src/metadata.rs

   1 //! Writing of the rustc metadata for dylibs
   2
   3 use rustc_middle::ty::TyCtxt;
   4
   5 use crate::backend::WriteMetadata;
   6
   7 // Adapted from https://github.com/rust-lang/rust/blob/da573206f87b5510de4b0ee1a9c044127e409bd3/src/librustc_codegen_llvm/base.rs#L47-L112
   8 pub(crate) fn write_metadata<O: WriteMetadata>(tcx: TyCtxt<'_>, object: &mut O) {
   9     use snap::write::FrameEncoder;
  10     use std::io::Write;
  11
  12     let metadata = tcx.encode_metadata();
  13     let mut compressed = rustc_metadata::METADATA_HEADER.to_vec();
  14     FrameEncoder::new(&mut compressed).write_all(&metadata.raw_data).unwrap();
  15
  16     object.add_rustc_section(
  17         rustc_middle::middle::exported_symbols::metadata_symbol_name(tcx),
  18         compressed,
  19     );
  20 }