1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65

use crate::dwarf::DwarfUnwinderError;
#[cfg(feature = "macho")]
use crate::macho::CompactUnwindInfoUnwinderError;
#[cfg(feature = "pe")]
use crate::pe::PeUnwinderError;

/// The error type used in this crate.
#[cfg_attr(feature = "std", derive(thiserror::Error))]
#[cfg_attr(not(feature = "std"), derive(thiserror_no_std::Error))]
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Error {
    #[error("Could not read stack memory at 0x{0:x}")]
    CouldNotReadStack(u64),

    #[error("Frame pointer unwinding moved backwards")]
    FramepointerUnwindingMovedBackwards,

    #[error("Neither the code address nor the stack pointer changed, would loop")]
    DidNotAdvance,

    #[error("Unwinding caused integer overflow")]
    IntegerOverflow,

    #[error("Return address is null")]
    ReturnAddressIsNull,
}

#[cfg_attr(feature = "std", derive(thiserror::Error))]
#[cfg_attr(not(feature = "std"), derive(thiserror_no_std::Error))]
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum UnwinderError {
    #[cfg(feature = "macho")]
    #[error("Compact Unwind Info unwinding failed: {0}")]
    CompactUnwindInfo(#[source] CompactUnwindInfoUnwinderError),

    #[error("DWARF unwinding failed: {0}")]
    Dwarf(#[from] DwarfUnwinderError),

    #[cfg(feature = "pe")]
    #[error("PE unwinding failed: {0}")]
    Pe(#[from] PeUnwinderError),

    #[cfg(feature = "macho")]
    #[error("__unwind_info referred to DWARF FDE but we do not have __eh_frame data")]
    NoDwarfData,

    #[error("No unwind data for the module containing the address")]
    NoModuleUnwindData,

    #[error(".eh_frame_hdr was not successful in looking up the address in the table")]
    EhFrameHdrCouldNotFindAddress,

    #[error("Failed to look up the address in the DwarfCfiIndex search table")]
    DwarfCfiIndexCouldNotFindAddress,
}

#[cfg(feature = "macho")]
impl From<CompactUnwindInfoUnwinderError> for UnwinderError {
    fn from(e: CompactUnwindInfoUnwinderError) -> Self {
        match e {
            CompactUnwindInfoUnwinderError::BadDwarfUnwinding(e) => UnwinderError::Dwarf(e),
            e => UnwinderError::CompactUnwindInfo(e),
        }
    }
}