1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
|
// NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py
// 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
// 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>
#ifdef __cplusplus
extern "C" {
#endif
struct S {
int x, y;
};
// CHECK-LABEL: @get_offset_of_y_naively(
// CHECK-NEXT: entry:
// CHECK-NEXT: ret i64 ptrtoint (ptr getelementptr ([[STRUCT_S:%.*]], ptr null, i32 0, i32 1) to i64)
//
uintptr_t get_offset_of_y_naively(void) {
return ((uintptr_t)(&(((struct S *)0)->y)));
}
// CHECK-LABEL: @get_offset_of_y_via_builtin(
// CHECK-NEXT: entry:
// CHECK-NEXT: ret i64 4
//
uintptr_t get_offset_of_y_via_builtin(void) {
return __builtin_offsetof(struct S, y);
}
#ifdef __cplusplus
}
#endif
|
