1 // Cross comdat example 2 // Parent VTable is in a comdat section. 3 4 // RUN: %clang_cc1 %s -triple=aarch64-unknown-fuchsia -S -o - -emit-llvm -fexperimental-relative-c++-abi-vtables | FileCheck %s 5 6 // A::foo() has a comdat since it is an inline function 7 // CHECK: $_ZN1A3fooEv = comdat any 8 // CHECK: $_ZN1A3fooEv.stub = comdat any 9 // CHECK: $_ZTV1A = comdat any 10 // CHECK: $_ZTS1A = comdat any 11 12 // The VTable for A has its own comdat section bc it has no key function 13 // CHECK: $_ZTI1A = comdat any 14 // CHECK: $_ZTI1A.rtti_proxy = comdat any 15 16 // The VTable for A is emitted here and in a comdat section since it has no key function, and is used in this module when creating an instance of A. 17 // CHECK: @_ZTV1A.local = linkonce_odr hidden unnamed_addr constant { [3 x i32] } { [3 x i32] [i32 0, i32 trunc (i64 sub (i64 ptrtoint ({ i8*, i8* }** @_ZTI1A.rtti_proxy to i64), i64 ptrtoint (i32* getelementptr inbounds ({ [3 x i32] }, { [3 x i32] }* @_ZTV1A.local, i32 0, i32 0, i32 2) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (void (%class.A*)* @_ZN1A3fooEv.stub to i64), i64 ptrtoint (i32* getelementptr inbounds ({ [3 x i32] }, { [3 x i32] }* @_ZTV1A.local, i32 0, i32 0, i32 2) to i64)) to i32)] }, comdat($_ZTV1A), align 4 18 // CHECK: @_ZTVN10__cxxabiv117__class_type_infoE = external global i8* 19 // CHECK: @_ZTS1A = linkonce_odr constant [3 x i8] c"1A\00", comdat, align 1 20 // CHECK: @_ZTI1A = linkonce_odr constant { i8*, i8* } { i8* getelementptr inbounds (i8, i8* bitcast (i8** @_ZTVN10__cxxabiv117__class_type_infoE to i8*), i32 8), i8* getelementptr inbounds ([3 x i8], [3 x i8]* @_ZTS1A, i32 0, i32 0) }, comdat, align 8 21 // CHECK: @_ZTI1A.rtti_proxy = hidden unnamed_addr constant { i8*, i8* }* @_ZTI1A, comdat 22 // CHECK: @_ZTV1A = linkonce_odr unnamed_addr alias { [3 x i32] }, { [3 x i32] }* @_ZTV1A.local 23 24 // CHECK: define linkonce_odr void @_ZN1A3fooEv(%class.A* %this) unnamed_addr #{{[0-9]+}} comdat 25 26 // CHECK: define hidden void @_ZN1A3fooEv.stub(%class.A* %0) unnamed_addr #{{[0-9]+}} comdat { 27 // CHECK-NEXT: entry: 28 // CHECK-NEXT: tail call void @_ZN1A3fooEv(%class.A* %0) 29 // CHECK-NEXT: ret void 30 // CHECK-NEXT: } 31 32 class A { 33 public: 34 inline virtual void foo() {} 35 }; 36 class B : public A { 37 public: 38 void foo() override; 39 }; 40 void A_foo(A *a); 41 42 void A_foo(A *a) { a->foo(); } 43 44 // func() is only used to emit a vtable. 45 void func() { 46 A a; 47 A_foo(&a); 48 } 49