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improved qualifier checking

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This commit is contained in:
eck 1989-11-13 14:01:50 +00:00
parent c30769327b
commit 776233c718
3 changed files with 29 additions and 28 deletions
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51
lang/cem/cemcom.ansi/ch3.c
View file

@ -170,6 +170,7 @@ ch3cast(expp, oper, tp)
expression of class Type.
*/
register struct type *oldtp;
int qual_lev;
if (oper == RETURN && tp->tp_fund == VOID) {
expr_strict(*expp, "return <expression> in function returning void");
@ -195,8 +196,19 @@ ch3cast(expp, oper, tp)
}
else
#endif NOBITFIELD
if (equal_type(tp, oldtp, oper != CAST)) {
if (oper == CASTAB || oper == '=' || oper == RETURN) {
qual_lev = -2;
} else if (oper == CAST) qual_lev = -999; /* ??? hack */
else qual_lev = -1;
if (equal_type(tp, oldtp, qual_lev)) {
/* life is easy */
if (qual_lev == -2 && tp->tp_fund == POINTER) {
if ((tp->tp_up->tp_typequal & oldtp->tp_up->tp_typequal)
!= oldtp->tp_up->tp_typequal) {
expr_strict( *expp, "qualifier error");
}
}
(*expp)->ex_type = tp; /* so qualifiers are allright */
}
else
@ -336,11 +348,11 @@ ch3cast(expp, oper, tp)
/* Determine whether two types are equal.
*/
equal_type(tp, otp, check_qual)
equal_type(tp, otp, qual_lev)
register struct type *tp, *otp;
int check_qual;
int qual_lev;
{
if (tp == otp)
if (tp == otp)
return 1;
if (!tp
|| !otp
@ -352,6 +364,10 @@ equal_type(tp, otp, check_qual)
if (tp->tp_size != otp->tp_size)
return 0;
}
if (qual_lev >= 0) {
if (tp->tp_typequal != otp->tp_typequal)
strict("illegal qualifiers");
}
switch (tp->tp_fund) {
@ -367,7 +383,7 @@ equal_type(tp, otp, check_qual)
if (!legal_mixture(tp, otp))
return 0;
}
return equal_type(tp->tp_up, otp->tp_up, 0);
return equal_type(tp->tp_up, otp->tp_up, qual_lev + 1);
case ARRAY:
/* If one type is an array of known size, the composite
@ -376,28 +392,13 @@ equal_type(tp, otp, check_qual)
if (tp->tp_size != otp->tp_size &&
(tp->tp_size != -1 && otp->tp_size != -1))
return 0;
return equal_type(tp->tp_up, otp->tp_up, check_qual);
return equal_type(tp->tp_up, otp->tp_up, qual_lev); /* ??? +1 */
case POINTER:
if (equal_type(tp->tp_up, otp->tp_up, check_qual)) {
if (check_qual) {
if (otp->tp_up->tp_typequal & TQ_CONST) {
if (!(tp->tp_up->tp_typequal & TQ_CONST)) {
strict("illegal use of pointer to const object");
}
}
if (otp->tp_up->tp_typequal & TQ_VOLATILE) {
if (!(tp->tp_up->tp_typequal & TQ_VOLATILE)) {
strict("illegal use of pointer to volatile object");
}
}
}
return 1;
}
else return 0;
return equal_type(tp->tp_up, otp->tp_up, qual_lev + 1);
case FIELD:
return equal_type(tp->tp_up, otp->tp_up, check_qual);
return equal_type(tp->tp_up, otp->tp_up, qual_lev); /* ??? +1 */
case STRUCT:
case UNION:
@ -426,7 +427,7 @@ check_pseudoproto(pl, opl)
return 0;
}
while (pl && opl) {
if (!equal_type(pl->pl_type, opl->pl_type, 0)) {
if (!equal_type(pl->pl_type, opl->pl_type, -1)) {
if (!(pl->pl_flag & PL_ERRGIVEN)
&& !(opl->pl_flag & PL_ERRGIVEN))
error("incorrect type for parameter %s of definition",
@ -500,7 +501,7 @@ equal_proto(pl, opl)
while ( pl && opl) {
if ((pl->pl_flag & ~PL_ERRGIVEN) != (opl->pl_flag & ~PL_ERRGIVEN) ||
!equal_type(pl->pl_type, opl->pl_type, 0))
!equal_type(pl->pl_type, opl->pl_type, -1))
return 0;
pl = pl->next;

4
lang/cem/cemcom.ansi/ch3bin.c
View file

@ -236,7 +236,7 @@ ch3bin(expp, oper, expr)
if ( is_struct_or_union(expp_tp->tp_fund)
|| is_struct_or_union(expr->ex_type->tp_fund)
) {
if (!equal_type(expp_tp, expr->ex_type, 0))
if (!equal_type(expp_tp, expr->ex_type, -1))
expr_error(*expp, "illegal balance");
}
else
@ -284,7 +284,7 @@ pntminuspnt(expp, oper, expr)
*/
struct type *up_type = (*expp)->ex_type->tp_up;
if (!equal_type(up_type, expr->ex_type->tp_up, 0)) {
if (!equal_type(up_type, expr->ex_type->tp_up, -1)) {
expr_error(*expp, "subtracting incompatible pointers");
free_expression(expr);
erroneous2int(expp);

2
lang/cem/cemcom.ansi/idf.c
View file

@ -610,7 +610,7 @@ check_formals(idf, dc)
}
while(fm && pl) {
if (!equal_type(promoted_type(fm->fm_idf->id_def->df_type)
, pl->pl_type, 0)) {
, pl->pl_type, -1)) {
if (!(pl->pl_flag & PL_ERRGIVEN))
error("incorrect type for parameter %s"
, fm->fm_idf->id_text);