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+//! This crate provides a cross-platform library and binary for translating addresses into
+//! function names, file names and line numbers. Given an address in an executable or an
+//! offset in a section of a relocatable object, it uses the debugging information to
+//! figure out which file name and line number are associated with it.
+//!
+//! When used as a library, files must first be loaded using the
+//! [`object`](https://github.com/gimli-rs/object) crate.
+//! A context can then be created with [`Context::new`](./struct.Context.html#method.new).
+//! The context caches some of the parsed information so that multiple lookups are
+//! efficient.
+//! Location information is obtained with
+//! [`Context::find_location`](./struct.Context.html#method.find_location) or
+//! [`Context::find_location_range`](./struct.Context.html#method.find_location_range).
+//! Function information is obtained with
+//! [`Context::find_frames`](./struct.Context.html#method.find_frames), which returns
+//! a frame for each inline function. Each frame contains both name and location.
+//!
+//! The crate has an example CLI wrapper around the library which provides some of
+//! the functionality of the `addr2line` command line tool distributed with [GNU
+//! binutils](https://www.gnu.org/software/binutils/).
+//!
+//! Currently this library only provides information from the DWARF debugging information,
+//! which is parsed using [`gimli`](https://github.com/gimli-rs/gimli). The example CLI
+//! wrapper also uses symbol table information provided by the `object` crate.
+#![deny(missing_docs)]
+#![no_std]
+
+#[cfg(feature = "std")]
+extern crate std;
+
+#[allow(unused_imports)]
+#[macro_use]
+extern crate alloc;
+
+#[cfg(feature = "fallible-iterator")]
+pub extern crate fallible_iterator;
+pub extern crate gimli;
+#[cfg(feature = "object")]
+pub extern crate object;
+
+use alloc::borrow::Cow;
+use alloc::boxed::Box;
+#[cfg(feature = "object")]
+use alloc::rc::Rc;
+use alloc::string::{String, ToString};
+use alloc::sync::Arc;
+use alloc::vec::Vec;
+
+use core::cmp::{self, Ordering};
+use core::iter;
+use core::marker::PhantomData;
+use core::mem;
+use core::num::NonZeroU64;
+use core::ops::ControlFlow;
+use core::u64;
+
+use crate::function::{Function, Functions, InlinedFunction};
+use crate::lazy::LazyCell;
+
+#[cfg(feature = "smallvec")]
+mod maybe_small {
+ pub type Vec<T> = smallvec::SmallVec<[T; 16]>;
+ pub type IntoIter<T> = smallvec::IntoIter<[T; 16]>;
+}
+#[cfg(not(feature = "smallvec"))]
+mod maybe_small {
+ pub type Vec<T> = alloc::vec::Vec<T>;
+ pub type IntoIter<T> = alloc::vec::IntoIter<T>;
+}
+
+#[cfg(all(feature = "std", feature = "object", feature = "memmap2"))]
+/// A simple builtin split DWARF loader.
+pub mod builtin_split_dwarf_loader;
+mod function;
+mod lazy;
+
+type Error = gimli::Error;
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+enum DebugFile {
+ Primary,
+ Supplementary,
+ Dwo,
+}
+
+/// Operations that consult debug information may require additional files
+/// to be loaded if split DWARF is being used. This enum returns the result
+/// of the operation in the `Break` variant, or information about the split
+/// DWARF that is required and a continuation to invoke once it is available
+/// in the `Continue` variant.
+///
+/// This enum is intended to be used in a loop like so:
+/// ```no_run
+/// # use addr2line::*;
+/// # use std::sync::Arc;
+/// # let ctx: Context<gimli::EndianRcSlice<gimli::RunTimeEndian>> = todo!();
+/// # let do_split_dwarf_load = |load: SplitDwarfLoad<gimli::EndianRcSlice<gimli::RunTimeEndian>>| -> Option<Arc<gimli::Dwarf<gimli::EndianRcSlice<gimli::RunTimeEndian>>>> { None };
+/// const ADDRESS: u64 = 0xdeadbeef;
+/// let mut r = ctx.find_frames(ADDRESS);
+/// let result = loop {
+/// match r {
+/// LookupResult::Output(result) => break result,
+/// LookupResult::Load { load, continuation } => {
+/// let dwo = do_split_dwarf_load(load);
+/// r = continuation.resume(dwo);
+/// }
+/// }
+/// };
+/// ```
+pub enum LookupResult<L: LookupContinuation> {
+ /// The lookup requires split DWARF data to be loaded.
+ Load {
+ /// The information needed to find the split DWARF data.
+ load: SplitDwarfLoad<<L as LookupContinuation>::Buf>,
+ /// The continuation to resume with the loaded split DWARF data.
+ continuation: L,
+ },
+ /// The lookup has completed and produced an output.
+ Output(<L as LookupContinuation>::Output),
+}
+
+/// This trait represents a partially complete operation that can be resumed
+/// once a load of needed split DWARF data is completed or abandoned by the
+/// API consumer.
+pub trait LookupContinuation: Sized {
+ /// The final output of this operation.
+ type Output;
+ /// The type of reader used.
+ type Buf: gimli::Reader;
+
+ /// Resumes the operation with the provided data.
+ ///
+ /// After the caller loads the split DWARF data required, call this
+ /// method to resume the operation. The return value of this method
+ /// indicates if the computation has completed or if further data is
+ /// required.
+ ///
+ /// If the additional data cannot be located, or the caller does not
+ /// support split DWARF, `resume(None)` can be used to continue the
+ /// operation with the data that is available.
+ fn resume(self, input: Option<Arc<gimli::Dwarf<Self::Buf>>>) -> LookupResult<Self>;
+}
+
+impl<L: LookupContinuation> LookupResult<L> {
+ /// Callers that do not handle split DWARF can call `skip_all_loads`
+ /// to fast-forward to the end result. This result is produced with
+ /// the data that is available and may be less accurate than the
+ /// the results that would be produced if the caller did properly
+ /// support split DWARF.
+ pub fn skip_all_loads(mut self) -> L::Output {
+ loop {
+ self = match self {
+ LookupResult::Output(t) => return t,
+ LookupResult::Load { continuation, .. } => continuation.resume(None),
+ };
+ }
+ }
+
+ fn map<T, F: FnOnce(L::Output) -> T>(self, f: F) -> LookupResult<MappedLookup<T, L, F>> {
+ match self {
+ LookupResult::Output(t) => LookupResult::Output(f(t)),
+ LookupResult::Load { load, continuation } => LookupResult::Load {
+ load,
+ continuation: MappedLookup {
+ original: continuation,
+ mutator: f,
+ },
+ },
+ }
+ }
+
+ fn unwrap(self) -> L::Output {
+ match self {
+ LookupResult::Output(t) => t,
+ LookupResult::Load { .. } => unreachable!("Internal API misuse"),
+ }
+ }
+}
+
+/// The state necessary to perform address to line translation.
+///
+/// Constructing a `Context` is somewhat costly, so users should aim to reuse `Context`s
+/// when performing lookups for many addresses in the same executable.
+pub struct Context<R: gimli::Reader> {
+ sections: Arc<gimli::Dwarf<R>>,
+ unit_ranges: Box<[UnitRange]>,
+ units: Box<[ResUnit<R>]>,
+ sup_units: Box<[SupUnit<R>]>,
+}
+
+/// The type of `Context` that supports the `new` method.
+#[cfg(feature = "std-object")]
+pub type ObjectContext = Context<gimli::EndianRcSlice<gimli::RunTimeEndian>>;
+
+#[cfg(feature = "std-object")]
+impl Context<gimli::EndianRcSlice<gimli::RunTimeEndian>> {
+ /// Construct a new `Context`.
+ ///
+ /// The resulting `Context` uses `gimli::EndianRcSlice<gimli::RunTimeEndian>`.
+ /// This means it is not thread safe, has no lifetime constraints (since it copies
+ /// the input data), and works for any endianity.
+ ///
+ /// Performance sensitive applications may want to use `Context::from_dwarf`
+ /// with a more specialised `gimli::Reader` implementation.
+ #[inline]
+ pub fn new<'data: 'file, 'file, O: object::Object<'data, 'file>>(
+ file: &'file O,
+ ) -> Result<Self, Error> {
+ Self::new_with_sup(file, None)
+ }
+
+ /// Construct a new `Context`.
+ ///
+ /// Optionally also use a supplementary object file.
+ ///
+ /// The resulting `Context` uses `gimli::EndianRcSlice<gimli::RunTimeEndian>`.
+ /// This means it is not thread safe, has no lifetime constraints (since it copies
+ /// the input data), and works for any endianity.
+ ///
+ /// Performance sensitive applications may want to use `Context::from_dwarf`
+ /// with a more specialised `gimli::Reader` implementation.
+ pub fn new_with_sup<'data: 'file, 'file, O: object::Object<'data, 'file>>(
+ file: &'file O,
+ sup_file: Option<&'file O>,
+ ) -> Result<Self, Error> {
+ let endian = if file.is_little_endian() {
+ gimli::RunTimeEndian::Little
+ } else {
+ gimli::RunTimeEndian::Big
+ };
+
+ fn load_section<'data: 'file, 'file, O, Endian>(
+ id: gimli::SectionId,
+ file: &'file O,
+ endian: Endian,
+ ) -> Result<gimli::EndianRcSlice<Endian>, Error>
+ where
+ O: object::Object<'data, 'file>,
+ Endian: gimli::Endianity,
+ {
+ use object::ObjectSection;
+
+ let data = file
+ .section_by_name(id.name())
+ .and_then(|section| section.uncompressed_data().ok())
+ .unwrap_or(Cow::Borrowed(&[]));
+ Ok(gimli::EndianRcSlice::new(Rc::from(&*data), endian))
+ }
+
+ let mut dwarf = gimli::Dwarf::load(|id| load_section(id, file, endian))?;
+ if let Some(sup_file) = sup_file {
+ dwarf.load_sup(|id| load_section(id, sup_file, endian))?;
+ }
+ Context::from_dwarf(dwarf)
+ }
+}
+
+impl<R: gimli::Reader> Context<R> {
+ /// Construct a new `Context` from DWARF sections.
+ ///
+ /// This method does not support using a supplementary object file.
+ pub fn from_sections(
+ debug_abbrev: gimli::DebugAbbrev<R>,
+ debug_addr: gimli::DebugAddr<R>,
+ debug_aranges: gimli::DebugAranges<R>,
+ debug_info: gimli::DebugInfo<R>,
+ debug_line: gimli::DebugLine<R>,
+ debug_line_str: gimli::DebugLineStr<R>,
+ debug_ranges: gimli::DebugRanges<R>,
+ debug_rnglists: gimli::DebugRngLists<R>,
+ debug_str: gimli::DebugStr<R>,
+ debug_str_offsets: gimli::DebugStrOffsets<R>,
+ default_section: R,
+ ) -> Result<Self, Error> {
+ Self::from_dwarf(gimli::Dwarf {
+ debug_abbrev,
+ debug_addr,
+ debug_aranges,
+ debug_info,
+ debug_line,
+ debug_line_str,
+ debug_str,
+ debug_str_offsets,
+ debug_types: default_section.clone().into(),
+ locations: gimli::LocationLists::new(
+ default_section.clone().into(),
+ default_section.into(),
+ ),
+ ranges: gimli::RangeLists::new(debug_ranges, debug_rnglists),
+ file_type: gimli::DwarfFileType::Main,
+ sup: None,
+ abbreviations_cache: gimli::AbbreviationsCache::new(),
+ })
+ }
+
+ /// Construct a new `Context` from an existing [`gimli::Dwarf`] object.
+ #[inline]
+ pub fn from_dwarf(sections: gimli::Dwarf<R>) -> Result<Context<R>, Error> {
+ let sections = Arc::new(sections);
+ let (unit_ranges, units) = Context::parse_units(&sections)?;
+ let sup_units = if let Some(sup) = sections.sup.as_ref() {
+ Context::parse_sup(sup)?
+ } else {
+ Vec::new()
+ };
+ Ok(Context {
+ sections,
+ unit_ranges: unit_ranges.into_boxed_slice(),
+ units: units.into_boxed_slice(),
+ sup_units: sup_units.into_boxed_slice(),
+ })
+ }
+
+ /// Finds the CUs for the function address given.
+ ///
+ /// There might be multiple CUs whose range contains this address.
+ /// Weak symbols have shown up in the wild which cause this to happen
+ /// but otherwise this can happen if the CU has non-contiguous functions
+ /// but only reports a single range.
+ ///
+ /// Consequently we return an iterator for all CUs which may contain the
+ /// address, and the caller must check if there is actually a function or
+ /// location in the CU for that address.
+ fn find_units(&self, probe: u64) -> impl Iterator<Item = &ResUnit<R>> {
+ self.find_units_range(probe, probe + 1)
+ .map(|(unit, _range)| unit)
+ }
+
+ /// Finds the CUs covering the range of addresses given.
+ ///
+ /// The range is [low, high) (ie, the upper bound is exclusive). This can return multiple
+ /// ranges for the same unit.
+ #[inline]
+ fn find_units_range(
+ &self,
+ probe_low: u64,
+ probe_high: u64,
+ ) -> impl Iterator<Item = (&ResUnit<R>, &gimli::Range)> {
+ // First up find the position in the array which could have our function
+ // address.
+ let pos = match self
+ .unit_ranges
+ .binary_search_by_key(&probe_high, |i| i.range.begin)
+ {
+ // Although unlikely, we could find an exact match.
+ Ok(i) => i + 1,
+ // No exact match was found, but this probe would fit at slot `i`.
+ // This means that slot `i` is bigger than `probe`, along with all
+ // indices greater than `i`, so we need to search all previous
+ // entries.
+ Err(i) => i,
+ };
+
+ // Once we have our index we iterate backwards from that position
+ // looking for a matching CU.
+ self.unit_ranges[..pos]
+ .iter()
+ .rev()
+ .take_while(move |i| {
+ // We know that this CU's start is beneath the probe already because
+ // of our sorted array.
+ debug_assert!(i.range.begin <= probe_high);
+
+ // Each entry keeps track of the maximum end address seen so far,
+ // starting from the beginning of the array of unit ranges. We're
+ // iterating in reverse so if our probe is beyond the maximum range
+ // of this entry, then it's guaranteed to not fit in any prior
+ // entries, so we break out.
+ probe_low < i.max_end
+ })
+ .filter_map(move |i| {
+ // If this CU doesn't actually contain this address, move to the
+ // next CU.
+ if probe_low >= i.range.end || probe_high <= i.range.begin {
+ return None;
+ }
+ Some((&self.units[i.unit_id], &i.range))
+ })
+ }
+
+ /// Find the DWARF unit corresponding to the given virtual memory address.
+ pub fn find_dwarf_and_unit(
+ &self,
+ probe: u64,
+ ) -> LookupResult<
+ impl LookupContinuation<Output = Option<(&gimli::Dwarf<R>, &gimli::Unit<R>)>, Buf = R>,
+ > {
+ let mut units_iter = self.find_units(probe);
+ if let Some(unit) = units_iter.next() {
+ return LoopingLookup::new_lookup(
+ unit.find_function_or_location(probe, self),
+ move |r| {
+ ControlFlow::Break(match r {
+ Ok((Some(_), _)) | Ok((_, Some(_))) => {
+ let (_file, sections, unit) = unit
+ .dwarf_and_unit_dwo(self)
+ // We've already been through both error cases here to get to this point.
+ .unwrap()
+ .unwrap();
+ Some((sections, unit))
+ }
+ _ => match units_iter.next() {
+ Some(next_unit) => {
+ return ControlFlow::Continue(
+ next_unit.find_function_or_location(probe, self),
+ );
+ }
+ None => None,
+ },
+ })
+ },
+ );
+ }
+
+ LoopingLookup::new_complete(None)
+ }
+
+ /// Find the source file and line corresponding to the given virtual memory address.
+ pub fn find_location(&self, probe: u64) -> Result<Option<Location<'_>>, Error> {
+ for unit in self.find_units(probe) {
+ if let Some(location) = unit.find_location(probe, &self.sections)? {
+ return Ok(Some(location));
+ }
+ }
+ Ok(None)
+ }
+
+ /// Return source file and lines for a range of addresses. For each location it also
+ /// returns the address and size of the range of the underlying instructions.
+ pub fn find_location_range(
+ &self,
+ probe_low: u64,
+ probe_high: u64,
+ ) -> Result<LocationRangeIter<'_, R>, Error> {
+ LocationRangeIter::new(self, probe_low, probe_high)
+ }
+
+ /// Return an iterator for the function frames corresponding to the given virtual
+ /// memory address.
+ ///
+ /// If the probe address is not for an inline function then only one frame is
+ /// returned.
+ ///
+ /// If the probe address is for an inline function then the first frame corresponds
+ /// to the innermost inline function. Subsequent frames contain the caller and call
+ /// location, until an non-inline caller is reached.
+ pub fn find_frames(
+ &self,
+ probe: u64,
+ ) -> LookupResult<impl LookupContinuation<Output = Result<FrameIter<'_, R>, Error>, Buf = R>>
+ {
+ let mut units_iter = self.find_units(probe);
+ if let Some(unit) = units_iter.next() {
+ LoopingLookup::new_lookup(unit.find_function_or_location(probe, self), move |r| {
+ ControlFlow::Break(match r {
+ Err(e) => Err(e),
+ Ok((Some(function), location)) => {
+ let inlined_functions = function.find_inlined_functions(probe);
+ Ok(FrameIter(FrameIterState::Frames(FrameIterFrames {
+ unit,
+ sections: &self.sections,
+ function,
+ inlined_functions,
+ next: location,
+ })))
+ }
+ Ok((None, Some(location))) => {
+ Ok(FrameIter(FrameIterState::Location(Some(location))))
+ }
+ Ok((None, None)) => match units_iter.next() {
+ Some(next_unit) => {
+ return ControlFlow::Continue(
+ next_unit.find_function_or_location(probe, self),
+ );
+ }
+ None => Ok(FrameIter(FrameIterState::Empty)),
+ },
+ })
+ })
+ } else {
+ LoopingLookup::new_complete(Ok(FrameIter(FrameIterState::Empty)))
+ }
+ }
+
+ /// Preload units for `probe`.
+ ///
+ /// The iterator returns pairs of `SplitDwarfLoad`s containing the
+ /// information needed to locate and load split DWARF for `probe` and
+ /// a matching callback to invoke once that data is available.
+ ///
+ /// If this method is called, and all of the returned closures are invoked,
+ /// addr2line guarantees that any future API call for the address `probe`
+ /// will not require the loading of any split DWARF.
+ ///
+ /// ```no_run
+ /// # use addr2line::*;
+ /// # use std::sync::Arc;
+ /// # let ctx: Context<gimli::EndianRcSlice<gimli::RunTimeEndian>> = todo!();
+ /// # let do_split_dwarf_load = |load: SplitDwarfLoad<gimli::EndianRcSlice<gimli::RunTimeEndian>>| -> Option<Arc<gimli::Dwarf<gimli::EndianRcSlice<gimli::RunTimeEndian>>>> { None };
+ /// const ADDRESS: u64 = 0xdeadbeef;
+ /// ctx.preload_units(ADDRESS).for_each(|(load, callback)| {
+ /// let dwo = do_split_dwarf_load(load);
+ /// callback(dwo);
+ /// });
+ ///
+ /// let frames_iter = match ctx.find_frames(ADDRESS) {
+ /// LookupResult::Output(result) => result,
+ /// LookupResult::Load { .. } => unreachable!("addr2line promised we wouldn't get here"),
+ /// };
+ ///
+ /// // ...
+ /// ```
+ pub fn preload_units(
+ &'_ self,
+ probe: u64,
+ ) -> impl Iterator<
+ Item = (
+ SplitDwarfLoad<R>,
+ impl FnOnce(Option<Arc<gimli::Dwarf<R>>>) -> Result<(), gimli::Error> + '_,
+ ),
+ > {
+ self.find_units(probe)
+ .filter_map(move |unit| match unit.dwarf_and_unit_dwo(self) {
+ LookupResult::Output(_) => None,
+ LookupResult::Load { load, continuation } => Some((load, |result| {
+ continuation.resume(result).unwrap().map(|_| ())
+ })),
+ })
+ }
+
+ /// Initialize all line data structures. This is used for benchmarks.
+ #[doc(hidden)]
+ pub fn parse_lines(&self) -> Result<(), Error> {
+ for unit in self.units.iter() {
+ unit.parse_lines(&self.sections)?;
+ }
+ Ok(())
+ }
+
+ /// Initialize all function data structures. This is used for benchmarks.
+ #[doc(hidden)]
+ pub fn parse_functions(&self) -> Result<(), Error> {
+ for unit in self.units.iter() {
+ unit.parse_functions(self).skip_all_loads()?;
+ }
+ Ok(())
+ }
+
+ /// Initialize all inlined function data structures. This is used for benchmarks.
+ #[doc(hidden)]
+ pub fn parse_inlined_functions(&self) -> Result<(), Error> {
+ for unit in self.units.iter() {
+ unit.parse_inlined_functions(self).skip_all_loads()?;
+ }
+ Ok(())
+ }
+}
+
+struct UnitRange {
+ unit_id: usize,
+ max_end: u64,
+ range: gimli::Range,
+}
+
+struct ResUnit<R: gimli::Reader> {
+ offset: gimli::DebugInfoOffset<R::Offset>,
+ dw_unit: gimli::Unit<R>,
+ lang: Option<gimli::DwLang>,
+ lines: LazyCell<Result<Lines, Error>>,
+ funcs: LazyCell<Result<Functions<R>, Error>>,
+ dwo: LazyCell<Result<Option<Box<(Arc<gimli::Dwarf<R>>, gimli::Unit<R>)>>, Error>>,
+}
+
+struct SupUnit<R: gimli::Reader> {
+ offset: gimli::DebugInfoOffset<R::Offset>,
+ dw_unit: gimli::Unit<R>,
+}
+
+impl<R: gimli::Reader> Context<R> {
+ fn parse_units(sections: &gimli::Dwarf<R>) -> Result<(Vec<UnitRange>, Vec<ResUnit<R>>), Error> {
+ // Find all the references to compilation units in .debug_aranges.
+ // Note that we always also iterate through all of .debug_info to
+ // find compilation units, because .debug_aranges may be missing some.
+ let mut aranges = Vec::new();
+ let mut headers = sections.debug_aranges.headers();
+ while let Some(header) = headers.next()? {
+ aranges.push((header.debug_info_offset(), header.offset()));
+ }
+ aranges.sort_by_key(|i| i.0);
+
+ let mut unit_ranges = Vec::new();
+ let mut res_units = Vec::new();
+ let mut units = sections.units();
+ while let Some(header) = units.next()? {
+ let unit_id = res_units.len();
+ let offset = match header.offset().as_debug_info_offset() {
+ Some(offset) => offset,
+ None => continue,
+ };
+ // We mainly want compile units, but we may need to follow references to entries
+ // within other units for function names. We don't need anything from type units.
+ match header.type_() {
+ gimli::UnitType::Type { .. } | gimli::UnitType::SplitType { .. } => continue,
+ _ => {}
+ }
+ let dw_unit = match sections.unit(header) {
+ Ok(dw_unit) => dw_unit,
+ Err(_) => continue,
+ };
+
+ let mut lang = None;
+ let mut have_unit_range = false;
+ {
+ let mut entries = dw_unit.entries_raw(None)?;
+
+ let abbrev = match entries.read_abbreviation()? {
+ Some(abbrev) => abbrev,
+ None => continue,
+ };
+
+ let mut ranges = RangeAttributes::default();
+ for spec in abbrev.attributes() {
+ let attr = entries.read_attribute(*spec)?;
+ match attr.name() {
+ gimli::DW_AT_low_pc => match attr.value() {
+ gimli::AttributeValue::Addr(val) => ranges.low_pc = Some(val),
+ gimli::AttributeValue::DebugAddrIndex(index) => {
+ ranges.low_pc = Some(sections.address(&dw_unit, index)?);
+ }
+ _ => {}
+ },
+ gimli::DW_AT_high_pc => match attr.value() {
+ gimli::AttributeValue::Addr(val) => ranges.high_pc = Some(val),
+ gimli::AttributeValue::DebugAddrIndex(index) => {
+ ranges.high_pc = Some(sections.address(&dw_unit, index)?);
+ }
+ gimli::AttributeValue::Udata(val) => ranges.size = Some(val),
+ _ => {}
+ },
+ gimli::DW_AT_ranges => {
+ ranges.ranges_offset =
+ sections.attr_ranges_offset(&dw_unit, attr.value())?;
+ }
+ gimli::DW_AT_language => {
+ if let gimli::AttributeValue::Language(val) = attr.value() {
+ lang = Some(val);
+ }
+ }
+ _ => {}
+ }
+ }
+
+ // Find the address ranges for the CU, using in order of preference:
+ // - DW_AT_ranges
+ // - .debug_aranges
+ // - DW_AT_low_pc/DW_AT_high_pc
+ //
+ // Using DW_AT_ranges before .debug_aranges is possibly an arbitrary choice,
+ // but the feeling is that DW_AT_ranges is more likely to be reliable or complete
+ // if it is present.
+ //
+ // .debug_aranges must be used before DW_AT_low_pc/DW_AT_high_pc because
+ // it has been observed on macOS that DW_AT_ranges was not emitted even for
+ // discontiguous CUs.
+ let i = match ranges.ranges_offset {
+ Some(_) => None,
+ None => aranges.binary_search_by_key(&offset, |x| x.0).ok(),
+ };
+ if let Some(mut i) = i {
+ // There should be only one set per CU, but in practice multiple
+ // sets have been observed. This is probably a compiler bug, but
+ // either way we need to handle it.
+ while i > 0 && aranges[i - 1].0 == offset {
+ i -= 1;
+ }
+ for (_, aranges_offset) in aranges[i..].iter().take_while(|x| x.0 == offset) {
+ let aranges_header = sections.debug_aranges.header(*aranges_offset)?;
+ let mut aranges = aranges_header.entries();
+ while let Some(arange) = aranges.next()? {
+ if arange.length() != 0 {
+ unit_ranges.push(UnitRange {
+ range: arange.range(),
+ unit_id,
+ max_end: 0,
+ });
+ have_unit_range = true;
+ }
+ }
+ }
+ } else {
+ have_unit_range |= ranges.for_each_range(sections, &dw_unit, |range| {
+ unit_ranges.push(UnitRange {
+ range,
+ unit_id,
+ max_end: 0,
+ });
+ })?;
+ }
+ }
+
+ let lines = LazyCell::new();
+ if !have_unit_range {
+ // The unit did not declare any ranges.
+ // Try to get some ranges from the line program sequences.
+ if let Some(ref ilnp) = dw_unit.line_program {
+ if let Ok(lines) = lines
+ .borrow_with(|| Lines::parse(&dw_unit, ilnp.clone(), sections))
+ .as_ref()
+ {
+ for sequence in lines.sequences.iter() {
+ unit_ranges.push(UnitRange {
+ range: gimli::Range {
+ begin: sequence.start,
+ end: sequence.end,
+ },
+ unit_id,
+ max_end: 0,
+ })
+ }
+ }
+ }
+ }
+
+ res_units.push(ResUnit {
+ offset,
+ dw_unit,
+ lang,
+ lines,
+ funcs: LazyCell::new(),
+ dwo: LazyCell::new(),
+ });
+ }
+
+ // Sort this for faster lookup in `find_unit_and_address` below.
+ unit_ranges.sort_by_key(|i| i.range.begin);
+
+ // Calculate the `max_end` field now that we've determined the order of
+ // CUs.
+ let mut max = 0;
+ for i in unit_ranges.iter_mut() {
+ max = max.max(i.range.end);
+ i.max_end = max;
+ }
+
+ Ok((unit_ranges, res_units))
+ }
+
+ fn parse_sup(sections: &gimli::Dwarf<R>) -> Result<Vec<SupUnit<R>>, Error> {
+ let mut sup_units = Vec::new();
+ let mut units = sections.units();
+ while let Some(header) = units.next()? {
+ let offset = match header.offset().as_debug_info_offset() {
+ Some(offset) => offset,
+ None => continue,
+ };
+ let dw_unit = match sections.unit(header) {
+ Ok(dw_unit) => dw_unit,
+ Err(_) => continue,
+ };
+ sup_units.push(SupUnit { dw_unit, offset });
+ }
+ Ok(sup_units)
+ }
+
+ // Find the unit containing the given offset, and convert the offset into a unit offset.
+ fn find_unit(
+ &self,
+ offset: gimli::DebugInfoOffset<R::Offset>,
+ file: DebugFile,
+ ) -> Result<(&gimli::Unit<R>, gimli::UnitOffset<R::Offset>), Error> {
+ let unit = match file {
+ DebugFile::Primary => {
+ match self
+ .units
+ .binary_search_by_key(&offset.0, |unit| unit.offset.0)
+ {
+ // There is never a DIE at the unit offset or before the first unit.
+ Ok(_) | Err(0) => return Err(gimli::Error::NoEntryAtGivenOffset),
+ Err(i) => &self.units[i - 1].dw_unit,
+ }
+ }
+ DebugFile::Supplementary => {
+ match self
+ .sup_units
+ .binary_search_by_key(&offset.0, |unit| unit.offset.0)
+ {
+ // There is never a DIE at the unit offset or before the first unit.
+ Ok(_) | Err(0) => return Err(gimli::Error::NoEntryAtGivenOffset),
+ Err(i) => &self.sup_units[i - 1].dw_unit,
+ }
+ }
+ DebugFile::Dwo => return Err(gimli::Error::NoEntryAtGivenOffset),
+ };
+
+ let unit_offset = offset
+ .to_unit_offset(&unit.header)
+ .ok_or(gimli::Error::NoEntryAtGivenOffset)?;
+ Ok((unit, unit_offset))
+ }
+}
+
+struct Lines {
+ files: Box<[String]>,
+ sequences: Box<[LineSequence]>,
+}
+
+impl Lines {
+ fn parse<R: gimli::Reader>(
+ dw_unit: &gimli::Unit<R>,
+ ilnp: gimli::IncompleteLineProgram<R, R::Offset>,
+ sections: &gimli::Dwarf<R>,
+ ) -> Result<Self, Error> {
+ let mut sequences = Vec::new();
+ let mut sequence_rows = Vec::<LineRow>::new();
+ let mut rows = ilnp.rows();
+ while let Some((_, row)) = rows.next_row()? {
+ if row.end_sequence() {
+ if let Some(start) = sequence_rows.first().map(|x| x.address) {
+ let end = row.address();
+ let mut rows = Vec::new();
+ mem::swap(&mut rows, &mut sequence_rows);
+ sequences.push(LineSequence {
+ start,
+ end,
+ rows: rows.into_boxed_slice(),
+ });
+ }
+ continue;
+ }
+
+ let address = row.address();
+ let file_index = row.file_index();
+ let line = row.line().map(NonZeroU64::get).unwrap_or(0) as u32;
+ let column = match row.column() {
+ gimli::ColumnType::LeftEdge => 0,
+ gimli::ColumnType::Column(x) => x.get() as u32,
+ };
+
+ if let Some(last_row) = sequence_rows.last_mut() {
+ if last_row.address == address {
+ last_row.file_index = file_index;
+ last_row.line = line;
+ last_row.column = column;
+ continue;
+ }
+ }
+
+ sequence_rows.push(LineRow {
+ address,
+ file_index,
+ line,
+ column,
+ });
+ }
+ sequences.sort_by_key(|x| x.start);
+
+ let mut files = Vec::new();
+ let header = rows.header();
+ match header.file(0) {
+ Some(file) => files.push(render_file(dw_unit, file, header, sections)?),
+ None => files.push(String::from("")), // DWARF version <= 4 may not have 0th index
+ }
+ let mut index = 1;
+ while let Some(file) = header.file(index) {
+ files.push(render_file(dw_unit, file, header, sections)?);
+ index += 1;
+ }
+
+ Ok(Self {
+ files: files.into_boxed_slice(),
+ sequences: sequences.into_boxed_slice(),
+ })
+ }
+}
+
+fn render_file<R: gimli::Reader>(
+ dw_unit: &gimli::Unit<R>,
+ file: &gimli::FileEntry<R, R::Offset>,
+ header: &gimli::LineProgramHeader<R, R::Offset>,
+ sections: &gimli::Dwarf<R>,
+) -> Result<String, gimli::Error> {
+ let mut path = if let Some(ref comp_dir) = dw_unit.comp_dir {
+ comp_dir.to_string_lossy()?.into_owned()
+ } else {
+ String::new()
+ };
+
+ // The directory index 0 is defined to correspond to the compilation unit directory.
+ if file.directory_index() != 0 {
+ if let Some(directory) = file.directory(header) {
+ path_push(
+ &mut path,
+ sections
+ .attr_string(dw_unit, directory)?
+ .to_string_lossy()?
+ .as_ref(),
+ );
+ }
+ }
+
+ path_push(
+ &mut path,
+ sections
+ .attr_string(dw_unit, file.path_name())?
+ .to_string_lossy()?
+ .as_ref(),
+ );
+
+ Ok(path)
+}
+
+struct LineSequence {
+ start: u64,
+ end: u64,
+ rows: Box<[LineRow]>,
+}
+
+struct LineRow {
+ address: u64,
+ file_index: u64,
+ line: u32,
+ column: u32,
+}
+
+/// This struct contains the information needed to find split DWARF data
+/// and to produce a `gimli::Dwarf<R>` for it.
+pub struct SplitDwarfLoad<R> {
+ /// The dwo id, for looking up in a DWARF package, or for
+ /// verifying an unpacked dwo found on the file system
+ pub dwo_id: gimli::DwoId,
+ /// The compilation directory `path` is relative to.
+ pub comp_dir: Option<R>,
+ /// A path on the filesystem, relative to `comp_dir` to find this dwo.
+ pub path: Option<R>,
+ /// Once the split DWARF data is loaded, the loader is expected
+ /// to call [make_dwo(parent)](gimli::read::Dwarf::make_dwo) before
+ /// returning the data.
+ pub parent: Arc<gimli::Dwarf<R>>,
+}
+
+struct SimpleLookup<T, R, F>
+where
+ F: FnOnce(Option<Arc<gimli::Dwarf<R>>>) -> T,
+ R: gimli::Reader,
+{
+ f: F,
+ phantom: PhantomData<(T, R)>,
+}
+
+impl<T, R, F> SimpleLookup<T, R, F>
+where
+ F: FnOnce(Option<Arc<gimli::Dwarf<R>>>) -> T,
+ R: gimli::Reader,
+{
+ fn new_complete(t: F::Output) -> LookupResult<SimpleLookup<T, R, F>> {
+ LookupResult::Output(t)
+ }
+
+ fn new_needs_load(load: SplitDwarfLoad<R>, f: F) -> LookupResult<SimpleLookup<T, R, F>> {
+ LookupResult::Load {
+ load,
+ continuation: SimpleLookup {
+ f,
+ phantom: PhantomData,
+ },
+ }
+ }
+}
+
+impl<T, R, F> LookupContinuation for SimpleLookup<T, R, F>
+where
+ F: FnOnce(Option<Arc<gimli::Dwarf<R>>>) -> T,
+ R: gimli::Reader,
+{
+ type Output = T;
+ type Buf = R;
+
+ fn resume(self, v: Option<Arc<gimli::Dwarf<Self::Buf>>>) -> LookupResult<Self> {
+ LookupResult::Output((self.f)(v))
+ }
+}
+
+struct MappedLookup<T, L, F>
+where
+ L: LookupContinuation,
+ F: FnOnce(L::Output) -> T,
+{
+ original: L,
+ mutator: F,
+}
+
+impl<T, L, F> LookupContinuation for MappedLookup<T, L, F>
+where
+ L: LookupContinuation,
+ F: FnOnce(L::Output) -> T,
+{
+ type Output = T;
+ type Buf = L::Buf;
+
+ fn resume(self, v: Option<Arc<gimli::Dwarf<Self::Buf>>>) -> LookupResult<Self> {
+ match self.original.resume(v) {
+ LookupResult::Output(t) => LookupResult::Output((self.mutator)(t)),
+ LookupResult::Load { load, continuation } => LookupResult::Load {
+ load,
+ continuation: MappedLookup {
+ original: continuation,
+ mutator: self.mutator,
+ },
+ },
+ }
+ }
+}
+
+/// Some functions (e.g. `find_frames`) require considering multiple
+/// compilation units, each of which might require their own split DWARF
+/// lookup (and thus produce a continuation).
+///
+/// We store the underlying continuation here as well as a mutator function
+/// that will either a) decide that the result of this continuation is
+/// what is needed and mutate it to the final result or b) produce another
+/// `LookupResult`. `new_lookup` will in turn eagerly drive any non-continuation
+/// `LookupResult` with successive invocations of the mutator, until a new
+/// continuation or a final result is produced. And finally, the impl of
+/// `LookupContinuation::resume` will call `new_lookup` each time the
+/// computation is resumed.
+struct LoopingLookup<T, L, F>
+where
+ L: LookupContinuation,
+ F: FnMut(L::Output) -> ControlFlow<T, LookupResult<L>>,
+{
+ continuation: L,
+ mutator: F,
+}
+
+impl<T, L, F> LoopingLookup<T, L, F>
+where
+ L: LookupContinuation,
+ F: FnMut(L::Output) -> ControlFlow<T, LookupResult<L>>,
+{
+ fn new_complete(t: T) -> LookupResult<Self> {
+ LookupResult::Output(t)
+ }
+
+ fn new_lookup(mut r: LookupResult<L>, mut mutator: F) -> LookupResult<Self> {
+ // Drive the loop eagerly so that we only ever have to represent one state
+ // (the r == ControlFlow::Continue state) in LoopingLookup.
+ loop {
+ match r {
+ LookupResult::Output(l) => match mutator(l) {
+ ControlFlow::Break(t) => return LookupResult::Output(t),
+ ControlFlow::Continue(r2) => {
+ r = r2;
+ }
+ },
+ LookupResult::Load { load, continuation } => {
+ return LookupResult::Load {
+ load,
+ continuation: LoopingLookup {
+ continuation,
+ mutator,
+ },
+ };
+ }
+ }
+ }
+ }
+}
+
+impl<T, L, F> LookupContinuation for LoopingLookup<T, L, F>
+where
+ L: LookupContinuation,
+ F: FnMut(L::Output) -> ControlFlow<T, LookupResult<L>>,
+{
+ type Output = T;
+ type Buf = L::Buf;
+
+ fn resume(self, v: Option<Arc<gimli::Dwarf<Self::Buf>>>) -> LookupResult<Self> {
+ let r = self.continuation.resume(v);
+ LoopingLookup::new_lookup(r, self.mutator)
+ }
+}
+
+impl<R: gimli::Reader> ResUnit<R> {
+ fn dwarf_and_unit_dwo<'unit, 'ctx: 'unit>(
+ &'unit self,
+ ctx: &'ctx Context<R>,
+ ) -> LookupResult<
+ SimpleLookup<
+ Result<(DebugFile, &'unit gimli::Dwarf<R>, &'unit gimli::Unit<R>), Error>,
+ R,
+ impl FnOnce(
+ Option<Arc<gimli::Dwarf<R>>>,
+ )
+ -> Result<(DebugFile, &'unit gimli::Dwarf<R>, &'unit gimli::Unit<R>), Error>,
+ >,
+ > {
+ loop {
+ break SimpleLookup::new_complete(match self.dwo.borrow() {
+ Some(Ok(Some(v))) => Ok((DebugFile::Dwo, &*v.0, &v.1)),
+ Some(Ok(None)) => Ok((DebugFile::Primary, &*ctx.sections, &self.dw_unit)),
+ Some(Err(e)) => Err(*e),
+ None => {
+ let dwo_id = match self.dw_unit.dwo_id {
+ None => {
+ self.dwo.borrow_with(|| Ok(None));
+ continue;
+ }
+ Some(dwo_id) => dwo_id,
+ };
+
+ let comp_dir = self.dw_unit.comp_dir.clone();
+
+ let dwo_name = self.dw_unit.dwo_name().and_then(|s| {
+ if let Some(s) = s {
+ Ok(Some(ctx.sections.attr_string(&self.dw_unit, s)?))
+ } else {
+ Ok(None)
+ }
+ });
+
+ let path = match dwo_name {
+ Ok(v) => v,
+ Err(e) => {
+ self.dwo.borrow_with(|| Err(e));
+ continue;
+ }
+ };
+
+ let process_dwo = move |dwo_dwarf: Option<Arc<gimli::Dwarf<R>>>| {
+ let dwo_dwarf = match dwo_dwarf {
+ None => return Ok(None),
+ Some(dwo_dwarf) => dwo_dwarf,
+ };
+ let mut dwo_units = dwo_dwarf.units();
+ let dwo_header = match dwo_units.next()? {
+ Some(dwo_header) => dwo_header,
+ None => return Ok(None),
+ };
+
+ let mut dwo_unit = dwo_dwarf.unit(dwo_header)?;
+ dwo_unit.copy_relocated_attributes(&self.dw_unit);
+ Ok(Some(Box::new((dwo_dwarf, dwo_unit))))
+ };
+
+ return SimpleLookup::new_needs_load(
+ SplitDwarfLoad {
+ dwo_id,
+ comp_dir,
+ path,
+ parent: ctx.sections.clone(),
+ },
+ move |dwo_dwarf| match self.dwo.borrow_with(|| process_dwo(dwo_dwarf)) {
+ Ok(Some(v)) => Ok((DebugFile::Dwo, &*v.0, &v.1)),
+ Ok(None) => Ok((DebugFile::Primary, &*ctx.sections, &self.dw_unit)),
+ Err(e) => Err(*e),
+ },
+ );
+ }
+ });
+ }
+ }
+
+ fn parse_lines(&self, sections: &gimli::Dwarf<R>) -> Result<Option<&Lines>, Error> {
+ // NB: line information is always stored in the main debug file so this does not need
+ // to handle DWOs.
+ let ilnp = match self.dw_unit.line_program {
+ Some(ref ilnp) => ilnp,
+ None => return Ok(None),
+ };
+ self.lines
+ .borrow_with(|| Lines::parse(&self.dw_unit, ilnp.clone(), sections))
+ .as_ref()
+ .map(Some)
+ .map_err(Error::clone)
+ }
+
+ fn parse_functions_dwarf_and_unit(
+ &self,
+ unit: &gimli::Unit<R>,
+ sections: &gimli::Dwarf<R>,
+ ) -> Result<&Functions<R>, Error> {
+ self.funcs
+ .borrow_with(|| Functions::parse(unit, sections))
+ .as_ref()
+ .map_err(Error::clone)
+ }
+
+ fn parse_functions<'unit, 'ctx: 'unit>(
+ &'unit self,
+ ctx: &'ctx Context<R>,
+ ) -> LookupResult<impl LookupContinuation<Output = Result<&'unit Functions<R>, Error>, Buf = R>>
+ {
+ self.dwarf_and_unit_dwo(ctx).map(move |r| {
+ let (_file, sections, unit) = r?;
+ self.parse_functions_dwarf_and_unit(unit, sections)
+ })
+ }
+ fn parse_inlined_functions<'unit, 'ctx: 'unit>(
+ &'unit self,
+ ctx: &'ctx Context<R>,
+ ) -> LookupResult<impl LookupContinuation<Output = Result<(), Error>, Buf = R> + 'unit> {
+ self.dwarf_and_unit_dwo(ctx).map(move |r| {
+ let (file, sections, unit) = r?;
+ self.funcs
+ .borrow_with(|| Functions::parse(unit, sections))
+ .as_ref()
+ .map_err(Error::clone)?
+ .parse_inlined_functions(file, unit, ctx, sections)
+ })
+ }
+
+ fn find_location(
+ &self,
+ probe: u64,
+ sections: &gimli::Dwarf<R>,
+ ) -> Result<Option<Location<'_>>, Error> {
+ if let Some(mut iter) = LocationRangeUnitIter::new(self, sections, probe, probe + 1)? {
+ match iter.next() {
+ None => Ok(None),
+ Some((_addr, _len, loc)) => Ok(Some(loc)),
+ }
+ } else {
+ Ok(None)
+ }
+ }
+
+ #[inline]
+ fn find_location_range(
+ &self,
+ probe_low: u64,
+ probe_high: u64,
+ sections: &gimli::Dwarf<R>,
+ ) -> Result<Option<LocationRangeUnitIter<'_>>, Error> {
+ LocationRangeUnitIter::new(self, sections, probe_low, probe_high)
+ }
+
+ fn find_function_or_location<'unit, 'ctx: 'unit>(
+ &'unit self,
+ probe: u64,
+ ctx: &'ctx Context<R>,
+ ) -> LookupResult<
+ impl LookupContinuation<
+ Output = Result<(Option<&'unit Function<R>>, Option<Location<'unit>>), Error>,
+ Buf = R,
+ >,
+ > {
+ self.dwarf_and_unit_dwo(ctx).map(move |r| {
+ let (file, sections, unit) = r?;
+ let functions = self.parse_functions_dwarf_and_unit(unit, sections)?;
+ let function = match functions.find_address(probe) {
+ Some(address) => {
+ let function_index = functions.addresses[address].function;
+ let (offset, ref function) = functions.functions[function_index];
+ Some(
+ function
+ .borrow_with(|| Function::parse(offset, file, unit, ctx, sections))
+ .as_ref()
+ .map_err(Error::clone)?,
+ )
+ }
+ None => None,
+ };
+ let location = self.find_location(probe, sections)?;
+ Ok((function, location))
+ })
+ }
+}
+
+/// Iterator over `Location`s in a range of addresses, returned by `Context::find_location_range`.
+pub struct LocationRangeIter<'ctx, R: gimli::Reader> {
+ unit_iter: Box<dyn Iterator<Item = (&'ctx ResUnit<R>, &'ctx gimli::Range)> + 'ctx>,
+ iter: Option<LocationRangeUnitIter<'ctx>>,
+
+ probe_low: u64,
+ probe_high: u64,
+ sections: &'ctx gimli::Dwarf<R>,
+}
+
+impl<'ctx, R: gimli::Reader> LocationRangeIter<'ctx, R> {
+ #[inline]
+ fn new(ctx: &'ctx Context<R>, probe_low: u64, probe_high: u64) -> Result<Self, Error> {
+ let sections = &ctx.sections;
+ let unit_iter = ctx.find_units_range(probe_low, probe_high);
+ Ok(Self {
+ unit_iter: Box::new(unit_iter),
+ iter: None,
+ probe_low,
+ probe_high,
+ sections,
+ })
+ }
+
+ fn next_loc(&mut self) -> Result<Option<(u64, u64, Location<'ctx>)>, Error> {
+ loop {
+ let iter = self.iter.take();
+ match iter {
+ None => match self.unit_iter.next() {
+ Some((unit, range)) => {
+ self.iter = unit.find_location_range(
+ cmp::max(self.probe_low, range.begin),
+ cmp::min(self.probe_high, range.end),
+ self.sections,
+ )?;
+ }
+ None => return Ok(None),
+ },
+ Some(mut iter) => {
+ if let item @ Some(_) = iter.next() {
+ self.iter = Some(iter);
+ return Ok(item);
+ }
+ }
+ }
+ }
+ }
+}
+
+impl<'ctx, R> Iterator for LocationRangeIter<'ctx, R>
+where
+ R: gimli::Reader + 'ctx,
+{
+ type Item = (u64, u64, Location<'ctx>);
+
+ #[inline]
+ fn next(&mut self) -> Option<Self::Item> {
+ match self.next_loc() {
+ Err(_) => None,
+ Ok(loc) => loc,
+ }
+ }
+}
+
+#[cfg(feature = "fallible-iterator")]
+impl<'ctx, R> fallible_iterator::FallibleIterator for LocationRangeIter<'ctx, R>
+where
+ R: gimli::Reader + 'ctx,
+{
+ type Item = (u64, u64, Location<'ctx>);
+ type Error = Error;
+
+ #[inline]
+ fn next(&mut self) -> Result<Option<Self::Item>, Self::Error> {
+ self.next_loc()
+ }
+}
+
+struct LocationRangeUnitIter<'ctx> {
+ lines: &'ctx Lines,
+ seqs: &'ctx [LineSequence],
+ seq_idx: usize,
+ row_idx: usize,
+ probe_high: u64,
+}
+
+impl<'ctx> LocationRangeUnitIter<'ctx> {
+ fn new<R: gimli::Reader>(
+ resunit: &'ctx ResUnit<R>,
+ sections: &gimli::Dwarf<R>,
+ probe_low: u64,
+ probe_high: u64,
+ ) -> Result<Option<Self>, Error> {
+ let lines = resunit.parse_lines(sections)?;
+
+ if let Some(lines) = lines {
+ // Find index for probe_low.
+ let seq_idx = lines.sequences.binary_search_by(|sequence| {
+ if probe_low < sequence.start {
+ Ordering::Greater
+ } else if probe_low >= sequence.end {
+ Ordering::Less
+ } else {
+ Ordering::Equal
+ }
+ });
+ let seq_idx = match seq_idx {
+ Ok(x) => x,
+ Err(0) => 0, // probe below sequence, but range could overlap
+ Err(_) => lines.sequences.len(),
+ };
+
+ let row_idx = if let Some(seq) = lines.sequences.get(seq_idx) {
+ let idx = seq.rows.binary_search_by(|row| row.address.cmp(&probe_low));
+ match idx {
+ Ok(x) => x,
+ Err(0) => 0, // probe below sequence, but range could overlap
+ Err(x) => x - 1,
+ }
+ } else {
+ 0
+ };
+
+ Ok(Some(Self {
+ lines,
+ seqs: &*lines.sequences,
+ seq_idx,
+ row_idx,
+ probe_high,
+ }))
+ } else {
+ Ok(None)
+ }
+ }
+}
+
+impl<'ctx> Iterator for LocationRangeUnitIter<'ctx> {
+ type Item = (u64, u64, Location<'ctx>);
+
+ fn next(&mut self) -> Option<(u64, u64, Location<'ctx>)> {
+ while let Some(seq) = self.seqs.get(self.seq_idx) {
+ if seq.start >= self.probe_high {
+ break;
+ }
+
+ match seq.rows.get(self.row_idx) {
+ Some(row) => {
+ if row.address >= self.probe_high {
+ break;
+ }
+
+ let file = self
+ .lines
+ .files
+ .get(row.file_index as usize)
+ .map(String::as_str);
+ let nextaddr = seq
+ .rows
+ .get(self.row_idx + 1)
+ .map(|row| row.address)
+ .unwrap_or(seq.end);
+
+ let item = (
+ row.address,
+ nextaddr - row.address,
+ Location {
+ file,
+ line: if row.line != 0 { Some(row.line) } else { None },
+ column: if row.column != 0 {
+ Some(row.column)
+ } else {
+ None
+ },
+ },
+ );
+ self.row_idx += 1;
+
+ return Some(item);
+ }
+ None => {
+ self.seq_idx += 1;
+ self.row_idx = 0;
+ }
+ }
+ }
+ None
+ }
+}
+
+fn path_push(path: &mut String, p: &str) {
+ if has_unix_root(p) || has_windows_root(p) {
+ *path = p.to_string();
+ } else {
+ let dir_separator = if has_windows_root(path.as_str()) {
+ '\\'
+ } else {
+ '/'
+ };
+
+ if !path.is_empty() && !path.ends_with(dir_separator) {
+ path.push(dir_separator);
+ }
+ *path += p;
+ }
+}
+
+/// Check if the path in the given string has a unix style root
+fn has_unix_root(p: &str) -> bool {
+ p.starts_with('/')
+}
+
+/// Check if the path in the given string has a windows style root
+fn has_windows_root(p: &str) -> bool {
+ p.starts_with('\\') || p.get(1..3) == Some(":\\")
+}
+struct RangeAttributes<R: gimli::Reader> {
+ low_pc: Option<u64>,
+ high_pc: Option<u64>,
+ size: Option<u64>,
+ ranges_offset: Option<gimli::RangeListsOffset<<R as gimli::Reader>::Offset>>,
+}
+
+impl<R: gimli::Reader> Default for RangeAttributes<R> {
+ fn default() -> Self {
+ RangeAttributes {
+ low_pc: None,
+ high_pc: None,
+ size: None,
+ ranges_offset: None,
+ }
+ }
+}
+
+impl<R: gimli::Reader> RangeAttributes<R> {
+ fn for_each_range<F: FnMut(gimli::Range)>(
+ &self,
+ sections: &gimli::Dwarf<R>,
+ unit: &gimli::Unit<R>,
+ mut f: F,
+ ) -> Result<bool, Error> {
+ let mut added_any = false;
+ let mut add_range = |range: gimli::Range| {
+ if range.begin < range.end {
+ f(range);
+ added_any = true
+ }
+ };
+ if let Some(ranges_offset) = self.ranges_offset {
+ let mut range_list = sections.ranges(unit, ranges_offset)?;
+ while let Some(range) = range_list.next()? {
+ add_range(range);
+ }
+ } else if let (Some(begin), Some(end)) = (self.low_pc, self.high_pc) {
+ add_range(gimli::Range { begin, end });
+ } else if let (Some(begin), Some(size)) = (self.low_pc, self.size) {
+ add_range(gimli::Range {
+ begin,
+ end: begin + size,
+ });
+ }
+ Ok(added_any)
+ }
+}
+
+/// An iterator over function frames.
+pub struct FrameIter<'ctx, R>(FrameIterState<'ctx, R>)
+where
+ R: gimli::Reader;
+
+enum FrameIterState<'ctx, R>
+where
+ R: gimli::Reader,
+{
+ Empty,
+ Location(Option<Location<'ctx>>),
+ Frames(FrameIterFrames<'ctx, R>),
+}
+
+struct FrameIterFrames<'ctx, R>
+where
+ R: gimli::Reader,
+{
+ unit: &'ctx ResUnit<R>,
+ sections: &'ctx gimli::Dwarf<R>,
+ function: &'ctx Function<R>,
+ inlined_functions: iter::Rev<maybe_small::IntoIter<&'ctx InlinedFunction<R>>>,
+ next: Option<Location<'ctx>>,
+}
+
+impl<'ctx, R> FrameIter<'ctx, R>
+where
+ R: gimli::Reader + 'ctx,
+{
+ /// Advances the iterator and returns the next frame.
+ pub fn next(&mut self) -> Result<Option<Frame<'ctx, R>>, Error> {
+ let frames = match &mut self.0 {
+ FrameIterState::Empty => return Ok(None),
+ FrameIterState::Location(location) => {
+ // We can't move out of a mutable reference, so use `take` instead.
+ let location = location.take();
+ self.0 = FrameIterState::Empty;
+ return Ok(Some(Frame {
+ dw_die_offset: None,
+ function: None,
+ location,
+ }));
+ }
+ FrameIterState::Frames(frames) => frames,
+ };
+
+ let loc = frames.next.take();
+ let func = match frames.inlined_functions.next() {
+ Some(func) => func,
+ None => {
+ let frame = Frame {
+ dw_die_offset: Some(frames.function.dw_die_offset),
+ function: frames.function.name.clone().map(|name| FunctionName {
+ name,
+ language: frames.unit.lang,
+ }),
+ location: loc,
+ };
+ self.0 = FrameIterState::Empty;
+ return Ok(Some(frame));
+ }
+ };
+
+ let mut next = Location {
+ file: None,
+ line: if func.call_line != 0 {
+ Some(func.call_line)
+ } else {
+ None
+ },
+ column: if func.call_column != 0 {
+ Some(func.call_column)
+ } else {
+ None
+ },
+ };
+ if let Some(call_file) = func.call_file {
+ if let Some(lines) = frames.unit.parse_lines(frames.sections)? {
+ next.file = lines.files.get(call_file as usize).map(String::as_str);
+ }
+ }
+ frames.next = Some(next);
+
+ Ok(Some(Frame {
+ dw_die_offset: Some(func.dw_die_offset),
+ function: func.name.clone().map(|name| FunctionName {
+ name,
+ language: frames.unit.lang,
+ }),
+ location: loc,
+ }))
+ }
+}
+
+#[cfg(feature = "fallible-iterator")]
+impl<'ctx, R> fallible_iterator::FallibleIterator for FrameIter<'ctx, R>
+where
+ R: gimli::Reader + 'ctx,
+{
+ type Item = Frame<'ctx, R>;
+ type Error = Error;
+
+ #[inline]
+ fn next(&mut self) -> Result<Option<Frame<'ctx, R>>, Error> {
+ self.next()
+ }
+}
+
+/// A function frame.
+pub struct Frame<'ctx, R: gimli::Reader> {
+ /// The DWARF unit offset corresponding to the DIE of the function.
+ pub dw_die_offset: Option<gimli::UnitOffset<R::Offset>>,
+ /// The name of the function.
+ pub function: Option<FunctionName<R>>,
+ /// The source location corresponding to this frame.
+ pub location: Option<Location<'ctx>>,
+}
+
+/// A function name.
+pub struct FunctionName<R: gimli::Reader> {
+ /// The name of the function.
+ pub name: R,
+ /// The language of the compilation unit containing this function.
+ pub language: Option<gimli::DwLang>,
+}
+
+impl<R: gimli::Reader> FunctionName<R> {
+ /// The raw name of this function before demangling.
+ pub fn raw_name(&self) -> Result<Cow<'_, str>, Error> {
+ self.name.to_string_lossy()
+ }
+
+ /// The name of this function after demangling (if applicable).
+ pub fn demangle(&self) -> Result<Cow<'_, str>, Error> {
+ self.raw_name().map(|x| demangle_auto(x, self.language))
+ }
+}
+
+/// Demangle a symbol name using the demangling scheme for the given language.
+///
+/// Returns `None` if demangling failed or is not required.
+#[allow(unused_variables)]
+pub fn demangle(name: &str, language: gimli::DwLang) -> Option<String> {
+ match language {
+ #[cfg(feature = "rustc-demangle")]
+ gimli::DW_LANG_Rust => rustc_demangle::try_demangle(name)
+ .ok()
+ .as_ref()
+ .map(|x| format!("{:#}", x)),
+ #[cfg(feature = "cpp_demangle")]
+ gimli::DW_LANG_C_plus_plus
+ | gimli::DW_LANG_C_plus_plus_03
+ | gimli::DW_LANG_C_plus_plus_11
+ | gimli::DW_LANG_C_plus_plus_14 => cpp_demangle::Symbol::new(name)
+ .ok()
+ .and_then(|x| x.demangle(&Default::default()).ok()),
+ _ => None,
+ }
+}
+
+/// Apply 'best effort' demangling of a symbol name.
+///
+/// If `language` is given, then only the demangling scheme for that language
+/// is used.
+///
+/// If `language` is `None`, then heuristics are used to determine how to
+/// demangle the name. Currently, these heuristics are very basic.
+///
+/// If demangling fails or is not required, then `name` is returned unchanged.
+pub fn demangle_auto(name: Cow<'_, str>, language: Option<gimli::DwLang>) -> Cow<'_, str> {
+ match language {
+ Some(language) => demangle(name.as_ref(), language),
+ None => demangle(name.as_ref(), gimli::DW_LANG_Rust)
+ .or_else(|| demangle(name.as_ref(), gimli::DW_LANG_C_plus_plus)),
+ }
+ .map(Cow::from)
+ .unwrap_or(name)
+}
+
+/// A source location.
+pub struct Location<'a> {
+ /// The file name.
+ pub file: Option<&'a str>,
+ /// The line number.
+ pub line: Option<u32>,
+ /// The column number.
+ pub column: Option<u32>,
+}
+
+#[cfg(test)]
+mod tests {
+ #[test]
+ fn context_is_send() {
+ fn assert_is_send<T: Send>() {}
+ assert_is_send::<crate::Context<gimli::read::EndianSlice<'_, gimli::LittleEndian>>>();
+ }
+}
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