Initial vendor packages

Signed-off-by: Valentin Popov <valentin@popov.link>

1 files changed, 966 insertions, 0 deletions

diff --git a/vendor/object/src/read/wasm.rs b/vendor/object/src/read/wasm.rs
new file mode 100644
index 0000000..4d034bc
--- /dev/null
+++ b/vendor/object/src/read/wasm.rs
@@ -0,0 +1,966 @@
+//! Support for reading Wasm files.
+//!
+//! [`WasmFile`] implements the [`Object`] trait for Wasm files.
+use alloc::boxed::Box;
+use alloc::vec::Vec;
+use core::marker::PhantomData;
+use core::ops::Range;
+use core::{slice, str};
+use wasmparser as wp;
+
+use crate::read::{
+    self, Architecture, ComdatKind, CompressedData, CompressedFileRange, Error, Export, FileFlags,
+    Import, NoDynamicRelocationIterator, Object, ObjectComdat, ObjectKind, ObjectSection,
+    ObjectSegment, ObjectSymbol, ObjectSymbolTable, ReadError, ReadRef, Relocation, Result,
+    SectionFlags, SectionIndex, SectionKind, SegmentFlags, SymbolFlags, SymbolIndex, SymbolKind,
+    SymbolScope, SymbolSection,
+};
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[repr(usize)]
+enum SectionId {
+    Custom = 0,
+    Type = 1,
+    Import = 2,
+    Function = 3,
+    Table = 4,
+    Memory = 5,
+    Global = 6,
+    Export = 7,
+    Start = 8,
+    Element = 9,
+    Code = 10,
+    Data = 11,
+    DataCount = 12,
+}
+// Update this constant when adding new section id:
+const MAX_SECTION_ID: usize = SectionId::DataCount as usize;
+
+/// A WebAssembly object file.
+#[derive(Debug)]
+pub struct WasmFile<'data, R = &'data [u8]> {
+    data: &'data [u8],
+    has_memory64: bool,
+    // All sections, including custom sections.
+    sections: Vec<SectionHeader<'data>>,
+    // Indices into `sections` of sections with a non-zero id.
+    id_sections: Box<[Option<usize>; MAX_SECTION_ID + 1]>,
+    // Whether the file has DWARF information.
+    has_debug_symbols: bool,
+    // Symbols collected from imports, exports, code and name sections.
+    symbols: Vec<WasmSymbolInternal<'data>>,
+    // Address of the function body for the entry point.
+    entry: u64,
+    marker: PhantomData<R>,
+}
+
+#[derive(Debug)]
+struct SectionHeader<'data> {
+    id: SectionId,
+    range: Range<usize>,
+    name: &'data str,
+}
+
+#[derive(Clone)]
+enum LocalFunctionKind {
+    Unknown,
+    Exported { symbol_ids: Vec<u32> },
+    Local { symbol_id: u32 },
+}
+
+impl<T> ReadError<T> for wasmparser::Result<T> {
+    fn read_error(self, error: &'static str) -> Result<T> {
+        self.map_err(|_| Error(error))
+    }
+}
+
+impl<'data, R: ReadRef<'data>> WasmFile<'data, R> {
+    /// Parse the raw wasm data.
+    pub fn parse(data: R) -> Result<Self> {
+        let len = data.len().read_error("Unknown Wasm file size")?;
+        let data = data.read_bytes_at(0, len).read_error("Wasm read failed")?;
+        let parser = wp::Parser::new(0).parse_all(data);
+
+        let mut file = WasmFile {
+            data,
+            has_memory64: false,
+            sections: Vec::new(),
+            id_sections: Default::default(),
+            has_debug_symbols: false,
+            symbols: Vec::new(),
+            entry: 0,
+            marker: PhantomData,
+        };
+
+        let mut main_file_symbol = Some(WasmSymbolInternal {
+            name: "",
+            address: 0,
+            size: 0,
+            kind: SymbolKind::File,
+            section: SymbolSection::None,
+            scope: SymbolScope::Compilation,
+        });
+
+        let mut imported_funcs_count = 0;
+        let mut local_func_kinds = Vec::new();
+        let mut entry_func_id = None;
+        let mut code_range_start = 0;
+        let mut code_func_index = 0;
+        // One-to-one mapping of globals to their value (if the global is a constant integer).
+        let mut global_values = Vec::new();
+
+        for payload in parser {
+            let payload = payload.read_error("Invalid Wasm section header")?;
+
+            match payload {
+                wp::Payload::TypeSection(section) => {
+                    file.add_section(SectionId::Type, section.range(), "");
+                }
+                wp::Payload::ImportSection(section) => {
+                    file.add_section(SectionId::Import, section.range(), "");
+                    let mut last_module_name = None;
+
+                    for import in section {
+                        let import = import.read_error("Couldn't read an import item")?;
+                        let module_name = import.module;
+
+                        if last_module_name != Some(module_name) {
+                            file.symbols.push(WasmSymbolInternal {
+                                name: module_name,
+                                address: 0,
+                                size: 0,
+                                kind: SymbolKind::File,
+                                section: SymbolSection::None,
+                                scope: SymbolScope::Dynamic,
+                            });
+                            last_module_name = Some(module_name);
+                        }
+
+                        let kind = match import.ty {
+                            wp::TypeRef::Func(_) => {
+                                imported_funcs_count += 1;
+                                SymbolKind::Text
+                            }
+                            wp::TypeRef::Memory(memory) => {
+                                file.has_memory64 |= memory.memory64;
+                                SymbolKind::Data
+                            }
+                            wp::TypeRef::Table(_) | wp::TypeRef::Global(_) => SymbolKind::Data,
+                            wp::TypeRef::Tag(_) => SymbolKind::Unknown,
+                        };
+
+                        file.symbols.push(WasmSymbolInternal {
+                            name: import.name,
+                            address: 0,
+                            size: 0,
+                            kind,
+                            section: SymbolSection::Undefined,
+                            scope: SymbolScope::Dynamic,
+                        });
+                    }
+                }
+                wp::Payload::FunctionSection(section) => {
+                    file.add_section(SectionId::Function, section.range(), "");
+                    local_func_kinds =
+                        vec![LocalFunctionKind::Unknown; section.into_iter().count()];
+                }
+                wp::Payload::TableSection(section) => {
+                    file.add_section(SectionId::Table, section.range(), "");
+                }
+                wp::Payload::MemorySection(section) => {
+                    file.add_section(SectionId::Memory, section.range(), "");
+                    for memory in section {
+                        let memory = memory.read_error("Couldn't read a memory item")?;
+                        file.has_memory64 |= memory.memory64;
+                    }
+                }
+                wp::Payload::GlobalSection(section) => {
+                    file.add_section(SectionId::Global, section.range(), "");
+                    for global in section {
+                        let global = global.read_error("Couldn't read a global item")?;
+                        let mut address = None;
+                        if !global.ty.mutable {
+                            // There should be exactly one instruction.
+                            let init = global.init_expr.get_operators_reader().read();
+                            address = match init.read_error("Couldn't read a global init expr")? {
+                                wp::Operator::I32Const { value } => Some(value as u64),
+                                wp::Operator::I64Const { value } => Some(value as u64),
+                                _ => None,
+                            };
+                        }
+                        global_values.push(address);
+                    }
+                }
+                wp::Payload::ExportSection(section) => {
+                    file.add_section(SectionId::Export, section.range(), "");
+                    if let Some(main_file_symbol) = main_file_symbol.take() {
+                        file.symbols.push(main_file_symbol);
+                    }
+
+                    for export in section {
+                        let export = export.read_error("Couldn't read an export item")?;
+
+                        let (kind, section_idx) = match export.kind {
+                            wp::ExternalKind::Func => {
+                                if let Some(local_func_id) =
+                                    export.index.checked_sub(imported_funcs_count)
+                                {
+                                    let local_func_kind =
+                                        &mut local_func_kinds[local_func_id as usize];
+                                    if let LocalFunctionKind::Unknown = local_func_kind {
+                                        *local_func_kind = LocalFunctionKind::Exported {
+                                            symbol_ids: Vec::new(),
+                                        };
+                                    }
+                                    let symbol_ids = match local_func_kind {
+                                        LocalFunctionKind::Exported { symbol_ids } => symbol_ids,
+                                        _ => unreachable!(),
+                                    };
+                                    symbol_ids.push(file.symbols.len() as u32);
+                                }
+                                (SymbolKind::Text, SectionId::Code)
+                            }
+                            wp::ExternalKind::Table
+                            | wp::ExternalKind::Memory
+                            | wp::ExternalKind::Global => (SymbolKind::Data, SectionId::Data),
+                            // TODO
+                            wp::ExternalKind::Tag => continue,
+                        };
+
+                        // Try to guess the symbol address. Rust and C export a global containing
+                        // the address in linear memory of the symbol.
+                        let mut address = 0;
+                        if export.kind == wp::ExternalKind::Global {
+                            if let Some(&Some(x)) = global_values.get(export.index as usize) {
+                                address = x;
+                            }
+                        }
+
+                        file.symbols.push(WasmSymbolInternal {
+                            name: export.name,
+                            address,
+                            size: 0,
+                            kind,
+                            section: SymbolSection::Section(SectionIndex(section_idx as usize)),
+                            scope: SymbolScope::Dynamic,
+                        });
+                    }
+                }
+                wp::Payload::StartSection { func, range, .. } => {
+                    file.add_section(SectionId::Start, range, "");
+                    entry_func_id = Some(func);
+                }
+                wp::Payload::ElementSection(section) => {
+                    file.add_section(SectionId::Element, section.range(), "");
+                }
+                wp::Payload::CodeSectionStart { range, .. } => {
+                    code_range_start = range.start;
+                    file.add_section(SectionId::Code, range, "");
+                    if let Some(main_file_symbol) = main_file_symbol.take() {
+                        file.symbols.push(main_file_symbol);
+                    }
+                }
+                wp::Payload::CodeSectionEntry(body) => {
+                    let i = code_func_index;
+                    code_func_index += 1;
+
+                    let range = body.range();
+
+                    let address = range.start as u64 - code_range_start as u64;
+                    let size = (range.end - range.start) as u64;
+
+                    if entry_func_id == Some(i as u32) {
+                        file.entry = address;
+                    }
+
+                    let local_func_kind = &mut local_func_kinds[i];
+                    match local_func_kind {
+                        LocalFunctionKind::Unknown => {
+                            *local_func_kind = LocalFunctionKind::Local {
+                                symbol_id: file.symbols.len() as u32,
+                            };
+                            file.symbols.push(WasmSymbolInternal {
+                                name: "",
+                                address,
+                                size,
+                                kind: SymbolKind::Text,
+                                section: SymbolSection::Section(SectionIndex(
+                                    SectionId::Code as usize,
+                                )),
+                                scope: SymbolScope::Compilation,
+                            });
+                        }
+                        LocalFunctionKind::Exported { symbol_ids } => {
+                            for symbol_id in core::mem::take(symbol_ids) {
+                                let export_symbol = &mut file.symbols[symbol_id as usize];
+                                export_symbol.address = address;
+                                export_symbol.size = size;
+                            }
+                        }
+                        _ => unreachable!(),
+                    }
+                }
+                wp::Payload::DataSection(section) => {
+                    file.add_section(SectionId::Data, section.range(), "");
+                }
+                wp::Payload::DataCountSection { range, .. } => {
+                    file.add_section(SectionId::DataCount, range, "");
+                }
+                wp::Payload::CustomSection(section) => {
+                    let name = section.name();
+                    let size = section.data().len();
+                    let mut range = section.range();
+                    range.start = range.end - size;
+                    file.add_section(SectionId::Custom, range, name);
+                    if name == "name" {
+                        for name in
+                            wp::NameSectionReader::new(section.data(), section.data_offset())
+                        {
+                            // TODO: Right now, ill-formed name subsections
+                            // are silently ignored in order to maintain
+                            // compatibility with extended name sections, which
+                            // are not yet supported by the version of
+                            // `wasmparser` currently used.
+                            // A better fix would be to update `wasmparser` to
+                            // the newest version, but this requires
+                            // a major rewrite of this file.
+                            if let Ok(wp::Name::Function(name_map)) = name {
+                                for naming in name_map {
+                                    let naming =
+                                        naming.read_error("Couldn't read a function name")?;
+                                    if let Some(local_index) =
+                                        naming.index.checked_sub(imported_funcs_count)
+                                    {
+                                        if let LocalFunctionKind::Local { symbol_id } =
+                                            local_func_kinds[local_index as usize]
+                                        {
+                                            file.symbols[symbol_id as usize].name = naming.name;
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                    } else if name.starts_with(".debug_") {
+                        file.has_debug_symbols = true;
+                    }
+                }
+                _ => {}
+            }
+        }
+
+        Ok(file)
+    }
+
+    fn add_section(&mut self, id: SectionId, range: Range<usize>, name: &'data str) {
+        let section = SectionHeader { id, range, name };
+        self.id_sections[id as usize] = Some(self.sections.len());
+        self.sections.push(section);
+    }
+}
+
+impl<'data, R> read::private::Sealed for WasmFile<'data, R> {}
+
+impl<'data, 'file, R: ReadRef<'data>> Object<'data, 'file> for WasmFile<'data, R>
+where
+    'data: 'file,
+    R: 'file,
+{
+    type Segment = WasmSegment<'data, 'file, R>;
+    type SegmentIterator = WasmSegmentIterator<'data, 'file, R>;
+    type Section = WasmSection<'data, 'file, R>;
+    type SectionIterator = WasmSectionIterator<'data, 'file, R>;
+    type Comdat = WasmComdat<'data, 'file, R>;
+    type ComdatIterator = WasmComdatIterator<'data, 'file, R>;
+    type Symbol = WasmSymbol<'data, 'file>;
+    type SymbolIterator = WasmSymbolIterator<'data, 'file>;
+    type SymbolTable = WasmSymbolTable<'data, 'file>;
+    type DynamicRelocationIterator = NoDynamicRelocationIterator;
+
+    #[inline]
+    fn architecture(&self) -> Architecture {
+        if self.has_memory64 {
+            Architecture::Wasm64
+        } else {
+            Architecture::Wasm32
+        }
+    }
+
+    #[inline]
+    fn is_little_endian(&self) -> bool {
+        true
+    }
+
+    #[inline]
+    fn is_64(&self) -> bool {
+        self.has_memory64
+    }
+
+    fn kind(&self) -> ObjectKind {
+        // TODO: check for `linking` custom section
+        ObjectKind::Unknown
+    }
+
+    fn segments(&'file self) -> Self::SegmentIterator {
+        WasmSegmentIterator { file: self }
+    }
+
+    fn section_by_name_bytes(
+        &'file self,
+        section_name: &[u8],
+    ) -> Option<WasmSection<'data, 'file, R>> {
+        self.sections()
+            .find(|section| section.name_bytes() == Ok(section_name))
+    }
+
+    fn section_by_index(&'file self, index: SectionIndex) -> Result<WasmSection<'data, 'file, R>> {
+        // TODO: Missing sections should return an empty section.
+        let id_section = self
+            .id_sections
+            .get(index.0)
+            .and_then(|x| *x)
+            .read_error("Invalid Wasm section index")?;
+        let section = self.sections.get(id_section).unwrap();
+        Ok(WasmSection {
+            file: self,
+            section,
+        })
+    }
+
+    fn sections(&'file self) -> Self::SectionIterator {
+        WasmSectionIterator {
+            file: self,
+            sections: self.sections.iter(),
+        }
+    }
+
+    fn comdats(&'file self) -> Self::ComdatIterator {
+        WasmComdatIterator { file: self }
+    }
+
+    #[inline]
+    fn symbol_by_index(&'file self, index: SymbolIndex) -> Result<WasmSymbol<'data, 'file>> {
+        let symbol = self
+            .symbols
+            .get(index.0)
+            .read_error("Invalid Wasm symbol index")?;
+        Ok(WasmSymbol { index, symbol })
+    }
+
+    fn symbols(&'file self) -> Self::SymbolIterator {
+        WasmSymbolIterator {
+            symbols: self.symbols.iter().enumerate(),
+        }
+    }
+
+    fn symbol_table(&'file self) -> Option<WasmSymbolTable<'data, 'file>> {
+        Some(WasmSymbolTable {
+            symbols: &self.symbols,
+        })
+    }
+
+    fn dynamic_symbols(&'file self) -> Self::SymbolIterator {
+        WasmSymbolIterator {
+            symbols: [].iter().enumerate(),
+        }
+    }
+
+    #[inline]
+    fn dynamic_symbol_table(&'file self) -> Option<WasmSymbolTable<'data, 'file>> {
+        None
+    }
+
+    #[inline]
+    fn dynamic_relocations(&self) -> Option<NoDynamicRelocationIterator> {
+        None
+    }
+
+    fn imports(&self) -> Result<Vec<Import<'data>>> {
+        // TODO: return entries in the import section
+        Ok(Vec::new())
+    }
+
+    fn exports(&self) -> Result<Vec<Export<'data>>> {
+        // TODO: return entries in the export section
+        Ok(Vec::new())
+    }
+
+    fn has_debug_symbols(&self) -> bool {
+        self.has_debug_symbols
+    }
+
+    fn relative_address_base(&self) -> u64 {
+        0
+    }
+
+    #[inline]
+    fn entry(&'file self) -> u64 {
+        self.entry
+    }
+
+    #[inline]
+    fn flags(&self) -> FileFlags {
+        FileFlags::None
+    }
+}
+
+/// An iterator for the segments in a [`WasmFile`].
+///
+/// This is a stub that doesn't implement any functionality.
+#[derive(Debug)]
+pub struct WasmSegmentIterator<'data, 'file, R = &'data [u8]> {
+    #[allow(unused)]
+    file: &'file WasmFile<'data, R>,
+}
+
+impl<'data, 'file, R> Iterator for WasmSegmentIterator<'data, 'file, R> {
+    type Item = WasmSegment<'data, 'file, R>;
+
+    #[inline]
+    fn next(&mut self) -> Option<Self::Item> {
+        None
+    }
+}
+
+/// A segment in a [`WasmFile`].
+///
+/// This is a stub that doesn't implement any functionality.
+#[derive(Debug)]
+pub struct WasmSegment<'data, 'file, R = &'data [u8]> {
+    #[allow(unused)]
+    file: &'file WasmFile<'data, R>,
+}
+
+impl<'data, 'file, R> read::private::Sealed for WasmSegment<'data, 'file, R> {}
+
+impl<'data, 'file, R> ObjectSegment<'data> for WasmSegment<'data, 'file, R> {
+    #[inline]
+    fn address(&self) -> u64 {
+        unreachable!()
+    }
+
+    #[inline]
+    fn size(&self) -> u64 {
+        unreachable!()
+    }
+
+    #[inline]
+    fn align(&self) -> u64 {
+        unreachable!()
+    }
+
+    #[inline]
+    fn file_range(&self) -> (u64, u64) {
+        unreachable!()
+    }
+
+    fn data(&self) -> Result<&'data [u8]> {
+        unreachable!()
+    }
+
+    fn data_range(&self, _address: u64, _size: u64) -> Result<Option<&'data [u8]>> {
+        unreachable!()
+    }
+
+    #[inline]
+    fn name_bytes(&self) -> Result<Option<&[u8]>> {
+        unreachable!()
+    }
+
+    #[inline]
+    fn name(&self) -> Result<Option<&str>> {
+        unreachable!()
+    }
+
+    #[inline]
+    fn flags(&self) -> SegmentFlags {
+        unreachable!()
+    }
+}
+
+/// An iterator for the sections in a [`WasmFile`].
+#[derive(Debug)]
+pub struct WasmSectionIterator<'data, 'file, R = &'data [u8]> {
+    file: &'file WasmFile<'data, R>,
+    sections: slice::Iter<'file, SectionHeader<'data>>,
+}
+
+impl<'data, 'file, R> Iterator for WasmSectionIterator<'data, 'file, R> {
+    type Item = WasmSection<'data, 'file, R>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        let section = self.sections.next()?;
+        Some(WasmSection {
+            file: self.file,
+            section,
+        })
+    }
+}
+
+/// A section in a [`WasmFile`].
+///
+/// Most functionality is provided by the [`ObjectSection`] trait implementation.
+#[derive(Debug)]
+pub struct WasmSection<'data, 'file, R = &'data [u8]> {
+    file: &'file WasmFile<'data, R>,
+    section: &'file SectionHeader<'data>,
+}
+
+impl<'data, 'file, R> read::private::Sealed for WasmSection<'data, 'file, R> {}
+
+impl<'data, 'file, R: ReadRef<'data>> ObjectSection<'data> for WasmSection<'data, 'file, R> {
+    type RelocationIterator = WasmRelocationIterator<'data, 'file, R>;
+
+    #[inline]
+    fn index(&self) -> SectionIndex {
+        // Note that we treat all custom sections as index 0.
+        // This is ok because they are never looked up by index.
+        SectionIndex(self.section.id as usize)
+    }
+
+    #[inline]
+    fn address(&self) -> u64 {
+        0
+    }
+
+    #[inline]
+    fn size(&self) -> u64 {
+        let range = &self.section.range;
+        (range.end - range.start) as u64
+    }
+
+    #[inline]
+    fn align(&self) -> u64 {
+        1
+    }
+
+    #[inline]
+    fn file_range(&self) -> Option<(u64, u64)> {
+        let range = &self.section.range;
+        Some((range.start as _, range.end as _))
+    }
+
+    #[inline]
+    fn data(&self) -> Result<&'data [u8]> {
+        let range = &self.section.range;
+        self.file
+            .data
+            .read_bytes_at(range.start as u64, range.end as u64 - range.start as u64)
+            .read_error("Invalid Wasm section size or offset")
+    }
+
+    fn data_range(&self, _address: u64, _size: u64) -> Result<Option<&'data [u8]>> {
+        unimplemented!()
+    }
+
+    #[inline]
+    fn compressed_file_range(&self) -> Result<CompressedFileRange> {
+        Ok(CompressedFileRange::none(self.file_range()))
+    }
+
+    #[inline]
+    fn compressed_data(&self) -> Result<CompressedData<'data>> {
+        self.data().map(CompressedData::none)
+    }
+
+    #[inline]
+    fn name_bytes(&self) -> Result<&[u8]> {
+        self.name().map(str::as_bytes)
+    }
+
+    #[inline]
+    fn name(&self) -> Result<&str> {
+        Ok(match self.section.id {
+            SectionId::Custom => self.section.name,
+            SectionId::Type => "<type>",
+            SectionId::Import => "<import>",
+            SectionId::Function => "<function>",
+            SectionId::Table => "<table>",
+            SectionId::Memory => "<memory>",
+            SectionId::Global => "<global>",
+            SectionId::Export => "<export>",
+            SectionId::Start => "<start>",
+            SectionId::Element => "<element>",
+            SectionId::Code => "<code>",
+            SectionId::Data => "<data>",
+            SectionId::DataCount => "<data_count>",
+        })
+    }
+
+    #[inline]
+    fn segment_name_bytes(&self) -> Result<Option<&[u8]>> {
+        Ok(None)
+    }
+
+    #[inline]
+    fn segment_name(&self) -> Result<Option<&str>> {
+        Ok(None)
+    }
+
+    #[inline]
+    fn kind(&self) -> SectionKind {
+        match self.section.id {
+            SectionId::Custom => match self.section.name {
+                "reloc." | "linking" => SectionKind::Linker,
+                _ => SectionKind::Other,
+            },
+            SectionId::Type => SectionKind::Metadata,
+            SectionId::Import => SectionKind::Linker,
+            SectionId::Function => SectionKind::Metadata,
+            SectionId::Table => SectionKind::UninitializedData,
+            SectionId::Memory => SectionKind::UninitializedData,
+            SectionId::Global => SectionKind::Data,
+            SectionId::Export => SectionKind::Linker,
+            SectionId::Start => SectionKind::Linker,
+            SectionId::Element => SectionKind::Data,
+            SectionId::Code => SectionKind::Text,
+            SectionId::Data => SectionKind::Data,
+            SectionId::DataCount => SectionKind::UninitializedData,
+        }
+    }
+
+    #[inline]
+    fn relocations(&self) -> WasmRelocationIterator<'data, 'file, R> {
+        WasmRelocationIterator(PhantomData)
+    }
+
+    #[inline]
+    fn flags(&self) -> SectionFlags {
+        SectionFlags::None
+    }
+}
+
+/// An iterator for the COMDAT section groups in a [`WasmFile`].
+///
+/// This is a stub that doesn't implement any functionality.
+#[derive(Debug)]
+pub struct WasmComdatIterator<'data, 'file, R = &'data [u8]> {
+    #[allow(unused)]
+    file: &'file WasmFile<'data, R>,
+}
+
+impl<'data, 'file, R> Iterator for WasmComdatIterator<'data, 'file, R> {
+    type Item = WasmComdat<'data, 'file, R>;
+
+    #[inline]
+    fn next(&mut self) -> Option<Self::Item> {
+        None
+    }
+}
+
+/// A COMDAT section group in a [`WasmFile`].
+///
+/// This is a stub that doesn't implement any functionality.
+#[derive(Debug)]
+pub struct WasmComdat<'data, 'file, R = &'data [u8]> {
+    #[allow(unused)]
+    file: &'file WasmFile<'data, R>,
+}
+
+impl<'data, 'file, R> read::private::Sealed for WasmComdat<'data, 'file, R> {}
+
+impl<'data, 'file, R> ObjectComdat<'data> for WasmComdat<'data, 'file, R> {
+    type SectionIterator = WasmComdatSectionIterator<'data, 'file, R>;
+
+    #[inline]
+    fn kind(&self) -> ComdatKind {
+        unreachable!();
+    }
+
+    #[inline]
+    fn symbol(&self) -> SymbolIndex {
+        unreachable!();
+    }
+
+    #[inline]
+    fn name_bytes(&self) -> Result<&[u8]> {
+        unreachable!();
+    }
+
+    #[inline]
+    fn name(&self) -> Result<&str> {
+        unreachable!();
+    }
+
+    #[inline]
+    fn sections(&self) -> Self::SectionIterator {
+        unreachable!();
+    }
+}
+
+/// An iterator for the sections in a COMDAT section group in a [`WasmFile`].
+///
+/// This is a stub that doesn't implement any functionality.
+#[derive(Debug)]
+pub struct WasmComdatSectionIterator<'data, 'file, R = &'data [u8]> {
+    #[allow(unused)]
+    file: &'file WasmFile<'data, R>,
+}
+
+impl<'data, 'file, R> Iterator for WasmComdatSectionIterator<'data, 'file, R> {
+    type Item = SectionIndex;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        None
+    }
+}
+
+/// A symbol table in a [`WasmFile`].
+#[derive(Debug)]
+pub struct WasmSymbolTable<'data, 'file> {
+    symbols: &'file [WasmSymbolInternal<'data>],
+}
+
+impl<'data, 'file> read::private::Sealed for WasmSymbolTable<'data, 'file> {}
+
+impl<'data, 'file> ObjectSymbolTable<'data> for WasmSymbolTable<'data, 'file> {
+    type Symbol = WasmSymbol<'data, 'file>;
+    type SymbolIterator = WasmSymbolIterator<'data, 'file>;
+
+    fn symbols(&self) -> Self::SymbolIterator {
+        WasmSymbolIterator {
+            symbols: self.symbols.iter().enumerate(),
+        }
+    }
+
+    fn symbol_by_index(&self, index: SymbolIndex) -> Result<Self::Symbol> {
+        let symbol = self
+            .symbols
+            .get(index.0)
+            .read_error("Invalid Wasm symbol index")?;
+        Ok(WasmSymbol { index, symbol })
+    }
+}
+
+/// An iterator for the symbols in a [`WasmFile`].
+#[derive(Debug)]
+pub struct WasmSymbolIterator<'data, 'file> {
+    symbols: core::iter::Enumerate<slice::Iter<'file, WasmSymbolInternal<'data>>>,
+}
+
+impl<'data, 'file> Iterator for WasmSymbolIterator<'data, 'file> {
+    type Item = WasmSymbol<'data, 'file>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        let (index, symbol) = self.symbols.next()?;
+        Some(WasmSymbol {
+            index: SymbolIndex(index),
+            symbol,
+        })
+    }
+}
+
+/// A symbol in a [`WasmFile`].
+///
+/// Most functionality is provided by the [`ObjectSymbol`] trait implementation.
+#[derive(Clone, Copy, Debug)]
+pub struct WasmSymbol<'data, 'file> {
+    index: SymbolIndex,
+    symbol: &'file WasmSymbolInternal<'data>,
+}
+
+#[derive(Clone, Debug)]
+struct WasmSymbolInternal<'data> {
+    name: &'data str,
+    address: u64,
+    size: u64,
+    kind: SymbolKind,
+    section: SymbolSection,
+    scope: SymbolScope,
+}
+
+impl<'data, 'file> read::private::Sealed for WasmSymbol<'data, 'file> {}
+
+impl<'data, 'file> ObjectSymbol<'data> for WasmSymbol<'data, 'file> {
+    #[inline]
+    fn index(&self) -> SymbolIndex {
+        self.index
+    }
+
+    #[inline]
+    fn name_bytes(&self) -> read::Result<&'data [u8]> {
+        Ok(self.symbol.name.as_bytes())
+    }
+
+    #[inline]
+    fn name(&self) -> read::Result<&'data str> {
+        Ok(self.symbol.name)
+    }
+
+    #[inline]
+    fn address(&self) -> u64 {
+        self.symbol.address
+    }
+
+    #[inline]
+    fn size(&self) -> u64 {
+        self.symbol.size
+    }
+
+    #[inline]
+    fn kind(&self) -> SymbolKind {
+        self.symbol.kind
+    }
+
+    #[inline]
+    fn section(&self) -> SymbolSection {
+        self.symbol.section
+    }
+
+    #[inline]
+    fn is_undefined(&self) -> bool {
+        self.symbol.section == SymbolSection::Undefined
+    }
+
+    #[inline]
+    fn is_definition(&self) -> bool {
+        (self.symbol.kind == SymbolKind::Text || self.symbol.kind == SymbolKind::Data)
+            && self.symbol.section != SymbolSection::Undefined
+    }
+
+    #[inline]
+    fn is_common(&self) -> bool {
+        self.symbol.section == SymbolSection::Common
+    }
+
+    #[inline]
+    fn is_weak(&self) -> bool {
+        false
+    }
+
+    #[inline]
+    fn scope(&self) -> SymbolScope {
+        self.symbol.scope
+    }
+
+    #[inline]
+    fn is_global(&self) -> bool {
+        self.symbol.scope != SymbolScope::Compilation
+    }
+
+    #[inline]
+    fn is_local(&self) -> bool {
+        self.symbol.scope == SymbolScope::Compilation
+    }
+
+    #[inline]
+    fn flags(&self) -> SymbolFlags<SectionIndex, SymbolIndex> {
+        SymbolFlags::None
+    }
+}
+
+/// An iterator for the relocations for a [`WasmSection`].
+///
+/// This is a stub that doesn't implement any functionality.
+#[derive(Debug)]
+pub struct WasmRelocationIterator<'data, 'file, R = &'data [u8]>(
+    PhantomData<(&'data (), &'file (), R)>,
+);
+
+impl<'data, 'file, R> Iterator for WasmRelocationIterator<'data, 'file, R> {
+    type Item = (u64, Relocation);
+
+    #[inline]
+    fn next(&mut self) -> Option<Self::Item> {
+        None
+    }
+}