| // RUN: %clang_cc1 -x c++ -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck %s |
| // RUN: %clang_cc1 -x c++ -fsanitize=pointer-overflow -fno-sanitize-recover=pointer-overflow -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck %s |
| |
| #include <stdint.h> |
| |
| struct S { |
| int x, y; |
| }; |
| |
| // CHECK-LABEL: define i64 @{{.*}}get_offset_of_y_naively{{.*}}( |
| uintptr_t get_offset_of_y_naively() { |
| // CHECK: [[ENTRY:.*]]: |
| // CHECK-NEXT: ret i64 ptrtoint (i32* getelementptr (i32, i32* null, i32 1) to i64) |
| // CHECK-NEXT: } |
| return ((uintptr_t)(&(((S *)nullptr)->y))); |
| } |
| |
| // CHECK-LABEL: define i64 @{{.*}}get_offset_of_y_via_builtin{{.*}}( |
| uintptr_t get_offset_of_y_via_builtin() { |
| // CHECK: [[ENTRY:.*]]: |
| // CHECK-NEXT: ret i64 4 |
| // CHECK-NEXT: } |
| return __builtin_offsetof(S, y); |
| } |
