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typechk.c
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typechk.c
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#include "cc.h"
enum {
ADDROF = 1 << 0,
ADDROP = 1 << 1,
};
static int vconst(struct node *p)
{
int i;
if (p == NULL)
goto bad;
if (p->op != OCONST)
goto bad;
if (p->type == NULL)
goto bad;
switch (p->type->etype) {
case TBOOL:
case TCHAR:
case TUCHAR:
case TSHORT:
case TUSHORT:
case TINT:
case TUINT:
case TLONG:
case TULONG:
case TLLONG:
case TULLONG:
case TPTR:
case TENUM:
i = p->v.i; /* downcast */
if (i != p->v.i)
goto bad;
return i;
case TFLOAT:
case TDOUBLE:
i = p->v.d;
if (i != p->v.d) /* round */
goto bad;
return i;
}
bad:
return -666; /* any value except 0,1 */
}
int vbconst(struct node *p)
{
if (p == NULL)
goto bad;
if (p->op == OADDR)
return 1;
if (p->op != OCONST)
goto bad;
if (typefd[p->type->etype])
return p->v.d != 0;
return p->v.i != 0;
bad:
return -666; /* any value except 0,1 */
}
static int nullptr_p(struct node *p)
{
if (p == NULL || p->type == NULL)
return 0;
if (p->type->etype != TPTR && !typei[p->type->etype])
return 0;
while (p->op == OCAST)
p = p->left;
return vconst(p) == 0;
}
static int tlvalue(struct node *p)
{
if (!p->addable) {
error(p, "not an lvalue");
return 1;
}
return 0;
}
static int stcompat(struct node *p, struct type *ty1, struct type *ty2, int ttab[])
{
int i, b;
i = 0;
if (ty2)
i = ty2->etype;
b = 1 << i;
i = 0;
if (ty1)
i = ty1->etype;
if (b & ttab[i]) {
if (ttab == tcast || ttab == tasgn)
if (b == BSTRUCT || b == BUNION)
if (!eqtype(ty1, ty2, 1))
return 1;
if (p->op != OCAST)
if (b == BPTR && i == TPTR)
if (!eqtype(ty1, ty2, 1))
return 1;
return 0;
}
return 1;
}
int tcompat(struct node *p, struct type *ty1, struct type *ty2, int ttab[])
{
if (stcompat(p, ty1, ty2, ttab)) {
if (ty1 == NULL)
error(p, "incompatible type '%T' for op '%O'", ty2, p->op);
else
error(p, "incompatible types '%T' and '%T' for op '%O'", ty1, ty2, p->op);
return 1;
}
return 0;
}
/* universal binary conversion */
static void arith(struct node *p)
{
struct type *ty1, *ty2;
struct node *q;
int i, j, k;
long size;
ty1 = p->left->type;
if (p->right)
ty2 = p->right->type;
else
ty2 = ty1;
if (ty1 && ty1->etype == TENUM)
ty1 = ty1->link;
if (ty2 && ty2->etype == TENUM)
ty2 = ty2->link;
i = TXXX;
if (ty1)
i = ty1->etype;
j = TXXX;
if (ty2)
j = ty2->etype;
k = tab[i][j];
if (k == TPTR) {
if (i == TPTR)
p->type = ty1;
else if (j == TPTR)
p->type = ty2;
} else {
p->type = types[k];
/* promote to int */
if (typei[p->type->etype] && p->type->size < types[TINT]->size)
p->type = types[TINT];
}
if (p->op == OSUB)
if (i == TPTR && j == TPTR) {
size = p->right->type->link->size;
if (size < 1 || p->left->type->link->size < 1)
goto bad;
p->type = types[typsize[TPTR] <= typsize[TLONG] ? TLONG : TLLONG];
if (typsize[TPTR] > typsize[TLONG]) {
q = node(OXXX, NULL, NULL);
*q = *p;
p->op = OCAST;
p->left = q;
p->right = NULL;
p->type = types[TLONG];
}
if (size > 1) {
q = node(OXXX, NULL, NULL);
*q = *p;
p->op = ODIV;
p->left = q;
q = node1(OCONST, NULL, NULL);
q->v.i = size;
q->type = p->type;
p->right = q;
size = log2i(size);
if (size >= 0) {
p->op = OSHR;
q->v.i = size;
}
}
return;
}
if (!eqtype(p->type, p->left->type, 1)) {
p->left = node(OCAST, p->left, NULL);
p->left->type = p->type;
if (p->type->etype == TPTR) {
size = p->type->link->size;
if (size < 1)
goto bad;
if (size > 1) {
q = node1(OCONST, NULL, NULL);
q->v.i = size;
q->type = p->type;
p->left = node(OMUL, p->left, q);
p->left->type = p->type;
}
}
}
if (p->right)
if (!eqtype(p->type, p->right->type, 1)) {
p->right = node(OCAST, p->right, NULL);
p->right->type = p->type;
if (p->type->etype == TPTR) {
size = p->type->link->size;
if (size < 1)
goto bad;
if (size > 1) {
q = node1(OCONST, NULL, NULL);
q->v.i = size;
q->type = p->type;
p->right = node(OMUL, p->right, q);
p->right->type = p->type;
}
}
}
return;
bad:
error(p, "pointer addition to incomplete type: '%T'", p->type->link);
}
static void typext(struct type *ty, struct node *p, int f)
{
struct node *q;
if (ty->etype == TPTR && typei[p->type->etype])
goto cast;
if (f)
if (ty->etype == TPTR && p->type->etype == TPTR)
goto cast;
return;
cast:
q = node(OXXX, NULL, NULL);
*q = *p;
p->op = OCAST;
p->type = ty;
p->left = q;
p->right = NULL;
p->addable = 0;
}
static void makedot(struct node *p, struct type *ty, long o)
{
struct node *p1, *p2;
if (ty->nbits) {
p1 = node(OXXX, NULL, NULL);
*p1 = *p;
p->op = OBIT;
p->left = p1;
p->right = NULL;
p->type = ty;
p->addable = p1->left->addable;
p = p1;
}
p->addable = p->left->addable;
if (p->addable == 0) {
p1 = node1(OCONST, NULL, NULL);
p1->v.i = o;
p1->type = types[TLONG];
p->right = p1;
p->type = ty;
return;
}
p->left->type = ty;
if (o == 0) {
*p = *p->left;
return;
}
/* left.x/left->x => *(&left + offset) */
p->type = ty;
ty = ptrtyp(ty);
p1 = node(OADDR, p->left, NULL);
p1->type = ty;
p2 = node1(OCONST, NULL, NULL);
p2->v.i = o;
p2->type = ty;
p1 = node(OADD, p1, p2);
p1->type = ty;
p->op = OINDIR;
p->left = p1;
p->right = NULL;
}
/* convert dot */
static int tconvd(struct node *p)
{
struct type *ty;
long o;
if (p->sym == NULL)
return 1;
o = 0;
ty = find_field(p->sym, p->left->type->link, &o);
if (ty == NULL) {
error(p, "field '%s' not found", p->sym->name);
return 1;
}
makedot(p, ty, o);
return 0;
}
/* initialize bit-field */
static void makeidot(struct node *p)
{
struct node *q;
q = node(OXXX, NULL, NULL);
*q = *p;
p->op = OBIT;
p->left = q;
p->right = NULL;
p->type = q->type;
p->addable = q->addable;
}
/* convert arg */
static int tconva(struct node *l, struct node *a, struct type *ty, int f)
{
int o;
if (a == NULL) {
if (ty != NULL && ty->etype != TVOID) {
error(0, "not enough function arguments");
return 1;
}
return 0;
}
if (a->op == OLIST) {
o = tconva(l, a->left, ty, 0);
if (ty) {
ty = ty->next;
if (ty == NULL)
ty = types[TVOID];
else if (ty->etype == TVOID) /* variadic */
ty = NULL;
}
return o | tconva(l, a->right, ty, 1);
}
if (f && ty) /* check last arg */
tconva(l, NULL, ty->next, 0);
if (a->op == OXXX) /* __builtin_va_arg */
return 0;
if (tconv(a) || tcompat(a, NULL, a->type, targ))
return 1;
if (eqtype(ty, types[TVOID], 1)) {
error(a, "too many function arguments");
return 1;
}
if (ty) {
typext(ty, a, 1);
if (stcompat(l, ty, a->type, tasgn)) {
error(a, "argument prototype mismatch '%T' for '%T'", a->type, ty);
return 1;
}
if (typei[ty->etype])
ty = promote(ty);
} else {
/* variadic case */
ty = promote(a->type);
}
if (!eqtype(ty, a->type, 1)) {
l = node(OXXX, NULL, NULL);
*l = *a;
a->op = OCAST;
a->type = ty;
a->left = l;
a->right = NULL;
a->addable = 0;
}
return 0;
}
/* check assignment to `const' */
static void constas(struct node *p, struct type *ty1, struct type *ty2)
{
struct type *l, *r;
l = ty1;
r = ty2;
if (l == NULL)
return;
if (l->qual & QCONST) {
warn(p, "assignment to a const type '%T'", ty2);
return;
}
if (r == NULL)
return;
while (1) {
if (l->etype != TPTR || r->etype != TPTR)
break;
l = l->link;
r = r->link;
if (l == NULL || r == NULL)
break;
if (r->qual & QCONST)
if (!(l->qual & QCONST)) {
warn(p, "type qualifiers discarded: '%T'", ty2);
break;
}
}
}
/* builtin functions */
static int tconvb(struct node *p)
{
struct node *l, *r;
struct node *q;
struct type *ty;
l = p->left;
if (l == NULL || l->op != ONAME || l->sym == NULL)
return 0;
r = p->right;
if (l->sym->builtin_id == BUILTIN_VA_START) {
if (thisfn == NULL || thisfn->etype != TFUNC) {
error(p, "'va_start' misused");
return 1;
}
if (!thisfn->oldstyle && !variadic(thisfn)) {
error(p, "'va_start' used in function with fixed args");
return 1;
}
}
if (l->sym->builtin_id == BUILTIN_VA_ARG) {
ty = r->right->type;
if (ty->size < 1) {
error(p, "'va_arg' with incomplete type '%T'", ty);
return 1;
}
ty = promote(ty);
ty = ptrtyp(ty);
r->right = NULL;
/* INDIR(CAST(p)) */
q = node(OXXX, NULL, NULL);
*q = *p;
p->op = OCAST;
p->left = q;
p->right = NULL;
p->type = ty;
q = node(OXXX, NULL, NULL);
*q = *p;
p->op = OINDIR;
p->left = q;
p->right = NULL;
p->type = q->type->link;
p->addable = 1;
}
return 0;
}
/* compound literal */
static int tconvcp(struct node *p)
{
if (p->op != OLIST)
return tconv(p);
return tconvcp(p->left) | tconvcp(p->right);
}
static int tconvo(struct node *p, int f)
{
struct node *l, *r;
struct type *ty;
p->addable = 0;
l = p->left;
r = p->right;
switch (p->op) {
case OCOMMA:
if (tconv(l) | tconv(r))
goto bad;
p->type = r->type;
break;
/* same as AS, but
1. no test for `const'
2. handle bit-field initialization */
case OASI:
if (tconv(l) | tconv(r))
goto bad;
if (tlvalue(l))
goto bad;
typext(l->type, r, 1);
if (tcompat(p, l->type, r->type, tasgn))
goto bad;
if (l->type->nbits)
makeidot(l);
if (!eqtype(l->type, r->type, 1)) {
r = node(OCAST, r, NULL);
r->type = l->type;
p->right = r;
}
p->type = l->type;
p->op = OAS;
break;
case OAS:
if (tconv(l) | tconv(r))
goto bad;
if (tlvalue(l))
goto bad;
typext(l->type, r, 1);
if (tcompat(p, l->type, r->type, tasgn))
goto bad;
constas(p, l->type, r->type);
if (!eqtype(l->type, r->type, 1)) {
r = node(OCAST, r, NULL);
r->type = l->type;
p->right = r;
}
p->type = l->type;
break;
case OASADD:
case OASSUB:
if (tconv(l) | tconv(r))
goto bad;
if (tlvalue(l))
goto bad;
if (tcompat(p, l->type, r->type, tasadd))
goto bad;
constas(p, l->type, r->type);
ty = l->type;
/* perform arith conv and then remove cast added by arith */
arith(p);
while (p->left->op == OCAST)
p->left = p->left->left;
p->type = ty;
break;
case OASMUL:
case OASUMUL:
case OASDIV:
case OASUDIV:
if (tconv(l) | tconv(r))
goto bad;
if (tlvalue(l))
goto bad;
if (tcompat(p, l->type, r->type, tmul))
goto bad;
constas(p, l->type, r->type);
ty = l->type;
arith(p);
while (p->left->op == OCAST)
p->left = p->left->left;
p->type = ty;
if (typeu[p->type->etype]) {
if (p->op == OASDIV)
p->op = OASUDIV;
if (p->op == OASMUL)
p->op = OASUMUL;
}
break;
case OASMOD:
case OASUMOD:
case OASXOR:
case OASAND:
case OASOR:
case OASSHL:
case OASSHR:
case OASUSHR:
if (tconv(l) | tconv(r))
goto bad;
if (tlvalue(l))
goto bad;
if (tcompat(p, l->type, r->type, tand))
goto bad;
constas(p, l->type, r->type);
ty = l->type;
arith(p);
while (p->left->op == OCAST)
p->left = p->left->left;
p->type = ty;
if (typeu[p->type->etype]) {
if (p->op == OASMOD)
p->op = OASUMOD;
if (p->op == OASSHR)
p->op = OASUSHR;
}
break;
case OCOND:
if (tconv(l) | tconv(r->left) | tconv(r->right))
goto bad;
if (tcompat(p, NULL, l->type, tnot))
goto bad;
if (r->left->type->etype == TPTR && nullptr_p(r->right))
r->right->type = r->left->type;
if (r->right->type->etype == TPTR && nullptr_p(r->left))
r->left->type = r->right->type;
if (eqtype(r->left->type, r->right->type, 0)) {
r->type = r->right->type;
p->type = r->type;
break;
}
if (tcompat(r, r->left->type, r->right->type, trel))
goto bad;
arith(r);
p->type = r->type;
break;
case OADD:
if (tconv(l) | tconv(r))
goto bad;
if (tcompat(p, l->type, r->type, tadd))
goto bad;
arith(p);
break;
case OSUB:
if (tconv(l) | tconv(r))
goto bad;
if (tcompat(p, l->type, r->type, tsub))
goto bad;
arith(p);
break;
case OMUL:
case OUMUL:
case ODIV:
case OUDIV:
if (tconv(l) | tconv(r))
goto bad;
if (tcompat(p, l->type, r->type, tmul))
goto bad;
arith(p);
if (typeu[p->type->etype]) {
if (p->op == ODIV)
p->op = OUDIV;
if (p->op == OMUL)
p->op = OUMUL;
}
break;
case OMOD:
case OUMOD:
case OAND:
case OOR:
case OXOR:
case OSHL:
case OSHR:
case OUSHR:
if (tconv(l) | tconv(r))
goto bad;
if (tcompat(p, l->type, r->type, tand))
goto bad;
arith(p);
if (typeu[p->type->etype]) {
if (p->op == OMOD)
p->op = OUMOD;
if (p->op == OSHR)
p->op = OUSHR;
}
break;
case OGT:
case OGE:
case OLT:
case OLE:
if (tconv(l) | tconv(r))
goto bad;
typext(l->type, r, 0);
typext(r->type, l, 0);
if (tcompat(p, l->type, r->type, trel))
goto bad;
arith(p);
p->type = types[TINT];
break;
case OEQ:
case ONE:
if (tconv(l) | tconv(r))
goto bad;
if (l->type->etype == TPTR && r->type->etype == TPTR) {
if (l->type->link->etype == TVOID)
typext(l->type, r, 1);
else if (r->type->link->etype == TVOID)
typext(r->type, l, 1);
}
if (l->type->etype == TPTR && nullptr_p(r))
r->type = l->type;
if (r->type->etype == TPTR && nullptr_p(l))
l->type = r->type;
if (tcompat(p, l->type, r->type, trel))
goto bad;
arith(p);
p->type = types[TINT];
break;
case OANDAND:
case OOROR:
if (tconv(l) | tconv(r))
goto bad;
if (tcompat(p, NULL, l->type, tnot) | tcompat(p, NULL, r->type, tnot))
goto bad;
p->type = types[TINT];
break;
case OCAST:
if (tconv(l))
goto bad;
if (tcompat(p, l->type, p->type, tcast))
goto bad;
break;
case OPOS:
if (tconv(l))
goto bad;
if (tcompat(p, NULL, l->type, tneg))
goto bad;
arith(p);
*p = *p->left;
p->addable = 0;
break;
case ONEG: /* -x = 0-x */
if (tconv(l))
goto bad;
if (tcompat(p, NULL, l->type, tneg))
goto bad;
if (typefd[l->type->etype]) {
r = l;
l = node1(OCONST, NULL, NULL);
l->type = types[TINT];
l->v.i = 0;
p->op = OSUB;
p->left = l;
p->right = r;
}
arith(p);
break;
case OCOM:
if (tconv(l))
goto bad;
if (tcompat(p, l->type, types[TINT], tand))
goto bad;
arith(p);
break;
case ONOT:
if (tconv(l))
goto bad;
if (tcompat(p, NULL, l->type, tnot))
goto bad;
arith(p);
p->type = types[TINT];
break;
case OSIZEOF:
if (l != NULL) {
if (tconvo(l, 0))
goto bad;
if (p->op == OBIT) {
error(p, "'sizeof' bitfield");
goto bad;
}
p->type = l->type;
}
if (p->type == NULL)
goto bad;
if (p->type->etype == TFUNC) {
error(p, "'sizeof' function");
goto bad;
}
if (p->type->size < 1) {
error(p, "'sizeof' incomplete type '%T'", p->type);
goto bad;
}
p->op = OCONST;
p->left = NULL;
p->right = NULL;
p->v.i = p->type->size;
p->type = types[TULONG];
break;
case OADDR:
if (tconvo(l, ADDROP))
goto bad;
if (tlvalue(l))
goto bad;
if (l->type->nbits) {
error(p, "address of a bit-field");
goto bad;
}
/* TODO: CREGISTER ignore... */
if (l->op == ONAME && l->sclass == CREGISTER) {
error(p, "address of a register");
goto bad;
}
p->type = ptrtyp(l->type);
break;
case OINDIR:
if (tconv(l))
goto bad;
if (tcompat(p, NULL, l->type, tindir))
goto bad;
p->type = l->type->link;
p->addable = 1;
break;
case OPREINC:
case OPREDEC:
case OPOSTINC:
case OPOSTDEC:
if (tconv(l))
goto bad;
if (tlvalue(l))
goto bad;
if (tcompat(p, l->type, types[TINT], tadd))
goto bad;
p->type = l->type;
if (p->type->etype == TPTR)
if (p->type->link->size < 1) {
error(p, "inc/dec of incomplete size");
goto bad;
}
break;
case ODOT:
if (tconv(l))
goto bad;
if (tcompat(p, NULL, l->type, tdot))
goto bad;
if (tconvd(p))
goto bad;
break;
case OFUNC:
if (tconvo(l, 0))
goto bad;
if (l->type->etype == TPTR && l->type->link->etype == TFUNC) {
l = node(OINDIR, l, NULL);
l->type = l->left->type->link;
p->left = l;
}
if (tcompat(p, NULL, l->type, tfunc))
goto bad;
if (tconva(l, r, l->type->next, 1))
goto bad;
p->type = l->type->link;
if (tconvb(p))
goto bad;
if (p->type->etype != TVOID && p->type->size < 1) {
error(p, "function with incomplete type '%T'", p->type);
goto bad;
}
break;
case ONAME:
if (p->type == NULL) {
error(p, "'%s' not declared", p->sym->name);
goto bad;
}
if (p->sclass == CENUM) {
p->op = OCONST;
p->type = p->type->link;
p->v.i = p->sym->vconst;
break;
}
p->addable = 1;
break;
case OSTRING:
p->offset = gstring(p->v.cstring, p->type->size);
p->addable = 1;
p->op = ONAME;
break;
case OCOMPOUND:
if (tconvcp(l))
goto bad;
p->addable = 1;
break;
case OCONST:
break;
case OZERO:
if (tconv(l) | tconv(r))
goto bad;
p->type = types[TVOID];
break;
case OPROTO:
/* tconv has been called on subtree */
*p = *p->left;
if (p->type == NULL)
goto bad;
break;
default:
error(p, "unknown op(%O) in type conv", p->op);
goto bad;
}
ty = p->type;
if (ty == NULL)
goto bad;
if (typeaf[ty->etype]) {
if (f & ADDROF)
goto addrof;
}
return 0;
addrof:
if (tlvalue(p))
goto bad;
l = node(OXXX, NULL, NULL);
*l = *p;
p->op = OADDR;
if (l->type->etype == TARRAY)
l->type = l->type->link;
p->left = l;
p->right = NULL;
p->addable = 0;
p->type = ptrtyp(l->type);
return 0;
bad:
p->type = NULL;
return 1;
}
int tconv(struct node *p)
{
return tconvo(p, ADDROF);
}
/* has side effect? return 0-no, 1-yes */
static int side(struct node *p)
{
loop:
if (p)
switch (p->op) {
case OCAST:
case OPOS:
case ONEG:
case OCOM:
case ONOT:
case OADDR:
case OINDIR:
case ODOT:
case OBIT:
p = p->left;
goto loop;
case OCOND:
if (side(p->left))
break;
p = p->right;
/* fall thru */
case OCOMMA:
case OADD:
case OSUB:
case OMUL:
case OUMUL:
case ODIV:
case OUDIV:
case OMOD:
case OUMOD:
case OAND:
case OOR:
case OSHL:
case OSHR:
case OUSHR:
case OXOR:
case OLT:
case OLE:
case OGT:
case OGE:
case OEQ:
case ONE:
case OANDAND:
case OOROR:
if (side(p->left))
break;
p = p->right;
goto loop;
case ONAME:
case OCONST:
case OSTRING:
case OSIZEOF:
return 0;
}