Merge pull request #1472 from rust-lang/debuginfo_improvements2

Add debuginfo for statics

Author: bjorn3

src/base.rs

@@ -95,7 +95,6 @@ pub(crate) fn codegen_fn<'tcx>(
         caller_location: None, // set by `codegen_fn_prelude`
 
         clif_comments,
-        last_source_file: None,
         next_ssa_var: 0,
     };
 

src/common.rs

@@ -1,12 +1,9 @@
 use cranelift_codegen::isa::TargetFrontendConfig;
-use gimli::write::FileId;
-use rustc_data_structures::sync::Lrc;
 use rustc_index::IndexVec;
 use rustc_middle::ty::layout::{
     FnAbiError, FnAbiOfHelpers, FnAbiRequest, LayoutError, LayoutOfHelpers,
 };
 use rustc_span::source_map::Spanned;
-use rustc_span::SourceFile;
 use rustc_target::abi::call::FnAbi;
 use rustc_target::abi::{Integer, Primitive};
 use rustc_target::spec::{HasTargetSpec, Target};
@@ -305,11 +302,6 @@ pub(crate) struct FunctionCx<'m, 'clif, 'tcx: 'm> {
 
     pub(crate) clif_comments: crate::pretty_clif::CommentWriter,
 
-    /// Last accessed source file and it's debuginfo file id.
-    ///
-    /// For optimization purposes only
-    pub(crate) last_source_file: Option<(Lrc<SourceFile>, FileId)>,
-
     /// This should only be accessed by `CPlace::new_var`.
     pub(crate) next_ssa_var: u32,
 }
@@ -419,25 +411,8 @@ impl<'tcx> FunctionCx<'_, '_, 'tcx> {
 
     pub(crate) fn set_debug_loc(&mut self, source_info: mir::SourceInfo) {
         if let Some(debug_context) = &mut self.cx.debug_context {
-            let (file, line, column) =
-                DebugContext::get_span_loc(self.tcx, self.mir.span, source_info.span);
-
-            // add_source_file is very slow.
-            // Optimize for the common case of the current file not being changed.
-            let mut cached_file_id = None;
-            if let Some((ref last_source_file, last_file_id)) = self.last_source_file {
-                // If the allocations are not equal, the files may still be equal, but that
-                // doesn't matter, as this is just an optimization.
-                if rustc_data_structures::sync::Lrc::ptr_eq(last_source_file, &file) {
-                    cached_file_id = Some(last_file_id);
-                }
-            }
-
-            let file_id = if let Some(file_id) = cached_file_id {
-                file_id
-            } else {
-                debug_context.add_source_file(&file)
-            };
+            let (file_id, line, column) =
+                debug_context.get_span_loc(self.tcx, self.mir.span, source_info.span);
 
             let source_loc =
                 self.func_debug_cx.as_mut().unwrap().add_dbg_loc(file_id, line, column);

src/constant.rs

@@ -31,10 +31,16 @@ impl ConstantCx {
     }
 }
 
-pub(crate) fn codegen_static(tcx: TyCtxt<'_>, module: &mut dyn Module, def_id: DefId) {
+pub(crate) fn codegen_static(tcx: TyCtxt<'_>, module: &mut dyn Module, def_id: DefId) -> DataId {
     let mut constants_cx = ConstantCx::new();
     constants_cx.todo.push(TodoItem::Static(def_id));
     constants_cx.finalize(tcx, module);
+
+    data_id_for_static(
+        tcx, module, def_id, false,
+        // For a declaration the stated mutability doesn't matter.
+        false,
+    )
 }
 
 pub(crate) fn codegen_tls_ref<'tcx>(

src/debuginfo/emit.rs

@@ -1,5 +1,6 @@
 //! Write the debuginfo into an object file.
 
+use cranelift_module::{DataId, FuncId};
 use cranelift_object::ObjectProduct;
 use gimli::write::{Address, AttributeValue, EndianVec, Result, Sections, Writer};
 use gimli::{RunTimeEndian, SectionId};
@@ -8,6 +9,18 @@ use rustc_data_structures::fx::FxHashMap;
 use super::object::WriteDebugInfo;
 use super::DebugContext;
 
+pub(super) fn address_for_func(func_id: FuncId) -> Address {
+    let symbol = func_id.as_u32();
+    assert!(symbol & 1 << 31 == 0);
+    Address::Symbol { symbol: symbol as usize, addend: 0 }
+}
+
+pub(super) fn address_for_data(data_id: DataId) -> Address {
+    let symbol = data_id.as_u32();
+    assert!(symbol & 1 << 31 == 0);
+    Address::Symbol { symbol: (symbol | 1 << 31) as usize, addend: 0 }
+}
+
 impl DebugContext {
     pub(crate) fn emit(&mut self, product: &mut ObjectProduct) {
         let unit_range_list_id = self.dwarf.unit.ranges.add(self.unit_range_list.clone());
@@ -171,6 +184,7 @@ impl Writer for WriterRelocate {
                 gimli::DW_EH_PE_pcrel => {
                     let size = match eh_pe.format() {
                         gimli::DW_EH_PE_sdata4 => 4,
+                        gimli::DW_EH_PE_sdata8 => 8,
                         _ => return Err(gimli::write::Error::UnsupportedPointerEncoding(eh_pe)),
                     };
                     self.relocs.push(DebugReloc {

src/debuginfo/line_info.rs

@@ -5,14 +5,12 @@ use std::path::{Component, Path};
 
 use cranelift_codegen::binemit::CodeOffset;
 use cranelift_codegen::MachSrcLoc;
-use gimli::write::{
-    Address, AttributeValue, FileId, FileInfo, LineProgram, LineString, LineStringTable,
-};
-use rustc_data_structures::sync::Lrc;
+use gimli::write::{AttributeValue, FileId, FileInfo, LineProgram, LineString, LineStringTable};
 use rustc_span::{
     FileName, Pos, SourceFile, SourceFileAndLine, SourceFileHash, SourceFileHashAlgorithm,
 };
 
+use crate::debuginfo::emit::address_for_func;
 use crate::debuginfo::FunctionDebugContext;
 use crate::prelude::*;
 
@@ -60,72 +58,78 @@ fn make_file_info(hash: SourceFileHash) -> Option<FileInfo> {
 
 impl DebugContext {
     pub(crate) fn get_span_loc(
+        &mut self,
         tcx: TyCtxt<'_>,
         function_span: Span,
         span: Span,
-    ) -> (Lrc<SourceFile>, u64, u64) {
+    ) -> (FileId, u64, u64) {
         // Based on https://github.com/rust-lang/rust/blob/e369d87b015a84653343032833d65d0545fd3f26/src/librustc_codegen_ssa/mir/mod.rs#L116-L131
         // In order to have a good line stepping behavior in debugger, we overwrite debug
         // locations of macro expansions with that of the outermost expansion site (when the macro is
         // annotated with `#[collapse_debuginfo]` or when `-Zdebug-macros` is provided).
         let span = tcx.collapsed_debuginfo(span, function_span);
         match tcx.sess.source_map().lookup_line(span.lo()) {
             Ok(SourceFileAndLine { sf: file, line }) => {
+                let file_id = self.add_source_file(&file);
                 let line_pos = file.lines()[line];
                 let col = file.relative_position(span.lo()) - line_pos;
 
-                (file, u64::try_from(line).unwrap() + 1, u64::from(col.to_u32()) + 1)
+                (file_id, u64::try_from(line).unwrap() + 1, u64::from(col.to_u32()) + 1)
             }
-            Err(file) => (file, 0, 0),
+            Err(file) => (self.add_source_file(&file), 0, 0),
         }
     }
 
     pub(crate) fn add_source_file(&mut self, source_file: &SourceFile) -> FileId {
-        let line_program: &mut LineProgram = &mut self.dwarf.unit.line_program;
-        let line_strings: &mut LineStringTable = &mut self.dwarf.line_strings;
-
-        match &source_file.name {
-            FileName::Real(path) => {
-                let (dir_path, file_name) =
-                    split_path_dir_and_file(if self.should_remap_filepaths {
-                        path.remapped_path_if_available()
-                    } else {
-                        path.local_path_if_available()
-                    });
-                let dir_name = osstr_as_utf8_bytes(dir_path.as_os_str());
-                let file_name = osstr_as_utf8_bytes(file_name);
-
-                let dir_id = if !dir_name.is_empty() {
-                    let dir_name = LineString::new(dir_name, line_program.encoding(), line_strings);
-                    line_program.add_directory(dir_name)
-                } else {
-                    line_program.default_directory()
-                };
-                let file_name = LineString::new(file_name, line_program.encoding(), line_strings);
-
-                let info = make_file_info(source_file.src_hash);
-
-                line_program.file_has_md5 &= info.is_some();
-                line_program.add_file(file_name, dir_id, info)
-            }
-            // FIXME give more appropriate file names
-            filename => {
-                let dir_id = line_program.default_directory();
-                let dummy_file_name = LineString::new(
-                    filename
-                        .display(if self.should_remap_filepaths {
-                            FileNameDisplayPreference::Remapped
+        let cache_key = (source_file.stable_id, source_file.src_hash);
+        *self.created_files.entry(cache_key).or_insert_with(|| {
+            let line_program: &mut LineProgram = &mut self.dwarf.unit.line_program;
+            let line_strings: &mut LineStringTable = &mut self.dwarf.line_strings;
+
+            match &source_file.name {
+                FileName::Real(path) => {
+                    let (dir_path, file_name) =
+                        split_path_dir_and_file(if self.should_remap_filepaths {
+                            path.remapped_path_if_available()
                         } else {
-                            FileNameDisplayPreference::Local
-                        })
-                        .to_string()
-                        .into_bytes(),
-                    line_program.encoding(),
-                    line_strings,
-                );
-                line_program.add_file(dummy_file_name, dir_id, None)
+                            path.local_path_if_available()
+                        });
+                    let dir_name = osstr_as_utf8_bytes(dir_path.as_os_str());
+                    let file_name = osstr_as_utf8_bytes(file_name);
+
+                    let dir_id = if !dir_name.is_empty() {
+                        let dir_name =
+                            LineString::new(dir_name, line_program.encoding(), line_strings);
+                        line_program.add_directory(dir_name)
+                    } else {
+                        line_program.default_directory()
+                    };
+                    let file_name =
+                        LineString::new(file_name, line_program.encoding(), line_strings);
+
+                    let info = make_file_info(source_file.src_hash);
+
+                    line_program.file_has_md5 &= info.is_some();
+                    line_program.add_file(file_name, dir_id, info)
+                }
+                filename => {
+                    let dir_id = line_program.default_directory();
+                    let dummy_file_name = LineString::new(
+                        filename
+                            .display(if self.should_remap_filepaths {
+                                FileNameDisplayPreference::Remapped
+                            } else {
+                                FileNameDisplayPreference::Local
+                            })
+                            .to_string()
+                            .into_bytes(),
+                        line_program.encoding(),
+                        line_strings,
+                    );
+                    line_program.add_file(dummy_file_name, dir_id, None)
+                }
             }
-        }
+        })
     }
 }
 
@@ -138,7 +142,7 @@ impl FunctionDebugContext {
     pub(super) fn create_debug_lines(
         &mut self,
         debug_context: &mut DebugContext,
-        symbol: usize,
+        func_id: FuncId,
         context: &Context,
     ) -> CodeOffset {
         let create_row_for_span =
@@ -151,11 +155,7 @@ impl FunctionDebugContext {
                 debug_context.dwarf.unit.line_program.generate_row();
             };
 
-        debug_context
-            .dwarf
-            .unit
-            .line_program
-            .begin_sequence(Some(Address::Symbol { symbol, addend: 0 }));
+        debug_context.dwarf.unit.line_program.begin_sequence(Some(address_for_func(func_id)));
 
         let mut func_end = 0;
 
@@ -178,10 +178,7 @@ impl FunctionDebugContext {
         assert_ne!(func_end, 0);
 
         let entry = debug_context.dwarf.unit.get_mut(self.entry_id);
-        entry.set(
-            gimli::DW_AT_low_pc,
-            AttributeValue::Address(Address::Symbol { symbol, addend: 0 }),
-        );
+        entry.set(gimli::DW_AT_low_pc, AttributeValue::Address(address_for_func(func_id)));
         entry.set(gimli::DW_AT_high_pc, AttributeValue::Udata(u64::from(func_end)));
 
         func_end

src/debuginfo/mod.rs

@@ -3,22 +3,28 @@
 mod emit;
 mod line_info;
 mod object;
+mod types;
 mod unwind;
 
 use cranelift_codegen::ir::Endianness;
 use cranelift_codegen::isa::TargetIsa;
+use cranelift_module::DataId;
 use gimli::write::{
     Address, AttributeValue, DwarfUnit, Expression, FileId, LineProgram, LineString, Range,
     RangeList, UnitEntryId,
 };
 use gimli::{AArch64, Encoding, Format, LineEncoding, Register, RiscV, RunTimeEndian, X86_64};
 use indexmap::IndexSet;
 use rustc_codegen_ssa::debuginfo::type_names;
+use rustc_hir::def::DefKind;
 use rustc_hir::def_id::DefIdMap;
 use rustc_session::Session;
+use rustc_span::{SourceFileHash, StableSourceFileId};
 
 pub(crate) use self::emit::{DebugReloc, DebugRelocName};
+pub(crate) use self::types::TypeDebugContext;
 pub(crate) use self::unwind::UnwindContext;
+use crate::debuginfo::emit::{address_for_data, address_for_func};
 use crate::prelude::*;
 
 pub(crate) fn producer(sess: &Session) -> String {
@@ -30,8 +36,10 @@ pub(crate) struct DebugContext {
 
     dwarf: DwarfUnit,
     unit_range_list: RangeList,
+    created_files: FxHashMap<(StableSourceFileId, SourceFileHash), FileId>,
     stack_pointer_register: Register,
     namespace_map: DefIdMap<UnitEntryId>,
+    array_size_type: UnitEntryId,
 
     should_remap_filepaths: bool,
 }
@@ -126,12 +134,27 @@ impl DebugContext {
             root.set(gimli::DW_AT_low_pc, AttributeValue::Address(Address::Constant(0)));
         }
 
+        let array_size_type = dwarf.unit.add(dwarf.unit.root(), gimli::DW_TAG_base_type);
+        let array_size_type_entry = dwarf.unit.get_mut(array_size_type);
+        array_size_type_entry.set(
+            gimli::DW_AT_name,
+            AttributeValue::StringRef(dwarf.strings.add("__ARRAY_SIZE_TYPE__")),
+        );
+        array_size_type_entry
+            .set(gimli::DW_AT_encoding, AttributeValue::Encoding(gimli::DW_ATE_unsigned));
+        array_size_type_entry.set(
+            gimli::DW_AT_byte_size,
+            AttributeValue::Udata(isa.frontend_config().pointer_bytes().into()),
+        );
+
         DebugContext {
             endian,
             dwarf,
             unit_range_list: RangeList(Vec::new()),
+            created_files: FxHashMap::default(),
             stack_pointer_register,
             namespace_map: DefIdMap::default(),
+            array_size_type,
             should_remap_filepaths,
         }
     }
@@ -169,11 +192,8 @@ impl DebugContext {
         linkage_name: &str,
         function_span: Span,
     ) -> FunctionDebugContext {
-        let (file, line, column) = DebugContext::get_span_loc(tcx, function_span, function_span);
+        let (file_id, line, column) = self.get_span_loc(tcx, function_span, function_span);
 
-        let file_id = self.add_source_file(&file);
-
-        // FIXME: add to appropriate scope instead of root
         let scope = self.item_namespace(tcx, tcx.parent(instance.def_id()));
 
         let mut name = String::new();
@@ -230,6 +250,62 @@ impl DebugContext {
             source_loc_set: IndexSet::new(),
         }
     }
+
+    // Adapted from https://github.com/rust-lang/rust/blob/10a7aa14fed9b528b74b0f098c4899c37c09a9c7/compiler/rustc_codegen_llvm/src/debuginfo/metadata.rs#L1288-L1346
+    pub(crate) fn define_static<'tcx>(
+        &mut self,
+        tcx: TyCtxt<'tcx>,
+        type_dbg: &mut TypeDebugContext<'tcx>,
+        def_id: DefId,
+        data_id: DataId,
+    ) {
+        let DefKind::Static { nested, .. } = tcx.def_kind(def_id) else { bug!() };
+        if nested {
+            return;
+        }
+
+        let scope = self.item_namespace(tcx, tcx.parent(def_id));
+
+        let span = tcx.def_span(def_id);
+        let (file_id, line, _column) = self.get_span_loc(tcx, span, span);
+
+        let static_type = Instance::mono(tcx, def_id).ty(tcx, ty::ParamEnv::reveal_all());
+        let static_layout = tcx.layout_of(ty::ParamEnv::reveal_all().and(static_type)).unwrap();
+        // FIXME use the actual type layout
+        let type_id = self.debug_type(tcx, type_dbg, static_type);
+
+        let name = tcx.item_name(def_id);
+        let linkage_name = tcx.symbol_name(Instance::mono(tcx, def_id)).name;
+
+        let entry_id = self.dwarf.unit.add(scope, gimli::DW_TAG_variable);
+        let entry = self.dwarf.unit.get_mut(entry_id);
+        let linkage_name_id = if name.as_str() != linkage_name {
+            Some(self.dwarf.strings.add(linkage_name))
+        } else {
+            None
+        };
+        let name_id = self.dwarf.strings.add(name.as_str());
+
+        entry.set(gimli::DW_AT_name, AttributeValue::StringRef(name_id));
+        entry.set(gimli::DW_AT_type, AttributeValue::UnitRef(type_id));
+
+        if tcx.is_reachable_non_generic(def_id) {
+            entry.set(gimli::DW_AT_external, AttributeValue::FlagPresent);
+        }
+
+        entry.set(gimli::DW_AT_decl_file, AttributeValue::FileIndex(Some(file_id)));
+        entry.set(gimli::DW_AT_decl_line, AttributeValue::Udata(line));
+
+        entry.set(gimli::DW_AT_alignment, AttributeValue::Udata(static_layout.align.pref.bytes()));
+
+        let mut expr = Expression::new();
+        expr.op_addr(address_for_data(data_id));
+        entry.set(gimli::DW_AT_location, AttributeValue::Exprloc(expr));
+
+        if let Some(linkage_name_id) = linkage_name_id {
+            entry.set(gimli::DW_AT_linkage_name, AttributeValue::StringRef(linkage_name_id));
+        }
+    }
 }
 
 impl FunctionDebugContext {
@@ -239,21 +315,16 @@ impl FunctionDebugContext {
         func_id: FuncId,
         context: &Context,
     ) {
-        let symbol = func_id.as_u32() as usize;
+        let end = self.create_debug_lines(debug_context, func_id, context);
 
-        let end = self.create_debug_lines(debug_context, symbol, context);
-
-        debug_context.unit_range_list.0.push(Range::StartLength {
-            begin: Address::Symbol { symbol, addend: 0 },
-            length: u64::from(end),
-        });
+        debug_context
+            .unit_range_list
+            .0
+            .push(Range::StartLength { begin: address_for_func(func_id), length: u64::from(end) });
 
         let func_entry = debug_context.dwarf.unit.get_mut(self.entry_id);
         // Gdb requires both DW_AT_low_pc and DW_AT_high_pc. Otherwise the DW_TAG_subprogram is skipped.
-        func_entry.set(
-            gimli::DW_AT_low_pc,
-            AttributeValue::Address(Address::Symbol { symbol, addend: 0 }),
-        );
+        func_entry.set(gimli::DW_AT_low_pc, AttributeValue::Address(address_for_func(func_id)));
         // Using Udata for DW_AT_high_pc requires at least DWARF4
         func_entry.set(gimli::DW_AT_high_pc, AttributeValue::Udata(u64::from(end)));
     }

src/debuginfo/object.rs

@@ -1,4 +1,4 @@
-use cranelift_module::FuncId;
+use cranelift_module::{DataId, FuncId};
 use cranelift_object::ObjectProduct;
 use gimli::SectionId;
 use object::write::{Relocation, StandardSegment};
@@ -57,10 +57,13 @@ impl WriteDebugInfo for ObjectProduct {
         let (symbol, symbol_offset) = match reloc.name {
             DebugRelocName::Section(id) => (section_map.get(&id).unwrap().1, 0),
             DebugRelocName::Symbol(id) => {
-                let symbol_id = self.function_symbol(FuncId::from_u32(id.try_into().unwrap()));
-                self.object
-                    .symbol_section_and_offset(symbol_id)
-                    .expect("Debug reloc for undef sym???")
+                let id = id.try_into().unwrap();
+                let symbol_id = if id & 1 << 31 == 0 {
+                    self.function_symbol(FuncId::from_u32(id))
+                } else {
+                    self.data_symbol(DataId::from_u32(id & !(1 << 31)))
+                };
+                self.object.symbol_section_and_offset(symbol_id).unwrap_or((symbol_id, 0))
             }
         };
         self.object

src/debuginfo/types.rs

@@ -0,0 +1,162 @@
+// Adapted from https://github.com/rust-lang/rust/blob/10a7aa14fed9b528b74b0f098c4899c37c09a9c7/compiler/rustc_codegen_llvm/src/debuginfo/metadata.rs
+
+use gimli::write::{AttributeValue, UnitEntryId};
+use rustc_codegen_ssa::debuginfo::type_names;
+use rustc_data_structures::fx::FxHashMap;
+use rustc_middle::ty::{self, Ty, TyCtxt};
+
+use crate::{has_ptr_meta, DebugContext};
+
+#[derive(Default)]
+pub(crate) struct TypeDebugContext<'tcx> {
+    type_map: FxHashMap<Ty<'tcx>, UnitEntryId>,
+}
+
+/// Returns from the enclosing function if the type debuginfo node with the given
+/// unique ID can be found in the type map.
+macro_rules! return_if_type_created_in_meantime {
+    ($type_dbg:expr, $ty:expr) => {
+        if let Some(&type_id) = $type_dbg.type_map.get(&$ty) {
+            return type_id;
+        }
+    };
+}
+
+impl DebugContext {
+    pub(crate) fn debug_type<'tcx>(
+        &mut self,
+        tcx: TyCtxt<'tcx>,
+        type_dbg: &mut TypeDebugContext<'tcx>,
+        ty: Ty<'tcx>,
+    ) -> UnitEntryId {
+        if let Some(&type_id) = type_dbg.type_map.get(&ty) {
+            return type_id;
+        }
+
+        let type_id = match ty.kind() {
+            ty::Never | ty::Bool | ty::Char | ty::Int(_) | ty::Uint(_) | ty::Float(_) => {
+                self.basic_type(tcx, ty)
+            }
+            ty::Tuple(elems) if elems.is_empty() => self.basic_type(tcx, ty),
+            ty::Array(elem_ty, len) => self.array_type(
+                tcx,
+                type_dbg,
+                *elem_ty,
+                len.eval_target_usize(tcx, ty::ParamEnv::reveal_all()),
+            ),
+            // ty::Slice(_) | ty::Str
+            // ty::Dynamic
+            // ty::Foreign
+            ty::RawPtr(pointee_type, _) | ty::Ref(_, pointee_type, _) => {
+                self.pointer_type(tcx, type_dbg, ty, *pointee_type)
+            }
+            // ty::Adt(def, args) if def.is_box() && args.get(1).map_or(true, |arg| cx.layout_of(arg.expect_ty()).is_1zst())
+            // ty::FnDef(..) | ty::FnPtr(..)
+            // ty::Closure(..)
+            // ty::Adt(def, ..)
+            // ty::Tuple(_)
+            // ty::Param(_)
+            // FIXME implement remaining types and add unreachable!() to the fallback branch
+            _ => self.placeholder_for_type(tcx, type_dbg, ty),
+        };
+
+        type_dbg.type_map.insert(ty, type_id);
+
+        type_id
+    }
+
+    fn basic_type<'tcx>(&mut self, tcx: TyCtxt<'tcx>, ty: Ty<'tcx>) -> UnitEntryId {
+        let (name, encoding) = match ty.kind() {
+            ty::Never => ("!", gimli::DW_ATE_unsigned),
+            ty::Tuple(elems) if elems.is_empty() => ("()", gimli::DW_ATE_unsigned),
+            ty::Bool => ("bool", gimli::DW_ATE_boolean),
+            ty::Char => ("char", gimli::DW_ATE_UTF),
+            ty::Int(int_ty) => (int_ty.name_str(), gimli::DW_ATE_signed),
+            ty::Uint(uint_ty) => (uint_ty.name_str(), gimli::DW_ATE_unsigned),
+            ty::Float(float_ty) => (float_ty.name_str(), gimli::DW_ATE_float),
+            _ => unreachable!(),
+        };
+
+        let type_id = self.dwarf.unit.add(self.dwarf.unit.root(), gimli::DW_TAG_base_type);
+        let type_entry = self.dwarf.unit.get_mut(type_id);
+        type_entry.set(gimli::DW_AT_name, AttributeValue::StringRef(self.dwarf.strings.add(name)));
+        type_entry.set(gimli::DW_AT_encoding, AttributeValue::Encoding(encoding));
+        type_entry.set(
+            gimli::DW_AT_byte_size,
+            AttributeValue::Udata(
+                tcx.layout_of(ty::ParamEnv::reveal_all().and(ty)).expect("FIXME").size.bytes(),
+            ),
+        );
+
+        type_id
+    }
+
+    fn array_type<'tcx>(
+        &mut self,
+        tcx: TyCtxt<'tcx>,
+        type_dbg: &mut TypeDebugContext<'tcx>,
+        elem_ty: Ty<'tcx>,
+        len: u64,
+    ) -> UnitEntryId {
+        let elem_dw_ty = self.debug_type(tcx, type_dbg, elem_ty);
+
+        return_if_type_created_in_meantime!(type_dbg, elem_ty);
+
+        let array_type_id = self.dwarf.unit.add(self.dwarf.unit.root(), gimli::DW_TAG_array_type);
+        let array_type_entry = self.dwarf.unit.get_mut(array_type_id);
+        array_type_entry.set(gimli::DW_AT_type, AttributeValue::UnitRef(elem_dw_ty));
+
+        let subrange_id = self.dwarf.unit.add(array_type_id, gimli::DW_TAG_subrange_type);
+        let subrange_entry = self.dwarf.unit.get_mut(subrange_id);
+        subrange_entry.set(gimli::DW_AT_type, AttributeValue::UnitRef(self.array_size_type));
+        subrange_entry.set(gimli::DW_AT_lower_bound, AttributeValue::Udata(0));
+        subrange_entry.set(gimli::DW_AT_count, AttributeValue::Udata(len));
+
+        array_type_id
+    }
+
+    fn pointer_type<'tcx>(
+        &mut self,
+        tcx: TyCtxt<'tcx>,
+        type_dbg: &mut TypeDebugContext<'tcx>,
+        ptr_type: Ty<'tcx>,
+        pointee_type: Ty<'tcx>,
+    ) -> UnitEntryId {
+        let pointee_dw_ty = self.debug_type(tcx, type_dbg, pointee_type);
+
+        return_if_type_created_in_meantime!(type_dbg, ptr_type);
+
+        let name = type_names::compute_debuginfo_type_name(tcx, ptr_type, true);
+
+        if !has_ptr_meta(tcx, ptr_type) {
+            let pointer_type_id =
+                self.dwarf.unit.add(self.dwarf.unit.root(), gimli::DW_TAG_pointer_type);
+            let pointer_entry = self.dwarf.unit.get_mut(pointer_type_id);
+            pointer_entry.set(gimli::DW_AT_type, AttributeValue::UnitRef(pointee_dw_ty));
+            pointer_entry
+                .set(gimli::DW_AT_name, AttributeValue::StringRef(self.dwarf.strings.add(name)));
+
+            pointer_type_id
+        } else {
+            // FIXME implement debuginfo for fat pointers
+            self.placeholder_for_type(tcx, type_dbg, ptr_type)
+        }
+    }
+
+    fn placeholder_for_type<'tcx>(
+        &mut self,
+        tcx: TyCtxt<'tcx>,
+        type_dbg: &mut TypeDebugContext<'tcx>,
+        ty: Ty<'tcx>,
+    ) -> UnitEntryId {
+        self.debug_type(
+            tcx,
+            type_dbg,
+            Ty::new_array(
+                tcx,
+                tcx.types.u8,
+                tcx.layout_of(ty::ParamEnv::reveal_all().and(ty)).unwrap().size.bytes(),
+            ),
+        )
+    }
+}

src/debuginfo/unwind.rs

@@ -3,9 +3,10 @@
 use cranelift_codegen::ir::Endianness;
 use cranelift_codegen::isa::{unwind::UnwindInfo, TargetIsa};
 use cranelift_object::ObjectProduct;
-use gimli::write::{Address, CieId, EhFrame, FrameTable, Section};
+use gimli::write::{CieId, EhFrame, FrameTable, Section};
 use gimli::RunTimeEndian;
 
+use super::emit::address_for_func;
 use super::object::WriteDebugInfo;
 use crate::prelude::*;
 
@@ -47,11 +48,8 @@ impl UnwindContext {
 
         match unwind_info {
             UnwindInfo::SystemV(unwind_info) => {
-                self.frame_table.add_fde(
-                    self.cie_id.unwrap(),
-                    unwind_info
-                        .to_fde(Address::Symbol { symbol: func_id.as_u32() as usize, addend: 0 }),
-                );
+                self.frame_table
+                    .add_fde(self.cie_id.unwrap(), unwind_info.to_fde(address_for_func(func_id)));
             }
             UnwindInfo::WindowsX64(_) => {
                 // FIXME implement this

src/driver/aot.rs

@@ -23,6 +23,7 @@ use rustc_session::config::{DebugInfo, OutFileName, OutputFilenames, OutputType}
 use rustc_session::Session;
 
 use crate::concurrency_limiter::{ConcurrencyLimiter, ConcurrencyLimiterToken};
+use crate::debuginfo::TypeDebugContext;
 use crate::global_asm::GlobalAsmConfig;
 use crate::{prelude::*, BackendConfig};
 
@@ -460,6 +461,7 @@ fn module_codegen(
                 tcx.sess.opts.debuginfo != DebugInfo::None,
                 cgu_name,
             );
+            let mut type_dbg = TypeDebugContext::default();
             super::predefine_mono_items(tcx, &mut module, &mono_items);
             let mut codegened_functions = vec![];
             for (mono_item, _) in mono_items {
@@ -475,7 +477,10 @@ fn module_codegen(
                         codegened_functions.push(codegened_function);
                     }
                     MonoItem::Static(def_id) => {
-                        crate::constant::codegen_static(tcx, &mut module, def_id)
+                        let data_id = crate::constant::codegen_static(tcx, &mut module, def_id);
+                        if let Some(debug_context) = &mut cx.debug_context {
+                            debug_context.define_static(tcx, &mut type_dbg, def_id, data_id);
+                        }
                     }
                     MonoItem::GlobalAsm(item_id) => {
                         crate::global_asm::codegen_global_asm_item(