4 use rustc::middle::cstore::{EncodedMetadata, MetadataLoader};
5 use rustc::session::config;
7 use rustc_codegen_ssa::METADATA_FILENAME;
8 use rustc_data_structures::owning_ref::{self, OwningRef};
9 use rustc_data_structures::rustc_erase_owner;
10 use rustc_target::spec::Target;
12 use crate::backend::Product;
14 pub struct CraneliftMetadataLoader;
16 impl MetadataLoader for CraneliftMetadataLoader {
21 ) -> Result<owning_ref::ErasedBoxRef<[u8]>, String> {
22 let mut archive = ar::Archive::new(File::open(path).map_err(|e| format!("{:?}", e))?);
23 // Iterate over all entries in the archive:
24 while let Some(entry_result) = archive.next_entry() {
25 let mut entry = entry_result.map_err(|e| format!("{:?}", e))?;
26 if entry.header().identifier() == METADATA_FILENAME.as_bytes() {
27 let mut buf = Vec::new();
28 ::std::io::copy(&mut entry, &mut buf).map_err(|e| format!("{:?}", e))?;
29 let buf: OwningRef<Vec<u8>, [u8]> = OwningRef::new(buf).into();
30 return Ok(rustc_erase_owner!(buf.map_owner_box()));
34 Err("couldn't find metadata entry".to_string())
35 //self.get_dylib_metadata(target, path)
38 fn get_dylib_metadata(
42 ) -> Result<owning_ref::ErasedBoxRef<[u8]>, String> {
44 let file = std::fs::read(path).map_err(|e| format!("read:{:?}", e))?;
45 let file = object::File::parse(&file).map_err(|e| format!("parse: {:?}", e))?;
47 .section_data_by_name(".rustc")
48 .ok_or("no .rustc section")?
50 let buf: OwningRef<Vec<u8>, [u8]> = OwningRef::new(buf).into();
51 Ok(rustc_erase_owner!(buf.map_owner_box()))
55 // Adapted from https://github.com/rust-lang/rust/blob/da573206f87b5510de4b0ee1a9c044127e409bd3/src/librustc_codegen_llvm/base.rs#L47-L112
56 pub fn write_metadata<P: Product>(tcx: TyCtxt<'_>, product: &mut P) -> EncodedMetadata {
57 use flate2::write::DeflateEncoder;
58 use flate2::Compression;
61 #[derive(PartialEq, Eq, PartialOrd, Ord)]
74 config::CrateType::Executable
75 | config::CrateType::Staticlib
76 | config::CrateType::Cdylib => MetadataKind::None,
78 config::CrateType::Rlib => MetadataKind::Uncompressed,
80 config::CrateType::Dylib | config::CrateType::ProcMacro => MetadataKind::Compressed,
83 .unwrap_or(MetadataKind::None);
85 if kind == MetadataKind::None {
86 return EncodedMetadata::new();
89 let metadata = tcx.encode_metadata();
90 if kind == MetadataKind::Uncompressed {
94 assert!(kind == MetadataKind::Compressed);
95 let mut compressed = tcx.metadata_encoding_version();
96 DeflateEncoder::new(&mut compressed, Compression::fast())
97 .write_all(&metadata.raw_data)
100 product.add_rustc_section(
101 rustc::middle::exported_symbols::metadata_symbol_name(tcx),
103 tcx.sess.target.target.options.is_like_osx,