root/tools/testing/selftests/bpf/progs/btf_dump_test_case_packing.c
// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)

/*
 * BTF-to-C dumper tests for struct packing determination.
 *
 * Copyright (c) 2019 Facebook
 */
/* ----- START-EXPECTED-OUTPUT ----- */
struct packed_trailing_space {
        int a;
        short b;
} __attribute__((packed));

struct non_packed_trailing_space {
        int a;
        short b;
};

struct packed_fields {
        short a;
        int b;
} __attribute__((packed));

struct non_packed_fields {
        short a;
        int b;
};

struct nested_packed {
        char: 4;
        int a: 4;
        long b;
        struct {
                char c;
                int d;
        } __attribute__((packed)) e;
} __attribute__((packed));

union union_is_never_packed {
        int a: 4;
        char b;
        char c: 1;
};

union union_does_not_need_packing {
        struct {
                long a;
                int b;
        } __attribute__((packed));
        int c;
};

union jump_code_union {
        char code[5];
        struct {
                char jump;
                int offset;
        } __attribute__((packed));
};

/* ----- START-EXPECTED-OUTPUT ----- */
/*
 *struct nested_packed_but_aligned_struct {
 *      int x1;
 *      int x2;
 *};
 *
 *struct outer_implicitly_packed_struct {
 *      char y1;
 *      struct nested_packed_but_aligned_struct y2;
 *} __attribute__((packed));
 *
 */
/* ------ END-EXPECTED-OUTPUT ------ */

struct nested_packed_but_aligned_struct {
        int x1;
        int x2;
} __attribute__((packed));

struct outer_implicitly_packed_struct {
        char y1;
        struct nested_packed_but_aligned_struct y2;
};
/* ----- START-EXPECTED-OUTPUT ----- */
/*
 *struct usb_ss_ep_comp_descriptor {
 *      char: 8;
 *      char bDescriptorType;
 *      char bMaxBurst;
 *      short wBytesPerInterval;
 *};
 *
 *struct usb_host_endpoint {
 *      long: 64;
 *      char: 8;
 *      struct usb_ss_ep_comp_descriptor ss_ep_comp;
 *      long: 0;
 *} __attribute__((packed));
 *
 */
/* ------ END-EXPECTED-OUTPUT ------ */

struct usb_ss_ep_comp_descriptor {
        char: 8;
        char bDescriptorType;
        char bMaxBurst;
        int: 0;
        short wBytesPerInterval;
} __attribute__((packed));

struct usb_host_endpoint {
        long: 64;
        char: 8;
        struct usb_ss_ep_comp_descriptor ss_ep_comp;
        long: 0;
};

/* ----- START-EXPECTED-OUTPUT ----- */
struct nested_packed_struct {
        int a;
        char b;
} __attribute__((packed));

struct outer_nonpacked_struct {
        short a;
        struct nested_packed_struct b;
};

struct outer_packed_struct {
        short a;
        struct nested_packed_struct b;
} __attribute__((packed));

/* ------ END-EXPECTED-OUTPUT ------ */

int f(struct {
        struct packed_trailing_space _1;
        struct non_packed_trailing_space _2;
        struct packed_fields _3;
        struct non_packed_fields _4;
        struct nested_packed _5;
        union union_is_never_packed _6;
        union union_does_not_need_packing _7;
        union jump_code_union _8;
        struct outer_implicitly_packed_struct _9;
        struct usb_host_endpoint _10;
        struct outer_nonpacked_struct _11;
        struct outer_packed_struct _12;
} *_)
{
        return 0;
}