mirror of https://git.sr.ht/~rabbits/uxn
Abstracted isopcode
This commit is contained in:
Devine Lu Linvega
parent
6fdc6e6791
commit
0c13a40916
85
src/uxnasm.c
85
src/uxnasm.c
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@ -90,16 +90,6 @@ setlocation(char *name)
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return name;
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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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if(slen(scope) + slen(name) >= 0x3f) {
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error_asm("Sublabel length too long", name);
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return NULL;
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}
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return scat(scat(scpy(scope, src, 0x40), "/"), name);
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}
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static Macro *
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findmacro(char *name)
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{
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@ -125,19 +115,20 @@ findopcode(char *s)
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{
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int i;
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for(i = 0; i < 0x20; i++) {
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int m = 0;
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int m = 3;
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if(!scmp(ops[i], s, 3))
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continue;
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if(!i) i |= (1 << 7); /* force keep for LIT */
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while(s[3 + m]) {
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if(s[3 + m] == '2')
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i |= (1 << 5); /* mode: short */
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else if(s[3 + m] == 'r')
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i |= (1 << 6); /* mode: return */
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else if(s[3 + m] == 'k')
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i |= (1 << 7); /* mode: keep */
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if(!i)
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i |= (1 << 7);
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while(s[m]) {
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if(s[m] == '2')
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i |= (1 << 5);
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else if(s[m] == 'r')
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i |= (1 << 6);
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else if(s[m] == 'k')
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i |= (1 << 7);
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else
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return 0; /* failed to match */
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return 0;
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m++;
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}
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return i;
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@ -145,6 +136,21 @@ findopcode(char *s)
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return 0;
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}
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static int
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isrune(char c)
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{
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char cc, *r = runes;
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while((cc = *r++))
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if(c == cc) return 1;
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return 0;
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}
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static int
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isopcode(char *s)
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{
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return findopcode(s) || scmp(s, "BRK", 4);
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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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@ -154,7 +160,7 @@ makemacro(char *name, FILE *f)
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return error_asm("Macro duplicate", name);
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if(sihx(name) && slen(name) % 2 == 0)
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return error_asm("Macro name is hex number", name);
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if(findopcode(name) || scmp(name, "BRK", 4) || !slen(name))
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if(isopcode(name) || !slen(name))
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return error_asm("Macro name is invalid", name);
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if(p.macro_len == 0x100)
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return error_asm("Macros limit exceeded", name);
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@ -172,15 +178,6 @@ makemacro(char *name, FILE *f)
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return 1;
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}
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static int
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isrune(char c)
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{
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char cc, *r = runes;
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while((cc = *r++))
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if(c == cc) return 1;
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return 0;
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}
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static int
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makelabel(char *name)
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{
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@ -189,7 +186,7 @@ makelabel(char *name)
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return error_asm("Label duplicate", name);
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if(sihx(name) && (slen(name) == 2 || slen(name) == 4))
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return error_asm("Label name is hex number", name);
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if(findopcode(name) || scmp(name, "BRK", 4) || !slen(name))
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if(isopcode(name) || !slen(name))
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return error_asm("Label name is invalid", name);
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if(isrune(name[0]))
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return error_asm("Label name is runic", name);
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@ -205,13 +202,23 @@ makelabel(char *name)
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static char *
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makelambda(int id)
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{
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p.lambda_name[0] = 0xce;
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p.lambda_name[1] = 0xbb;
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p.lambda_name[0] = (char)0xce;
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p.lambda_name[1] = (char)0xbb;
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p.lambda_name[2] = hexad[id >> 0x4];
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p.lambda_name[3] = hexad[id & 0xf];
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return p.lambda_name;
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}
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static char *
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makesublabel(char *src, char *scope, char *name)
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{
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if(slen(scope) + slen(name) >= 0x3f) {
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error_asm("Sublabel length too long", name);
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return NULL;
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}
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return scat(scat(scpy(scope, src, 0x40), "/"), name);
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}
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static int
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makereference(char *scope, char *label, char rune, Uint16 addr)
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{
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@ -224,7 +231,7 @@ makereference(char *scope, char *label, char rune, Uint16 addr)
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p.lambda_stack[p.lambda_ptr++] = p.lambda_len;
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scpy(makelambda(p.lambda_len++), r->name, 0x40);
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} else if(label[0] == '&' || label[0] == '/') {
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if(!sublabel(subw, scope, label + 1))
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if(!makesublabel(subw, scope, label + 1))
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return error_asm("Invalid sublabel", label);
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scpy(subw, r->name, 0x40);
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} else {
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@ -246,7 +253,7 @@ writebyte(Uint8 b)
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{
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if(p.ptr < TRIM)
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return error_asm("Writing in zero-page", "");
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else if(p.ptr > 0xffff)
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else if(p.ptr == 0xffff)
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return error_asm("Writing after the end of RAM", "");
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else if(p.ptr < p.length)
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return error_asm("Memory overwrite", "");
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@ -323,7 +330,7 @@ parse(char *w, FILE *f)
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if(sihx(w + 1))
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p.ptr = shex(w + 1);
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else if(w[1] == '&') {
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if(!sublabel(subw, p.scope, w + 2) || !(l = findlabel(subw)))
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if(!makesublabel(subw, p.scope, w + 2) || !(l = findlabel(subw)))
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return error_asm("Invalid sublabel", w);
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p.ptr = l->addr;
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} else {
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@ -336,7 +343,7 @@ parse(char *w, FILE *f)
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if(sihx(w + 1))
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p.ptr += shex(w + 1);
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else if(w[1] == '&') {
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if(!sublabel(subw, p.scope, w + 2) || !(l = findlabel(subw)))
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if(!makesublabel(subw, p.scope, w + 2) || !(l = findlabel(subw)))
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return error_asm("Invalid sublabel", w);
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p.ptr += l->addr;
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} else {
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@ -354,7 +361,7 @@ parse(char *w, FILE *f)
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p.scope[i] = '\0';
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break;
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case '&': /* sublabel */
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if(!sublabel(subw, p.scope, w + 1) || !makelabel(subw))
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if(!makesublabel(subw, p.scope, w + 1) || !makelabel(subw))
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return error_asm("Invalid sublabel", w);
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break;
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case '#': /* literals hex */
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@ -396,7 +403,7 @@ parse(char *w, FILE *f)
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if(slen(w) == 1) break; /* else fallthrough */
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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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if(isopcode(w))
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return writeopcode(w);
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/* raw byte */
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else if(sihx(w) && slen(w) == 2)
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