FIx review comments

src/backend.rs

@@ -42,24 +42,21 @@ impl WriteMetadata for faerie::Artifact {
 }
 
 impl WriteMetadata for object::write::Object {
-    fn add_rustc_section(&mut self, symbol_name: String, data: Vec<u8>, is_like_osx: bool) {
+    fn add_rustc_section(&mut self, symbol_name: String, data: Vec<u8>, _is_like_osx: bool) {
         let segment = self.segment_name(object::write::StandardSegment::Data).to_vec();
         let section_id = self.add_section(segment, b".rustc".to_vec(), object::SectionKind::Data);
         let offset = self.append_section_data(section_id, &data, 1);
-        // FIXME implement faerie elf backend section custom symbols
-        // For MachO this is necessary to prevent the linker from throwing away the .rustc section,
-        // but for ELF it isn't.
-        if is_like_osx {
-            self.add_symbol(object::write::Symbol {
-                name: symbol_name.into_bytes(),
-                value: offset,
-                size: data.len() as u64,
-                kind: object::SymbolKind::Data,
-                scope: object::SymbolScope::Compilation,
-                weak: false,
-                section: Some(section_id),
-            });
-        }
+        // For MachO and probably PE this is necessary to prevent the linker from throwing away the
+        // .rustc section. For ELF this isn't necessary, but it also doesn't harm.
+        self.add_symbol(object::write::Symbol {
+            name: symbol_name.into_bytes(),
+            value: offset,
+            size: data.len() as u64,
+            kind: object::SymbolKind::Data,
+            scope: object::SymbolScope::Compilation,
+            weak: false,
+            section: Some(section_id),
+        });
     }
 }
 
@@ -70,7 +67,7 @@ pub trait WriteDebugInfo {
     fn add_debug_reloc(
         &mut self,
         section_map: &HashMap<SectionId, Self::SectionId>,
-        symbol_map: &indexmap::IndexSet<(String, FuncId)>,
+        symbol_map: &indexmap::IndexMap<FuncId, String>,
         from: &Self::SectionId,
         reloc: &DebugReloc,
     );
@@ -87,7 +84,7 @@ impl WriteDebugInfo for FaerieProduct {
     fn add_debug_reloc(
         &mut self,
         _section_map: &HashMap<SectionId, Self::SectionId>,
-        symbol_map: &indexmap::IndexSet<(String, FuncId)>,
+        symbol_map: &indexmap::IndexMap<FuncId, String>,
         from: &Self::SectionId,
         reloc: &DebugReloc,
     ) {
@@ -98,7 +95,7 @@ impl WriteDebugInfo for FaerieProduct {
                     from: from.name(),
                     to: match reloc.name {
                         DebugRelocName::Section(id) => id.name(),
-                        DebugRelocName::Symbol(index) => &symbol_map.get_index(index).unwrap().0,
+                        DebugRelocName::Symbol(index) => &symbol_map.get_index(index).unwrap().1,
                     },
                     at: u64::from(reloc.offset),
                 },
@@ -130,15 +127,14 @@ impl WriteDebugInfo for ObjectProduct {
     fn add_debug_reloc(
         &mut self,
         section_map: &HashMap<SectionId, Self::SectionId>,
-        symbol_map: &indexmap::IndexSet<(String, FuncId)>,
+        symbol_map: &indexmap::IndexMap<FuncId, String>,
         from: &Self::SectionId,
         reloc: &DebugReloc,
     ) {
         let symbol = match reloc.name {
             DebugRelocName::Section(id) => section_map.get(&id).unwrap().1,
             DebugRelocName::Symbol(id) => {
-                let (_func_name, func_id) = symbol_map.get_index(id).unwrap();
-                self.function_symbol(*func_id)
+                self.function_symbol(*symbol_map.get_index(id).unwrap().0)
             }
         };
         self.object.add_relocation(from.0, Relocation {

src/debuginfo.rs

@@ -71,7 +71,7 @@ pub enum DebugRelocName {
 
 pub struct DebugContext<'tcx> {
     endian: RunTimeEndian,
-    symbols: indexmap::IndexSet<(String, FuncId)>,
+    symbols: indexmap::IndexMap<FuncId, String>,
 
     dwarf: DwarfUnit,
     unit_range_list: RangeList,
@@ -133,7 +133,7 @@ impl<'tcx> DebugContext<'tcx> {
 
         DebugContext {
             endian: target_endian(tcx),
-            symbols: indexmap::IndexSet::new(),
+            symbols: indexmap::IndexMap::new(),
 
             dwarf,
             unit_range_list: RangeList(Vec::new()),
@@ -216,7 +216,7 @@ impl<'a, 'tcx> FunctionDebugContext<'a, 'tcx> {
         name: &str,
         _sig: &Signature,
     ) -> Self {
-        let (symbol, _) = debug_context.symbols.insert_full((name.to_string(), func_id));
+        let (symbol, _) = debug_context.symbols.insert_full(func_id, name.to_string());
 
         // FIXME: add to appropriate scope intead of root
         let scope = debug_context.dwarf.unit.root();

src/driver.rs

@@ -174,7 +174,7 @@ fn run_aot(
             let obj = product.emit();
             std::fs::write(&tmp_file, obj).unwrap();
             CompiledModule {
-                name: name,
+                name,
                 kind,
                 object: Some(tmp_file),
                 bytecode: None,