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/* PR middle-end/63272 - GCC should warn when using pointer to dead scoped
variable within the same function
Exercise -Wdangling-pointer for VLAs.
{ dg-do compile }
{ dg-options "-O0 -Wall -ftrack-macro-expansion=0" }
{ dg-require-effective-target alloca } */
void sink (void*, ...);
void nowarn_vla (int n)
{
{
int vla1[n];
int *p1 = vla1;
sink (p1);
{
int vla2[n];
int *p2 = vla2;
sink (p1, p2);
{
int vla3[n];
int *p3 = vla3;
sink (p1, p2, p3);
}
sink (p1, p2);
}
sink (p1);
}
}
void warn_one_vla (int n)
{
int *p;
{
int vla[n]; // { dg-message "'vla' declared" "pr??????" { xfail *-*-* } }
p = vla;
}
sink (p); // { dg-warning "using a dangling pointer to 'vla'" "vla" { xfail *-*-* } }
}
void warn_two_vlas_same_block (int n)
{
int *p, *q;
{
int vla1[n]; // { dg-message "'vla1' declared" "pr??????" { xfail *-*-* } }
int vla2[n]; // { dg-message "'vla2' declared" "pr??????" { xfail *-*-* } }
p = vla1;
q = vla2;
}
sink (p); // { dg-warning "using a dangling pointer to 'vla1'" "vla" { xfail *-*-* } }
sink (q); // { dg-warning "using a dangling pointer to 'vla2'" "vla" { xfail *-*-* } }
}
void warn_two_vlas_in_series (int n)
{
int *p;
{
int vla1[n]; // { dg-message "'vla1' declared" "pr??????" { xfail *-*-* } }
p = vla1;
}
sink (p); // { dg-warning "using a dangling pointer to 'vla1'" "vla" { xfail *-*-* } }
int *q;
{
int vla2[n]; // { dg-message "'vla2' declared" "pr??????" { xfail *-*-* } }
q = vla2;
}
sink (q); // { dg-warning "using a dangling pointer to 'vla2'" "vla" { xfail *-*-* } }
}
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