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#![doc(html_root_url = "https://sfackler.github.io/rstack/doc")]
#![allow(bad_style, improper_ctypes)] // x86_64 libunwind has empty structs before 1.2
use libc::{c_char, c_int, c_void, size_t};

pub use crate::native::*;
#[cfg(feature = "ptrace")]
pub use crate::ptrace::*;

#[cfg_attr(target_arch = "x86_64", path = "x86_64.rs")]
mod native;

#[cfg(feature = "ptrace")]
mod ptrace;

pub const UNW_ESUCCESS: c_int = 0;
pub const UNW_EUNSPEC: c_int = 1;
pub const UNW_ENOMEM: c_int = 2;
pub const UNW_EBADREG: c_int = 3;
pub const UNW_EREADONLYREG: c_int = 4;
pub const UNW_ESTOPUNWIND: c_int = 5;
pub const UNW_EINVALIDIP: c_int = 6;
pub const UNW_EBADFRAME: c_int = 7;
pub const UNW_EINVAL: c_int = 8;
pub const UNW_EBADVERSION: c_int = 9;
pub const UNW_ENOINFO: c_int = 10;

pub type unw_regnum_t = c_int;

pub enum unw_addr_space {}
pub type unw_addr_space_t = *mut unw_addr_space;

#[repr(C)]
pub enum unw_caching_policy_t {
    UNW_CACHE_NONE,
    UNW_CACHE_GLOBAL,
    UNW_CACHE_PER_THREAD,
}

#[repr(C)]
pub enum unw_save_loc_type_t {
    UNW_SLT_NONE,
    UNW_SLT_MEMORY,
    UNW_SLT_REG,
}

#[repr(C)]
#[derive(Copy, Clone)]
pub struct unw_cursor_t {
    pub opaque: [unw_word_t; UNW_TDEP_CURSOR_LEN as usize],
}

pub type unw_context_t = unw_tdep_context_t;

#[repr(C)]
#[derive(Copy, Clone)]
pub struct unw_proc_info_t {
    pub start_ip: unw_word_t,
    pub end_ip: unw_word_t,
    pub lsda: unw_word_t,
    pub handler: unw_word_t,
    pub gp: unw_word_t,
    pub flags: unw_word_t,
    pub format: c_int,
    pub unwind_info_size: c_int,
    pub unwind_info: *mut c_void,
    pub extra: unw_tdep_proc_info_t,
}

#[repr(C)]
pub struct unw_accessors_t {
    pub find_proc_info: Option<
        unsafe extern "C" fn(
            asp: unw_addr_space_t,
            ip: unw_word_t,
            pip: *mut unw_proc_info_t,
            need_unwind_info: c_int,
            arg: *mut c_void,
        ) -> c_int,
    >,
    pub put_unwind_info: Option<
        unsafe extern "C" fn(
            asp: unw_addr_space_t,
            pip: *mut unw_proc_info_t,
            arg: *mut c_void,
        ) -> c_void,
    >,
    pub get_dyn_info_list_addr: Option<
        unsafe extern "C" fn(
            asp: unw_addr_space_t,
            dilap: *mut unw_word_t,
            arg: *mut c_void,
        ) -> c_int,
    >,
    pub access_mem: Option<
        unsafe extern "C" fn(
            asp: unw_addr_space_t,
            addr: unw_word_t,
            valp: *mut unw_word_t,
            write: c_int,
            arg: *mut c_void,
        ) -> c_int,
    >,
    pub access_reg: Option<
        unsafe extern "C" fn(
            asp: unw_addr_space_t,
            regnum: unw_regnum_t,
            valp: *mut unw_word_t,
            write: c_int,
            arg: *mut c_void,
        ) -> c_int,
    >,
    // unw_fpreg_t is a long double :(
    access_fpreg: Option<unsafe extern "C" fn()>,
    pub resume: Option<
        unsafe extern "C" fn(
            asp: unw_addr_space_t,
            cp: *mut unw_cursor_t,
            arg: *mut c_void,
        ) -> c_int,
    >,
    pub get_proc_name: Option<
        unsafe extern "C" fn(
            asp: unw_addr_space_t,
            addr: unw_word_t,
            bufp: *mut c_char,
            buf_len: size_t,
            offp: *mut unw_word_t,
            arg: *mut c_void,
        ) -> c_int,
    >,
}

#[repr(C)]
pub union unw_save_loc_t_u {
    pub addr: unw_word_t,
    pub regnum: unw_regnum_t,
}

#[repr(C)]
pub struct unw_save_loc_t {
    pub type_: unw_save_loc_type_t,
    pub u: unw_save_loc_t_u,
    pub extra: unw_tdep_save_loc_t,
}

pub const UNW_REG_IP: c_int = UNW_TDEP_IP;
pub const UNW_REG_SP: c_int = UNW_TDEP_SP;
pub const UNW_REG_EH: c_int = UNW_TDEP_EH;
pub const UNW_REG_LAST: c_int = UNW_TDEP_LAST_REG;