| // RUN: %clang_cc1 -fcatch-undefined-behavior -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck %s |
| |
| // CHECK: @_Z17reference_binding |
| void reference_binding(int *p) { |
| // C++ core issue 453: If an lvalue to which a reference is directly bound |
| // designates neither an existing object or function of an appropriate type, |
| // nor a region of storage of suitable size and alignment to contain an object |
| // of the reference's type, the behavior is undefined. |
| |
| // CHECK: icmp ne {{.*}}, null |
| |
| // CHECK: %[[SIZE:.*]] = call i64 @llvm.objectsize.i64 |
| // CHECK-NEXT: icmp uge i64 %[[SIZE]], 4 |
| |
| // CHECK: %[[PTRINT:.*]] = ptrtoint |
| // CHECK-NEXT: %[[MISALIGN:.*]] = and i64 %[[PTRINT]], 3 |
| // CHECK-NEXT: icmp eq i64 %[[MISALIGN]], 0 |
| int &r = *p; |
| } |
| |
| struct S { |
| double d; |
| int a, b; |
| virtual int f(); |
| }; |
| |
| // CHECK: @_Z13member_access |
| void member_access(S *p) { |
| // (1) Check 'p' is appropriately sized and aligned for member access. |
| |
| // FIXME: Check vptr is for 'S' or a class derived from 'S'. |
| |
| // CHECK: icmp ne {{.*}}, null |
| |
| // CHECK: %[[SIZE:.*]] = call i64 @llvm.objectsize.i64 |
| // CHECK-NEXT: icmp uge i64 %[[SIZE]], 24 |
| |
| // CHECK: %[[PTRINT:.*]] = ptrtoint |
| // CHECK-NEXT: %[[MISALIGN:.*]] = and i64 %[[PTRINT]], 7 |
| // CHECK-NEXT: icmp eq i64 %[[MISALIGN]], 0 |
| |
| // (2) Check 'p->b' is appropriately sized and aligned for a load. |
| |
| // FIXME: Suppress this in the trivial case of a member access, because we |
| // know we've just checked the member access expression itself. |
| |
| // CHECK: %[[SIZE:.*]] = call i64 @llvm.objectsize.i64 |
| // CHECK-NEXT: icmp uge i64 %[[SIZE]], 4 |
| |
| // CHECK: %[[PTRINT:.*]] = ptrtoint |
| // CHECK-NEXT: %[[MISALIGN:.*]] = and i64 %[[PTRINT]], 3 |
| // CHECK-NEXT: icmp eq i64 %[[MISALIGN]], 0 |
| int k = p->b; |
| |
| // (3) Check 'p' is appropriately sized and aligned for member function call. |
| |
| // FIXME: Check vptr is for 'S' or a class derived from 'S'. |
| |
| // CHECK: icmp ne {{.*}}, null |
| |
| // CHECK: %[[SIZE:.*]] = call i64 @llvm.objectsize.i64 |
| // CHECK-NEXT: icmp uge i64 %[[SIZE]], 24 |
| |
| // CHECK: %[[PTRINT:.*]] = ptrtoint |
| // CHECK-NEXT: %[[MISALIGN:.*]] = and i64 %[[PTRINT]], 7 |
| // CHECK-NEXT: icmp eq i64 %[[MISALIGN]], 0 |
| k = p->f(); |
| } |
| |
| // CHECK: @_Z12lsh_overflow |
| int lsh_overflow(int a, int b) { |
| // CHECK: %[[INBOUNDS:.*]] = icmp ule i32 %[[RHS:.*]], 31 |
| // CHECK-NEXT: br i1 %[[INBOUNDS]] |
| |
| // CHECK: %[[SHIFTED_OUT_WIDTH:.*]] = sub nuw nsw i32 31, %[[RHS]] |
| // CHECK-NEXT: %[[SHIFTED_OUT:.*]] = lshr i32 %[[LHS:.*]], %[[SHIFTED_OUT_WIDTH]] |
| |
| // This is present for C++11 but not for C: C++ core issue 1457 allows a '1' |
| // to be shifted into the sign bit, but not out of it. |
| // CHECK-NEXT: %[[SHIFTED_OUT_NOT_SIGN:.*]] = lshr i32 %[[SHIFTED_OUT]], 1 |
| |
| // CHECK-NEXT: %[[NO_OVERFLOW:.*]] = icmp eq i32 %[[SHIFTED_OUT_NOT_SIGN]], 0 |
| // CHECK-NEXT: br i1 %[[NO_OVERFLOW]] |
| |
| // CHECK: %[[RET:.*]] = shl i32 %[[LHS]], %[[RHS]] |
| // CHECK-NEXT: ret i32 %[[RET]] |
| return a << b; |
| } |
| |
| // CHECK: @_Z9no_return |
| int no_return() { |
| // CHECK: call void @__ubsan_handle_missing_return(i8* bitcast ({{.*}}* @{{.*}} to i8*)) noreturn nounwind |
| // CHECK-NEXT: unreachable |
| } |