Rollup of 7 pull requests

.gitignore

@@ -41,7 +41,7 @@ no_llvm_build
 /inst/
 /llvm/
 /mingw-build/
-/build/
+build/
 /build-rust-analyzer/
 /dist/
 /unicode-downloads

Cargo.lock

@@ -2287,6 +2287,7 @@ dependencies = [
  "anyhow",
  "clap 4.1.4",
  "fs-err",
+ "rustc-hash",
  "rustdoc-json-types",
  "serde",
  "serde_json",
@@ -4850,6 +4851,7 @@ dependencies = [
 name = "rustdoc-json-types"
 version = "0.1.0"
 dependencies = [
+ "rustc-hash",
  "serde",
  "serde_json",
 ]

compiler/rustc_trait_selection/src/traits/select/mod.rs

@@ -2149,7 +2149,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
             ty::Alias(..) | ty::Param(_) | ty::Placeholder(..) => None,
             ty::Infer(ty::TyVar(_)) => Ambiguous,
 
-            // We can make this an ICE if/once we actually instantiate the trait obligation.
+            // We can make this an ICE if/once we actually instantiate the trait obligation eagerly.
             ty::Bound(..) => None,
 
             ty::Infer(ty::FreshTy(_) | ty::FreshIntTy(_) | ty::FreshFloatTy(_)) => {
@@ -2257,7 +2257,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
                 }
             }
 
-            ty::Adt(..) | ty::Alias(..) | ty::Param(..) => {
+            ty::Adt(..) | ty::Alias(..) | ty::Param(..) | ty::Placeholder(..) => {
                 // Fallback to whatever user-defined impls exist in this case.
                 None
             }
@@ -2269,9 +2269,10 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
                 Ambiguous
             }
 
-            ty::Placeholder(..)
-            | ty::Bound(..)
-            | ty::Infer(ty::FreshTy(_) | ty::FreshIntTy(_) | ty::FreshFloatTy(_)) => {
+            // We can make this an ICE if/once we actually instantiate the trait obligation eagerly.
+            ty::Bound(..) => None,
+
+            ty::Infer(ty::FreshTy(_) | ty::FreshIntTy(_) | ty::FreshFloatTy(_)) => {
                 bug!("asked to assemble builtin bounds of unexpected type: {:?}", self_ty);
             }
         }

config.toml.example

@@ -46,12 +46,6 @@ changelog-seen = 2
 # Defaults to "if-available" when `channel = "dev"` and "false" otherwise.
 #download-ci-llvm = "if-available"
 
-# Indicates whether LLVM rebuild should be skipped when running bootstrap. If
-# this is `false` then the compiler's LLVM will be rebuilt whenever the built
-# version doesn't have the correct hash. If it is `true` then LLVM will never
-# be rebuilt. The default value is `false`.
-#skip-rebuild = false
-
 # Indicates whether the LLVM build is a Release or Debug build
 #optimize = true
 

src/bootstrap/config.rs

@@ -112,7 +112,6 @@ pub struct Config {
     pub backtrace_on_ice: bool,
 
     // llvm codegen options
-    pub llvm_skip_rebuild: bool,
     pub llvm_assertions: bool,
     pub llvm_tests: bool,
     pub llvm_plugins: bool,
@@ -666,7 +665,6 @@ define_config! {
 define_config! {
     /// TOML representation of how the LLVM build is configured.
     struct Llvm {
-        skip_rebuild: Option<bool> = "skip-rebuild",
         optimize: Option<bool> = "optimize",
         thin_lto: Option<bool> = "thin-lto",
         release_debuginfo: Option<bool> = "release-debuginfo",
@@ -1060,11 +1058,6 @@ impl Config {
             config.mandir = install.mandir.map(PathBuf::from);
         }
 
-        // We want the llvm-skip-rebuild flag to take precedence over the
-        // skip-rebuild config.toml option so we store it separately
-        // so that we can infer the right value
-        let mut llvm_skip_rebuild = flags.llvm_skip_rebuild;
-
         // Store off these values as options because if they're not provided
         // we'll infer default values for them later
         let mut llvm_assertions = None;
@@ -1170,7 +1163,6 @@ impl Config {
             llvm_assertions = llvm.assertions;
             llvm_tests = llvm.tests;
             llvm_plugins = llvm.plugins;
-            llvm_skip_rebuild = llvm_skip_rebuild.or(llvm.skip_rebuild);
             set(&mut config.llvm_optimize, llvm.optimize);
             set(&mut config.llvm_thin_lto, llvm.thin_lto);
             set(&mut config.llvm_release_debuginfo, llvm.release_debuginfo);
@@ -1324,7 +1316,6 @@ impl Config {
         // Now that we've reached the end of our configuration, infer the
         // default values for all options that we haven't otherwise stored yet.
 
-        config.llvm_skip_rebuild = llvm_skip_rebuild.unwrap_or(false);
         config.llvm_assertions = llvm_assertions.unwrap_or(false);
         config.llvm_tests = llvm_tests.unwrap_or(false);
         config.llvm_plugins = llvm_plugins.unwrap_or(false);

src/bootstrap/defaults/config.codegen.toml

@@ -17,3 +17,5 @@ debug-logging = true
 incremental = true
 # Print backtrace on internal compiler errors during bootstrap
 backtrace-on-ice = true
+# Make the compiler and standard library faster to build, at the expense of a ~20% runtime slowdown.
+lto = "off"

src/bootstrap/flags.rs

@@ -67,8 +67,6 @@ pub struct Flags {
     // true => deny, false => warn
     pub deny_warnings: Option<bool>,
 
-    pub llvm_skip_rebuild: Option<bool>,
-
     pub rust_profile_use: Option<String>,
     pub rust_profile_generate: Option<String>,
 
@@ -249,14 +247,6 @@ To learn more about a subcommand, run `./x.py <subcommand> -h`",
         opts.optopt("", "error-format", "rustc error format", "FORMAT");
         opts.optflag("", "json-output", "use message-format=json");
         opts.optopt("", "color", "whether to use color in cargo and rustc output", "STYLE");
-        opts.optopt(
-            "",
-            "llvm-skip-rebuild",
-            "whether rebuilding llvm should be skipped \
-             a VALUE of TRUE indicates that llvm will not be rebuilt \
-             VALUE overrides the skip-rebuild option in config.toml.",
-            "VALUE",
-        );
         opts.optopt(
             "",
             "rust-profile-generate",
@@ -714,9 +704,6 @@ Arguments:
                 .collect::<Vec<_>>(),
             include_default_paths: matches.opt_present("include-default-paths"),
             deny_warnings: parse_deny_warnings(&matches),
-            llvm_skip_rebuild: matches.opt_str("llvm-skip-rebuild").map(|s| s.to_lowercase()).map(
-                |s| s.parse::<bool>().expect("`llvm-skip-rebuild` should be either true or false"),
-            ),
             color: matches
                 .opt_get_default("color", Color::Auto)
                 .expect("`color` should be `always`, `never`, or `auto`"),

src/bootstrap/native.rs

@@ -108,15 +108,6 @@ pub fn prebuilt_llvm_config(
     let stamp = out_dir.join("llvm-finished-building");
     let stamp = HashStamp::new(stamp, builder.in_tree_llvm_info.sha());
 
-    if builder.config.llvm_skip_rebuild && stamp.path.exists() {
-        builder.info(
-            "Warning: \
-                Using a potentially stale build of LLVM; \
-                This may not behave well.",
-        );
-        return Ok(res);
-    }
-
     if stamp.is_done() {
         if stamp.hash.is_none() {
             builder.info(

src/bootstrap/setup.rs

@@ -24,15 +24,15 @@ pub enum Profile {
     None,
 }
 
-/// A list of historical hashes of `src/etc/vscode_settings.json`.
+/// A list of historical hashes of `src/etc/rust_analyzer_settings.json`.
 /// New entries should be appended whenever this is updated so we can detect
 /// outdated vs. user-modified settings files.
 static SETTINGS_HASHES: &[&str] = &[
     "ea67e259dedf60d4429b6c349a564ffcd1563cf41c920a856d1f5b16b4701ac8",
     "56e7bf011c71c5d81e0bf42e84938111847a810eee69d906bba494ea90b51922",
     "af1b5efe196aed007577899db9dae15d6dbc923d6fa42fa0934e68617ba9bbe0",
 ];
-static VSCODE_SETTINGS: &str = include_str!("../etc/vscode_settings.json");
+static RUST_ANALYZER_SETTINGS: &str = include_str!("../etc/rust_analyzer_settings.json");
 
 impl Profile {
     fn include_path(&self, src_path: &Path) -> PathBuf {
@@ -489,7 +489,7 @@ undesirable, simply delete the `pre-push` file from .git/hooks."
     Ok(())
 }
 
-/// Sets up or displays `src/etc/vscode_settings.json`
+/// Sets up or displays `src/etc/rust_analyzer_settings.json`
 #[derive(Clone, Copy, Debug, Eq, PartialEq, Hash)]
 pub struct Vscode;
 
@@ -580,10 +580,10 @@ fn create_vscode_settings_maybe(config: &Config) -> io::Result<()> {
             }
             _ => "Created",
         };
-        fs::write(&vscode_settings, &VSCODE_SETTINGS)?;
+        fs::write(&vscode_settings, &RUST_ANALYZER_SETTINGS)?;
         println!("{verb} `.vscode/settings.json`");
     } else {
-        println!("\n{VSCODE_SETTINGS}");
+        println!("\n{RUST_ANALYZER_SETTINGS}");
     }
     Ok(())
 }

src/bootstrap/setup/tests.rs

@@ -1,14 +1,14 @@
-use super::{SETTINGS_HASHES, VSCODE_SETTINGS};
+use super::{RUST_ANALYZER_SETTINGS, SETTINGS_HASHES};
 use sha2::Digest;
 
 #[test]
 fn check_matching_settings_hash() {
     let mut hasher = sha2::Sha256::new();
-    hasher.update(&VSCODE_SETTINGS);
+    hasher.update(&RUST_ANALYZER_SETTINGS);
     let hash = hex::encode(hasher.finalize().as_slice());
     assert_eq!(
         &hash,
         SETTINGS_HASHES.last().unwrap(),
-        "Update `SETTINGS_HASHES` with the new hash of `src/etc/vscode_settings.json`"
+        "Update `SETTINGS_HASHES` with the new hash of `src/etc/rust_analyzer_settings.json`"
     );
 }

src/doc/rustc/src/platform-support/armeb-unknown-linux-gnueabi.md

@@ -26,7 +26,6 @@ Therefore, you can build Rust with support for the target by adding it to the ta
 ```toml
 [llvm]
 download-ci-llvm = false
-skip-rebuild = true
 optimize = true
 ninja = true
 targets = "ARM;X86"

src/rustdoc-json-types/Cargo.toml

@@ -8,6 +8,7 @@ path = "lib.rs"
 
 [dependencies]
 serde = { version = "1.0", features = ["derive"] }
+rustc-hash = "1.1.0"
 
 [dev-dependencies]
 serde_json = "1.0"

src/rustdoc-json-types/lib.rs

@@ -3,10 +3,9 @@
 //! These types are the public API exposed through the `--output-format json` flag. The [`Crate`]
 //! struct is the root of the JSON blob and all other items are contained within.
 
-use std::collections::HashMap;
-use std::path::PathBuf;
-
+use rustc_hash::FxHashMap;
 use serde::{Deserialize, Serialize};
+use std::path::PathBuf;
 
 /// rustdoc format-version.
 pub const FORMAT_VERSION: u32 = 24;
@@ -24,11 +23,11 @@ pub struct Crate {
     pub includes_private: bool,
     /// A collection of all items in the local crate as well as some external traits and their
     /// items that are referenced locally.
-    pub index: HashMap<Id, Item>,
+    pub index: FxHashMap<Id, Item>,
     /// Maps IDs to fully qualified paths and other info helpful for generating links.
-    pub paths: HashMap<Id, ItemSummary>,
+    pub paths: FxHashMap<Id, ItemSummary>,
     /// Maps `crate_id` of items to a crate name and html_root_url if it exists.
-    pub external_crates: HashMap<u32, ExternalCrate>,
+    pub external_crates: FxHashMap<u32, ExternalCrate>,
     /// A single version number to be used in the future when making backwards incompatible changes
     /// to the JSON output.
     pub format_version: u32,
@@ -54,8 +53,8 @@ pub struct ItemSummary {
     ///
     /// Note that items can appear in multiple paths, and the one chosen is implementation
     /// defined. Currently, this is the full path to where the item was defined. Eg
-    /// [`String`] is currently `["alloc", "string", "String"]` and [`HashMap`] is
-    /// `["std", "collections", "hash", "map", "HashMap"]`, but this is subject to change.
+    /// [`String`] is currently `["alloc", "string", "String"]` and [`HashMap`][`std::collections::HashMap`]
+    /// is `["std", "collections", "hash", "map", "HashMap"]`, but this is subject to change.
     pub path: Vec<String>,
     /// Whether this item is a struct, trait, macro, etc.
     pub kind: ItemKind,
@@ -80,7 +79,7 @@ pub struct Item {
     /// Some("") if there is some documentation but it is empty (EG `#[doc = ""]`).
     pub docs: Option<String>,
     /// This mapping resolves [intra-doc links](https://github.com/rust-lang/rfcs/blob/master/text/1946-intra-rustdoc-links.md) from the docstring to their IDs
-    pub links: HashMap<String, Id>,
+    pub links: FxHashMap<String, Id>,
     /// Stringified versions of the attributes on this item (e.g. `"#[inline]"`)
     pub attrs: Vec<String>,
     pub deprecation: Option<Deprecation>,

src/tools/jsondoclint/Cargo.toml

@@ -9,6 +9,7 @@ edition = "2021"
 anyhow = "1.0.62"
 clap = { version = "4.0.15", features = ["derive"] }
 fs-err = "2.8.1"
+rustc-hash = "1.1.0"
 rustdoc-json-types = { version = "0.1.0", path = "../../rustdoc-json-types" }
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0.85"