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    // Copyright 2014-2015 The Rust Project Developers. See the COPYRIGHT
    // file at the top-level directory of this distribution and at
    // http://rust-lang.org/COPYRIGHT.
    //
    // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
    // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
    // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
    // option. This file may not be copied, modified, or distributed
    // except according to those terms.

    //! Unwind library interface

    #![allow(non_upper_case_globals)]
    #![allow(non_camel_case_types)]
    #![allow(non_snake_case)]
    #![allow(dead_code)] // these are just bindings

    #[cfg(any(not(target_arch = "arm"), target_os = "ios"))]
    pub use self::_Unwind_Action::*;
    #[cfg(target_arch = "arm")]
    pub use self::_Unwind_State::*;
    pub use self::_Unwind_Reason_Code::*;

    use libc;

    #[cfg(any(not(target_arch = "arm"), target_os = "ios"))]
    #[repr(C)]
    #[derive(Copy, Clone)]
    pub enum _Unwind_Action {
        _UA_SEARCH_PHASE = 1,
        _UA_CLEANUP_PHASE = 2,
        _UA_HANDLER_FRAME = 4,
        _UA_FORCE_UNWIND = 8,
        _UA_END_OF_STACK = 16,
    }

    #[cfg(target_arch = "arm")]
    #[repr(C)]
    #[derive(Copy, Clone)]
    pub enum _Unwind_State {
        _US_VIRTUAL_UNWIND_FRAME = 0,
        _US_UNWIND_FRAME_STARTING = 1,
        _US_UNWIND_FRAME_RESUME = 2,
        _US_ACTION_MASK = 3,
        _US_FORCE_UNWIND = 8,
        _US_END_OF_STACK = 16
    }

    #[repr(C)]
    #[derive(Copy, Clone)]
    pub enum _Unwind_Reason_Code {
        _URC_NO_REASON = 0,
        _URC_FOREIGN_EXCEPTION_CAUGHT = 1,
        _URC_FATAL_PHASE2_ERROR = 2,
        _URC_FATAL_PHASE1_ERROR = 3,
        _URC_NORMAL_STOP = 4,
        _URC_END_OF_STACK = 5,
        _URC_HANDLER_FOUND = 6,
        _URC_INSTALL_CONTEXT = 7,
        _URC_CONTINUE_UNWIND = 8,
        _URC_FAILURE = 9, // used only by ARM EABI
    }

    pub type _Unwind_Exception_Class = u64;

    pub type _Unwind_Word = libc::uintptr_t;

    #[cfg(target_arch = "x86")]
    pub const unwinder_private_data_size: usize = 5;

    #[cfg(target_arch = "x86_64")]
    pub const unwinder_private_data_size: usize = 6;

    #[cfg(all(target_arch = "arm", not(target_os = "ios")))]
    pub const unwinder_private_data_size: usize = 20;

    #[cfg(all(target_arch = "arm", target_os = "ios"))]
    pub const unwinder_private_data_size: usize = 5;

    #[cfg(target_arch = "aarch64")]
    pub const unwinder_private_data_size: usize = 2;

    #[cfg(any(target_arch = "mips", target_arch = "mipsel"))]
    pub const unwinder_private_data_size: usize = 2;

    #[cfg(any(target_arch = "powerpc", target_arch = "powerpc64",
              target_arch = "powerpc64le"))]
    pub const unwinder_private_data_size: usize = 2;

    #[repr(C)]
    pub struct _Unwind_Exception {
        pub exception_class: _Unwind_Exception_Class,
        pub exception_cleanup: _Unwind_Exception_Cleanup_Fn,
        pub private: [_Unwind_Word; unwinder_private_data_size],
    }

    pub enum _Unwind_Context {}

    pub type _Unwind_Exception_Cleanup_Fn =
            extern "C" fn(unwind_code: _Unwind_Reason_Code,
                          exception: *mut _Unwind_Exception);

    #[cfg_attr(any(all(target_os = "linux", not(target_env = "musl")),
                   target_os = "freebsd"),
               link(name = "gcc_s"))]
    #[cfg_attr(all(target_os = "linux", target_env = "musl", not(test)),
               link(name = "unwind", kind = "static"))]
    #[cfg_attr(any(target_os = "android", target_os = "openbsd"),
               link(name = "gcc"))]
    #[cfg_attr(all(target_os = "netbsd", not(target_vendor = "rumprun")),
               link(name = "gcc"))]
    #[cfg_attr(all(target_os = "netbsd", target_vendor = "rumprun"),
               link(name = "unwind"))]
    #[cfg_attr(target_os = "dragonfly",
               link(name = "gcc_pic"))]
    #[cfg_attr(target_os = "bitrig",
               link(name = "c++abi"))]
    #[cfg_attr(all(target_os = "windows", target_env="gnu"),
               link(name = "gcc_eh"))]
    extern "C" {
        // iOS on armv7 uses SjLj exceptions and requires to link
        // against corresponding routine (..._SjLj_...)
        #[cfg(not(all(target_os = "ios", target_arch = "arm")))]
        #[unwind]
        pub fn _Unwind_RaiseException(exception: *mut _Unwind_Exception)
                                      -> _Unwind_Reason_Code;

        #[cfg(all(target_os = "ios", target_arch = "arm"))]
        #[unwind]
        fn _Unwind_SjLj_RaiseException(e: *mut _Unwind_Exception)
                                       -> _Unwind_Reason_Code;

        pub fn _Unwind_DeleteException(exception: *mut _Unwind_Exception);

        #[unwind]
        pub fn _Unwind_Resume(exception: *mut _Unwind_Exception) -> !;
    }

    // ... and now we just providing access to SjLj counterspart
    // through a standard name to hide those details from others
    // (see also comment above regarding _Unwind_RaiseException)
    #[cfg(all(target_os = "ios", target_arch = "arm"))]
    #[inline(always)]
    pub unsafe fn _Unwind_RaiseException(exc: *mut _Unwind_Exception)
                                         -> _Unwind_Reason_Code {
        _Unwind_SjLj_RaiseException(exc)
    }

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