ref: c44aabebe17d7bc8e6173e2b3d1a6e7b4f5edaf5
dir: /utils/c2l/com.c/
#include "cc.h"
void
complex(Node *n)
{
if(n == Z)
return;
nearln = n->lineno;
if(tcom(n))
return;
ccom(n);
acom(n);
}
/*
* evaluate types
* evaluate lvalues (addable == 1)
*/
enum
{
ADDROF = 1<<0,
CASTOF = 1<<1,
ADDROP = 1<<2,
};
int
tcom(Node *n)
{
return tcomo(n, ADDROF);
}
int
tcomo(Node *n, int f)
{
Node *l, *r;
Type *t;
int o;
if(n == Z) {
diag(Z, "Z in tcom");
errorexit();
}
l = n->left;
r = n->right;
switch(n->op) {
default:
diag(n, "unknown op in type complex: %O", n->op);
goto bad;
case ODOTDOT:
/*
* tcom has already been called on this subtree
*/
*n = *n->left;
if(n->type == T)
goto bad;
break;
case OCAST:
if(n->type == T)
break;
if(n->type->width == types[TLONG]->width) {
if(tcomo(l, ADDROF|CASTOF))
goto bad;
} else
if(tcom(l))
goto bad;
if(tcompat(n, l->type, n->type, tcast))
goto bad;
break;
case ORETURN:
if(l == Z) {
if(n->type->etype != TVOID)
warn(n, "null return of a typed function");
break;
}
if(tcom(l))
goto bad;
typeext(n->type, l);
if(tcompat(n, n->type, l->type, tasign))
break;
constas(n, n->type, l->type);
if(!sametype(n->type, l->type)) {
l = new1(OCAST, l, Z);
l->type = n->type;
n->left = l;
}
break;
case OASI: /* same as as, but no test for const */
n->op = OAS;
o = tcom(l);
if(o | tcom(r))
goto bad;
typeext(l->type, r);
if(tlvalue(l) || tcompat(n, l->type, r->type, tasign))
goto bad;
if(!sametype(l->type, r->type)) {
r = new1(OCAST, r, Z);
r->type = l->type;
n->right = r;
}
n->type = l->type;
break;
case OAS:
case OASD:
o = tcom(l);
if(o | tcom(r))
goto bad;
typeext(l->type, r);
if(tlvalue(l) || tcompat(n, l->type, r->type, tasign))
goto bad;
constas(n, l->type, r->type);
if(!sametype(l->type, r->type)) {
r = new1(OCAST, r, Z);
r->type = l->type;
n->right = r;
}
n->type = l->type;
break;
case OASADD:
case OASSUB:
o = tcom(l);
if(o | tcom(r))
goto bad;
typeext1(l->type, r);
if(tlvalue(l) || tcompat(n, l->type, r->type, tasadd))
goto bad;
constas(n, l->type, r->type);
t = l->type;
arith(n, 0);
while(n->left->op == OCAST)
n->left = n->left->left;
if(!sametype(t, n->type)) {
r = new1(OCAST, n->right, Z);
r->type = t;
n->right = r;
n->type = t;
}
break;
case OASMUL:
case OASLMUL:
case OASDIV:
case OASLDIV:
o = tcom(l);
if(o | tcom(r))
goto bad;
typeext1(l->type, r);
if(tlvalue(l) || tcompat(n, l->type, r->type, tmul))
goto bad;
constas(n, l->type, r->type);
t = l->type;
arith(n, 0);
while(n->left->op == OCAST)
n->left = n->left->left;
if(!sametype(t, n->type)) {
r = new1(OCAST, n->right, Z);
r->type = t;
n->right = r;
n->type = t;
}
if(typeu[n->type->etype]) {
if(n->op == OASDIV)
n->op = OASLDIV;
if(n->op == OASMUL)
n->op = OASLMUL;
}
break;
case OASLSHR:
case OASASHR:
case OASASHL:
o = tcom(l);
if(o | tcom(r))
goto bad;
if(tlvalue(l) || tcompat(n, l->type, r->type, tand))
goto bad;
n->type = l->type;
if(typeu[n->type->etype]) {
if(n->op == OASASHR)
n->op = OASLSHR;
}
break;
case OASMOD:
case OASLMOD:
case OASOR:
case OASAND:
case OASXOR:
o = tcom(l);
if(o | tcom(r))
goto bad;
if(tlvalue(l) || tcompat(n, l->type, r->type, tand))
goto bad;
t = l->type;
arith(n, 0);
while(n->left->op == OCAST)
n->left = n->left->left;
if(!sametype(t, n->type)) {
r = new1(OCAST, n->right, Z);
r->type = t;
n->right = r;
n->type = t;
}
if(typeu[n->type->etype]) {
if(n->op == OASMOD)
n->op = OASLMOD;
}
break;
case OPREINC:
case OPREDEC:
case OPOSTINC:
case OPOSTDEC:
if(tcom(l))
goto bad;
if(tlvalue(l) || tcompat(n, l->type, types[TINT], tadd))
goto bad;
n->type = l->type;
if(n->type->etype == TIND)
if(n->type->link->width < 1)
diag(n, "inc/dec of a void pointer");
break;
case OEQ:
case ONE:
o = tcom(l);
if(o | tcom(r))
goto bad;
typeext(l->type, r);
typeext(r->type, l);
if(tcompat(n, l->type, r->type, trel))
goto bad;
arith(n, 0);
n->type = types[TINT];
break;
case OLT:
case OGE:
case OGT:
case OLE:
o = tcom(l);
if(o | tcom(r))
goto bad;
typeext1(l->type, r);
typeext1(r->type, l);
if(tcompat(n, l->type, r->type, trel))
goto bad;
arith(n, 0);
if(typeu[n->type->etype])
n->op = logrel[relindex(n->op)];
n->type = types[TINT];
break;
case OCOND:
o = tcom(l);
o |= tcom(r->left);
if(o | tcom(r->right))
goto bad;
if(r->right->type->etype == TIND && vconst(r->left) == 0) {
r->left->type = r->right->type;
r->left->vconst = 0;
}
if(r->left->type->etype == TIND && vconst(r->right) == 0) {
r->right->type = r->left->type;
r->right->vconst = 0;
}
if(sametype(r->right->type, r->left->type)) {
r->type = r->right->type;
n->type = r->type;
break;
}
if(tcompat(r, r->left->type, r->right->type, trel))
goto bad;
arith(r, 0);
n->type = r->type;
break;
case OADD:
o = tcom(l);
if(o | tcom(r))
goto bad;
if(tcompat(n, l->type, r->type, tadd))
goto bad;
arith(n, 1);
break;
case OSUB:
o = tcom(l);
if(o | tcom(r))
goto bad;
if(tcompat(n, l->type, r->type, tsub))
goto bad;
arith(n, 1);
break;
case OMUL:
case OLMUL:
case ODIV:
case OLDIV:
o = tcom(l);
if(o | tcom(r))
goto bad;
if(tcompat(n, l->type, r->type, tmul))
goto bad;
arith(n, 1);
if(typeu[n->type->etype]) {
if(n->op == ODIV)
n->op = OLDIV;
if(n->op == OMUL)
n->op = OLMUL;
}
break;
case OLSHR:
case OASHL:
case OASHR:
o = tcom(l);
if(o | tcom(r))
goto bad;
if(tcompat(n, l->type, r->type, tand))
goto bad;
n->right = Z;
arith(n, 1);
n->right = new1(OCAST, r, Z);
n->right->type = types[TINT];
if(typeu[n->type->etype])
if(n->op == OASHR)
n->op = OLSHR;
break;
case OAND:
case OOR:
case OXOR:
o = tcom(l);
if(o | tcom(r))
goto bad;
if(tcompat(n, l->type, r->type, tand))
goto bad;
arith(n, 1);
break;
case OMOD:
case OLMOD:
o = tcom(l);
if(o | tcom(r))
goto bad;
if(tcompat(n, l->type, r->type, tand))
goto bad;
arith(n, 1);
if(typeu[n->type->etype])
n->op = OLMOD;
break;
case ONOT:
if(tcom(l))
goto bad;
if(tcompat(n, T, l->type, tnot))
goto bad;
n->type = types[TINT];
break;
case OPOS:
case ONEG:
case OCOM:
if(tcom(l))
goto bad;
n->type = l->type;
break;
case ONUL:
break;
case OIOTA:
n->type = types[TINT];
break;
case ODAS:
n->type = n->left->type;
break;
case OANDAND:
case OOROR:
o = tcom(l);
if(o | tcom(r))
goto bad;
if(tcompat(n, T, l->type, tnot) |
tcompat(n, T, r->type, tnot))
goto bad;
n->type = types[TINT];
break;
case OCOMMA:
o = tcom(l);
if(o | tcom(r))
goto bad;
n->type = r->type;
break;
case OSIGN: /* extension signof(type) returns a hash */
if(l != Z) {
if(l->op != OSTRING && l->op != OLSTRING)
if(tcomo(l, 0))
goto bad;
if(l->op == OBIT) {
diag(n, "signof bitfield");
goto bad;
}
n->type = l->type;
}
if(n->type == T)
goto bad;
if(n->type->width < 0) {
diag(n, "signof undefined type");
goto bad;
}
n->right = ncopy(n);
n->op = OCONST;
n->left = Z;
/* n->right = Z; */
n->vconst = convvtox(signature(n->type, 10), TULONG);
n->type = types[TULONG];
break;
case OSIZE:
if(l != Z) {
if(l->op != OSTRING && l->op != OLSTRING)
if(tcomo(l, 0))
goto bad;
if(l->op == OBIT) {
diag(n, "sizeof bitfield");
goto bad;
}
n->type = l->type;
}
if(n->type == T)
goto bad;
if(n->type->width <= 0) {
diag(n, "sizeof undefined type");
goto bad;
}
if(n->type->etype == TFUNC) {
diag(n, "sizeof function");
goto bad;
}
n->right = ncopy(n);
n->op = OCONST;
n->left = Z;
/* n->right = Z; */
n->vconst = convvtox(n->type->width, TINT);
n->type = types[TINT];
break;
case OFUNC:
o = tcomo(l, 0);
if(o)
goto bad;
if(l->type->etype == TIND && l->type->link->etype == TFUNC) {
l = new1(OIND, l, Z);
l->type = l->left->type->link;
n->left = l;
}
if(tcompat(n, T, l->type, tfunct))
goto bad;
if(o | tcoma(l, r, l->type->down, 1))
goto bad;
n->type = l->type->link;
if(1)
if(l->type->down == T || l->type->down->etype == TOLD) {
nerrors--;
diag(n, "function args not checked: %F", l);
}
dpcheck(n);
break;
case ONAME:
if(n->type == T) {
diag(n, "name not declared: %F", n);
goto bad;
}
if(n->type->etype == TENUM) {
if(n->sym->tenum->etype == TIND){
/* n->op = OSTRING; */
n->type = n->sym->tenum;
/* n->cstring = n->sym->sconst; */
break;
}
n->left = ncopy(n);
n->op = OCONST;
n->type = n->sym->tenum;
if(!typefd[n->type->etype])
n->vconst = n->sym->vconst;
else{
n->fconst = n->sym->fconst;
n->cstring = n->sym->cstring;
}
break;
}
break;
case OLSTRING:
case OSTRING:
case OCONST:
break;
case ODOT:
if(tcom(l))
goto bad;
if(tcompat(n, T, l->type, tdot))
goto bad;
if(tcomd(n, l->type))
goto bad;
break;
case ODOTIND:
if(tcom(l))
goto bad;
if(tcompat(n, T, l->type, tindir))
goto bad;
if(tcompat(n, T, l->type->link, tdot))
goto bad;
if(tcomd(n, l->type->link))
goto bad;
break;
case OARRIND:
if(tcom(l))
goto bad;
if(tcompat(n, T, l->type, tindir))
goto bad;
n->type = l->type->link;
if(tcom(r))
goto bad;
break;
case OADDR:
if(tcomo(l, ADDROP))
goto bad;
if(tlvalue(l))
goto bad;
if(l->type->nbits) {
diag(n, "address of a bit field");
goto bad;
}
if(l->op == OREGISTER) {
diag(n, "address of a register");
goto bad;
}
n->type = typ1(TIND, l->type);
n->type->width = types[TIND]->width;
break;
case OIND:
if(tcom(l))
goto bad;
if(tcompat(n, T, l->type, tindir))
goto bad;
n->type = l->type->link;
break;
case OSTRUCT:
if(tcomx(n))
goto bad;
break;
}
t = n->type;
if(t == T)
goto bad;
if(t->width < 0) {
snap(t);
if(t->width < 0) {
if(typesu[t->etype] && t->tag)
diag(n, "structure not fully declared %s", t->tag->name);
else
diag(n, "structure not fully declared");
goto bad;
}
}
if(typeaf[t->etype]) {
if(f & ADDROF)
goto addaddr;
if(f & ADDROP)
warn(n, "address of array/func ignored");
}
return 0;
addaddr:
if(n->type->etype == TARRAY)
n->type = typ1(TIND, n->type->link);
return 0;
#ifdef WHATEVA
if(tlvalue(n))
goto bad;
l = new1(OXXX, Z, Z);
*l = *n;
n->op = OADDR;
if(l->type->etype == TARRAY)
l->type = l->type->link;
n->left = l;
n->right = Z;
n->type = typ1(TIND, l->type);
n->type->width = types[TIND]->width;
return 0;
#endif
bad:
n->type = T;
return 1;
}
int
tcoma(Node *l, Node *n, Type *t, int f)
{
Node *n1;
int o;
if(t != T)
if(t->etype == TOLD || t->etype == TDOT) /* .../old in prototype */
t = T;
if(n == Z) {
if(t != T && !sametype(t, types[TVOID])) {
diag(n, "not enough function arguments: %F", l);
return 1;
}
return 0;
}
if(n->op == OLIST) {
o = tcoma(l, n->left, t, 0);
if(t != T) {
t = t->down;
if(t == T)
t = types[TVOID];
}
return o | tcoma(l, n->right, t, 1);
}
if(f && t != T)
tcoma(l, Z, t->down, 0);
if(tcom(n) || tcompat(n, T, n->type, targ))
return 1;
if(sametype(t, types[TVOID])) {
diag(n, "too many function arguments: %F", l);
return 1;
}
if(t != T) {
typeext(t, n);
if(stcompat(nodproto, t, n->type, tasign)) {
diag(l, "argument prototype mismatch \"%T\" for \"%T\": %F",
n->type, t, l);
return 1;
}
switch(t->etype) {
case TCHAR:
case TSHORT:
/* t = types[TINT]; */
break;
case TUCHAR:
case TUSHORT:
/* t = types[TUINT]; */
break;
}
} else {
switch(n->type->etype)
{
case TCHAR:
case TSHORT:
/* t = types[TINT]; */
t = n->type;
break;
case TUCHAR:
case TUSHORT:
/* t = types[TUINT]; */
t = n->type;
break;
case TFLOAT:
/* t = types[TDOUBLE]; */
t = n->type;
}
}
if(t != T && !sametype(t, n->type)) {
n1 = new1(OXXX, Z, Z);
*n1 = *n;
n->op = OCAST;
n->left = n1;
n->right = Z;
n->type = t;
}
return 0;
}
int
tcomd(Node *n, Type *t)
{
long o;
o = 0;
/* t = n->left->type; */
for(;;) {
t = dotsearch(n->sym, t->link, n);
if(t == T) {
diag(n, "not a member of struct/union: %F", n);
return 1;
}
o += t->offset;
if(t->sym == n->sym)
break;
if(sametype(t, n->sym->type))
break;
}
n->type = t;
return 0;
}
int
tcomx(Node *n)
{
Type *t;
Node *l, *r, **ar, **al;
int e;
e = 0;
if(n->type->etype != TSTRUCT) {
diag(n, "constructor must be a structure");
return 1;
}
l = invert(n->left);
n->left = l;
al = &n->left;
for(t = n->type->link; t != T; t = t->down) {
if(l == Z) {
diag(n, "constructor list too short");
return 1;
}
if(l->op == OLIST) {
r = l->left;
ar = &l->left;
al = &l->right;
l = l->right;
} else {
r = l;
ar = al;
l = Z;
}
if(tcom(r))
e++;
typeext(t, r);
if(tcompat(n, t, r->type, tasign))
e++;
constas(n, t, r->type);
if(!e && !sametype(t, r->type)) {
r = new1(OCAST, r, Z);
r->type = t;
*ar = r;
}
}
if(l != Z) {
diag(n, "constructor list too long");
return 1;
}
return e;
}
int
tlvalue(Node *n)
{
if(0) {
diag(n, "not an l-value");
return 1;
}
return 0;
}
/*
* general rewrite
* (IND(ADDR x)) ==> x
* (ADDR(IND x)) ==> x
* remove some zero operands
* remove no op casts
* evaluate constants
*/
void
ccom(Node *n)
{
Node *l, *r;
int t;
if(n == Z)
return;
l = n->left;
r = n->right;
switch(n->op) {
case OAS:
case OASD:
case OASXOR:
case OASAND:
case OASOR:
case OASMOD:
case OASLMOD:
case OASLSHR:
case OASASHR:
case OASASHL:
case OASDIV:
case OASLDIV:
case OASMUL:
case OASLMUL:
case OASSUB:
case OASADD:
ccom(l);
ccom(r);
if(n->op == OASLSHR || n->op == OASASHR || n->op == OASASHL)
if(r->op == OCONST) {
t = n->type->width * 8; /* bits per byte */
if(r->vconst >= t || r->vconst < 0)
warn(n, "stupid shift: %lld", r->vconst);
}
break;
case OCAST:
ccom(l);
if(l->op == OCONST) {
evconst(n);
if(n->op == OCONST)
break;
}
if(nocast(l->type, n->type)) {
l->type = n->type;
*n = *l;
}
break;
case OCOND:
ccom(l);
ccom(r);
break;
case OREGISTER:
case OINDREG:
case OCONST:
case ONAME:
break;
case OADDR:
ccom(l);
/* l->etype = TVOID; */
if(l->op == OIND) {
l->left->type = n->type;
*n = *l->left;
break;
}
goto common;
case OIND:
ccom(l);
if(l->op == OADDR) {
l->left->type = n->type;
*n = *l->left;
break;
}
goto common;
case OEQ:
case ONE:
case OLE:
case OGE:
case OLT:
case OGT:
case OLS:
case OHS:
case OLO:
case OHI:
ccom(l);
ccom(r);
relcon(l, r);
relcon(r, l);
goto common;
case OASHR:
case OASHL:
case OLSHR:
ccom(l);
ccom(r);
if(r->op == OCONST) {
t = n->type->width * 8; /* bits per byte */
if(r->vconst >= t || r->vconst <= -t)
warn(n, "stupid shift: %lld", r->vconst);
}
goto common;
default:
if(l != Z)
ccom(l);
if(r != Z)
ccom(r);
common:
if(l != Z)
if(l->op != OCONST)
break;
if(r != Z)
if(r->op != OCONST)
break;
evconst(n);
}
}