console.
- the Ohio Scientific Challenger 1P.
The libraries are fairly portable, so creating a version for other 6502s shouldn't be too much work.