-
Notifications
You must be signed in to change notification settings - Fork 63
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Prototype what a continuation based API would look like.
- Loading branch information
Showing
7 changed files
with
620 additions
and
268 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,133 @@ | ||
| use alloc::borrow::Cow; | ||
| use alloc::sync::Arc; | ||
| use core::ops::ControlFlow; | ||
| use std::fs::File; | ||
| use std::path::PathBuf; | ||
|
|
||
| use object::Object; | ||
|
|
||
| use crate::LookupContinuation; | ||
|
|
||
| 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 LookupContinuation to completion, loading any necessary | ||
| /// split DWARF along the way. | ||
| pub fn run<L>(&mut self, mut l: L) -> L::Output | ||
| where | ||
| L: LookupContinuation<R = R>, | ||
| { | ||
| loop { | ||
| let load = match l.state() { | ||
| ControlFlow::Break(output) => break output, | ||
| ControlFlow::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.resume(r); | ||
| } | ||
| } | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Oops, something went wrong.