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
|
//! Write the debuginfo into an object file.
use cranelift_object::ObjectProduct;
use rustc_data_structures::fx::FxHashMap;
use gimli::write::{Address, AttributeValue, EndianVec, Result, Sections, Writer};
use gimli::{RunTimeEndian, SectionId};
use super::object::WriteDebugInfo;
use super::DebugContext;
impl DebugContext {
pub(crate) fn emit(&mut self, product: &mut ObjectProduct) {
let unit_range_list_id = self.dwarf.unit.ranges.add(self.unit_range_list.clone());
let root = self.dwarf.unit.root();
let root = self.dwarf.unit.get_mut(root);
root.set(gimli::DW_AT_ranges, AttributeValue::RangeListRef(unit_range_list_id));
let mut sections = Sections::new(WriterRelocate::new(self.endian));
self.dwarf.write(&mut sections).unwrap();
let mut section_map = FxHashMap::default();
let _: Result<()> = sections.for_each_mut(|id, section| {
if !section.writer.slice().is_empty() {
let section_id = product.add_debug_section(id, section.writer.take());
section_map.insert(id, section_id);
}
Ok(())
});
let _: Result<()> = sections.for_each(|id, section| {
if let Some(section_id) = section_map.get(&id) {
for reloc in §ion.relocs {
product.add_debug_reloc(§ion_map, section_id, reloc);
}
}
Ok(())
});
}
}
#[derive(Clone)]
pub(crate) struct DebugReloc {
pub(crate) offset: u32,
pub(crate) size: u8,
pub(crate) name: DebugRelocName,
pub(crate) addend: i64,
pub(crate) kind: object::RelocationKind,
}
#[derive(Clone)]
pub(crate) enum DebugRelocName {
Section(SectionId),
Symbol(usize),
}
/// A [`Writer`] that collects all necessary relocations.
#[derive(Clone)]
pub(super) struct WriterRelocate {
pub(super) relocs: Vec<DebugReloc>,
pub(super) writer: EndianVec<RunTimeEndian>,
}
impl WriterRelocate {
pub(super) fn new(endian: RunTimeEndian) -> Self {
WriterRelocate { relocs: Vec::new(), writer: EndianVec::new(endian) }
}
/// Perform the collected relocations to be usable for JIT usage.
#[cfg(all(feature = "jit", not(windows)))]
pub(super) fn relocate_for_jit(mut self, jit_module: &cranelift_jit::JITModule) -> Vec<u8> {
for reloc in self.relocs.drain(..) {
match reloc.name {
super::DebugRelocName::Section(_) => unreachable!(),
super::DebugRelocName::Symbol(sym) => {
let addr = jit_module.get_finalized_function(
cranelift_module::FuncId::from_u32(sym.try_into().unwrap()),
);
let val = (addr as u64 as i64 + reloc.addend) as u64;
self.writer.write_udata_at(reloc.offset as usize, val, reloc.size).unwrap();
}
}
}
self.writer.into_vec()
}
}
impl Writer for WriterRelocate {
type Endian = RunTimeEndian;
fn endian(&self) -> Self::Endian {
self.writer.endian()
}
fn len(&self) -> usize {
self.writer.len()
}
fn write(&mut self, bytes: &[u8]) -> Result<()> {
self.writer.write(bytes)
}
fn write_at(&mut self, offset: usize, bytes: &[u8]) -> Result<()> {
self.writer.write_at(offset, bytes)
}
fn write_address(&mut self, address: Address, size: u8) -> Result<()> {
match address {
Address::Constant(val) => self.write_udata(val, size),
Address::Symbol { symbol, addend } => {
let offset = self.len() as u64;
self.relocs.push(DebugReloc {
offset: offset as u32,
size,
name: DebugRelocName::Symbol(symbol),
addend: addend as i64,
kind: object::RelocationKind::Absolute,
});
self.write_udata(0, size)
}
}
}
fn write_offset(&mut self, val: usize, section: SectionId, size: u8) -> Result<()> {
let offset = self.len() as u32;
self.relocs.push(DebugReloc {
offset,
size,
name: DebugRelocName::Section(section),
addend: val as i64,
kind: object::RelocationKind::Absolute,
});
self.write_udata(0, size)
}
fn write_offset_at(
&mut self,
offset: usize,
val: usize,
section: SectionId,
size: u8,
) -> Result<()> {
self.relocs.push(DebugReloc {
offset: offset as u32,
size,
name: DebugRelocName::Section(section),
addend: val as i64,
kind: object::RelocationKind::Absolute,
});
self.write_udata_at(offset, 0, size)
}
fn write_eh_pointer(&mut self, address: Address, eh_pe: gimli::DwEhPe, size: u8) -> Result<()> {
match address {
// Address::Constant arm copied from gimli
Address::Constant(val) => {
// Indirect doesn't matter here.
let val = match eh_pe.application() {
gimli::DW_EH_PE_absptr => val,
gimli::DW_EH_PE_pcrel => {
// FIXME better handling of sign
let offset = self.len() as u64;
offset.wrapping_sub(val)
}
_ => {
return Err(gimli::write::Error::UnsupportedPointerEncoding(eh_pe));
}
};
self.write_eh_pointer_data(val, eh_pe.format(), size)
}
Address::Symbol { symbol, addend } => match eh_pe.application() {
gimli::DW_EH_PE_pcrel => {
let size = match eh_pe.format() {
gimli::DW_EH_PE_sdata4 => 4,
_ => return Err(gimli::write::Error::UnsupportedPointerEncoding(eh_pe)),
};
self.relocs.push(DebugReloc {
offset: self.len() as u32,
size,
name: DebugRelocName::Symbol(symbol),
addend,
kind: object::RelocationKind::Relative,
});
self.write_udata(0, size)
}
_ => Err(gimli::write::Error::UnsupportedPointerEncoding(eh_pe)),
},
}
}
}
|
