uxn

Varvara Ordinator, written in ANSI C(SDL2)
git clone https://git.eamoncaddigan.net/uxn.git
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commit 1bba517f3716e166a0d52224f43c100b44b12289
parent 124d0bf193ab8473a53c970c89bf39876cfb1429
Author: Devine Lu Linvega <aliceffekt@gmail.com>
Date:   Mon, 19 Feb 2024 10:35:28 -0800

(abc-disp) Added dispatch table implementation core

Diffstat:
Aetc/cores/uxn-abc-disp.c | 86+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 86 insertions(+), 0 deletions(-)

diff --git a/etc/cores/uxn-abc-disp.c b/etc/cores/uxn-abc-disp.c @@ -0,0 +1,85 @@ +#include "uxn.h" + +/* +Copyright (u) 2022-2023 Devine Lu Linvega, Andrew Alderwick, Andrew Richards + +Permission to use, copy, modify, and distribute this software for any +purpose with or without fee is hereby granted, provided that the above +copyright notice and this permission notice appear in all copies. + +THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES +WITH REGARD TO THIS SOFTWARE. +*/ + +#define FLIP { s = ins & 0x40 ? &u->wst : &u->rst; } +#define JUMP(x) { if(m2) pc = (x); else pc += (Sint8)(x); } +#define POP1(o) { o = s->dat[--*sp]; } +#define POP2(o) { o = s->dat[--*sp] | (s->dat[--*sp] << 0x8); } +#define POPx(o) { if(m2) { POP2(o) } else POP1(o) } +#define PUSH1(y) { s->dat[s->ptr++] = (y); } +#define PUSH2(y) { tt = (y); s->dat[s->ptr++] = tt >> 0x8; s->dat[s->ptr++] = tt; } +#define PUSHx(y) { if(m2) { PUSH2(y) } else PUSH1(y) } +#define PEEK(o, x, r) { if(m2) { r = (x); o = ram[r++] << 8 | ram[r]; } else o = ram[(x)]; } +#define POKE(x, y, r) { if(m2) { r = (x); ram[r++] = y >> 8; ram[r] = y; } else ram[(x)] = (y); } +#define DEVR(o, p) { if(m2) { o = (emu_dei(u, p) << 8) | emu_dei(u, p + 1); } else o = emu_dei(u, p); } +#define DEVW(p, y) { if(m2) { emu_deo(u, p, y >> 8); emu_deo(u, p + 1, y); } else emu_deo(u, p, y); } +#define next { ins = ram[pc++]; \ + m2 = ins & 0x20; \ + s = ins & 0x40 ? &u->rst : &u->wst; \ + if(ins & 0x80) kp = s->ptr, sp = &kp; else sp = &s->ptr; \ + goto *lut[ins & 0x1f]; } + +int +uxn_eval(Uxn *u, Uint16 pc) +{ + Uint8 t, kp, *sp, ins, m2, *ram = u->ram; + Uint16 tt, a, b, c; + Stack *s; + static void* lut[] = { + &&_imm, &&_inc, &&_pop, &&_nip, &&_swp, &&_rot, &&_dup, &&_ovr, + &&_equ, &&_neq, &&_gth, &&_lth, &&_jmp, &&_jcn, &&_jsr, &&_sth, + &&_ldz, &&_stz, &&_ldr, &&_str, &&_lda, &&_sta, &&_dei, &&_deo, + &&_add, &&_sub, &&_mul, &&_div, &&_and, &&_ora, &&_eor, &&_sft }; + if(!pc || u->dev[0x0f]) return 0; + next + _imm: + switch(ins) { + case 0x00: /* BRK */ return 1; + case 0x20: /* JCI */ POP1(b) if(!b) { pc += 2; break; } + case 0x40: /* JMI */ a = ram[pc++] << 8 | ram[pc++]; pc += a; break; + case 0x60: /* JSI */ PUSH2(pc + 2) a = ram[pc++] << 8 | ram[pc++]; pc += a; break; + case 0x80: case 0xc0: /* LIT */ PUSH1(ram[pc++]) break; + case 0xa0: case 0xe0: /* LIT2 */ PUSH1(ram[pc++]) PUSH1(ram[pc++]) break; + } next + _inc: POPx(a) PUSHx(a + 1) next + _pop: POPx(a) next + _nip: POPx(a) POPx(b) PUSHx(a) next + _swp: POPx(a) POPx(b) PUSHx(a) PUSHx(b) next + _rot: POPx(a) POPx(b) POPx(c) PUSHx(b) PUSHx(a) PUSHx(c) next + _dup: POPx(a) PUSHx(a) PUSHx(a) next + _ovr: POPx(a) POPx(b) PUSHx(b) PUSHx(a) PUSHx(b) next + _equ: POPx(a) POPx(b) PUSH1(b == a) next + _neq: POPx(a) POPx(b) PUSH1(b != a) next + _gth: POPx(a) POPx(b) PUSH1(b > a) next + _lth: POPx(a) POPx(b) PUSH1(b < a) next + _jmp: POPx(a) JUMP(a) next + _jcn: POPx(a) POP1(b) if(b) JUMP(a) next + _jsr: POPx(a) FLIP PUSH2(pc) JUMP(a) next + _sth: POPx(a) FLIP PUSHx(a) next + _ldz: POP1(a) PEEK(b, a, t) PUSHx(b) next + _stz: POP1(a) POPx(b) POKE(a, b, t) next + _ldr: POP1(a) PEEK(b, pc + (Sint8)a, tt) PUSHx(b) next + _str: POP1(a) POPx(b) POKE(pc + (Sint8)a, b, tt) next + _lda: POP2(a) PEEK(b, a, tt) PUSHx(b) next + _sta: POP2(a) POPx(b) POKE(a, b, tt) next + _dei: POP1(a) DEVR(b, a) PUSHx(b) next + _deo: POP1(a) POPx(b) DEVW(a, b) next + _add: POPx(a) POPx(b) PUSHx(b + a) next + _sub: POPx(a) POPx(b) PUSHx(b - a) next + _mul: POPx(a) POPx(b) PUSHx(b * a) next + _div: POPx(a) POPx(b) PUSHx(a ? b / a : 0) next + _and: POPx(a) POPx(b) PUSHx(b & a) next + _ora: POPx(a) POPx(b) PUSHx(b | a) next + _eor: POPx(a) POPx(b) PUSHx(b ^ a) next + _sft: POP1(a) POPx(b) PUSHx(b >> (a & 0xf) << (a >> 4)) next +} +\ No newline at end of file