9d525bf94b
- When the destination is a final class type that does not derive from the source type, the cast always fails and is now emitted as a null pointer or call to __cxa_bad_cast. - When the destination is a final class type that does derive from the source type, emit a direct comparison against the corresponding base class vptr value(s). There may be more than one such value in the case of multiple inheritance; check them all. For now, this is supported only for the Itanium ABI. I expect the same thing is possible for the MS ABI too, but I don't know what guarantees are made about vfptr uniqueness. Reviewed By: rjmccall Differential Revision: https://reviews.llvm.org/D154658
5 lines
312 B
C++
5 lines
312 B
C++
// RUN: %clang -### -fno-assume-unique-vtables %s -S 2>&1 | FileCheck -check-prefix=CHECK-OPT %s
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// RUN: %clang -### -fno-assume-unique-vtables -fassume-unique-vtables %s -S 2>&1 | FileCheck -check-prefix=CHECK-NOOPT %s
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// CHECK-OPT: "-fno-assume-unique-vtables"
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// CHECK-NOOPT-NOT: "-fno-assume-unique-vtables"
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