Basic implementation of structs
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neauoire
parent
fd71d97dfc
commit
15bb0ea9c5
97
assembler.c
97
assembler.c
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@ -22,14 +22,15 @@ typedef struct {
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} Program;
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typedef struct {
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char name[64], keys[16][64];
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Uint8 len, lens[16];
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char name[64], params[16][64];
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Uint8 len, length[16], size;
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} Macro;
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typedef struct {
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Uint8 len;
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Uint8 len, offset;
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Uint16 addr;
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char name[64];
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Macro *macro;
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} Label;
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int macroslen;
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@ -49,10 +50,11 @@ char ops[][4] = {
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"ADD", "SUB", "MUL", "DIV", "EQU", "NEQ", "GTH", "LTH"
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};
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int scmp(char *a, char *b) { int i = 0; while(a[i] == b[i]) if(!a[i++]) return 1; return 0; } /* string compare */
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int slen(char *s) { int i = 0; while(s[i] && s[++i]) ; return i; } /* string length */
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int sihx(char *s) { int i = 0; char c; while((c = s[i++])) if(!(c >= '0' && c <= '9') && !(c >= 'a' && c <= 'f') && !(c >= 'A' && c <= 'F')) return 0; return 1; } /* string is hexadecimal */
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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'); else if(c >= 'a' && c <= 'f') n = n * 16 + 10 + (c - 'a'); return n; } /* string to num */
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int scin(char *s, char c) { int i = 0; while(s[i]) if(s[i++] == c) return i - 1; return -1; } /* string char index */
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int scmp(char *a, char *b, int len) { int i = 0; while(a[i] == b[i] && i < len) if(!a[i++]) return 1; return 0; } /* string compare */
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int slen(char *s) { int i = 0; while(s[i] && s[++i]) ; return i; } /* string length */
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int sihx(char *s) { int i = 0; char c; while((c = s[i++])) if(!(c >= '0' && c <= '9') && !(c >= 'a' && c <= 'f') && !(c >= 'A' && c <= 'F')) return 0; return 1; } /* string is hexadecimal */
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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'); else if(c >= 'a' && c <= 'f') n = n * 16 + 10 + (c - 'a'); return n; } /* string to num */
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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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#pragma mark - Helpers
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@ -83,21 +85,53 @@ findmacro(char *s)
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{
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int i;
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for(i = 0; i < macroslen; ++i)
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if(scmp(macros[i].name, s))
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if(scmp(macros[i].name, s, 64))
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return ¯os[i];
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return NULL;
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}
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Label *
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findlabel(char *s)
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findlabelplain(char *s)
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{
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int i;
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for(i = 0; i < labelslen; ++i)
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if(scmp(labels[i].name, s))
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if(scmp(labels[i].name, s, 64))
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return &labels[i];
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return NULL;
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}
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Label *
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findlabelmacro(char *s)
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{
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int i, o = 0, pti = scin(s, '.');
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char name[64], param[64];
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Label *l;
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if(pti > 0) {
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scpy(s, name, pti + 1);
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scpy(s + pti + 1, param, 64);
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} else
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scpy(s, name, 64);
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if(!(l = findlabelplain(name)) || !l->macro)
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return NULL;
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/* find macro offset */
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for(i = 0; i < l->macro->len; ++i) {
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if(scmp(l->macro->params[i], param, 64)) {
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l->offset = o;
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break;
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}
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o += l->macro->length[i];
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}
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return l;
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}
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Label *
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findlabel(char *s)
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{
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if(scin(s, '.') > 0)
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return findlabelmacro(s);
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return findlabelplain(s);
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}
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Uint8
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findopcode(char *s)
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{
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@ -140,25 +174,27 @@ makemacro(char *name, FILE *f)
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if(findopcode(name))
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return error("Macro name is invalid", name);
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m = ¯os[macroslen++];
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scpy(name, m->name, 64);
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while(fscanf(f, "%s", wv)) {
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if(wv[0] == '{')
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continue;
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if(wv[0] == '}')
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break;
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if(mode == 0)
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scpy(wv, m->keys[m->len], 64);
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scpy(wv, m->params[m->len], 64);
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else {
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m->lens[m->len] = shex(wv);
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m->length[m->len] = shex(wv);
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m->size += m->length[m->len];
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m->len++;
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}
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mode = !mode;
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}
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printf("New macro: %s[%d items]\n", name, m->len);
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printf("New macro: %s[%d:%d]\n", name, m->len, m->size);
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return 1;
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}
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int
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makelabel(char *name, Uint16 addr, Uint8 len)
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makelabel(char *name, Uint16 addr, Uint8 len, Macro *m)
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{
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Label *l;
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if(findlabel(name))
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@ -171,6 +207,8 @@ makelabel(char *name, Uint16 addr, Uint8 len)
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l->addr = addr;
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l->len = len;
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scpy(name, l->name, 64);
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if(m)
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l->macro = m;
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printf("New label: %s, at 0x%02x[%d]\n", l->name, l->addr, l->len);
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return 1;
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}
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@ -180,18 +218,23 @@ makeconst(char *id, FILE *f)
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{
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char wv[64];
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fscanf(f, "%s", wv);
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return makelabel(id, shex(wv), 1);
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return makelabel(id, shex(wv), 1, 0);
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}
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int
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makevariable(char *id, Uint16 *addr, FILE *f)
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{
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char wv[64];
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Uint8 origin;
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Uint8 origin, len;
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Macro *m = NULL;
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fscanf(f, "%s", wv);
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origin = *addr;
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*addr += shex(wv);
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return makelabel(id, origin, shex(wv));
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if((m = findmacro(wv)))
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len = m->size;
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else
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len = shex(wv);
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*addr += len;
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return makelabel(id, origin, len, m);
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}
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int
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@ -247,13 +290,14 @@ pass1(FILE *f)
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int ccmnt = 0, cstrg = 0, cbits = 0;
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Uint16 addr = 0;
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char w[64];
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printf("Pass 1\n");
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while(fscanf(f, "%s", w) == 1) {
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if(skipblock(w, &ccmnt, '(', ')')) continue;
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if(skipstring(w, &cstrg, &addr)) continue;
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if(skipblock(w, &cbits, '[', ']'))
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addr += w[0] != '[' && w[0] != ']' ? 2 : 0;
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else if(w[0] == '@') {
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if(!makelabel(w + 1, addr, 0))
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if(!makelabel(w + 1, addr, 0, NULL))
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return error("Pass1 failed", w);
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} else if(w[0] == ';') {
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if(!makevariable(w + 1, &addr, f))
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@ -264,7 +308,7 @@ pass1(FILE *f)
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} else if(w[0] == ':') {
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if(!makeconst(w + 1, f))
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return error("Pass1 failed", w);
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} else if(findopcode(w) || scmp(w, "BRK"))
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} else if(findopcode(w) || scmp(w, "BRK", 4))
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addr += 1;
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else {
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switch(w[0]) {
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@ -289,6 +333,7 @@ pass2(FILE *f)
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{
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int ccmnt = 0, cstrg = 0, cbits = 0, cmacro = 0;
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char w[64];
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printf("Pass 2\n");
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while(fscanf(f, "%s", w) == 1) {
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Uint8 op = 0;
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Label *l;
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@ -300,7 +345,7 @@ pass2(FILE *f)
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/* clang-format off */
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if(skipblock(w, &cbits, '[', ']')) { if(w[0] != '[' && w[0] != ']') { pushshort(shex(w), 0); } }
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else if(w[0] == '|') p.ptr = shex(w + 1);
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else if((op = findopcode(w)) || scmp(w, "BRK")) pushbyte(op, 0);
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else if((op = findopcode(w)) || scmp(w, "BRK", 4)) pushbyte(op, 0);
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else if(w[0] == ':') fscanf(f, "%s", w);
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else if(w[0] == ';') fscanf(f, "%s", w);
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else if(w[0] == '.' && sihx(w + 1) && slen(w + 1) == 2) pushbyte(shex(w + 1), 0);
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@ -311,10 +356,12 @@ pass2(FILE *f)
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else if(w[0] == '+' && sihx(w + 1) && slen(w + 1) == 4) pushshort((Sint16)shex(w + 1), 1);
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else if(w[0] == '-' && sihx(w + 1) && slen(w + 1) == 2) pushbyte((Sint8)(shex(w + 1) * -1), 1);
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else if(w[0] == '-' && sihx(w + 1) && slen(w + 1) == 4) pushshort((Sint16)(shex(w + 1) * -1), 1);
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else if(w[0] == '=' && (l = findlabel(w + 1)) && l->len){ pushshort(l->addr, 1); pushbyte(findopcode(l->len == 2 ? "STR2" : "STR"),0); }
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else if(w[0] == '~' && (l = findlabel(w + 1)) && l->len){ pushshort(l->addr, 1); pushbyte(findopcode(l->len == 2 ? "LDR2" : "LDR"),0); }
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else if((l = findlabel(w + 1))) pushshort(l->addr, w[0] == ',');
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else return error("Unknown label in second pass", w);
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else if(w[0] == '=' && (l = findlabel(w + 1)) && l->len){ pushshort(l->addr + l->offset, 1); pushbyte(findopcode(l->len == 2 ? "STR2" : "STR"),0); }
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else if(w[0] == '~' && (l = findlabel(w + 1)) && l->len){ pushshort(l->addr + l->offset, 1); pushbyte(findopcode(l->len == 2 ? "LDR2" : "LDR"),0); }
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else if((l = findlabel(w + 1))) pushshort(l->addr + l->offset, w[0] == ',');
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else {
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return error("Unknown label in second pass", w);
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}
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/* clang-format on */
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}
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return 1;
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@ -3,28 +3,22 @@
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:dev/r fff8 ( std read port )
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:dev/w fff9 ( std write port )
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&point2d { x 2 y 2 }
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&point3d { x 2 y 2 z 2 }
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&Rect2d { x 2 y 2 width 2 height 2 }
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;position point2d
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;vertex point3d
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;rc1 Rect2d
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( TODO )
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|0100 @RESET
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,position:x #0002 STR2
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~position:x
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#02 =position:x
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#abcd =vertex:x
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#abcd ,rc1.height STR2
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,rc1.height LDR2
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,rc1.height LDR2
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BRK
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|c000 @FRAME BRK
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|d000 @ERROR BRK
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|FFF0 [ f2ac 35bb 2b53 ] ( palette )
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|FFF0 [ 0f32 0f32 0f32 ] ( palette )
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|FFFA .RESET .FRAME .ERROR
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