2385 lines
87 KiB
Rust
2385 lines
87 KiB
Rust
use self::EnumDiscriminantInfo::*;
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use self::MemberDescriptionFactory::*;
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use self::RecursiveTypeDescription::*;
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use super::namespace::mangled_name_of_instance;
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use super::type_names::compute_debuginfo_type_name;
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use super::utils::{
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create_DIArray, debug_context, get_namespace_for_item, is_node_local_to_unit, span_start, DIB,
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};
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use super::CrateDebugContext;
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use crate::abi;
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use crate::common::CodegenCx;
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use crate::llvm;
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use crate::llvm::debuginfo::{
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DIArray, DICompositeType, DIDescriptor, DIFile, DIFlags, DILexicalBlock, DIScope, DIType,
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DebugEmissionKind,
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};
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use crate::llvm_util;
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use crate::value::Value;
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use log::debug;
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use rustc::ich::NodeIdHashingMode;
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use rustc::middle::codegen_fn_attrs::CodegenFnAttrFlags;
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use rustc::mir::interpret::truncate;
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use rustc::mir::{self, Field, GeneratorLayout};
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use rustc::session::config::{self, DebugInfo};
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use rustc::ty::layout::{
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self, Align, Integer, IntegerExt, LayoutOf, PrimitiveExt, Size, TyLayout, VariantIdx,
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};
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use rustc::ty::subst::{GenericArgKind, SubstsRef};
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use rustc::ty::Instance;
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use rustc::ty::{self, AdtKind, ParamEnv, Ty, TyCtxt};
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use rustc::{bug, span_bug};
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use rustc_codegen_ssa::traits::*;
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use rustc_data_structures::const_cstr;
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use rustc_data_structures::fingerprint::Fingerprint;
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use rustc_data_structures::fx::FxHashMap;
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use rustc_data_structures::small_c_str::SmallCStr;
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use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
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use rustc_fs_util::path_to_c_string;
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use rustc_hir::def::CtorKind;
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use rustc_hir::def_id::{CrateNum, DefId, LOCAL_CRATE};
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use rustc_index::vec::{Idx, IndexVec};
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use rustc_span::symbol::{Interner, Symbol};
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use rustc_span::{self, FileName, Span};
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use rustc_target::abi::HasDataLayout;
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use syntax::ast;
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use libc::{c_longlong, c_uint};
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use std::collections::hash_map::Entry;
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use std::ffi::CString;
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use std::fmt::{self, Write};
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use std::hash::{Hash, Hasher};
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use std::iter;
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use std::path::{Path, PathBuf};
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use std::ptr;
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impl PartialEq for llvm::Metadata {
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fn eq(&self, other: &Self) -> bool {
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ptr::eq(self, other)
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}
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}
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impl Eq for llvm::Metadata {}
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impl Hash for llvm::Metadata {
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fn hash<H: Hasher>(&self, hasher: &mut H) {
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(self as *const Self).hash(hasher);
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}
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}
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impl fmt::Debug for llvm::Metadata {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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(self as *const Self).fmt(f)
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}
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}
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// From DWARF 5.
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// See http://www.dwarfstd.org/ShowIssue.php?issue=140129.1.
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const DW_LANG_RUST: c_uint = 0x1c;
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#[allow(non_upper_case_globals)]
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const DW_ATE_boolean: c_uint = 0x02;
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#[allow(non_upper_case_globals)]
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const DW_ATE_float: c_uint = 0x04;
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#[allow(non_upper_case_globals)]
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const DW_ATE_signed: c_uint = 0x05;
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#[allow(non_upper_case_globals)]
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const DW_ATE_unsigned: c_uint = 0x07;
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#[allow(non_upper_case_globals)]
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const DW_ATE_unsigned_char: c_uint = 0x08;
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pub const UNKNOWN_LINE_NUMBER: c_uint = 0;
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pub const UNKNOWN_COLUMN_NUMBER: c_uint = 0;
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pub const NO_SCOPE_METADATA: Option<&DIScope> = None;
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#[derive(Copy, Debug, Hash, Eq, PartialEq, Clone)]
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pub struct UniqueTypeId(ast::Name);
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/// The `TypeMap` is where the `CrateDebugContext` holds the type metadata nodes
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/// created so far. The metadata nodes are indexed by `UniqueTypeId`, and, for
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/// faster lookup, also by `Ty`. The `TypeMap` is responsible for creating
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/// `UniqueTypeId`s.
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#[derive(Default)]
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pub struct TypeMap<'ll, 'tcx> {
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/// The `UniqueTypeId`s created so far.
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unique_id_interner: Interner,
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/// A map from `UniqueTypeId` to debuginfo metadata for that type. This is a 1:1 mapping.
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unique_id_to_metadata: FxHashMap<UniqueTypeId, &'ll DIType>,
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/// A map from types to debuginfo metadata. This is an N:1 mapping.
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type_to_metadata: FxHashMap<Ty<'tcx>, &'ll DIType>,
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/// A map from types to `UniqueTypeId`. This is an N:1 mapping.
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type_to_unique_id: FxHashMap<Ty<'tcx>, UniqueTypeId>,
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}
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impl TypeMap<'ll, 'tcx> {
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/// Adds a Ty to metadata mapping to the TypeMap. The method will fail if
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/// the mapping already exists.
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fn register_type_with_metadata(&mut self, type_: Ty<'tcx>, metadata: &'ll DIType) {
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if self.type_to_metadata.insert(type_, metadata).is_some() {
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bug!("type metadata for `Ty` '{}' is already in the `TypeMap`!", type_);
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}
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}
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/// Removes a `Ty`-to-metadata mapping.
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/// This is useful when computing the metadata for a potentially
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/// recursive type (e.g., a function pointer of the form:
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///
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/// fn foo() -> impl Copy { foo }
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///
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/// This kind of type cannot be properly represented
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/// via LLVM debuginfo. As a workaround,
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/// we register a temporary Ty to metadata mapping
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/// for the function before we compute its actual metadata.
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/// If the metadata computation ends up recursing back to the
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/// original function, it will use the temporary mapping
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/// for the inner self-reference, preventing us from
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/// recursing forever.
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///
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/// This function is used to remove the temporary metadata
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/// mapping after we've computed the actual metadata.
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fn remove_type(&mut self, type_: Ty<'tcx>) {
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if self.type_to_metadata.remove(type_).is_none() {
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bug!("type metadata `Ty` '{}' is not in the `TypeMap`!", type_);
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}
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}
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/// Adds a `UniqueTypeId` to metadata mapping to the `TypeMap`. The method will
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/// fail if the mapping already exists.
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fn register_unique_id_with_metadata(
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&mut self,
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unique_type_id: UniqueTypeId,
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metadata: &'ll DIType,
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) {
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if self.unique_id_to_metadata.insert(unique_type_id, metadata).is_some() {
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bug!(
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"type metadata for unique ID '{}' is already in the `TypeMap`!",
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self.get_unique_type_id_as_string(unique_type_id)
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);
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}
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}
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fn find_metadata_for_type(&self, type_: Ty<'tcx>) -> Option<&'ll DIType> {
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self.type_to_metadata.get(&type_).cloned()
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}
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fn find_metadata_for_unique_id(&self, unique_type_id: UniqueTypeId) -> Option<&'ll DIType> {
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self.unique_id_to_metadata.get(&unique_type_id).cloned()
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}
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/// Gets the string representation of a `UniqueTypeId`. This method will fail if
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/// the ID is unknown.
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fn get_unique_type_id_as_string(&self, unique_type_id: UniqueTypeId) -> &str {
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let UniqueTypeId(interner_key) = unique_type_id;
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self.unique_id_interner.get(interner_key)
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}
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/// Gets the `UniqueTypeId` for the given type. If the `UniqueTypeId` for the given
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/// type has been requested before, this is just a table lookup. Otherwise, an
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/// ID will be generated and stored for later lookup.
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fn get_unique_type_id_of_type<'a>(
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&mut self,
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cx: &CodegenCx<'a, 'tcx>,
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type_: Ty<'tcx>,
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) -> UniqueTypeId {
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// Let's see if we already have something in the cache.
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if let Some(unique_type_id) = self.type_to_unique_id.get(&type_).cloned() {
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return unique_type_id;
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}
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// If not, generate one.
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// The hasher we are using to generate the UniqueTypeId. We want
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// something that provides more than the 64 bits of the DefaultHasher.
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let mut hasher = StableHasher::new();
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let mut hcx = cx.tcx.create_stable_hashing_context();
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let type_ = cx.tcx.erase_regions(&type_);
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hcx.while_hashing_spans(false, |hcx| {
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hcx.with_node_id_hashing_mode(NodeIdHashingMode::HashDefPath, |hcx| {
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type_.hash_stable(hcx, &mut hasher);
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});
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});
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let unique_type_id = hasher.finish::<Fingerprint>().to_hex();
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let key = self.unique_id_interner.intern(&unique_type_id);
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self.type_to_unique_id.insert(type_, UniqueTypeId(key));
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return UniqueTypeId(key);
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}
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/// Gets the `UniqueTypeId` for an enum variant. Enum variants are not really
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/// types of their own, so they need special handling. We still need a
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/// `UniqueTypeId` for them, since to debuginfo they *are* real types.
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fn get_unique_type_id_of_enum_variant<'a>(
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&mut self,
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cx: &CodegenCx<'a, 'tcx>,
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enum_type: Ty<'tcx>,
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variant_name: &str,
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) -> UniqueTypeId {
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let enum_type_id = self.get_unique_type_id_of_type(cx, enum_type);
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let enum_variant_type_id =
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format!("{}::{}", self.get_unique_type_id_as_string(enum_type_id), variant_name);
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let interner_key = self.unique_id_interner.intern(&enum_variant_type_id);
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UniqueTypeId(interner_key)
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}
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/// Gets the unique type ID string for an enum variant part.
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/// Variant parts are not types and shouldn't really have their own ID,
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/// but it makes `set_members_of_composite_type()` simpler.
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fn get_unique_type_id_str_of_enum_variant_part(&mut self, enum_type_id: UniqueTypeId) -> &str {
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let variant_part_type_id =
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format!("{}_variant_part", self.get_unique_type_id_as_string(enum_type_id));
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let interner_key = self.unique_id_interner.intern(&variant_part_type_id);
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self.unique_id_interner.get(interner_key)
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}
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}
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/// A description of some recursive type. It can either be already finished (as
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/// with `FinalMetadata`) or it is not yet finished, but contains all information
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/// needed to generate the missing parts of the description. See the
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/// documentation section on Recursive Types at the top of this file for more
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/// information.
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enum RecursiveTypeDescription<'ll, 'tcx> {
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UnfinishedMetadata {
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unfinished_type: Ty<'tcx>,
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unique_type_id: UniqueTypeId,
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metadata_stub: &'ll DICompositeType,
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member_holding_stub: &'ll DICompositeType,
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member_description_factory: MemberDescriptionFactory<'ll, 'tcx>,
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},
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FinalMetadata(&'ll DICompositeType),
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}
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fn create_and_register_recursive_type_forward_declaration(
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cx: &CodegenCx<'ll, 'tcx>,
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unfinished_type: Ty<'tcx>,
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unique_type_id: UniqueTypeId,
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metadata_stub: &'ll DICompositeType,
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member_holding_stub: &'ll DICompositeType,
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member_description_factory: MemberDescriptionFactory<'ll, 'tcx>,
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) -> RecursiveTypeDescription<'ll, 'tcx> {
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// Insert the stub into the `TypeMap` in order to allow for recursive references.
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let mut type_map = debug_context(cx).type_map.borrow_mut();
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type_map.register_unique_id_with_metadata(unique_type_id, metadata_stub);
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type_map.register_type_with_metadata(unfinished_type, metadata_stub);
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UnfinishedMetadata {
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unfinished_type,
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unique_type_id,
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metadata_stub,
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member_holding_stub,
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member_description_factory,
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}
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}
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impl RecursiveTypeDescription<'ll, 'tcx> {
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/// Finishes up the description of the type in question (mostly by providing
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/// descriptions of the fields of the given type) and returns the final type
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/// metadata.
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fn finalize(&self, cx: &CodegenCx<'ll, 'tcx>) -> MetadataCreationResult<'ll> {
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match *self {
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FinalMetadata(metadata) => MetadataCreationResult::new(metadata, false),
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UnfinishedMetadata {
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unfinished_type,
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unique_type_id,
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metadata_stub,
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member_holding_stub,
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ref member_description_factory,
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} => {
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// Make sure that we have a forward declaration of the type in
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// the TypeMap so that recursive references are possible. This
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// will always be the case if the RecursiveTypeDescription has
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// been properly created through the
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// `create_and_register_recursive_type_forward_declaration()`
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// function.
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{
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let type_map = debug_context(cx).type_map.borrow();
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if type_map.find_metadata_for_unique_id(unique_type_id).is_none()
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|| type_map.find_metadata_for_type(unfinished_type).is_none()
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{
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bug!(
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"Forward declaration of potentially recursive type \
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'{:?}' was not found in TypeMap!",
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unfinished_type
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);
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}
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}
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// ... then create the member descriptions ...
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let member_descriptions = member_description_factory.create_member_descriptions(cx);
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// ... and attach them to the stub to complete it.
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set_members_of_composite_type(
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cx,
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unfinished_type,
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member_holding_stub,
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member_descriptions,
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);
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return MetadataCreationResult::new(metadata_stub, true);
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}
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}
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}
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}
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/// Returns from the enclosing function if the type metadata with the given
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/// unique ID can be found in the type map.
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macro_rules! return_if_metadata_created_in_meantime {
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($cx: expr, $unique_type_id: expr) => {
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if let Some(metadata) =
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debug_context($cx).type_map.borrow().find_metadata_for_unique_id($unique_type_id)
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{
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return MetadataCreationResult::new(metadata, true);
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}
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};
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}
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fn fixed_vec_metadata(
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cx: &CodegenCx<'ll, 'tcx>,
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unique_type_id: UniqueTypeId,
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array_or_slice_type: Ty<'tcx>,
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element_type: Ty<'tcx>,
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span: Span,
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) -> MetadataCreationResult<'ll> {
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let element_type_metadata = type_metadata(cx, element_type, span);
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return_if_metadata_created_in_meantime!(cx, unique_type_id);
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let (size, align) = cx.size_and_align_of(array_or_slice_type);
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let upper_bound = match array_or_slice_type.kind {
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ty::Array(_, len) => len.eval_usize(cx.tcx, ty::ParamEnv::reveal_all()) as c_longlong,
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_ => -1,
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};
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let subrange =
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unsafe { Some(llvm::LLVMRustDIBuilderGetOrCreateSubrange(DIB(cx), 0, upper_bound)) };
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let subscripts = create_DIArray(DIB(cx), &[subrange]);
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let metadata = unsafe {
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llvm::LLVMRustDIBuilderCreateArrayType(
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DIB(cx),
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size.bits(),
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align.bits() as u32,
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element_type_metadata,
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|
subscripts,
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)
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};
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return MetadataCreationResult::new(metadata, false);
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}
|
|
|
|
fn vec_slice_metadata(
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cx: &CodegenCx<'ll, 'tcx>,
|
|
slice_ptr_type: Ty<'tcx>,
|
|
element_type: Ty<'tcx>,
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unique_type_id: UniqueTypeId,
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|
span: Span,
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|
) -> MetadataCreationResult<'ll> {
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let data_ptr_type = cx.tcx.mk_imm_ptr(element_type);
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|
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let data_ptr_metadata = type_metadata(cx, data_ptr_type, span);
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|
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return_if_metadata_created_in_meantime!(cx, unique_type_id);
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|
|
|
let slice_type_name = compute_debuginfo_type_name(cx.tcx, slice_ptr_type, true);
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|
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|
let (pointer_size, pointer_align) = cx.size_and_align_of(data_ptr_type);
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let (usize_size, usize_align) = cx.size_and_align_of(cx.tcx.types.usize);
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|
|
|
let member_descriptions = vec![
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|
MemberDescription {
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|
name: "data_ptr".to_owned(),
|
|
type_metadata: data_ptr_metadata,
|
|
offset: Size::ZERO,
|
|
size: pointer_size,
|
|
align: pointer_align,
|
|
flags: DIFlags::FlagZero,
|
|
discriminant: None,
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|
},
|
|
MemberDescription {
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|
name: "length".to_owned(),
|
|
type_metadata: type_metadata(cx, cx.tcx.types.usize, span),
|
|
offset: pointer_size,
|
|
size: usize_size,
|
|
align: usize_align,
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|
flags: DIFlags::FlagZero,
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|
discriminant: None,
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|
},
|
|
];
|
|
|
|
let file_metadata = unknown_file_metadata(cx);
|
|
|
|
let metadata = composite_type_metadata(
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|
cx,
|
|
slice_ptr_type,
|
|
&slice_type_name[..],
|
|
unique_type_id,
|
|
member_descriptions,
|
|
NO_SCOPE_METADATA,
|
|
file_metadata,
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|
span,
|
|
);
|
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MetadataCreationResult::new(metadata, false)
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|
}
|
|
|
|
fn subroutine_type_metadata(
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cx: &CodegenCx<'ll, 'tcx>,
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|
unique_type_id: UniqueTypeId,
|
|
signature: ty::PolyFnSig<'tcx>,
|
|
span: Span,
|
|
) -> MetadataCreationResult<'ll> {
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|
let signature =
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cx.tcx.normalize_erasing_late_bound_regions(ty::ParamEnv::reveal_all(), &signature);
|
|
|
|
let signature_metadata: Vec<_> = iter::once(
|
|
// return type
|
|
match signature.output().kind {
|
|
ty::Tuple(ref tys) if tys.is_empty() => None,
|
|
_ => Some(type_metadata(cx, signature.output(), span)),
|
|
},
|
|
)
|
|
.chain(
|
|
// regular arguments
|
|
signature.inputs().iter().map(|argument_type| Some(type_metadata(cx, argument_type, span))),
|
|
)
|
|
.collect();
|
|
|
|
return_if_metadata_created_in_meantime!(cx, unique_type_id);
|
|
|
|
return MetadataCreationResult::new(
|
|
unsafe {
|
|
llvm::LLVMRustDIBuilderCreateSubroutineType(
|
|
DIB(cx),
|
|
unknown_file_metadata(cx),
|
|
create_DIArray(DIB(cx), &signature_metadata[..]),
|
|
)
|
|
},
|
|
false,
|
|
);
|
|
}
|
|
|
|
// FIXME(1563): This is all a bit of a hack because 'trait pointer' is an ill-
|
|
// defined concept. For the case of an actual trait pointer (i.e., `Box<Trait>`,
|
|
// `&Trait`), `trait_object_type` should be the whole thing (e.g, `Box<Trait>`) and
|
|
// `trait_type` should be the actual trait (e.g., `Trait`). Where the trait is part
|
|
// of a DST struct, there is no `trait_object_type` and the results of this
|
|
// function will be a little bit weird.
|
|
fn trait_pointer_metadata(
|
|
cx: &CodegenCx<'ll, 'tcx>,
|
|
trait_type: Ty<'tcx>,
|
|
trait_object_type: Option<Ty<'tcx>>,
|
|
unique_type_id: UniqueTypeId,
|
|
) -> &'ll DIType {
|
|
// The implementation provided here is a stub. It makes sure that the trait
|
|
// type is assigned the correct name, size, namespace, and source location.
|
|
// However, it does not describe the trait's methods.
|
|
|
|
let containing_scope = match trait_type.kind {
|
|
ty::Dynamic(ref data, ..) => {
|
|
data.principal_def_id().map(|did| get_namespace_for_item(cx, did))
|
|
}
|
|
_ => {
|
|
bug!(
|
|
"debuginfo: unexpected trait-object type in \
|
|
trait_pointer_metadata(): {:?}",
|
|
trait_type
|
|
);
|
|
}
|
|
};
|
|
|
|
let trait_object_type = trait_object_type.unwrap_or(trait_type);
|
|
let trait_type_name = compute_debuginfo_type_name(cx.tcx, trait_object_type, false);
|
|
|
|
let file_metadata = unknown_file_metadata(cx);
|
|
|
|
let layout = cx.layout_of(cx.tcx.mk_mut_ptr(trait_type));
|
|
|
|
assert_eq!(abi::FAT_PTR_ADDR, 0);
|
|
assert_eq!(abi::FAT_PTR_EXTRA, 1);
|
|
|
|
let data_ptr_field = layout.field(cx, 0);
|
|
let vtable_field = layout.field(cx, 1);
|
|
let member_descriptions = vec![
|
|
MemberDescription {
|
|
name: "pointer".to_owned(),
|
|
type_metadata: type_metadata(
|
|
cx,
|
|
cx.tcx.mk_mut_ptr(cx.tcx.types.u8),
|
|
rustc_span::DUMMY_SP,
|
|
),
|
|
offset: layout.fields.offset(0),
|
|
size: data_ptr_field.size,
|
|
align: data_ptr_field.align.abi,
|
|
flags: DIFlags::FlagArtificial,
|
|
discriminant: None,
|
|
},
|
|
MemberDescription {
|
|
name: "vtable".to_owned(),
|
|
type_metadata: type_metadata(cx, vtable_field.ty, rustc_span::DUMMY_SP),
|
|
offset: layout.fields.offset(1),
|
|
size: vtable_field.size,
|
|
align: vtable_field.align.abi,
|
|
flags: DIFlags::FlagArtificial,
|
|
discriminant: None,
|
|
},
|
|
];
|
|
|
|
composite_type_metadata(
|
|
cx,
|
|
trait_object_type,
|
|
&trait_type_name[..],
|
|
unique_type_id,
|
|
member_descriptions,
|
|
containing_scope,
|
|
file_metadata,
|
|
rustc_span::DUMMY_SP,
|
|
)
|
|
}
|
|
|
|
pub fn type_metadata(cx: &CodegenCx<'ll, 'tcx>, t: Ty<'tcx>, usage_site_span: Span) -> &'ll DIType {
|
|
// Get the unique type ID of this type.
|
|
let unique_type_id = {
|
|
let mut type_map = debug_context(cx).type_map.borrow_mut();
|
|
// First, try to find the type in `TypeMap`. If we have seen it before, we
|
|
// can exit early here.
|
|
match type_map.find_metadata_for_type(t) {
|
|
Some(metadata) => {
|
|
return metadata;
|
|
}
|
|
None => {
|
|
// The Ty is not in the `TypeMap` but maybe we have already seen
|
|
// an equivalent type (e.g., only differing in region arguments).
|
|
// In order to find out, generate the unique type ID and look
|
|
// that up.
|
|
let unique_type_id = type_map.get_unique_type_id_of_type(cx, t);
|
|
match type_map.find_metadata_for_unique_id(unique_type_id) {
|
|
Some(metadata) => {
|
|
// There is already an equivalent type in the TypeMap.
|
|
// Register this Ty as an alias in the cache and
|
|
// return the cached metadata.
|
|
type_map.register_type_with_metadata(t, metadata);
|
|
return metadata;
|
|
}
|
|
None => {
|
|
// There really is no type metadata for this type, so
|
|
// proceed by creating it.
|
|
unique_type_id
|
|
}
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
debug!("type_metadata: {:?}", t);
|
|
|
|
let ptr_metadata = |ty: Ty<'tcx>| match ty.kind {
|
|
ty::Slice(typ) => Ok(vec_slice_metadata(cx, t, typ, unique_type_id, usage_site_span)),
|
|
ty::Str => Ok(vec_slice_metadata(cx, t, cx.tcx.types.u8, unique_type_id, usage_site_span)),
|
|
ty::Dynamic(..) => Ok(MetadataCreationResult::new(
|
|
trait_pointer_metadata(cx, ty, Some(t), unique_type_id),
|
|
false,
|
|
)),
|
|
_ => {
|
|
let pointee_metadata = type_metadata(cx, ty, usage_site_span);
|
|
|
|
if let Some(metadata) =
|
|
debug_context(cx).type_map.borrow().find_metadata_for_unique_id(unique_type_id)
|
|
{
|
|
return Err(metadata);
|
|
}
|
|
|
|
Ok(MetadataCreationResult::new(pointer_type_metadata(cx, t, pointee_metadata), false))
|
|
}
|
|
};
|
|
|
|
let MetadataCreationResult { metadata, already_stored_in_typemap } = match t.kind {
|
|
ty::Never | ty::Bool | ty::Char | ty::Int(_) | ty::Uint(_) | ty::Float(_) => {
|
|
MetadataCreationResult::new(basic_type_metadata(cx, t), false)
|
|
}
|
|
ty::Tuple(ref elements) if elements.is_empty() => {
|
|
MetadataCreationResult::new(basic_type_metadata(cx, t), false)
|
|
}
|
|
ty::Array(typ, _) | ty::Slice(typ) => {
|
|
fixed_vec_metadata(cx, unique_type_id, t, typ, usage_site_span)
|
|
}
|
|
ty::Str => fixed_vec_metadata(cx, unique_type_id, t, cx.tcx.types.i8, usage_site_span),
|
|
ty::Dynamic(..) => {
|
|
MetadataCreationResult::new(trait_pointer_metadata(cx, t, None, unique_type_id), false)
|
|
}
|
|
ty::Foreign(..) => {
|
|
MetadataCreationResult::new(foreign_type_metadata(cx, t, unique_type_id), false)
|
|
}
|
|
ty::RawPtr(ty::TypeAndMut { ty, .. }) | ty::Ref(_, ty, _) => match ptr_metadata(ty) {
|
|
Ok(res) => res,
|
|
Err(metadata) => return metadata,
|
|
},
|
|
ty::Adt(def, _) if def.is_box() => match ptr_metadata(t.boxed_ty()) {
|
|
Ok(res) => res,
|
|
Err(metadata) => return metadata,
|
|
},
|
|
ty::FnDef(..) | ty::FnPtr(_) => {
|
|
if let Some(metadata) =
|
|
debug_context(cx).type_map.borrow().find_metadata_for_unique_id(unique_type_id)
|
|
{
|
|
return metadata;
|
|
}
|
|
|
|
// It's possible to create a self-referential
|
|
// type in Rust by using 'impl trait':
|
|
//
|
|
// fn foo() -> impl Copy { foo }
|
|
//
|
|
// See `TypeMap::remove_type` for more detals
|
|
// about the workaround.
|
|
|
|
let temp_type = {
|
|
unsafe {
|
|
// The choice of type here is pretty arbitrary -
|
|
// anything reading the debuginfo for a recursive
|
|
// type is going to see *somthing* weird - the only
|
|
// question is what exactly it will see.
|
|
let (size, align) = cx.size_and_align_of(t);
|
|
llvm::LLVMRustDIBuilderCreateBasicType(
|
|
DIB(cx),
|
|
SmallCStr::new("<recur_type>").as_ptr(),
|
|
size.bits(),
|
|
align.bits() as u32,
|
|
DW_ATE_unsigned,
|
|
)
|
|
}
|
|
};
|
|
|
|
let type_map = &debug_context(cx).type_map;
|
|
type_map.borrow_mut().register_type_with_metadata(t, temp_type);
|
|
|
|
let fn_metadata =
|
|
subroutine_type_metadata(cx, unique_type_id, t.fn_sig(cx.tcx), usage_site_span)
|
|
.metadata;
|
|
|
|
type_map.borrow_mut().remove_type(t);
|
|
|
|
// This is actually a function pointer, so wrap it in pointer DI.
|
|
MetadataCreationResult::new(pointer_type_metadata(cx, t, fn_metadata), false)
|
|
}
|
|
ty::Closure(def_id, substs) => {
|
|
let upvar_tys: Vec<_> = substs.as_closure().upvar_tys(def_id, cx.tcx).collect();
|
|
let containing_scope = get_namespace_for_item(cx, def_id);
|
|
prepare_tuple_metadata(
|
|
cx,
|
|
t,
|
|
&upvar_tys,
|
|
unique_type_id,
|
|
usage_site_span,
|
|
Some(containing_scope),
|
|
)
|
|
.finalize(cx)
|
|
}
|
|
ty::Generator(def_id, substs, _) => {
|
|
let upvar_tys: Vec<_> = substs
|
|
.as_generator()
|
|
.prefix_tys(def_id, cx.tcx)
|
|
.map(|t| cx.tcx.normalize_erasing_regions(ParamEnv::reveal_all(), t))
|
|
.collect();
|
|
prepare_enum_metadata(cx, t, def_id, unique_type_id, usage_site_span, upvar_tys)
|
|
.finalize(cx)
|
|
}
|
|
ty::Adt(def, ..) => match def.adt_kind() {
|
|
AdtKind::Struct => {
|
|
prepare_struct_metadata(cx, t, unique_type_id, usage_site_span).finalize(cx)
|
|
}
|
|
AdtKind::Union => {
|
|
prepare_union_metadata(cx, t, unique_type_id, usage_site_span).finalize(cx)
|
|
}
|
|
AdtKind::Enum => {
|
|
prepare_enum_metadata(cx, t, def.did, unique_type_id, usage_site_span, vec![])
|
|
.finalize(cx)
|
|
}
|
|
},
|
|
ty::Tuple(ref elements) => {
|
|
let tys: Vec<_> = elements.iter().map(|k| k.expect_ty()).collect();
|
|
prepare_tuple_metadata(cx, t, &tys, unique_type_id, usage_site_span, NO_SCOPE_METADATA)
|
|
.finalize(cx)
|
|
}
|
|
_ => bug!("debuginfo: unexpected type in type_metadata: {:?}", t),
|
|
};
|
|
|
|
{
|
|
let mut type_map = debug_context(cx).type_map.borrow_mut();
|
|
|
|
if already_stored_in_typemap {
|
|
// Also make sure that we already have a `TypeMap` entry for the unique type ID.
|
|
let metadata_for_uid = match type_map.find_metadata_for_unique_id(unique_type_id) {
|
|
Some(metadata) => metadata,
|
|
None => {
|
|
span_bug!(
|
|
usage_site_span,
|
|
"expected type metadata for unique \
|
|
type ID '{}' to already be in \
|
|
the `debuginfo::TypeMap` but it \
|
|
was not. (Ty = {})",
|
|
type_map.get_unique_type_id_as_string(unique_type_id),
|
|
t
|
|
);
|
|
}
|
|
};
|
|
|
|
match type_map.find_metadata_for_type(t) {
|
|
Some(metadata) => {
|
|
if metadata != metadata_for_uid {
|
|
span_bug!(
|
|
usage_site_span,
|
|
"mismatch between `Ty` and \
|
|
`UniqueTypeId` maps in \
|
|
`debuginfo::TypeMap`. \
|
|
UniqueTypeId={}, Ty={}",
|
|
type_map.get_unique_type_id_as_string(unique_type_id),
|
|
t
|
|
);
|
|
}
|
|
}
|
|
None => {
|
|
type_map.register_type_with_metadata(t, metadata);
|
|
}
|
|
}
|
|
} else {
|
|
type_map.register_type_with_metadata(t, metadata);
|
|
type_map.register_unique_id_with_metadata(unique_type_id, metadata);
|
|
}
|
|
}
|
|
|
|
metadata
|
|
}
|
|
|
|
pub fn file_metadata(
|
|
cx: &CodegenCx<'ll, '_>,
|
|
file_name: &FileName,
|
|
defining_crate: CrateNum,
|
|
) -> &'ll DIFile {
|
|
debug!("file_metadata: file_name: {}, defining_crate: {}", file_name, defining_crate);
|
|
|
|
let file_name = Some(file_name.to_string());
|
|
let directory = if defining_crate == LOCAL_CRATE {
|
|
Some(cx.sess().working_dir.0.to_string_lossy().to_string())
|
|
} else {
|
|
// If the path comes from an upstream crate we assume it has been made
|
|
// independent of the compiler's working directory one way or another.
|
|
None
|
|
};
|
|
file_metadata_raw(cx, file_name, directory)
|
|
}
|
|
|
|
pub fn unknown_file_metadata(cx: &CodegenCx<'ll, '_>) -> &'ll DIFile {
|
|
file_metadata_raw(cx, None, None)
|
|
}
|
|
|
|
fn file_metadata_raw(
|
|
cx: &CodegenCx<'ll, '_>,
|
|
file_name: Option<String>,
|
|
directory: Option<String>,
|
|
) -> &'ll DIFile {
|
|
let key = (file_name, directory);
|
|
|
|
match debug_context(cx).created_files.borrow_mut().entry(key) {
|
|
Entry::Occupied(o) => return o.get(),
|
|
Entry::Vacant(v) => {
|
|
let (file_name, directory) = v.key();
|
|
debug!("file_metadata: file_name: {:?}, directory: {:?}", file_name, directory);
|
|
|
|
let file_name = SmallCStr::new(if let Some(file_name) = file_name {
|
|
&file_name
|
|
} else {
|
|
"<unknown>"
|
|
});
|
|
let directory =
|
|
SmallCStr::new(if let Some(directory) = directory { &directory } else { "" });
|
|
|
|
let file_metadata = unsafe {
|
|
llvm::LLVMRustDIBuilderCreateFile(DIB(cx), file_name.as_ptr(), directory.as_ptr())
|
|
};
|
|
|
|
v.insert(file_metadata);
|
|
file_metadata
|
|
}
|
|
}
|
|
}
|
|
|
|
fn basic_type_metadata(cx: &CodegenCx<'ll, 'tcx>, t: Ty<'tcx>) -> &'ll DIType {
|
|
debug!("basic_type_metadata: {:?}", t);
|
|
|
|
let (name, encoding) = match t.kind {
|
|
ty::Never => ("!", DW_ATE_unsigned),
|
|
ty::Tuple(ref elements) if elements.is_empty() => ("()", DW_ATE_unsigned),
|
|
ty::Bool => ("bool", DW_ATE_boolean),
|
|
ty::Char => ("char", DW_ATE_unsigned_char),
|
|
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::basic_type_metadata - `t` is invalid type"),
|
|
};
|
|
|
|
let (size, align) = cx.size_and_align_of(t);
|
|
let name = SmallCStr::new(name);
|
|
let ty_metadata = unsafe {
|
|
llvm::LLVMRustDIBuilderCreateBasicType(
|
|
DIB(cx),
|
|
name.as_ptr(),
|
|
size.bits(),
|
|
align.bits() as u32,
|
|
encoding,
|
|
)
|
|
};
|
|
|
|
return ty_metadata;
|
|
}
|
|
|
|
fn foreign_type_metadata(
|
|
cx: &CodegenCx<'ll, 'tcx>,
|
|
t: Ty<'tcx>,
|
|
unique_type_id: UniqueTypeId,
|
|
) -> &'ll DIType {
|
|
debug!("foreign_type_metadata: {:?}", t);
|
|
|
|
let name = compute_debuginfo_type_name(cx.tcx, t, false);
|
|
create_struct_stub(cx, t, &name, unique_type_id, NO_SCOPE_METADATA)
|
|
}
|
|
|
|
fn pointer_type_metadata(
|
|
cx: &CodegenCx<'ll, 'tcx>,
|
|
pointer_type: Ty<'tcx>,
|
|
pointee_type_metadata: &'ll DIType,
|
|
) -> &'ll DIType {
|
|
let (pointer_size, pointer_align) = cx.size_and_align_of(pointer_type);
|
|
let name = compute_debuginfo_type_name(cx.tcx, pointer_type, false);
|
|
let name = SmallCStr::new(&name);
|
|
unsafe {
|
|
llvm::LLVMRustDIBuilderCreatePointerType(
|
|
DIB(cx),
|
|
pointee_type_metadata,
|
|
pointer_size.bits(),
|
|
pointer_align.bits() as u32,
|
|
name.as_ptr(),
|
|
)
|
|
}
|
|
}
|
|
|
|
pub fn compile_unit_metadata(
|
|
tcx: TyCtxt<'_>,
|
|
codegen_unit_name: &str,
|
|
debug_context: &CrateDebugContext<'ll, '_>,
|
|
) -> &'ll DIDescriptor {
|
|
let mut name_in_debuginfo = match tcx.sess.local_crate_source_file {
|
|
Some(ref path) => path.clone(),
|
|
None => PathBuf::from(&*tcx.crate_name(LOCAL_CRATE).as_str()),
|
|
};
|
|
|
|
// 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 we generate unique names for each object file. Those do
|
|
// not correspond to an actual source file but that should be harmless.
|
|
if tcx.sess.target.target.options.is_like_osx {
|
|
name_in_debuginfo.push("@");
|
|
name_in_debuginfo.push(codegen_unit_name);
|
|
}
|
|
|
|
debug!("compile_unit_metadata: {:?}", name_in_debuginfo);
|
|
let rustc_producer =
|
|
format!("rustc version {}", option_env!("CFG_VERSION").expect("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 name_in_debuginfo = SmallCStr::new(&name_in_debuginfo);
|
|
let work_dir = SmallCStr::new(&tcx.sess.working_dir.0.to_string_lossy());
|
|
let producer = CString::new(producer).unwrap();
|
|
let flags = "\0";
|
|
let split_name = "\0";
|
|
|
|
// FIXME(#60020):
|
|
//
|
|
// This should actually be
|
|
//
|
|
// let kind = DebugEmissionKind::from_generic(tcx.sess.opts.debuginfo);
|
|
//
|
|
// That is, we should set LLVM's emission kind to `LineTablesOnly` if
|
|
// we are compiling with "limited" debuginfo. However, some of the
|
|
// existing tools relied on slightly more debuginfo being generated than
|
|
// would be the case with `LineTablesOnly`, and we did not want to break
|
|
// these tools in a "drive-by fix", without a good idea or plan about
|
|
// what limited debuginfo should exactly look like. So for now we keep
|
|
// the emission kind as `FullDebug`.
|
|
//
|
|
// See https://github.com/rust-lang/rust/issues/60020 for details.
|
|
let kind = DebugEmissionKind::FullDebug;
|
|
assert!(tcx.sess.opts.debuginfo != DebugInfo::None);
|
|
|
|
unsafe {
|
|
let file_metadata = llvm::LLVMRustDIBuilderCreateFile(
|
|
debug_context.builder,
|
|
name_in_debuginfo.as_ptr(),
|
|
work_dir.as_ptr(),
|
|
);
|
|
|
|
let unit_metadata = llvm::LLVMRustDIBuilderCreateCompileUnit(
|
|
debug_context.builder,
|
|
DW_LANG_RUST,
|
|
file_metadata,
|
|
producer.as_ptr(),
|
|
tcx.sess.opts.optimize != config::OptLevel::No,
|
|
flags.as_ptr().cast(),
|
|
0,
|
|
split_name.as_ptr().cast(),
|
|
kind,
|
|
);
|
|
|
|
if tcx.sess.opts.debugging_opts.profile {
|
|
let cu_desc_metadata =
|
|
llvm::LLVMRustMetadataAsValue(debug_context.llcontext, unit_metadata);
|
|
|
|
let gcov_cu_info = [
|
|
path_to_mdstring(
|
|
debug_context.llcontext,
|
|
&tcx.output_filenames(LOCAL_CRATE).with_extension("gcno"),
|
|
),
|
|
path_to_mdstring(
|
|
debug_context.llcontext,
|
|
&tcx.output_filenames(LOCAL_CRATE).with_extension("gcda"),
|
|
),
|
|
cu_desc_metadata,
|
|
];
|
|
let gcov_metadata = llvm::LLVMMDNodeInContext(
|
|
debug_context.llcontext,
|
|
gcov_cu_info.as_ptr(),
|
|
gcov_cu_info.len() as c_uint,
|
|
);
|
|
|
|
let llvm_gcov_ident = const_cstr!("llvm.gcov");
|
|
llvm::LLVMAddNamedMetadataOperand(
|
|
debug_context.llmod,
|
|
llvm_gcov_ident.as_ptr(),
|
|
gcov_metadata,
|
|
);
|
|
}
|
|
|
|
// Insert `llvm.ident` metadata on the wasm32 targets since that will
|
|
// get hooked up to the "producer" sections `processed-by` information.
|
|
if tcx.sess.opts.target_triple.triple().starts_with("wasm32") {
|
|
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,
|
|
const_cstr!("llvm.ident").as_ptr(),
|
|
llvm::LLVMMDNodeInContext(debug_context.llcontext, &name_metadata, 1),
|
|
);
|
|
}
|
|
|
|
return unit_metadata;
|
|
};
|
|
|
|
fn path_to_mdstring(llcx: &'ll llvm::Context, path: &Path) -> &'ll Value {
|
|
let path_str = path_to_c_string(path);
|
|
unsafe {
|
|
llvm::LLVMMDStringInContext(
|
|
llcx,
|
|
path_str.as_ptr(),
|
|
path_str.as_bytes().len() as c_uint,
|
|
)
|
|
}
|
|
}
|
|
}
|
|
|
|
struct MetadataCreationResult<'ll> {
|
|
metadata: &'ll DIType,
|
|
already_stored_in_typemap: bool,
|
|
}
|
|
|
|
impl MetadataCreationResult<'ll> {
|
|
fn new(metadata: &'ll DIType, already_stored_in_typemap: bool) -> Self {
|
|
MetadataCreationResult { metadata, already_stored_in_typemap }
|
|
}
|
|
}
|
|
|
|
/// Description of a type member, which can either be a regular field (as in
|
|
/// structs or tuples) or an enum variant.
|
|
#[derive(Debug)]
|
|
struct MemberDescription<'ll> {
|
|
name: String,
|
|
type_metadata: &'ll DIType,
|
|
offset: Size,
|
|
size: Size,
|
|
align: Align,
|
|
flags: DIFlags,
|
|
discriminant: Option<u64>,
|
|
}
|
|
|
|
impl<'ll> MemberDescription<'ll> {
|
|
fn into_metadata(
|
|
self,
|
|
cx: &CodegenCx<'ll, '_>,
|
|
composite_type_metadata: &'ll DIScope,
|
|
) -> &'ll DIType {
|
|
let member_name = CString::new(self.name).unwrap();
|
|
unsafe {
|
|
llvm::LLVMRustDIBuilderCreateVariantMemberType(
|
|
DIB(cx),
|
|
composite_type_metadata,
|
|
member_name.as_ptr(),
|
|
unknown_file_metadata(cx),
|
|
UNKNOWN_LINE_NUMBER,
|
|
self.size.bits(),
|
|
self.align.bits() as u32,
|
|
self.offset.bits(),
|
|
match self.discriminant {
|
|
None => None,
|
|
Some(value) => Some(cx.const_u64(value)),
|
|
},
|
|
self.flags,
|
|
self.type_metadata,
|
|
)
|
|
}
|
|
}
|
|
}
|
|
|
|
/// A factory for `MemberDescription`s. It produces a list of member descriptions
|
|
/// for some record-like type. `MemberDescriptionFactory`s are used to defer the
|
|
/// creation of type member descriptions in order to break cycles arising from
|
|
/// recursive type definitions.
|
|
enum MemberDescriptionFactory<'ll, 'tcx> {
|
|
StructMDF(StructMemberDescriptionFactory<'tcx>),
|
|
TupleMDF(TupleMemberDescriptionFactory<'tcx>),
|
|
EnumMDF(EnumMemberDescriptionFactory<'ll, 'tcx>),
|
|
UnionMDF(UnionMemberDescriptionFactory<'tcx>),
|
|
VariantMDF(VariantMemberDescriptionFactory<'ll, 'tcx>),
|
|
}
|
|
|
|
impl MemberDescriptionFactory<'ll, 'tcx> {
|
|
fn create_member_descriptions(&self, cx: &CodegenCx<'ll, 'tcx>) -> Vec<MemberDescription<'ll>> {
|
|
match *self {
|
|
StructMDF(ref this) => this.create_member_descriptions(cx),
|
|
TupleMDF(ref this) => this.create_member_descriptions(cx),
|
|
EnumMDF(ref this) => this.create_member_descriptions(cx),
|
|
UnionMDF(ref this) => this.create_member_descriptions(cx),
|
|
VariantMDF(ref this) => this.create_member_descriptions(cx),
|
|
}
|
|
}
|
|
}
|
|
|
|
//=-----------------------------------------------------------------------------
|
|
// Structs
|
|
//=-----------------------------------------------------------------------------
|
|
|
|
/// Creates `MemberDescription`s for the fields of a struct.
|
|
struct StructMemberDescriptionFactory<'tcx> {
|
|
ty: Ty<'tcx>,
|
|
variant: &'tcx ty::VariantDef,
|
|
span: Span,
|
|
}
|
|
|
|
impl<'tcx> StructMemberDescriptionFactory<'tcx> {
|
|
fn create_member_descriptions(&self, cx: &CodegenCx<'ll, 'tcx>) -> Vec<MemberDescription<'ll>> {
|
|
let layout = cx.layout_of(self.ty);
|
|
self.variant
|
|
.fields
|
|
.iter()
|
|
.enumerate()
|
|
.map(|(i, f)| {
|
|
let name = if self.variant.ctor_kind == CtorKind::Fn {
|
|
format!("__{}", i)
|
|
} else {
|
|
f.ident.to_string()
|
|
};
|
|
let field = layout.field(cx, i);
|
|
MemberDescription {
|
|
name,
|
|
type_metadata: type_metadata(cx, field.ty, self.span),
|
|
offset: layout.fields.offset(i),
|
|
size: field.size,
|
|
align: field.align.abi,
|
|
flags: DIFlags::FlagZero,
|
|
discriminant: None,
|
|
}
|
|
})
|
|
.collect()
|
|
}
|
|
}
|
|
|
|
fn prepare_struct_metadata(
|
|
cx: &CodegenCx<'ll, 'tcx>,
|
|
struct_type: Ty<'tcx>,
|
|
unique_type_id: UniqueTypeId,
|
|
span: Span,
|
|
) -> RecursiveTypeDescription<'ll, 'tcx> {
|
|
let struct_name = compute_debuginfo_type_name(cx.tcx, struct_type, false);
|
|
|
|
let (struct_def_id, variant) = match struct_type.kind {
|
|
ty::Adt(def, _) => (def.did, def.non_enum_variant()),
|
|
_ => bug!("prepare_struct_metadata on a non-ADT"),
|
|
};
|
|
|
|
let containing_scope = get_namespace_for_item(cx, struct_def_id);
|
|
|
|
let struct_metadata_stub =
|
|
create_struct_stub(cx, struct_type, &struct_name, unique_type_id, Some(containing_scope));
|
|
|
|
create_and_register_recursive_type_forward_declaration(
|
|
cx,
|
|
struct_type,
|
|
unique_type_id,
|
|
struct_metadata_stub,
|
|
struct_metadata_stub,
|
|
StructMDF(StructMemberDescriptionFactory { ty: struct_type, variant, span }),
|
|
)
|
|
}
|
|
|
|
//=-----------------------------------------------------------------------------
|
|
// Tuples
|
|
//=-----------------------------------------------------------------------------
|
|
|
|
/// Creates `MemberDescription`s for the fields of a tuple.
|
|
struct TupleMemberDescriptionFactory<'tcx> {
|
|
ty: Ty<'tcx>,
|
|
component_types: Vec<Ty<'tcx>>,
|
|
span: Span,
|
|
}
|
|
|
|
impl<'tcx> TupleMemberDescriptionFactory<'tcx> {
|
|
fn create_member_descriptions(&self, cx: &CodegenCx<'ll, 'tcx>) -> Vec<MemberDescription<'ll>> {
|
|
let layout = cx.layout_of(self.ty);
|
|
self.component_types
|
|
.iter()
|
|
.enumerate()
|
|
.map(|(i, &component_type)| {
|
|
let (size, align) = cx.size_and_align_of(component_type);
|
|
MemberDescription {
|
|
name: format!("__{}", i),
|
|
type_metadata: type_metadata(cx, component_type, self.span),
|
|
offset: layout.fields.offset(i),
|
|
size,
|
|
align,
|
|
flags: DIFlags::FlagZero,
|
|
discriminant: None,
|
|
}
|
|
})
|
|
.collect()
|
|
}
|
|
}
|
|
|
|
fn prepare_tuple_metadata(
|
|
cx: &CodegenCx<'ll, 'tcx>,
|
|
tuple_type: Ty<'tcx>,
|
|
component_types: &[Ty<'tcx>],
|
|
unique_type_id: UniqueTypeId,
|
|
span: Span,
|
|
containing_scope: Option<&'ll DIScope>,
|
|
) -> RecursiveTypeDescription<'ll, 'tcx> {
|
|
let tuple_name = compute_debuginfo_type_name(cx.tcx, tuple_type, false);
|
|
|
|
let struct_stub =
|
|
create_struct_stub(cx, tuple_type, &tuple_name[..], unique_type_id, containing_scope);
|
|
|
|
create_and_register_recursive_type_forward_declaration(
|
|
cx,
|
|
tuple_type,
|
|
unique_type_id,
|
|
struct_stub,
|
|
struct_stub,
|
|
TupleMDF(TupleMemberDescriptionFactory {
|
|
ty: tuple_type,
|
|
component_types: component_types.to_vec(),
|
|
span,
|
|
}),
|
|
)
|
|
}
|
|
|
|
//=-----------------------------------------------------------------------------
|
|
// Unions
|
|
//=-----------------------------------------------------------------------------
|
|
|
|
struct UnionMemberDescriptionFactory<'tcx> {
|
|
layout: TyLayout<'tcx>,
|
|
variant: &'tcx ty::VariantDef,
|
|
span: Span,
|
|
}
|
|
|
|
impl<'tcx> UnionMemberDescriptionFactory<'tcx> {
|
|
fn create_member_descriptions(&self, cx: &CodegenCx<'ll, 'tcx>) -> Vec<MemberDescription<'ll>> {
|
|
self.variant
|
|
.fields
|
|
.iter()
|
|
.enumerate()
|
|
.map(|(i, f)| {
|
|
let field = self.layout.field(cx, i);
|
|
MemberDescription {
|
|
name: f.ident.to_string(),
|
|
type_metadata: type_metadata(cx, field.ty, self.span),
|
|
offset: Size::ZERO,
|
|
size: field.size,
|
|
align: field.align.abi,
|
|
flags: DIFlags::FlagZero,
|
|
discriminant: None,
|
|
}
|
|
})
|
|
.collect()
|
|
}
|
|
}
|
|
|
|
fn prepare_union_metadata(
|
|
cx: &CodegenCx<'ll, 'tcx>,
|
|
union_type: Ty<'tcx>,
|
|
unique_type_id: UniqueTypeId,
|
|
span: Span,
|
|
) -> RecursiveTypeDescription<'ll, 'tcx> {
|
|
let union_name = compute_debuginfo_type_name(cx.tcx, union_type, false);
|
|
|
|
let (union_def_id, variant) = match union_type.kind {
|
|
ty::Adt(def, _) => (def.did, def.non_enum_variant()),
|
|
_ => bug!("prepare_union_metadata on a non-ADT"),
|
|
};
|
|
|
|
let containing_scope = get_namespace_for_item(cx, union_def_id);
|
|
|
|
let union_metadata_stub =
|
|
create_union_stub(cx, union_type, &union_name, unique_type_id, containing_scope);
|
|
|
|
create_and_register_recursive_type_forward_declaration(
|
|
cx,
|
|
union_type,
|
|
unique_type_id,
|
|
union_metadata_stub,
|
|
union_metadata_stub,
|
|
UnionMDF(UnionMemberDescriptionFactory { layout: cx.layout_of(union_type), variant, span }),
|
|
)
|
|
}
|
|
|
|
//=-----------------------------------------------------------------------------
|
|
// Enums
|
|
//=-----------------------------------------------------------------------------
|
|
|
|
/// DWARF variant support is only available starting in LLVM 8.
|
|
/// Although the earlier enum debug info output did not work properly
|
|
/// in all situations, it is better for the time being to continue to
|
|
/// sometimes emit the old style rather than emit something completely
|
|
/// useless when rust is compiled against LLVM 6 or older. LLVM 7
|
|
/// contains an early version of the DWARF variant support, and will
|
|
/// crash when handling the new debug info format. This function
|
|
/// decides which representation will be emitted.
|
|
fn use_enum_fallback(cx: &CodegenCx<'_, '_>) -> bool {
|
|
// On MSVC we have to use the fallback mode, because LLVM doesn't
|
|
// lower variant parts to PDB.
|
|
return cx.sess().target.target.options.is_like_msvc
|
|
// LLVM version 7 did not release with an important bug fix;
|
|
// but the required patch is in the LLVM 8. Rust LLVM reports
|
|
// 8 as well.
|
|
|| llvm_util::get_major_version() < 8;
|
|
}
|
|
|
|
// FIXME(eddyb) maybe precompute this? Right now it's computed once
|
|
// per generator monomorphization, but it doesn't depend on substs.
|
|
fn generator_layout_and_saved_local_names(
|
|
tcx: TyCtxt<'tcx>,
|
|
def_id: DefId,
|
|
) -> (&'tcx GeneratorLayout<'tcx>, IndexVec<mir::GeneratorSavedLocal, Option<ast::Name>>) {
|
|
let body = tcx.optimized_mir(def_id);
|
|
let generator_layout = body.generator_layout.as_ref().unwrap();
|
|
let mut generator_saved_local_names = IndexVec::from_elem(None, &generator_layout.field_tys);
|
|
|
|
let state_arg = mir::Local::new(1);
|
|
for var in &body.var_debug_info {
|
|
if var.place.local != state_arg {
|
|
continue;
|
|
}
|
|
match var.place.projection[..] {
|
|
[
|
|
// Deref of the `Pin<&mut Self>` state argument.
|
|
mir::ProjectionElem::Field(..),
|
|
mir::ProjectionElem::Deref,
|
|
|
|
// Field of a variant of the state.
|
|
mir::ProjectionElem::Downcast(_, variant),
|
|
mir::ProjectionElem::Field(field, _),
|
|
] => {
|
|
let name = &mut generator_saved_local_names[
|
|
generator_layout.variant_fields[variant][field]
|
|
];
|
|
if name.is_none() {
|
|
name.replace(var.name);
|
|
}
|
|
}
|
|
_ => {}
|
|
}
|
|
}
|
|
(generator_layout, generator_saved_local_names)
|
|
}
|
|
|
|
/// Describes the members of an enum value; an enum is described as a union of
|
|
/// structs in DWARF. This `MemberDescriptionFactory` provides the description for
|
|
/// the members of this union; so for every variant of the given enum, this
|
|
/// factory will produce one `MemberDescription` (all with no name and a fixed
|
|
/// offset of zero bytes).
|
|
struct EnumMemberDescriptionFactory<'ll, 'tcx> {
|
|
enum_type: Ty<'tcx>,
|
|
layout: TyLayout<'tcx>,
|
|
discriminant_type_metadata: Option<&'ll DIType>,
|
|
containing_scope: &'ll DIScope,
|
|
span: Span,
|
|
}
|
|
|
|
impl EnumMemberDescriptionFactory<'ll, 'tcx> {
|
|
fn create_member_descriptions(&self, cx: &CodegenCx<'ll, 'tcx>) -> Vec<MemberDescription<'ll>> {
|
|
let generator_variant_info_data = match self.enum_type.kind {
|
|
ty::Generator(def_id, ..) => {
|
|
Some(generator_layout_and_saved_local_names(cx.tcx, def_id))
|
|
}
|
|
_ => None,
|
|
};
|
|
|
|
let variant_info_for = |index: VariantIdx| match self.enum_type.kind {
|
|
ty::Adt(adt, _) => VariantInfo::Adt(&adt.variants[index]),
|
|
ty::Generator(_, substs, _) => {
|
|
let (generator_layout, generator_saved_local_names) =
|
|
generator_variant_info_data.as_ref().unwrap();
|
|
VariantInfo::Generator {
|
|
substs,
|
|
generator_layout: *generator_layout,
|
|
generator_saved_local_names,
|
|
variant_index: index,
|
|
}
|
|
}
|
|
_ => bug!(),
|
|
};
|
|
|
|
// This will always find the metadata in the type map.
|
|
let fallback = use_enum_fallback(cx);
|
|
let self_metadata = if fallback {
|
|
self.containing_scope
|
|
} else {
|
|
type_metadata(cx, self.enum_type, self.span)
|
|
};
|
|
|
|
match self.layout.variants {
|
|
layout::Variants::Single { index } => {
|
|
if let ty::Adt(adt, _) = &self.enum_type.kind {
|
|
if adt.variants.is_empty() {
|
|
return vec![];
|
|
}
|
|
}
|
|
|
|
let variant_info = variant_info_for(index);
|
|
let (variant_type_metadata, member_description_factory) = describe_enum_variant(
|
|
cx,
|
|
self.layout,
|
|
variant_info,
|
|
NoDiscriminant,
|
|
self_metadata,
|
|
self.span,
|
|
);
|
|
|
|
let member_descriptions = member_description_factory.create_member_descriptions(cx);
|
|
|
|
set_members_of_composite_type(
|
|
cx,
|
|
self.enum_type,
|
|
variant_type_metadata,
|
|
member_descriptions,
|
|
);
|
|
vec![MemberDescription {
|
|
name: if fallback { String::new() } else { variant_info.variant_name() },
|
|
type_metadata: variant_type_metadata,
|
|
offset: Size::ZERO,
|
|
size: self.layout.size,
|
|
align: self.layout.align.abi,
|
|
flags: DIFlags::FlagZero,
|
|
discriminant: None,
|
|
}]
|
|
}
|
|
layout::Variants::Multiple {
|
|
discr_kind: layout::DiscriminantKind::Tag,
|
|
discr_index,
|
|
ref variants,
|
|
..
|
|
} => {
|
|
let discriminant_info = if fallback {
|
|
RegularDiscriminant {
|
|
discr_field: Field::from(discr_index),
|
|
discr_type_metadata: self.discriminant_type_metadata.unwrap(),
|
|
}
|
|
} else {
|
|
// This doesn't matter in this case.
|
|
NoDiscriminant
|
|
};
|
|
variants
|
|
.iter_enumerated()
|
|
.map(|(i, _)| {
|
|
let variant = self.layout.for_variant(cx, i);
|
|
let variant_info = variant_info_for(i);
|
|
let (variant_type_metadata, member_desc_factory) = describe_enum_variant(
|
|
cx,
|
|
variant,
|
|
variant_info,
|
|
discriminant_info,
|
|
self_metadata,
|
|
self.span,
|
|
);
|
|
|
|
let member_descriptions =
|
|
member_desc_factory.create_member_descriptions(cx);
|
|
|
|
set_members_of_composite_type(
|
|
cx,
|
|
self.enum_type,
|
|
variant_type_metadata,
|
|
member_descriptions,
|
|
);
|
|
|
|
MemberDescription {
|
|
name: if fallback {
|
|
String::new()
|
|
} else {
|
|
variant_info.variant_name()
|
|
},
|
|
type_metadata: variant_type_metadata,
|
|
offset: Size::ZERO,
|
|
size: self.layout.size,
|
|
align: self.layout.align.abi,
|
|
flags: DIFlags::FlagZero,
|
|
discriminant: Some(
|
|
self.layout.ty.discriminant_for_variant(cx.tcx, i).unwrap().val
|
|
as u64,
|
|
),
|
|
}
|
|
})
|
|
.collect()
|
|
}
|
|
layout::Variants::Multiple {
|
|
discr_kind:
|
|
layout::DiscriminantKind::Niche { ref niche_variants, niche_start, dataful_variant },
|
|
ref discr,
|
|
ref variants,
|
|
discr_index,
|
|
} => {
|
|
if fallback {
|
|
let variant = self.layout.for_variant(cx, dataful_variant);
|
|
// Create a description of the non-null variant.
|
|
let (variant_type_metadata, member_description_factory) = describe_enum_variant(
|
|
cx,
|
|
variant,
|
|
variant_info_for(dataful_variant),
|
|
OptimizedDiscriminant,
|
|
self.containing_scope,
|
|
self.span,
|
|
);
|
|
|
|
let variant_member_descriptions =
|
|
member_description_factory.create_member_descriptions(cx);
|
|
|
|
set_members_of_composite_type(
|
|
cx,
|
|
self.enum_type,
|
|
variant_type_metadata,
|
|
variant_member_descriptions,
|
|
);
|
|
|
|
// Encode the information about the null variant in the union
|
|
// member's name.
|
|
let mut name = String::from("RUST$ENCODED$ENUM$");
|
|
// Right now it's not even going to work for `niche_start > 0`,
|
|
// and for multiple niche variants it only supports the first.
|
|
fn compute_field_path<'a, 'tcx>(
|
|
cx: &CodegenCx<'a, 'tcx>,
|
|
name: &mut String,
|
|
layout: TyLayout<'tcx>,
|
|
offset: Size,
|
|
size: Size,
|
|
) {
|
|
for i in 0..layout.fields.count() {
|
|
let field_offset = layout.fields.offset(i);
|
|
if field_offset > offset {
|
|
continue;
|
|
}
|
|
let inner_offset = offset - field_offset;
|
|
let field = layout.field(cx, i);
|
|
if inner_offset + size <= field.size {
|
|
write!(name, "{}$", i).unwrap();
|
|
compute_field_path(cx, name, field, inner_offset, size);
|
|
}
|
|
}
|
|
}
|
|
compute_field_path(
|
|
cx,
|
|
&mut name,
|
|
self.layout,
|
|
self.layout.fields.offset(discr_index),
|
|
self.layout.field(cx, discr_index).size,
|
|
);
|
|
variant_info_for(*niche_variants.start()).map_struct_name(|variant_name| {
|
|
name.push_str(variant_name);
|
|
});
|
|
|
|
// Create the (singleton) list of descriptions of union members.
|
|
vec![MemberDescription {
|
|
name,
|
|
type_metadata: variant_type_metadata,
|
|
offset: Size::ZERO,
|
|
size: variant.size,
|
|
align: variant.align.abi,
|
|
flags: DIFlags::FlagZero,
|
|
discriminant: None,
|
|
}]
|
|
} else {
|
|
variants
|
|
.iter_enumerated()
|
|
.map(|(i, _)| {
|
|
let variant = self.layout.for_variant(cx, i);
|
|
let variant_info = variant_info_for(i);
|
|
let (variant_type_metadata, member_desc_factory) =
|
|
describe_enum_variant(
|
|
cx,
|
|
variant,
|
|
variant_info,
|
|
OptimizedDiscriminant,
|
|
self_metadata,
|
|
self.span,
|
|
);
|
|
|
|
let member_descriptions =
|
|
member_desc_factory.create_member_descriptions(cx);
|
|
|
|
set_members_of_composite_type(
|
|
cx,
|
|
self.enum_type,
|
|
variant_type_metadata,
|
|
member_descriptions,
|
|
);
|
|
|
|
let niche_value = if i == dataful_variant {
|
|
None
|
|
} else {
|
|
let value = (i.as_u32() as u128)
|
|
.wrapping_sub(niche_variants.start().as_u32() as u128)
|
|
.wrapping_add(niche_start);
|
|
let value = truncate(value, discr.value.size(cx));
|
|
// NOTE(eddyb) do *NOT* remove this assert, until
|
|
// we pass the full 128-bit value to LLVM, otherwise
|
|
// truncation will be silent and remain undetected.
|
|
assert_eq!(value as u64 as u128, value);
|
|
Some(value as u64)
|
|
};
|
|
|
|
MemberDescription {
|
|
name: variant_info.variant_name(),
|
|
type_metadata: variant_type_metadata,
|
|
offset: Size::ZERO,
|
|
size: self.layout.size,
|
|
align: self.layout.align.abi,
|
|
flags: DIFlags::FlagZero,
|
|
discriminant: niche_value,
|
|
}
|
|
})
|
|
.collect()
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Creates `MemberDescription`s for the fields of a single enum variant.
|
|
struct VariantMemberDescriptionFactory<'ll, 'tcx> {
|
|
/// Cloned from the `layout::Struct` describing the variant.
|
|
offsets: Vec<layout::Size>,
|
|
args: Vec<(String, Ty<'tcx>)>,
|
|
discriminant_type_metadata: Option<&'ll DIType>,
|
|
span: Span,
|
|
}
|
|
|
|
impl VariantMemberDescriptionFactory<'ll, 'tcx> {
|
|
fn create_member_descriptions(&self, cx: &CodegenCx<'ll, 'tcx>) -> Vec<MemberDescription<'ll>> {
|
|
self.args
|
|
.iter()
|
|
.enumerate()
|
|
.map(|(i, &(ref name, ty))| {
|
|
let (size, align) = cx.size_and_align_of(ty);
|
|
MemberDescription {
|
|
name: name.to_string(),
|
|
type_metadata: if use_enum_fallback(cx) {
|
|
match self.discriminant_type_metadata {
|
|
// Discriminant is always the first field of our variant
|
|
// when using the enum fallback.
|
|
Some(metadata) if i == 0 => metadata,
|
|
_ => type_metadata(cx, ty, self.span),
|
|
}
|
|
} else {
|
|
type_metadata(cx, ty, self.span)
|
|
},
|
|
offset: self.offsets[i],
|
|
size,
|
|
align,
|
|
flags: DIFlags::FlagZero,
|
|
discriminant: None,
|
|
}
|
|
})
|
|
.collect()
|
|
}
|
|
}
|
|
|
|
#[derive(Copy, Clone)]
|
|
enum EnumDiscriminantInfo<'ll> {
|
|
RegularDiscriminant { discr_field: Field, discr_type_metadata: &'ll DIType },
|
|
OptimizedDiscriminant,
|
|
NoDiscriminant,
|
|
}
|
|
|
|
#[derive(Copy, Clone)]
|
|
enum VariantInfo<'a, 'tcx> {
|
|
Adt(&'tcx ty::VariantDef),
|
|
Generator {
|
|
substs: SubstsRef<'tcx>,
|
|
generator_layout: &'tcx GeneratorLayout<'tcx>,
|
|
generator_saved_local_names: &'a IndexVec<mir::GeneratorSavedLocal, Option<ast::Name>>,
|
|
variant_index: VariantIdx,
|
|
},
|
|
}
|
|
|
|
impl<'tcx> VariantInfo<'_, 'tcx> {
|
|
fn map_struct_name<R>(&self, f: impl FnOnce(&str) -> R) -> R {
|
|
match self {
|
|
VariantInfo::Adt(variant) => f(&variant.ident.as_str()),
|
|
VariantInfo::Generator { substs, variant_index, .. } => {
|
|
f(&substs.as_generator().variant_name(*variant_index))
|
|
}
|
|
}
|
|
}
|
|
|
|
fn variant_name(&self) -> String {
|
|
match self {
|
|
VariantInfo::Adt(variant) => variant.ident.to_string(),
|
|
VariantInfo::Generator { variant_index, .. } => {
|
|
// Since GDB currently prints out the raw discriminant along
|
|
// with every variant, make each variant name be just the value
|
|
// of the discriminant. The struct name for the variant includes
|
|
// the actual variant description.
|
|
format!("{}", variant_index.as_usize())
|
|
}
|
|
}
|
|
}
|
|
|
|
fn field_name(&self, i: usize) -> String {
|
|
let field_name = match *self {
|
|
VariantInfo::Adt(variant) if variant.ctor_kind != CtorKind::Fn => {
|
|
Some(variant.fields[i].ident.name)
|
|
}
|
|
VariantInfo::Generator {
|
|
generator_layout,
|
|
generator_saved_local_names,
|
|
variant_index,
|
|
..
|
|
} => {
|
|
generator_saved_local_names
|
|
[generator_layout.variant_fields[variant_index][i.into()]]
|
|
}
|
|
_ => None,
|
|
};
|
|
field_name.map(|name| name.to_string()).unwrap_or_else(|| format!("__{}", i))
|
|
}
|
|
}
|
|
|
|
/// Returns a tuple of (1) `type_metadata_stub` of the variant, (2) a
|
|
/// `MemberDescriptionFactory` for producing the descriptions of the
|
|
/// fields of the variant. This is a rudimentary version of a full
|
|
/// `RecursiveTypeDescription`.
|
|
fn describe_enum_variant(
|
|
cx: &CodegenCx<'ll, 'tcx>,
|
|
layout: layout::TyLayout<'tcx>,
|
|
variant: VariantInfo<'_, 'tcx>,
|
|
discriminant_info: EnumDiscriminantInfo<'ll>,
|
|
containing_scope: &'ll DIScope,
|
|
span: Span,
|
|
) -> (&'ll DICompositeType, MemberDescriptionFactory<'ll, 'tcx>) {
|
|
let metadata_stub = variant.map_struct_name(|variant_name| {
|
|
let unique_type_id = debug_context(cx)
|
|
.type_map
|
|
.borrow_mut()
|
|
.get_unique_type_id_of_enum_variant(cx, layout.ty, &variant_name);
|
|
create_struct_stub(cx, layout.ty, &variant_name, unique_type_id, Some(containing_scope))
|
|
});
|
|
|
|
// Build an array of (field name, field type) pairs to be captured in the factory closure.
|
|
let (offsets, args) = if use_enum_fallback(cx) {
|
|
// If this is not a univariant enum, there is also the discriminant field.
|
|
let (discr_offset, discr_arg) = match discriminant_info {
|
|
RegularDiscriminant { discr_field, .. } => {
|
|
// We have the layout of an enum variant, we need the layout of the outer enum
|
|
let enum_layout = cx.layout_of(layout.ty);
|
|
let offset = enum_layout.fields.offset(discr_field.as_usize());
|
|
let args =
|
|
("RUST$ENUM$DISR".to_owned(), enum_layout.field(cx, discr_field.as_usize()).ty);
|
|
(Some(offset), Some(args))
|
|
}
|
|
_ => (None, None),
|
|
};
|
|
(
|
|
discr_offset
|
|
.into_iter()
|
|
.chain((0..layout.fields.count()).map(|i| layout.fields.offset(i)))
|
|
.collect(),
|
|
discr_arg
|
|
.into_iter()
|
|
.chain(
|
|
(0..layout.fields.count())
|
|
.map(|i| (variant.field_name(i), layout.field(cx, i).ty)),
|
|
)
|
|
.collect(),
|
|
)
|
|
} else {
|
|
(
|
|
(0..layout.fields.count()).map(|i| layout.fields.offset(i)).collect(),
|
|
(0..layout.fields.count())
|
|
.map(|i| (variant.field_name(i), layout.field(cx, i).ty))
|
|
.collect(),
|
|
)
|
|
};
|
|
|
|
let member_description_factory = VariantMDF(VariantMemberDescriptionFactory {
|
|
offsets,
|
|
args,
|
|
discriminant_type_metadata: match discriminant_info {
|
|
RegularDiscriminant { discr_type_metadata, .. } => Some(discr_type_metadata),
|
|
_ => None,
|
|
},
|
|
span,
|
|
});
|
|
|
|
(metadata_stub, member_description_factory)
|
|
}
|
|
|
|
fn prepare_enum_metadata(
|
|
cx: &CodegenCx<'ll, 'tcx>,
|
|
enum_type: Ty<'tcx>,
|
|
enum_def_id: DefId,
|
|
unique_type_id: UniqueTypeId,
|
|
span: Span,
|
|
outer_field_tys: Vec<Ty<'tcx>>,
|
|
) -> RecursiveTypeDescription<'ll, 'tcx> {
|
|
let enum_name = compute_debuginfo_type_name(cx.tcx, enum_type, false);
|
|
|
|
let containing_scope = get_namespace_for_item(cx, enum_def_id);
|
|
// FIXME: This should emit actual file metadata for the enum, but we
|
|
// currently can't get the necessary information when it comes to types
|
|
// imported from other crates. Formerly we violated the ODR when performing
|
|
// LTO because we emitted debuginfo for the same type with varying file
|
|
// metadata, so as a workaround we pretend that the type comes from
|
|
// <unknown>
|
|
let file_metadata = unknown_file_metadata(cx);
|
|
|
|
let discriminant_type_metadata = |discr: layout::Primitive| {
|
|
let enumerators_metadata: Vec<_> = match enum_type.kind {
|
|
ty::Adt(def, _) => def
|
|
.discriminants(cx.tcx)
|
|
.zip(&def.variants)
|
|
.map(|((_, discr), v)| {
|
|
let name = SmallCStr::new(&v.ident.as_str());
|
|
unsafe {
|
|
Some(llvm::LLVMRustDIBuilderCreateEnumerator(
|
|
DIB(cx),
|
|
name.as_ptr(),
|
|
// FIXME: what if enumeration has i128 discriminant?
|
|
discr.val as u64,
|
|
))
|
|
}
|
|
})
|
|
.collect(),
|
|
ty::Generator(_, substs, _) => substs
|
|
.as_generator()
|
|
.variant_range(enum_def_id, cx.tcx)
|
|
.map(|variant_index| {
|
|
let name = SmallCStr::new(&substs.as_generator().variant_name(variant_index));
|
|
unsafe {
|
|
Some(llvm::LLVMRustDIBuilderCreateEnumerator(
|
|
DIB(cx),
|
|
name.as_ptr(),
|
|
// FIXME: what if enumeration has i128 discriminant?
|
|
variant_index.as_usize() as u64,
|
|
))
|
|
}
|
|
})
|
|
.collect(),
|
|
_ => bug!(),
|
|
};
|
|
|
|
let disr_type_key = (enum_def_id, discr);
|
|
let cached_discriminant_type_metadata =
|
|
debug_context(cx).created_enum_disr_types.borrow().get(&disr_type_key).cloned();
|
|
match cached_discriminant_type_metadata {
|
|
Some(discriminant_type_metadata) => discriminant_type_metadata,
|
|
None => {
|
|
let (discriminant_size, discriminant_align) = (discr.size(cx), discr.align(cx));
|
|
let discriminant_base_type_metadata =
|
|
type_metadata(cx, discr.to_ty(cx.tcx), rustc_span::DUMMY_SP);
|
|
|
|
let discriminant_name = match enum_type.kind {
|
|
ty::Adt(..) => SmallCStr::new(&cx.tcx.item_name(enum_def_id).as_str()),
|
|
ty::Generator(..) => SmallCStr::new(&enum_name),
|
|
_ => bug!(),
|
|
};
|
|
|
|
let discriminant_type_metadata = unsafe {
|
|
llvm::LLVMRustDIBuilderCreateEnumerationType(
|
|
DIB(cx),
|
|
containing_scope,
|
|
discriminant_name.as_ptr(),
|
|
file_metadata,
|
|
UNKNOWN_LINE_NUMBER,
|
|
discriminant_size.bits(),
|
|
discriminant_align.abi.bits() as u32,
|
|
create_DIArray(DIB(cx), &enumerators_metadata),
|
|
discriminant_base_type_metadata,
|
|
true,
|
|
)
|
|
};
|
|
|
|
debug_context(cx)
|
|
.created_enum_disr_types
|
|
.borrow_mut()
|
|
.insert(disr_type_key, discriminant_type_metadata);
|
|
|
|
discriminant_type_metadata
|
|
}
|
|
}
|
|
};
|
|
|
|
let layout = cx.layout_of(enum_type);
|
|
|
|
match (&layout.abi, &layout.variants) {
|
|
(
|
|
&layout::Abi::Scalar(_),
|
|
&layout::Variants::Multiple {
|
|
discr_kind: layout::DiscriminantKind::Tag,
|
|
ref discr,
|
|
..
|
|
},
|
|
) => return FinalMetadata(discriminant_type_metadata(discr.value)),
|
|
_ => {}
|
|
}
|
|
|
|
let enum_name = SmallCStr::new(&enum_name);
|
|
let unique_type_id_str = SmallCStr::new(
|
|
debug_context(cx).type_map.borrow().get_unique_type_id_as_string(unique_type_id),
|
|
);
|
|
|
|
if use_enum_fallback(cx) {
|
|
let discriminant_type_metadata = match layout.variants {
|
|
layout::Variants::Single { .. }
|
|
| layout::Variants::Multiple {
|
|
discr_kind: layout::DiscriminantKind::Niche { .. },
|
|
..
|
|
} => None,
|
|
layout::Variants::Multiple {
|
|
discr_kind: layout::DiscriminantKind::Tag,
|
|
ref discr,
|
|
..
|
|
} => Some(discriminant_type_metadata(discr.value)),
|
|
};
|
|
|
|
let enum_metadata = unsafe {
|
|
llvm::LLVMRustDIBuilderCreateUnionType(
|
|
DIB(cx),
|
|
containing_scope,
|
|
enum_name.as_ptr(),
|
|
file_metadata,
|
|
UNKNOWN_LINE_NUMBER,
|
|
layout.size.bits(),
|
|
layout.align.abi.bits() as u32,
|
|
DIFlags::FlagZero,
|
|
None,
|
|
0, // RuntimeLang
|
|
unique_type_id_str.as_ptr(),
|
|
)
|
|
};
|
|
|
|
return create_and_register_recursive_type_forward_declaration(
|
|
cx,
|
|
enum_type,
|
|
unique_type_id,
|
|
enum_metadata,
|
|
enum_metadata,
|
|
EnumMDF(EnumMemberDescriptionFactory {
|
|
enum_type,
|
|
layout,
|
|
discriminant_type_metadata,
|
|
containing_scope,
|
|
span,
|
|
}),
|
|
);
|
|
}
|
|
|
|
let discriminator_name = match &enum_type.kind {
|
|
ty::Generator(..) => Some(SmallCStr::new(&"__state")),
|
|
_ => None,
|
|
};
|
|
let discriminator_name = discriminator_name.map(|n| n.as_ptr()).unwrap_or(ptr::null_mut());
|
|
let discriminator_metadata = match layout.variants {
|
|
// A single-variant enum has no discriminant.
|
|
layout::Variants::Single { .. } => None,
|
|
|
|
layout::Variants::Multiple {
|
|
discr_kind: layout::DiscriminantKind::Niche { .. },
|
|
ref discr,
|
|
discr_index,
|
|
..
|
|
} => {
|
|
// Find the integer type of the correct size.
|
|
let size = discr.value.size(cx);
|
|
let align = discr.value.align(cx);
|
|
|
|
let discr_type = match discr.value {
|
|
layout::Int(t, _) => t,
|
|
layout::F32 => Integer::I32,
|
|
layout::F64 => Integer::I64,
|
|
layout::Pointer => cx.data_layout().ptr_sized_integer(),
|
|
}
|
|
.to_ty(cx.tcx, false);
|
|
|
|
let discr_metadata = basic_type_metadata(cx, discr_type);
|
|
unsafe {
|
|
Some(llvm::LLVMRustDIBuilderCreateMemberType(
|
|
DIB(cx),
|
|
containing_scope,
|
|
discriminator_name,
|
|
file_metadata,
|
|
UNKNOWN_LINE_NUMBER,
|
|
size.bits(),
|
|
align.abi.bits() as u32,
|
|
layout.fields.offset(discr_index).bits(),
|
|
DIFlags::FlagArtificial,
|
|
discr_metadata,
|
|
))
|
|
}
|
|
}
|
|
|
|
layout::Variants::Multiple {
|
|
discr_kind: layout::DiscriminantKind::Tag,
|
|
ref discr,
|
|
discr_index,
|
|
..
|
|
} => {
|
|
let discr_type = discr.value.to_ty(cx.tcx);
|
|
let (size, align) = cx.size_and_align_of(discr_type);
|
|
|
|
let discr_metadata = basic_type_metadata(cx, discr_type);
|
|
unsafe {
|
|
Some(llvm::LLVMRustDIBuilderCreateMemberType(
|
|
DIB(cx),
|
|
containing_scope,
|
|
discriminator_name,
|
|
file_metadata,
|
|
UNKNOWN_LINE_NUMBER,
|
|
size.bits(),
|
|
align.bits() as u32,
|
|
layout.fields.offset(discr_index).bits(),
|
|
DIFlags::FlagArtificial,
|
|
discr_metadata,
|
|
))
|
|
}
|
|
}
|
|
};
|
|
|
|
let mut outer_fields = match layout.variants {
|
|
layout::Variants::Single { .. } => vec![],
|
|
layout::Variants::Multiple { .. } => {
|
|
let tuple_mdf = TupleMemberDescriptionFactory {
|
|
ty: enum_type,
|
|
component_types: outer_field_tys,
|
|
span,
|
|
};
|
|
tuple_mdf
|
|
.create_member_descriptions(cx)
|
|
.into_iter()
|
|
.map(|desc| Some(desc.into_metadata(cx, containing_scope)))
|
|
.collect()
|
|
}
|
|
};
|
|
|
|
let variant_part_unique_type_id_str = SmallCStr::new(
|
|
debug_context(cx)
|
|
.type_map
|
|
.borrow_mut()
|
|
.get_unique_type_id_str_of_enum_variant_part(unique_type_id),
|
|
);
|
|
let empty_array = create_DIArray(DIB(cx), &[]);
|
|
let variant_part = unsafe {
|
|
llvm::LLVMRustDIBuilderCreateVariantPart(
|
|
DIB(cx),
|
|
containing_scope,
|
|
ptr::null_mut(),
|
|
file_metadata,
|
|
UNKNOWN_LINE_NUMBER,
|
|
layout.size.bits(),
|
|
layout.align.abi.bits() as u32,
|
|
DIFlags::FlagZero,
|
|
discriminator_metadata,
|
|
empty_array,
|
|
variant_part_unique_type_id_str.as_ptr(),
|
|
)
|
|
};
|
|
outer_fields.push(Some(variant_part));
|
|
|
|
// The variant part must be wrapped in a struct according to DWARF.
|
|
let type_array = create_DIArray(DIB(cx), &outer_fields);
|
|
let struct_wrapper = unsafe {
|
|
llvm::LLVMRustDIBuilderCreateStructType(
|
|
DIB(cx),
|
|
Some(containing_scope),
|
|
enum_name.as_ptr(),
|
|
file_metadata,
|
|
UNKNOWN_LINE_NUMBER,
|
|
layout.size.bits(),
|
|
layout.align.abi.bits() as u32,
|
|
DIFlags::FlagZero,
|
|
None,
|
|
type_array,
|
|
0,
|
|
None,
|
|
unique_type_id_str.as_ptr(),
|
|
)
|
|
};
|
|
|
|
return create_and_register_recursive_type_forward_declaration(
|
|
cx,
|
|
enum_type,
|
|
unique_type_id,
|
|
struct_wrapper,
|
|
variant_part,
|
|
EnumMDF(EnumMemberDescriptionFactory {
|
|
enum_type,
|
|
layout,
|
|
discriminant_type_metadata: None,
|
|
containing_scope,
|
|
span,
|
|
}),
|
|
);
|
|
}
|
|
|
|
/// Creates debug information for a composite type, that is, anything that
|
|
/// results in a LLVM struct.
|
|
///
|
|
/// Examples of Rust types to use this are: structs, tuples, boxes, vecs, and enums.
|
|
fn composite_type_metadata(
|
|
cx: &CodegenCx<'ll, 'tcx>,
|
|
composite_type: Ty<'tcx>,
|
|
composite_type_name: &str,
|
|
composite_type_unique_id: UniqueTypeId,
|
|
member_descriptions: Vec<MemberDescription<'ll>>,
|
|
containing_scope: Option<&'ll DIScope>,
|
|
|
|
// Ignore source location information as long as it
|
|
// can't be reconstructed for non-local crates.
|
|
_file_metadata: &'ll DIFile,
|
|
_definition_span: Span,
|
|
) -> &'ll DICompositeType {
|
|
// Create the (empty) struct metadata node ...
|
|
let composite_type_metadata = create_struct_stub(
|
|
cx,
|
|
composite_type,
|
|
composite_type_name,
|
|
composite_type_unique_id,
|
|
containing_scope,
|
|
);
|
|
// ... and immediately create and add the member descriptions.
|
|
set_members_of_composite_type(cx, composite_type, composite_type_metadata, member_descriptions);
|
|
|
|
composite_type_metadata
|
|
}
|
|
|
|
fn set_members_of_composite_type(
|
|
cx: &CodegenCx<'ll, 'tcx>,
|
|
composite_type: Ty<'tcx>,
|
|
composite_type_metadata: &'ll DICompositeType,
|
|
member_descriptions: Vec<MemberDescription<'ll>>,
|
|
) {
|
|
// In some rare cases LLVM metadata uniquing would lead to an existing type
|
|
// description being used instead of a new one created in
|
|
// create_struct_stub. This would cause a hard to trace assertion in
|
|
// DICompositeType::SetTypeArray(). The following check makes sure that we
|
|
// get a better error message if this should happen again due to some
|
|
// regression.
|
|
{
|
|
let mut composite_types_completed =
|
|
debug_context(cx).composite_types_completed.borrow_mut();
|
|
if !composite_types_completed.insert(&composite_type_metadata) {
|
|
bug!(
|
|
"debuginfo::set_members_of_composite_type() - \
|
|
Already completed forward declaration re-encountered."
|
|
);
|
|
}
|
|
}
|
|
|
|
let member_metadata: Vec<_> = member_descriptions
|
|
.into_iter()
|
|
.map(|desc| Some(desc.into_metadata(cx, composite_type_metadata)))
|
|
.collect();
|
|
|
|
let type_params = compute_type_parameters(cx, composite_type);
|
|
unsafe {
|
|
let type_array = create_DIArray(DIB(cx), &member_metadata[..]);
|
|
llvm::LLVMRustDICompositeTypeReplaceArrays(
|
|
DIB(cx),
|
|
composite_type_metadata,
|
|
Some(type_array),
|
|
type_params,
|
|
);
|
|
}
|
|
}
|
|
|
|
/// Computes the type parameters for a type, if any, for the given metadata.
|
|
fn compute_type_parameters(cx: &CodegenCx<'ll, 'tcx>, ty: Ty<'tcx>) -> Option<&'ll DIArray> {
|
|
if let ty::Adt(def, substs) = ty.kind {
|
|
if !substs.types().next().is_none() {
|
|
let generics = cx.tcx.generics_of(def.did);
|
|
let names = get_parameter_names(cx, generics);
|
|
let template_params: Vec<_> = substs
|
|
.iter()
|
|
.zip(names)
|
|
.filter_map(|(kind, name)| {
|
|
if let GenericArgKind::Type(ty) = kind.unpack() {
|
|
let actual_type =
|
|
cx.tcx.normalize_erasing_regions(ParamEnv::reveal_all(), ty);
|
|
let actual_type_metadata =
|
|
type_metadata(cx, actual_type, rustc_span::DUMMY_SP);
|
|
let name = SmallCStr::new(&name.as_str());
|
|
Some(unsafe {
|
|
Some(llvm::LLVMRustDIBuilderCreateTemplateTypeParameter(
|
|
DIB(cx),
|
|
None,
|
|
name.as_ptr(),
|
|
actual_type_metadata,
|
|
unknown_file_metadata(cx),
|
|
0,
|
|
0,
|
|
))
|
|
})
|
|
} else {
|
|
None
|
|
}
|
|
})
|
|
.collect();
|
|
|
|
return Some(create_DIArray(DIB(cx), &template_params[..]));
|
|
}
|
|
}
|
|
return Some(create_DIArray(DIB(cx), &[]));
|
|
|
|
fn get_parameter_names(cx: &CodegenCx<'_, '_>, generics: &ty::Generics) -> Vec<Symbol> {
|
|
let mut names = generics
|
|
.parent
|
|
.map_or(vec![], |def_id| get_parameter_names(cx, cx.tcx.generics_of(def_id)));
|
|
names.extend(generics.params.iter().map(|param| param.name));
|
|
names
|
|
}
|
|
}
|
|
|
|
/// A convenience wrapper around `LLVMRustDIBuilderCreateStructType()`. Does not do
|
|
/// any caching, does not add any fields to the struct. This can be done later
|
|
/// with `set_members_of_composite_type()`.
|
|
fn create_struct_stub(
|
|
cx: &CodegenCx<'ll, 'tcx>,
|
|
struct_type: Ty<'tcx>,
|
|
struct_type_name: &str,
|
|
unique_type_id: UniqueTypeId,
|
|
containing_scope: Option<&'ll DIScope>,
|
|
) -> &'ll DICompositeType {
|
|
let (struct_size, struct_align) = cx.size_and_align_of(struct_type);
|
|
|
|
let name = SmallCStr::new(struct_type_name);
|
|
let unique_type_id = SmallCStr::new(
|
|
debug_context(cx).type_map.borrow().get_unique_type_id_as_string(unique_type_id),
|
|
);
|
|
let metadata_stub = unsafe {
|
|
// `LLVMRustDIBuilderCreateStructType()` wants an empty array. A null
|
|
// pointer will lead to hard to trace and debug LLVM assertions
|
|
// later on in `llvm/lib/IR/Value.cpp`.
|
|
let empty_array = create_DIArray(DIB(cx), &[]);
|
|
|
|
llvm::LLVMRustDIBuilderCreateStructType(
|
|
DIB(cx),
|
|
containing_scope,
|
|
name.as_ptr(),
|
|
unknown_file_metadata(cx),
|
|
UNKNOWN_LINE_NUMBER,
|
|
struct_size.bits(),
|
|
struct_align.bits() as u32,
|
|
DIFlags::FlagZero,
|
|
None,
|
|
empty_array,
|
|
0,
|
|
None,
|
|
unique_type_id.as_ptr(),
|
|
)
|
|
};
|
|
|
|
metadata_stub
|
|
}
|
|
|
|
fn create_union_stub(
|
|
cx: &CodegenCx<'ll, 'tcx>,
|
|
union_type: Ty<'tcx>,
|
|
union_type_name: &str,
|
|
unique_type_id: UniqueTypeId,
|
|
containing_scope: &'ll DIScope,
|
|
) -> &'ll DICompositeType {
|
|
let (union_size, union_align) = cx.size_and_align_of(union_type);
|
|
|
|
let name = SmallCStr::new(union_type_name);
|
|
let unique_type_id = SmallCStr::new(
|
|
debug_context(cx).type_map.borrow().get_unique_type_id_as_string(unique_type_id),
|
|
);
|
|
let metadata_stub = unsafe {
|
|
// `LLVMRustDIBuilderCreateUnionType()` wants an empty array. A null
|
|
// pointer will lead to hard to trace and debug LLVM assertions
|
|
// later on in `llvm/lib/IR/Value.cpp`.
|
|
let empty_array = create_DIArray(DIB(cx), &[]);
|
|
|
|
llvm::LLVMRustDIBuilderCreateUnionType(
|
|
DIB(cx),
|
|
containing_scope,
|
|
name.as_ptr(),
|
|
unknown_file_metadata(cx),
|
|
UNKNOWN_LINE_NUMBER,
|
|
union_size.bits(),
|
|
union_align.bits() as u32,
|
|
DIFlags::FlagZero,
|
|
Some(empty_array),
|
|
0, // RuntimeLang
|
|
unique_type_id.as_ptr(),
|
|
)
|
|
};
|
|
|
|
metadata_stub
|
|
}
|
|
|
|
/// Creates debug information for the given global variable.
|
|
///
|
|
/// Adds the created metadata nodes directly to the crate's IR.
|
|
pub fn create_global_var_metadata(cx: &CodegenCx<'ll, '_>, def_id: DefId, global: &'ll Value) {
|
|
if cx.dbg_cx.is_none() {
|
|
return;
|
|
}
|
|
|
|
let tcx = cx.tcx;
|
|
let attrs = tcx.codegen_fn_attrs(def_id);
|
|
|
|
if attrs.flags.contains(CodegenFnAttrFlags::NO_DEBUG) {
|
|
return;
|
|
}
|
|
|
|
let no_mangle = attrs.flags.contains(CodegenFnAttrFlags::NO_MANGLE);
|
|
// 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 = span_start(cx, span);
|
|
(file_metadata(cx, &loc.file.name, LOCAL_CRATE), loc.line as c_uint)
|
|
} 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).monomorphic_ty(cx.tcx);
|
|
let type_metadata = type_metadata(cx, variable_type, span);
|
|
let var_name = SmallCStr::new(&tcx.item_name(def_id).as_str());
|
|
let linkage_name = if no_mangle {
|
|
None
|
|
} else {
|
|
let linkage_name = mangled_name_of_instance(cx, Instance::mono(tcx, def_id));
|
|
Some(SmallCStr::new(&linkage_name.name.as_str()))
|
|
};
|
|
|
|
let global_align = cx.align_of(variable_type);
|
|
|
|
unsafe {
|
|
llvm::LLVMRustDIBuilderCreateStaticVariable(
|
|
DIB(cx),
|
|
Some(var_scope),
|
|
var_name.as_ptr(),
|
|
// If null, linkage_name field is omitted,
|
|
// which is what we want for no_mangle statics
|
|
linkage_name.as_ref().map_or(ptr::null(), |name| name.as_ptr()),
|
|
file_metadata,
|
|
line_number,
|
|
type_metadata,
|
|
is_local_to_unit,
|
|
global,
|
|
None,
|
|
global_align.bytes() as u32,
|
|
);
|
|
}
|
|
}
|
|
|
|
/// 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_metadata(cx: &CodegenCx<'ll, 'tcx>, ty: Ty<'tcx>, vtable: &'ll Value) {
|
|
if cx.dbg_cx.is_none() {
|
|
return;
|
|
}
|
|
|
|
let type_metadata = type_metadata(cx, ty, rustc_span::DUMMY_SP);
|
|
|
|
unsafe {
|
|
// `LLVMRustDIBuilderCreateStructType()` wants an empty array. A null
|
|
// pointer will lead to hard to trace and debug LLVM assertions
|
|
// later on in `llvm/lib/IR/Value.cpp`.
|
|
let empty_array = create_DIArray(DIB(cx), &[]);
|
|
|
|
let name = const_cstr!("vtable");
|
|
|
|
// Create a new one each time. We don't want metadata caching
|
|
// here, because each vtable will refer to a unique containing
|
|
// type.
|
|
let vtable_type = llvm::LLVMRustDIBuilderCreateStructType(
|
|
DIB(cx),
|
|
NO_SCOPE_METADATA,
|
|
name.as_ptr(),
|
|
unknown_file_metadata(cx),
|
|
UNKNOWN_LINE_NUMBER,
|
|
Size::ZERO.bits(),
|
|
cx.tcx.data_layout.pointer_align.abi.bits() as u32,
|
|
DIFlags::FlagArtificial,
|
|
None,
|
|
empty_array,
|
|
0,
|
|
Some(type_metadata),
|
|
name.as_ptr(),
|
|
);
|
|
|
|
llvm::LLVMRustDIBuilderCreateStaticVariable(
|
|
DIB(cx),
|
|
NO_SCOPE_METADATA,
|
|
name.as_ptr(),
|
|
ptr::null(),
|
|
unknown_file_metadata(cx),
|
|
UNKNOWN_LINE_NUMBER,
|
|
vtable_type,
|
|
true,
|
|
vtable,
|
|
None,
|
|
0,
|
|
);
|
|
}
|
|
}
|
|
|
|
/// Creates an "extension" of an existing `DIScope` into another file.
|
|
pub fn extend_scope_to_file(
|
|
cx: &CodegenCx<'ll, '_>,
|
|
scope_metadata: &'ll DIScope,
|
|
file: &rustc_span::SourceFile,
|
|
defining_crate: CrateNum,
|
|
) -> &'ll DILexicalBlock {
|
|
let file_metadata = file_metadata(cx, &file.name, defining_crate);
|
|
unsafe { llvm::LLVMRustDIBuilderCreateLexicalBlockFile(DIB(cx), scope_metadata, file_metadata) }
|
|
}
|