clang/test/CodeGen/bpf-attr-preserve-access-index-7.c

// REQUIRES: bpf-registered-target
// RUN: %clang -target bpf -emit-llvm -S -g %s -o - | FileCheck %s

#define __reloc__ __attribute__((preserve_access_index))

// chain of records, all with attributes
struct __reloc__ s1;
struct __reloc__ s2;
struct __reloc__ s3;

struct s1 {
  int c;
};
typedef struct s1 __s1;

struct s2 {
  union {
    __s1 b[3];
  };
};
typedef struct s2 __s2;

struct s3 {
  __s2 a;
};
typedef struct s3 __s3;

int test(__s3 *arg) {
  return arg->a.b[2].c;
}

// CHECK: call %struct.s2* @llvm.preserve.struct.access.index.p0s_struct.s2s.p0s_struct.s3s(%struct.s3* %{{[0-9a-z]+}}, i32 0, i32 0)
// CHECK: call %union.anon* @llvm.preserve.struct.access.index.p0s_union.anons.p0s_struct.s2s(%struct.s2* %{{[0-9a-z]+}}, i32 0, i32 0)
// CHECK: call %union.anon* @llvm.preserve.union.access.index.p0s_union.anons.p0s_union.anons(%union.anon* %{{[0-9a-z]+}}, i32 0)
// CHECK: call %struct.s1* @llvm.preserve.array.access.index.p0s_struct.s1s.p0a3s_struct.s1s([3 x %struct.s1]* %{{[0-9a-z]+}}, i32 1, i32 2)
// CHECK: call i32* @llvm.preserve.struct.access.index.p0i32.p0s_struct.s1s(%struct.s1* %{{[0-9a-z]+}}, i32 0, i32 0)