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use alloc::vec::Vec;
use crate::common::Encoding;
use crate::write::{
AbbreviationTable, LineProgram, LineStringTable, Result, Sections, StringTable, Unit,
UnitTable, Writer,
};
/// Writable DWARF information for more than one unit.
#[derive(Debug, Default)]
pub struct Dwarf {
/// A table of units. These are primarily stored in the `.debug_info` section,
/// but they also contain information that is stored in other sections.
pub units: UnitTable,
/// Extra line number programs that are not associated with a unit.
///
/// These should only be used when generating DWARF5 line-only debug
/// information.
pub line_programs: Vec<LineProgram>,
/// A table of strings that will be stored in the `.debug_line_str` section.
pub line_strings: LineStringTable,
/// A table of strings that will be stored in the `.debug_str` section.
pub strings: StringTable,
}
impl Dwarf {
/// Create a new `Dwarf` instance.
#[inline]
pub fn new() -> Self {
Self::default()
}
/// Write the DWARF information to the given sections.
pub fn write<W: Writer>(&mut self, sections: &mut Sections<W>) -> Result<()> {
let line_strings = self.line_strings.write(&mut sections.debug_line_str)?;
let strings = self.strings.write(&mut sections.debug_str)?;
self.units.write(sections, &line_strings, &strings)?;
for line_program in &self.line_programs {
line_program.write(
&mut sections.debug_line,
line_program.encoding(),
&line_strings,
&strings,
)?;
}
Ok(())
}
}
/// Writable DWARF information for a single unit.
#[derive(Debug)]
pub struct DwarfUnit {
/// A unit. This is primarily stored in the `.debug_info` section,
/// but also contains information that is stored in other sections.
pub unit: Unit,
/// A table of strings that will be stored in the `.debug_line_str` section.
pub line_strings: LineStringTable,
/// A table of strings that will be stored in the `.debug_str` section.
pub strings: StringTable,
}
impl DwarfUnit {
/// Create a new `DwarfUnit`.
///
/// Note: you should set `self.unit.line_program` after creation.
/// This cannot be done earlier because it may need to reference
/// `self.line_strings`.
pub fn new(encoding: Encoding) -> Self {
let unit = Unit::new(encoding, LineProgram::none());
DwarfUnit {
unit,
line_strings: LineStringTable::default(),
strings: StringTable::default(),
}
}
/// Write the DWARf information to the given sections.
pub fn write<W: Writer>(&mut self, sections: &mut Sections<W>) -> Result<()> {
let line_strings = self.line_strings.write(&mut sections.debug_line_str)?;
let strings = self.strings.write(&mut sections.debug_str)?;
let abbrev_offset = sections.debug_abbrev.offset();
let mut abbrevs = AbbreviationTable::default();
self.unit.write(
sections,
abbrev_offset,
&mut abbrevs,
&line_strings,
&strings,
)?;
// None should exist because we didn't give out any UnitId.
assert!(sections.debug_info_refs.is_empty());
assert!(sections.debug_loc_refs.is_empty());
assert!(sections.debug_loclists_refs.is_empty());
abbrevs.write(&mut sections.debug_abbrev)?;
Ok(())
}
}
#[cfg(feature = "read")]
pub(crate) mod convert {
use super::*;
use crate::read::{self, Reader};
use crate::write::{Address, ConvertResult};
impl Dwarf {
/// Create a `write::Dwarf` by converting a `read::Dwarf`.
///
/// `convert_address` is a function to convert read addresses into the `Address`
/// type. For non-relocatable addresses, this function may simply return
/// `Address::Constant(address)`. For relocatable addresses, it is the caller's
/// responsibility to determine the symbol and addend corresponding to the address
/// and return `Address::Symbol { symbol, addend }`.
pub fn from<R: Reader<Offset = usize>>(
dwarf: &read::Dwarf<R>,
convert_address: &dyn Fn(u64) -> Option<Address>,
) -> ConvertResult<Dwarf> {
let mut line_strings = LineStringTable::default();
let mut strings = StringTable::default();
let units = UnitTable::from(dwarf, &mut line_strings, &mut strings, convert_address)?;
// TODO: convert the line programs that were not referenced by a unit.
let line_programs = Vec::new();
Ok(Dwarf {
units,
line_programs,
line_strings,
strings,
})
}
}
}