43 lines · cpp
1// Cross comdat example2// Parent VTable is in a comdat section.3 4// RUN: %clang_cc1 %s -triple=aarch64 -o - -emit-llvm -fexperimental-relative-c++-abi-vtables | FileCheck %s5// RUN: %clang_cc1 %s -triple=x86_64 -o - -emit-llvm -fexperimental-relative-c++-abi-vtables | FileCheck %s6 7// A::foo() has a comdat since it is an inline function8// CHECK: $_ZN1A3fooEv = comdat any9// CHECK: $_ZTV1A = comdat any10// CHECK: $_ZTI1A = comdat any11// CHECK: $_ZTS1A = comdat any12 13// The VTable for A has its own comdat section bc it has no key function14// CHECK: $_ZTI1A.rtti_proxy = comdat any15 16// The VTable for A is emitted here and in a comdat section since it has no key function, and is used in this module when creating an instance of A.17// CHECK: @_ZTV1A.local = linkonce_odr hidden unnamed_addr constant { [3 x i32] } { [3 x i32] [i32 0, i32 trunc (i64 sub (i64 ptrtoint (ptr @_ZTI1A.rtti_proxy to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [3 x i32] }, ptr @_ZTV1A.local, i32 0, i32 0, i32 2) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @_ZN1A3fooEv to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [3 x i32] }, ptr @_ZTV1A.local, i32 0, i32 0, i32 2) to i64)) to i32)] }, comdat($_ZTV1A), align 418// CHECK: @_ZTI1A = linkonce_odr constant { ptr, ptr } { ptr getelementptr inbounds (i8, ptr @_ZTVN10__cxxabiv117__class_type_infoE, i32 8), ptr @_ZTS1A }, comdat, align 819// CHECK: @_ZTVN10__cxxabiv117__class_type_infoE = external global [0 x ptr]20// CHECK: @_ZTS1A = linkonce_odr constant [3 x i8] c"1A\00", comdat, align 121// CHECK: @_ZTI1A.rtti_proxy = linkonce_odr hidden unnamed_addr constant ptr @_ZTI1A, comdat22// CHECK: @_ZTV1A = linkonce_odr unnamed_addr alias { [3 x i32] }, ptr @_ZTV1A.local23 24// CHECK: define linkonce_odr void @_ZN1A3fooEv(ptr {{.*}}%this) unnamed_addr #{{[0-9]+}} comdat25 26class A {27public:28 inline virtual void foo() {}29};30class B : public A {31public:32 void foo() override;33};34void A_foo(A *a);35 36void A_foo(A *a) { a->foo(); }37 38// func() is only used to emit a vtable.39void func() {40 A a;41 A_foo(&a);42}43