clang/test/CodeGenCXX/RelativeVTablesABI/simple-vtable-definition.cpp

   1 // Check the layout of the vtable for a normal class.
   2
   3 // RUN: %clang_cc1 %s -triple=aarch64-unknown-fuchsia -O1 -S -o - -emit-llvm -fhalf-no-semantic-interposition | FileCheck %s
   4
   5 // We should be emitting comdats for each of the virtual function RTTI proxies
   6 // CHECK: $_ZTI1A.rtti_proxy = comdat any
   7
   8 // VTable contains offsets and references to the hidden symbols
   9 // The vtable definition itself is private so we can take relative references to
  10 // it. The vtable symbol will be exposed through a public alias.
  11 // CHECK: @_ZTV1A.local = private 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 4
  12 // CHECK: @_ZTVN10__cxxabiv117__class_type_infoE = external global [0 x ptr]
  13 // CHECK: @_ZTS1A ={{.*}} constant [3 x i8] c"1A\00", align 1
  14 // CHECK: @_ZTI1A ={{.*}} constant { ptr, ptr } { ptr getelementptr inbounds (i8, ptr @_ZTVN10__cxxabiv117__class_type_infoE, i32 8), ptr @_ZTS1A }, align 8
  15
  16 // The rtti should be in a comdat
  17 // CHECK: @_ZTI1A.rtti_proxy = {{.*}}comdat
  18
  19 // The vtable symbol is exposed through an alias.
  20 // @_ZTV1A = dso_local unnamed_addr alias { [3 x i32] }, ptr @_ZTV1A.local
  21
  22 class A {
  23 public:
  24   virtual void foo();
  25 };
  26
  27 void A::foo() {}
  28
  29 void A_foo(A *a) {
  30   a->foo();
  31 }