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
use std::ffi::CStr;
use std::marker::PhantomData;
use std::os::raw::{c_char, c_int};
use crate::ffi::{self, lua_Debug, lua_State};
use crate::lua::Lua;
use crate::util::callback_error;
#[derive(Clone)]
pub struct Debug<'a> {
ar: *mut lua_Debug,
state: *mut lua_State,
_phantom: PhantomData<&'a ()>,
}
impl<'a> Debug<'a> {
pub fn names(&self) -> DebugNames<'a> {
unsafe {
mlua_assert!(
ffi::lua_getinfo(self.state, cstr!("n"), self.ar) != 0,
"lua_getinfo failed with `n`"
);
DebugNames {
name: ptr_to_str((*self.ar).name),
name_what: ptr_to_str((*self.ar).namewhat),
}
}
}
pub fn source(&self) -> DebugSource<'a> {
unsafe {
mlua_assert!(
ffi::lua_getinfo(self.state, cstr!("S"), self.ar) != 0,
"lua_getinfo failed with `S`"
);
DebugSource {
source: ptr_to_str((*self.ar).source),
short_src: ptr_to_str((*self.ar).short_src.as_ptr()),
line_defined: (*self.ar).linedefined as i32,
last_line_defined: (*self.ar).lastlinedefined as i32,
what: ptr_to_str((*self.ar).what),
}
}
}
pub fn curr_line(&self) -> i32 {
unsafe {
mlua_assert!(
ffi::lua_getinfo(self.state, cstr!("l"), self.ar) != 0,
"lua_getinfo failed with `l`"
);
(*self.ar).currentline as i32
}
}
pub fn is_tail_call(&self) -> bool {
unsafe {
mlua_assert!(
ffi::lua_getinfo(self.state, cstr!("t"), self.ar) != 0,
"lua_getinfo failed with `t`"
);
(*self.ar).currentline != 0
}
}
pub fn stack(&self) -> DebugStack {
unsafe {
mlua_assert!(
ffi::lua_getinfo(self.state, cstr!("u"), self.ar) != 0,
"lua_getinfo failed with `u`"
);
DebugStack {
num_ups: (*self.ar).nups as i32,
#[cfg(any(feature = "lua54", feature = "lua53", feature = "lua52"))]
num_params: (*self.ar).nparams as i32,
#[cfg(any(feature = "lua54", feature = "lua53", feature = "lua52"))]
is_vararg: (*self.ar).isvararg != 0,
}
}
}
}
#[derive(Clone, Debug)]
pub struct DebugNames<'a> {
pub name: Option<&'a [u8]>,
pub name_what: Option<&'a [u8]>,
}
#[derive(Clone, Debug)]
pub struct DebugSource<'a> {
pub source: Option<&'a [u8]>,
pub short_src: Option<&'a [u8]>,
pub line_defined: i32,
pub last_line_defined: i32,
pub what: Option<&'a [u8]>,
}
#[derive(Copy, Clone, Debug)]
pub struct DebugStack {
pub num_ups: i32,
#[cfg(any(feature = "lua54", feature = "lua53", feature = "lua52", doc))]
pub num_params: i32,
#[cfg(any(feature = "lua54", feature = "lua53", feature = "lua52", doc))]
pub is_vararg: bool,
}
#[derive(Clone, Copy, Debug, Default)]
pub struct HookTriggers {
pub on_calls: bool,
pub on_returns: bool,
pub every_line: bool,
pub every_nth_instruction: Option<u32>,
}
impl HookTriggers {
pub(crate) fn mask(&self) -> c_int {
let mut mask: c_int = 0;
if self.on_calls {
mask |= ffi::LUA_MASKCALL
}
if self.on_returns {
mask |= ffi::LUA_MASKRET
}
if self.every_line {
mask |= ffi::LUA_MASKLINE
}
if self.every_nth_instruction.is_some() {
mask |= ffi::LUA_MASKCOUNT
}
mask
}
pub(crate) fn count(&self) -> c_int {
self.every_nth_instruction.unwrap_or(0) as c_int
}
}
pub(crate) unsafe extern "C" fn hook_proc(state: *mut lua_State, ar: *mut lua_Debug) {
callback_error(state, |_| {
let debug = Debug {
ar,
state,
_phantom: PhantomData,
};
let lua = mlua_expect!(Lua::make_from_ptr(state), "cannot make Lua instance");
let hook_cb = mlua_expect!(lua.hook_callback(), "no hook callback set in hook_proc");
#[allow(clippy::match_wild_err_arm)]
match hook_cb.try_borrow_mut() {
Ok(mut b) => (&mut *b)(&lua, debug),
Err(_) => mlua_panic!("Lua should not allow hooks to be called within another hook"),
}?;
Ok(())
})
}
unsafe fn ptr_to_str<'a>(input: *const c_char) -> Option<&'a [u8]> {
if input.is_null() {
None
} else {
Some(CStr::from_ptr(input).to_bytes())
}
}