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Allow assume bounds casts for function pointers: tests #407

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Jul 8, 2020
Merged

Allow assume bounds casts for function pointers: tests #407

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25 changes: 25 additions & 0 deletions tests/typechecking/function_casts.c
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Original file line number Diff line number Diff line change
Expand Up @@ -307,6 +307,31 @@ void const_field_call(struct S1_Const s1, union U1_Const u1) {
u1.f2(0, 0);
}

// Check _Assume_bounds_casts
void assume_bounds_casts(struct S1 s1, struct S1_Const s1_const, ptr<int(int)> f1, int(*f2)(int, int), void(*g2)(void)) {
// _Assume_bounds_casts can be used to cast a checked function pointer
// to a checked function pointer.
ptr<int(int, int)> safe = _Assume_bounds_cast<ptr<int(int, int)>>(s1.f1);

// _Assume_bounds_casts can be used to cast an unchecked function pointer
// to a checked function pointer (if the unchecked pointer's pointee type
// is compatible with the checked pointer's pointee type).
ptr<int(int, int)> unsafe_to_safe = _Assume_bounds_cast<ptr<int(int, int)>>(s1.f2);
const ptr<int(int, int)> unsafe_to_safe_const = _Assume_bounds_cast<const ptr<int(int, int)>>(s1_const.f2);
s1.f1 = _Assume_bounds_cast<ptr<int(int, int)>>(f2);
s1.f1 = _Assume_bounds_cast<ptr<int(int, int)>>(s1.f2);

// _Assume_bounds_casts can be used to cast null to a checked function pointer.
ptr<int(void)> null_to_safe = _Assume_bounds_cast<ptr<int(void)>>(0);
s1.f1 = _Assume_bounds_cast<ptr<int(int, int)>>(0);

// _Assume_bounds_casts cannot be used to cast to a checked function pointer
// from an incompatible checked or unchecked type.
ptr<void(void)> incompat_safe = _Assume_bounds_cast<ptr<void(void)>>(f1); // expected-error {{cast to checked function pointer type '_Ptr<void (void)>' from incompatible checked pointer type '_Ptr<int (int)>'}}
ptr<int(int)> incompat_unsafe = _Assume_bounds_cast<ptr<int(int)>>(f2); // expected-error {{cast to checked function pointer type '_Ptr<int (int)>' from incompatible type 'int (*)(int, int)'}}
s1.f1 = _Assume_bounds_cast<ptr<int(int, int)>>(g2); // expected-error {{cast to checked function pointer type '_Ptr<int (int, int)>' from incompatible type 'void (*)(void)'}}
}

// Constness propagated via member access.
struct myops {
_Ptr<void (void)> myfptr;
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