LandingPadClause

This clause means that the landingpad block should be entered if the exception being thrown matches or is a subtype of its type.

For C++, the type is a pointer to the std::type_info object (an RTTI object) representing the C++ exception type.

If the type is null, any exception matches, so the landing pad should always be entered. This is used for C++ catch-all blocks (catch (...)).

When this clause is matched, the selector value will be equal to the value returned by @llvm.eh.typeid.for(i8* @ExcType). This will always be a positive value.

This clause means that the landing pad should be entered if the exception being thrown does not match any of the types in the list (which, for C++, are again specified as std::type_info pointers).

C++ front-ends use this to implement C++ exception specifications, such as void foo() throw (ExcType1, ..., ExcTypeN) { ... }.

When this clause is matched, the selector value will be negative.

The array argument to filter may be empty; for example, [0 x i8**] undef. This means that the landing pad should always be entered. (Note that such a filter would not be equivalent to catch i8* null, because filter and catch produce negative and positive selector values respectively.)