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|
//! 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)),
},
}
}
}
|
