ref: 37e4ce0ea75ae0e9a71d773d7fc7f16fd3d64fe7
dir: /sys/src/cmd/cc/sub.c/
#include "cc.h"
Node*
new(int t, Node *l, Node *r)
{
Node *n;
n = alloc(sizeof(*n));
n->op = t;
n->left = l;
n->right = r;
if(l && t != OGOTO)
n->lineno = l->lineno;
else if(r)
n->lineno = r->lineno;
else
n->lineno = lineno;
newflag = 1;
return n;
}
Node*
new1(int o, Node *l, Node *r)
{
Node *n;
n = new(o, l, r);
n->lineno = nearln;
return n;
}
void
prtree(Node *n, char *s)
{
print(" == %s ==\n", s);
prtree1(n, 0, 0);
print("\n");
}
void
prtree1(Node *n, int d, int f)
{
int i;
if(f)
for(i=0; i<d; i++)
print(" ");
if(n == Z) {
print("Z\n");
return;
}
if(n->op == OLIST) {
prtree1(n->left, d, 0);
prtree1(n->right, d, 1);
return;
}
d++;
print("%O", n->op);
i = 3;
switch(n->op)
{
case ONAME:
print(" \"%F\"", n);
print(" %ld", n->xoffset);
i = 0;
break;
case OINDREG:
print(" %ld(R%d)", n->xoffset, n->reg);
i = 0;
break;
case OREGISTER:
if(n->xoffset)
print(" %ld+R%d", n->xoffset, n->reg);
else
print(" R%d", n->reg);
i = 0;
break;
case OSTRING:
print(" \"%s\"", n->cstring);
i = 0;
break;
case OLSTRING:
print(" \"%S\"", n->rstring);
i = 0;
break;
case ODOT:
case OELEM:
print(" \"%F\"", n);
break;
case OCONST:
if(typefd[n->type->etype])
print(" \"%.8e\"", n->fconst);
else
print(" \"%lld\"", n->vconst);
i = 0;
break;
}
if(n->addable != 0)
print(" <%d>", n->addable);
if(n->type != T)
print(" %T", n->type);
if(n->complex != 0)
print(" (%d)", n->complex);
print(" %L\n", n->lineno);
if(i & 2)
prtree1(n->left, d, 1);
if(i & 1)
prtree1(n->right, d, 1);
}
Type*
typ(int et, Type *d)
{
Type *t;
t = alloc(sizeof(*t));
t->etype = et;
t->link = d;
t->down = T;
t->sym = S;
t->width = ewidth[et];
t->offset = 0;
t->shift = 0;
t->nbits = 0;
t->garb = 0;
return t;
}
Type*
copytyp(Type *t)
{
Type *nt;
nt = typ(TXXX, T);
*nt = *t;
return nt;
}
Type*
garbt(Type *t, long b)
{
Type *t1;
if(b & BGARB) {
t1 = copytyp(t);
t1->garb = simpleg(b);
return t1;
}
return t;
}
int
simpleg(long b)
{
b &= BGARB;
switch(b) {
case BCONSTNT:
return GCONSTNT;
case BVOLATILE:
return GVOLATILE;
case BVOLATILE|BCONSTNT:
return GCONSTNT|GVOLATILE;
}
return GXXX;
}
int
simplec(long b)
{
b &= BCLASS;
switch(b) {
case 0:
case BREGISTER:
return CXXX;
case BAUTO:
case BAUTO|BREGISTER:
return CAUTO;
case BEXTERN:
return CEXTERN;
case BEXTERN|BREGISTER:
return CEXREG;
case BSTATIC:
return CSTATIC;
case BTYPEDEF:
return CTYPEDEF;
case BTYPESTR:
return CTYPESTR;
}
diag(Z, "illegal combination of classes %Q", b);
return CXXX;
}
Type*
simplet(long b)
{
b &= ~BCLASS & ~BGARB;
switch(b) {
case BCHAR:
case BCHAR|BSIGNED:
return types[TCHAR];
case BCHAR|BUNSIGNED:
return types[TUCHAR];
case BSHORT:
case BSHORT|BINT:
case BSHORT|BSIGNED:
case BSHORT|BINT|BSIGNED:
return types[TSHORT];
case BUNSIGNED|BSHORT:
case BUNSIGNED|BSHORT|BINT:
return types[TUSHORT];
case 0:
case BINT:
case BINT|BSIGNED:
case BSIGNED:
return types[TINT];
case BUNSIGNED:
case BUNSIGNED|BINT:
return types[TUINT];
case BLONG:
case BLONG|BINT:
case BLONG|BSIGNED:
case BLONG|BINT|BSIGNED:
return types[TLONG];
case BUNSIGNED|BLONG:
case BUNSIGNED|BLONG|BINT:
return types[TULONG];
case BVLONG|BLONG:
case BVLONG|BLONG|BINT:
case BVLONG|BLONG|BSIGNED:
case BVLONG|BLONG|BINT|BSIGNED:
return types[TVLONG];
case BVLONG|BLONG|BUNSIGNED:
case BVLONG|BLONG|BINT|BUNSIGNED:
return types[TUVLONG];
case BFLOAT:
return types[TFLOAT];
case BDOUBLE:
case BDOUBLE|BLONG:
case BFLOAT|BLONG:
return types[TDOUBLE];
case BVOID:
return types[TVOID];
}
diag(Z, "illegal combination of types %Q", b);
return types[TINT];
}
int
stcompat(Node *n, Type *t1, Type *t2, long ttab[])
{
int i;
ulong b;
i = 0;
if(t2 != T)
i = t2->etype;
b = 1L << i;
i = 0;
if(t1 != T)
i = t1->etype;
if(b & ttab[i]) {
if(ttab == tasign)
if(b == BSTRUCT || b == BUNION)
if(!sametype(t1, t2))
return 1;
if(n->op != OCAST)
if(b == BIND && i == TIND)
if(!sametype(t1, t2))
return 1;
return 0;
}
return 1;
}
int
tcompat(Node *n, Type *t1, Type *t2, long ttab[])
{
if(stcompat(n, t1, t2, ttab)) {
if(t1 == T)
diag(n, "incompatible type: \"%T\" for op \"%O\"",
t2, n->op);
else
diag(n, "incompatible types: \"%T\" and \"%T\" for op \"%O\"",
t1, t2, n->op);
return 1;
}
return 0;
}
void
makedot(Node *n, Type *t, long o)
{
Node *n1, *n2;
if(t->nbits) {
n1 = new(OXXX, Z, Z);
*n1 = *n;
n->op = OBIT;
n->left = n1;
n->right = Z;
n->type = t;
n->addable = n1->left->addable;
n = n1;
}
n->addable = n->left->addable;
if(n->addable == 0) {
n1 = new1(OCONST, Z, Z);
n1->vconst = o;
n1->type = types[TLONG];
n->right = n1;
n->type = t;
return;
}
n->left->type = t;
if(o == 0) {
*n = *n->left;
return;
}
n->type = t;
n1 = new1(OCONST, Z, Z);
n1->vconst = o;
t = typ(TIND, t);
t->width = types[TIND]->width;
n1->type = t;
n2 = new1(OADDR, n->left, Z);
n2->type = t;
n1 = new1(OADD, n1, n2);
n1->type = t;
n->op = OIND;
n->left = n1;
n->right = Z;
}
Type*
dotsearch(Sym *s, Type *t, Node *n, long *off)
{
Type *t1, *xt, *rt;
xt = T;
/*
* look it up by name
*/
for(t1 = t; t1 != T; t1 = t1->down)
if(t1->sym == s) {
if(xt != T)
goto ambig;
xt = t1;
}
/*
* look it up by type
*/
if(s->class == CTYPEDEF || s->class == CTYPESTR)
for(t1 = t; t1 != T; t1 = t1->down)
if(t1->sym == S && typesu[t1->etype])
if(sametype(s->type, t1)) {
if(xt != T)
goto ambig;
xt = t1;
}
if(xt != T) {
*off = xt->offset;
return xt;
}
/*
* look it up in unnamed substructures
*/
for(t1 = t; t1 != T; t1 = t1->down)
if(t1->sym == S && typesu[t1->etype]){
rt = dotsearch(s, t1->link, n, off);
if(rt != T) {
if(xt != T)
goto ambig;
xt = rt;
*off += t1->offset;
}
}
return xt;
ambig:
diag(n, "ambiguous structure element: %s", s->name);
return xt;
}
long
dotoffset(Type *st, Type *lt, Node *n)
{
Type *t;
Sym *g;
long o, o1;
o = -1;
/*
* first try matching at the top level
* for matching tag names
*/
g = st->tag;
if(g != S)
for(t=lt->link; t!=T; t=t->down)
if(t->sym == S)
if(g == t->tag) {
if(o >= 0)
goto ambig;
o = t->offset;
}
if(o >= 0)
return o;
/*
* second try matching at the top level
* for similar types
*/
for(t=lt->link; t!=T; t=t->down)
if(t->sym == S)
if(sametype(st, t)) {
if(o >= 0)
goto ambig;
o = t->offset;
}
if(o >= 0)
return o;
/*
* last try matching sub-levels
*/
for(t=lt->link; t!=T; t=t->down)
if(t->sym == S)
if(typesu[t->etype]) {
o1 = dotoffset(st, t, n);
if(o1 >= 0) {
if(o >= 0)
goto ambig;
o = o1 + t->offset;
}
}
return o;
ambig:
diag(n, "ambiguous unnamed structure element");
return o;
}
/*
* look into tree for floating point constant expressions
*/
int
allfloat(Node *n, int flag)
{
if(n != Z) {
if(n->type->etype != TDOUBLE)
return 1;
switch(n->op) {
case OCONST:
if(flag)
n->type = types[TFLOAT];
return 1;
case OADD: /* no need to get more exotic than this */
case OSUB:
case OMUL:
case ODIV:
if(!allfloat(n->right, flag))
break;
case OCAST:
if(!allfloat(n->left, flag))
break;
if(flag)
n->type = types[TFLOAT];
return 1;
}
}
return 0;
}
void
constas(Node *n, Type *il, Type *ir)
{
Type *l, *r;
l = il;
r = ir;
if(l == T)
return;
if(l->garb & GCONSTNT) {
warn(n, "assignment to a constant type (%T)", il);
return;
}
if(r == T)
return;
for(;;) {
if(l->etype != TIND || r->etype != TIND)
break;
l = l->link;
r = r->link;
if(l == T || r == T)
break;
if(r->garb & GCONSTNT)
if(!(l->garb & GCONSTNT)) {
warn(n, "assignment of a constant pointer type (%T)", ir);
break;
}
}
}
void
typeext1(Type *st, Node *l)
{
if(st->etype == TFLOAT && allfloat(l, 0))
allfloat(l, 1);
}
void
typeext(Type *st, Node *l)
{
Type *lt;
Node *n1, *n2;
long o;
lt = l->type;
if(lt == T)
return;
if(st->etype == TIND && vconst(l) == 0) {
l->type = st;
l->vconst = 0;
return;
}
typeext1(st, l);
/*
* extension of C
* if assign of struct containing unnamed sub-struct
* to type of sub-struct, insert the DOT.
* if assign of *struct containing unnamed substruct
* to type of *sub-struct, insert the add-offset
*/
if(typesu[st->etype] && typesu[lt->etype]) {
o = dotoffset(st, lt, l);
if(o >= 0) {
n1 = new1(OXXX, Z, Z);
*n1 = *l;
l->op = ODOT;
l->left = n1;
l->right = Z;
makedot(l, st, o);
}
return;
}
if(st->etype == TIND && typesu[st->link->etype])
if(lt->etype == TIND && typesu[lt->link->etype]) {
o = dotoffset(st->link, lt->link, l);
if(o >= 0) {
l->type = st;
if(o == 0)
return;
n1 = new1(OXXX, Z, Z);
*n1 = *l;
n2 = new1(OCONST, Z, Z);
n2->vconst = o;
n2->type = st;
l->op = OADD;
l->left = n1;
l->right = n2;
}
return;
}
}
/*
* a cast that generates no code
* (same size move)
*/
int
nocast(Type *t1, Type *t2)
{
int i, b;
if(t1->nbits)
return 0;
i = 0;
if(t2 != T)
i = t2->etype;
b = 1<<i;
i = 0;
if(t1 != T)
i = t1->etype;
if(b & ncast[i])
return 1;
return 0;
}
/*
* a cast that has a noop semantic
* (small to large, convert)
*/
int
nilcast(Type *t1, Type *t2)
{
int et1, et2;
if(t1 == T)
return 0;
if(t1->nbits)
return 0;
if(t2 == T)
return 0;
et1 = t1->etype;
et2 = t2->etype;
if(et1 == et2)
return 1;
if(typefd[et1] && typefd[et2]) {
if(ewidth[et1] < ewidth[et2])
return 1;
return 0;
}
if(typechlp[et1] && typechlp[et2]) {
if(ewidth[et1] < ewidth[et2])
return 1;
return 0;
}
return 0;
}
/*
* "the usual arithmetic conversions are performed"
*/
void
arith(Node *n, int f)
{
Type *t1, *t2;
int i, j, k;
Node *n1;
long w;
t1 = n->left->type;
if(n->right == Z)
t2 = t1;
else
t2 = n->right->type;
i = TXXX;
if(t1 != T)
i = t1->etype;
j = TXXX;
if(t2 != T)
j = t2->etype;
k = tab[i][j];
if(k == TIND) {
if(i == TIND)
n->type = t1;
else
if(j == TIND)
n->type = t2;
} else {
/* convert up to at least int */
if(f == 1)
while(k < TINT)
k += 2;
n->type = types[k];
}
if(n->op == OSUB)
if(i == TIND && j == TIND) {
w = n->right->type->link->width;
if(w < 1 || n->left->type->link == T || n->left->type->link->width < 1)
goto bad;
n->type = types[ewidth[TIND] <= ewidth[TLONG]? TLONG: TVLONG];
if(1 && ewidth[TIND] > ewidth[TLONG]){
n1 = new1(OXXX, Z, Z);
*n1 = *n;
n->op = OCAST;
n->left = n1;
n->right = Z;
n->type = types[TLONG];
}
if(w > 1) {
n1 = new1(OXXX, Z, Z);
*n1 = *n;
n->op = ODIV;
n->left = n1;
n1 = new1(OCONST, Z, Z);
n1->vconst = w;
n1->type = n->type;
n->right = n1;
w = vlog(n1);
if(w >= 0) {
n->op = OASHR;
n1->vconst = w;
}
}
return;
}
if(!sametype(n->type, n->left->type)) {
n->left = new1(OCAST, n->left, Z);
n->left->type = n->type;
if(n->type->etype == TIND) {
w = n->type->link->width;
if(w < 1) {
snap(n->type->link);
w = n->type->link->width;
if(w < 1)
goto bad;
}
if(w > 1) {
n1 = new1(OCONST, Z, Z);
n1->vconst = w;
n1->type = n->type;
n->left = new1(OMUL, n->left, n1);
n->left->type = n->type;
}
}
}
if(n->right != Z)
if(!sametype(n->type, n->right->type)) {
n->right = new1(OCAST, n->right, Z);
n->right->type = n->type;
if(n->type->etype == TIND) {
w = n->type->link->width;
if(w < 1) {
snap(n->type->link);
w = n->type->link->width;
if(w < 1)
goto bad;
}
if(w != 1) {
n1 = new1(OCONST, Z, Z);
n1->vconst = w;
n1->type = n->type;
n->right = new1(OMUL, n->right, n1);
n->right->type = n->type;
}
}
}
return;
bad:
diag(n, "pointer addition not fully declared: %T", n->type->link);
}
/*
* try to rewrite shift & mask
*/
void
simplifyshift(Node *n)
{
ulong c3;
int o, s1, s2, c1, c2;
if(!typechlp[n->type->etype])
return;
switch(n->op) {
default:
return;
case OASHL:
s1 = 0;
break;
case OLSHR:
s1 = 1;
break;
case OASHR:
s1 = 2;
break;
}
if(n->right->op != OCONST)
return;
if(n->left->op != OAND)
return;
if(n->left->right->op != OCONST)
return;
switch(n->left->left->op) {
default:
return;
case OASHL:
s2 = 0;
break;
case OLSHR:
s2 = 1;
break;
case OASHR:
s2 = 2;
break;
}
if(n->left->left->right->op != OCONST)
return;
c1 = n->right->vconst;
c2 = n->left->left->right->vconst;
c3 = n->left->right->vconst;
/*
if(debug['h'])
print("%.3o %ld %ld %d #%.lux\n",
(s1<<3)|s2, c1, c2, topbit(c3), c3);
*/
o = n->op;
switch((s1<<3)|s2) {
case 000: /* (((e <<u c2) & c3) <<u c1) */
c3 >>= c2;
c1 += c2;
if(c1 >= 32)
break;
goto rewrite1;
case 002: /* (((e >>s c2) & c3) <<u c1) */
if(topbit(c3) >= (32-c2))
break;
case 001: /* (((e >>u c2) & c3) <<u c1) */
if(c1 > c2) {
c3 <<= c2;
c1 -= c2;
o = OASHL;
goto rewrite1;
}
c3 <<= c1;
if(c1 == c2)
goto rewrite0;
c1 = c2-c1;
o = OLSHR;
goto rewrite2;
case 022: /* (((e >>s c2) & c3) >>s c1) */
if(c2 <= 0)
break;
case 012: /* (((e >>s c2) & c3) >>u c1) */
if(topbit(c3) >= (32-c2))
break;
goto s11;
case 021: /* (((e >>u c2) & c3) >>s c1) */
if(topbit(c3) >= 31 && c2 <= 0)
break;
goto s11;
case 011: /* (((e >>u c2) & c3) >>u c1) */
s11:
c3 <<= c2;
c1 += c2;
if(c1 >= 32)
break;
o = OLSHR;
goto rewrite1;
case 020: /* (((e <<u c2) & c3) >>s c1) */
if(topbit(c3) >= 31)
break;
case 010: /* (((e <<u c2) & c3) >>u c1) */
c3 >>= c1;
if(c1 == c2)
goto rewrite0;
if(c1 > c2) {
c1 -= c2;
goto rewrite2;
}
c1 = c2 - c1;
o = OASHL;
goto rewrite2;
}
return;
rewrite0: /* get rid of both shifts */
if(debug['<'])prtree(n, "rewrite0");
*n = *n->left;
n->left = n->left->left;
n->right->vconst = c3;
return;
rewrite1: /* get rid of lower shift */
if(debug['<'])prtree(n, "rewrite1");
n->left->left = n->left->left->left;
n->left->right->vconst = c3;
n->right->vconst = c1;
n->op = o;
return;
rewrite2: /* get rid of upper shift */
if(debug['<'])prtree(n, "rewrite2");
*n = *n->left;
n->right->vconst = c3;
n->left->right->vconst = c1;
n->left->op = o;
}
int
side(Node *n)
{
loop:
if(n != Z)
switch(n->op) {
case OCAST:
case ONOT:
case OADDR:
case OIND:
n = n->left;
goto loop;
case OCOND:
if(side(n->left))
break;
n = n->right;
case OEQ:
case ONE:
case OLT:
case OGE:
case OGT:
case OLE:
case OADD:
case OSUB:
case OMUL:
case OLMUL:
case ODIV:
case OLDIV:
case OLSHR:
case OASHL:
case OASHR:
case OAND:
case OOR:
case OXOR:
case OMOD:
case OLMOD:
case OANDAND:
case OOROR:
case OCOMMA:
case ODOT:
if(side(n->left))
break;
n = n->right;
goto loop;
case OSIGN:
case OSIZE:
case OCONST:
case OSTRING:
case OLSTRING:
case ONAME:
return 0;
}
return 1;
}
int
vconst(Node *n)
{
int i;
if(n == Z)
goto no;
if(n->op != OCONST)
goto no;
if(n->type == T)
goto no;
switch(n->type->etype)
{
case TFLOAT:
case TDOUBLE:
i = 100;
if(n->fconst > i || n->fconst < -i)
goto no;
i = n->fconst;
if(i != n->fconst)
goto no;
return i;
case TVLONG:
case TUVLONG:
i = n->vconst;
if(i != n->vconst)
goto no;
return i;
case TCHAR:
case TUCHAR:
case TSHORT:
case TUSHORT:
case TINT:
case TUINT:
case TLONG:
case TULONG:
case TIND:
i = n->vconst;
if(i != n->vconst)
goto no;
return i;
}
no:
return -159; /* first uninteresting constant */
}
/*
* return log(n) if n is a power of 2 constant
*/
int
log2(uvlong v)
{
int s, i;
uvlong m;
s = 0;
m = MASK(8*sizeof(uvlong));
for(i=32; i; i>>=1) {
m >>= i;
if(!(v & m)) {
v >>= i;
s += i;
}
}
if(v == 1)
return s;
return -1;
}
int
vlog(Node *n)
{
if(n->op != OCONST)
goto bad;
if(typefd[n->type->etype])
goto bad;
return log2(n->vconst);
bad:
return -1;
}
int
topbit(ulong v)
{
int i;
for(i = -1; v; i++)
v >>= 1;
return i;
}
/*
* try to cast a constant down
* rather than cast a variable up
* example:
* if(c == 'a')
*/
void
relcon(Node *l, Node *r)
{
vlong v;
if(l->op != OCONST)
return;
if(r->op != OCAST)
return;
if(!nilcast(r->left->type, r->type))
return;
switch(r->type->etype) {
default:
return;
case TCHAR:
case TUCHAR:
case TSHORT:
case TUSHORT:
v = convvtox(l->vconst, r->type->etype);
if(v != l->vconst)
return;
break;
}
l->type = r->left->type;
*r = *r->left;
}
int
relindex(int o)
{
switch(o) {
default:
diag(Z, "bad in relindex: %O", o);
case OEQ: return 0;
case ONE: return 1;
case OLE: return 2;
case OLS: return 3;
case OLT: return 4;
case OLO: return 5;
case OGE: return 6;
case OHS: return 7;
case OGT: return 8;
case OHI: return 9;
}
}
Node*
invert(Node *n)
{
Node *i;
if(n == Z || n->op != OLIST)
return n;
i = n;
for(n = n->left; n != Z; n = n->left) {
if(n->op != OLIST)
break;
i->left = n->right;
n->right = i;
i = n;
}
i->left = n;
return i;
}
int
bitno(long b)
{
int i;
for(i=0; i<32; i++)
if(b & (1L<<i))
return i;
diag(Z, "bad in bitno");
return 0;
}
long
typebitor(long a, long b)
{
long c;
c = a | b;
if(a & b)
if((a & b) == BLONG)
c |= BVLONG; /* long long => vlong */
else
warn(Z, "once is enough: %Q", a & b);
return c;
}
void
diag(Node *n, char *fmt, ...)
{
char buf[STRINGSZ];
va_list arg;
va_start(arg, fmt);
vseprint(buf, buf+sizeof(buf), fmt, arg);
va_end(arg);
Bprint(&diagbuf, "%L %s\n", (n==Z)? nearln: n->lineno, buf);
if(debug['X']){
Bflush(&diagbuf);
abort();
}
if(n != Z)
if(debug['v'])
prtree(n, "diagnostic");
nerrors++;
if(nerrors > 10) {
Bprint(&diagbuf, "too many errors\n");
errorexit();
}
}
void
warn(Node *n, char *fmt, ...)
{
char buf[STRINGSZ];
va_list arg;
if(debug['w']) {
Bprint(&diagbuf, "warning: ");
va_start(arg, fmt);
vseprint(buf, buf+sizeof(buf), fmt, arg);
va_end(arg);
Bprint(&diagbuf, "%L %s\n", (n==Z)? nearln: n->lineno, buf);
if(n != Z)
if(debug['v'])
prtree(n, "warning");
}
}
void
yyerror(char *fmt, ...)
{
char buf[STRINGSZ];
va_list arg;
/*
* hack to intercept message from yaccpar
*/
if(strcmp(fmt, "syntax error") == 0) {
yyerror("syntax error, last name: %s", symb);
return;
}
va_start(arg, fmt);
vseprint(buf, buf+sizeof(buf), fmt, arg);
va_end(arg);
Bprint(&diagbuf, "%L %s\n", lineno, buf);
nerrors++;
if(nerrors > 10) {
Bprint(&diagbuf, "too many errors\n");
errorexit();
}
}
void
fatal(Node *n, char *fmt, ...)
{
char buf[STRINGSZ];
va_list arg;
va_start(arg, fmt);
vseprint(buf, buf+sizeof(buf), fmt, arg);
va_end(arg);
Bprint(&diagbuf, "%L %s\n", (n==Z)? nearln: n->lineno, buf);
if(debug['X']){
Bflush(&diagbuf);
abort();
}
if(n != Z)
if(debug['v'])
prtree(n, "diagnostic");
nerrors++;
errorexit();
}
ulong thash1 = 0x2edab8c9;
ulong thash2 = 0x1dc74fb8;
ulong thash3 = 0x1f241331;
ulong thash[NALLTYPES];
Init thashinit[] =
{
TXXX, 0x17527bbd, 0,
TCHAR, 0x5cedd32b, 0,
TUCHAR, 0x552c4454, 0,
TSHORT, 0x63040b4b, 0,
TUSHORT, 0x32a45878, 0,
TINT, 0x4151d5bd, 0,
TUINT, 0x5ae707d6, 0,
TLONG, 0x5ef20f47, 0,
TULONG, 0x36d8eb8f, 0,
TVLONG, 0x6e5e9590, 0,
TUVLONG, 0x75910105, 0,
TFLOAT, 0x25fd7af1, 0,
TDOUBLE, 0x7c40a1b2, 0,
TIND, 0x1b832357, 0,
TFUNC, 0x6babc9cb, 0,
TARRAY, 0x7c50986d, 0,
TVOID, 0x44112eff, 0,
TSTRUCT, 0x7c2da3bf, 0,
TUNION, 0x3eb25e98, 0,
TENUM, 0x44b54f61, 0,
TFILE, 0x19242ac3, 0,
TOLD, 0x22b15988, 0,
TDOT, 0x0204f6b3, 0,
-1, 0, 0,
};
char* bnames[NALIGN];
Init bnamesinit[] =
{
Axxx, 0, "Axxx",
Ael1, 0, "el1",
Ael2, 0, "el2",
Asu2, 0, "su2",
Aarg0, 0, "arg0",
Aarg1, 0, "arg1",
Aarg2, 0, "arg2",
Aaut3, 0, "aut3",
-1, 0, 0,
};
char* tnames[NALLTYPES];
Init tnamesinit[] =
{
TXXX, 0, "TXXX",
TCHAR, 0, "CHAR",
TUCHAR, 0, "UCHAR",
TSHORT, 0, "SHORT",
TUSHORT, 0, "USHORT",
TINT, 0, "INT",
TUINT, 0, "UINT",
TLONG, 0, "LONG",
TULONG, 0, "ULONG",
TVLONG, 0, "VLONG",
TUVLONG, 0, "UVLONG",
TFLOAT, 0, "FLOAT",
TDOUBLE, 0, "DOUBLE",
TIND, 0, "IND",
TFUNC, 0, "FUNC",
TARRAY, 0, "ARRAY",
TVOID, 0, "VOID",
TSTRUCT, 0, "STRUCT",
TUNION, 0, "UNION",
TENUM, 0, "ENUM",
TFILE, 0, "FILE",
TOLD, 0, "OLD",
TDOT, 0, "DOT",
-1, 0, 0,
};
char* gnames[NGTYPES];
Init gnamesinit[] =
{
GXXX, 0, "GXXX",
GCONSTNT, 0, "CONST",
GVOLATILE, 0, "VOLATILE",
GVOLATILE|GCONSTNT, 0, "CONST-VOLATILE",
-1, 0, 0,
};
char* qnames[NALLTYPES];
Init qnamesinit[] =
{
TXXX, 0, "TXXX",
TCHAR, 0, "CHAR",
TUCHAR, 0, "UCHAR",
TSHORT, 0, "SHORT",
TUSHORT, 0, "USHORT",
TINT, 0, "INT",
TUINT, 0, "UINT",
TLONG, 0, "LONG",
TULONG, 0, "ULONG",
TVLONG, 0, "VLONG",
TUVLONG, 0, "UVLONG",
TFLOAT, 0, "FLOAT",
TDOUBLE, 0, "DOUBLE",
TIND, 0, "IND",
TFUNC, 0, "FUNC",
TARRAY, 0, "ARRAY",
TVOID, 0, "VOID",
TSTRUCT, 0, "STRUCT",
TUNION, 0, "UNION",
TENUM, 0, "ENUM",
TAUTO, 0, "AUTO",
TEXTERN, 0, "EXTERN",
TSTATIC, 0, "STATIC",
TTYPEDEF, 0, "TYPEDEF",
TTYPESTR, 0, "TYPESTR",
TREGISTER, 0, "REGISTER",
TCONSTNT, 0, "CONSTNT",
TVOLATILE, 0, "VOLATILE",
TUNSIGNED, 0, "UNSIGNED",
TSIGNED, 0, "SIGNED",
TDOT, 0, "DOT",
TFILE, 0, "FILE",
TOLD, 0, "OLD",
-1, 0, 0,
};
char* cnames[NCTYPES];
Init cnamesinit[] =
{
CXXX, 0, "CXXX",
CAUTO, 0, "AUTO",
CEXTERN, 0, "EXTERN",
CGLOBL, 0, "GLOBL",
CSTATIC, 0, "STATIC",
CLOCAL, 0, "LOCAL",
CTYPEDEF, 0, "TYPEDEF",
CTYPESTR, 0, "TYPESTR",
CPARAM, 0, "PARAM",
CSELEM, 0, "SELEM",
CLABEL, 0, "LABEL",
CEXREG, 0, "EXREG",
-1, 0, 0,
};
char* onames[OEND+1];
Init onamesinit[] =
{
OXXX, 0, "OXXX",
OADD, 0, "ADD",
OADDR, 0, "ADDR",
OAND, 0, "AND",
OANDAND, 0, "ANDAND",
OARRAY, 0, "ARRAY",
OAS, 0, "AS",
OASI, 0, "ASI",
OASADD, 0, "ASADD",
OASAND, 0, "ASAND",
OASASHL, 0, "ASASHL",
OASASHR, 0, "ASASHR",
OASDIV, 0, "ASDIV",
OASHL, 0, "ASHL",
OASHR, 0, "ASHR",
OASLDIV, 0, "ASLDIV",
OASLMOD, 0, "ASLMOD",
OASLMUL, 0, "ASLMUL",
OASLSHR, 0, "ASLSHR",
OASMOD, 0, "ASMOD",
OASMUL, 0, "ASMUL",
OASOR, 0, "ASOR",
OASSUB, 0, "ASSUB",
OASXOR, 0, "ASXOR",
OBIT, 0, "BIT",
OBREAK, 0, "BREAK",
OCASE, 0, "CASE",
OCAST, 0, "CAST",
OCOMMA, 0, "COMMA",
OCOND, 0, "COND",
OCONST, 0, "CONST",
OCONTINUE, 0, "CONTINUE",
ODIV, 0, "DIV",
ODOT, 0, "DOT",
ODOTDOT, 0, "DOTDOT",
ODWHILE, 0, "DWHILE",
OENUM, 0, "ENUM",
OEQ, 0, "EQ",
OFOR, 0, "FOR",
OFUNC, 0, "FUNC",
OGE, 0, "GE",
OGOTO, 0, "GOTO",
OGT, 0, "GT",
OHI, 0, "HI",
OHS, 0, "HS",
OIF, 0, "IF",
OIND, 0, "IND",
OINDREG, 0, "INDREG",
OINIT, 0, "INIT",
OLABEL, 0, "LABEL",
OLDIV, 0, "LDIV",
OLE, 0, "LE",
OLIST, 0, "LIST",
OLMOD, 0, "LMOD",
OLMUL, 0, "LMUL",
OLO, 0, "LO",
OLS, 0, "LS",
OLSHR, 0, "LSHR",
OLT, 0, "LT",
OMOD, 0, "MOD",
OMUL, 0, "MUL",
ONAME, 0, "NAME",
ONE, 0, "NE",
ONOT, 0, "NOT",
OOR, 0, "OR",
OOROR, 0, "OROR",
OPOSTDEC, 0, "POSTDEC",
OPOSTINC, 0, "POSTINC",
OPREDEC, 0, "PREDEC",
OPREINC, 0, "PREINC",
OPROTO, 0, "PROTO",
OREGISTER, 0, "REGISTER",
ORETURN, 0, "RETURN",
OSET, 0, "SET",
OSIGN, 0, "SIGN",
OSIZE, 0, "SIZE",
OSTRING, 0, "STRING",
OLSTRING, 0, "LSTRING",
OSTRUCT, 0, "STRUCT",
OSUB, 0, "SUB",
OSWITCH, 0, "SWITCH",
OUNION, 0, "UNION",
OUSED, 0, "USED",
OWHILE, 0, "WHILE",
OXOR, 0, "XOR",
OPOS, 0, "POS",
ONEG, 0, "NEG",
OCOM, 0, "COM",
OELEM, 0, "ELEM",
OTST, 0, "TST",
OINDEX, 0, "INDEX",
OFAS, 0, "FAS",
OREGPAIR, 0, "REGPAIR",
OEXREG, 0, "EXREG",
OEND, 0, "END",
-1, 0, 0,
};
/* OEQ, ONE, OLE, OLS, OLT, OLO, OGE, OHS, OGT, OHI */
char comrel[12] =
{
ONE, OEQ, OGT, OHI, OGE, OHS, OLT, OLO, OLE, OLS,
};
char invrel[12] =
{
OEQ, ONE, OGE, OHS, OGT, OHI, OLE, OLS, OLT, OLO,
};
char logrel[12] =
{
OEQ, ONE, OLS, OLS, OLO, OLO, OHS, OHS, OHI, OHI,
};
char typei[NTYPE];
int typeiinit[] =
{
TCHAR, TUCHAR, TSHORT, TUSHORT, TINT, TUINT, TLONG, TULONG, TVLONG, TUVLONG, -1,
};
char typeu[NTYPE];
int typeuinit[] =
{
TUCHAR, TUSHORT, TUINT, TULONG, TUVLONG, TIND, -1,
};
char typesuv[NTYPE];
int typesuvinit[] =
{
TVLONG, TUVLONG, TSTRUCT, TUNION, -1,
};
char typeilp[NTYPE];
int typeilpinit[] =
{
TINT, TUINT, TLONG, TULONG, TIND, -1
};
char typechl[NTYPE];
char typechlv[NTYPE];
char typechlvp[NTYPE];
int typechlinit[] =
{
TCHAR, TUCHAR, TSHORT, TUSHORT, TINT, TUINT, TLONG, TULONG, -1,
};
char typechlp[NTYPE];
int typechlpinit[] =
{
TCHAR, TUCHAR, TSHORT, TUSHORT, TINT, TUINT, TLONG, TULONG, TIND, -1,
};
char typechlpfd[NTYPE];
int typechlpfdinit[] =
{
TCHAR, TUCHAR, TSHORT, TUSHORT, TINT, TUINT, TLONG, TULONG, TFLOAT, TDOUBLE, TIND, -1,
};
char typec[NTYPE];
int typecinit[] =
{
TCHAR, TUCHAR, -1
};
char typeh[NTYPE];
int typehinit[] =
{
TSHORT, TUSHORT, -1,
};
char typeil[NTYPE];
int typeilinit[] =
{
TINT, TUINT, TLONG, TULONG, -1,
};
char typev[NTYPE];
int typevinit[] =
{
TVLONG, TUVLONG, -1,
};
char typefd[NTYPE];
int typefdinit[] =
{
TFLOAT, TDOUBLE, -1,
};
char typeaf[NTYPE];
int typeafinit[] =
{
TFUNC, TARRAY, -1,
};
char typesu[NTYPE];
int typesuinit[] =
{
TSTRUCT, TUNION, -1,
};
long tasign[NTYPE];
Init tasigninit[] =
{
TCHAR, BNUMBER, 0,
TUCHAR, BNUMBER, 0,
TSHORT, BNUMBER, 0,
TUSHORT, BNUMBER, 0,
TINT, BNUMBER, 0,
TUINT, BNUMBER, 0,
TLONG, BNUMBER, 0,
TULONG, BNUMBER, 0,
TVLONG, BNUMBER, 0,
TUVLONG, BNUMBER, 0,
TFLOAT, BNUMBER, 0,
TDOUBLE, BNUMBER, 0,
TIND, BIND, 0,
TSTRUCT, BSTRUCT, 0,
TUNION, BUNION, 0,
-1, 0, 0,
};
long tasadd[NTYPE];
Init tasaddinit[] =
{
TCHAR, BNUMBER, 0,
TUCHAR, BNUMBER, 0,
TSHORT, BNUMBER, 0,
TUSHORT, BNUMBER, 0,
TINT, BNUMBER, 0,
TUINT, BNUMBER, 0,
TLONG, BNUMBER, 0,
TULONG, BNUMBER, 0,
TVLONG, BNUMBER, 0,
TUVLONG, BNUMBER, 0,
TFLOAT, BNUMBER, 0,
TDOUBLE, BNUMBER, 0,
TIND, BINTEGER, 0,
-1, 0, 0,
};
long tcast[NTYPE];
Init tcastinit[] =
{
TCHAR, BNUMBER|BIND|BVOID, 0,
TUCHAR, BNUMBER|BIND|BVOID, 0,
TSHORT, BNUMBER|BIND|BVOID, 0,
TUSHORT, BNUMBER|BIND|BVOID, 0,
TINT, BNUMBER|BIND|BVOID, 0,
TUINT, BNUMBER|BIND|BVOID, 0,
TLONG, BNUMBER|BIND|BVOID, 0,
TULONG, BNUMBER|BIND|BVOID, 0,
TVLONG, BNUMBER|BIND|BVOID, 0,
TUVLONG, BNUMBER|BIND|BVOID, 0,
TFLOAT, BNUMBER|BVOID, 0,
TDOUBLE, BNUMBER|BVOID, 0,
TIND, BINTEGER|BIND|BVOID, 0,
TVOID, BVOID, 0,
TSTRUCT, BSTRUCT|BVOID, 0,
TUNION, BUNION|BVOID, 0,
-1, 0, 0,
};
long tadd[NTYPE];
Init taddinit[] =
{
TCHAR, BNUMBER|BIND, 0,
TUCHAR, BNUMBER|BIND, 0,
TSHORT, BNUMBER|BIND, 0,
TUSHORT, BNUMBER|BIND, 0,
TINT, BNUMBER|BIND, 0,
TUINT, BNUMBER|BIND, 0,
TLONG, BNUMBER|BIND, 0,
TULONG, BNUMBER|BIND, 0,
TVLONG, BNUMBER|BIND, 0,
TUVLONG, BNUMBER|BIND, 0,
TFLOAT, BNUMBER, 0,
TDOUBLE, BNUMBER, 0,
TIND, BINTEGER, 0,
-1, 0, 0,
};
long tsub[NTYPE];
Init tsubinit[] =
{
TCHAR, BNUMBER, 0,
TUCHAR, BNUMBER, 0,
TSHORT, BNUMBER, 0,
TUSHORT, BNUMBER, 0,
TINT, BNUMBER, 0,
TUINT, BNUMBER, 0,
TLONG, BNUMBER, 0,
TULONG, BNUMBER, 0,
TVLONG, BNUMBER, 0,
TUVLONG, BNUMBER, 0,
TFLOAT, BNUMBER, 0,
TDOUBLE, BNUMBER, 0,
TIND, BINTEGER|BIND, 0,
-1, 0, 0,
};
long tmul[NTYPE];
Init tmulinit[] =
{
TCHAR, BNUMBER, 0,
TUCHAR, BNUMBER, 0,
TSHORT, BNUMBER, 0,
TUSHORT, BNUMBER, 0,
TINT, BNUMBER, 0,
TUINT, BNUMBER, 0,
TLONG, BNUMBER, 0,
TULONG, BNUMBER, 0,
TVLONG, BNUMBER, 0,
TUVLONG, BNUMBER, 0,
TFLOAT, BNUMBER, 0,
TDOUBLE, BNUMBER, 0,
-1, 0, 0,
};
long tand[NTYPE];
Init tandinit[] =
{
TCHAR, BINTEGER, 0,
TUCHAR, BINTEGER, 0,
TSHORT, BINTEGER, 0,
TUSHORT, BINTEGER, 0,
TINT, BNUMBER, 0,
TUINT, BNUMBER, 0,
TLONG, BINTEGER, 0,
TULONG, BINTEGER, 0,
TVLONG, BINTEGER, 0,
TUVLONG, BINTEGER, 0,
-1, 0, 0,
};
long trel[NTYPE];
Init trelinit[] =
{
TCHAR, BNUMBER, 0,
TUCHAR, BNUMBER, 0,
TSHORT, BNUMBER, 0,
TUSHORT, BNUMBER, 0,
TINT, BNUMBER, 0,
TUINT, BNUMBER, 0,
TLONG, BNUMBER, 0,
TULONG, BNUMBER, 0,
TVLONG, BNUMBER, 0,
TUVLONG, BNUMBER, 0,
TFLOAT, BNUMBER, 0,
TDOUBLE, BNUMBER, 0,
TIND, BIND, 0,
-1, 0, 0,
};
long tfunct[1] =
{
BFUNC,
};
long tindir[1] =
{
BIND,
};
long tdot[1] =
{
BSTRUCT|BUNION,
};
long tnot[1] =
{
BNUMBER|BIND,
};
long targ[1] =
{
BNUMBER|BIND|BSTRUCT|BUNION,
};
char tab[NTYPE][NTYPE] =
{
/*TXXX*/ { 0,
},
/*TCHAR*/ { 0, TCHAR, TUCHAR, TSHORT, TUSHORT, TINT, TUINT, TLONG,
TULONG, TVLONG, TUVLONG, TFLOAT, TDOUBLE, TIND,
},
/*TUCHAR*/ { 0, TUCHAR, TUCHAR, TUSHORT, TUSHORT, TUINT, TUINT, TULONG,
TULONG, TUVLONG, TUVLONG, TFLOAT, TDOUBLE, TIND,
},
/*TSHORT*/ { 0, TSHORT, TUSHORT, TSHORT, TUSHORT, TINT, TUINT, TLONG,
TULONG, TVLONG, TUVLONG, TFLOAT, TDOUBLE, TIND,
},
/*TUSHORT*/ { 0, TUSHORT, TUSHORT, TUSHORT, TUSHORT, TUINT, TUINT, TULONG,
TULONG, TUVLONG, TUVLONG, TFLOAT, TDOUBLE, TIND,
},
/*TINT*/ { 0, TINT, TUINT, TINT, TUINT, TINT, TUINT, TLONG,
TULONG, TVLONG, TUVLONG, TFLOAT, TDOUBLE, TIND,
},
/*TUINT*/ { 0, TUINT, TUINT, TUINT, TUINT, TUINT, TUINT, TULONG,
TULONG, TUVLONG, TUVLONG, TFLOAT, TDOUBLE, TIND,
},
/*TLONG*/ { 0, TLONG, TULONG, TLONG, TULONG, TLONG, TULONG, TLONG,
TULONG, TVLONG, TUVLONG, TFLOAT, TDOUBLE, TIND,
},
/*TULONG*/ { 0, TULONG, TULONG, TULONG, TULONG, TULONG, TULONG, TULONG,
TULONG, TUVLONG, TUVLONG, TFLOAT, TDOUBLE, TIND,
},
/*TVLONG*/ { 0, TVLONG, TUVLONG, TVLONG, TUVLONG, TVLONG, TUVLONG, TVLONG,
TUVLONG, TVLONG, TUVLONG, TFLOAT, TDOUBLE, TIND,
},
/*TUVLONG*/ { 0, TUVLONG, TUVLONG, TUVLONG, TUVLONG, TUVLONG, TUVLONG, TUVLONG,
TUVLONG, TUVLONG, TUVLONG, TFLOAT, TDOUBLE, TIND,
},
/*TFLOAT*/ { 0, TFLOAT, TFLOAT, TFLOAT, TFLOAT, TFLOAT, TFLOAT, TFLOAT,
TFLOAT, TFLOAT, TFLOAT, TFLOAT, TDOUBLE, TIND,
},
/*TDOUBLE*/ { 0, TDOUBLE, TDOUBLE, TDOUBLE, TDOUBLE, TDOUBLE, TDOUBLE, TDOUBLE,
TDOUBLE, TDOUBLE, TDOUBLE, TFLOAT, TDOUBLE, TIND,
},
/*TIND*/ { 0, TIND, TIND, TIND, TIND, TIND, TIND, TIND,
TIND, TIND, TIND, TIND, TIND, TIND,
},
};
void
urk(char *name, int max, int i)
{
if(i >= max) {
fprint(2, "bad tinit: %s %d>=%d\n", name, i, max);
exits("init");
}
}
void
tinit(void)
{
int *ip;
Init *p;
for(p=thashinit; p->code >= 0; p++) {
urk("thash", nelem(thash), p->code);
thash[p->code] = p->value;
}
for(p=bnamesinit; p->code >= 0; p++) {
urk("bnames", nelem(bnames), p->code);
bnames[p->code] = p->s;
}
for(p=tnamesinit; p->code >= 0; p++) {
urk("tnames", nelem(tnames), p->code);
tnames[p->code] = p->s;
}
for(p=gnamesinit; p->code >= 0; p++) {
urk("gnames", nelem(gnames), p->code);
gnames[p->code] = p->s;
}
for(p=qnamesinit; p->code >= 0; p++) {
urk("qnames", nelem(qnames), p->code);
qnames[p->code] = p->s;
}
for(p=cnamesinit; p->code >= 0; p++) {
urk("cnames", nelem(cnames), p->code);
cnames[p->code] = p->s;
}
for(p=onamesinit; p->code >= 0; p++) {
urk("onames", nelem(onames), p->code);
onames[p->code] = p->s;
}
for(ip=typeiinit; *ip>=0; ip++) {
urk("typei", nelem(typei), *ip);
typei[*ip] = 1;
}
for(ip=typeuinit; *ip>=0; ip++) {
urk("typeu", nelem(typeu), *ip);
typeu[*ip] = 1;
}
for(ip=typesuvinit; *ip>=0; ip++) {
urk("typesuv", nelem(typesuv), *ip);
typesuv[*ip] = 1;
}
for(ip=typeilpinit; *ip>=0; ip++) {
urk("typeilp", nelem(typeilp), *ip);
typeilp[*ip] = 1;
}
for(ip=typechlinit; *ip>=0; ip++) {
urk("typechl", nelem(typechl), *ip);
typechl[*ip] = 1;
typechlv[*ip] = 1;
typechlvp[*ip] = 1;
}
for(ip=typechlpinit; *ip>=0; ip++) {
urk("typechlp", nelem(typechlp), *ip);
typechlp[*ip] = 1;
typechlvp[*ip] = 1;
}
for(ip=typechlpfdinit; *ip>=0; ip++) {
urk("typechlpfd", nelem(typechlpfd), *ip);
typechlpfd[*ip] = 1;
}
for(ip=typecinit; *ip>=0; ip++) {
urk("typec", nelem(typec), *ip);
typec[*ip] = 1;
}
for(ip=typehinit; *ip>=0; ip++) {
urk("typeh", nelem(typeh), *ip);
typeh[*ip] = 1;
}
for(ip=typeilinit; *ip>=0; ip++) {
urk("typeil", nelem(typeil), *ip);
typeil[*ip] = 1;
}
for(ip=typevinit; *ip>=0; ip++) {
urk("typev", nelem(typev), *ip);
typev[*ip] = 1;
typechlv[*ip] = 1;
typechlvp[*ip] = 1;
}
for(ip=typefdinit; *ip>=0; ip++) {
urk("typefd", nelem(typefd), *ip);
typefd[*ip] = 1;
}
for(ip=typeafinit; *ip>=0; ip++) {
urk("typeaf", nelem(typeaf), *ip);
typeaf[*ip] = 1;
}
for(ip=typesuinit; *ip >= 0; ip++) {
urk("typesu", nelem(typesu), *ip);
typesu[*ip] = 1;
}
for(p=tasigninit; p->code >= 0; p++) {
urk("tasign", nelem(tasign), p->code);
tasign[p->code] = p->value;
}
for(p=tasaddinit; p->code >= 0; p++) {
urk("tasadd", nelem(tasadd), p->code);
tasadd[p->code] = p->value;
}
for(p=tcastinit; p->code >= 0; p++) {
urk("tcast", nelem(tcast), p->code);
tcast[p->code] = p->value;
}
for(p=taddinit; p->code >= 0; p++) {
urk("tadd", nelem(tadd), p->code);
tadd[p->code] = p->value;
}
for(p=tsubinit; p->code >= 0; p++) {
urk("tsub", nelem(tsub), p->code);
tsub[p->code] = p->value;
}
for(p=tmulinit; p->code >= 0; p++) {
urk("tmul", nelem(tmul), p->code);
tmul[p->code] = p->value;
}
for(p=tandinit; p->code >= 0; p++) {
urk("tand", nelem(tand), p->code);
tand[p->code] = p->value;
}
for(p=trelinit; p->code >= 0; p++) {
urk("trel", nelem(trel), p->code);
trel[p->code] = p->value;
}
/* 32-bit defaults */
typeword = typechlp;
typeswitch = typechl;
typecmplx = typesuv;
}
/*
* return 1 if it is impossible to jump into the middle of n.
*/
static int
deadhead(Node *n, int caseok)
{
loop:
if(n == Z)
return 1;
switch(n->op) {
case OLIST:
if(!deadhead(n->left, caseok))
return 0;
rloop:
n = n->right;
goto loop;
case ORETURN:
break;
case OLABEL:
return 0;
case OGOTO:
break;
case OCASE:
if(!caseok)
return 0;
goto rloop;
case OSWITCH:
return deadhead(n->right, 1);
case OWHILE:
case ODWHILE:
goto rloop;
case OFOR:
goto rloop;
case OCONTINUE:
break;
case OBREAK:
break;
case OIF:
return deadhead(n->right->left, caseok) && deadhead(n->right->right, caseok);
case OSET:
case OUSED:
break;
}
return 1;
}
int
deadheads(Node *c)
{
return deadhead(c->left, 0) && deadhead(c->right, 0);
}
int
mixedasop(Type *l, Type *r)
{
return !typefd[l->etype] && typefd[r->etype];
}