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use faerie::artifact::{Decl, SectionKind}; use faerie::*; use gimli::write::{Address, Dwarf, EndianVec, Result, Sections, Writer}; use gimli::{RunTimeEndian, SectionId}; #[derive(Clone)] struct DebugReloc { offset: u32, size: u8, name: String, addend: i64, } pub enum ResolvedSymbol { PhysicalAddress(u64), Reloc { name: String, addend: i64 }, } pub trait SymbolResolver { fn resolve_symbol(&self, symbol: usize, addend: i64) -> ResolvedSymbol; } pub fn emit_dwarf( artifact: &mut Artifact, mut dwarf: Dwarf, symbol_resolver: &dyn SymbolResolver, ) -> anyhow::Result<()> { let endian = RunTimeEndian::Little; let mut sections = Sections::new(WriterRelocate::new(endian, symbol_resolver)); dwarf.write(&mut sections)?; sections.for_each_mut(|id, s| -> anyhow::Result<()> { artifact.declare_with( id.name(), Decl::section(SectionKind::Debug), s.writer.take(), ) })?; sections.for_each_mut(|id, s| -> anyhow::Result<()> { for reloc in &s.relocs { artifact.link_with( faerie::Link { from: id.name(), to: &reloc.name, at: u64::from(reloc.offset), }, faerie::Reloc::Debug { size: reloc.size, addend: reloc.addend as i32, }, )?; } Ok(()) })?; Ok(()) } #[derive(Clone)] pub struct WriterRelocate<'a> { relocs: Vec<DebugReloc>, writer: EndianVec<RunTimeEndian>, symbol_resolver: &'a dyn SymbolResolver, } impl<'a> WriterRelocate<'a> { pub fn new(endian: RunTimeEndian, symbol_resolver: &'a dyn SymbolResolver) -> Self { WriterRelocate { relocs: Vec::new(), writer: EndianVec::new(endian), symbol_resolver, } } } impl<'a> Writer for WriterRelocate<'a> { type Endian = RunTimeEndian; fn endian(&self) -> Self::Endian { self.writer.endian() } fn len(&self) -> usize { self.writer.len() } fn write(&mut self, bytes: &[u8]) -> Result<()> { self.writer.write(bytes) } fn write_at(&mut self, offset: usize, bytes: &[u8]) -> Result<()> { self.writer.write_at(offset, bytes) } fn write_address(&mut self, address: Address, size: u8) -> Result<()> { match address { Address::Constant(val) => self.write_udata(val, size), Address::Symbol { symbol, addend } => { match self.symbol_resolver.resolve_symbol(symbol, addend as i64) { ResolvedSymbol::PhysicalAddress(addr) => self.write_udata(addr, size), ResolvedSymbol::Reloc { name, addend } => { let offset = self.len() as u64; self.relocs.push(DebugReloc { offset: offset as u32, size, name, addend, }); self.write_udata(addend as u64, size) } } } } } fn write_offset(&mut self, val: usize, section: SectionId, size: u8) -> Result<()> { let offset = self.len() as u32; let name = section.name().to_string(); self.relocs.push(DebugReloc { offset, size, name, addend: val as i64, }); self.write_udata(val as u64, size) } fn write_offset_at( &mut self, offset: usize, val: usize, section: SectionId, size: u8, ) -> Result<()> { let name = section.name().to_string(); self.relocs.push(DebugReloc { offset: offset as u32, size, name, addend: val as i64, }); self.write_udata_at(offset, val as u64, size) } }