32 lines · cpp
1// Check the layout of the vtable for a normal class.2 3// RUN: %clang_cc1 %s -triple=aarch64-unknown-fuchsia -O1 -o - -emit-llvm -fhalf-no-semantic-interposition | FileCheck %s4 5// We should be emitting comdats for each of the virtual function RTTI proxies6// CHECK: $_ZTI1A.rtti_proxy = comdat any7 8// VTable contains offsets and references to the hidden symbols9// The vtable definition itself is private so we can take relative references to10// it. The vtable symbol will be exposed through a public alias.11// CHECK: @_ZTV1A.local = internal unnamed_addr constant { [3 x i32] } { [3 x i32] [i32 0, i32 trunc (i64 sub (i64 ptrtoint (ptr @_ZTI1A.rtti_proxy to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [3 x i32] }, ptr @_ZTV1A.local, i32 0, i32 0, i32 2) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @_ZN1A3fooEv to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [3 x i32] }, ptr @_ZTV1A.local, i32 0, i32 0, i32 2) to i64)) to i32)] }, align 412// CHECK: @_ZTI1A ={{.*}} constant { ptr, ptr } { ptr getelementptr inbounds (i8, ptr @_ZTVN10__cxxabiv117__class_type_infoE, i32 8), ptr @_ZTS1A }, align 813// CHECK: @_ZTVN10__cxxabiv117__class_type_infoE = external global [0 x ptr]14// CHECK: @_ZTS1A ={{.*}} constant [3 x i8] c"1A\00", align 115 16// The rtti should be in a comdat17// CHECK: @_ZTI1A.rtti_proxy = {{.*}}comdat18 19// The vtable symbol is exposed through an alias.20// @_ZTV1A = dso_local unnamed_addr alias { [3 x i32] }, ptr @_ZTV1A.local21 22class A {23public:24 virtual void foo();25};26 27void A::foo() {}28 29void A_foo(A *a) {30 a->foo();31}32