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

   1 /// Check that -fexperimental-omit-vtable-rtti omits the RTTI component from
   2 /// the vtable.
   3
   4 // RUN: %clang_cc1 %s -triple=aarch64-unknown-linux-gnu -fno-rtti -fexperimental-omit-vtable-rtti -S -o - -emit-llvm | FileCheck -check-prefixes=POINTER,RTTI %s
   5 // RUN: %clang_cc1 %s -triple=aarch64-unknown-linux-gnu -fexperimental-relative-c++-abi-vtables -fno-rtti -fexperimental-omit-vtable-rtti -S -o - -emit-llvm | FileCheck -check-prefixes=RELATIVE,RTTI %s
   6
   7 /// Normally, the vtable would contain at least three components:
   8 /// - An offset to top
   9 /// - A pointer to the RTTI struct
  10 /// - A virtual function
  11 ///
  12 /// Now vtables should have just two components.
  13 // POINTER: @_ZTV1A = unnamed_addr constant { [2 x ptr] } { [2 x ptr] [ptr null, ptr @_ZN1A3fooEv] }, align 8
  14 // RELATIVE: @_ZTV1A.local = private unnamed_addr constant { [2 x i32] } { [2 x i32] [i32 0, i32 trunc (i64 sub (i64 ptrtoint (ptr dso_local_equivalent @_ZN1A3fooEv to i64), i64 ptrtoint (ptr getelementptr inbounds ({ [2 x i32] }, ptr @_ZTV1A.local, i32 0, i32 0, i32 1) to i64)) to i32)] }, align 4
  15 // RELATIVE: @_ZTV1A = unnamed_addr alias { [2 x i32] }, ptr @_ZTV1A.local
  16
  17 /// None of these supplementary symbols should be emitted with -fno-rtti, but
  18 /// as a sanity check lets make sure they're not emitted also.
  19 // RTTI-NOT: @_ZTVN10__cxxabiv117__class_type_infoE
  20 // RTTI-NOT: @_ZTS1A
  21 // RTTI-NOT: @_ZTI1A
  22
  23 class A {
  24 public:
  25   virtual void foo();
  26 };
  27
  28 void A::foo() {}
  29
  30 void A_foo(A *a) {
  31   a->foo();
  32 }