clang/test/CodeGenCXX/ubsan-vtable-checks.cpp

   1 // RUN: %clang_cc1 -std=c++11 -triple x86_64-unknown-linux -emit-llvm -fsanitize=null %s -o - | FileCheck %s --check-prefix=CHECK-NULL --check-prefix=ITANIUM
   2 // RUN: %clang_cc1 -std=c++11 -triple x86_64-windows -emit-llvm -fsanitize=null %s -o - | FileCheck %s --check-prefix=CHECK-NULL --check-prefix=MSABI
   3 // RUN: %clang_cc1 -std=c++11 -triple x86_64-unknown-linux -emit-llvm -fsanitize=null,vptr %s -o - | FileCheck %s --check-prefix=CHECK-VPTR --check-prefix=ITANIUM
   4 // RUN: %clang_cc1 -std=c++11 -triple x86_64-windows -emit-llvm -fsanitize=null,vptr %s -o - | FileCheck %s --check-prefix=CHECK-VPTR --check-prefix=MSABI  --check-prefix=CHECK-VPTR-MS
   5 struct T {
   6   virtual ~T() {}
   7   virtual int v() { return 1; }
   8 };
   9
  10 struct U : T {
  11   ~U();
  12   virtual int v() { return 2; }
  13 };
  14
  15 U::~U() {}
  16
  17 // CHECK-VPTR-MS: @__ubsan_vptr_type_cache = external dso_local
  18
  19 // ITANIUM: define{{.*}} i32 @_Z5get_vP1T
  20 // MSABI: define dso_local noundef i32 @"?get_v
  21 int get_v(T* t) {
  22   // First, we check that vtable is not loaded before a type check.
  23   // CHECK-NULL-NOT: load {{.*}} (ptr{{.*}})**, {{.*}} (ptr{{.*}})***
  24   // CHECK-NULL: [[UBSAN_CMP_RES:%[0-9]+]] = icmp ne ptr %{{[_a-z0-9]+}}, null
  25   // CHECK-NULL-NEXT: br i1 [[UBSAN_CMP_RES]], label %{{.*}}, label %{{.*}}
  26   // CHECK-NULL: call void @__ubsan_handle_type_mismatch_v1_abort
  27   // Second, we check that vtable is actually loaded once the type check is done.
  28   // CHECK-NULL: load ptr, ptr {{.*}}
  29   return t->v();
  30 }
  31
  32 // ITANIUM: define{{.*}} void @_Z9delete_itP1T
  33 // MSABI: define dso_local void @"?delete_it
  34 void delete_it(T *t) {
  35   // First, we check that vtable is not loaded before a type check.
  36   // CHECK-VPTR-NOT: load {{.*}} (ptr{{.*}})**, {{.*}} (ptr{{.*}})***
  37   // CHECK-VPTR: br i1 {{.*}} label %{{.*}}
  38   // CHECK-VPTR: call void @__ubsan_handle_dynamic_type_cache_miss_abort
  39   // Second, we check that vtable is actually loaded once the type check is done.
  40   // CHECK-VPTR: load ptr, ptr {{.*}}
  41   delete t;
  42 }
  43
  44 // ITANIUM: define{{.*}} ptr @_Z7dyncastP1T
  45 // MSABI: define dso_local noundef ptr @"?dyncast
  46 U* dyncast(T *t) {
  47   // First, we check that dynamic_cast is not called before a type check.
  48   // CHECK-VPTR-NOT: call ptr @__{{dynamic_cast|RTDynamicCast}}
  49   // CHECK-VPTR: br i1 {{.*}} label %{{.*}}
  50   // CHECK-VPTR: call void @__ubsan_handle_dynamic_type_cache_miss_abort
  51   // Second, we check that dynamic_cast is actually called once the type check is done.
  52   // CHECK-VPTR: call ptr @__{{dynamic_cast|RTDynamicCast}}
  53   return dynamic_cast<U*>(t);
  54 }