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use gimli::{ DebugAbbrev, DebugAddr, DebugInfo, DebugLine, DebugLineStr, DebugLoc, DebugLocLists, DebugRanges, DebugRngLists, DebugStr, DebugStrOffsets, DebugTypes, EndianSlice, LittleEndian, LocationLists, RangeLists, }; use std::collections::HashMap; use std::path::PathBuf; use wasmparser::{self, ModuleReader, SectionCode}; trait Reader: gimli::Reader<Offset = usize, Endian = LittleEndian> {} impl<'input> Reader for gimli::EndianSlice<'input, LittleEndian> {} pub use wasmparser::Type as WasmType; pub type Dwarf<'input> = gimli::Dwarf<gimli::EndianSlice<'input, LittleEndian>>; #[derive(Debug)] pub struct FunctionMetadata { pub params: Box<[WasmType]>, pub locals: Box<[(u32, WasmType)]>, } #[derive(Debug)] pub struct WasmFileInfo { pub path: Option<PathBuf>, pub code_section_offset: u64, pub funcs: Box<[FunctionMetadata]>, } #[derive(Debug)] pub struct NameSection { pub module_name: Option<String>, pub func_names: HashMap<u32, String>, pub locals_names: HashMap<u32, HashMap<u32, String>>, } #[derive(Debug)] pub struct DebugInfoData<'a> { pub dwarf: Dwarf<'a>, pub name_section: Option<NameSection>, pub wasm_file: WasmFileInfo, } fn convert_sections<'a>(sections: HashMap<&str, &'a [u8]>) -> Dwarf<'a> { const EMPTY_SECTION: &[u8] = &[]; let endian = LittleEndian; let debug_str = DebugStr::new(sections.get(".debug_str").unwrap_or(&EMPTY_SECTION), endian); let debug_abbrev = DebugAbbrev::new( sections.get(".debug_abbrev").unwrap_or(&EMPTY_SECTION), endian, ); let debug_info = DebugInfo::new( sections.get(".debug_info").unwrap_or(&EMPTY_SECTION), endian, ); let debug_line = DebugLine::new( sections.get(".debug_line").unwrap_or(&EMPTY_SECTION), endian, ); if sections.contains_key(".debug_addr") { panic!("Unexpected .debug_addr"); } let debug_addr = DebugAddr::from(EndianSlice::new(EMPTY_SECTION, endian)); if sections.contains_key(".debug_line_str") { panic!("Unexpected .debug_line_str"); } let debug_line_str = DebugLineStr::from(EndianSlice::new(EMPTY_SECTION, endian)); let debug_str_sup = DebugStr::from(EndianSlice::new(EMPTY_SECTION, endian)); if sections.contains_key(".debug_rnglists") { panic!("Unexpected .debug_rnglists"); } let debug_ranges = match sections.get(".debug_ranges") { Some(section) => DebugRanges::new(section, endian), None => DebugRanges::new(EMPTY_SECTION, endian), }; let debug_rnglists = DebugRngLists::new(EMPTY_SECTION, endian); let ranges = RangeLists::new(debug_ranges, debug_rnglists); if sections.contains_key(".debug_loclists") { panic!("Unexpected .debug_loclists"); } let debug_loc = match sections.get(".debug_loc") { Some(section) => DebugLoc::new(section, endian), None => DebugLoc::new(EMPTY_SECTION, endian), }; let debug_loclists = DebugLocLists::new(EMPTY_SECTION, endian); let locations = LocationLists::new(debug_loc, debug_loclists); if sections.contains_key(".debug_str_offsets") { panic!("Unexpected .debug_str_offsets"); } let debug_str_offsets = DebugStrOffsets::from(EndianSlice::new(EMPTY_SECTION, endian)); if sections.contains_key(".debug_types") { panic!("Unexpected .debug_types"); } let debug_types = DebugTypes::from(EndianSlice::new(EMPTY_SECTION, endian)); Dwarf { debug_abbrev, debug_addr, debug_info, debug_line, debug_line_str, debug_str, debug_str_offsets, debug_str_sup, debug_types, locations, ranges, } } fn read_name_section(reader: wasmparser::NameSectionReader) -> wasmparser::Result<NameSection> { let mut module_name = None; let mut func_names = HashMap::new(); let mut locals_names = HashMap::new(); for i in reader.into_iter() { match i? { wasmparser::Name::Module(m) => { module_name = Some(String::from(m.get_name()?)); } wasmparser::Name::Function(f) => { let mut reader = f.get_map()?; while let Ok(naming) = reader.read() { func_names.insert(naming.index, String::from(naming.name)); } } wasmparser::Name::Local(l) => { let mut reader = l.get_function_local_reader()?; while let Ok(f) = reader.read() { let mut names = HashMap::new(); let mut reader = f.get_map()?; while let Ok(naming) = reader.read() { names.insert(naming.index, String::from(naming.name)); } locals_names.insert(f.func_index, names); } } } } let result = NameSection { module_name, func_names, locals_names, }; Ok(result) } pub fn read_debuginfo(data: &[u8]) -> DebugInfoData { let mut reader = ModuleReader::new(data).expect("reader"); let mut sections = HashMap::new(); let mut name_section = None; let mut code_section_offset = 0; let mut signatures_params: Vec<Box<[WasmType]>> = Vec::new(); let mut func_params_refs: Vec<usize> = Vec::new(); let mut func_locals: Vec<Box<[(u32, WasmType)]>> = Vec::new(); while !reader.eof() { let section = reader.read().expect("section"); match section.code { SectionCode::Custom { name, .. } => { if name.starts_with(".debug_") { let mut reader = section.get_binary_reader(); let len = reader.bytes_remaining(); sections.insert(name, reader.read_bytes(len).expect("bytes")); } if name == "name" { if let Ok(reader) = section.get_name_section_reader() { if let Ok(section) = read_name_section(reader) { name_section = Some(section); } } } } SectionCode::Type => { signatures_params = section .get_type_section_reader() .expect("type section") .into_iter() .map(|ft| ft.expect("type").params) .collect::<Vec<_>>(); } SectionCode::Function => { func_params_refs = section .get_function_section_reader() .expect("function section") .into_iter() .map(|index| index.expect("func index") as usize) .collect::<Vec<_>>(); } SectionCode::Code => { code_section_offset = section.range().start as u64; func_locals = section .get_code_section_reader() .expect("code section") .into_iter() .map(|body| { let locals = body .expect("body") .get_locals_reader() .expect("locals reader"); locals .into_iter() .collect::<Result<Vec<_>, _>>() .expect("locals data") .into_boxed_slice() }) .collect::<Vec<_>>(); } _ => (), } } let func_meta = func_params_refs .into_iter() .zip(func_locals.into_iter()) .map(|(params_index, locals)| FunctionMetadata { params: signatures_params[params_index].clone(), locals, }) .collect::<Vec<_>>(); DebugInfoData { dwarf: convert_sections(sections), name_section, wasm_file: WasmFileInfo { path: None, code_section_offset, funcs: func_meta.into_boxed_slice(), }, } }