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(uxnasm) Merged ref resolution functions

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This commit is contained in:
Devine Lu Linvega 2024-03-27 17:08:32 -07:00
parent a252da617c
commit 5801d4fc9f
1 changed files with 51 additions and 59 deletions
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110
src/uxnasm.c
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@ -30,7 +30,7 @@ typedef struct {
static int ptr, length;
static char token[0x40], scope[0x40], sublabel[0x80], lambda[0x05];
static char dict[0x10000], *dictnext = dict;
static Uint8 data[0x10000], lambda_stack[0x100], lambda_ptr, lambda_len;
static Uint8 rom[0x10000], lambda_stack[0x100], lambda_ptr, lambda_len;
static Uint16 label_len, refs_len, macro_len;
static Item labels[0x400], refs[0x1000], macros[0x100];
@ -209,22 +209,6 @@ makelambda(int id)
return lambda;
}
static int
makepad(char *w)
{
Item *l;
int rel = w[0] == '$' ? ptr : 0;
if(sihx(w + 1)) {
ptr = shex(w + 1) + rel;
return 1;
}
if((l = findlabel(w + 1))) {
ptr = l->addr + rel;
return 1;
}
return 0;
}
static int
addref(char *label, char rune, Uint16 addr)
{
@ -244,6 +228,22 @@ addref(char *label, char rune, Uint16 addr)
return 1;
}
static int
writepad(char *w)
{
Item *l;
int rel = w[0] == '$' ? ptr : 0;
if(sihx(w + 1)) {
ptr = shex(w + 1) + rel;
return 1;
}
if((l = findlabel(w + 1))) {
ptr = l->addr + rel;
return 1;
}
return 0;
}
static int
writebyte(Uint8 b, Context *ctx)
{
@ -253,7 +253,7 @@ writebyte(Uint8 b, Context *ctx)
return error_asm("Writing outside memory");
else if(ptr < length)
return error_asm("Writing rewind");
data[ptr++] = b;
rom[ptr++] = b;
length = ptr;
return 1;
}
@ -300,6 +300,9 @@ parse(char *w, FILE *f, Context *ctx)
{
Item *m;
switch(w[0]) {
case '$':
case '|': return !writepad(w) ? error_asm("Invalid padding") : 1;
case '"': return !writestring(w + 1, ctx) ? error_asm("Invalid string") : 1;
case '(': return !walkcomment(f, ctx) ? error_asm("Invalid comment") : 1;
case '~': return !makeinclude(w + 1) ? error_asm("Invalid include") : 1;
case '%': return !makemacro(w + 1, f, ctx) ? error_asm("Invalid macro") : 1;
@ -316,9 +319,6 @@ parse(char *w, FILE *f, Context *ctx)
case ';': return addref(w + 1, w[0], ptr + 1) && writebyte(findopcode("LIT2"), ctx) && writeshort(0xffff);
case '?': return addref(w + 1, w[0], ptr + 1) && writebyte(0x20, ctx) && writeshort(0xffff);
case '!': return addref(w + 1, w[0], ptr + 1) && writebyte(0x40, ctx) && writeshort(0xffff);
case '"': return !writestring(w + 1, ctx) ? error_asm("Invalid string") : 1;
case '$':
case '|': return !makepad(w) ? error_asm("Invalid padding") : 1;
case '[':
case ']': return 1;
}
@ -331,47 +331,39 @@ parse(char *w, FILE *f, Context *ctx)
return addref(w, ' ', ptr + 1) && writebyte(0x60, ctx) && writeshort(0xffff);
}
static int
writeref(Item *r)
{
int rel;
Uint8 *rom = data + r->addr;
Item *l = findlabel(r->name);
if(!l) return 0;
switch(r->rune) {
case '_':
case ',':
*rom = rel = l->addr - r->addr - 2;
if((Sint8)data[r->addr] != rel)
return error_top("Relative reference is too far", r->name);
break;
case '-':
case '.':
*rom = l->addr;
break;
case ':':
case '=':
case ';':
*rom++ = l->addr >> 8, *rom = l->addr;
break;
case '?':
case '!':
default:
rel = l->addr - r->addr - 2;
*rom++ = rel >> 8, *rom = rel;
break;
}
l->refs++;
return 1;
}
static int
resolve(void)
{
int i;
int i, rel;
for(i = 0; i < refs_len; i++) {
Item *r = &refs[i];
if(!writeref(r)) return error_top("Unknown reference", r->name);
Item *r = &refs[i], *l = findlabel(r->name);
Uint8 *rom = rom + r->addr;
if(!l)
return error_top("Unknown reference", r->name);
switch(r->rune) {
case '_':
case ',':
*rom = rel = l->addr - r->addr - 2;
if((Sint8)rom[r->addr] != rel)
return error_top("Relative reference is too far", r->name);
break;
case '-':
case '.':
*rom = l->addr;
break;
case ':':
case '=':
case ';':
*rom++ = l->addr >> 8, *rom = l->addr;
break;
case '?':
case '!':
default:
rel = l->addr - r->addr - 2;
*rom++ = rel >> 8, *rom = rel;
break;
}
l->refs++;
}
return 1;
}
@ -424,7 +416,7 @@ main(int argc, char *argv[])
if(!(dst = fopen(argv[2], "wb"))) return !error_top("Invalid Output", argv[2]);
if(length <= PAGE) return !error_top("Assembly", "Output rom is empty.");
review(argv[2]);
fwrite(data + PAGE, length - PAGE, 1, dst);
fwrite(rom + PAGE, length - PAGE, 1, dst);
writesym(argv[2]);
return 0;
}