| use self::type_map::DINodeCreationResult; |
| use self::type_map::Stub; |
| use self::type_map::UniqueTypeId; |
| |
| use super::namespace::mangled_name_of_instance; |
| use super::type_names::{compute_debuginfo_type_name, compute_debuginfo_vtable_name}; |
| use super::utils::{ |
| create_DIArray, debug_context, get_namespace_for_item, is_node_local_to_unit, DIB, |
| }; |
| use super::CodegenUnitDebugContext; |
| |
| use crate::abi; |
| use crate::common::CodegenCx; |
| use crate::debuginfo::metadata::type_map::build_type_with_children; |
| use crate::debuginfo::utils::fat_pointer_kind; |
| use crate::debuginfo::utils::FatPtrKind; |
| use crate::llvm; |
| use crate::llvm::debuginfo::{ |
| DIDescriptor, DIFile, DIFlags, DILexicalBlock, DIScope, DIType, DebugEmissionKind, |
| }; |
| use crate::value::Value; |
| |
| use cstr::cstr; |
| use rustc_codegen_ssa::debuginfo::type_names::cpp_like_debuginfo; |
| use rustc_codegen_ssa::debuginfo::type_names::VTableNameKind; |
| use rustc_codegen_ssa::traits::*; |
| use rustc_fs_util::path_to_c_string; |
| use rustc_hir::def::CtorKind; |
| use rustc_hir::def_id::{DefId, LOCAL_CRATE}; |
| use rustc_middle::bug; |
| use rustc_middle::ty::layout::{LayoutOf, TyAndLayout}; |
| use rustc_middle::ty::{ |
| self, AdtKind, Instance, ParamEnv, PolyExistentialTraitRef, Ty, TyCtxt, Visibility, |
| }; |
| use rustc_session::config::{self, DebugInfo, Lto}; |
| use rustc_span::symbol::Symbol; |
| use rustc_span::FileName; |
| use rustc_span::{self, FileNameDisplayPreference, SourceFile}; |
| use rustc_symbol_mangling::typeid_for_trait_ref; |
| use rustc_target::abi::{Align, Size}; |
| use smallvec::smallvec; |
| |
| use libc::{c_char, c_longlong, c_uint}; |
| use std::borrow::Cow; |
| use std::fmt::{self, Write}; |
| use std::hash::{Hash, Hasher}; |
| use std::iter; |
| use std::path::{Path, PathBuf}; |
| use std::ptr; |
| |
| impl PartialEq for llvm::Metadata { |
| fn eq(&self, other: &Self) -> bool { |
| ptr::eq(self, other) |
| } |
| } |
| |
| impl Eq for llvm::Metadata {} |
| |
| impl Hash for llvm::Metadata { |
| fn hash<H: Hasher>(&self, hasher: &mut H) { |
| (self as *const Self).hash(hasher); |
| } |
| } |
| |
| impl fmt::Debug for llvm::Metadata { |
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
| (self as *const Self).fmt(f) |
| } |
| } |
| |
| // From DWARF 5. |
| // See http://www.dwarfstd.org/ShowIssue.php?issue=140129.1. |
| const DW_LANG_RUST: c_uint = 0x1c; |
| #[allow(non_upper_case_globals)] |
| const DW_ATE_boolean: c_uint = 0x02; |
| #[allow(non_upper_case_globals)] |
| const DW_ATE_float: c_uint = 0x04; |
| #[allow(non_upper_case_globals)] |
| const DW_ATE_signed: c_uint = 0x05; |
| #[allow(non_upper_case_globals)] |
| const DW_ATE_unsigned: c_uint = 0x07; |
| #[allow(non_upper_case_globals)] |
| const DW_ATE_UTF: c_uint = 0x10; |
| |
| pub(super) const UNKNOWN_LINE_NUMBER: c_uint = 0; |
| pub(super) const UNKNOWN_COLUMN_NUMBER: c_uint = 0; |
| |
| const NO_SCOPE_METADATA: Option<&DIScope> = None; |
| /// A function that returns an empty list of generic parameter debuginfo nodes. |
| const NO_GENERICS: for<'ll> fn(&CodegenCx<'ll, '_>) -> SmallVec<&'ll DIType> = |_| SmallVec::new(); |
| |
| // SmallVec is used quite a bit in this module, so create a shorthand. |
| // The actual number of elements is not so important. |
| pub type SmallVec<T> = smallvec::SmallVec<[T; 16]>; |
| |
| mod enums; |
| mod type_map; |
| |
| pub(crate) use type_map::TypeMap; |
| |
| /// 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_di_node_created_in_meantime { |
| ($cx: expr, $unique_type_id: expr) => { |
| if let Some(di_node) = debug_context($cx).type_map.di_node_for_unique_id($unique_type_id) { |
| return DINodeCreationResult::new(di_node, true); |
| } |
| }; |
| } |
| |
| /// Extract size and alignment from a TyAndLayout. |
| #[inline] |
| fn size_and_align_of(ty_and_layout: TyAndLayout<'_>) -> (Size, Align) { |
| (ty_and_layout.size, ty_and_layout.align.abi) |
| } |
| |
| /// Creates debuginfo for a fixed size array (e.g. `[u64; 123]`). |
| /// For slices (that is, "arrays" of unknown size) use [build_slice_type_di_node]. |
| fn build_fixed_size_array_di_node<'ll, 'tcx>( |
| cx: &CodegenCx<'ll, 'tcx>, |
| unique_type_id: UniqueTypeId<'tcx>, |
| array_type: Ty<'tcx>, |
| ) -> DINodeCreationResult<'ll> { |
| let ty::Array(element_type, len) = array_type.kind() else { |
| bug!("build_fixed_size_array_di_node() called with non-ty::Array type `{:?}`", array_type) |
| }; |
| |
| let element_type_di_node = type_di_node(cx, *element_type); |
| |
| return_if_di_node_created_in_meantime!(cx, unique_type_id); |
| |
| let (size, align) = cx.size_and_align_of(array_type); |
| |
| let upper_bound = len.eval_target_usize(cx.tcx, ty::ParamEnv::reveal_all()) as c_longlong; |
| |
| let subrange = |
| unsafe { Some(llvm::LLVMRustDIBuilderGetOrCreateSubrange(DIB(cx), 0, upper_bound)) }; |
| |
| let subscripts = create_DIArray(DIB(cx), &[subrange]); |
| let di_node = unsafe { |
| llvm::LLVMRustDIBuilderCreateArrayType( |
| DIB(cx), |
| size.bits(), |
| align.bits() as u32, |
| element_type_di_node, |
| subscripts, |
| ) |
| }; |
| |
| DINodeCreationResult::new(di_node, false) |
| } |
| |
| /// Creates debuginfo for built-in pointer-like things: |
| /// |
| /// - ty::Ref |
| /// - ty::RawPtr |
| /// - ty::Adt in the case it's Box |
| /// |
| /// At some point we might want to remove the special handling of Box |
| /// and treat it the same as other smart pointers (like Rc, Arc, ...). |
| fn build_pointer_or_reference_di_node<'ll, 'tcx>( |
| cx: &CodegenCx<'ll, 'tcx>, |
| ptr_type: Ty<'tcx>, |
| pointee_type: Ty<'tcx>, |
| unique_type_id: UniqueTypeId<'tcx>, |
| ) -> DINodeCreationResult<'ll> { |
| // The debuginfo generated by this function is only valid if `ptr_type` is really just |
| // a (fat) pointer. Make sure it is not called for e.g. `Box<T, NonZSTAllocator>`. |
| debug_assert_eq!( |
| cx.size_and_align_of(ptr_type), |
| cx.size_and_align_of(cx.tcx.mk_mut_ptr(pointee_type)) |
| ); |
| |
| let pointee_type_di_node = type_di_node(cx, pointee_type); |
| |
| return_if_di_node_created_in_meantime!(cx, unique_type_id); |
| |
| let data_layout = &cx.tcx.data_layout; |
| let ptr_type_debuginfo_name = compute_debuginfo_type_name(cx.tcx, ptr_type, true); |
| |
| match fat_pointer_kind(cx, pointee_type) { |
| None => { |
| // This is a thin pointer. Create a regular pointer type and give it the correct name. |
| debug_assert_eq!( |
| (data_layout.pointer_size, data_layout.pointer_align.abi), |
| cx.size_and_align_of(ptr_type), |
| "ptr_type={}, pointee_type={}", |
| ptr_type, |
| pointee_type, |
| ); |
| |
| let di_node = unsafe { |
| llvm::LLVMRustDIBuilderCreatePointerType( |
| DIB(cx), |
| pointee_type_di_node, |
| data_layout.pointer_size.bits(), |
| data_layout.pointer_align.abi.bits() as u32, |
| 0, // Ignore DWARF address space. |
| ptr_type_debuginfo_name.as_ptr().cast(), |
| ptr_type_debuginfo_name.len(), |
| ) |
| }; |
| |
| DINodeCreationResult { di_node, already_stored_in_typemap: false } |
| } |
| Some(fat_pointer_kind) => { |
| type_map::build_type_with_children( |
| cx, |
| type_map::stub( |
| cx, |
| Stub::Struct, |
| unique_type_id, |
| &ptr_type_debuginfo_name, |
| cx.size_and_align_of(ptr_type), |
| NO_SCOPE_METADATA, |
| DIFlags::FlagZero, |
| ), |
| |cx, owner| { |
| // FIXME: If this fat pointer is a `Box` then we don't want to use its |
| // type layout and instead use the layout of the raw pointer inside |
| // of it. |
| // The proper way to handle this is to not treat Box as a pointer |
| // at all and instead emit regular struct debuginfo for it. We just |
| // need to make sure that we don't break existing debuginfo consumers |
| // by doing that (at least not without a warning period). |
| let layout_type = |
| if ptr_type.is_box() { cx.tcx.mk_mut_ptr(pointee_type) } else { ptr_type }; |
| |
| let layout = cx.layout_of(layout_type); |
| let addr_field = layout.field(cx, abi::FAT_PTR_ADDR); |
| let extra_field = layout.field(cx, abi::FAT_PTR_EXTRA); |
| |
| let (addr_field_name, extra_field_name) = match fat_pointer_kind { |
| FatPtrKind::Dyn => ("pointer", "vtable"), |
| FatPtrKind::Slice => ("data_ptr", "length"), |
| }; |
| |
| debug_assert_eq!(abi::FAT_PTR_ADDR, 0); |
| debug_assert_eq!(abi::FAT_PTR_EXTRA, 1); |
| |
| // The data pointer type is a regular, thin pointer, regardless of whether this |
| // is a slice or a trait object. |
| let data_ptr_type_di_node = unsafe { |
| llvm::LLVMRustDIBuilderCreatePointerType( |
| DIB(cx), |
| pointee_type_di_node, |
| addr_field.size.bits(), |
| addr_field.align.abi.bits() as u32, |
| 0, // Ignore DWARF address space. |
| std::ptr::null(), |
| 0, |
| ) |
| }; |
| |
| smallvec![ |
| build_field_di_node( |
| cx, |
| owner, |
| addr_field_name, |
| (addr_field.size, addr_field.align.abi), |
| layout.fields.offset(abi::FAT_PTR_ADDR), |
| DIFlags::FlagZero, |
| data_ptr_type_di_node, |
| ), |
| build_field_di_node( |
| cx, |
| owner, |
| extra_field_name, |
| (extra_field.size, extra_field.align.abi), |
| layout.fields.offset(abi::FAT_PTR_EXTRA), |
| DIFlags::FlagZero, |
| type_di_node(cx, extra_field.ty), |
| ), |
| ] |
| }, |
| NO_GENERICS, |
| ) |
| } |
| } |
| } |
| |
| fn build_subroutine_type_di_node<'ll, 'tcx>( |
| cx: &CodegenCx<'ll, 'tcx>, |
| unique_type_id: UniqueTypeId<'tcx>, |
| ) -> DINodeCreationResult<'ll> { |
| // It's possible to create a self-referential |
| // type in Rust by using 'impl trait': |
| // |
| // fn foo() -> impl Copy { foo } |
| // |
| // Unfortunately LLVM's API does not allow us to create recursive subroutine types. |
| // In order to work around that restriction we place a marker type in the type map, |
| // before creating the actual type. If the actual type is recursive, it will hit the |
| // marker type. So we end up with a type that looks like |
| // |
| // fn foo() -> <recursive_type> |
| // |
| // Once that is created, we replace the marker in the typemap with the actual type. |
| debug_context(cx) |
| .type_map |
| .unique_id_to_di_node |
| .borrow_mut() |
| .insert(unique_type_id, recursion_marker_type_di_node(cx)); |
| |
| let fn_ty = unique_type_id.expect_ty(); |
| let signature = cx |
| .tcx |
| .normalize_erasing_late_bound_regions(ty::ParamEnv::reveal_all(), fn_ty.fn_sig(cx.tcx)); |
| |
| let signature_di_nodes: SmallVec<_> = iter::once( |
| // return type |
| match signature.output().kind() { |
| ty::Tuple(tys) if tys.is_empty() => { |
| // this is a "void" function |
| None |
| } |
| _ => Some(type_di_node(cx, signature.output())), |
| }, |
| ) |
| .chain( |
| // regular arguments |
| signature.inputs().iter().map(|&argument_type| Some(type_di_node(cx, argument_type))), |
| ) |
| .collect(); |
| |
| debug_context(cx).type_map.unique_id_to_di_node.borrow_mut().remove(&unique_type_id); |
| |
| let fn_di_node = unsafe { |
| llvm::LLVMRustDIBuilderCreateSubroutineType( |
| DIB(cx), |
| create_DIArray(DIB(cx), &signature_di_nodes[..]), |
| ) |
| }; |
| |
| // This is actually a function pointer, so wrap it in pointer DI. |
| let name = compute_debuginfo_type_name(cx.tcx, fn_ty, false); |
| let di_node = unsafe { |
| llvm::LLVMRustDIBuilderCreatePointerType( |
| DIB(cx), |
| fn_di_node, |
| cx.tcx.data_layout.pointer_size.bits(), |
| cx.tcx.data_layout.pointer_align.abi.bits() as u32, |
| 0, // Ignore DWARF address space. |
| name.as_ptr().cast(), |
| name.len(), |
| ) |
| }; |
| |
| DINodeCreationResult::new(di_node, false) |
| } |
| |
| /// Create debuginfo for `dyn SomeTrait` types. Currently these are empty structs |
| /// we with the correct type name (e.g. "dyn SomeTrait<Foo, Item=u32> + Sync"). |
| fn build_dyn_type_di_node<'ll, 'tcx>( |
| cx: &CodegenCx<'ll, 'tcx>, |
| dyn_type: Ty<'tcx>, |
| unique_type_id: UniqueTypeId<'tcx>, |
| ) -> DINodeCreationResult<'ll> { |
| if let ty::Dynamic(..) = dyn_type.kind() { |
| let type_name = compute_debuginfo_type_name(cx.tcx, dyn_type, true); |
| type_map::build_type_with_children( |
| cx, |
| type_map::stub( |
| cx, |
| Stub::Struct, |
| unique_type_id, |
| &type_name, |
| cx.size_and_align_of(dyn_type), |
| NO_SCOPE_METADATA, |
| DIFlags::FlagZero, |
| ), |
| |_, _| smallvec![], |
| NO_GENERICS, |
| ) |
| } else { |
| bug!( |
| "Only ty::Dynamic is valid for build_dyn_type_di_node(). Found {:?} instead.", |
| dyn_type |
| ) |
| } |
| } |
| |
| /// Create debuginfo for `[T]` and `str`. These are unsized. |
| /// |
| /// NOTE: We currently emit just emit the debuginfo for the element type here |
| /// (i.e. `T` for slices and `u8` for `str`), so that we end up with |
| /// `*const T` for the `data_ptr` field of the corresponding fat-pointer |
| /// debuginfo of `&[T]`. |
| /// |
| /// It would be preferable and more accurate if we emitted a DIArray of T |
| /// without an upper bound instead. That is, LLVM already supports emitting |
| /// debuginfo of arrays of unknown size. But GDB currently seems to end up |
| /// in an infinite loop when confronted with such a type. |
| /// |
| /// As a side effect of the current encoding every instance of a type like |
| /// `struct Foo { unsized_field: [u8] }` will look like |
| /// `struct Foo { unsized_field: u8 }` in debuginfo. If the length of the |
| /// slice is zero, then accessing `unsized_field` in the debugger would |
| /// result in an out-of-bounds access. |
| fn build_slice_type_di_node<'ll, 'tcx>( |
| cx: &CodegenCx<'ll, 'tcx>, |
| slice_type: Ty<'tcx>, |
| unique_type_id: UniqueTypeId<'tcx>, |
| ) -> DINodeCreationResult<'ll> { |
| let element_type = match slice_type.kind() { |
| ty::Slice(element_type) => *element_type, |
| ty::Str => cx.tcx.types.u8, |
| _ => { |
| bug!( |
| "Only ty::Slice is valid for build_slice_type_di_node(). Found {:?} instead.", |
| slice_type |
| ) |
| } |
| }; |
| |
| let element_type_di_node = type_di_node(cx, element_type); |
| return_if_di_node_created_in_meantime!(cx, unique_type_id); |
| DINodeCreationResult { di_node: element_type_di_node, already_stored_in_typemap: false } |
| } |
| |
| /// Get the debuginfo node for the given type. |
| /// |
| /// This function will look up the debuginfo node in the TypeMap. If it can't find it, it |
| /// will create the node by dispatching to the corresponding `build_*_di_node()` function. |
| pub fn type_di_node<'ll, 'tcx>(cx: &CodegenCx<'ll, 'tcx>, t: Ty<'tcx>) -> &'ll DIType { |
| let unique_type_id = UniqueTypeId::for_ty(cx.tcx, t); |
| |
| if let Some(existing_di_node) = debug_context(cx).type_map.di_node_for_unique_id(unique_type_id) |
| { |
| return existing_di_node; |
| } |
| |
| debug!("type_di_node: {:?}", t); |
| |
| let DINodeCreationResult { di_node, already_stored_in_typemap } = match *t.kind() { |
| ty::Never | ty::Bool | ty::Char | ty::Int(_) | ty::Uint(_) | ty::Float(_) => { |
| build_basic_type_di_node(cx, t) |
| } |
| ty::Tuple(elements) if elements.is_empty() => build_basic_type_di_node(cx, t), |
| ty::Array(..) => build_fixed_size_array_di_node(cx, unique_type_id, t), |
| ty::Slice(_) | ty::Str => build_slice_type_di_node(cx, t, unique_type_id), |
| ty::Dynamic(..) => build_dyn_type_di_node(cx, t, unique_type_id), |
| ty::Foreign(..) => build_foreign_type_di_node(cx, t, unique_type_id), |
| ty::RawPtr(ty::TypeAndMut { ty: pointee_type, .. }) | ty::Ref(_, pointee_type, _) => { |
| build_pointer_or_reference_di_node(cx, t, pointee_type, unique_type_id) |
| } |
| // Box<T, A> may have a non-ZST allocator A. In that case, we |
| // cannot treat Box<T, A> as just an owned alias of `*mut T`. |
| ty::Adt(def, substs) if def.is_box() && cx.layout_of(substs.type_at(1)).is_zst() => { |
| build_pointer_or_reference_di_node(cx, t, t.boxed_ty(), unique_type_id) |
| } |
| ty::FnDef(..) | ty::FnPtr(_) => build_subroutine_type_di_node(cx, unique_type_id), |
| ty::Closure(..) => build_closure_env_di_node(cx, unique_type_id), |
| ty::Generator(..) => enums::build_generator_di_node(cx, unique_type_id), |
| ty::Adt(def, ..) => match def.adt_kind() { |
| AdtKind::Struct => build_struct_type_di_node(cx, unique_type_id), |
| AdtKind::Union => build_union_type_di_node(cx, unique_type_id), |
| AdtKind::Enum => enums::build_enum_type_di_node(cx, unique_type_id), |
| }, |
| ty::Tuple(_) => build_tuple_type_di_node(cx, unique_type_id), |
| // Type parameters from polymorphized functions. |
| ty::Param(_) => build_param_type_di_node(cx, t), |
| _ => bug!("debuginfo: unexpected type in type_di_node(): {:?}", t), |
| }; |
| |
| { |
| if already_stored_in_typemap { |
| // Make sure that we really do have a `TypeMap` entry for the unique type ID. |
| let di_node_for_uid = |
| match debug_context(cx).type_map.di_node_for_unique_id(unique_type_id) { |
| Some(di_node) => di_node, |
| None => { |
| bug!( |
| "expected type debuginfo node for unique \ |
| type ID '{:?}' to already be in \ |
| the `debuginfo::TypeMap` but it \ |
| was not.", |
| unique_type_id, |
| ); |
| } |
| }; |
| |
| debug_assert_eq!(di_node_for_uid as *const _, di_node as *const _); |
| } else { |
| debug_context(cx).type_map.insert(unique_type_id, di_node); |
| } |
| } |
| |
| di_node |
| } |
| |
| // FIXME(mw): Cache this via a regular UniqueTypeId instead of an extra field in the debug context. |
| fn recursion_marker_type_di_node<'ll, 'tcx>(cx: &CodegenCx<'ll, 'tcx>) -> &'ll DIType { |
| *debug_context(cx).recursion_marker_type.get_or_init(move || { |
| unsafe { |
| // The choice of type here is pretty arbitrary - |
| // anything reading the debuginfo for a recursive |
| // type is going to see *something* weird - the only |
| // question is what exactly it will see. |
| // |
| // FIXME: the name `<recur_type>` does not fit the naming scheme |
| // of other types. |
| // |
| // FIXME: it might make sense to use an actual pointer type here |
| // so that debuggers can show the address. |
| let name = "<recur_type>"; |
| llvm::LLVMRustDIBuilderCreateBasicType( |
| DIB(cx), |
| name.as_ptr().cast(), |
| name.len(), |
| cx.tcx.data_layout.pointer_size.bits(), |
| DW_ATE_unsigned, |
| ) |
| } |
| }) |
| } |
| |
| fn hex_encode(data: &[u8]) -> String { |
| let mut hex_string = String::with_capacity(data.len() * 2); |
| for byte in data.iter() { |
| write!(&mut hex_string, "{:02x}", byte).unwrap(); |
| } |
| hex_string |
| } |
| |
| pub fn file_metadata<'ll>(cx: &CodegenCx<'ll, '_>, source_file: &SourceFile) -> &'ll DIFile { |
| let cache_key = Some((source_file.name_hash, source_file.src_hash)); |
| return debug_context(cx) |
| .created_files |
| .borrow_mut() |
| .entry(cache_key) |
| .or_insert_with(|| alloc_new_file_metadata(cx, source_file)); |
| |
| #[instrument(skip(cx, source_file), level = "debug")] |
| fn alloc_new_file_metadata<'ll>( |
| cx: &CodegenCx<'ll, '_>, |
| source_file: &SourceFile, |
| ) -> &'ll DIFile { |
| debug!(?source_file.name); |
| |
| let (directory, file_name) = match &source_file.name { |
| FileName::Real(filename) => { |
| let working_directory = &cx.sess().opts.working_dir; |
| debug!(?working_directory); |
| |
| let filename = cx |
| .sess() |
| .source_map() |
| .path_mapping() |
| .to_embeddable_absolute_path(filename.clone(), working_directory); |
| |
| // Construct the absolute path of the file |
| let abs_path = filename.remapped_path_if_available(); |
| debug!(?abs_path); |
| |
| if let Ok(rel_path) = |
| abs_path.strip_prefix(working_directory.remapped_path_if_available()) |
| { |
| // If the compiler's working directory (which also is the DW_AT_comp_dir of |
| // the compilation unit) is a prefix of the path we are about to emit, then |
| // only emit the part relative to the working directory. |
| // Because of path remapping we sometimes see strange things here: `abs_path` |
| // might actually look like a relative path |
| // (e.g. `<crate-name-and-version>/src/lib.rs`), so if we emit it without |
| // taking the working directory into account, downstream tooling will |
| // interpret it as `<working-directory>/<crate-name-and-version>/src/lib.rs`, |
| // which makes no sense. Usually in such cases the working directory will also |
| // be remapped to `<crate-name-and-version>` or some other prefix of the path |
| // we are remapping, so we end up with |
| // `<crate-name-and-version>/<crate-name-and-version>/src/lib.rs`. |
| // By moving the working directory portion into the `directory` part of the |
| // DIFile, we allow LLVM to emit just the relative path for DWARF, while |
| // still emitting the correct absolute path for CodeView. |
| ( |
| working_directory.to_string_lossy(FileNameDisplayPreference::Remapped), |
| rel_path.to_string_lossy().into_owned(), |
| ) |
| } else { |
| ("".into(), abs_path.to_string_lossy().into_owned()) |
| } |
| } |
| other => ("".into(), other.prefer_remapped().to_string_lossy().into_owned()), |
| }; |
| |
| let hash_kind = match source_file.src_hash.kind { |
| rustc_span::SourceFileHashAlgorithm::Md5 => llvm::ChecksumKind::MD5, |
| rustc_span::SourceFileHashAlgorithm::Sha1 => llvm::ChecksumKind::SHA1, |
| rustc_span::SourceFileHashAlgorithm::Sha256 => llvm::ChecksumKind::SHA256, |
| }; |
| let hash_value = hex_encode(source_file.src_hash.hash_bytes()); |
| |
| unsafe { |
| llvm::LLVMRustDIBuilderCreateFile( |
| DIB(cx), |
| file_name.as_ptr().cast(), |
| file_name.len(), |
| directory.as_ptr().cast(), |
| directory.len(), |
| hash_kind, |
| hash_value.as_ptr().cast(), |
| hash_value.len(), |
| ) |
| } |
| } |
| } |
| |
| pub fn unknown_file_metadata<'ll>(cx: &CodegenCx<'ll, '_>) -> &'ll DIFile { |
| debug_context(cx).created_files.borrow_mut().entry(None).or_insert_with(|| unsafe { |
| let file_name = "<unknown>"; |
| let directory = ""; |
| let hash_value = ""; |
| |
| llvm::LLVMRustDIBuilderCreateFile( |
| DIB(cx), |
| file_name.as_ptr().cast(), |
| file_name.len(), |
| directory.as_ptr().cast(), |
| directory.len(), |
| llvm::ChecksumKind::None, |
| hash_value.as_ptr().cast(), |
| hash_value.len(), |
| ) |
| }) |
| } |
| |
| trait MsvcBasicName { |
| fn msvc_basic_name(self) -> &'static str; |
| } |
| |
| impl MsvcBasicName for ty::IntTy { |
| fn msvc_basic_name(self) -> &'static str { |
| match self { |
| ty::IntTy::Isize => "ptrdiff_t", |
| ty::IntTy::I8 => "__int8", |
| ty::IntTy::I16 => "__int16", |
| ty::IntTy::I32 => "__int32", |
| ty::IntTy::I64 => "__int64", |
| ty::IntTy::I128 => "__int128", |
| } |
| } |
| } |
| |
| impl MsvcBasicName for ty::UintTy { |
| fn msvc_basic_name(self) -> &'static str { |
| match self { |
| ty::UintTy::Usize => "size_t", |
| ty::UintTy::U8 => "unsigned __int8", |
| ty::UintTy::U16 => "unsigned __int16", |
| ty::UintTy::U32 => "unsigned __int32", |
| ty::UintTy::U64 => "unsigned __int64", |
| ty::UintTy::U128 => "unsigned __int128", |
| } |
| } |
| } |
| |
| impl MsvcBasicName for ty::FloatTy { |
| fn msvc_basic_name(self) -> &'static str { |
| match self { |
| ty::FloatTy::F32 => "float", |
| ty::FloatTy::F64 => "double", |
| } |
| } |
| } |
| |
| fn build_basic_type_di_node<'ll, 'tcx>( |
| cx: &CodegenCx<'ll, 'tcx>, |
| t: Ty<'tcx>, |
| ) -> DINodeCreationResult<'ll> { |
| debug!("build_basic_type_di_node: {:?}", t); |
| |
| // When targeting MSVC, emit MSVC style type names for compatibility with |
| // .natvis visualizers (and perhaps other existing native debuggers?) |
| let cpp_like_debuginfo = cpp_like_debuginfo(cx.tcx); |
| |
| let (name, encoding) = match t.kind() { |
| ty::Never => ("!", DW_ATE_unsigned), |
| ty::Tuple(elements) if elements.is_empty() => { |
| if cpp_like_debuginfo { |
| return build_tuple_type_di_node(cx, UniqueTypeId::for_ty(cx.tcx, t)); |
| } else { |
| ("()", DW_ATE_unsigned) |
| } |
| } |
| ty::Bool => ("bool", DW_ATE_boolean), |
| ty::Char => ("char", DW_ATE_UTF), |
| ty::Int(int_ty) if cpp_like_debuginfo => (int_ty.msvc_basic_name(), DW_ATE_signed), |
| ty::Uint(uint_ty) if cpp_like_debuginfo => (uint_ty.msvc_basic_name(), DW_ATE_unsigned), |
| ty::Float(float_ty) if cpp_like_debuginfo => (float_ty.msvc_basic_name(), DW_ATE_float), |
| ty::Int(int_ty) => (int_ty.name_str(), DW_ATE_signed), |
| ty::Uint(uint_ty) => (uint_ty.name_str(), DW_ATE_unsigned), |
| ty::Float(float_ty) => (float_ty.name_str(), DW_ATE_float), |
| _ => bug!("debuginfo::build_basic_type_di_node - `t` is invalid type"), |
| }; |
| |
| let ty_di_node = unsafe { |
| llvm::LLVMRustDIBuilderCreateBasicType( |
| DIB(cx), |
| name.as_ptr().cast(), |
| name.len(), |
| cx.size_of(t).bits(), |
| encoding, |
| ) |
| }; |
| |
| if !cpp_like_debuginfo { |
| return DINodeCreationResult::new(ty_di_node, false); |
| } |
| |
| let typedef_name = match t.kind() { |
| ty::Int(int_ty) => int_ty.name_str(), |
| ty::Uint(uint_ty) => uint_ty.name_str(), |
| ty::Float(float_ty) => float_ty.name_str(), |
| _ => return DINodeCreationResult::new(ty_di_node, false), |
| }; |
| |
| let typedef_di_node = unsafe { |
| llvm::LLVMRustDIBuilderCreateTypedef( |
| DIB(cx), |
| ty_di_node, |
| typedef_name.as_ptr().cast(), |
| typedef_name.len(), |
| unknown_file_metadata(cx), |
| 0, |
| None, |
| ) |
| }; |
| |
| DINodeCreationResult::new(typedef_di_node, false) |
| } |
| |
| fn build_foreign_type_di_node<'ll, 'tcx>( |
| cx: &CodegenCx<'ll, 'tcx>, |
| t: Ty<'tcx>, |
| unique_type_id: UniqueTypeId<'tcx>, |
| ) -> DINodeCreationResult<'ll> { |
| debug!("build_foreign_type_di_node: {:?}", t); |
| |
| let &ty::Foreign(def_id) = unique_type_id.expect_ty().kind() else { |
| bug!("build_foreign_type_di_node() called with unexpected type: {:?}", unique_type_id.expect_ty()); |
| }; |
| |
| build_type_with_children( |
| cx, |
| type_map::stub( |
| cx, |
| Stub::Struct, |
| unique_type_id, |
| &compute_debuginfo_type_name(cx.tcx, t, false), |
| cx.size_and_align_of(t), |
| Some(get_namespace_for_item(cx, def_id)), |
| DIFlags::FlagZero, |
| ), |
| |_, _| smallvec![], |
| NO_GENERICS, |
| ) |
| } |
| |
| fn build_param_type_di_node<'ll, 'tcx>( |
| cx: &CodegenCx<'ll, 'tcx>, |
| t: Ty<'tcx>, |
| ) -> DINodeCreationResult<'ll> { |
| debug!("build_param_type_di_node: {:?}", t); |
| let name = format!("{:?}", t); |
| DINodeCreationResult { |
| di_node: unsafe { |
| llvm::LLVMRustDIBuilderCreateBasicType( |
| DIB(cx), |
| name.as_ptr().cast(), |
| name.len(), |
| Size::ZERO.bits(), |
| DW_ATE_unsigned, |
| ) |
| }, |
| already_stored_in_typemap: false, |
| } |
| } |
| |
| pub fn build_compile_unit_di_node<'ll, 'tcx>( |
| tcx: TyCtxt<'tcx>, |
| codegen_unit_name: &str, |
| debug_context: &CodegenUnitDebugContext<'ll, 'tcx>, |
| ) -> &'ll DIDescriptor { |
| let mut name_in_debuginfo = tcx |
| .sess |
| .local_crate_source_file() |
| .unwrap_or_else(|| PathBuf::from(tcx.crate_name(LOCAL_CRATE).as_str())); |
| |
| // To avoid breaking split DWARF, we need to ensure that each codegen unit |
| // has a unique `DW_AT_name`. This is because there's a remote chance that |
| // different codegen units for the same module will have entirely |
| // identical DWARF entries for the purpose of the DWO ID, which would |
| // violate Appendix F ("Split Dwarf Object Files") of the DWARF 5 |
| // specification. LLVM uses the algorithm specified in section 7.32 "Type |
| // Signature Computation" to compute the DWO ID, which does not include |
| // any fields that would distinguish compilation units. So we must embed |
| // the codegen unit name into the `DW_AT_name`. (Issue #88521.) |
| // |
| // Additionally, the OSX linker has an idiosyncrasy where it will ignore |
| // some debuginfo if multiple object files with the same `DW_AT_name` are |
| // linked together. |
| // |
| // As a workaround for these two issues, we generate unique names for each |
| // object file. Those do not correspond to an actual source file but that |
| // is harmless. |
| name_in_debuginfo.push("@"); |
| name_in_debuginfo.push(codegen_unit_name); |
| |
| debug!("build_compile_unit_di_node: {:?}", name_in_debuginfo); |
| let rustc_producer = format!("rustc version {}", tcx.sess.cfg_version); |
| // FIXME(#41252) Remove "clang LLVM" if we can get GDB and LLVM to play nice. |
| let producer = format!("clang LLVM ({})", rustc_producer); |
| |
| let name_in_debuginfo = name_in_debuginfo.to_string_lossy(); |
| let work_dir = tcx.sess.opts.working_dir.to_string_lossy(FileNameDisplayPreference::Remapped); |
| let flags = "\0"; |
| let output_filenames = tcx.output_filenames(()); |
| let split_name = if tcx.sess.target_can_use_split_dwarf() { |
| output_filenames |
| .split_dwarf_path( |
| tcx.sess.split_debuginfo(), |
| tcx.sess.opts.unstable_opts.split_dwarf_kind, |
| Some(codegen_unit_name), |
| ) |
| // We get a path relative to the working directory from split_dwarf_path |
| .map(|f| tcx.sess.source_map().path_mapping().map_prefix(f).0) |
| } else { |
| None |
| } |
| .unwrap_or_default(); |
| let split_name = split_name.to_str().unwrap(); |
| let kind = DebugEmissionKind::from_generic(tcx.sess.opts.debuginfo); |
| |
| unsafe { |
| let compile_unit_file = llvm::LLVMRustDIBuilderCreateFile( |
| debug_context.builder, |
| name_in_debuginfo.as_ptr().cast(), |
| name_in_debuginfo.len(), |
| work_dir.as_ptr().cast(), |
| work_dir.len(), |
| llvm::ChecksumKind::None, |
| ptr::null(), |
| 0, |
| ); |
| |
| let unit_metadata = llvm::LLVMRustDIBuilderCreateCompileUnit( |
| debug_context.builder, |
| DW_LANG_RUST, |
| compile_unit_file, |
| producer.as_ptr().cast(), |
| producer.len(), |
| tcx.sess.opts.optimize != config::OptLevel::No, |
| flags.as_ptr().cast(), |
| 0, |
| // NB: this doesn't actually have any perceptible effect, it seems. LLVM will instead |
| // put the path supplied to `MCSplitDwarfFile` into the debug info of the final |
| // output(s). |
| split_name.as_ptr().cast(), |
| split_name.len(), |
| kind, |
| 0, |
| tcx.sess.opts.unstable_opts.split_dwarf_inlining, |
| ); |
| |
| if tcx.sess.opts.unstable_opts.profile { |
| let default_gcda_path = &output_filenames.with_extension("gcda"); |
| let gcda_path = |
| tcx.sess.opts.unstable_opts.profile_emit.as_ref().unwrap_or(default_gcda_path); |
| |
| let gcov_cu_info = [ |
| path_to_mdstring(debug_context.llcontext, &output_filenames.with_extension("gcno")), |
| path_to_mdstring(debug_context.llcontext, gcda_path), |
| unit_metadata, |
| ]; |
| let gcov_metadata = llvm::LLVMMDNodeInContext2( |
| debug_context.llcontext, |
| gcov_cu_info.as_ptr(), |
| gcov_cu_info.len(), |
| ); |
| let val = llvm::LLVMMetadataAsValue(debug_context.llcontext, gcov_metadata); |
| |
| let llvm_gcov_ident = cstr!("llvm.gcov"); |
| llvm::LLVMAddNamedMetadataOperand(debug_context.llmod, llvm_gcov_ident.as_ptr(), val); |
| } |
| |
| // Insert `llvm.ident` metadata on the wasm targets since that will |
| // get hooked up to the "producer" sections `processed-by` information. |
| if tcx.sess.target.is_like_wasm { |
| let name_metadata = llvm::LLVMMDStringInContext( |
| debug_context.llcontext, |
| rustc_producer.as_ptr().cast(), |
| rustc_producer.as_bytes().len() as c_uint, |
| ); |
| llvm::LLVMAddNamedMetadataOperand( |
| debug_context.llmod, |
| cstr!("llvm.ident").as_ptr(), |
| llvm::LLVMMDNodeInContext(debug_context.llcontext, &name_metadata, 1), |
| ); |
| } |
| |
| return unit_metadata; |
| }; |
| |
| fn path_to_mdstring<'ll>(llcx: &'ll llvm::Context, path: &Path) -> &'ll llvm::Metadata { |
| let path_str = path_to_c_string(path); |
| unsafe { llvm::LLVMMDStringInContext2(llcx, path_str.as_ptr(), path_str.as_bytes().len()) } |
| } |
| } |
| |
| /// Creates a `DW_TAG_member` entry inside the DIE represented by the given `type_di_node`. |
| fn build_field_di_node<'ll, 'tcx>( |
| cx: &CodegenCx<'ll, 'tcx>, |
| owner: &'ll DIScope, |
| name: &str, |
| size_and_align: (Size, Align), |
| offset: Size, |
| flags: DIFlags, |
| type_di_node: &'ll DIType, |
| ) -> &'ll DIType { |
| unsafe { |
| llvm::LLVMRustDIBuilderCreateMemberType( |
| DIB(cx), |
| owner, |
| name.as_ptr().cast(), |
| name.len(), |
| unknown_file_metadata(cx), |
| UNKNOWN_LINE_NUMBER, |
| size_and_align.0.bits(), |
| size_and_align.1.bits() as u32, |
| offset.bits(), |
| flags, |
| type_di_node, |
| ) |
| } |
| } |
| |
| /// Creates the debuginfo node for a Rust struct type. Maybe be a regular struct or a tuple-struct. |
| fn build_struct_type_di_node<'ll, 'tcx>( |
| cx: &CodegenCx<'ll, 'tcx>, |
| unique_type_id: UniqueTypeId<'tcx>, |
| ) -> DINodeCreationResult<'ll> { |
| let struct_type = unique_type_id.expect_ty(); |
| let ty::Adt(adt_def, _) = struct_type.kind() else { |
| bug!("build_struct_type_di_node() called with non-struct-type: {:?}", struct_type); |
| }; |
| debug_assert!(adt_def.is_struct()); |
| let containing_scope = get_namespace_for_item(cx, adt_def.did()); |
| let struct_type_and_layout = cx.layout_of(struct_type); |
| let variant_def = adt_def.non_enum_variant(); |
| |
| type_map::build_type_with_children( |
| cx, |
| type_map::stub( |
| cx, |
| Stub::Struct, |
| unique_type_id, |
| &compute_debuginfo_type_name(cx.tcx, struct_type, false), |
| size_and_align_of(struct_type_and_layout), |
| Some(containing_scope), |
| DIFlags::FlagZero, |
| ), |
| // Fields: |
| |cx, owner| { |
| variant_def |
| .fields |
| .iter() |
| .enumerate() |
| .map(|(i, f)| { |
| let field_name = if variant_def.ctor_kind() == Some(CtorKind::Fn) { |
| // This is a tuple struct |
| tuple_field_name(i) |
| } else { |
| // This is struct with named fields |
| Cow::Borrowed(f.name.as_str()) |
| }; |
| let field_layout = struct_type_and_layout.field(cx, i); |
| build_field_di_node( |
| cx, |
| owner, |
| &field_name[..], |
| (field_layout.size, field_layout.align.abi), |
| struct_type_and_layout.fields.offset(i), |
| DIFlags::FlagZero, |
| type_di_node(cx, field_layout.ty), |
| ) |
| }) |
| .collect() |
| }, |
| |cx| build_generic_type_param_di_nodes(cx, struct_type), |
| ) |
| } |
| |
| //=----------------------------------------------------------------------------- |
| // Tuples |
| //=----------------------------------------------------------------------------- |
| |
| /// Builds the DW_TAG_member debuginfo nodes for the upvars of a closure or generator. |
| /// For a generator, this will handle upvars shared by all states. |
| fn build_upvar_field_di_nodes<'ll, 'tcx>( |
| cx: &CodegenCx<'ll, 'tcx>, |
| closure_or_generator_ty: Ty<'tcx>, |
| closure_or_generator_di_node: &'ll DIType, |
| ) -> SmallVec<&'ll DIType> { |
| let (&def_id, up_var_tys) = match closure_or_generator_ty.kind() { |
| ty::Generator(def_id, substs, _) => { |
| let upvar_tys: SmallVec<_> = substs.as_generator().prefix_tys().collect(); |
| (def_id, upvar_tys) |
| } |
| ty::Closure(def_id, substs) => { |
| let upvar_tys: SmallVec<_> = substs.as_closure().upvar_tys().collect(); |
| (def_id, upvar_tys) |
| } |
| _ => { |
| bug!( |
| "build_upvar_field_di_nodes() called with non-closure-or-generator-type: {:?}", |
| closure_or_generator_ty |
| ) |
| } |
| }; |
| |
| debug_assert!( |
| up_var_tys |
| .iter() |
| .all(|&t| t == cx.tcx.normalize_erasing_regions(ParamEnv::reveal_all(), t)) |
| ); |
| |
| let capture_names = cx.tcx.closure_saved_names_of_captured_variables(def_id); |
| let layout = cx.layout_of(closure_or_generator_ty); |
| |
| up_var_tys |
| .into_iter() |
| .zip(capture_names.iter()) |
| .enumerate() |
| .map(|(index, (up_var_ty, capture_name))| { |
| build_field_di_node( |
| cx, |
| closure_or_generator_di_node, |
| capture_name, |
| cx.size_and_align_of(up_var_ty), |
| layout.fields.offset(index), |
| DIFlags::FlagZero, |
| type_di_node(cx, up_var_ty), |
| ) |
| }) |
| .collect() |
| } |
| |
| /// Builds the DW_TAG_structure_type debuginfo node for a Rust tuple type. |
| fn build_tuple_type_di_node<'ll, 'tcx>( |
| cx: &CodegenCx<'ll, 'tcx>, |
| unique_type_id: UniqueTypeId<'tcx>, |
| ) -> DINodeCreationResult<'ll> { |
| let tuple_type = unique_type_id.expect_ty(); |
| let &ty::Tuple(component_types) = tuple_type.kind() else { |
| bug!("build_tuple_type_di_node() called with non-tuple-type: {:?}", tuple_type) |
| }; |
| |
| let tuple_type_and_layout = cx.layout_of(tuple_type); |
| let type_name = compute_debuginfo_type_name(cx.tcx, tuple_type, false); |
| |
| type_map::build_type_with_children( |
| cx, |
| type_map::stub( |
| cx, |
| Stub::Struct, |
| unique_type_id, |
| &type_name, |
| size_and_align_of(tuple_type_and_layout), |
| NO_SCOPE_METADATA, |
| DIFlags::FlagZero, |
| ), |
| // Fields: |
| |cx, tuple_di_node| { |
| component_types |
| .into_iter() |
| .enumerate() |
| .map(|(index, component_type)| { |
| build_field_di_node( |
| cx, |
| tuple_di_node, |
| &tuple_field_name(index), |
| cx.size_and_align_of(component_type), |
| tuple_type_and_layout.fields.offset(index), |
| DIFlags::FlagZero, |
| type_di_node(cx, component_type), |
| ) |
| }) |
| .collect() |
| }, |
| NO_GENERICS, |
| ) |
| } |
| |
| /// Builds the debuginfo node for a closure environment. |
| fn build_closure_env_di_node<'ll, 'tcx>( |
| cx: &CodegenCx<'ll, 'tcx>, |
| unique_type_id: UniqueTypeId<'tcx>, |
| ) -> DINodeCreationResult<'ll> { |
| let closure_env_type = unique_type_id.expect_ty(); |
| let &ty::Closure(def_id, _substs) = closure_env_type.kind() else { |
| bug!("build_closure_env_di_node() called with non-closure-type: {:?}", closure_env_type) |
| }; |
| let containing_scope = get_namespace_for_item(cx, def_id); |
| let type_name = compute_debuginfo_type_name(cx.tcx, closure_env_type, false); |
| |
| type_map::build_type_with_children( |
| cx, |
| type_map::stub( |
| cx, |
| Stub::Struct, |
| unique_type_id, |
| &type_name, |
| cx.size_and_align_of(closure_env_type), |
| Some(containing_scope), |
| DIFlags::FlagZero, |
| ), |
| // Fields: |
| |cx, owner| build_upvar_field_di_nodes(cx, closure_env_type, owner), |
| NO_GENERICS, |
| ) |
| } |
| |
| /// Build the debuginfo node for a Rust `union` type. |
| fn build_union_type_di_node<'ll, 'tcx>( |
| cx: &CodegenCx<'ll, 'tcx>, |
| unique_type_id: UniqueTypeId<'tcx>, |
| ) -> DINodeCreationResult<'ll> { |
| let union_type = unique_type_id.expect_ty(); |
| let (union_def_id, variant_def) = match union_type.kind() { |
| ty::Adt(def, _) => (def.did(), def.non_enum_variant()), |
| _ => bug!("build_union_type_di_node on a non-ADT"), |
| }; |
| let containing_scope = get_namespace_for_item(cx, union_def_id); |
| let union_ty_and_layout = cx.layout_of(union_type); |
| let type_name = compute_debuginfo_type_name(cx.tcx, union_type, false); |
| |
| type_map::build_type_with_children( |
| cx, |
| type_map::stub( |
| cx, |
| Stub::Union, |
| unique_type_id, |
| &type_name, |
| size_and_align_of(union_ty_and_layout), |
| Some(containing_scope), |
| DIFlags::FlagZero, |
| ), |
| // Fields: |
| |cx, owner| { |
| variant_def |
| .fields |
| .iter() |
| .enumerate() |
| .map(|(i, f)| { |
| let field_layout = union_ty_and_layout.field(cx, i); |
| build_field_di_node( |
| cx, |
| owner, |
| f.name.as_str(), |
| size_and_align_of(field_layout), |
| Size::ZERO, |
| DIFlags::FlagZero, |
| type_di_node(cx, field_layout.ty), |
| ) |
| }) |
| .collect() |
| }, |
| // Generics: |
| |cx| build_generic_type_param_di_nodes(cx, union_type), |
| ) |
| } |
| |
| /// Computes the type parameters for a type, if any, for the given metadata. |
| fn build_generic_type_param_di_nodes<'ll, 'tcx>( |
| cx: &CodegenCx<'ll, 'tcx>, |
| ty: Ty<'tcx>, |
| ) -> SmallVec<&'ll DIType> { |
| if let ty::Adt(def, substs) = *ty.kind() { |
| if substs.types().next().is_some() { |
| let generics = cx.tcx.generics_of(def.did()); |
| let names = get_parameter_names(cx, generics); |
| let template_params: SmallVec<_> = iter::zip(substs, names) |
| .filter_map(|(kind, name)| { |
| kind.as_type().map(|ty| { |
| let actual_type = |
| cx.tcx.normalize_erasing_regions(ParamEnv::reveal_all(), ty); |
| let actual_type_di_node = type_di_node(cx, actual_type); |
| let name = name.as_str(); |
| unsafe { |
| llvm::LLVMRustDIBuilderCreateTemplateTypeParameter( |
| DIB(cx), |
| None, |
| name.as_ptr().cast(), |
| name.len(), |
| actual_type_di_node, |
| ) |
| } |
| }) |
| }) |
| .collect(); |
| |
| return template_params; |
| } |
| } |
| |
| return smallvec![]; |
| |
| fn get_parameter_names(cx: &CodegenCx<'_, '_>, generics: &ty::Generics) -> Vec<Symbol> { |
| let mut names = generics |
| .parent |
| .map_or_else(Vec::new, |def_id| get_parameter_names(cx, cx.tcx.generics_of(def_id))); |
| names.extend(generics.params.iter().map(|param| param.name)); |
| names |
| } |
| } |
| |
| /// Creates debug information for the given global variable. |
| /// |
| /// Adds the created debuginfo nodes directly to the crate's IR. |
| pub fn build_global_var_di_node<'ll>(cx: &CodegenCx<'ll, '_>, def_id: DefId, global: &'ll Value) { |
| if cx.dbg_cx.is_none() { |
| return; |
| } |
| |
| // Only create type information if full debuginfo is enabled |
| if cx.sess().opts.debuginfo != DebugInfo::Full { |
| return; |
| } |
| |
| let tcx = cx.tcx; |
| |
| // We may want to remove the namespace scope if we're in an extern block (see |
| // https://github.com/rust-lang/rust/pull/46457#issuecomment-351750952). |
| let var_scope = get_namespace_for_item(cx, def_id); |
| let span = tcx.def_span(def_id); |
| |
| let (file_metadata, line_number) = if !span.is_dummy() { |
| let loc = cx.lookup_debug_loc(span.lo()); |
| (file_metadata(cx, &loc.file), loc.line) |
| } else { |
| (unknown_file_metadata(cx), UNKNOWN_LINE_NUMBER) |
| }; |
| |
| let is_local_to_unit = is_node_local_to_unit(cx, def_id); |
| let variable_type = Instance::mono(cx.tcx, def_id).ty(cx.tcx, ty::ParamEnv::reveal_all()); |
| let type_di_node = type_di_node(cx, variable_type); |
| let var_name = tcx.item_name(def_id); |
| let var_name = var_name.as_str(); |
| let linkage_name = mangled_name_of_instance(cx, Instance::mono(tcx, def_id)).name; |
| // When empty, linkage_name field is omitted, |
| // which is what we want for no_mangle statics |
| let linkage_name = if var_name == linkage_name { "" } else { linkage_name }; |
| |
| let global_align = cx.align_of(variable_type); |
| |
| unsafe { |
| llvm::LLVMRustDIBuilderCreateStaticVariable( |
| DIB(cx), |
| Some(var_scope), |
| var_name.as_ptr().cast(), |
| var_name.len(), |
| linkage_name.as_ptr().cast(), |
| linkage_name.len(), |
| file_metadata, |
| line_number, |
| type_di_node, |
| is_local_to_unit, |
| global, |
| None, |
| global_align.bits() as u32, |
| ); |
| } |
| } |
| |
| /// Generates LLVM debuginfo for a vtable. |
| /// |
| /// The vtable type looks like a struct with a field for each function pointer and super-trait |
| /// pointer it contains (plus the `size` and `align` fields). |
| /// |
| /// Except for `size`, `align`, and `drop_in_place`, the field names don't try to mirror |
| /// the name of the method they implement. This can be implemented in the future once there |
| /// is a proper disambiguation scheme for dealing with methods from different traits that have |
| /// the same name. |
| fn build_vtable_type_di_node<'ll, 'tcx>( |
| cx: &CodegenCx<'ll, 'tcx>, |
| ty: Ty<'tcx>, |
| poly_trait_ref: Option<ty::PolyExistentialTraitRef<'tcx>>, |
| ) -> &'ll DIType { |
| let tcx = cx.tcx; |
| |
| let vtable_entries = if let Some(poly_trait_ref) = poly_trait_ref { |
| let trait_ref = poly_trait_ref.with_self_ty(tcx, ty); |
| let trait_ref = tcx.erase_regions(trait_ref); |
| |
| tcx.vtable_entries(trait_ref) |
| } else { |
| TyCtxt::COMMON_VTABLE_ENTRIES |
| }; |
| |
| // All function pointers are described as opaque pointers. This could be improved in the future |
| // by describing them as actual function pointers. |
| let void_pointer_ty = tcx.mk_imm_ptr(tcx.types.unit); |
| let void_pointer_type_di_node = type_di_node(cx, void_pointer_ty); |
| let usize_di_node = type_di_node(cx, tcx.types.usize); |
| let (pointer_size, pointer_align) = cx.size_and_align_of(void_pointer_ty); |
| // If `usize` is not pointer-sized and -aligned then the size and alignment computations |
| // for the vtable as a whole would be wrong. Let's make sure this holds even on weird |
| // platforms. |
| assert_eq!(cx.size_and_align_of(tcx.types.usize), (pointer_size, pointer_align)); |
| |
| let vtable_type_name = |
| compute_debuginfo_vtable_name(cx.tcx, ty, poly_trait_ref, VTableNameKind::Type); |
| let unique_type_id = UniqueTypeId::for_vtable_ty(tcx, ty, poly_trait_ref); |
| let size = pointer_size * vtable_entries.len() as u64; |
| |
| // This gets mapped to a DW_AT_containing_type attribute which allows GDB to correlate |
| // the vtable to the type it is for. |
| let vtable_holder = type_di_node(cx, ty); |
| |
| build_type_with_children( |
| cx, |
| type_map::stub( |
| cx, |
| Stub::VTableTy { vtable_holder }, |
| unique_type_id, |
| &vtable_type_name, |
| (size, pointer_align), |
| NO_SCOPE_METADATA, |
| DIFlags::FlagArtificial, |
| ), |
| |cx, vtable_type_di_node| { |
| vtable_entries |
| .iter() |
| .enumerate() |
| .filter_map(|(index, vtable_entry)| { |
| let (field_name, field_type_di_node) = match vtable_entry { |
| ty::VtblEntry::MetadataDropInPlace => { |
| ("drop_in_place".to_string(), void_pointer_type_di_node) |
| } |
| ty::VtblEntry::Method(_) => { |
| // Note: This code does not try to give a proper name to each method |
| // because their might be multiple methods with the same name |
| // (coming from different traits). |
| (format!("__method{}", index), void_pointer_type_di_node) |
| } |
| ty::VtblEntry::TraitVPtr(_) => { |
| (format!("__super_trait_ptr{}", index), void_pointer_type_di_node) |
| } |
| ty::VtblEntry::MetadataAlign => ("align".to_string(), usize_di_node), |
| ty::VtblEntry::MetadataSize => ("size".to_string(), usize_di_node), |
| ty::VtblEntry::Vacant => return None, |
| }; |
| |
| let field_offset = pointer_size * index as u64; |
| |
| Some(build_field_di_node( |
| cx, |
| vtable_type_di_node, |
| &field_name, |
| (pointer_size, pointer_align), |
| field_offset, |
| DIFlags::FlagZero, |
| field_type_di_node, |
| )) |
| }) |
| .collect() |
| }, |
| NO_GENERICS, |
| ) |
| .di_node |
| } |
| |
| fn vcall_visibility_metadata<'ll, 'tcx>( |
| cx: &CodegenCx<'ll, 'tcx>, |
| ty: Ty<'tcx>, |
| trait_ref: Option<PolyExistentialTraitRef<'tcx>>, |
| vtable: &'ll Value, |
| ) { |
| enum VCallVisibility { |
| Public = 0, |
| LinkageUnit = 1, |
| TranslationUnit = 2, |
| } |
| |
| let Some(trait_ref) = trait_ref else { return }; |
| |
| let trait_ref_self = trait_ref.with_self_ty(cx.tcx, ty); |
| let trait_ref_self = cx.tcx.erase_regions(trait_ref_self); |
| let trait_def_id = trait_ref_self.def_id(); |
| let trait_vis = cx.tcx.visibility(trait_def_id); |
| |
| let cgus = cx.sess().codegen_units(); |
| let single_cgu = cgus == 1; |
| |
| let lto = cx.sess().lto(); |
| |
| // Since LLVM requires full LTO for the virtual function elimination optimization to apply, |
| // only the `Lto::Fat` cases are relevant currently. |
| let vcall_visibility = match (lto, trait_vis, single_cgu) { |
| // If there is not LTO and the visibility in public, we have to assume that the vtable can |
| // be seen from anywhere. With multiple CGUs, the vtable is quasi-public. |
| (Lto::No | Lto::ThinLocal, Visibility::Public, _) |
| | (Lto::No, Visibility::Restricted(_), false) => VCallVisibility::Public, |
| // With LTO and a quasi-public visibility, the usages of the functions of the vtable are |
| // all known by the `LinkageUnit`. |
| // FIXME: LLVM only supports this optimization for `Lto::Fat` currently. Once it also |
| // supports `Lto::Thin` the `VCallVisibility` may have to be adjusted for those. |
| (Lto::Fat | Lto::Thin, Visibility::Public, _) |
| | (Lto::ThinLocal | Lto::Thin | Lto::Fat, Visibility::Restricted(_), false) => { |
| VCallVisibility::LinkageUnit |
| } |
| // If there is only one CGU, private vtables can only be seen by that CGU/translation unit |
| // and therefore we know of all usages of functions in the vtable. |
| (_, Visibility::Restricted(_), true) => VCallVisibility::TranslationUnit, |
| }; |
| |
| let trait_ref_typeid = typeid_for_trait_ref(cx.tcx, trait_ref); |
| |
| unsafe { |
| let typeid = llvm::LLVMMDStringInContext( |
| cx.llcx, |
| trait_ref_typeid.as_ptr() as *const c_char, |
| trait_ref_typeid.as_bytes().len() as c_uint, |
| ); |
| let v = [cx.const_usize(0), typeid]; |
| llvm::LLVMRustGlobalAddMetadata( |
| vtable, |
| llvm::MD_type as c_uint, |
| llvm::LLVMValueAsMetadata(llvm::LLVMMDNodeInContext( |
| cx.llcx, |
| v.as_ptr(), |
| v.len() as c_uint, |
| )), |
| ); |
| let vcall_visibility = llvm::LLVMValueAsMetadata(cx.const_u64(vcall_visibility as u64)); |
| let vcall_visibility_metadata = llvm::LLVMMDNodeInContext2(cx.llcx, &vcall_visibility, 1); |
| llvm::LLVMGlobalSetMetadata( |
| vtable, |
| llvm::MetadataType::MD_vcall_visibility as c_uint, |
| vcall_visibility_metadata, |
| ); |
| } |
| } |
| |
| /// Creates debug information for the given vtable, which is for the |
| /// given type. |
| /// |
| /// Adds the created metadata nodes directly to the crate's IR. |
| pub fn create_vtable_di_node<'ll, 'tcx>( |
| cx: &CodegenCx<'ll, 'tcx>, |
| ty: Ty<'tcx>, |
| poly_trait_ref: Option<ty::PolyExistentialTraitRef<'tcx>>, |
| vtable: &'ll Value, |
| ) { |
| // FIXME(flip1995): The virtual function elimination optimization only works with full LTO in |
| // LLVM at the moment. |
| if cx.sess().opts.unstable_opts.virtual_function_elimination && cx.sess().lto() == Lto::Fat { |
| vcall_visibility_metadata(cx, ty, poly_trait_ref, vtable); |
| } |
| |
| if cx.dbg_cx.is_none() { |
| return; |
| } |
| |
| // Only create type information if full debuginfo is enabled |
| if cx.sess().opts.debuginfo != DebugInfo::Full { |
| return; |
| } |
| |
| // When full debuginfo is enabled, we want to try and prevent vtables from being |
| // merged. Otherwise debuggers will have a hard time mapping from dyn pointer |
| // to concrete type. |
| llvm::SetUnnamedAddress(vtable, llvm::UnnamedAddr::No); |
| |
| let vtable_name = |
| compute_debuginfo_vtable_name(cx.tcx, ty, poly_trait_ref, VTableNameKind::GlobalVariable); |
| let vtable_type_di_node = build_vtable_type_di_node(cx, ty, poly_trait_ref); |
| let linkage_name = ""; |
| |
| unsafe { |
| llvm::LLVMRustDIBuilderCreateStaticVariable( |
| DIB(cx), |
| NO_SCOPE_METADATA, |
| vtable_name.as_ptr().cast(), |
| vtable_name.len(), |
| linkage_name.as_ptr().cast(), |
| linkage_name.len(), |
| unknown_file_metadata(cx), |
| UNKNOWN_LINE_NUMBER, |
| vtable_type_di_node, |
| true, |
| vtable, |
| None, |
| 0, |
| ); |
| } |
| } |
| |
| /// Creates an "extension" of an existing `DIScope` into another file. |
| pub fn extend_scope_to_file<'ll>( |
| cx: &CodegenCx<'ll, '_>, |
| scope_metadata: &'ll DIScope, |
| file: &SourceFile, |
| ) -> &'ll DILexicalBlock { |
| let file_metadata = file_metadata(cx, file); |
| unsafe { llvm::LLVMRustDIBuilderCreateLexicalBlockFile(DIB(cx), scope_metadata, file_metadata) } |
| } |
| |
| pub fn tuple_field_name(field_index: usize) -> Cow<'static, str> { |
| const TUPLE_FIELD_NAMES: [&'static str; 16] = [ |
| "__0", "__1", "__2", "__3", "__4", "__5", "__6", "__7", "__8", "__9", "__10", "__11", |
| "__12", "__13", "__14", "__15", |
| ]; |
| TUPLE_FIELD_NAMES |
| .get(field_index) |
| .map(|s| Cow::from(*s)) |
| .unwrap_or_else(|| Cow::from(format!("__{}", field_index))) |
| } |
