[rustc.git] / library / unwind / src / libunwind.rs

#![allow(nonstandard_style)]

use libc::{c_int, c_void, uintptr_t};

#[repr(C)]
#[derive(Debug, Copy, Clone, PartialEq)]
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 EHABI
}
pub use _Unwind_Reason_Code::*;

pub type _Unwind_Exception_Class = u64;
pub type _Unwind_Word = uintptr_t;
pub type _Unwind_Ptr = uintptr_t;
pub type _Unwind_Trace_Fn =
    extern "C" fn(ctx: *mut _Unwind_Context, arg: *mut c_void) -> _Unwind_Reason_Code;

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

#[cfg(all(target_arch = "x86_64", not(target_os = "windows")))]
pub const unwinder_private_data_size: usize = 2;

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

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

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

#[cfg(all(target_arch = "aarch64", target_pointer_width = "64", not(target_os = "windows")))]
pub const unwinder_private_data_size: usize = 2;

#[cfg(all(target_arch = "aarch64", target_pointer_width = "64", target_os = "windows"))]
pub const unwinder_private_data_size: usize = 6;

#[cfg(all(target_arch = "aarch64", target_pointer_width = "32"))]
pub const unwinder_private_data_size: usize = 5;

#[cfg(target_arch = "m68k")]
pub const unwinder_private_data_size: usize = 2;

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

#[cfg(target_arch = "mips64")]
pub const unwinder_private_data_size: usize = 2;

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

#[cfg(target_arch = "s390x")]
pub const unwinder_private_data_size: usize = 2;

#[cfg(any(target_arch = "sparc", target_arch = "sparc64"))]
pub const unwinder_private_data_size: usize = 2;

#[cfg(any(target_arch = "riscv64", target_arch = "riscv32"))]
pub const unwinder_private_data_size: usize = 2;

#[cfg(target_os = "emscripten")]
pub const unwinder_private_data_size: usize = 20;

#[cfg(all(target_arch = "hexagon", target_os = "linux"))]
pub const unwinder_private_data_size: usize = 35;

#[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);

// FIXME: The `#[link]` attributes on `extern "C"` block marks those symbols declared in
// the block are reexported in dylib build of std. This is needed when build rustc with
// feature `llvm-libunwind', as no other cdylib will provided those _Unwind_* symbols.
// However the `link` attribute is duplicated multiple times and does not just export symbol,
// a better way to manually export symbol would be another attribute like `#[export]`.
// See the logic in function rustc_codegen_ssa::src::back::exported_symbols, module
// rustc_codegen_ssa::src::back::symbol_export, rustc_middle::middle::exported_symbols
// and RFC 2841
#[cfg_attr(
    any(
        all(feature = "llvm-libunwind", any(target_os = "fuchsia", target_os = "linux")),
        all(target_os = "windows", target_env = "gnu", target_abi = "llvm")
    ),
    link(name = "unwind", kind = "static", modifiers = "-bundle")
)]
extern "C-unwind" {
    pub fn _Unwind_Resume(exception: *mut _Unwind_Exception) -> !;
}
extern "C" {
    pub fn _Unwind_DeleteException(exception: *mut _Unwind_Exception);
    pub fn _Unwind_GetLanguageSpecificData(ctx: *mut _Unwind_Context) -> *mut c_void;
    pub fn _Unwind_GetRegionStart(ctx: *mut _Unwind_Context) -> _Unwind_Ptr;
    pub fn _Unwind_GetTextRelBase(ctx: *mut _Unwind_Context) -> _Unwind_Ptr;
    pub fn _Unwind_GetDataRelBase(ctx: *mut _Unwind_Context) -> _Unwind_Ptr;
}

cfg_if::cfg_if! {
if #[cfg(any(target_os = "ios", target_os = "watchos", target_os = "netbsd", not(target_arch = "arm")))] {
    // Not ARM EHABI
    #[repr(C)]
    #[derive(Copy, Clone, PartialEq)]
    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,
    }
    pub use _Unwind_Action::*;

    #[cfg_attr(
        all(feature = "llvm-libunwind", any(target_os = "fuchsia", target_os = "linux")),
        link(name = "unwind", kind = "static", modifiers = "-bundle")
    )]
    extern "C" {
        pub fn _Unwind_GetGR(ctx: *mut _Unwind_Context, reg_index: c_int) -> _Unwind_Word;
        pub fn _Unwind_SetGR(ctx: *mut _Unwind_Context, reg_index: c_int, value: _Unwind_Word);
        pub fn _Unwind_GetIP(ctx: *mut _Unwind_Context) -> _Unwind_Word;
        pub fn _Unwind_SetIP(ctx: *mut _Unwind_Context, value: _Unwind_Word);
        pub fn _Unwind_GetIPInfo(ctx: *mut _Unwind_Context, ip_before_insn: *mut c_int)
                                 -> _Unwind_Word;
        pub fn _Unwind_FindEnclosingFunction(pc: *mut c_void) -> *mut c_void;
    }

} else {
    // ARM EHABI
    #[repr(C)]
    #[derive(Copy, Clone, PartialEq)]
    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,
    }
    pub use _Unwind_State::*;

    #[repr(C)]
    enum _Unwind_VRS_Result {
        _UVRSR_OK = 0,
        _UVRSR_NOT_IMPLEMENTED = 1,
        _UVRSR_FAILED = 2,
    }
    #[repr(C)]
    enum _Unwind_VRS_RegClass {
        _UVRSC_CORE = 0,
        _UVRSC_VFP = 1,
        _UVRSC_FPA = 2,
        _UVRSC_WMMXD = 3,
        _UVRSC_WMMXC = 4,
    }
    use _Unwind_VRS_RegClass::*;
    #[repr(C)]
    enum _Unwind_VRS_DataRepresentation {
        _UVRSD_UINT32 = 0,
        _UVRSD_VFPX = 1,
        _UVRSD_FPAX = 2,
        _UVRSD_UINT64 = 3,
        _UVRSD_FLOAT = 4,
        _UVRSD_DOUBLE = 5,
    }
    use _Unwind_VRS_DataRepresentation::*;

    pub const UNWIND_POINTER_REG: c_int = 12;
    pub const UNWIND_SP_REG: c_int = 13;
    pub const UNWIND_IP_REG: c_int = 15;

    #[cfg_attr(
        all(feature = "llvm-libunwind", any(target_os = "fuchsia", target_os = "linux")),
        link(name = "unwind", kind = "static", modifiers = "-bundle")
    )]
    extern "C" {
        fn _Unwind_VRS_Get(ctx: *mut _Unwind_Context,
                           regclass: _Unwind_VRS_RegClass,
                           regno: _Unwind_Word,
                           repr: _Unwind_VRS_DataRepresentation,
                           data: *mut c_void)
                           -> _Unwind_VRS_Result;

        fn _Unwind_VRS_Set(ctx: *mut _Unwind_Context,
                           regclass: _Unwind_VRS_RegClass,
                           regno: _Unwind_Word,
                           repr: _Unwind_VRS_DataRepresentation,
                           data: *mut c_void)
                           -> _Unwind_VRS_Result;
    }

    // On Android or ARM/Linux, these are implemented as macros:

    pub unsafe fn _Unwind_GetGR(ctx: *mut _Unwind_Context, reg_index: c_int) -> _Unwind_Word {
        let mut val: _Unwind_Word = 0;
        _Unwind_VRS_Get(ctx, _UVRSC_CORE, reg_index as _Unwind_Word, _UVRSD_UINT32,
                        &mut val as *mut _ as *mut c_void);
        val
    }

    pub unsafe fn _Unwind_SetGR(ctx: *mut _Unwind_Context, reg_index: c_int, value: _Unwind_Word) {
        let mut value = value;
        _Unwind_VRS_Set(ctx, _UVRSC_CORE, reg_index as _Unwind_Word, _UVRSD_UINT32,
                        &mut value as *mut _ as *mut c_void);
    }

    pub unsafe fn _Unwind_GetIP(ctx: *mut _Unwind_Context)
                                -> _Unwind_Word {
        let val = _Unwind_GetGR(ctx, UNWIND_IP_REG);
        (val & !1) as _Unwind_Word
    }

    pub unsafe fn _Unwind_SetIP(ctx: *mut _Unwind_Context,
                                value: _Unwind_Word) {
        // Propagate thumb bit to instruction pointer
        let thumb_state = _Unwind_GetGR(ctx, UNWIND_IP_REG) & 1;
        let value = value | thumb_state;
        _Unwind_SetGR(ctx, UNWIND_IP_REG, value);
    }

    pub unsafe fn _Unwind_GetIPInfo(ctx: *mut _Unwind_Context,
                                    ip_before_insn: *mut c_int)
                                    -> _Unwind_Word {
        *ip_before_insn = 0;
        _Unwind_GetIP(ctx)
    }

    // This function also doesn't exist on Android or ARM/Linux, so make it a no-op
    pub unsafe fn _Unwind_FindEnclosingFunction(pc: *mut c_void) -> *mut c_void {
        pc
    }
}
} // cfg_if!

cfg_if::cfg_if! {
if #[cfg(not(all(target_os = "ios", target_arch = "arm")))] {
    // Not 32-bit iOS
    #[cfg_attr(
        all(feature = "llvm-libunwind", any(target_os = "fuchsia", target_os = "linux")),
        link(name = "unwind", kind = "static", modifiers = "-bundle")
    )]
    extern "C-unwind" {
        pub fn _Unwind_RaiseException(exception: *mut _Unwind_Exception) -> _Unwind_Reason_Code;
    }
    #[cfg_attr(
        all(feature = "llvm-libunwind", any(target_os = "fuchsia", target_os = "linux")),
        link(name = "unwind", kind = "static", modifiers = "-bundle")
    )]
    extern "C" {
        pub fn _Unwind_Backtrace(trace: _Unwind_Trace_Fn,
                                 trace_argument: *mut c_void)
                                 -> _Unwind_Reason_Code;
    }
} else {
    // 32-bit iOS uses SjLj and does not provide _Unwind_Backtrace()
    extern "C-unwind" {
        pub fn _Unwind_SjLj_RaiseException(e: *mut _Unwind_Exception) -> _Unwind_Reason_Code;
    }

    pub use _Unwind_SjLj_RaiseException as _Unwind_RaiseException;
}
} // cfg_if!

cfg_if::cfg_if! {
if #[cfg(all(windows, any(target_arch = "aarch64", target_arch = "x86_64"), target_env = "gnu"))] {
    // We declare these as opaque types. This is fine since you just need to
    // pass them to _GCC_specific_handler and forget about them.
    pub enum EXCEPTION_RECORD {}
    pub type LPVOID = *mut c_void;
    pub enum CONTEXT {}
    pub enum DISPATCHER_CONTEXT {}
    pub type EXCEPTION_DISPOSITION = c_int;
    type PersonalityFn = unsafe extern "C" fn(version: c_int,
                                              actions: _Unwind_Action,
                                              exception_class: _Unwind_Exception_Class,
                                              exception_object: *mut _Unwind_Exception,
                                              context: *mut _Unwind_Context)
                                              -> _Unwind_Reason_Code;

    extern "C" {
        pub fn _GCC_specific_handler(exceptionRecord: *mut EXCEPTION_RECORD,
                                establisherFrame: LPVOID,
                                contextRecord: *mut CONTEXT,
                                dispatcherContext: *mut DISPATCHER_CONTEXT,
                                personality: PersonalityFn)
                                -> EXCEPTION_DISPOSITION;
    }
}
} // cfg_if!
Commit	Line	Data
b7449926	1	#![allow(nonstandard_style)]
1a4d82fc	2
5bcae85e	3	use libc::{c_int, c_void, uintptr_t};
1a4d82fc JJ	4
1a4d82fc JJ	5	#[repr(C)]
8bb4bdeb	6	#[derive(Debug, Copy, Clone, PartialEq)]
1a4d82fc JJ	7	pub enum _Unwind_Reason_Code {
	8	_URC_NO_REASON = 0,
	9	_URC_FOREIGN_EXCEPTION_CAUGHT = 1,
	10	_URC_FATAL_PHASE2_ERROR = 2,
	11	_URC_FATAL_PHASE1_ERROR = 3,
	12	_URC_NORMAL_STOP = 4,
	13	_URC_END_OF_STACK = 5,
	14	_URC_HANDLER_FOUND = 6,
	15	_URC_INSTALL_CONTEXT = 7,
	16	_URC_CONTINUE_UNWIND = 8,
5bcae85e	17	_URC_FAILURE = 9, // used only by ARM EHABI
1a4d82fc	18	}
9fa01778	19	pub use _Unwind_Reason_Code::*;
1a4d82fc JJ	20
1a4d82fc JJ	21	pub type _Unwind_Exception_Class = u64;
5bcae85e SL	22	pub type _Unwind_Word = uintptr_t;
5bcae85e SL	23	pub type _Unwind_Ptr = uintptr_t;
dfeec247 XL	24	pub type _Unwind_Trace_Fn =
	25	extern "C" fn(ctx: mut _Unwind_Context, arg: mut c_void) -> _Unwind_Reason_Code;
	26
1a4d82fc	27	#[cfg(target_arch = "x86")]
c34b1796	28	pub const unwinder_private_data_size: usize = 5;
1a4d82fc	29
6522a427 EL	30	#[cfg(all(target_arch = "x86_64", not(target_os = "windows")))]
	31	pub const unwinder_private_data_size: usize = 2;
	32
	33	#[cfg(all(target_arch = "x86_64", target_os = "windows"))]
c34b1796	34	pub const unwinder_private_data_size: usize = 6;
1a4d82fc	35
064997fb	36	#[cfg(all(target_arch = "arm", not(any(target_os = "ios", target_os = "watchos"))))]
c34b1796	37	pub const unwinder_private_data_size: usize = 20;
1a4d82fc	38
064997fb	39	#[cfg(all(target_arch = "arm", any(target_os = "ios", target_os = "watchos")))]
c34b1796	40	pub const unwinder_private_data_size: usize = 5;
1a4d82fc	41
6522a427	42	#[cfg(all(target_arch = "aarch64", target_pointer_width = "64", not(target_os = "windows")))]
c34b1796	43	pub const unwinder_private_data_size: usize = 2;
1a4d82fc	44
6522a427 EL	45	#[cfg(all(target_arch = "aarch64", target_pointer_width = "64", target_os = "windows"))]
	46	pub const unwinder_private_data_size: usize = 6;
	47
5869c6ff XL	48	#[cfg(all(target_arch = "aarch64", target_pointer_width = "32"))]
	49	pub const unwinder_private_data_size: usize = 5;
	50
5099ac24 FG	51	#[cfg(target_arch = "m68k")]
	52	pub const unwinder_private_data_size: usize = 2;
	53
7453a54e	54	#[cfg(target_arch = "mips")]
c34b1796	55	pub const unwinder_private_data_size: usize = 2;
1a4d82fc	56
9e0c209e SL	57	#[cfg(target_arch = "mips64")]
	58	pub const unwinder_private_data_size: usize = 2;
	59
7453a54e	60	#[cfg(any(target_arch = "powerpc", target_arch = "powerpc64"))]
c34b1796	61	pub const unwinder_private_data_size: usize = 2;
85aaf69f	62
9e0c209e SL	63	#[cfg(target_arch = "s390x")]
	64	pub const unwinder_private_data_size: usize = 2;
	65
1b1a35ee	66	#[cfg(any(target_arch = "sparc", target_arch = "sparc64"))]
32a655c1 SL	67	pub const unwinder_private_data_size: usize = 2;
32a655c1 SL	68
1b1a35ee	69	#[cfg(any(target_arch = "riscv64", target_arch = "riscv32"))]
dfeec247 XL	70	pub const unwinder_private_data_size: usize = 2;
dfeec247 XL	71
c30ab7b3	72	#[cfg(target_os = "emscripten")]
7453a54e SL	73	pub const unwinder_private_data_size: usize = 20;
7453a54e SL	74
416331ca XL	75	#[cfg(all(target_arch = "hexagon", target_os = "linux"))]
	76	pub const unwinder_private_data_size: usize = 35;
	77
1a4d82fc JJ	78	#[repr(C)]
	79	pub struct _Unwind_Exception {
	80	pub exception_class: _Unwind_Exception_Class,
	81	pub exception_cleanup: _Unwind_Exception_Cleanup_Fn,
	82	pub private: [_Unwind_Word; unwinder_private_data_size],
	83	}
	84
	85	pub enum _Unwind_Context {}
	86
dfeec247 XL	87	pub type _Unwind_Exception_Cleanup_Fn =
dfeec247 XL	88	extern "C" fn(unwind_code: _Unwind_Reason_Code, exception: *mut _Unwind_Exception);
94222f64 XL	89
94222f64 XL	90	// FIXME: The `#[link]` attributes on `extern "C"` block marks those symbols declared in
6522a427	91	// the block are reexported in dylib build of std. This is needed when build rustc with
94222f64 XL	92	// feature `llvm-libunwind', as no other cdylib will provided those _Unwind_* symbols.
	93	// However the `link` attribute is duplicated multiple times and does not just export symbol,
	94	// a better way to manually export symbol would be another attribute like `#[export]`.
	95	// See the logic in function rustc_codegen_ssa::src::back::exported_symbols, module
	96	// rustc_codegen_ssa::src::back::symbol_export, rustc_middle::middle::exported_symbols
	97	// and RFC 2841
dfeec247	98	#[cfg_attr(
6522a427 EL	99	any(
	100	all(feature = "llvm-libunwind", any(target_os = "fuchsia", target_os = "linux")),
	101	all(target_os = "windows", target_env = "gnu", target_abi = "llvm")
	102	),
94222f64	103	link(name = "unwind", kind = "static", modifiers = "-bundle")
dfeec247	104	)]
94222f64	105	extern "C-unwind" {
5bcae85e	106	pub fn _Unwind_Resume(exception: *mut _Unwind_Exception) -> !;
94222f64 XL	107	}
94222f64 XL	108	extern "C" {
1a4d82fc	109	pub fn _Unwind_DeleteException(exception: *mut _Unwind_Exception);
5bcae85e SL	110	pub fn _Unwind_GetLanguageSpecificData(ctx: mut _Unwind_Context) -> mut c_void;
	111	pub fn _Unwind_GetRegionStart(ctx: *mut _Unwind_Context) -> _Unwind_Ptr;
	112	pub fn _Unwind_GetTextRelBase(ctx: *mut _Unwind_Context) -> _Unwind_Ptr;
	113	pub fn _Unwind_GetDataRelBase(ctx: *mut _Unwind_Context) -> _Unwind_Ptr;
	114	}
92a42be0	115
dc9dc135	116	cfg_if::cfg_if! {
064997fb	117	if #[cfg(any(target_os = "ios", target_os = "watchos", target_os = "netbsd", not(target_arch = "arm")))] {
5bcae85e SL	118	// Not ARM EHABI
	119	#[repr(C)]
	120	#[derive(Copy, Clone, PartialEq)]
	121	pub enum _Unwind_Action {
	122	_UA_SEARCH_PHASE = 1,
	123	_UA_CLEANUP_PHASE = 2,
	124	_UA_HANDLER_FRAME = 4,
	125	_UA_FORCE_UNWIND = 8,
	126	_UA_END_OF_STACK = 16,
	127	}
9fa01778	128	pub use _Unwind_Action::*;
a7813a04	129
94222f64 XL	130	#[cfg_attr(
	131	all(feature = "llvm-libunwind", any(target_os = "fuchsia", target_os = "linux")),
	132	link(name = "unwind", kind = "static", modifiers = "-bundle")
	133	)]
5bcae85e SL	134	extern "C" {
	135	pub fn _Unwind_GetGR(ctx: *mut _Unwind_Context, reg_index: c_int) -> _Unwind_Word;
	136	pub fn _Unwind_SetGR(ctx: *mut _Unwind_Context, reg_index: c_int, value: _Unwind_Word);
	137	pub fn _Unwind_GetIP(ctx: *mut _Unwind_Context) -> _Unwind_Word;
	138	pub fn _Unwind_SetIP(ctx: *mut _Unwind_Context, value: _Unwind_Word);
	139	pub fn _Unwind_GetIPInfo(ctx: mut _Unwind_Context, ip_before_insn: mut c_int)
	140	-> _Unwind_Word;
	141	pub fn _Unwind_FindEnclosingFunction(pc: mut c_void) -> mut c_void;
	142	}
1a4d82fc	143
5bcae85e SL	144	} else {
	145	// ARM EHABI
	146	#[repr(C)]
	147	#[derive(Copy, Clone, PartialEq)]
	148	pub enum _Unwind_State {
	149	_US_VIRTUAL_UNWIND_FRAME = 0,
	150	_US_UNWIND_FRAME_STARTING = 1,
	151	_US_UNWIND_FRAME_RESUME = 2,
	152	_US_ACTION_MASK = 3,
	153	_US_FORCE_UNWIND = 8,
	154	_US_END_OF_STACK = 16,
	155	}
9fa01778	156	pub use _Unwind_State::*;
a7813a04	157
a7813a04 XL	158	#[repr(C)]
	159	enum _Unwind_VRS_Result {
	160	_UVRSR_OK = 0,
	161	_UVRSR_NOT_IMPLEMENTED = 1,
	162	_UVRSR_FAILED = 2,
	163	}
	164	#[repr(C)]
	165	enum _Unwind_VRS_RegClass {
	166	_UVRSC_CORE = 0,
	167	_UVRSC_VFP = 1,
	168	_UVRSC_FPA = 2,
	169	_UVRSC_WMMXD = 3,
	170	_UVRSC_WMMXC = 4,
	171	}
9fa01778	172	use _Unwind_VRS_RegClass::*;
a7813a04 XL	173	#[repr(C)]
	174	enum _Unwind_VRS_DataRepresentation {
	175	_UVRSD_UINT32 = 0,
	176	_UVRSD_VFPX = 1,
	177	_UVRSD_FPAX = 2,
	178	_UVRSD_UINT64 = 3,
	179	_UVRSD_FLOAT = 4,
	180	_UVRSD_DOUBLE = 5,
	181	}
9fa01778	182	use _Unwind_VRS_DataRepresentation::*;
5bcae85e SL	183
5bcae85e SL	184	pub const UNWIND_POINTER_REG: c_int = 12;
dfeec247	185	pub const UNWIND_SP_REG: c_int = 13;
5bcae85e	186	pub const UNWIND_IP_REG: c_int = 15;
a7813a04	187
94222f64 XL	188	#[cfg_attr(
	189	all(feature = "llvm-libunwind", any(target_os = "fuchsia", target_os = "linux")),
	190	link(name = "unwind", kind = "static", modifiers = "-bundle")
	191	)]
3157f602	192	extern "C" {
a7813a04	193	fn _Unwind_VRS_Get(ctx: *mut _Unwind_Context,
5bcae85e SL	194	regclass: _Unwind_VRS_RegClass,
5bcae85e SL	195	regno: _Unwind_Word,
a7813a04	196	repr: _Unwind_VRS_DataRepresentation,
5bcae85e SL	197	data: *mut c_void)
	198	-> _Unwind_VRS_Result;
	199
	200	fn _Unwind_VRS_Set(ctx: *mut _Unwind_Context,
	201	regclass: _Unwind_VRS_RegClass,
	202	regno: _Unwind_Word,
	203	repr: _Unwind_VRS_DataRepresentation,
	204	data: *mut c_void)
3157f602	205	-> _Unwind_VRS_Result;
a7813a04 XL	206	}
a7813a04 XL	207
5bcae85e SL	208	// On Android or ARM/Linux, these are implemented as macros:
	209
	210	pub unsafe fn _Unwind_GetGR(ctx: *mut _Unwind_Context, reg_index: c_int) -> _Unwind_Word {
	211	let mut val: _Unwind_Word = 0;
	212	_Unwind_VRS_Get(ctx, _UVRSC_CORE, reg_index as _Unwind_Word, _UVRSD_UINT32,
	213	&mut val as mut _ as mut c_void);
	214	val
	215	}
	216
	217	pub unsafe fn _Unwind_SetGR(ctx: *mut _Unwind_Context, reg_index: c_int, value: _Unwind_Word) {
	218	let mut value = value;
	219	_Unwind_VRS_Set(ctx, _UVRSC_CORE, reg_index as _Unwind_Word, _UVRSD_UINT32,
	220	&mut value as mut _ as mut c_void);
	221	}
	222
	223	pub unsafe fn _Unwind_GetIP(ctx: *mut _Unwind_Context)
	224	-> _Unwind_Word {
	225	let val = _Unwind_GetGR(ctx, UNWIND_IP_REG);
	226	(val & !1) as _Unwind_Word
	227	}
a7813a04	228
5bcae85e SL	229	pub unsafe fn _Unwind_SetIP(ctx: *mut _Unwind_Context,
	230	value: _Unwind_Word) {
	231	// Propagate thumb bit to instruction pointer
	232	let thumb_state = _Unwind_GetGR(ctx, UNWIND_IP_REG) & 1;
	233	let value = value \| thumb_state;
	234	_Unwind_SetGR(ctx, UNWIND_IP_REG, value);
	235	}
	236
	237	pub unsafe fn _Unwind_GetIPInfo(ctx: *mut _Unwind_Context,
	238	ip_before_insn: *mut c_int)
	239	-> _Unwind_Word {
	240	*ip_before_insn = 0;
	241	_Unwind_GetIP(ctx)
	242	}
	243
	244	// This function also doesn't exist on Android or ARM/Linux, so make it a no-op
	245	pub unsafe fn _Unwind_FindEnclosingFunction(pc: mut c_void) -> mut c_void {
	246	pc
	247	}
a7813a04	248	}
dc9dc135	249	} // cfg_if!
a7813a04	250
dc9dc135	251	cfg_if::cfg_if! {
5bcae85e SL	252	if #[cfg(not(all(target_os = "ios", target_arch = "arm")))] {
5bcae85e SL	253	// Not 32-bit iOS
94222f64 XL	254	#[cfg_attr(
	255	all(feature = "llvm-libunwind", any(target_os = "fuchsia", target_os = "linux")),
	256	link(name = "unwind", kind = "static", modifiers = "-bundle")
	257	)]
	258	extern "C-unwind" {
5bcae85e	259	pub fn _Unwind_RaiseException(exception: *mut _Unwind_Exception) -> _Unwind_Reason_Code;
94222f64	260	}
5e7ed085 FG	261	#[cfg_attr(
	262	all(feature = "llvm-libunwind", any(target_os = "fuchsia", target_os = "linux")),
	263	link(name = "unwind", kind = "static", modifiers = "-bundle")
	264	)]
94222f64	265	extern "C" {
5bcae85e SL	266	pub fn _Unwind_Backtrace(trace: _Unwind_Trace_Fn,
	267	trace_argument: *mut c_void)
	268	-> _Unwind_Reason_Code;
	269	}
	270	} else {
	271	// 32-bit iOS uses SjLj and does not provide _Unwind_Backtrace()
94222f64	272	extern "C-unwind" {
5bcae85e SL	273	pub fn _Unwind_SjLj_RaiseException(e: *mut _Unwind_Exception) -> _Unwind_Reason_Code;
	274	}
	275
923072b8	276	pub use _Unwind_SjLj_RaiseException as _Unwind_RaiseException;
a7813a04	277	}
5bcae85e	278	} // cfg_if!
e74abb32 XL	279
e74abb32 XL	280	cfg_if::cfg_if! {
6522a427	281	if #[cfg(all(windows, any(target_arch = "aarch64", target_arch = "x86_64"), target_env = "gnu"))] {
e74abb32 XL	282	// We declare these as opaque types. This is fine since you just need to
	283	// pass them to _GCC_specific_handler and forget about them.
	284	pub enum EXCEPTION_RECORD {}
	285	pub type LPVOID = *mut c_void;
	286	pub enum CONTEXT {}
	287	pub enum DISPATCHER_CONTEXT {}
	288	pub type EXCEPTION_DISPOSITION = c_int;
	289	type PersonalityFn = unsafe extern "C" fn(version: c_int,
	290	actions: _Unwind_Action,
	291	exception_class: _Unwind_Exception_Class,
	292	exception_object: *mut _Unwind_Exception,
	293	context: *mut _Unwind_Context)
	294	-> _Unwind_Reason_Code;
	295
	296	extern "C" {
	297	pub fn _GCC_specific_handler(exceptionRecord: *mut EXCEPTION_RECORD,
	298	establisherFrame: LPVOID,
	299	contextRecord: *mut CONTEXT,
	300	dispatcherContext: *mut DISPATCHER_CONTEXT,
	301	personality: PersonalityFn)
	302	-> EXCEPTION_DISPOSITION;
	303	}
	304	}
	305	} // cfg_if!