mirror of https://git.sr.ht/~rabbits/uxn
Refactor uxn.c.
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Andrew Alderwick
parent
ecc2654165
commit
6980abacfc
157
src/uxn.c
157
src/uxn.c
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@ -3,6 +3,7 @@
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/*
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Copyright (u) 2021 Devine Lu Linvega
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Copyright (u) 2021 Andrew Alderwick
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Copyright (u) 2022 Andrew Richards
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Permission to use, copy, modify, and distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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@ -12,125 +13,97 @@ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE.
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*/
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#define MODE_SHORT 0x20
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#define MODE_RETURN 0x40
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#define MODE_KEEP 0x80
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#pragma mark - Operations
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/* clang-format off */
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/* Utilities */
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static void (*uxn_push)(Stack *s, Uint16 a);
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static Uint16 (*uxn_pop8)(Stack *s);
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static Uint16 (*uxn_pop)(Stack *s);
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static void (*uxn_poke)(Uint8 *m, Uint16 a, Uint16 b);
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static Uint16 (*uxn_peek)(Uint8 *m, Uint16 a);
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static void (*uxn_devw)(Device *d, Uint8 a, Uint16 b);
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static Uint16 (*uxn_devr)(Device *d, Uint8 a);
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static void (*uxn_warp)(Uxn *u, Uint16 a);
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static void (*uxn_pull)(Uxn *u);
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/* byte mode */
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static void push8(Stack *s, Uint16 a) { if(s->ptr == 0xff) { s->error = 2; return; } s->dat[s->ptr++] = a; }
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static Uint16 pop8k(Stack *s) { if(s->kptr == 0) { s->error = 1; return 0; } return s->dat[--s->kptr]; }
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static Uint16 pop8d(Stack *s) { if(s->ptr == 0) { s->error = 1; return 0; } return s->dat[--s->ptr]; }
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static void poke8(Uint8 *m, Uint16 a, Uint16 b) { m[a] = b; }
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static Uint16 peek8(Uint8 *m, Uint16 a) { return m[a]; }
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static void devw8(Device *d, Uint8 a, Uint16 b) { d->dat[a & 0xf] = b; d->deo(d, a & 0x0f); }
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static Uint16 devr8(Device *d, Uint8 a) { return d->dei(d, a & 0x0f); }
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static void warp8(Uxn *u, Uint16 a){ u->ram.ptr += (Sint8)a; }
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static void pull8(Uxn *u){ push8(u->src, peek8(u->ram.dat, u->ram.ptr++)); }
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/* short mode */
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static void push16(Stack *s, Uint16 a) { push8(s, a >> 8); push8(s, a); }
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static Uint16 pop16(Stack *s) { Uint8 a = uxn_pop8(s), b = uxn_pop8(s); return a + (b << 8); }
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void poke16(Uint8 *m, Uint16 a, Uint16 b) { poke8(m, a, b >> 8); poke8(m, a + 1, b); }
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Uint16 peek16(Uint8 *m, Uint16 a) { return (peek8(m, a) << 8) + peek8(m, a + 1); }
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static void devw16(Device *d, Uint8 a, Uint16 b) { devw8(d, a, b >> 8); devw8(d, a + 1, b); }
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static Uint16 devr16(Device *d, Uint8 a) { return (devr8(d, a) << 8) + devr8(d, a + 1); }
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static void warp16(Uxn *u, Uint16 a){ u->ram.ptr = a; }
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static void pull16(Uxn *u){ push16(u->src, peek16(u->ram.dat, u->ram.ptr++)); u->ram.ptr++; }
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#define PUSH8(s, v) { if(s->ptr == 0xff) { errcode = 2; goto err; } s->dat[s->ptr++] = (v); }
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#define PUSH16(s, v) { if((tmp = s->ptr) >= 0xfe) { errcode = 2; goto err; } s->dat[tmp] = (v) >> 8; s->dat[tmp + 1] = (v); s->ptr = tmp + 2; }
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#define PUSH(s, v) { if(bs) { PUSH16(s, (v)) } else { PUSH8(s, (v)) } }
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#define POP8(o) { if(*pptr == 0) { errcode = 1; goto err; } o = (Uint16)src->dat[--(*pptr)]; }
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#define POP16(o) { if((tmp = *pptr) <= 1) { errcode = 1; goto err; } o = src->dat[tmp - 1]; o += src->dat[tmp - 2] << 8; *pptr = tmp - 2; }
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#define POP(o) { if(bs) { POP16(o) } else { POP8(o) } }
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#define POKE(x, y) { if(bs) { u->ram.dat[(x)] = (y) >> 8; u->ram.dat[(x) + 1] = (y); } else { u->ram.dat[(x)] = y; }}
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#define PEEK16(o, x) { o = (u->ram.dat[(x)] << 8) + u->ram.dat[(x) + 1]; }
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#define PEEK(o, x) { if(bs) { PEEK16(o, x) } else { o = u->ram.dat[(x)]; }}
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#define DEVR(o, d, v) { dev = (d); o = dev->dei(dev, (v) & 0x0f); if(bs) { o = (o << 8) + dev->dei(dev, ((v) + 1) & 0x0f); } }
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#define DEVW8(x, y) { dev->dat[(x) & 0xf] = y; dev->deo(dev, (x) & 0x0f); }
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#define DEVW(d, x, y) { dev = (d); if(bs) { DEVW8((x), (y) >> 8); DEVW8((x) + 1, (y)); } else { DEVW8((x), (y)) } }
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#define WARP(x) { if(bs) u->ram.ptr = (x); else u->ram.ptr += (Sint8)(x); }
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#pragma mark - Core
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void poke16(Uint8 *m, Uint16 a, Uint16 b) { m[a] = b >> 8; m[a + 1] = b; }
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Uint16 peek16(Uint8 *m, Uint16 a) { Uint16 r = m[a] << 8; return r + m[a + 1]; }
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int
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uxn_eval(Uxn *u, Uint16 vec)
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{
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Uint8 instr;
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Uint16 a,b,c;
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Uint8 instr, errcode, kptr, *pptr;
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Uint16 a,b,c, discard;
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int bs, tmp;
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Device *dev;
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if(!vec || u->dev[0].dat[0xf])
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return 0;
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u->ram.ptr = vec;
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if(u->wst.ptr > 0xf8) u->wst.ptr = 0xf8;
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while((instr = u->ram.dat[u->ram.ptr++])) {
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Stack *src, *dst;
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/* Return Mode */
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if(instr & MODE_RETURN) {
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u->src = &u->rst;
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u->dst = &u->wst;
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if(instr & 0x40) {
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src = &u->rst; dst = &u->wst;
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} else {
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u->src = &u->wst;
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u->dst = &u->rst;
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src = &u->wst; dst = &u->rst;
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}
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/* Keep Mode */
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if(instr & MODE_KEEP) {
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uxn_pop8 = pop8k;
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u->src->kptr = u->src->ptr;
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if(instr & 0x80) {
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kptr = src->ptr;
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pptr = &kptr;
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} else {
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uxn_pop8 = pop8d;
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pptr = &src->ptr;
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}
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/* Short Mode */
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if(instr & MODE_SHORT) {
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uxn_push = push16; uxn_pop = pop16;
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uxn_poke = poke16; uxn_peek = peek16;
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uxn_devw = devw16; uxn_devr = devr16;
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uxn_warp = warp16; uxn_pull = pull16;
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} else {
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uxn_push = push8; uxn_pop = uxn_pop8;
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uxn_poke = poke8; uxn_peek = peek8;
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uxn_devw = devw8; uxn_devr = devr8;
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uxn_warp = warp8; uxn_pull = pull8;
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}
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bs = instr & 0x20 ? 1 : 0;
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switch(instr & 0x1f){
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/* Stack */
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case 0x00: /* LIT */ uxn_pull(u); break;
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case 0x01: /* INC */ a = uxn_pop(u->src); uxn_push(u->src, a + 1); break;
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case 0x02: /* POP */ uxn_pop(u->src); break;
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case 0x03: /* DUP */ a = uxn_pop(u->src); uxn_push(u->src, a); uxn_push(u->src, a); break;
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case 0x04: /* NIP */ a = uxn_pop(u->src); uxn_pop(u->src); uxn_push(u->src, a); break;
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case 0x05: /* SWP */ a = uxn_pop(u->src), b = uxn_pop(u->src); uxn_push(u->src, a); uxn_push(u->src, b); break;
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case 0x06: /* OVR */ a = uxn_pop(u->src), b = uxn_pop(u->src); uxn_push(u->src, b); uxn_push(u->src, a); uxn_push(u->src, b); break;
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case 0x07: /* ROT */ a = uxn_pop(u->src), b = uxn_pop(u->src), c = uxn_pop(u->src); uxn_push(u->src, b); uxn_push(u->src, a); uxn_push(u->src, c); break;
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case 0x00: /* LIT */ if(bs) { PEEK16(a, u->ram.ptr); PUSH16(src, a); u->ram.ptr += 2; }
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else { a = u->ram.dat[u->ram.ptr++]; PUSH8(src, a); } break;
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case 0x01: /* INC */ POP(a); PUSH(src, a + 1); break;
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case 0x02: /* POP */ POP(discard); break;
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case 0x03: /* DUP */ POP(a); PUSH(src, a); PUSH(src, a); break;
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case 0x04: /* NIP */ POP(a); POP(discard); PUSH(src, a); break;
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case 0x05: /* SWP */ POP(a); POP(b); PUSH(src, a); PUSH(src, b); break;
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case 0x06: /* OVR */ POP(a); POP(b); PUSH(src, b); PUSH(src, a); PUSH(src, b); break;
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case 0x07: /* ROT */ POP(a); POP(b); POP(c); PUSH(src, b); PUSH(src, a); PUSH(src, c); break;
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/* Logic */
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case 0x08: /* EQU */ a = uxn_pop(u->src), b = uxn_pop(u->src); push8(u->src, b == a); break;
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case 0x09: /* NEQ */ a = uxn_pop(u->src), b = uxn_pop(u->src); push8(u->src, b != a); break;
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case 0x0a: /* GTH */ a = uxn_pop(u->src), b = uxn_pop(u->src); push8(u->src, b > a); break;
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case 0x0b: /* LTH */ a = uxn_pop(u->src), b = uxn_pop(u->src); push8(u->src, b < a); break;
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case 0x0c: /* JMP */ a = uxn_pop(u->src); uxn_warp(u, a); break;
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case 0x0d: /* JCN */ a = uxn_pop(u->src); if(uxn_pop8(u->src)) uxn_warp(u, a); break;
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case 0x0e: /* JSR */ a = uxn_pop(u->src); push16(u->dst, u->ram.ptr); uxn_warp(u, a); break;
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case 0x0f: /* STH */ a = uxn_pop(u->src); uxn_push(u->dst, a); break;
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case 0x08: /* EQU */ POP(a); POP(b); PUSH8(src, b == a); break;
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case 0x09: /* NEQ */ POP(a); POP(b); PUSH8(src, b != a); break;
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case 0x0a: /* GTH */ POP(a); POP(b); PUSH8(src, b > a); break;
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case 0x0b: /* LTH */ POP(a); POP(b); PUSH8(src, b < a); break;
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case 0x0c: /* JMP */ POP(a); WARP(a); break;
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case 0x0d: /* JCN */ POP(a); POP8(b); if(b) WARP(a); break;
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case 0x0e: /* JSR */ POP(a); PUSH16(dst, u->ram.ptr); WARP(a); break;
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case 0x0f: /* STH */ POP(a); PUSH(dst, a); break;
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/* Memory */
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case 0x10: /* LDZ */ a = uxn_pop8(u->src); uxn_push(u->src, uxn_peek(u->ram.dat, a)); break;
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case 0x11: /* STZ */ a = uxn_pop8(u->src); b = uxn_pop(u->src); uxn_poke(u->ram.dat, a, b); break;
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case 0x12: /* LDR */ a = uxn_pop8(u->src); uxn_push(u->src, uxn_peek(u->ram.dat, u->ram.ptr + (Sint8)a)); break;
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case 0x13: /* STR */ a = uxn_pop8(u->src); b = uxn_pop(u->src); uxn_poke(u->ram.dat, u->ram.ptr + (Sint8)a, b); break;
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case 0x14: /* LDA */ a = pop16(u->src); uxn_push(u->src, uxn_peek(u->ram.dat, a)); break;
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case 0x15: /* STA */ a = pop16(u->src); b = uxn_pop(u->src); uxn_poke(u->ram.dat, a, b); break;
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case 0x16: /* DEI */ a = uxn_pop8(u->src); uxn_push(u->src, uxn_devr(&u->dev[a >> 4], a)); break;
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case 0x17: /* DEO */ a = uxn_pop8(u->src); b = uxn_pop(u->src); uxn_devw(&u->dev[a >> 4], a, b); break;
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case 0x10: /* LDZ */ POP8(a); PEEK(b, a); PUSH(src, b); break;
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case 0x11: /* STZ */ POP8(a); POP(b); POKE(a, b); break;
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case 0x12: /* LDR */ POP8(a); PEEK(b, u->ram.ptr + (Sint8)a); PUSH(src, b); break;
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case 0x13: /* STR */ POP8(a); POP(b); c = u->ram.ptr + (Sint8)a; POKE(c, b); break;
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case 0x14: /* LDA */ POP16(a); PEEK(b, a); PUSH(src, b); break;
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case 0x15: /* STA */ POP16(a); POP(b); POKE(a, b); break;
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case 0x16: /* DEI */ POP8(a); DEVR(b, &u->dev[a >> 4], a); PUSH(src, b); break;
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case 0x17: /* DEO */ POP8(a); POP(b); DEVW(&u->dev[a >> 4], a, b); break;
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/* Arithmetic */
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case 0x18: /* ADD */ a = uxn_pop(u->src), b = uxn_pop(u->src); uxn_push(u->src, b + a); break;
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case 0x19: /* SUB */ a = uxn_pop(u->src), b = uxn_pop(u->src); uxn_push(u->src, b - a); break;
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case 0x1a: /* MUL */ a = uxn_pop(u->src), b = uxn_pop(u->src); uxn_push(u->src, (Uint32)b * a); break;
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case 0x1b: /* DIV */ a = uxn_pop(u->src), b = uxn_pop(u->src); if(a == 0) { u->src->error = 3; a = 1; } uxn_push(u->src, b / a); break;
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case 0x1c: /* AND */ a = uxn_pop(u->src), b = uxn_pop(u->src); uxn_push(u->src, b & a); break;
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case 0x1d: /* ORA */ a = uxn_pop(u->src), b = uxn_pop(u->src); uxn_push(u->src, b | a); break;
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case 0x1e: /* EOR */ a = uxn_pop(u->src), b = uxn_pop(u->src); uxn_push(u->src, b ^ a); break;
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case 0x1f: /* SFT */ a = uxn_pop8(u->src), b = uxn_pop(u->src); uxn_push(u->src, b >> (a & 0x0f) << ((a & 0xf0) >> 4)); break;
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case 0x18: /* ADD */ POP(a); POP(b); PUSH(src, b + a); break;
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case 0x19: /* SUB */ POP(a); POP(b); PUSH(src, b - a); break;
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case 0x1a: /* MUL */ POP(a); POP(b); PUSH(src, (Uint32)b * a); break;
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case 0x1b: /* DIV */ POP(a); POP(b); if(a == 0) { errcode = 3; goto err; } PUSH(src, b / a); break;
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case 0x1c: /* AND */ POP(a); POP(b); PUSH(src, b & a); break;
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case 0x1d: /* ORA */ POP(a); POP(b); PUSH(src, b | a); break;
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case 0x1e: /* EOR */ POP(a); POP(b); PUSH(src, b ^ a); break;
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case 0x1f: /* SFT */ POP8(a); POP(b); c = b >> (a & 0x0f) << ((a & 0xf0) >> 4); PUSH(src, c); break;
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}
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if(u->wst.error) return uxn_halt(u, u->wst.error, "Working-stack", instr);
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if(u->rst.error) return uxn_halt(u, u->rst.error, "Return-stack", instr);
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}
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return 1;
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err:
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return uxn_halt(u, errcode, "Stack", instr);
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}
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/* clang-format on */
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