25 lines
805 B
C++
25 lines
805 B
C++
|
// 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);
|
||
|
|
}
|