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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,132 @@ | ||
| use alloc::borrow::Cow; | ||
| use alloc::sync::Arc; | ||
| use std::fs::File; | ||
| use std::path::PathBuf; | ||
|
|
||
| use object::Object; | ||
|
|
||
| use crate::{LookupContinuation, LookupResult}; | ||
|
|
||
| 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::Break(output) => break output, | ||
| LookupResult::Continue(load) => load, | ||
| }; | ||
|
|
||
| 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 path = PathBuf::from(&load.dwo_name); | ||
| 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); | ||
| } | ||
| } | ||
| } |
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