clang/test/CodeGenCXX/RelativeVTablesABI/relative-vtables-hwasan.cpp

   1 // RUN: %clang_cc1 %s -triple=aarch64-unknown-fuchsia -S -o - -emit-llvm -fsanitize=hwaddress | FileCheck %s
   2
   3 /// The usual vtable will have default visibility. In this case, the actual
   4 /// vtable is hidden and the alias is made public. With hwasan enabled, we want
   5 /// to ensure the local one self-referenced in the hidden vtable is not
   6 /// hwasan-instrumented.
   7 // CHECK-DAG: @_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)] }, no_sanitize_hwaddress, align 4
   8 // CHECK-DAG: @_ZTV1A = unnamed_addr alias { [3 x i32] }, ptr @_ZTV1A.local
   9 // CHECK-DAG: @_ZTI1A.rtti_proxy = linkonce_odr hidden unnamed_addr constant ptr @_ZTI1A, no_sanitize_hwaddress, comdat
  10
  11 class A {
  12 public:
  13   virtual void foo();
  14 };
  15
  16 void A::foo() {}
  17
  18 void A_foo(A *a) {
  19   a->foo();
  20 }
  21
  22 /// If the vtable happens to be hidden, then the alias is not needed. In this
  23 /// case, the original vtable struct itself should be unsanitized.
  24 // CHECK-DAG: @_ZTV1B = 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, 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, i32 0, i32 0, i32 2) to i64)) to i32)] }, no_sanitize_hwaddress, align 4
  25 // CHECK-DAG: @_ZTI1B.rtti_proxy = linkonce_odr hidden unnamed_addr constant ptr @_ZTI1B, no_sanitize_hwaddress, comdat
  26
  27 class __attribute__((visibility("hidden"))) B {
  28 public:
  29   virtual void foo();
  30 };
  31
  32 void B::foo() {}
  33
  34 void B_foo(B *b) {
  35   b->foo();
  36 }