Rollup merge of rust-lang#99844 - bjorn3:archive_builder_interface_re…

…factor, r=nagisa

Introduce an ArchiveBuilderBuilder

This avoids monomorphizing all linker code for each codegen backend and will allow passing in extra information to the archive builder from the codegen backend. I'm going to use this in rust-lang#97485 to allow passing in the right function to extract symbols from object files to a generic archive builder to be used by cg_llvm, cg_clif and cg_gcc.

compiler/rustc_codegen_cranelift/src/archive.rs

@@ -5,7 +5,7 @@ use std::fs::File;
 use std::io::{self, Read, Seek};
 use std::path::{Path, PathBuf};
 
-use rustc_codegen_ssa::back::archive::ArchiveBuilder;
+use rustc_codegen_ssa::back::archive::{ArchiveBuilder, ArchiveBuilderBuilder};
 use rustc_session::Session;
 
 use object::read::archive::ArchiveFile;
@@ -17,9 +17,34 @@ enum ArchiveEntry {
     File(PathBuf),
 }
 
+pub(crate) struct ArArchiveBuilderBuilder;
+
+impl ArchiveBuilderBuilder for ArArchiveBuilderBuilder {
+    fn new_archive_builder<'a>(&self, sess: &'a Session) -> Box<dyn ArchiveBuilder<'a> + 'a> {
+        Box::new(ArArchiveBuilder {
+            sess,
+            use_gnu_style_archive: sess.target.archive_format == "gnu",
+            // FIXME fix builtin ranlib on macOS
+            no_builtin_ranlib: sess.target.is_like_osx,
+
+            src_archives: vec![],
+            entries: vec![],
+        })
+    }
+
+    fn create_dll_import_lib(
+        &self,
+        _sess: &Session,
+        _lib_name: &str,
+        _dll_imports: &[rustc_session::cstore::DllImport],
+        _tmpdir: &Path,
+    ) -> PathBuf {
+        bug!("creating dll imports is not supported");
+    }
+}
+
 pub(crate) struct ArArchiveBuilder<'a> {
     sess: &'a Session,
-    dst: PathBuf,
     use_gnu_style_archive: bool,
     no_builtin_ranlib: bool,
 
@@ -30,30 +55,18 @@ pub(crate) struct ArArchiveBuilder<'a> {
 }
 
 impl<'a> ArchiveBuilder<'a> for ArArchiveBuilder<'a> {
-    fn new(sess: &'a Session, output: &Path) -> Self {
-        ArArchiveBuilder {
-            sess,
-            dst: output.to_path_buf(),
-            use_gnu_style_archive: sess.target.archive_format == "gnu",
-            // FIXME fix builtin ranlib on macOS
-            no_builtin_ranlib: sess.target.is_like_osx,
-
-            src_archives: vec![],
-            entries: vec![],
-        }
-    }
-
     fn add_file(&mut self, file: &Path) {
         self.entries.push((
             file.file_name().unwrap().to_str().unwrap().to_string().into_bytes(),
             ArchiveEntry::File(file.to_owned()),
         ));
     }
 
-    fn add_archive<F>(&mut self, archive_path: &Path, mut skip: F) -> std::io::Result<()>
-    where
-        F: FnMut(&str) -> bool + 'static,
-    {
+    fn add_archive(
+        &mut self,
+        archive_path: &Path,
+        mut skip: Box<dyn FnMut(&str) -> bool + 'static>,
+    ) -> std::io::Result<()> {
         let read_cache = ReadCache::new(std::fs::File::open(&archive_path)?);
         let archive = ArchiveFile::parse(&read_cache).unwrap();
         let archive_index = self.src_archives.len();
@@ -74,7 +87,7 @@ impl<'a> ArchiveBuilder<'a> for ArArchiveBuilder<'a> {
         Ok(())
     }
 
-    fn build(mut self) -> bool {
+    fn build(mut self: Box<Self>, output: &Path) -> bool {
         enum BuilderKind {
             Bsd(ar::Builder<File>),
             Gnu(ar::GnuBuilder<File>),
@@ -163,7 +176,7 @@ impl<'a> ArchiveBuilder<'a> for ArArchiveBuilder<'a> {
         let mut builder = if self.use_gnu_style_archive {
             BuilderKind::Gnu(
                 ar::GnuBuilder::new(
-                    File::create(&self.dst).unwrap_or_else(|err| {
+                    File::create(output).unwrap_or_else(|err| {
                         sess.fatal(&format!(
                             "error opening destination during archive building: {}",
                             err
@@ -178,7 +191,7 @@ impl<'a> ArchiveBuilder<'a> for ArArchiveBuilder<'a> {
         } else {
             BuilderKind::Bsd(
                 ar::Builder::new(
-                    File::create(&self.dst).unwrap_or_else(|err| {
+                    File::create(output).unwrap_or_else(|err| {
                         sess.fatal(&format!(
                             "error opening destination during archive building: {}",
                             err
@@ -209,7 +222,7 @@ impl<'a> ArchiveBuilder<'a> for ArArchiveBuilder<'a> {
 
             // Run ranlib to be able to link the archive
             let status = std::process::Command::new(ranlib)
-                .arg(self.dst)
+                .arg(output)
                 .status()
                 .expect("Couldn't run ranlib");
 
@@ -220,17 +233,4 @@ impl<'a> ArchiveBuilder<'a> for ArArchiveBuilder<'a> {
 
         any_members
     }
-
-    fn sess(&self) -> &Session {
-        self.sess
-    }
-
-    fn create_dll_import_lib(
-        _sess: &Session,
-        _lib_name: &str,
-        _dll_imports: &[rustc_session::cstore::DllImport],
-        _tmpdir: &Path,
-    ) -> PathBuf {
-        bug!("creating dll imports is not supported");
-    }
 }

compiler/rustc_codegen_cranelift/src/lib.rs

@@ -226,7 +226,7 @@ impl CodegenBackend for CraneliftCodegenBackend {
     ) -> Result<(), ErrorGuaranteed> {
         use rustc_codegen_ssa::back::link::link_binary;
 
-        link_binary::<crate::archive::ArArchiveBuilder<'_>>(sess, &codegen_results, outputs)
+        link_binary(sess, &crate::archive::ArArchiveBuilderBuilder, &codegen_results, outputs)
     }
 }
 

compiler/rustc_codegen_gcc/src/archive.rs

@@ -1,14 +1,13 @@
 use std::fs::File;
 use std::path::{Path, PathBuf};
 
-use rustc_codegen_ssa::back::archive::ArchiveBuilder;
+use rustc_codegen_ssa::back::archive::{ArchiveBuilder, ArchiveBuilderBuilder};
 use rustc_session::Session;
 
 use rustc_session::cstore::DllImport;
 
 struct ArchiveConfig<'a> {
     sess: &'a Session,
-    dst: PathBuf,
     use_native_ar: bool,
     use_gnu_style_archive: bool,
 }
@@ -22,42 +21,56 @@ enum ArchiveEntry {
     File(PathBuf),
 }
 
-pub struct ArArchiveBuilder<'a> {
-    config: ArchiveConfig<'a>,
-    src_archives: Vec<(PathBuf, ar::Archive<File>)>,
-    // Don't use `HashMap` here, as the order is important. `rust.metadata.bin` must always be at
-    // the end of an archive for linkers to not get confused.
-    entries: Vec<(String, ArchiveEntry)>,
-}
+pub struct ArArchiveBuilderBuilder;
 
-impl<'a> ArchiveBuilder<'a> for ArArchiveBuilder<'a> {
-    fn new(sess: &'a Session, output: &Path) -> Self {
+impl ArchiveBuilderBuilder for ArArchiveBuilderBuilder {
+    fn new_archive_builder<'a>(&self, sess: &'a Session) -> Box<dyn ArchiveBuilder<'a> + 'a> {
         let config = ArchiveConfig {
             sess,
-            dst: output.to_path_buf(),
             use_native_ar: false,
             // FIXME test for linux and System V derivatives instead
             use_gnu_style_archive: sess.target.options.archive_format == "gnu",
         };
 
-        ArArchiveBuilder {
+        Box::new(ArArchiveBuilder {
             config,
             src_archives: vec![],
             entries: vec![],
-        }
+        })
+    }
+
+    fn create_dll_import_lib(
+        &self,
+        _sess: &Session,
+        _lib_name: &str,
+        _dll_imports: &[DllImport],
+        _tmpdir: &Path,
+    ) -> PathBuf {
+        unimplemented!();
     }
+}
 
+pub struct ArArchiveBuilder<'a> {
+    config: ArchiveConfig<'a>,
+    src_archives: Vec<(PathBuf, ar::Archive<File>)>,
+    // Don't use `HashMap` here, as the order is important. `rust.metadata.bin` must always be at
+    // the end of an archive for linkers to not get confused.
+    entries: Vec<(String, ArchiveEntry)>,
+}
+
+impl<'a> ArchiveBuilder<'a> for ArArchiveBuilder<'a> {
     fn add_file(&mut self, file: &Path) {
         self.entries.push((
             file.file_name().unwrap().to_str().unwrap().to_string(),
             ArchiveEntry::File(file.to_owned()),
         ));
     }
 
-    fn add_archive<F>(&mut self, archive_path: &Path, mut skip: F) -> std::io::Result<()>
-    where
-        F: FnMut(&str) -> bool + 'static,
-    {
+    fn add_archive(
+        &mut self,
+        archive_path: &Path,
+        mut skip: Box<dyn FnMut(&str) -> bool + 'static>,
+    ) -> std::io::Result<()> {
         let mut archive = ar::Archive::new(std::fs::File::open(&archive_path)?);
         let archive_index = self.src_archives.len();
 
@@ -77,7 +90,7 @@ impl<'a> ArchiveBuilder<'a> for ArArchiveBuilder<'a> {
         Ok(())
     }
 
-    fn build(mut self) -> bool {
+    fn build(mut self: Box<Self>, output: &Path) -> bool {
         use std::process::Command;
 
         fn add_file_using_ar(archive: &Path, file: &Path) {
@@ -97,17 +110,17 @@ impl<'a> ArchiveBuilder<'a> for ArArchiveBuilder<'a> {
         }
 
         let mut builder = if self.config.use_native_ar {
-            BuilderKind::NativeAr(&self.config.dst)
+            BuilderKind::NativeAr(output)
         } else if self.config.use_gnu_style_archive {
             BuilderKind::Gnu(ar::GnuBuilder::new(
-                File::create(&self.config.dst).unwrap(),
+                File::create(output).unwrap(),
                 self.entries
                     .iter()
                     .map(|(name, _)| name.as_bytes().to_vec())
                     .collect(),
             ))
         } else {
-            BuilderKind::Bsd(ar::Builder::new(File::create(&self.config.dst).unwrap()))
+            BuilderKind::Bsd(ar::Builder::new(File::create(output).unwrap()))
         };
 
         let any_members = !self.entries.is_empty();
@@ -164,28 +177,13 @@ impl<'a> ArchiveBuilder<'a> for ArArchiveBuilder<'a> {
         std::mem::drop(builder);
 
         // Run ranlib to be able to link the archive
-        let status = std::process::Command::new("ranlib")
-            .arg(self.config.dst)
-            .status()
-            .expect("Couldn't run ranlib");
+        let status =
+            std::process::Command::new("ranlib").arg(output).status().expect("Couldn't run ranlib");
 
         if !status.success() {
             self.config.sess.fatal(&format!("Ranlib exited with code {:?}", status.code()));
         }
 
         any_members
     }
-
-    fn sess(&self) -> &Session {
-        self.config.sess
-    }
-
-    fn create_dll_import_lib(
-        _sess: &Session,
-        _lib_name: &str,
-        _dll_imports: &[DllImport],
-        _tmpdir: &Path,
-    ) -> PathBuf {
-        unimplemented!();
-    }
 }

compiler/rustc_codegen_gcc/src/lib.rs

@@ -133,8 +133,9 @@ impl CodegenBackend for GccCodegenBackend {
     fn link(&self, sess: &Session, codegen_results: CodegenResults, outputs: &OutputFilenames) -> Result<(), ErrorGuaranteed> {
         use rustc_codegen_ssa::back::link::link_binary;
 
-        link_binary::<crate::archive::ArArchiveBuilder<'_>>(
+        link_binary(
             sess,
+            &crate::archive::ArArchiveBuilderBuilder,
             &codegen_results,
             outputs,
         )

compiler/rustc_codegen_llvm/src/back/archive.rs

@@ -10,15 +10,14 @@ use std::str;
 
 use crate::llvm::archive_ro::{ArchiveRO, Child};
 use crate::llvm::{self, ArchiveKind, LLVMMachineType, LLVMRustCOFFShortExport};
-use rustc_codegen_ssa::back::archive::ArchiveBuilder;
+use rustc_codegen_ssa::back::archive::{ArchiveBuilder, ArchiveBuilderBuilder};
 use rustc_session::cstore::{DllCallingConvention, DllImport};
 use rustc_session::Session;
 
 /// Helper for adding many files to an archive.
 #[must_use = "must call build() to finish building the archive"]
 pub struct LlvmArchiveBuilder<'a> {
     sess: &'a Session,
-    dst: PathBuf,
     additions: Vec<Addition>,
 }
 
@@ -54,16 +53,11 @@ fn llvm_machine_type(cpu: &str) -> LLVMMachineType {
 }
 
 impl<'a> ArchiveBuilder<'a> for LlvmArchiveBuilder<'a> {
-    /// Creates a new static archive, ready for modifying the archive specified
-    /// by `config`.
-    fn new(sess: &'a Session, output: &Path) -> LlvmArchiveBuilder<'a> {
-        LlvmArchiveBuilder { sess, dst: output.to_path_buf(), additions: Vec::new() }
-    }
-
-    fn add_archive<F>(&mut self, archive: &Path, skip: F) -> io::Result<()>
-    where
-        F: FnMut(&str) -> bool + 'static,
-    {
+    fn add_archive(
+        &mut self,
+        archive: &Path,
+        skip: Box<dyn FnMut(&str) -> bool + 'static>,
+    ) -> io::Result<()> {
         let archive_ro = match ArchiveRO::open(archive) {
             Ok(ar) => ar,
             Err(e) => return Err(io::Error::new(io::ErrorKind::Other, e)),
@@ -88,18 +82,23 @@ impl<'a> ArchiveBuilder<'a> for LlvmArchiveBuilder<'a> {
 
     /// Combine the provided files, rlibs, and native libraries into a single
     /// `Archive`.
-    fn build(mut self) -> bool {
-        match self.build_with_llvm() {
+    fn build(mut self: Box<Self>, output: &Path) -> bool {
+        match self.build_with_llvm(output) {
             Ok(any_members) => any_members,
             Err(e) => self.sess.fatal(&format!("failed to build archive: {}", e)),
         }
     }
+}
+
+pub struct LlvmArchiveBuilderBuilder;
 
-    fn sess(&self) -> &Session {
-        self.sess
+impl ArchiveBuilderBuilder for LlvmArchiveBuilderBuilder {
+    fn new_archive_builder<'a>(&self, sess: &'a Session) -> Box<dyn ArchiveBuilder<'a> + 'a> {
+        Box::new(LlvmArchiveBuilder { sess, additions: Vec::new() })
     }
 
     fn create_dll_import_lib(
+        &self,
         sess: &Session,
         lib_name: &str,
         dll_imports: &[DllImport],
@@ -241,7 +240,7 @@ impl<'a> ArchiveBuilder<'a> for LlvmArchiveBuilder<'a> {
 }
 
 impl<'a> LlvmArchiveBuilder<'a> {
-    fn build_with_llvm(&mut self) -> io::Result<bool> {
+    fn build_with_llvm(&mut self, output: &Path) -> io::Result<bool> {
         let kind = &*self.sess.target.archive_format;
         let kind = kind.parse::<ArchiveKind>().map_err(|_| kind).unwrap_or_else(|kind| {
             self.sess.fatal(&format!("Don't know how to build archive of type: {}", kind))
@@ -251,7 +250,7 @@ impl<'a> LlvmArchiveBuilder<'a> {
         let mut strings = Vec::new();
         let mut members = Vec::new();
 
-        let dst = CString::new(self.dst.to_str().unwrap())?;
+        let dst = CString::new(output.to_str().unwrap())?;
 
         unsafe {
             for addition in &mut additions {