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2811: Added some infrastructure to generate EH_Frame in singlepass compiler r=Amanieu a=ptitSeb # Description Add generation of EH_Frame in singlepass compiler, to allow correct backtrace in case of trap. Co-authored-by: ptitSeb <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,102 @@ | ||
| use gimli::write::{Address, EndianVec, Result, Writer}; | ||
| use gimli::{RunTimeEndian, SectionId}; | ||
| use wasmer_compiler::{CustomSection, CustomSectionProtection, SectionBody}; | ||
| use wasmer_compiler::{Endianness, Relocation, RelocationKind, RelocationTarget}; | ||
| use wasmer_types::entity::EntityRef; | ||
| use wasmer_types::LocalFunctionIndex; | ||
|
|
||
| #[derive(Clone, Debug)] | ||
| pub struct WriterRelocate { | ||
| pub relocs: Vec<Relocation>, | ||
| writer: EndianVec<RunTimeEndian>, | ||
| } | ||
|
|
||
| impl WriterRelocate { | ||
| pub const FUNCTION_SYMBOL: usize = 0; | ||
| pub fn new(endianness: Option<Endianness>) -> Self { | ||
| let endianness = match endianness { | ||
| Some(Endianness::Little) => RunTimeEndian::Little, | ||
| Some(Endianness::Big) => RunTimeEndian::Big, | ||
| // We autodetect it, based on the host | ||
| None => RunTimeEndian::default(), | ||
| }; | ||
| WriterRelocate { | ||
| relocs: Vec::new(), | ||
| writer: EndianVec::new(endianness), | ||
| } | ||
| } | ||
|
|
||
| pub fn into_section(mut self) -> CustomSection { | ||
| // GCC expects a terminating "empty" length, so write a 0 length at the end of the table. | ||
| self.writer.write_u32(0).unwrap(); | ||
| let data = self.writer.into_vec(); | ||
| CustomSection { | ||
| protection: CustomSectionProtection::Read, | ||
| bytes: SectionBody::new_with_vec(data), | ||
| relocations: self.relocs, | ||
| } | ||
| } | ||
| } | ||
|
|
||
| impl Writer for WriterRelocate { | ||
| 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 } => { | ||
| // Is a function relocation | ||
| if symbol == Self::FUNCTION_SYMBOL { | ||
| // We use the addend to detect the function index | ||
| let function_index = LocalFunctionIndex::new(addend as _); | ||
| let reloc_target = RelocationTarget::LocalFunc(function_index); | ||
| let offset = self.len() as u32; | ||
| let kind = match size { | ||
| 8 => RelocationKind::Abs8, | ||
| _ => unimplemented!("dwarf relocation size not yet supported: {}", size), | ||
| }; | ||
| let addend = 0; | ||
| self.relocs.push(Relocation { | ||
| kind, | ||
| reloc_target, | ||
| offset, | ||
| addend, | ||
| }); | ||
| self.write_udata(addend as u64, size) | ||
| } else { | ||
| unreachable!("Symbol {} in DWARF not recognized", symbol); | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| fn write_offset(&mut self, _val: usize, _section: SectionId, _size: u8) -> Result<()> { | ||
| unimplemented!("write_offset not yet implemented"); | ||
| } | ||
|
|
||
| fn write_offset_at( | ||
| &mut self, | ||
| _offset: usize, | ||
| _val: usize, | ||
| _section: SectionId, | ||
| _size: u8, | ||
| ) -> Result<()> { | ||
| unimplemented!("write_offset_at not yet implemented"); | ||
| } | ||
| } |
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