Auto merge of rust-lang#80692 - Aaron1011:feature/query-result-debug, r=estebank

Enforce that query results implement Debug

Currently, we require that query keys implement `Debug`, but we do not do the same for query values. This can make incremental compilation bugs difficult to debug - there isn't a good place to print out the result loaded from disk.

This PR adds `Debug` bounds to several query-related functions, allowing us to debug-print the query value when an 'unstable fingerprint' error occurs. This required adding `#[derive(Debug)]` to a fairly large number of types - hopefully, this doesn't have much of an impact on compiler bootstrapping times.

Author: bors

compiler/rustc_attr/src/builtin.rs

@@ -66,21 +66,21 @@ fn handle_errors(sess: &ParseSess, span: Span, error: AttrError) {
     }
 }
 
-#[derive(Copy, Clone, PartialEq, Encodable, Decodable)]
+#[derive(Copy, Clone, PartialEq, Encodable, Decodable, Debug)]
 pub enum InlineAttr {
     None,
     Hint,
     Always,
     Never,
 }
 
-#[derive(Clone, Encodable, Decodable)]
+#[derive(Clone, Encodable, Decodable, Debug)]
 pub enum InstructionSetAttr {
     ArmA32,
     ArmT32,
 }
 
-#[derive(Clone, Encodable, Decodable)]
+#[derive(Clone, Encodable, Decodable, Debug)]
 pub enum OptimizeAttr {
     None,
     Speed,

compiler/rustc_data_structures/src/stable_hasher.rs

@@ -552,6 +552,7 @@ pub fn hash_stable_hashmap<HCX, K, V, R, SK, F>(
 
 /// A vector container that makes sure that its items are hashed in a stable
 /// order.
+#[derive(Debug)]
 pub struct StableVec<T>(Vec<T>);
 
 impl<T> StableVec<T> {

compiler/rustc_data_structures/src/steal.rs

@@ -21,6 +21,7 @@ use crate::sync::{MappedReadGuard, ReadGuard, RwLock};
 /// -- once the value is stolen -- it will never be read from again.
 //
 // FIXME(#41710): what is the best way to model linear queries?
+#[derive(Debug)]
 pub struct Steal<T> {
     value: RwLock<Option<T>>,
 }

compiler/rustc_feature/src/active.rs

@@ -36,7 +36,7 @@ macro_rules! declare_features {
             ),+];
 
         /// A set of features to be used by later passes.
-        #[derive(Clone, Default)]
+        #[derive(Clone, Default, Debug)]
         pub struct Features {
             /// `#![feature]` attrs for language features, for error reporting.
             pub declared_lang_features: Vec<(Symbol, Span, Option<Symbol>)>,

compiler/rustc_hir/src/lang_items.rs

@@ -67,7 +67,7 @@ macro_rules! language_item_table {
             }
         }
 
-        #[derive(HashStable_Generic)]
+        #[derive(HashStable_Generic, Debug)]
         pub struct LanguageItems {
             /// Mappings from lang items to their possibly found `DefId`s.
             /// The index corresponds to the order in `LangItem`.

compiler/rustc_middle/src/hir/map/mod.rs

@@ -85,11 +85,13 @@ fn is_body_owner<'hir>(node: Node<'hir>, hir_id: HirId) -> bool {
     }
 }
 
+#[derive(Debug)]
 pub(super) struct HirOwnerData<'hir> {
     pub(super) signature: Option<&'hir Owner<'hir>>,
     pub(super) with_bodies: Option<&'hir mut OwnerNodes<'hir>>,
 }
 
+#[derive(Debug)]
 pub struct IndexedHir<'hir> {
     /// The SVH of the local crate.
     pub crate_hash: Svh,

compiler/rustc_middle/src/hir/mod.rs

@@ -17,6 +17,7 @@ use rustc_hir::*;
 use rustc_index::vec::IndexVec;
 use rustc_span::DUMMY_SP;
 
+#[derive(Debug)]
 pub struct Owner<'tcx> {
     parent: HirId,
     node: Node<'tcx>,
@@ -32,12 +33,13 @@ impl<'a, 'tcx> HashStable<StableHashingContext<'a>> for Owner<'tcx> {
     }
 }
 
-#[derive(Clone)]
+#[derive(Clone, Debug)]
 pub struct ParentedNode<'tcx> {
     parent: ItemLocalId,
     node: Node<'tcx>,
 }
 
+#[derive(Debug)]
 pub struct OwnerNodes<'tcx> {
     hash: Fingerprint,
     nodes: IndexVec<ItemLocalId, Option<ParentedNode<'tcx>>>,

compiler/rustc_middle/src/lint.rs

@@ -12,7 +12,7 @@ use rustc_span::source_map::{DesugaringKind, ExpnKind, MultiSpan};
 use rustc_span::{symbol, Span, Symbol, DUMMY_SP};
 
 /// How a lint level was set.
-#[derive(Clone, Copy, PartialEq, Eq, HashStable)]
+#[derive(Clone, Copy, PartialEq, Eq, HashStable, Debug)]
 pub enum LintLevelSource {
     /// Lint is at the default level as declared
     /// in rustc or a plugin.
@@ -48,11 +48,13 @@ impl LintLevelSource {
 /// A tuple of a lint level and its source.
 pub type LevelAndSource = (Level, LintLevelSource);
 
+#[derive(Debug)]
 pub struct LintLevelSets {
     pub list: Vec<LintSet>,
     pub lint_cap: Level,
 }
 
+#[derive(Debug)]
 pub enum LintSet {
     CommandLine {
         // -A,-W,-D flags, a `Symbol` for the flag itself and `Level` for which
@@ -139,6 +141,7 @@ impl LintLevelSets {
     }
 }
 
+#[derive(Debug)]
 pub struct LintLevelMap {
     pub sets: LintLevelSets,
     pub id_to_set: FxHashMap<HirId, u32>,

compiler/rustc_middle/src/middle/codegen_fn_attrs.rs

@@ -3,7 +3,7 @@ use rustc_attr::{InlineAttr, InstructionSetAttr, OptimizeAttr};
 use rustc_session::config::SanitizerSet;
 use rustc_span::symbol::Symbol;
 
-#[derive(Clone, TyEncodable, TyDecodable, HashStable)]
+#[derive(Clone, TyEncodable, TyDecodable, HashStable, Debug)]
 pub struct CodegenFnAttrs {
     pub flags: CodegenFnAttrFlags,
     /// Parsed representation of the `#[inline]` attribute

compiler/rustc_middle/src/middle/cstore.rs

@@ -96,7 +96,7 @@ pub struct NativeLib {
     pub wasm_import_module: Option<Symbol>,
 }
 
-#[derive(Clone, TyEncodable, TyDecodable, HashStable)]
+#[derive(Clone, TyEncodable, TyDecodable, HashStable, Debug)]
 pub struct ForeignModule {
     pub foreign_items: Vec<DefId>,
     pub def_id: DefId,