clang/test/CodeGenCXX/RelativeVTablesABI/parent-vtable-in-comdat.cpp

   1 // Cross comdat example
   2 // Parent VTable is in a comdat section.
   3
   4 // RUN: %clang_cc1 %s -triple=aarch64 -S -o - -emit-llvm -fexperimental-relative-c++-abi-vtables | FileCheck %s
   5 // RUN: %clang_cc1 %s -triple=x86_64 -S -o - -emit-llvm -fexperimental-relative-c++-abi-vtables | FileCheck %s
   6
   7 // A::foo() has a comdat since it is an inline function
   8 // CHECK: $_ZN1A3fooEv = 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: $_ZTI1A.rtti_proxy = comdat any
  15
  16 // The VTable for A is emitted here and in a comdat section since it has no key function, and is used in this module when creating an instance of A.
  17 // CHECK: @_ZTV1A.local = linkonce_odr hidden unnamed_addr constant { [3 x i32] } { [3 x i32] [i32 0, i32 trunc (i64 sub (i64 ptrtoint (ptr @_ZTI1A.rtti_proxy to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [3 x i32] }, ptr @_ZTV1A.local, i32 0, i32 0, i32 2) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @_ZN1A3fooEv to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [3 x i32] }, ptr @_ZTV1A.local, i32 0, i32 0, i32 2) to i64)) to i32)] }, comdat($_ZTV1A), align 4
  18 // CHECK: @_ZTVN10__cxxabiv117__class_type_infoE = external global [0 x ptr]
  19 // CHECK: @_ZTS1A = linkonce_odr constant [3 x i8] c"1A\00", comdat, align 1
  20 // CHECK: @_ZTI1A = linkonce_odr constant { ptr, ptr } { ptr getelementptr inbounds (i8, ptr @_ZTVN10__cxxabiv117__class_type_infoE, i32 8), ptr @_ZTS1A }, comdat, align 8
  21 // CHECK: @_ZTI1A.rtti_proxy = linkonce_odr hidden unnamed_addr constant ptr @_ZTI1A, comdat
  22 // CHECK: @_ZTV1A = linkonce_odr unnamed_addr alias { [3 x i32] }, ptr @_ZTV1A.local
  23
  24 // CHECK:      define linkonce_odr void @_ZN1A3fooEv(ptr {{.*}}%this) unnamed_addr #{{[0-9]+}} comdat
  25
  26 class A {
  27 public:
  28   inline virtual void foo() {}
  29 };
  30 class B : public A {
  31 public:
  32   void foo() override;
  33 };
  34 void A_foo(A *a);
  35
  36 void A_foo(A *a) { a->foo(); }
  37
  38 // func() is only used to emit a vtable.
  39 void func() {
  40   A a;
  41   A_foo(&a);
  42 }