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as6.c
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as6.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <ctype.h>
#define SYMTABSZ 8000
#define nil NULL
typedef int64_t word;
typedef uint64_t uword;
typedef int32_t hword;
#define WORD(l, r) (((l)&0777777) << 18 | ((r)&0777777))
#define LW(w) (((w) >> 18)&0777777)
#define RW(w) ((w)&0777777)
enum Valtype
{
Undef = 0,
Abs,
Op,
Io,
Asm,
};
enum Toktype
{
Unused = 0,
Eof,
Symbol,
Word,
Newline,
Space,
Not,
DQuote,
Mod,
And,
LParen,
RParen,
Times,
Plus,
Comma,
Cons,
Minus,
Period,
Div,
Colon,
Semi,
Less,
Equal,
Great,
At,
LBrack,
RBrack,
LBrace,
Or,
RBrace,
/* only used as character classes */
Digit,
Letter,
};
typedef struct Value Value;
struct Value
{
int type;
word value;
};
typedef struct Sym Sym;
struct Sym
{
char name[24];
Value v;
};
typedef struct Token Token;
struct Token
{
int type;
union {
word w;
Sym *s;
};
};
typedef struct Section Section;
struct Section
{
hword start;
hword size;
};
int chartab[] = {
Unused, Unused, Unused, Unused, Unused, Unused, Unused, Unused,
Unused, Unused, Newline, Unused, Unused, Unused, Unused, Unused,
Unused, Unused, Unused, Unused, Unused, Unused, Unused, Unused,
Unused, Unused, Unused, Unused, Unused, Unused, Unused, Unused,
Space, Not, DQuote, Unused, Unused, Mod, And, Unused,
LParen, RParen, Times, Plus, Comma, Minus, Period, Div,
Digit, Digit, Digit, Digit, Digit, Digit, Digit, Digit,
Digit, Digit, Colon, Semi, Less, Equal, Great, Unused,
At, Letter, Letter, Letter, Letter, Letter, Letter, Letter,
Letter, Letter, Letter, Letter, Letter, Letter, Letter, Letter,
Letter, Letter, Letter, Letter, Letter, Letter, Letter, Letter,
Letter, Letter, Letter, LBrack, Unused, RBrack, Unused, Letter,
Unused, Letter, Letter, Letter, Letter, Letter, Letter, Letter,
Letter, Letter, Letter, Letter, Letter, Letter, Letter, Letter,
Letter, Letter, Letter, Letter, Letter, Letter, Letter, Letter,
Letter, Letter, Letter, LBrace, Or, RBrace, Unused, Unused
};
#define CTYPE(c) chartab[(c)&0177]
Sym *symtab[SYMTABSZ];
Sym syms[] = {
{ ".", Abs, 0 },
{ "ASCII", Asm, 0 },
{ "FSC", Op, 0132 },
{ "IBP", Op, 0133 },
{ "ILDB", Op, 0134 },
{ "LDB", Op, 0135 },
{ "IDPB", Op, 0136 },
{ "DPB", Op, 0137 },
{ "FAD", Op, 0140 },
{ "FADL", Op, 0141 },
{ "FADM", Op, 0142 },
{ "FADB", Op, 0143 },
{ "FADR", Op, 0144 },
{ "FADRL", Op, 0145 },
{ "FADRM", Op, 0146 },
{ "FADRB", Op, 0147 },
{ "FSB", Op, 0150 },
{ "FSBL", Op, 0151 },
{ "FSBM", Op, 0152 },
{ "FSBB", Op, 0153 },
{ "FSBR", Op, 0154 },
{ "FSBRL", Op, 0155 },
{ "FSBRM", Op, 0156 },
{ "FSBRB", Op, 0157 },
{ "FMP", Op, 0160 },
{ "FMPL", Op, 0161 },
{ "FMPM", Op, 0162 },
{ "FMPB", Op, 0163 },
{ "FMPR", Op, 0164 },
{ "FMPRL", Op, 0165 },
{ "FMPRM", Op, 0166 },
{ "FMPRB", Op, 0167 },
{ "FDV", Op, 0170 },
{ "FDVL", Op, 0171 },
{ "FDVM", Op, 0172 },
{ "FDVB", Op, 0173 },
{ "FDVR", Op, 0174 },
{ "FDVRL", Op, 0175 },
{ "FDVRM", Op, 0176 },
{ "FDVRB", Op, 0177 },
{ "MOVE", Op, 0200 },
{ "MOVEI", Op, 0201 },
{ "MOVEM", Op, 0202 },
{ "MOVES", Op, 0203 },
{ "MOVS", Op, 0204 },
{ "MOVSI", Op, 0205 },
{ "MOVSM", Op, 0206 },
{ "MOVSS", Op, 0207 },
{ "MOVN", Op, 0210 },
{ "MOVNI", Op, 0211 },
{ "MOVNM", Op, 0212 },
{ "MOVNS", Op, 0213 },
{ "MOVM", Op, 0214 },
{ "MOVMI", Op, 0215 },
{ "MOVMM", Op, 0216 },
{ "MOVMS", Op, 0217 },
{ "IMUL", Op, 0220 },
{ "IMULI", Op, 0221 },
{ "IMULM", Op, 0222 },
{ "IMULB", Op, 0223 },
{ "MUL", Op, 0224 },
{ "MULI", Op, 0225 },
{ "MULM", Op, 0226 },
{ "MULB", Op, 0227 },
{ "IDIV", Op, 0230 },
{ "IDIVI", Op, 0231 },
{ "IDIVM", Op, 0232 },
{ "IDIVB", Op, 0233 },
{ "DIV", Op, 0234 },
{ "DIVI", Op, 0235 },
{ "DIVM", Op, 0236 },
{ "DIVB", Op, 0237 },
{ "ASH", Op, 0240 },
{ "ROT", Op, 0241 },
{ "LSH", Op, 0242 },
{ "ASHC", Op, 0244 },
{ "ROTC", Op, 0245 },
{ "LSHC", Op, 0246 },
{ "EXCH", Op, 0250 },
{ "BLT", Op, 0251 },
{ "AOBJP", Op, 0252 },
{ "AOBJN", Op, 0253 },
{ "JRST", Op, 0254 },
{ "JFCL", Op, 0255 },
{ "XCT", Op, 0256 },
{ "PUSHJ", Op, 0260 },
{ "PUSH", Op, 0261 },
{ "POP", Op, 0262 },
{ "POPJ", Op, 0263 },
{ "JSR", Op, 0264 },
{ "JSP", Op, 0265 },
{ "JSA", Op, 0266 },
{ "JRA", Op, 0267 },
{ "ADD", Op, 0270 },
{ "ADDI", Op, 0271 },
{ "ADDM", Op, 0272 },
{ "ADDB", Op, 0273 },
{ "SUB", Op, 0274 },
{ "SUBI", Op, 0275 },
{ "SUBM", Op, 0276 },
{ "SUBB", Op, 0277 },
{ "CAI", Op, 0300 },
{ "CAIL", Op, 0301 },
{ "CAIE", Op, 0302 },
{ "CAILE", Op, 0303 },
{ "CAIA", Op, 0304 },
{ "CAIGE", Op, 0305 },
{ "CAIN", Op, 0306 },
{ "CAIG", Op, 0307 },
{ "CAM", Op, 0310 },
{ "CAML", Op, 0311 },
{ "CAME", Op, 0312 },
{ "CAMLE", Op, 0313 },
{ "CAMA", Op, 0314 },
{ "CAMGE", Op, 0315 },
{ "CAMN", Op, 0316 },
{ "CAMG", Op, 0317 },
{ "JUMP", Op, 0320 },
{ "JUMPL", Op, 0321 },
{ "JUMPE", Op, 0322 },
{ "JUMPLE",Op, 0323 },
{ "JUMPA", Op, 0324 },
{ "JUMPGE",Op, 0325 },
{ "JUMPN", Op, 0326 },
{ "JUMPG", Op, 0327 },
{ "SKIP", Op, 0330 },
{ "SKIPL", Op, 0331 },
{ "SKIPE", Op, 0332 },
{ "SKIPLE",Op, 0333 },
{ "SKIPA", Op, 0334 },
{ "SKIPGE",Op, 0335 },
{ "SKIPN", Op, 0336 },
{ "SKIPG", Op, 0337 },
{ "AOJ", Op, 0340 },
{ "AOJL", Op, 0341 },
{ "AOJE", Op, 0342 },
{ "AOJLE", Op, 0343 },
{ "AOJA", Op, 0344 },
{ "AOJGE", Op, 0345 },
{ "AOJN", Op, 0346 },
{ "AOJG", Op, 0347 },
{ "AOS", Op, 0350 },
{ "AOSL", Op, 0351 },
{ "AOSE", Op, 0352 },
{ "AOSLE", Op, 0353 },
{ "AOSA", Op, 0354 },
{ "AOSGE", Op, 0355 },
{ "AOSN", Op, 0356 },
{ "AOSG", Op, 0357 },
{ "SOJ", Op, 0360 },
{ "SOJL", Op, 0361 },
{ "SOJE", Op, 0362 },
{ "SOJLE", Op, 0363 },
{ "SOJA", Op, 0364 },
{ "SOJGE", Op, 0365 },
{ "SOJN", Op, 0366 },
{ "SOJG", Op, 0367 },
{ "SOS", Op, 0370 },
{ "SOSL", Op, 0371 },
{ "SOSE", Op, 0372 },
{ "SOSLE", Op, 0373 },
{ "SOSA", Op, 0374 },
{ "SOSGE", Op, 0375 },
{ "SOSN", Op, 0376 },
{ "SOSG", Op, 0377 },
{ "SETZ", Op, 0400 },
{ "SETZI", Op, 0401 },
{ "SETZM", Op, 0402 },
{ "SETZB", Op, 0403 },
{ "AND", Op, 0404 },
{ "ANDI", Op, 0405 },
{ "ANDM", Op, 0406 },
{ "ANDB", Op, 0407 },
{ "ANDCA", Op, 0410 },
{ "ANDCAI",Op, 0411 },
{ "ANDCAM",Op, 0412 },
{ "ANDCAB",Op, 0413 },
{ "SETM", Op, 0414 },
{ "SETMI", Op, 0415 },
{ "SETMM", Op, 0416 },
{ "SETMB", Op, 0417 },
{ "ANDCM", Op, 0420 },
{ "ANDCMI",Op, 0421 },
{ "ANDCMM",Op, 0422 },
{ "ANDCMB",Op, 0423 },
{ "SETA", Op, 0424 },
{ "SETAI", Op, 0425 },
{ "SETAM", Op, 0426 },
{ "SETAB", Op, 0427 },
{ "XOR", Op, 0430 },
{ "XORI", Op, 0431 },
{ "XORM", Op, 0432 },
{ "XORB", Op, 0433 },
{ "IOR", Op, 0434 },
{ "IORI", Op, 0435 },
{ "IORM", Op, 0436 },
{ "IORB", Op, 0437 },
{ "ANDCB", Op, 0440 },
{ "ANDCBI",Op, 0441 },
{ "ANDCBM",Op, 0442 },
{ "ANDCBB",Op, 0443 },
{ "EQV", Op, 0444 },
{ "EQVI", Op, 0445 },
{ "EQVM", Op, 0446 },
{ "EQVB", Op, 0447 },
{ "SETCA", Op, 0450 },
{ "SETCAI",Op, 0451 },
{ "SETCAM",Op, 0452 },
{ "SETCAB",Op, 0453 },
{ "ORCA", Op, 0454 },
{ "ORCAI", Op, 0455 },
{ "ORCAM", Op, 0456 },
{ "ORCAB", Op, 0457 },
{ "SETCM", Op, 0460 },
{ "SETCMI",Op, 0461 },
{ "SETCMM",Op, 0462 },
{ "SETCMB",Op, 0463 },
{ "ORCM", Op, 0464 },
{ "ORCMI", Op, 0465 },
{ "ORCMM", Op, 0466 },
{ "ORCMB", Op, 0467 },
{ "ORCB", Op, 0470 },
{ "ORCBI", Op, 0471 },
{ "ORCBM", Op, 0472 },
{ "ORCBB", Op, 0473 },
{ "SETO", Op, 0474 },
{ "SETOI", Op, 0475 },
{ "SETOM", Op, 0476 },
{ "SETOB", Op, 0477 },
{ "HLL", Op, 0500 },
{ "HLLI", Op, 0501 },
{ "HLLM", Op, 0502 },
{ "HLLS", Op, 0503 },
{ "HRL", Op, 0504 },
{ "HRLI", Op, 0505 },
{ "HRLM", Op, 0506 },
{ "HRLS", Op, 0507 },
{ "HLLZ", Op, 0510 },
{ "HLLZI", Op, 0511 },
{ "HLLZM", Op, 0512 },
{ "HLLZS", Op, 0513 },
{ "HRLZ", Op, 0514 },
{ "HRLZI", Op, 0515 },
{ "HRLZM", Op, 0516 },
{ "HRLZS", Op, 0517 },
{ "HLLO", Op, 0520 },
{ "HLLOI", Op, 0521 },
{ "HLLOM", Op, 0522 },
{ "HLLOS", Op, 0523 },
{ "HRLO", Op, 0524 },
{ "HRLOI", Op, 0525 },
{ "HRLOM", Op, 0526 },
{ "HRLOS", Op, 0527 },
{ "HLLE", Op, 0530 },
{ "HLLEI", Op, 0531 },
{ "HLLEM", Op, 0532 },
{ "HLLES", Op, 0533 },
{ "HRLE", Op, 0534 },
{ "HRLEI", Op, 0535 },
{ "HRLEM", Op, 0536 },
{ "HRLES", Op, 0537 },
{ "HRR", Op, 0540 },
{ "HRRI", Op, 0541 },
{ "HRRM", Op, 0542 },
{ "HRRS", Op, 0543 },
{ "HLR", Op, 0544 },
{ "HLRI", Op, 0545 },
{ "HLRM", Op, 0546 },
{ "HLRS", Op, 0547 },
{ "HRRZ", Op, 0550 },
{ "HRRZI", Op, 0551 },
{ "HRRZM", Op, 0552 },
{ "HRRZS", Op, 0553 },
{ "HLRZ", Op, 0554 },
{ "HLRZI", Op, 0555 },
{ "HLRZM", Op, 0556 },
{ "HLRZS", Op, 0557 },
{ "HRRO", Op, 0560 },
{ "HRROI", Op, 0561 },
{ "HRROM", Op, 0562 },
{ "HRROS", Op, 0563 },
{ "HLRO", Op, 0564 },
{ "HLROI", Op, 0565 },
{ "HLROM", Op, 0566 },
{ "HLROS", Op, 0567 },
{ "HRRE", Op, 0570 },
{ "HRREI", Op, 0571 },
{ "HRREM", Op, 0572 },
{ "HRRES", Op, 0573 },
{ "HLRE", Op, 0574 },
{ "HLREI", Op, 0575 },
{ "HLREM", Op, 0576 },
{ "HLRES", Op, 0577 },
{ "TRN", Op, 0600 },
{ "TLN", Op, 0601 },
{ "TRNE", Op, 0602 },
{ "TLNE", Op, 0603 },
{ "TRNA", Op, 0604 },
{ "TLNA", Op, 0605 },
{ "TRNN", Op, 0606 },
{ "TLNN", Op, 0607 },
{ "TDN", Op, 0610 },
{ "TSN", Op, 0611 },
{ "TDNE", Op, 0612 },
{ "TSNE", Op, 0613 },
{ "TDNA", Op, 0614 },
{ "TSNA", Op, 0615 },
{ "TDNN", Op, 0616 },
{ "TSNN", Op, 0617 },
{ "TRZ", Op, 0620 },
{ "TLZ", Op, 0621 },
{ "TRZE", Op, 0622 },
{ "TLZE", Op, 0623 },
{ "TRZA", Op, 0624 },
{ "TLZA", Op, 0625 },
{ "TRZN", Op, 0626 },
{ "TLZN", Op, 0627 },
{ "TDZ", Op, 0630 },
{ "TSZ", Op, 0631 },
{ "TDZE", Op, 0632 },
{ "TSZE", Op, 0633 },
{ "TDZA", Op, 0634 },
{ "TSZA", Op, 0635 },
{ "TDZN", Op, 0636 },
{ "TSZN", Op, 0637 },
{ "TRC", Op, 0640 },
{ "TLC", Op, 0641 },
{ "TRCE", Op, 0642 },
{ "TLCE", Op, 0643 },
{ "TRCA", Op, 0644 },
{ "TLCA", Op, 0645 },
{ "TRCN", Op, 0646 },
{ "TLCN", Op, 0647 },
{ "TDC", Op, 0650 },
{ "TSC", Op, 0651 },
{ "TDCE", Op, 0652 },
{ "TSCE", Op, 0653 },
{ "TDCA", Op, 0654 },
{ "TSCA", Op, 0655 },
{ "TDCN", Op, 0656 },
{ "TSCN", Op, 0657 },
{ "TRO", Op, 0660 },
{ "TLO", Op, 0661 },
{ "TROE", Op, 0662 },
{ "TLOE", Op, 0663 },
{ "TROA", Op, 0664 },
{ "TLOA", Op, 0665 },
{ "TRON", Op, 0666 },
{ "TLON", Op, 0667 },
{ "TDO", Op, 0670 },
{ "TSO", Op, 0671 },
{ "TDOE", Op, 0672 },
{ "TSOE", Op, 0673 },
{ "TDOA", Op, 0674 },
{ "TSOA", Op, 0675 },
{ "TDON", Op, 0676 },
{ "TSON", Op, 0677 },
{ "BLKI", Io, 070000 },
{ "BLKO", Io, 070010 },
{ "DATAI", Io, 070004 },
{ "DATAO", Io, 070014 },
{ "CONO", Io, 070020 },
{ "CONI", Io, 070024 },
{ "CONSZ", Io, 070030 },
{ "CONSO", Io, 070034 },
{ "", 0, 0 }
};
hword assemble(void);
int pass2;
int error;
word origin;
word mem[01000000];
#define MAXSECT 100 /* increase if necessary */
Section sects[MAXSECT];
int nsect;
hword nextdot;
FILE *tokf;
FILE *wf;
FILE *outf;
int nextc;
int toksp;
Token tokstk[2];
Sym *dot;
#define PUSHT(t) tokstk[toksp++] = (t)
void
putw10(word w, FILE *f)
{
int i;
w &= 0777777777777;
for(i = 5; i >= 0; i--)
putc(((w>>i*6)&077)|0200, f);
}
void
writeblock(word origin, word count)
{
int i;
word chksm;
word w;
chksm = 0;
putw10(w = WORD(-count, origin-1), outf);
chksm += w;
for(i = 0; i < count; i++){
chksm += mem[i+origin];
putw10(mem[i+origin], outf);
}
putw10(-chksm, outf);
}
int
ch(void)
{
int c;
if(nextc){
c = nextc;
nextc = 0;
return c;
}
c = getchar();
tail:
if(c == '#'){
while(c = getchar(), c != '\n')
if(c == EOF) return c;
goto tail;
}
if(c == '\t' || c == '\r')
c = ' ';
return c;
}
int
chsp(void)
{
int c;
while(c = ch(), c == ' ');
return c;
}
int
hash(char *s)
{
int hsh;
hsh = 0;
for(; *s != '\0'; s++)
hsh += *s;
return hsh % SYMTABSZ;
}
Sym**
findsym(char *name)
{
int hsh;
char *p;
Sym **s;
hsh = hash(name);
s = &symtab[hsh];
for(;;){
if(*s == nil ||
strncmp((*s)->name, name, 24) == 0)
return s;
s++;
if(s == &symtab[SYMTABSZ])
s = symtab;
if(s == &symtab[hsh]){
fprintf(stderr, "symbol table full\n");
exit(1);
}
}
}
Sym*
getsym(char *name)
{
Sym **p;
p = findsym(name);
if(*p)
return *p;
*p = malloc(sizeof(Sym));
strncpy((*p)->name, name, 24);
(*p)->v.type = Undef;
(*p)->v.value = 0;
return *p;
}
word
number(void)
{
int c;
word n, oct, dec;
int sign;
sign = 1;
if(c = ch(), c == '-')
sign = -1;
else
nextc = c;
oct = dec = 0;
while(c = ch(), CTYPE(c) == Digit){
oct = (oct << 3) | (c-'0');
dec = dec*10 + (c-'0');
}
if(c == '.')
n = dec;
else{
n = oct;
nextc = c;
}
return (n*sign)&0777777777777;
}
int
strchar(int delim)
{
int c;
c = getchar();
if(delim && c == delim)
return 0400;
if(c != '\\')
return c;
c = getchar();
switch(c){
case 'b':
c = '\b';
break;
case 'n':
c = '\n';
break;
case 'r':
c = '\r';
break;
case '\\':
c = '\\';
break;
case '0':
c = 0;
break;
}
return c;
}
Token
token(void)
{
char name[24];
char *p;
int c;
Token t;
if(toksp){
t = tokstk[--toksp];
return t;
}
if(pass2){
fread(&t, sizeof(t), 1, tokf);
return t;
}
c = chsp();
if(c == EOF)
t.type = Eof;
else
switch(CTYPE(c)){
case Period:
case Letter:
p = name;
do{
if(p < name+23)
*p++ = toupper(c);
}while(c = ch(), CTYPE(c) == Letter ||
CTYPE(c) == Period ||
CTYPE(c) == Digit);
nextc = c;
*p++ = '\0';
t.type = Symbol;
t.s = getsym(name);
break;
case Digit:
nextc = c;
t.type = Word;
t.w = number();
break;
case DQuote:
t.type = Word;
t.w = strchar(0);
break;
case Comma:
c = chsp();
if(CTYPE(c) == Comma)
t.type = Cons;
else{
t.type = Comma;
nextc = c;
}
break;
case Unused:
fprintf(stderr, "unknown char: %c\n", c);
break;
default:
t.type = CTYPE(c);
break;
}
fwrite(&t, sizeof(t), 1, tokf);
return t;
}
void
directive(int type)
{
uword w;
int c, i, s;
if(type == 0){ /* ascii */
/* save ascii words in word file because they're not tokens */
if(!pass2){
c = chsp();
if(c != '"'){
fprintf(stderr, "\" expected\n");
return;
}
w = 0;
i = 0;
s = 29;
while(c = strchar('"'), c != 0400 && c != EOF){
c &= 0177;
w = w | ((uword)c << s);
s -= 7;
if(++i == 5){
fwrite(&w, sizeof(w), 1, wf);
dot->v.value++;
i = 0;
s = 29;
w = 0;
}
}
if(i){
fwrite(&w, sizeof(w), 1, wf);
dot->v.value++;
}
w = ~0;
fwrite(&w, sizeof(w), 1, wf);
dot->v.value++;
}else{
while(fread(&w, sizeof(w), 1, wf), w != ~0)
mem[dot->v.value++] = w;
}
}
}
Value
apply(int op, Value v1, Value v2)
{
switch(op){
case Not:
v1.value |= ~v2.value;
break;
case Plus:
v1.value += v2.value;
break;
case Minus:
v1.value -= v2.value;
break;
case Times:
v1.value *= v2.value;
break;
case Div:
v1.value /= v2.value;
break;
case Mod:
v1.value %= v2.value;
break;
case And:
v1.value &= v2.value;
break;
case Or:
v1.value |= v2.value;
break;
case Less:
v1.value <<= v2.value;
break;
case Great:
v1.value >>= v2.value;
break;
case Cons:
v1.value = WORD(v1.value, v2.value);
break;
default:
fprintf(stderr, "unknown op %d\n", op);
return v2;
}
v1.value &= 0777777777777;
return v1;
}
Value
expr(void)
{
Token t;
int op;
Value v, v2;
hword savedot;
v.type = Abs;
v.value = 0;
op = Plus;
/* TODO: just accept possible tokens */
while(t = token(),
t.type != RBrack && t.type != RBrace && t.type != Comma &&
t.type != LParen && t.type != RParen &&
t.type != Newline && t.type != Semi){
switch(t.type){
case Word:
v2.type = Abs;
v2.value = t.w;
v = apply(op, v, v2);
op = Plus;
break;
case Symbol:
v = apply(op, v, t.s->v);
op = Plus;
break;
case LBrack:
v2 = expr();
t = token();
if(t.type != RBrack){
fprintf(stderr, "']' expected\n");
error = 1;
PUSHT(t);
}
v = apply(op, v, v2);
op = Plus;
break;
case LBrace:
v2.type = Abs;
savedot = dot->v.value;
v2.value = assemble();
dot->v.value = savedot;
t = token();
if(t.type != RBrace){
fprintf(stderr, "'}' expected\n");
error = 1;
PUSHT(t);
}
v = apply(op, v, v2);
op = Plus;
break;
case Not:
case Plus:
case Minus:
case Times:
case Div:
case Mod:
case And:
case Or:
case Less:
case Great:
case Cons:
op = t.type;
break;
default:
fprintf(stderr, "can't parse expr %d\n", t.type);
error = 1;
v.type = Abs;
v.value = 0;
}
}
PUSHT(t);
return v;
}
word
opline(void)
{
word inst;
word op, ac, i, x, y;
word w;
Token t;
Value v;
int type;
type = 0;
ac = i = x = y = 0;
t = token();
if(t.s->v.type == Op){
op = t.s->v.value & 0777;
}else if(t.s->v.type == Io){
type = 1;
op = t.s->v.value & 077774;
}else{
fprintf(stderr, "expected opcode\n");
error = 1;
}
/* So many gotos, sorry Edsger */
t = token();
if(t.type == At){
i = 1;
t = token();
goto Y;
}
if(t.type == LParen)
goto X;
if(t.type == Newline || t.type == Semi){
PUSHT(t);
goto end;
}
PUSHT(t); /* has to be AC or Y now */
w = expr().value;
t = token();
if(t.type == Comma)
ac = w & (type == 0 ? 017 : 0774);
else{
y = w & 0777777;
if(t.type == LParen)
goto X;
PUSHT(t);
goto end;
}
t = token();
if(t.type == Newline || t.type == Semi){
PUSHT(t);
goto end;
}
if(t.type == At){
i = 1;
t = token();
}
Y:
if(t.type != LParen){
PUSHT(t);
y = expr().value & 0777777;
t = token();
if(t.type == LParen)
goto X;
PUSHT(t);
}else{
X: