mirror of https://git.sr.ht/~rabbits/uxn
(uxnasm) Rewrite
This commit is contained in:
neauoire
parent
b873f04789
commit
71e8177657
427
src/uxnasm.c
427
src/uxnasm.c
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@ -14,6 +14,7 @@ WITH REGARD TO THIS SOFTWARE.
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#define TRIM 0x0100
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#define LENGTH 0x10000
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#define REFERENCES 2048
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#define LABELS 512
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#define MACROS 256
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@ -31,15 +32,21 @@ typedef struct {
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Uint16 addr, refs;
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} Label;
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typedef struct {
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char name[64], rune;
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Uint16 addr;
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} Reference;
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typedef struct {
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Uint8 data[LENGTH];
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Uint16 ptr, length, llen, mlen;
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Uint16 ptr, length, llen, mlen, rlen;
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Label labels[LABELS];
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Macro macros[MACROS];
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Reference refs[REFERENCES];
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char scope[64];
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} Program;
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Program p;
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static Uint16 addr = 0;
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/* clang-format off */
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@ -50,7 +57,6 @@ static char ops[][4] = {
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"ADD", "SUB", "MUL", "DIV", "AND", "ORA", "EOR", "SFT"
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};
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static int cpos(char *s, char a){ int i = 0; char c; while((c = s[i++])) if(c == a) return i; return -1; }
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static int scmp(char *a, char *b, int len) { int i = 0; while(a[i] == b[i]) if(!a[i] || ++i >= len) return 1; return 0; } /* string compare */
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static int sihx(char *s) { int i = 0; char c; while((c = s[i++])) if(!(c >= '0' && c <= '9') && !(c >= 'a' && c <= 'f')) return 0; return i > 1; } /* string is hexadecimal */
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static int shex(char *s) { int n = 0, i = 0; char c; while((c = s[i++])) if(c >= '0' && c <= '9') n = n * 16 + (c - '0'); else if(c >= 'a' && c <= 'f') n = n * 16 + 10 + (c - 'a'); return n; } /* string to num */
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@ -58,11 +64,16 @@ static int slen(char *s) { int i = 0; while(s[i]) ++i; return i; } /* string l
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static char *scpy(char *src, char *dst, int len) { int i = 0; while((dst[i] = src[i]) && i < len - 2) i++; dst[i + 1] = '\0'; return dst; } /* string copy */
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static char *scat(char *dst, const char *src) { char *ptr = dst + slen(dst); while(*src) *ptr++ = *src++; *ptr = '\0'; return dst; } /* string cat */
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#pragma mark - Helpers
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/* clang-format on */
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#pragma mark - I/O
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static int tokenize(char *w, FILE *f);
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static int
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error(const char *name, const char *msg)
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{
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fprintf(stderr, "%s: %s\n", name, msg);
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return 0;
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}
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static Macro *
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findmacro(char *name)
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@ -109,45 +120,6 @@ findopcode(char *s)
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return 0;
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}
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static void
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pushbyte(Uint8 b, int lit)
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{
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if(lit) pushbyte(findopcode("LIT"), 0);
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p.data[p.ptr++] = b;
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p.length = p.ptr;
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}
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static void
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pushshort(Uint16 s, int lit)
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{
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if(lit) pushbyte(findopcode("LIT2"), 0);
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pushbyte((s >> 8) & 0xff, 0);
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pushbyte(s & 0xff, 0);
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}
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static void
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pushword(char *s)
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{
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int i = 0;
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char c;
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while((c = s[i++])) pushbyte(c, 0);
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}
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static char *
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sublabel(char *src, char *scope, char *name)
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{
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return scat(scat(scpy(scope, src, 64), "/"), name);
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}
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#pragma mark - Parser
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static int
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error(const char *name, const char *msg)
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{
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fprintf(stderr, "%s: %s\n", name, msg);
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return 0;
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}
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static int
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makemacro(char *name, FILE *f)
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{
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@ -186,216 +158,199 @@ makelabel(char *name)
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if(p.llen == LABELS)
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return error("Too many labels", name);
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l = &p.labels[p.llen++];
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l->addr = addr;
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l->addr = p.ptr;
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l->refs = 0;
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scpy(name, l->name, 64);
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return 1;
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}
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static int
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addref(Label *l, Uint8 rel)
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{
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if(rel) {
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int pos = cpos(l->name, '/');
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if(pos != -1) {
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char parent[64];
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Label *rl = findlabel(scpy(l->name, parent, pos));
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if(rl)
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++rl->refs;
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}
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}
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return ++l->refs;
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}
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static int
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skipblock(char *w, int *cap, char a, char b)
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{
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if(w[0] == b) {
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*cap = 0;
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return 1;
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}
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if(w[0] == a) *cap = 1;
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if(*cap) return 1;
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return 0;
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}
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static int
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walktoken(char *w)
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{
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Macro *m;
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if(findopcode(w) || scmp(w, "BRK", 4))
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return 1;
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switch(w[0]) {
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case '[': return 0;
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case ']': return 0;
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case '\'': return 1;
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case '.': return 2; /* zero-page: LIT addr-lb */
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case ',': return 2; /* relative: LIT addr-rel */
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case ':': return 2; /* absolute: addr-hb addr-lb */
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case ';': return 3; /* absolute: LIT addr-hb addr-lb */
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case '$': return shex(w + 1);
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case '#': return slen(w + 1) == 4 ? 3 : 2;
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case '"': return slen(w + 1);
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}
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if((m = findmacro(w))) {
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int i, res = 0;
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for(i = 0; i < m->len; ++i)
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res += walktoken(m->items[i]);
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return res;
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}
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if(sihx(w) && slen(w) == 2)
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return 1;
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else if(sihx(w) && slen(w) == 4)
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return 2;
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return error("Invalid token", w);
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}
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static int
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parsetoken(char *w)
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{
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Label *l;
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Macro *m;
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if(w[0] == '.' && (l = findlabel(w + 1))) { /* zero-page */
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if(l->addr > 0xff)
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return error("Address is not in zero page", w);
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pushbyte(l->addr, 1);
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return addref(l, 1);
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} else if(w[0] == ',' && (l = findlabel(w + 1))) { /* relative */
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int off = l->addr - p.ptr - 3;
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if(off < -126 || off > 126)
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return error("Address is too far", w);
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pushbyte((Sint8)off, 1);
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return addref(l, 0);
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} else if(w[0] == ':' && (l = findlabel(w + 1))) { /* raw */
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pushshort(l->addr, 0);
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return addref(l, 1);
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} else if(w[0] == ';' && (l = findlabel(w + 1))) { /* absolute */
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pushshort(l->addr, 1);
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return addref(l, 1);
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} else if(findopcode(w) || scmp(w, "BRK", 4)) { /* opcode */
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pushbyte(findopcode(w), 0);
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return 1;
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} else if(w[0] == '"') { /* string */
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pushword(w + 1);
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return 1;
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} else if(w[0] == '\'') { /* char */
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pushbyte((Uint8)w[1], 0);
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return 1;
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} else if(w[0] == '#') { /* immediate */
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if(sihx(w + 1) && slen(w + 1) == 2)
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pushbyte(shex(w + 1), 1);
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else if(sihx(w + 1) && slen(w + 1) == 4)
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pushshort(shex(w + 1), 1);
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else
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return error("Invalid hexadecimal literal", w);
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return 1;
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} else if(sihx(w)) { /* raw */
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if(slen(w) == 2)
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pushbyte(shex(w), 0);
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else if(slen(w) == 4)
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pushshort(shex(w), 0);
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else
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return error("Invalid hexadecimal value", w);
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return 1;
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} else if((m = findmacro(w))) {
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int i;
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for(i = 0; i < m->len; ++i)
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if(!parsetoken(m->items[i]))
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return error("Invalid macro", m->name);
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return 1;
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}
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return error("Invalid token", w);
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}
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static int
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doinclude(const char *filename, int (*pass)(FILE *))
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doinclude(const char *filename)
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{
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FILE *f;
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int ret;
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char w[64];
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if(!(f = fopen(filename, "r")))
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return error("Include failed to open", filename);
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ret = pass(f);
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while(fscanf(f, "%63s", w) == 1)
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if(!tokenize(w, f))
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return error("Unknown token", w);
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fclose(f);
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return ret;
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return 1;
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}
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static void
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writebyte(Uint8 b, int lit)
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{
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if(lit) writebyte(findopcode("LIT"), 0);
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p.data[p.ptr++] = b;
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p.length = p.ptr;
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}
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static void
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writeshort(Uint16 s, int lit)
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{
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if(lit) writebyte(findopcode("LIT2"), 0);
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writebyte((s >> 8) & 0xff, 0);
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writebyte(s & 0xff, 0);
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}
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static char *
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sublabel(char *src, char *scope, char *name)
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{
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return scat(scat(scpy(scope, src, 64), "/"), name);
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}
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static void
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prefill(char *scope, char *label, Uint16 addr)
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{
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char subw[64];
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Reference *r = &p.refs[p.rlen++];
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if(label[1] == '&')
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scpy(sublabel(subw, scope, label + 2), r->name, 64);
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else
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scpy(label + 1, r->name, 64);
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r->rune = label[0];
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r->addr = addr;
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}
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static int
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pass1(FILE *f)
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tokenize(char *w, FILE *f)
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{
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int ccmnt = 0;
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char w[64], scope[64], subw[64];
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scope[0] = 0;
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while(fscanf(f, "%63s", w) == 1) {
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if(skipblock(w, &ccmnt, '(', ')')) continue;
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if(slen(w) >= 63)
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return error("Pass 1 - Invalid token", w);
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if(w[0] == '|') {
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if(!sihx(w + 1))
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return error("Pass 1 - Invalid padding", w);
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addr = shex(w + 1);
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} else if(w[0] == '%') {
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if(!makemacro(w + 1, f))
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return error("Pass 1 - Invalid macro", w);
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} else if(w[0] == '@') {
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if(!makelabel(w + 1))
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return error("Pass 1 - Invalid label", w);
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scpy(w + 1, scope, 64);
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} else if(w[0] == '&') {
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if(!makelabel(sublabel(subw, scope, w + 1)))
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return error("Pass 1 - Invalid sublabel", w);
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} else if(w[0] == '~') {
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if(!doinclude(w + 1, pass1))
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return 0;
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} else if(sihx(w))
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addr += slen(w) / 2;
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else
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addr += walktoken(w);
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char word[64];
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char subw[64];
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char c;
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Macro *m;
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int i = 0;
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if(slen(w) >= 63)
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return error("Invalid token", w);
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switch(w[0]) {
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case '(': /* comment */
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while(fscanf(f, "%63s", word) == 1)
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if(word[0] == ')') break;
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break;
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case '~': /* include */
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if(!doinclude(w + 1))
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return error("Invalid include", w);
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break;
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case '%': /* macro */
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if(!makemacro(w + 1, f))
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return error("Invalid macro", w);
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break;
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case '|': /* pad-absolute */
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if(!sihx(w + 1))
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return error("Invalid padding", w);
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p.ptr = shex(w + 1);
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break;
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case '$': /* pad-relative */
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if(!sihx(w + 1))
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return error("Invalid padding", w);
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p.ptr += shex(w + 1);
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break;
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case '@': /* label */
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if(!makelabel(w + 1))
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return error("Invalid label", w);
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scpy(w + 1, p.scope, 64);
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break;
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case '&': /* sublabel */
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if(!makelabel(sublabel(subw, p.scope, w + 1)))
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return error("Invalid sublabel", w);
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break;
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case '#': /* literals hex */
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if(!sihx(w + 1) || (slen(w) != 3 && slen(w) != 5))
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return error("Invalid hex literal", w);
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if(slen(w) == 3)
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writebyte(shex(w + 1), 1);
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else if(slen(w) == 5)
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writeshort(shex(w + 1), 1);
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break;
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case '.': /* literal byte zero-page */
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case ',': /* literal byte relative */
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prefill(p.scope, w, p.ptr);
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writebyte(0xff, 1);
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break;
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case ';': /* literal short absolute */
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prefill(p.scope, w, p.ptr);
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writeshort(0xffff, 1);
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break;
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case ':': /* raw short absolute */
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prefill(p.scope, w, p.ptr);
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writeshort(0xffff, 0);
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break;
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case '\'': /* raw char */
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writebyte((Uint8)w[1], 0);
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break;
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case '"': /* raw string */
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i = 0;
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while((c = w[++i]))
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writebyte(c, 0);
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break;
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case '[': break; /* ignored */
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case ']': break; /* ignored */
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default:
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/* opcode */
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if(findopcode(w) || scmp(w, "BRK", 4))
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writebyte(findopcode(w), 0);
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/* raw byte */
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else if(sihx(w) && slen(w) == 2)
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writebyte(shex(w), 0);
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/* raw short */
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else if(sihx(w) && slen(w) == 4)
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writeshort(shex(w), 0);
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/* macro */
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else if((m = findmacro(w))) {
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for(i = 0; i < m->len; ++i)
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if(!tokenize(m->items[i], f))
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return 0;
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return 1;
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} else
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return error("Unknown token", w);
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}
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rewind(f);
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return 1;
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}
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static int
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pass2(FILE *f)
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resolve(void)
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{
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int ccmnt = 0, cmacr = 0;
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char w[64], scope[64], subw[64];
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scope[0] = 0;
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while(fscanf(f, "%63s", w) == 1) {
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if(w[0] == '%') continue;
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if(w[0] == '&') continue;
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if(w[0] == '[') continue;
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if(w[0] == ']') continue;
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if(skipblock(w, &ccmnt, '(', ')')) continue;
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if(skipblock(w, &cmacr, '{', '}')) continue;
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if(w[0] == '|') {
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if(p.length && (Uint16)shex(w + 1) < p.ptr)
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return error("Pass 2 - Memory overwrite", w);
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p.ptr = shex(w + 1);
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continue;
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} else if(w[0] == '$') {
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if(p.length && (Uint16)(p.ptr + shex(w + 1)) < p.ptr)
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return error("Pass 2 - Memory overwrite", w);
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p.ptr += shex(w + 1);
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continue;
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} else if(w[0] == '@') {
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scpy(w + 1, scope, 64);
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continue;
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} else if(w[0] == '~') {
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if(!doinclude(w + 1, pass2))
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return 0;
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continue;
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Label *l;
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int i;
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for(i = 0; i < p.rlen; ++i) {
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Reference *r = &p.refs[i];
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switch(r->rune) {
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case '.':
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if(!(l = findlabel(r->name)))
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return error("Unknown zero-page reference", r->name);
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p.data[r->addr + 1] = l->addr & 0xff;
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l->refs++;
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break;
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case ',':
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if(!(l = findlabel(r->name)))
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return error("Unknown relative reference", r->name);
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p.data[r->addr + 1] = (Sint8)(l->addr - r->addr - 3);
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l->refs++;
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break;
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case ';':
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if(!(l = findlabel(r->name)))
|
||||
return error("Unknown absolute reference", r->name);
|
||||
p.data[r->addr + 1] = l->addr >> 0x8;
|
||||
p.data[r->addr + 2] = l->addr & 0xff;
|
||||
l->refs++;
|
||||
break;
|
||||
case ':':
|
||||
if(!(l = findlabel(r->name)))
|
||||
return error("Unknown absolute reference", r->name);
|
||||
p.data[r->addr + 0] = l->addr >> 0x8;
|
||||
p.data[r->addr + 1] = l->addr & 0xff;
|
||||
l->refs++;
|
||||
break;
|
||||
default:
|
||||
return error("Unknown reference", r->name);
|
||||
}
|
||||
if(w[1] == '&' && (w[0] == '.' || w[0] == ',' || w[0] == ';' || w[0] == ':'))
|
||||
scpy(sublabel(subw, scope, w + 2), w + 1, 64);
|
||||
if(!parsetoken(w))
|
||||
return error("Pass 2 - Unknown label", w);
|
||||
}
|
||||
return 1;
|
||||
}
|
||||
|
||||
static void
|
||||
cleanup(char *filename)
|
||||
review(char *filename)
|
||||
{
|
||||
int i;
|
||||
for(i = 0; i < p.llen; ++i)
|
||||
|
|
@ -406,6 +361,18 @@ cleanup(char *filename)
|
|||
fprintf(stderr, "Assembled %s in %d bytes(%.2f%% used), %d labels, %d macros.\n", filename, p.length - TRIM, p.length / 652.80, p.llen, p.mlen);
|
||||
}
|
||||
|
||||
static int
|
||||
assemble(FILE *f)
|
||||
{
|
||||
char w[64];
|
||||
scpy("on-reset", p.scope, 64);
|
||||
while(fscanf(f, "%63s", w) == 1)
|
||||
if(!tokenize(w, f))
|
||||
return error("Unknown token", w);
|
||||
resolve();
|
||||
return 1;
|
||||
}
|
||||
|
||||
int
|
||||
main(int argc, char *argv[])
|
||||
{
|
||||
|
|
@ -414,11 +381,11 @@ main(int argc, char *argv[])
|
|||
return !error("usage", "input.tal output.rom");
|
||||
if(!(src = fopen(argv[1], "r")))
|
||||
return !error("Invalid Input", argv[1]);
|
||||
if(!pass1(src) || !pass2(src))
|
||||
if(!assemble(src))
|
||||
return !error("Assembly", "Failed to assemble rom.");
|
||||
if(!(dst = fopen(argv[2], "wb")))
|
||||
return !error("Invalid Output", argv[2]);
|
||||
fwrite(p.data + TRIM, p.length - TRIM, 1, dst);
|
||||
cleanup(argv[2]);
|
||||
review(argv[2]);
|
||||
return 0;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue