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use alloc::borrow::Cow;
use alloc::sync::Arc;
use std::fs::File;
use std::path::PathBuf;
use object::Object;
use crate::{LookupContinuation, LookupResult};
#[cfg(unix)]
fn convert_path<R: gimli::Reader<Endian = gimli::RunTimeEndian>>(
r: &R,
) -> Result<PathBuf, gimli::Error> {
use std::ffi::OsStr;
use std::os::unix::ffi::OsStrExt;
let bytes = r.to_slice()?;
let s = OsStr::from_bytes(&bytes);
Ok(PathBuf::from(s))
}
#[cfg(not(unix))]
fn convert_path<R: gimli::Reader<Endian = gimli::RunTimeEndian>>(
r: &R,
) -> Result<PathBuf, gimli::Error> {
let bytes = r.to_slice()?;
let s = std::str::from_utf8(&bytes).map_err(|_| gimli::Error::BadUtf8)?;
Ok(PathBuf::from(s))
}
fn load_section<'data: 'file, 'file, O, R, F>(
id: gimli::SectionId,
file: &'file O,
endian: R::Endian,
loader: &mut F,
) -> Result<R, gimli::Error>
where
O: object::Object<'data, 'file>,
R: gimli::Reader<Endian = gimli::RunTimeEndian>,
F: FnMut(Cow<'data, [u8]>, R::Endian) -> R,
{
use object::ObjectSection;
let data = id
.dwo_name()
.and_then(|dwo_name| {
file.section_by_name(dwo_name)
.and_then(|section| section.uncompressed_data().ok())
})
.unwrap_or(Cow::Borrowed(&[]));
Ok(loader(data, endian))
}
/// A simple builtin split DWARF loader.
pub struct SplitDwarfLoader<R, F>
where
R: gimli::Reader<Endian = gimli::RunTimeEndian>,
F: FnMut(Cow<'_, [u8]>, R::Endian) -> R,
{
loader: F,
dwarf_package: Option<gimli::DwarfPackage<R>>,
}
impl<R, F> SplitDwarfLoader<R, F>
where
R: gimli::Reader<Endian = gimli::RunTimeEndian>,
F: FnMut(Cow<'_, [u8]>, R::Endian) -> R,
{
fn load_dwarf_package(loader: &mut F, path: Option<PathBuf>) -> Option<gimli::DwarfPackage<R>> {
let mut path = path.map(Ok).unwrap_or_else(std::env::current_exe).ok()?;
let dwp_extension = path
.extension()
.map(|previous_extension| {
let mut previous_extension = previous_extension.to_os_string();
previous_extension.push(".dwp");
previous_extension
})
.unwrap_or_else(|| "dwp".into());
path.set_extension(dwp_extension);
let file = File::open(&path).ok()?;
let map = unsafe { memmap2::Mmap::map(&file).ok()? };
let dwp = object::File::parse(&*map).ok()?;
let endian = if dwp.is_little_endian() {
gimli::RunTimeEndian::Little
} else {
gimli::RunTimeEndian::Big
};
let empty = loader(Cow::Borrowed(&[]), endian);
gimli::DwarfPackage::load(
|section_id| load_section(section_id, &dwp, endian, loader),
empty,
)
.ok()
}
/// Create a new split DWARF loader.
pub fn new(mut loader: F, path: Option<PathBuf>) -> SplitDwarfLoader<R, F> {
let dwarf_package = SplitDwarfLoader::load_dwarf_package(&mut loader, path);
SplitDwarfLoader {
loader,
dwarf_package,
}
}
/// Run the provided `LookupResult` to completion, loading any necessary
/// split DWARF along the way.
pub fn run<L>(&mut self, mut l: LookupResult<L>) -> L::Output
where
L: LookupContinuation<Buf = R>,
{
loop {
let (load, continuation) = match l {
LookupResult::Output(output) => break output,
LookupResult::Load { load, continuation } => (load, continuation),
};
let mut r: Option<Arc<gimli::Dwarf<_>>> = None;
if let Some(dwp) = self.dwarf_package.as_ref() {
if let Ok(Some(cu)) = dwp.find_cu(load.dwo_id, &load.parent) {
r = Some(Arc::new(cu));
}
}
if r.is_none() {
let mut path = PathBuf::new();
if let Some(p) = load.comp_dir.as_ref() {
if let Ok(p) = convert_path(p) {
path.push(p);
}
}
if let Some(p) = load.path.as_ref() {
if let Ok(p) = convert_path(p) {
path.push(p);
}
}
if let Ok(file) = File::open(&path) {
if let Ok(map) = unsafe { memmap2::Mmap::map(&file) } {
if let Ok(file) = object::File::parse(&*map) {
let endian = if file.is_little_endian() {
gimli::RunTimeEndian::Little
} else {
gimli::RunTimeEndian::Big
};
r = gimli::Dwarf::load(|id| {
load_section(id, &file, endian, &mut self.loader)
})
.ok()
.map(|mut dwo_dwarf| {
dwo_dwarf.make_dwo(&load.parent);
Arc::new(dwo_dwarf)
});
}
}
}
}
l = continuation.resume(r);
}
}
}
|
