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0 constant can be used as a pointer

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bellard 2002-01-03 21:29:54 +00:00
parent 1465899342
commit 8b41bc57e1
1 changed files with 20 additions and 18 deletions
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38
tcc.c
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@ -3237,18 +3237,6 @@ int is_compatible_types(int t1, int t2)
}
}
int check_assign_types(int t1, int t2)
{
t1 &= VT_TYPE;
t2 &= VT_TYPE;
if ((t1 & VT_BTYPE) == VT_PTR &&
(t2 & VT_BTYPE) == VT_FUNC) {
return is_compatible_types(pointed_type(t1), t2);
} else {
return is_compatible_types(t1, t2);
}
}
/* print a type. If 'varstr' is not NULL, then the variable is also
printed in the type */
/* XXX: union */
@ -3338,25 +3326,39 @@ void type_to_str(char *buf, int buf_size,
no_var: ;
}
/* verify type compatibility to store vtop in 'st' type, and generate
/* verify type compatibility to store vtop in 'dt' type, and generate
casts if needed. */
void gen_assign_cast(int dt)
{
int st;
char buf1[256], buf2[256];
st = vtop->t; /* destination type */
if (!check_assign_types(dt, st)) {
st = vtop->t; /* source type */
if ((dt & VT_BTYPE) == VT_PTR) {
/* special cases for pointers */
/* a function is implicitely a function pointer */
if ((st & VT_BTYPE) == VT_FUNC) {
if (!is_compatible_types(pointed_type(dt), st))
goto error;
else
goto type_ok;
}
/* '0' can also be a pointer */
if ((st & VT_BTYPE) == VT_INT &&
((vtop->r & (VT_VALMASK | VT_LVAL | VT_FORWARD)) == VT_CONST) &&
vtop->c.i == 0)
goto type_ok;
}
if (!is_compatible_types(dt, st)) {
error:
type_to_str(buf1, sizeof(buf1), st, NULL);
type_to_str(buf2, sizeof(buf2), dt, NULL);
error("cannot cast '%s' to '%s'", buf1, buf2);
}
type_ok:
gen_cast(dt);
}
/* store vtop in lvalue pushed on stack */
void vstore(void)
{