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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 escaping stores of addreses of auto
variables.
{ dg-do compile }
{ dg-options "-O0 -Wall -ftrack-macro-expansion=0" }
{ dg-require-effective-target alloca } */
void* alloca (__SIZE_TYPE__);
void* sink (void*, ...);
extern void *evp;
void nowarn_store_extern_call (void)
{
int x;
evp = &x;
sink (0);
}
void nowarn_store_extern_ovrwrite (void)
{
int x;
evp = &x;
evp = 0;
}
void nowarn_store_extern_store (void)
{
int x;
void **p = (void**)sink (&evp);
evp = &x;
*p = 0;
}
void warn_store_alloca (int n)
{
// This fails because of a bug in the warning.
void *p = alloca (n);
evp = p; // { dg-warning "storing the address of local variable 'x' in 'evp1'" "pr??????" { xfail *-*-* } }
}
void warn_store_extern (void)
{
extern void *evp1; // { dg-message "'evp1' declared here" }
int x; // { dg-message "'x' declared here" }
evp1 = &x; // { dg-warning "storing the address of local variable 'x' in 'evp1'" }
}
void nowarn_store_arg_call (void **vpp)
{
int x;
*vpp = &x;
sink (0);
}
void nowarn_store_arg_ovrwrite (void **vpp)
{
int x;
*vpp = &x;
*vpp = 0;
}
void nowarn_store_arg_store (void **vpp)
{
int x;
void **p = (void**)sink (0);
*vpp = &x;
*p = 0;
}
void* nowarn_store_arg_store_arg (void **vpp1, void **vpp2)
{
int x;
void **p = (void**)sink (0);
*vpp1 = &x; // warn here?
*vpp2 = 0; // might overwrite *vpp1
return p;
}
void warn_store_arg (void **vpp)
{
int x; // { dg-message "'x' declared here" }
*vpp = &x; // { dg-warning "storing the address of local variable 'x' in '\\*vpp'" }
}
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