New upstream version 1.54.0+dfsg1

[rustc.git] / compiler / rustc_codegen_cranelift / src / metadata.rs

diff --git a/compiler/rustc_codegen_cranelift/src/metadata.rs b/compiler/rustc_codegen_cranelift/src/metadata.rs
index dbdc8cbad44c45aea7ad1c22e410aac69945f16d..db24bf65eb5a2e015620822b67b81592feeff024 100644 (file)
--- a/compiler/rustc_codegen_cranelift/src/metadata.rs
+++ b/compiler/rustc_codegen_cranelift/src/metadata.rs
@@ -1,111 +1,20 @@
-//! Reading and writing of the rustc metadata for rlibs and dylibs
+//! Writing of the rustc metadata for dylibs
 
-use std::fs::File;
-use std::path::Path;
-
-use rustc_codegen_ssa::METADATA_FILENAME;
-use rustc_data_structures::memmap::Mmap;
-use rustc_data_structures::owning_ref::OwningRef;
-use rustc_data_structures::rustc_erase_owner;
-use rustc_data_structures::sync::MetadataRef;
-use rustc_middle::middle::cstore::{EncodedMetadata, MetadataLoader};
 use rustc_middle::ty::TyCtxt;
-use rustc_session::config;
-use rustc_target::spec::Target;
 
 use crate::backend::WriteMetadata;
 
-pub(crate) struct CraneliftMetadataLoader;
-
-fn load_metadata_with(
-    path: &Path,
-    f: impl for<'a> FnOnce(&'a [u8]) -> Result<&'a [u8], String>,
-) -> Result<MetadataRef, String> {
-    let file = File::open(path).map_err(|e| format!("{:?}", e))?;
-    let data = unsafe { Mmap::map(file) }.map_err(|e| format!("{:?}", e))?;
-    let metadata = OwningRef::new(data).try_map(f)?;
-    return Ok(rustc_erase_owner!(metadata.map_owner_box()));
-}
-
-impl MetadataLoader for CraneliftMetadataLoader {
-    fn get_rlib_metadata(&self, _target: &Target, path: &Path) -> Result<MetadataRef, String> {
-        load_metadata_with(path, |data| {
-            let archive = object::read::archive::ArchiveFile::parse(&*data)
-                .map_err(|e| format!("{:?}", e))?;
-
-            for entry_result in archive.members() {
-                let entry = entry_result.map_err(|e| format!("{:?}", e))?;
-                if entry.name() == METADATA_FILENAME.as_bytes() {
-                    return Ok(entry.data());
-                }
-            }
-
-            Err("couldn't find metadata entry".to_string())
-        })
-    }
-
-    fn get_dylib_metadata(&self, _target: &Target, path: &Path) -> Result<MetadataRef, String> {
-        use object::{Object, ObjectSection};
-
-        load_metadata_with(path, |data| {
-            let file = object::File::parse(&data).map_err(|e| format!("parse: {:?}", e))?;
-            file.section_by_name(".rustc")
-                .ok_or("no .rustc section")?
-                .data()
-                .map_err(|e| format!("failed to read .rustc section: {:?}", e))
-        })
-    }
-}
-
 // Adapted from https://github.com/rust-lang/rust/blob/da573206f87b5510de4b0ee1a9c044127e409bd3/src/librustc_codegen_llvm/base.rs#L47-L112
-pub(crate) fn write_metadata<P: WriteMetadata>(
-    tcx: TyCtxt<'_>,
-    product: &mut P,
-) -> EncodedMetadata {
+pub(crate) fn write_metadata<O: WriteMetadata>(tcx: TyCtxt<'_>, object: &mut O) {
     use snap::write::FrameEncoder;
     use std::io::Write;
 
-    #[derive(PartialEq, Eq, PartialOrd, Ord)]
-    enum MetadataKind {
-        None,
-        Uncompressed,
-        Compressed,
-    }
-
-    let kind = tcx
-        .sess
-        .crate_types()
-        .iter()
-        .map(|ty| match *ty {
-            config::CrateType::Executable
-            | config::CrateType::Staticlib
-            | config::CrateType::Cdylib => MetadataKind::None,
-
-            config::CrateType::Rlib => MetadataKind::Uncompressed,
-
-            config::CrateType::Dylib | config::CrateType::ProcMacro => MetadataKind::Compressed,
-        })
-        .max()
-        .unwrap_or(MetadataKind::None);
-
-    if kind == MetadataKind::None {
-        return EncodedMetadata::new();
-    }
-
     let metadata = tcx.encode_metadata();
-    if kind == MetadataKind::Uncompressed {
-        return metadata;
-    }
-
-    assert!(kind == MetadataKind::Compressed);
-    let mut compressed = tcx.metadata_encoding_version();
+    let mut compressed = rustc_metadata::METADATA_HEADER.to_vec();
     FrameEncoder::new(&mut compressed).write_all(&metadata.raw_data).unwrap();
 
-    product.add_rustc_section(
+    object.add_rustc_section(
         rustc_middle::middle::exported_symbols::metadata_symbol_name(tcx),
         compressed,
-        tcx.sess.target.is_like_osx,
     );
-
-    metadata
 }