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parse.c
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parse.c
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#include "all.h"
#include <ctype.h>
#include <stdarg.h>
enum {
Ke = -2, /* Erroneous mode */
Km = Kl, /* Memory pointer */
};
Op optab[NOp] = {
#define O(op, t, cf) [O##op]={#op, t, cf},
#include "ops.h"
};
typedef enum {
PXXX,
PLbl,
PPhi,
PIns,
PEnd,
} PState;
enum {
Txxx = 0,
/* aliases */
Tloadw = NPubOp,
Tloadl,
Tloads,
Tloadd,
Talloc1,
Talloc2,
Tcall,
Tenv,
Tphi,
Tjmp,
Tjnz,
Tret,
Texport,
Tfunc,
Ttype,
Tdata,
Tsection,
Talign,
Tl,
Tw,
Th,
Tb,
Td,
Ts,
Tz,
Tint,
Tflts,
Tfltd,
Ttmp,
Tlbl,
Tglo,
Ttyp,
Tstr,
Tplus,
Teq,
Tcomma,
Tlparen,
Trparen,
Tlbrace,
Trbrace,
Tnl,
Tdots,
Teof,
Ntok
};
static char *kwmap[Ntok] = {
[Tloadw] = "loadw",
[Tloadl] = "loadl",
[Tloads] = "loads",
[Tloadd] = "loadd",
[Talloc1] = "alloc1",
[Talloc2] = "alloc2",
[Tcall] = "call",
[Tenv] = "env",
[Tphi] = "phi",
[Tjmp] = "jmp",
[Tjnz] = "jnz",
[Tret] = "ret",
[Texport] = "export",
[Tfunc] = "function",
[Ttype] = "type",
[Tdata] = "data",
[Tsection] = "section",
[Talign] = "align",
[Tl] = "l",
[Tw] = "w",
[Th] = "h",
[Tb] = "b",
[Td] = "d",
[Ts] = "s",
[Tz] = "z",
[Tdots] = "...",
};
enum {
NPred = 63,
TMask = 16383, /* for temps hash */
BMask = 8191, /* for blocks hash */
K = 3233235, /* found using tools/lexh.c */
M = 23,
};
static char lexh[1 << (32-M)];
static FILE *inf;
static char *inpath;
static int thead;
static struct {
char chr;
double fltd;
float flts;
int64_t num;
char *str;
} tokval;
static int lnum;
static Fn *curf;
static int tmph[TMask+1];
static Phi **plink;
static Blk *curb;
static Blk **blink;
static Blk *blkh[BMask+1];
static int nblk;
static int rcls;
static uint ntyp;
void
err(char *s, ...)
{
va_list ap;
va_start(ap, s);
fprintf(stderr, "%s:%d: ", inpath, lnum);
vfprintf(stderr, s, ap);
fprintf(stderr, "\n");
va_end(ap);
exit(1);
}
static void
lexinit()
{
static int done;
int i;
long h;
if (done)
return;
for (i=0; i<NPubOp; ++i)
if (optab[i].name)
kwmap[i] = optab[i].name;
assert(Ntok <= CHAR_MAX);
for (i=0; i<Ntok; ++i)
if (kwmap[i]) {
h = hash(kwmap[i])*K >> M;
assert(lexh[h] == Txxx);
lexh[h] = i;
}
done = 1;
}
static int64_t
getint()
{
uint64_t n;
int c, m;
n = 0;
c = fgetc(inf);
m = (c == '-');
if (m || c == '+')
c = fgetc(inf);
do {
n = 10*n + (c - '0');
c = fgetc(inf);
} while ('0' <= c && c <= '9');
ungetc(c, inf);
if (m)
n = 1 + ~n;
return *(int64_t *)&n;
}
static int
lex()
{
static char tok[NString];
int c, i, esc;
int t;
do
c = fgetc(inf);
while (isblank(c));
t = Txxx;
tokval.chr = c;
switch (c) {
case EOF:
return Teof;
case ',':
return Tcomma;
case '(':
return Tlparen;
case ')':
return Trparen;
case '{':
return Tlbrace;
case '}':
return Trbrace;
case '=':
return Teq;
case '+':
return Tplus;
case 's':
if (fscanf(inf, "_%f", &tokval.flts) != 1)
break;
return Tflts;
case 'd':
if (fscanf(inf, "_%lf", &tokval.fltd) != 1)
break;
return Tfltd;
case '%':
t = Ttmp;
c = fgetc(inf);
goto Alpha;
case '@':
t = Tlbl;
c = fgetc(inf);
goto Alpha;
case '$':
t = Tglo;
if ((c = fgetc(inf)) == '"')
goto Quoted;
goto Alpha;
case ':':
t = Ttyp;
c = fgetc(inf);
goto Alpha;
case '#':
while ((c=fgetc(inf)) != '\n' && c != EOF)
;
/* fall through */
case '\n':
lnum++;
return Tnl;
}
if (isdigit(c) || c == '-' || c == '+') {
ungetc(c, inf);
tokval.num = getint();
return Tint;
}
if (c == '"') {
t = Tstr;
Quoted:
tokval.str = vnew(2, 1, Pfn);
tokval.str[0] = c;
esc = 0;
for (i=1;; i++) {
c = fgetc(inf);
if (c == EOF)
err("unterminated string");
vgrow(&tokval.str, i+2);
tokval.str[i] = c;
if (c == '"' && !esc) {
tokval.str[i+1] = 0;
return t;
}
esc = (c == '\\' && !esc);
}
}
Alpha:
if (!isalpha(c) && c != '.' && c != '_')
err("invalid character %c (%d)", c, c);
i = 0;
do {
if (i >= NString-1)
err("identifier too long");
tok[i++] = c;
c = fgetc(inf);
} while (isalpha(c) || c == '$' || c == '.' || c == '_' || isdigit(c));
tok[i] = 0;
ungetc(c, inf);
tokval.str = tok;
if (t != Txxx) {
return t;
}
t = lexh[hash(tok)*K >> M];
if (t == Txxx || strcmp(kwmap[t], tok) != 0) {
err("unknown keyword %s", tok);
return Txxx;
}
return t;
}
static int
peek()
{
if (thead == Txxx)
thead = lex();
return thead;
}
static int
next()
{
int t;
t = peek();
thead = Txxx;
return t;
}
static int
nextnl()
{
int t;
while ((t = next()) == Tnl)
;
return t;
}
static void
expect(int t)
{
static char *ttoa[] = {
[Tlbl] = "label",
[Tcomma] = ",",
[Teq] = "=",
[Tnl] = "newline",
[Tlparen] = "(",
[Trparen] = ")",
[Tlbrace] = "{",
[Trbrace] = "}",
[Teof] = 0,
};
char buf[128], *s1, *s2;
int t1;
t1 = next();
if (t == t1)
return;
s1 = ttoa[t] ? ttoa[t] : "??";
s2 = ttoa[t1] ? ttoa[t1] : "??";
sprintf(buf, "%s expected, got %s instead", s1, s2);
err(buf);
}
static Ref
tmpref(char *v)
{
int t, *h;
h = &tmph[hash(v) & TMask];
t = *h;
if (t) {
if (strcmp(curf->tmp[t].name, v) == 0)
return TMP(t);
for (t=curf->ntmp-1; t>=Tmp0; t--)
if (strcmp(curf->tmp[t].name, v) == 0)
return TMP(t);
}
t = curf->ntmp;
*h = t;
newtmp(0, Kx, curf);
strcpy(curf->tmp[t].name, v);
return TMP(t);
}
static Ref
parseref()
{
Con c;
int i;
memset(&c, 0, sizeof c);
switch (next()) {
case Ttmp:
return tmpref(tokval.str);
case Tint:
c.type = CBits;
c.bits.i = tokval.num;
goto Look;
case Tflts:
c.type = CBits;
c.bits.s = tokval.flts;
c.flt = 1;
goto Look;
case Tfltd:
c.type = CBits;
c.bits.d = tokval.fltd;
c.flt = 2;
goto Look;
case Tglo:
c.type = CAddr;
c.label = intern(tokval.str);
Look:
for (i=0; i<curf->ncon; i++)
if (curf->con[i].type == c.type
&& curf->con[i].bits.i == c.bits.i
&& curf->con[i].label == c.label)
return CON(i);
vgrow(&curf->con, ++curf->ncon);
curf->con[i] = c;
return CON(i);
default:
return R;
}
}
static int
findtyp(int i)
{
while (--i >= 0)
if (strcmp(tokval.str, typ[i].name) == 0)
return i;
err("undefined type :%s", tokval.str);
}
static int
parsecls(int *tyn)
{
switch (next()) {
default:
err("invalid class specifier");
case Ttyp:
*tyn = findtyp(ntyp);
return 4;
case Tw:
return Kw;
case Tl:
return Kl;
case Ts:
return Ks;
case Td:
return Kd;
}
}
static int
parserefl(int arg)
{
int k, ty, env, hasenv, vararg;
Ref r;
hasenv = 0;
vararg = 0;
expect(Tlparen);
while (peek() != Trparen) {
if (curi - insb >= NIns)
err("too many instructions (1)");
if (!arg && vararg)
err("no parameters allowed after '...'");
switch (peek()) {
case Tdots:
if (vararg)
err("only one '...' allowed");
vararg = 1;
if (arg) {
*curi = (Ins){.op = Oargv};
curi++;
}
next();
goto Next;
case Tenv:
if (hasenv)
err("only one environment allowed");
hasenv = 1;
env = 1;
next();
k = Kl;
break;
default:
env = 0;
k = parsecls(&ty);
break;
}
r = parseref();
if (req(r, R))
err("invalid argument");
if (!arg && rtype(r) != RTmp)
err("invalid function parameter");
if (k == 4)
if (arg)
*curi = (Ins){Oargc, Kl, R, {TYPE(ty), r}};
else
*curi = (Ins){Oparc, Kl, r, {TYPE(ty)}};
else if (env)
if (arg)
*curi = (Ins){Oarge, k, R, {r}};
else
*curi = (Ins){Opare, k, r, {R}};
else
if (arg)
*curi = (Ins){Oarg, k, R, {r}};
else
*curi = (Ins){Opar, k, r, {R}};
curi++;
Next:
if (peek() == Trparen)
break;
expect(Tcomma);
}
expect(Trparen);
return vararg;
}
static Blk *
findblk(char *name)
{
Blk *b;
uint32_t h;
h = hash(name) & BMask;
for (b=blkh[h]; b; b=b->dlink)
if (strcmp(b->name, name) == 0)
return b;
b = blknew();
b->id = nblk++;
strcpy(b->name, name);
b->dlink = blkh[h];
blkh[h] = b;
return b;
}
static void
closeblk()
{
curb->nins = curi - insb;
idup(&curb->ins, insb, curb->nins);
blink = &curb->link;
curi = insb;
}
static PState
parseline(PState ps)
{
Ref arg[NPred] = {R};
Blk *blk[NPred];
Phi *phi;
Ref r;
Blk *b;
int t, op, i, k, ty;
t = nextnl();
if (ps == PLbl && t != Tlbl && t != Trbrace)
err("label or } expected");
switch (t) {
default:
if (isstore(t)) {
case Tcall:
case Ovastart:
/* operations without result */
r = R;
k = Kw;
op = t;
goto DoOp;
}
err("label, instruction or jump expected");
case Trbrace:
return PEnd;
case Ttmp:
break;
case Tlbl:
b = findblk(tokval.str);
if (curb && curb->jmp.type == Jxxx) {
closeblk();
curb->jmp.type = Jjmp;
curb->s1 = b;
}
if (b->jmp.type != Jxxx)
err("multiple definitions of block @%s", b->name);
*blink = b;
curb = b;
plink = &curb->phi;
expect(Tnl);
return PPhi;
case Tret:
curb->jmp.type = (int[]){
Jretw, Jretl,
Jrets, Jretd,
Jretc, Jret0
}[rcls];
if (peek() == Tnl)
curb->jmp.type = Jret0;
else if (rcls < 5) {
r = parseref();
if (req(r, R))
err("invalid return value");
curb->jmp.arg = r;
}
goto Close;
case Tjmp:
curb->jmp.type = Jjmp;
goto Jump;
case Tjnz:
curb->jmp.type = Jjnz;
r = parseref();
if (req(r, R))
err("invalid argument for jnz jump");
curb->jmp.arg = r;
expect(Tcomma);
Jump:
expect(Tlbl);
curb->s1 = findblk(tokval.str);
if (curb->jmp.type != Jjmp) {
expect(Tcomma);
expect(Tlbl);
curb->s2 = findblk(tokval.str);
}
if (curb->s1 == curf->start || curb->s2 == curf->start)
err("invalid jump to the start node");
Close:
expect(Tnl);
closeblk();
return PLbl;
}
r = tmpref(tokval.str);
expect(Teq);
k = parsecls(&ty);
op = next();
DoOp:
if (op == Tphi) {
if (ps != PPhi || curb == curf->start)
err("unexpected phi instruction");
op = -1;
}
if (op == Tcall) {
arg[0] = parseref();
parserefl(1);
op = Ocall;
expect(Tnl);
if (k == 4) {
k = Kl;
arg[1] = TYPE(ty);
} else
arg[1] = R;
goto Ins;
}
if (op == Tloadw)
op = Oloadsw;
if (op >= Tloadl && op <= Tloadd)
op = Oload;
if (op == Talloc1 || op == Talloc2)
op = Oalloc;
if (k == 4)
err("size class must be w, l, s, or d");
if (op >= NPubOp)
err("invalid instruction");
i = 0;
if (peek() != Tnl)
for (;;) {
if (i == NPred)
err("too many arguments");
if (op == -1) {
expect(Tlbl);
blk[i] = findblk(tokval.str);
}
arg[i] = parseref();
if (req(arg[i], R))
err("invalid instruction argument");
i++;
t = peek();
if (t == Tnl)
break;
if (t != Tcomma)
err(", or end of line expected");
next();
}
next();
Ins:
if (op != -1) {
if (curi - insb >= NIns)
err("too many instructions (2)");
curi->op = op;
curi->cls = k;
curi->to = r;
curi->arg[0] = arg[0];
curi->arg[1] = arg[1];
curi++;
return PIns;
} else {
phi = alloc(sizeof *phi);
phi->to = r;
phi->cls = k;
phi->arg = vnew(i, sizeof arg[0], Pfn);
memcpy(phi->arg, arg, i * sizeof arg[0]);
phi->blk = vnew(i, sizeof blk[0], Pfn);
memcpy(phi->blk, blk, i * sizeof blk[0]);
phi->narg = i;
*plink = phi;
plink = &phi->link;
return PPhi;
}
}
static int
usecheck(Ref r, int k, Fn *fn)
{
return rtype(r) != RTmp || fn->tmp[r.val].cls == k
|| (fn->tmp[r.val].cls == Kl && k == Kw);
}
static void
typecheck(Fn *fn)
{
Blk *b;
Phi *p;
Ins *i;
uint n;
int k;
Tmp *t;
Ref r;
BSet pb[1], ppb[1];
fillpreds(fn);
bsinit(pb, fn->nblk);
bsinit(ppb, fn->nblk);
for (b=fn->start; b; b=b->link) {
for (p=b->phi; p; p=p->link)
fn->tmp[p->to.val].cls = p->cls;
for (i=b->ins; i<&b->ins[b->nins]; i++)
if (rtype(i->to) == RTmp) {
t = &fn->tmp[i->to.val];
if (clsmerge(&t->cls, i->cls))
err("temporary %%%s is assigned with"
" multiple types", t->name);
}
}
for (b=fn->start; b; b=b->link) {
bszero(pb);
for (n=0; n<b->npred; n++)
bsset(pb, b->pred[n]->id);
for (p=b->phi; p; p=p->link) {
bszero(ppb);
t = &fn->tmp[p->to.val];
for (n=0; n<p->narg; n++) {
k = t->cls;
if (bshas(ppb, p->blk[n]->id))
err("multiple entries for @%s in phi %%%s",
p->blk[n]->name, t->name);
if (!usecheck(p->arg[n], k, fn))
err("invalid type for operand %%%s in phi %%%s",
fn->tmp[p->arg[n].val].name, t->name);
bsset(ppb, p->blk[n]->id);
}
if (!bsequal(pb, ppb))
err("predecessors not matched in phi %%%s", t->name);
}
for (i=b->ins; i<&b->ins[b->nins]; i++)
for (n=0; n<2; n++) {
k = optab[i->op].argcls[n][i->cls];
r = i->arg[n];
t = &fn->tmp[r.val];
if (k == Ke)
err("invalid instruction type in %s",
optab[i->op].name);
if (rtype(r) == RType)
continue;
if (rtype(r) != -1 && k == Kx)
err("no %s operand expected in %s",
n == 1 ? "second" : "first",
optab[i->op].name);
if (rtype(r) == -1 && k != Kx)
err("missing %s operand in %s",
n == 1 ? "second" : "first",
optab[i->op].name);
if (!usecheck(r, k, fn))
err("invalid type for %s operand %%%s in %s",
n == 1 ? "second" : "first",
t->name, optab[i->op].name);
}
r = b->jmp.arg;
if (isret(b->jmp.type)) {
if (b->jmp.type == Jretc) {
if (!usecheck(r, Kl, fn))
goto JErr;
} else if (!usecheck(r, b->jmp.type-Jretw, fn))
goto JErr;
}
if (b->jmp.type == Jjnz && !usecheck(r, Kw, fn))
JErr:
err("invalid type for jump argument %%%s in block @%s",
fn->tmp[r.val].name, b->name);
if (b->s1 && b->s1->jmp.type == Jxxx)
err("block @%s is used undefined", b->s1->name);
if (b->s2 && b->s2->jmp.type == Jxxx)
err("block @%s is used undefined", b->s2->name);
}
}
static Fn *
parsefn(int export)
{
Blk *b;
int i;
PState ps;
curb = 0;
nblk = 0;
curi = insb;
curf = alloc(sizeof *curf);
curf->ntmp = 0;
curf->ncon = 1; /* first constant must be 0 */
curf->tmp = vnew(curf->ntmp, sizeof curf->tmp[0], Pfn);
curf->con = vnew(curf->ncon, sizeof curf->con[0], Pfn);
for (i=0; i<Tmp0; ++i)
if (T.fpr0 <= i && i < T.fpr0 + T.nfpr)
newtmp(0, Kd, curf);
else
newtmp(0, Kl, curf);
curf->con[0].type = CBits;
curf->export = export;
blink = &curf->start;
curf->retty = Kx;
if (peek() != Tglo)
rcls = parsecls(&curf->retty);
else
rcls = 5;
if (next() != Tglo)
err("function name expected");
strncpy(curf->name, tokval.str, NString-1);
curf->vararg = parserefl(0);
if (nextnl() != Tlbrace)
err("function body must start with {");
ps = PLbl;
do
ps = parseline(ps);
while (ps != PEnd);
if (!curb)
err("empty function");
if (curb->jmp.type == Jxxx)
err("last block misses jump");
curf->mem = vnew(0, sizeof curf->mem[0], Pfn);
curf->nmem = 0;
curf->nblk = nblk;
curf->rpo = 0;
for (b=0; b; b=b->link)
b->dlink = 0; /* was trashed by findblk() */
for (i=0; i<BMask+1; ++i)
blkh[i] = 0;
memset(tmph, 0, sizeof tmph);
typecheck(curf);
return curf;
}
static void
parsefields(Field *fld, Typ *ty, int t)
{
Typ *ty1;
int n, c, a, al, type;
uint64_t sz, s;
n = 0;
sz = 0;
al = ty->align;
while (t != Trbrace) {
ty1 = 0;
switch (t) {
default: err("invalid type member specifier");
case Td: type = Fd; s = 8; a = 3; break;
case Tl: type = Fl; s = 8; a = 3; break;
case Ts: type = Fs; s = 4; a = 2; break;
case Tw: type = Fw; s = 4; a = 2; break;
case Th: type = Fh; s = 2; a = 1; break;
case Tb: type = Fb; s = 1; a = 0; break;
case Ttyp:
type = FTyp;
ty1 = &typ[findtyp(ntyp-1)];
s = ty1->size;
a = ty1->align;
break;
}
if (a > al)
al = a;
a = (1 << a) - 1;
a = ((sz + a) & ~a) - sz;
if (a) {
if (n < NField) {
/* padding */
fld[n].type = FPad;
fld[n].len = a;
n++;
}
}
t = nextnl();
if (t == Tint) {
c = tokval.num;
t = nextnl();
} else
c = 1;
sz += a + c*s;
if (type == FTyp)
s = ty1 - typ;
for (; c>0 && n<NField; c--, n++) {
fld[n].type = type;
fld[n].len = s;
}
if (t != Tcomma)
break;
t = nextnl();
}
if (t != Trbrace)
err(", or } expected");
fld[n].type = FEnd;
a = 1 << al;
if (sz < ty->size)
sz = ty->size;
ty->size = (sz + a - 1) & -a;
ty->align = al;
}
static void
parsetyp()
{
Typ *ty;
int t, al;
uint n;
/* be careful if extending the syntax
* to handle nested types, any pointer
* held to typ[] might be invalidated!
*/
vgrow(&typ, ntyp+1);
ty = &typ[ntyp++];
ty->dark = 0;
ty->align = -1;
ty->size = 0;
if (nextnl() != Ttyp || nextnl() != Teq)
err("type name and then = expected");
strcpy(ty->name, tokval.str);
t = nextnl();
if (t == Talign) {
if (nextnl() != Tint)
err("alignment expected");
for (al=0; tokval.num /= 2; al++)
;
ty->align = al;
t = nextnl();
}
if (t != Tlbrace)
err("type body must start with {");
t = nextnl();
if (t == Tint) {
ty->dark = 1;
ty->size = tokval.num;
if (ty->align == -1)
err("dark types need alignment");
if (nextnl() != Trbrace)
err("} expected");
return;
}
n = 0;
ty->fields = vnew(1, sizeof ty->fields[0], Pheap);
if (t == Tlbrace)
do {
if (t != Tlbrace)
err("invalid union member");
vgrow(&ty->fields, n+1);
parsefields(ty->fields[n++], ty, nextnl());
t = nextnl();
} while (t != Trbrace);
else
parsefields(ty->fields[n++], ty, t);
ty->nunion = n;
}
static void
parsedatref(Dat *d)
{
int t;
d->isref = 1;
d->u.ref.nam = tokval.str;
d->u.ref.off = 0;
t = peek();
if (t == Tplus) {
next();
if (next() != Tint)
err("invalid token after offset in ref");
d->u.ref.off = tokval.num;
}
}
static void
parsedatstr(Dat *d)
{
d->isstr = 1;
d->u.str = tokval.str;
}