tools/testing/selftests/bpf/progs/btf_dump_test_case_packing.c

   1 // SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
   2
   3 /*
   4  * BTF-to-C dumper tests for struct packing determination.
   5  *
   6  * Copyright (c) 2019 Facebook
   7  */
   8 /* ----- START-EXPECTED-OUTPUT ----- */
   9 struct packed_trailing_space {
  10         int a;
  11         short b;
  12 } __attribute__((packed));
  13
  14 struct non_packed_trailing_space {
  15         int a;
  16         short b;
  17 };
  18
  19 struct packed_fields {
  20         short a;
  21         int b;
  22 } __attribute__((packed));
  23
  24 struct non_packed_fields {
  25         short a;
  26         int b;
  27 };
  28
  29 struct nested_packed {
  30         char: 4;
  31         int a: 4;
  32         long b;
  33         struct {
  34                 char c;
  35                 int d;
  36         } __attribute__((packed)) e;
  37 } __attribute__((packed));
  38
  39 union union_is_never_packed {
  40         int a: 4;
  41         char b;
  42         char c: 1;
  43 };
  44
  45 union union_does_not_need_packing {
  46         struct {
  47                 long a;
  48                 int b;
  49         } __attribute__((packed));
  50         int c;
  51 };
  52
  53 union jump_code_union {
  54         char code[5];
  55         struct {
  56                 char jump;
  57                 int offset;
  58         } __attribute__((packed));
  59 };
  60
  61 /* ----- START-EXPECTED-OUTPUT ----- */
  62 /*
  63  *struct nested_packed_but_aligned_struct {
  64  *      int x1;
  65  *      int x2;
  66  *};
  67  *
  68  *struct outer_implicitly_packed_struct {
  69  *      char y1;
  70  *      struct nested_packed_but_aligned_struct y2;
  71  *} __attribute__((packed));
  72  *
  73  */
  74 /* ------ END-EXPECTED-OUTPUT ------ */
  75
  76 struct nested_packed_but_aligned_struct {
  77         int x1;
  78         int x2;
  79 } __attribute__((packed));
  80
  81 struct outer_implicitly_packed_struct {
  82         char y1;
  83         struct nested_packed_but_aligned_struct y2;
  84 };
  85 /* ----- START-EXPECTED-OUTPUT ----- */
  86 /*
  87  *struct usb_ss_ep_comp_descriptor {
  88  *      char: 8;
  89  *      char bDescriptorType;
  90  *      char bMaxBurst;
  91  *      short wBytesPerInterval;
  92  *};
  93  *
  94  *struct usb_host_endpoint {
  95  *      long: 64;
  96  *      char: 8;
  97  *      struct usb_ss_ep_comp_descriptor ss_ep_comp;
  98  *      long: 0;
  99  *} __attribute__((packed));
 100  *
 101  */
 102 /* ------ END-EXPECTED-OUTPUT ------ */
 103
 104 struct usb_ss_ep_comp_descriptor {
 105         char: 8;
 106         char bDescriptorType;
 107         char bMaxBurst;
 108         int: 0;
 109         short wBytesPerInterval;
 110 } __attribute__((packed));
 111
 112 struct usb_host_endpoint {
 113         long: 64;
 114         char: 8;
 115         struct usb_ss_ep_comp_descriptor ss_ep_comp;
 116         long: 0;
 117 };
 118
 119 /* ----- START-EXPECTED-OUTPUT ----- */
 120 struct nested_packed_struct {
 121         int a;
 122         char b;
 123 } __attribute__((packed));
 124
 125 struct outer_nonpacked_struct {
 126         short a;
 127         struct nested_packed_struct b;
 128 };
 129
 130 struct outer_packed_struct {
 131         short a;
 132         struct nested_packed_struct b;
 133 } __attribute__((packed));
 134
 135 /* ------ END-EXPECTED-OUTPUT ------ */
 136
 137 int f(struct {
 138         struct packed_trailing_space _1;
 139         struct non_packed_trailing_space _2;
 140         struct packed_fields _3;
 141         struct non_packed_fields _4;
 142         struct nested_packed _5;
 143         union union_is_never_packed _6;
 144         union union_does_not_need_packing _7;
 145         union jump_code_union _8;
 146         struct outer_implicitly_packed_struct _9;
 147         struct usb_host_endpoint _10;
 148         struct outer_nonpacked_struct _11;
 149         struct outer_packed_struct _12;
 150 } *_)
 151 {
 152         return 0;
 153 }