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//! A lazy, zero-copy parser for the DWARF debugging information format. //! //! * **Zero-copy:** everything is just a reference to the original input //! buffer. No copies of the input data ever get made. //! //! * **Lazy:** only the compilation units' entries that you iterate over get //! parsed, and only as deep as you ask. Skip over a compilation unit and its //! entries don't get parsed. //! //! * **Cross-platform:** `gimli` isn't coupled to any platform or object file //! format. Use your own ELF parser on Linux or a Mach-O parser on OSX. //! //! * Unsure which object file parser to use? Try the cross-platform //! [`object`](https://github.com/gimli-rs/object) crate. //! //! This library primarily targets the fourth edition of the standard (the most //! recent, at time of writing). //! //! ## Example Usage //! //! Print out all of the functions in the debuggee program: //! //! ```rust,no_run //! extern crate gimli; //! //! # fn example() -> Result<(), gimli::Error> { //! # let debug_info_buf = []; //! # let debug_abbrev_buf = []; //! # let read_debug_info = || &debug_info_buf; //! # let read_debug_abbrev = || &debug_abbrev_buf; //! // Read the .debug_info and .debug_abbrev sections with whatever object //! // loader you're using. //! let endian = gimli::LittleEndian; //! let debug_info = gimli::DebugInfo::new(read_debug_info(), endian); //! let debug_abbrev = gimli::DebugAbbrev::new(read_debug_abbrev(), endian); //! //! // Iterate over all compilation units. //! let mut iter = debug_info.units(); //! while let Some(unit) = try!(iter.next()) { //! // Parse the abbreviations for this compilation unit. //! let abbrevs = try!(unit.abbreviations(&debug_abbrev)); //! //! // Iterate over all of this compilation unit's entries. //! let mut entries = unit.entries(&abbrevs); //! while let Some((_, entry)) = try!(entries.next_dfs()) { //! // If we find an entry for a function, print it. //! if entry.tag() == gimli::DW_TAG_subprogram { //! println!("Found a function: {:?}", entry); //! } //! } //! } //! # unreachable!() //! # } //! ``` //! //! See the [example //! programs](https://github.com/gimli-rs/gimli/blob/master/examples/) for //! complete examples. //! //! ## API Structure //! //! * Basic familiarity with DWARF is assumed. //! //! * Each section gets its own type. Consider these types the entry points to //! the library: //! //! * [`DebugAbbrev`](./struct.DebugAbbrev.html): The `.debug_abbrev` section. //! //! * [`DebugAranges`](./struct.DebugAranges.html): The `.debug_aranges` //! section. //! //! * [`DebugFrame`](./struct.DebugFrame.html): The `.debug_frame` section. //! //! * [`DebugInfo`](./struct.DebugInfo.html): The `.debug_info` section. //! //! * [`DebugLine`](./struct.DebugLine.html): The `.debug_line` section. //! //! * [`DebugLoc`](./struct.DebugLoc.html): The `.debug_loc` section. //! //! * [`DebugPubNames`](./struct.DebugPubNames.html): The `.debug_pubnames` //! section. //! //! * [`DebugPubTypes`](./struct.DebugPubTypes.html): The `.debug_pubtypes` //! section. //! //! * [`DebugRanges`](./struct.DebugRanges.html): The `.debug_ranges` section. //! //! * [`DebugStr`](./struct.DebugStr.html): The `.debug_str` section. //! //! * [`DebugTypes`](./struct.DebugTypes.html): The `.debug_types` section. //! //! * [`EhFrame`](./struct.EhFrame.html): The `.eh_frame` section. //! //! * [`EhFrameHdr`](./struct.EhFrameHdr.html): The `.eh_frame_hdr` section. //! //! * Each section type exposes methods for accessing the debugging data encoded //! in that section. For example, the [`DebugInfo`](./struct.DebugInfo.html) //! struct has the [`units`](./struct.DebugInfo.html#method.units) method for //! iterating over the compilation units defined within it. //! //! * Offsets into a section are strongly typed: an offset into `.debug_info` is //! the [`DebugInfoOffset`](./struct.DebugInfoOffset.html) type. It cannot be //! used to index into the [`DebugLine`](./struct.DebugLine.html) type because //! `DebugLine` represents the `.debug_line` section. There are similar types //! for offsets relative to a compilation unit rather than a section. //! //! ## Using with `FallibleIterator` //! //! The standard library's `Iterator` trait and related APIs do not play well //! with iterators where the `next` operation is fallible. One can make the //! `Iterator`'s associated `Item` type be a `Result<T, E>`, however the //! provided methods cannot gracefully handle the case when an `Err` is //! returned. //! //! This situation led to the //! [`fallible-iterator`](https://crates.io/crates/fallible-iterator) crate's //! existence. You can read more of the rationale for its existence in its //! docs. The crate provides the helpers you have come to expect (eg `map`, //! `filter`, etc) for iterators that can fail. //! //! `gimli`'s many lazy parsing iterators are a perfect match for the //! `fallible-iterator` crate's `FallibleIterator` trait because parsing is not //! done eagerly. Parse errors later in the input might only be discovered after //! having iterated through many items. //! //! To use `gimli` iterators with `FallibleIterator`, import the crate and trait //! into your code: //! //! ``` //! // Add the `fallible-iterator` crate. Don't forget to add it to your //! // `Cargo.toml`, too! //! extern crate fallible_iterator; //! extern crate gimli; //! //! // Use the `FallibleIterator` trait so its methods are in scope! //! use fallible_iterator::FallibleIterator; //! use gimli::{DebugAranges, EndianBuf, LittleEndian}; //! //! fn find_sum_of_address_range_lengths(aranges: DebugAranges<EndianBuf<LittleEndian>>) //! -> gimli::Result<u64> //! { //! // `DebugAranges::items` returns a `FallibleIterator`! //! aranges.items() //! // `map` is provided by `FallibleIterator`! //! .map(|arange| arange.length()) //! // `fold` is provided by `FallibleIterator`! //! .fold(0, |sum, len| sum + len) //! } //! //! # fn main() {} //! ``` #![deny(missing_docs)] #![deny(missing_debug_implementations)] // Allow clippy warnings when we aren't building with clippy. #![allow(unknown_lints)] // False positives with `fallible_iterator`. #![allow(should_implement_trait)] // Many false positives involving `continue`. #![allow(never_loop)] // False positives when block expressions are used inside an assertion. #![allow(panic_params)] extern crate arrayvec; extern crate byteorder; extern crate fallible_iterator; mod cfi; pub use cfi::*; mod constants; pub use constants::*; mod endianity; pub use endianity::{BigEndian, EndianBuf, Endianity, LittleEndian, NativeEndian, RunTimeEndian}; pub mod leb128; mod parser; pub use parser::{Error, Format, Result}; pub use parser::{DebugMacinfoOffset, Pointer}; mod reader; pub use reader::{Reader, ReaderOffset}; mod abbrev; pub use abbrev::{Abbreviation, Abbreviations, AttributeSpecification, DebugAbbrev, DebugAbbrevOffset}; mod aranges; pub use aranges::{ArangeEntry, ArangeEntryIter, DebugAranges}; mod line; pub use line::*; mod loc; pub use loc::{DebugLoc, DebugLocOffset, LocationListEntry, LocationListIter, RawLocationListIter}; mod lookup; mod op; pub use op::*; mod pubnames; pub use pubnames::{DebugPubNames, PubNamesEntry, PubNamesEntryIter}; mod pubtypes; pub use pubtypes::{DebugPubTypes, PubTypesEntry, PubTypesEntryIter}; mod ranges; pub use ranges::{DebugRanges, DebugRangesOffset, Range, RangesIter, RawRangesIter}; mod str; pub use str::*; #[cfg(test)] mod test_util; mod unit; pub use unit::{CompilationUnitHeader, CompilationUnitHeadersIter, DebugInfo, DebugInfoOffset, UnitOffset}; pub use unit::{DebugTypeSignature, DebugTypes, DebugTypesOffset, TypeUnitHeader, TypeUnitHeadersIter}; pub use unit::{DebuggingInformationEntry, EntriesCursor, EntriesTree, EntriesTreeIter, EntriesTreeNode}; pub use unit::{Attribute, AttributeValue, AttrsIter}; /// A convenience trait for loading DWARF sections from object files. To be /// used like: /// /// ``` /// use gimli::{DebugInfo, EndianBuf, LittleEndian, Reader, Section}; /// /// fn load_section<R, S, F>(loader: F) -> S /// where R: Reader, S: Section<R>, F: FnOnce(&'static str) -> R /// { /// let data = loader(S::section_name()); /// S::from(data) /// } /// /// let buf = [0x00, 0x01, 0x02, 0x03]; /// let reader = EndianBuf::new(&buf, LittleEndian); /// /// let debug_info: DebugInfo<_> = load_section(|_: &'static str| reader); /// ``` pub trait Section<R: Reader>: From<R> { /// Returns the ELF section name for this type. fn section_name() -> &'static str; }