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
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
use std::os::raw::c_void;
pub struct Frame {
ctx: *mut uw::_Unwind_Context,
}
impl Frame {
pub fn ip(&self) -> *mut c_void {
let mut ip_before_insn = 0;
let mut ip = unsafe {
uw::_Unwind_GetIPInfo(self.ctx, &mut ip_before_insn) as *mut c_void
};
if !ip.is_null() && ip_before_insn == 0 {
ip = (ip as usize - 1) as *mut _;
}
return ip
}
pub fn symbol_address(&self) -> *mut c_void {
if cfg!(target_os = "macos") || cfg!(target_os = "ios") {
self.ip()
} else {
unsafe { uw::_Unwind_FindEnclosingFunction(self.ip()) }
}
}
}
#[inline(always)]
pub fn trace(mut cb: &mut FnMut(&super::Frame) -> bool) {
unsafe {
uw::_Unwind_Backtrace(trace_fn, &mut cb as *mut _ as *mut _);
}
extern fn trace_fn(ctx: *mut uw::_Unwind_Context,
arg: *mut c_void) -> uw::_Unwind_Reason_Code {
let cb = unsafe { &mut *(arg as *mut &mut FnMut(&super::Frame) -> bool) };
let cx = super::Frame {
inner: Frame { ctx: ctx },
};
let mut bomb = ::Bomb { enabled: true };
let keep_going = cb(&cx);
bomb.enabled = false;
if keep_going {
uw::_URC_NO_REASON
} else {
uw::_URC_FAILURE
}
}
}
#[allow(non_camel_case_types)]
#[allow(non_snake_case)]
#[allow(dead_code)]
mod uw {
pub use self::_Unwind_Reason_Code::*;
use libc;
use std::os::raw::{c_int, c_void};
#[repr(C)]
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,
}
pub enum _Unwind_Context {}
pub type _Unwind_Trace_Fn =
extern fn(ctx: *mut _Unwind_Context,
arg: *mut c_void) -> _Unwind_Reason_Code;
extern {
#[cfg(not(all(target_os = "ios", target_arch = "arm")))]
pub fn _Unwind_Backtrace(trace: _Unwind_Trace_Fn,
trace_argument: *mut c_void)
-> _Unwind_Reason_Code;
#[cfg(all(not(all(target_os = "android", target_arch = "arm")),
not(all(target_os = "linux", target_arch = "arm"))))]
pub fn _Unwind_GetIPInfo(ctx: *mut _Unwind_Context,
ip_before_insn: *mut c_int)
-> libc::uintptr_t;
#[cfg(all(not(target_os = "android"),
not(all(target_os = "linux", target_arch = "arm"))))]
pub fn _Unwind_FindEnclosingFunction(pc: *mut c_void)
-> *mut c_void;
}
#[cfg(any(all(target_os = "android", target_arch = "arm"),
all(target_os = "linux", target_arch = "arm")))]
pub unsafe fn _Unwind_GetIP(ctx: *mut _Unwind_Context) -> libc::uintptr_t {
#[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,
}
#[repr(C)]
enum _Unwind_VRS_DataRepresentation {
_UVRSD_UINT32 = 0,
_UVRSD_VFPX = 1,
_UVRSD_FPAX = 2,
_UVRSD_UINT64 = 3,
_UVRSD_FLOAT = 4,
_UVRSD_DOUBLE = 5,
}
type _Unwind_Word = libc::c_uint;
extern {
fn _Unwind_VRS_Get(ctx: *mut _Unwind_Context,
klass: _Unwind_VRS_RegClass,
word: _Unwind_Word,
repr: _Unwind_VRS_DataRepresentation,
data: *mut c_void)
-> _Unwind_VRS_Result;
}
let mut val: _Unwind_Word = 0;
let ptr = &mut val as *mut _Unwind_Word;
let _ = _Unwind_VRS_Get(ctx, _Unwind_VRS_RegClass::_UVRSC_CORE, 15,
_Unwind_VRS_DataRepresentation::_UVRSD_UINT32,
ptr as *mut c_void);
(val & !1) as libc::uintptr_t
}
#[cfg(any(all(target_os = "android", target_arch = "arm"),
all(target_os = "linux", target_arch = "arm")))]
pub unsafe fn _Unwind_GetIPInfo(ctx: *mut _Unwind_Context,
ip_before_insn: *mut c_int)
-> libc::uintptr_t
{
*ip_before_insn = 0;
_Unwind_GetIP(ctx)
}
#[cfg(any(target_os = "android",
all(target_os = "linux", target_arch = "arm")))]
pub unsafe fn _Unwind_FindEnclosingFunction(pc: *mut c_void)
-> *mut c_void
{
pc
}
}