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// Tests that under -enable-llvm-vfe, LLVM GlobalDCE is able to remove unused
// virtual methods, and that used virtual methods are not removed (by running
// the program).
// RUN: %empty-directory(%t)
// RUN: %target-build-swift -Xfrontend -enable-llvm-vfe %s -Onone -emit-ir -o %t/main.ll
// RUN: %target-clang %t/main.ll -isysroot %sdk -L%swift-lib-dir/swift/%target-sdk-name -flto -o %t/main
// RUN: %target-codesign %t/main
// RUN: %target-run %t/main | %FileCheck %s
// RUN: %llvm-nm --defined-only %t/main | %FileCheck %s --check-prefix=NM
// REQUIRES: executable_test
// FIXME(mracek): More work needed to get this to work on non-Apple platforms.
// REQUIRES: VENDOR=apple
// For LTO, the linker dlopen()'s the libLTO library, which is a scenario that
// ASan cannot work in ("Interceptors are not working, AddressSanitizer is
// loaded too late").
// REQUIRES: no_asan
class MyClass {
func foo() { print("MyClass.foo") }
func bar() { print("MyClass.bar") }
}
class MyDerivedClass<T>: MyClass {
override func foo() { print("MyDerivedClass<T>.foo, T=\(type(of: T.self))") }
override func bar() { print("MyDerivedClass<T>.bar, T=\(type(of: T.self))") }
}
let o: MyClass = MyDerivedClass<Int>()
o.foo()
// CHECK: MyDerivedClass<T>.foo, T=Int.Type
// NM-NOT: $s4main14MyDerivedClassC3baryyF
// NM: $s4main14MyDerivedClassC3fooyyF
// NM-NOT: $s4main7MyClassC3baryyF
// NM: $s4main7MyClassC3fooyyF
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