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Minor cleanup

This commit is contained in:
neauoire 2021-03-14 13:47:09 -07:00
parent 3280c2031b
commit 677515924a
2 changed files with 20 additions and 35 deletions
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53
assembler.c
View File

@ -256,12 +256,6 @@ int
walktoken(char *w)
{
Macro *m;
if((m = findmacro(w))) {
int i, res = 0;
for(i = 0; i < m->len; ++i)
res += walktoken(m->items[i]);
return res;
}
if(findopcode(w) || scmp(w, "BRK", 4))
return 1;
switch(w[0]) {
@ -274,6 +268,12 @@ walktoken(char *w)
case '-': /* signed negative */
case '#': return (slen(w + 1) == 2 ? 2 : 3);
}
if((m = findmacro(w))) {
int i, res = 0;
for(i = 0; i < m->len; ++i)
res += walktoken(m->items[i]);
return res;
}
return error("Unknown label in first pass", w);
}
@ -293,38 +293,32 @@ parsetoken(char *w)
pushbyte((Sint8)(l->addr - p.ptr - 3), 1);
l->refs++;
return 1;
}
if(w[0] == '=' && (l = findlabel(w + 1))) {
} else if(w[0] == '=' && (l = findlabel(w + 1))) {
if(!findlabellen(w + 1) || findlabellen(w + 1) > 2)
return error("Invalid load helper", w);
return error("Invalid store helper", w);
pushshort(findlabeladdr(w + 1), 1);
pushbyte(findopcode(findlabellen(w + 1) == 2 ? "STR2" : "STR"), 0);
l->refs++;
return 1;
}
if(w[0] == '~' && (l = findlabel(w + 1))) {
} else if(w[0] == '~' && (l = findlabel(w + 1))) {
if(!findlabellen(w + 1) || findlabellen(w + 1) > 2)
return error("Invalid load helper", w);
pushshort(findlabeladdr(w + 1), 1);
pushbyte(findopcode(findlabellen(w + 1) == 2 ? "LDR2" : "LDR"), 0);
l->refs++;
return 1;
}
if((op = findopcode(w)) || scmp(w, "BRK", 4)) {
} else if((op = findopcode(w)) || scmp(w, "BRK", 4)) {
pushbyte(op, 0);
return 1;
}
if(w[0] == '.' && (l = findlabel(w + 1))) {
} else if(w[0] == '.' && (l = findlabel(w + 1))) {
pushshort(findlabeladdr(w + 1), 0);
l->refs++;
return 1;
}
if(w[0] == ',' && (l = findlabel(w + 1))) {
} else if(w[0] == ',' && (l = findlabel(w + 1))) {
pushshort(findlabeladdr(w + 1), 1);
l->refs++;
return 1;
}
if(w[0] == '#' && sihx(w + 1)) {
} else if(w[0] == '#' && sihx(w + 1)) {
if(slen(w + 1) == 2)
pushbyte(shex(w + 1), 1);
else if(slen(w + 1) == 4)
@ -332,18 +326,14 @@ parsetoken(char *w)
else
return 0;
return 1;
}
if(w[0] == '+' && sihx(w + 1)) {
} else if(w[0] == '+' && sihx(w + 1)) {
if(slen(w + 1) == 2)
pushbyte((Sint8)shex(w + 1), 1);
else if(slen(w + 1) == 4)
pushshort((Sint16)shex(w + 1), 1);
else
return 0;
}
if(w[0] == '-' && sihx(w + 1)) {
} else if(w[0] == '-' && sihx(w + 1)) {
if(slen(w + 1) == 2)
pushbyte((Sint8)(shex(w + 1) * -1), 1);
else if(slen(w + 1) == 4)
@ -351,17 +341,13 @@ parsetoken(char *w)
else
return 0;
return 1;
}
if((m = findmacro(w))) {
int i, res = 0;
for(i = 0; i < m->len; ++i) {
} else if((m = findmacro(w))) {
int i;
for(i = 0; i < m->len; ++i)
if(!parsetoken(m->items[i]))
return 0;
}
return 1;
}
return 0;
}
@ -399,9 +385,8 @@ pass1(FILE *f)
if(shex(w + 1) < addr)
return error("Memory Overwrite", w);
addr = shex(w + 1);
} else {
} else
addr += walktoken(w);
}
}
rewind(f);
return 1;

2
build.sh
View File

@ -20,5 +20,5 @@ cc -std=c89 -DDEBUG -Wall -Wno-unknown-pragmas -Wpedantic -Wshadow -Wextra -Werr
# cc uxn.c emulator.c -std=c89 -Os -DNDEBUG -g0 -s -Wall -Wno-unknown-pragmas -L/usr/local/lib -lSDL2 -o bin/emulator
# run
./bin/assembler projects/software/left.usm bin/boot.rom
./bin/assembler projects/software/nasu.usm bin/boot.rom
./bin/emulator bin/boot.rom