50 lines · cpp
1// Cross comdat example2// Both the parent and child VTablea are in their own comdat sections.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// Comdats are emitted for both A and B in this module and for their respective implementations of foo().8// CHECK: $_ZN1A3fooEv = comdat any9// CHECK: $_ZN1B3fooEv = comdat any10// CHECK: $_ZTV1A = comdat any11// CHECK: $_ZTI1A = comdat any12// CHECK: $_ZTS1A = comdat any13// CHECK: $_ZTI1A.rtti_proxy = comdat any14// CHECK: $_ZTV1B = comdat any15// CHECK: $_ZTI1B = comdat any16// CHECK: $_ZTS1B = comdat any17// CHECK: $_ZTI1B.rtti_proxy = comdat any18 19// Both the vtables for A and B are emitted and in their own comdats.20// CHECK: @_ZTV1A.local = linkonce_odr hidden unnamed_addr constant { [3 x i32] } { [3 x i32] [i32 0, i32 trunc (i64 sub (i64 ptrtoint (ptr @_ZTI1A.rtti_proxy to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [3 x i32] }, ptr @_ZTV1A.local, i32 0, i32 0, i32 2) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @_ZN1A3fooEv to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [3 x i32] }, ptr @_ZTV1A.local, i32 0, i32 0, i32 2) to i64)) to i32)] }, comdat($_ZTV1A), align 421// CHECK: @_ZTV1B.local = linkonce_odr hidden unnamed_addr constant { [3 x i32] } { [3 x i32] [i32 0, i32 trunc (i64 sub (i64 ptrtoint (ptr @_ZTI1B.rtti_proxy to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [3 x i32] }, ptr @_ZTV1B.local, i32 0, i32 0, i32 2) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @_ZN1B3fooEv to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [3 x i32] }, ptr @_ZTV1B.local, i32 0, i32 0, i32 2) to i64)) to i32)] }, comdat($_ZTV1B), align 422 23// CHECK: @_ZTV1A = linkonce_odr unnamed_addr alias { [3 x i32] }, ptr @_ZTV1A.local24// CHECK: @_ZTV1B = linkonce_odr unnamed_addr alias { [3 x i32] }, ptr @_ZTV1B.local25 26// CHECK: declare void @_Z5A_fooP1A(ptr noundef)27 28// The stubs and implementations for foo() are in their own comdat sections.29// CHECK: define linkonce_odr void @_ZN1A3fooEv(ptr {{.*}}%this) unnamed_addr #{{[0-9]+}} comdat30 31// CHECK: define linkonce_odr void @_ZN1B3fooEv(ptr {{.*}}%this) unnamed_addr #{{[0-9]+}} comdat32 33class A {34public:35 inline virtual void foo() {}36};37class B : public A {38public:39 inline void foo() override {}40};41void A_foo(A *a);42 43// func() is used so that the vtable for B is accessed when creating the instance.44void func() {45 A a;46 B b;47 A_foo(&a);48 A_foo(&b);49}50