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 {{.*}} (%struct.T*{{.*}})**, {{.*}} (%struct.T*{{.*}})*** 24 // CHECK-NULL: [[UBSAN_CMP_RES:%[0-9]+]] = icmp ne %struct.T* %{{[_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 {{.*}} (%struct.T*{{.*}})**, {{.*}} (%struct.T*{{.*}})*** 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 {{.*}} (%struct.T*{{.*}})**, {{.*}} (%struct.T*{{.*}})*** 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 {{.*}} (%struct.T*{{.*}})**, {{.*}} (%struct.T*{{.*}})*** 41 delete t; 42 } 43 44 // ITANIUM: define{{.*}} %struct.U* @_Z7dyncastP1T 45 // MSABI: define dso_local noundef %struct.U* @"?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 i8* @__{{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 i8* @__{{dynamic_cast|RTDynamicCast}} 53 return dynamic_cast<U*>(t); 54 } 55