src/metadata.rs

   1 use crate::rustc::middle::cstore::MetadataLoader;
   2 use crate::rustc_data_structures::owning_ref::{self, OwningRef};
   3 use std::fs::File;
   4 use std::path::Path;
   5
   6 pub struct CraneliftMetadataLoader;
   7
   8 impl MetadataLoader for CraneliftMetadataLoader {
   9     fn get_rlib_metadata(
  10         &self,
  11         _target: &crate::rustc_target::spec::Target,
  12         path: &Path,
  13     ) -> Result<owning_ref::ErasedBoxRef<[u8]>, String> {
  14         let mut archive = ar::Archive::new(File::open(path).map_err(|e| format!("{:?}", e))?);
  15         // Iterate over all entries in the archive:
  16         while let Some(entry_result) = archive.next_entry() {
  17             let mut entry = entry_result.map_err(|e| format!("{:?}", e))?;
  18             if entry
  19                 .header()
  20                 .identifier()
  21                 .starts_with(b".rustc.clif_metadata")
  22             {
  23                 let mut buf = Vec::new();
  24                 ::std::io::copy(&mut entry, &mut buf).map_err(|e| format!("{:?}", e))?;
  25                 let buf: OwningRef<Vec<u8>, [u8]> = OwningRef::new(buf).into();
  26                 return Ok(rustc_erase_owner!(buf.map_owner_box()));
  27             }
  28         }
  29
  30         Err("couldn't find metadata entry".to_string())
  31         //self.get_dylib_metadata(target, path)
  32     }
  33
  34     fn get_dylib_metadata(
  35         &self,
  36         _target: &crate::rustc_target::spec::Target,
  37         _path: &Path,
  38     ) -> Result<owning_ref::ErasedBoxRef<[u8]>, String> {
  39         Err("dylib metadata loading is not yet supported".to_string())
  40     }
  41 }