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use gimli::{Encoding, EndianSlice, RunTimeEndian, UnitIndex};
use object::{Endianness, ObjectSection};
use crate::{relocate::RelocationMap, Session};
/// Helper trait to translate between `object`'s `Endianness` and `gimli`'s `RunTimeEndian`.
pub(crate) trait EndianityExt {
fn as_runtime_endian(&self) -> RunTimeEndian;
}
impl EndianityExt for Endianness {
fn as_runtime_endian(&self) -> RunTimeEndian {
match *self {
Endianness::Little => RunTimeEndian::Little,
Endianness::Big => RunTimeEndian::Big,
}
}
}
/// Helper trait to add `compressed_data_range` function to `ObjectSection` types.
pub(crate) trait CompressedDataRangeExt<'input, 'session: 'input>:
ObjectSection<'input>
{
/// Return the decompressed contents of the section data in the given range.
///
/// Decompression happens only if the data is compressed.
fn compressed_data_range(
&self,
sess: &'session impl Session<RelocationMap>,
address: u64,
size: u64,
) -> object::Result<Option<&'input [u8]>>;
}
impl<'input, 'session: 'input, S> CompressedDataRangeExt<'input, 'session> for S
where
S: ObjectSection<'input>,
{
fn compressed_data_range(
&self,
sess: &'session impl Session<RelocationMap>,
address: u64,
size: u64,
) -> object::Result<Option<&'input [u8]>> {
let data = self.compressed_data()?.decompress()?;
/// Originally from `object::read::util`, used in `ObjectSection::data_range`, but not
/// public.
fn data_range(
data: &[u8],
data_address: u64,
range_address: u64,
size: u64,
) -> Option<&[u8]> {
let offset = range_address.checked_sub(data_address)?;
data.get(offset.try_into().ok()?..)?.get(..size.try_into().ok()?)
}
let data_ref = sess.alloc_owned_cow(data);
Ok(data_range(data_ref, self.address(), address, size))
}
}
/// Helper trait that abstracts over `gimli::DebugCuIndex` and `gimli::DebugTuIndex`.
pub(crate) trait IndexSectionExt<'input, Endian: gimli::Endianity, R: gimli::Reader>:
gimli::Section<R>
{
fn new(section: &'input [u8], endian: Endian) -> Self;
fn index(self) -> gimli::read::Result<UnitIndex<R>>;
}
impl<'input, Endian: gimli::Endianity> IndexSectionExt<'input, Endian, EndianSlice<'input, Endian>>
for gimli::DebugCuIndex<EndianSlice<'input, Endian>>
{
fn new(section: &'input [u8], endian: Endian) -> Self {
Self::new(section, endian)
}
fn index(self) -> gimli::read::Result<UnitIndex<EndianSlice<'input, Endian>>> {
Self::index(self)
}
}
impl<'input, Endian: gimli::Endianity> IndexSectionExt<'input, Endian, EndianSlice<'input, Endian>>
for gimli::DebugTuIndex<EndianSlice<'input, Endian>>
{
fn new(section: &'input [u8], endian: Endian) -> Self {
Self::new(section, endian)
}
fn index(self) -> gimli::read::Result<UnitIndex<EndianSlice<'input, Endian>>> {
Self::index(self)
}
}
/// Helper trait to add DWARF package specific functions to the `Encoding` type.
pub(crate) trait PackageFormatExt {
/// Returns `true` if this `Encoding` would produce to a DWARF 5-standardized package file.
///
/// See Sec 7.3.5 and Appendix F of the [DWARF specification].
///
/// [DWARF specification]: https://dwarfstd.org/doc/DWARF5.pdf
fn is_std_dwarf_package_format(&self) -> bool;
/// Returns `true` if this `Encoding` would produce a GNU Extension DWARF package file
/// (preceded standardized version from DWARF 5).
///
/// See [specification](https://gcc.gnu.org/wiki/DebugFissionDWP).
fn is_gnu_extension_dwarf_package_format(&self) -> bool;
/// Returns index version of DWARF package for this `Encoding`.
fn dwarf_package_index_version(&self) -> u16;
/// Returns `true` if the dwarf package index version provided is compatible with this
/// `Encoding`.
fn is_compatible_dwarf_package_index_version(&self, index_version: u16) -> bool;
}
impl PackageFormatExt for Encoding {
fn is_gnu_extension_dwarf_package_format(&self) -> bool {
!self.is_std_dwarf_package_format()
}
fn is_std_dwarf_package_format(&self) -> bool {
self.version >= 5
}
fn dwarf_package_index_version(&self) -> u16 {
if self.is_gnu_extension_dwarf_package_format() {
2
} else {
5
}
}
fn is_compatible_dwarf_package_index_version(&self, index_version: u16) -> bool {
if self.is_gnu_extension_dwarf_package_format() {
index_version == 2
} else {
index_version >= 5
}
}
}
|
