ref: 345714dd56f5da8dcb2193f9cdf041cfc005d82f
dir: /sys/src/cmd/cc/lexbody/
/*
* common code for all the assemblers
*/
void
pragpack(void)
{
while(getnsc() != '\n')
;
}
void
pragvararg(void)
{
while(getnsc() != '\n')
;
}
void
pragfpround(void)
{
while(getnsc() != '\n')
;
}
void
pragprofile(void)
{
while(getnsc() != '\n')
;
}
void
pragincomplete(void)
{
while(getnsc() != '\n')
;
}
/*
* real allocs
*/
void*
alloc(long n)
{
void *p;
while((uintptr)hunk & MAXALIGN) {
hunk++;
nhunk--;
}
while(nhunk < n)
gethunk();
p = hunk;
nhunk -= n;
hunk += n;
return p;
}
void*
allocn(void *p, long on, long n)
{
void *q;
q = (uchar*)p + on;
if(q != hunk || nhunk < n) {
while(nhunk < on+n)
gethunk();
memmove(hunk, p, on);
p = hunk;
hunk += on;
nhunk -= on;
}
hunk += n;
nhunk -= n;
return p;
}
void
setinclude(char *p)
{
int i;
if(p == 0)
return;
for(i=1; i < ninclude; i++)
if(strcmp(p, include[i]) == 0)
return;
if(ninclude >= nelem(include)) {
yyerror("ninclude too small %d", nelem(include));
exits("ninclude");
}
include[ninclude++] = p;
}
void
errorexit(void)
{
if(outfile)
remove(outfile);
exits("error");
}
void
pushio(void)
{
Io *i;
i = iostack;
if(i == I) {
yyerror("botch in pushio");
errorexit();
}
i->p = fi.p;
i->c = fi.c;
}
void
newio(void)
{
Io *i;
static int pushdepth = 0;
i = iofree;
if(i == I) {
pushdepth++;
if(pushdepth > 1000) {
yyerror("macro/io expansion too deep");
errorexit();
}
i = alloc(sizeof(*i));
} else
iofree = i->link;
i->c = 0;
i->f = -1;
ionext = i;
}
void
newfile(char *s, int f)
{
Io *i;
i = ionext;
i->link = iostack;
iostack = i;
i->f = f;
if(f < 0)
i->f = open(s, 0);
if(i->f < 0) {
yyerror("%ca: %r: %s", thechar, s);
errorexit();
}
fi.c = 0;
linehist(s, 0);
}
Sym*
slookup(char *s)
{
strcpy(symb, s);
return lookup();
}
Sym*
lookup(void)
{
Sym *s;
long h;
char *p;
int c, l;
h = 0;
for(p=symb; c = *p; p++)
h = h+h+h + c;
l = (p - symb) + 1;
if(h < 0)
h = ~h;
h %= NHASH;
c = symb[0];
for(s = hash[h]; s != S; s = s->link) {
if(s->name[0] != c)
continue;
if(memcmp(s->name, symb, l) == 0)
return s;
}
s = alloc(sizeof(*s));
s->name = alloc(l);
memmove(s->name, symb, l);
s->link = hash[h];
hash[h] = s;
syminit(s);
return s;
}
long
yylex(void)
{
int c, c1;
char *cp;
Sym *s;
c = peekc;
if(c != IGN) {
peekc = IGN;
goto l1;
}
l0:
c = GETC();
l1:
if(c == EOF) {
peekc = EOF;
return -1;
}
if(isspace(c)) {
if(c == '\n') {
lineno++;
return ';';
}
goto l0;
}
if(isalpha(c))
goto talph;
if(isdigit(c))
goto tnum;
switch(c)
{
case '\n':
lineno++;
return ';';
case '#':
domacro();
goto l0;
case '.':
c = GETC();
if(isalpha(c)) {
cp = symb;
*cp++ = '.';
goto aloop;
}
if(isdigit(c)) {
cp = symb;
*cp++ = '.';
goto casedot;
}
peekc = c;
return '.';
talph:
case '_':
case '@':
cp = symb;
aloop:
*cp++ = c;
c = GETC();
if(isalpha(c) || isdigit(c) || c == '_' || c == '$')
goto aloop;
*cp = 0;
peekc = c;
s = lookup();
if(s->macro) {
newio();
cp = ionext->b;
macexpand(s, cp);
pushio();
ionext->link = iostack;
iostack = ionext;
fi.p = cp;
fi.c = strlen(cp);
if(peekc != IGN) {
cp[fi.c++] = peekc;
cp[fi.c] = 0;
peekc = IGN;
}
goto l0;
}
if(s->type == 0)
s->type = LNAME;
if(s->type == LNAME ||
s->type == LVAR ||
s->type == LLAB) {
yylval.sym = s;
return s->type;
}
yylval.lval = s->value;
return s->type;
tnum:
cp = symb;
if(c != '0')
goto dc;
*cp++ = c;
c = GETC();
c1 = 3;
if(c == 'x' || c == 'X') {
c1 = 4;
c = GETC();
} else
if(c < '0' || c > '7')
goto dc;
yylval.lval = 0;
for(;;) {
if(c >= '0' && c <= '9') {
if(c > '7' && c1 == 3)
break;
yylval.lval <<= c1;
yylval.lval += c - '0';
c = GETC();
continue;
}
if(c1 == 3)
break;
if(c >= 'A' && c <= 'F')
c += 'a' - 'A';
if(c >= 'a' && c <= 'f') {
yylval.lval <<= c1;
yylval.lval += c - 'a' + 10;
c = GETC();
continue;
}
break;
}
goto ncu;
dc:
for(;;) {
if(!isdigit(c))
break;
*cp++ = c;
c = GETC();
}
if(c == '.')
goto casedot;
if(c == 'e' || c == 'E')
goto casee;
*cp = 0;
if(sizeof(yylval.lval) == sizeof(vlong))
yylval.lval = strtoull(symb, nil, 10);
else
yylval.lval = strtoul(symb, nil, 10);
ncu:
while(c == 'U' || c == 'u' || c == 'l' || c == 'L')
c = GETC();
peekc = c;
return LCONST;
casedot:
for(;;) {
*cp++ = c;
c = GETC();
if(!isdigit(c))
break;
}
if(c == 'e' || c == 'E')
goto casee;
goto caseout;
casee:
*cp++ = 'e';
c = GETC();
if(c == '+' || c == '-') {
*cp++ = c;
c = GETC();
}
while(isdigit(c)) {
*cp++ = c;
c = GETC();
}
caseout:
*cp = 0;
peekc = c;
if(FPCHIP) {
yylval.dval = atof(symb);
return LFCONST;
}
yyerror("assembler cannot interpret fp constants");
yylval.lval = 1L;
return LCONST;
case '"':
memcpy(yylval.sval, nullgen.sval, sizeof(yylval.sval));
cp = yylval.sval;
c1 = 0;
for(;;) {
c = escchar('"');
if(c == EOF)
break;
if(c1 < sizeof(yylval.sval))
*cp++ = c;
c1++;
}
if(c1 > sizeof(yylval.sval))
yyerror("string constant too long");
return LSCONST;
case '\'':
c = escchar('\'');
if(c == EOF)
c = '\'';
if(escchar('\'') != EOF)
yyerror("missing '");
yylval.lval = c;
return LCONST;
case '/':
c1 = GETC();
if(c1 == '/') {
for(;;) {
c = GETC();
if(c == '\n')
goto l1;
if(c == EOF) {
yyerror("eof in comment");
errorexit();
}
}
}
if(c1 == '*') {
for(;;) {
c = GETC();
while(c == '*') {
c = GETC();
if(c == '/')
goto l0;
}
if(c == EOF) {
yyerror("eof in comment");
errorexit();
}
if(c == '\n')
lineno++;
}
}
break;
default:
return c;
}
peekc = c1;
return c;
}
int
getc(void)
{
int c;
c = peekc;
if(c != IGN) {
peekc = IGN;
if(c == '\n')
lineno++;
return c;
}
c = GETC();
if(c == '\n')
lineno++;
if(c == EOF) {
yyerror("End of file");
errorexit();
}
return c;
}
int
getnsc(void)
{
int c;
for(;;) {
c = getc();
if(!isspace(c) || c == '\n')
return c;
}
}
void
unget(int c)
{
peekc = c;
if(c == '\n')
lineno--;
}
int
escchar(int e)
{
int c, l;
loop:
c = getc();
if(c == '\n') {
yyerror("newline in string");
return EOF;
}
if(c != '\\') {
if(c == e)
return EOF;
return c;
}
c = getc();
if(c >= '0' && c <= '7') {
l = c - '0';
c = getc();
if(c >= '0' && c <= '7') {
l = l*8 + c-'0';
c = getc();
if(c >= '0' && c <= '7') {
l = l*8 + c-'0';
return l;
}
}
peekc = c;
return l;
}
switch(c)
{
case '\n': goto loop;
case 'n': return '\n';
case 't': return '\t';
case 'b': return '\b';
case 'r': return '\r';
case 'f': return '\f';
case 'a': return 0x07;
case 'v': return 0x0b;
case 'z': return 0x00;
}
return c;
}
void
pinit(char *f)
{
int i;
Sym *s;
lineno = 1;
newio();
newfile(f, -1);
pc = 0;
peekc = IGN;
sym = 1;
for(i=0; i<NSYM; i++) {
h[i].type = 0;
h[i].sym = S;
}
for(i=0; i<NHASH; i++)
for(s = hash[i]; s != S; s = s->link)
s->macro = 0;
}
int
filbuf(void)
{
Io *i;
loop:
i = iostack;
if(i == I)
return EOF;
if(i->f < 0)
goto pop;
fi.c = read(i->f, i->b, BUFSIZ) - 1;
if(fi.c < 0) {
close(i->f);
linehist(0, 0);
goto pop;
}
fi.p = i->b + 1;
return i->b[0];
pop:
iostack = i->link;
i->link = iofree;
iofree = i;
i = iostack;
if(i == I)
return EOF;
fi.p = i->p;
fi.c = i->c;
if(--fi.c < 0)
goto loop;
return *fi.p++;
}
void
yyerror(char *a, ...)
{
char buf[200];
va_list arg;
/*
* hack to intercept message from yaccpar
*/
if(strcmp(a, "syntax error") == 0) {
yyerror("syntax error, last name: %s", symb);
return;
}
prfile(lineno);
va_start(arg, a);
vseprint(buf, buf+sizeof(buf), a, arg);
va_end(arg);
print("%s\n", buf);
nerrors++;
if(nerrors > 10) {
print("too many errors\n");
errorexit();
}
}
void
prfile(long l)
{
int i, n;
Hist a[HISTSZ], *h;
long d;
n = 0;
for(h = hist; h != H; h = h->link) {
if(l < h->line)
break;
if(h->name) {
if(h->offset == 0) {
if(n >= 0 && n < HISTSZ)
a[n] = *h;
n++;
continue;
}
if(n > 0 && n < HISTSZ)
if(a[n-1].offset == 0) {
a[n] = *h;
n++;
} else
a[n-1] = *h;
continue;
}
n--;
if(n >= 0 && n < HISTSZ) {
d = h->line - a[n].line;
for(i=0; i<n; i++)
a[i].line += d;
}
}
if(n > HISTSZ)
n = HISTSZ;
for(i=0; i<n; i++)
print("%s:%ld ", a[i].name, (long)(l-a[i].line+a[i].offset+1));
}
void
ieeedtod(Ieee *ieee, double native)
{
double fr, ho, f;
int exp;
if(native < 0) {
ieeedtod(ieee, -native);
ieee->h |= 0x80000000L;
return;
}
if(native == 0) {
ieee->l = 0;
ieee->h = 0;
return;
}
fr = frexp(native, &exp);
f = 2097152L; /* shouldnt use fp constants here */
fr = modf(fr*f, &ho);
ieee->h = ho;
ieee->h &= 0xfffffL;
ieee->h |= (exp+1022L) << 20;
f = 65536L;
fr = modf(fr*f, &ho);
ieee->l = ho;
ieee->l <<= 16;
ieee->l |= (long)(fr*f);
}