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Fix conversion in a?0:ptr.

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(cond ? 0 : ptr)->member wasn't handled correctly.  If one arm
is a null pointer constant (which also can be a pointer) the result
type is that of the other arm.
This commit is contained in:
Michael Matz 2012-04-14 23:50:21 +02:00
parent f98c2306a0
commit 6471ec0a2b
2 changed files with 27 additions and 5 deletions
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19
tccgen.c
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@ -1489,7 +1489,8 @@ static inline int is_null_pointer(SValue *p)
if ((p->r & (VT_VALMASK | VT_LVAL | VT_SYM)) != VT_CONST)
return 0;
return ((p->type.t & VT_BTYPE) == VT_INT && p->c.i == 0) ||
((p->type.t & VT_BTYPE) == VT_LLONG && p->c.ll == 0);
((p->type.t & VT_BTYPE) == VT_LLONG && p->c.ll == 0) ||
((p->type.t & VT_BTYPE) == VT_PTR && p->c.ptr == 0);
}
static inline int is_integer_btype(int bt)
@ -4116,14 +4117,22 @@ static void expr_cond(void)
(t2 & (VT_BTYPE | VT_UNSIGNED)) == (VT_LLONG | VT_UNSIGNED))
type.t |= VT_UNSIGNED;
} else if (bt1 == VT_PTR || bt2 == VT_PTR) {
/* XXX: test pointer compatibility */
type = type1;
/* If one is a null ptr constant the result type
is the other. */
if (is_null_pointer (vtop))
type = type1;
else if (is_null_pointer (&sv))
type = type2;
/* XXX: test pointer compatibility, C99 has more elaborate
rules here. */
else
type = type1;
} else if (bt1 == VT_FUNC || bt2 == VT_FUNC) {
/* XXX: test function pointer compatibility */
type = type1;
type = bt1 == VT_FUNC ? type1 : type2;
} else if (bt1 == VT_STRUCT || bt2 == VT_STRUCT) {
/* XXX: test structure compatibility */
type = type1;
type = bt1 == VT_STRUCT ? type1 : type2;
} else if (bt1 == VT_VOID || bt2 == VT_VOID) {
/* NOTE: as an extension, we accept void on only one side */
type.t = VT_VOID;

13
tests/tcctest.c
View File

@ -2486,3 +2486,16 @@ void const_warn_test(void)
{
const_func(1);
}
struct condstruct {
int i;
};
int getme (struct condstruct *s, int i)
{
int i1 = (i == 0 ? 0 : s)->i;
int i2 = (i == 0 ? s : 0)->i;
int i3 = (i == 0 ? (void*)0 : s)->i;
int i4 = (i == 0 ? s : (void*)0)->i;
return i1 + i2 + i3 + i4;
}