name = "build_helper"
version = "0.1.0"
+[[package]]
+name = "bump-stage0"
+version = "0.1.0"
+dependencies = [
+ "anyhow",
+ "curl",
+ "indexmap",
+ "serde",
+ "serde_json",
+ "toml",
+]
+
[[package]]
name = "byte-tools"
version = "0.3.1"
dependencies = [
"cargo_metadata 0.12.0",
"clippy_lints",
- "compiletest_rs",
+ "compiletest_rs 0.6.0",
"derive-new",
"filetime",
"quote",
"winapi",
]
+[[package]]
+name = "compiletest_rs"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "64698e5e2435db061a85e6320af12c30c5fd88eb84b35d2c1e03ce4f143255ca"
+dependencies = [
+ "diff",
+ "filetime",
+ "getopts",
+ "lazy_static",
+ "libc",
+ "log",
+ "miow",
+ "regex",
+ "rustfix 0.5.1",
+ "serde",
+ "serde_derive",
+ "serde_json",
+ "tempfile",
+ "tester",
+ "winapi",
+]
+
[[package]]
name = "core"
version = "0.0.0"
dependencies = [
"autocfg",
"hashbrown",
+ "serde",
]
[[package]]
version = "0.1.0"
dependencies = [
"colored",
- "compiletest_rs",
+ "compiletest_rs 0.7.0",
"env_logger 0.8.1",
"getrandom 0.2.0",
"hex 0.4.2",
"src/tools/expand-yaml-anchors",
"src/tools/jsondocck",
"src/tools/html-checker",
+ "src/tools/bump-stage0",
]
exclude = [
use std::iter::FromIterator;
-/// A vector type optimized for cases where this size is usually 0 (cf. `SmallVector`).
+/// A vector type optimized for cases where this size is usually 0 (cf. `SmallVec`).
/// The `Option<Box<..>>` wrapping allows us to represent a zero sized vector with `None`,
/// which uses only a single (null) pointer.
#[derive(Clone, Encodable, Decodable, Debug)]
use std::env;
use std::fs;
use std::io::{self, Read};
-use std::path::Path;
+use std::path::{Path, PathBuf};
+use rustc_data_structures::memmap::Mmap;
use rustc_serialize::opaque::{FileEncodeResult, FileEncoder};
use rustc_serialize::Encoder;
+use rustc_session::Session;
/// The first few bytes of files generated by incremental compilation.
const FILE_MAGIC: &[u8] = b"RSIC";
/// the Git commit hash.
const RUSTC_VERSION: Option<&str> = option_env!("CFG_VERSION");
-pub fn write_file_header(stream: &mut FileEncoder, nightly_build: bool) -> FileEncodeResult {
+pub(crate) fn write_file_header(stream: &mut FileEncoder, nightly_build: bool) -> FileEncodeResult {
stream.emit_raw_bytes(FILE_MAGIC)?;
stream.emit_raw_bytes(&[
(HEADER_FORMAT_VERSION >> 0) as u8,
stream.emit_raw_bytes(rustc_version.as_bytes())
}
+pub(crate) fn save_in<F>(sess: &Session, path_buf: PathBuf, name: &str, encode: F)
+where
+ F: FnOnce(&mut FileEncoder) -> FileEncodeResult,
+{
+ debug!("save: storing data in {}", path_buf.display());
+
+ // Delete the old file, if any.
+ // Note: It's important that we actually delete the old file and not just
+ // truncate and overwrite it, since it might be a shared hard-link, the
+ // underlying data of which we don't want to modify.
+ //
+ // We have to ensure we have dropped the memory maps to this file
+ // before performing this removal.
+ match fs::remove_file(&path_buf) {
+ Ok(()) => {
+ debug!("save: remove old file");
+ }
+ Err(err) if err.kind() == io::ErrorKind::NotFound => (),
+ Err(err) => {
+ sess.err(&format!(
+ "unable to delete old {} at `{}`: {}",
+ name,
+ path_buf.display(),
+ err
+ ));
+ return;
+ }
+ }
+
+ let mut encoder = match FileEncoder::new(&path_buf) {
+ Ok(encoder) => encoder,
+ Err(err) => {
+ sess.err(&format!("failed to create {} at `{}`: {}", name, path_buf.display(), err));
+ return;
+ }
+ };
+
+ if let Err(err) = write_file_header(&mut encoder, sess.is_nightly_build()) {
+ sess.err(&format!("failed to write {} header to `{}`: {}", name, path_buf.display(), err));
+ return;
+ }
+
+ if let Err(err) = encode(&mut encoder) {
+ sess.err(&format!("failed to write {} to `{}`: {}", name, path_buf.display(), err));
+ return;
+ }
+
+ if let Err(err) = encoder.flush() {
+ sess.err(&format!("failed to flush {} to `{}`: {}", name, path_buf.display(), err));
+ return;
+ }
+
+ debug!("save: data written to disk successfully");
+}
+
/// Reads the contents of a file with a file header as defined in this module.
///
/// - Returns `Ok(Some(data, pos))` if the file existed and was generated by a
report_incremental_info: bool,
path: &Path,
nightly_build: bool,
-) -> io::Result<Option<(Vec<u8>, usize)>> {
- let data = match fs::read(path) {
- Ok(data) => data,
+) -> io::Result<Option<(Mmap, usize)>> {
+ let file = match fs::File::open(path) {
+ Ok(file) => file,
Err(err) if err.kind() == io::ErrorKind::NotFound => return Ok(None),
Err(err) => return Err(err),
};
+ // SAFETY: This process must not modify nor remove the backing file while the memory map lives.
+ // For the dep-graph and the work product index, it is as soon as the decoding is done.
+ // For the query result cache, the memory map is dropped in save_dep_graph before calling
+ // save_in and trying to remove the backing file.
+ //
+ // There is no way to prevent another process from modifying this file.
+ let mmap = unsafe { Mmap::map(file) }?;
- let mut file = io::Cursor::new(data);
+ let mut file = io::Cursor::new(&*mmap);
// Check FILE_MAGIC
{
}
let post_header_start_pos = file.position() as usize;
- Ok(Some((file.into_inner(), post_header_start_pos)))
+ Ok(Some((mmap, post_header_start_pos)))
}
fn report_format_mismatch(report_incremental_info: bool, file: &Path, message: &str) {
//! Code to save/load the dep-graph from files.
use rustc_data_structures::fx::FxHashMap;
+use rustc_data_structures::memmap::Mmap;
use rustc_middle::dep_graph::{SerializedDepGraph, WorkProduct, WorkProductId};
use rustc_middle::ty::OnDiskCache;
use rustc_serialize::opaque::Decoder;
report_incremental_info: bool,
path: &Path,
nightly_build: bool,
-) -> LoadResult<(Vec<u8>, usize)> {
+) -> LoadResult<(Mmap, usize)> {
match file_format::read_file(report_incremental_info, path, nightly_build) {
Ok(Some(data_and_pos)) => LoadResult::Ok { data: data_and_pos },
Ok(None) => {
use rustc_serialize::Encodable as RustcEncodable;
use rustc_session::Session;
use std::fs;
-use std::io;
-use std::path::PathBuf;
use super::data::*;
use super::dirty_clean;
join(
move || {
sess.time("incr_comp_persist_result_cache", || {
- save_in(sess, query_cache_path, "query cache", |e| encode_query_cache(tcx, e));
+ // Drop the memory map so that we can remove the file and write to it.
+ if let Some(odc) = &tcx.on_disk_cache {
+ odc.drop_serialized_data(tcx);
+ }
+
+ file_format::save_in(sess, query_cache_path, "query cache", |e| {
+ encode_query_cache(tcx, e)
+ });
});
},
move || {
debug!("save_work_product_index()");
dep_graph.assert_ignored();
let path = work_products_path(sess);
- save_in(sess, path, "work product index", |e| encode_work_product_index(&new_work_products, e));
+ file_format::save_in(sess, path, "work product index", |e| {
+ encode_work_product_index(&new_work_products, e)
+ });
// We also need to clean out old work-products, as not all of them are
// deleted during invalidation. Some object files don't change their
});
}
-pub(crate) fn save_in<F>(sess: &Session, path_buf: PathBuf, name: &str, encode: F)
-where
- F: FnOnce(&mut FileEncoder) -> FileEncodeResult,
-{
- debug!("save: storing data in {}", path_buf.display());
-
- // Delete the old file, if any.
- // Note: It's important that we actually delete the old file and not just
- // truncate and overwrite it, since it might be a shared hard-link, the
- // underlying data of which we don't want to modify
- match fs::remove_file(&path_buf) {
- Ok(()) => {
- debug!("save: remove old file");
- }
- Err(err) if err.kind() == io::ErrorKind::NotFound => (),
- Err(err) => {
- sess.err(&format!(
- "unable to delete old {} at `{}`: {}",
- name,
- path_buf.display(),
- err
- ));
- return;
- }
- }
-
- let mut encoder = match FileEncoder::new(&path_buf) {
- Ok(encoder) => encoder,
- Err(err) => {
- sess.err(&format!("failed to create {} at `{}`: {}", name, path_buf.display(), err));
- return;
- }
- };
-
- if let Err(err) = file_format::write_file_header(&mut encoder, sess.is_nightly_build()) {
- sess.err(&format!("failed to write {} header to `{}`: {}", name, path_buf.display(), err));
- return;
- }
-
- if let Err(err) = encode(&mut encoder) {
- sess.err(&format!("failed to write {} to `{}`: {}", name, path_buf.display(), err));
- return;
- }
-
- if let Err(err) = encoder.flush() {
- sess.err(&format!("failed to flush {} to `{}`: {}", name, path_buf.display(), err));
- return;
- }
-
- debug!("save: data written to disk successfully");
-}
-
fn encode_work_product_index(
work_products: &FxHashMap<WorkProductId, WorkProduct>,
encoder: &mut FileEncoder,
use rustc_ast as ast;
use rustc_attr as attr;
use rustc_data_structures::fx::{FxHashMap, FxHashSet};
+use rustc_data_structures::memmap::Mmap;
use rustc_data_structures::profiling::SelfProfilerRef;
use rustc_data_structures::sharded::{IntoPointer, ShardedHashMap};
use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
pub trait OnDiskCache<'tcx>: rustc_data_structures::sync::Sync {
/// Creates a new `OnDiskCache` instance from the serialized data in `data`.
- fn new(sess: &'tcx Session, data: Vec<u8>, start_pos: usize) -> Self
+ fn new(sess: &'tcx Session, data: Mmap, start_pos: usize) -> Self
where
Self: Sized;
fn register_reused_dep_node(&self, tcx: TyCtxt<'tcx>, dep_node: &DepNode);
fn store_foreign_def_id_hash(&self, def_id: DefId, hash: DefPathHash);
+ fn drop_serialized_data(&self, tcx: TyCtxt<'tcx>);
+
fn serialize(&self, tcx: TyCtxt<'tcx>, encoder: &mut FileEncoder) -> FileEncodeResult;
}
use crate::QueryCtxt;
use rustc_data_structures::fx::{FxHashMap, FxHashSet, FxIndexSet};
-use rustc_data_structures::sync::{HashMapExt, Lock, Lrc, OnceCell};
+use rustc_data_structures::memmap::Mmap;
+use rustc_data_structures::sync::{HashMapExt, Lock, Lrc, OnceCell, RwLock};
use rustc_data_structures::unhash::UnhashMap;
use rustc_hir::def_id::{CrateNum, DefId, DefIndex, LocalDefId, StableCrateId, LOCAL_CRATE};
use rustc_hir::definitions::DefPathHash;
/// any side effects that have been emitted during a query.
pub struct OnDiskCache<'sess> {
// The complete cache data in serialized form.
- serialized_data: Vec<u8>,
+ serialized_data: RwLock<Option<Mmap>>,
// Collects all `QuerySideEffects` created during the current compilation
// session.
}
impl<'sess> rustc_middle::ty::OnDiskCache<'sess> for OnDiskCache<'sess> {
- fn new(sess: &'sess Session, data: Vec<u8>, start_pos: usize) -> Self {
+ /// Creates a new `OnDiskCache` instance from the serialized data in `data`.
+ fn new(sess: &'sess Session, data: Mmap, start_pos: usize) -> Self {
debug_assert!(sess.opts.incremental.is_some());
// Wrap in a scope so we can borrow `data`.
};
Self {
- serialized_data: data,
+ serialized_data: RwLock::new(Some(data)),
file_index_to_stable_id: footer.file_index_to_stable_id,
file_index_to_file: Default::default(),
cnum_map: OnceCell::new(),
fn new_empty(source_map: &'sess SourceMap) -> Self {
Self {
- serialized_data: Vec::new(),
+ serialized_data: RwLock::new(None),
file_index_to_stable_id: Default::default(),
file_index_to_file: Default::default(),
cnum_map: OnceCell::new(),
}
}
- fn serialize(&self, tcx: TyCtxt<'sess>, encoder: &mut FileEncoder) -> FileEncodeResult {
+ /// Execute all cache promotions and release the serialized backing Mmap.
+ ///
+ /// Cache promotions require invoking queries, which needs to read the serialized data.
+ /// In order to serialize the new on-disk cache, the former on-disk cache file needs to be
+ /// deleted, hence we won't be able to refer to its memmapped data.
+ fn drop_serialized_data(&self, tcx: TyCtxt<'tcx>) {
+ // Register any dep nodes that we reused from the previous session,
+ // but didn't `DepNode::construct` in this session. This ensures
+ // that their `DefPathHash` to `RawDefId` mappings are registered
+ // in 'latest_foreign_def_path_hashes' if necessary, since that
+ // normally happens in `DepNode::construct`.
+ tcx.dep_graph.register_reused_dep_nodes(tcx);
+
+ // Load everything into memory so we can write it out to the on-disk
+ // cache. The vast majority of cacheable query results should already
+ // be in memory, so this should be a cheap operation.
+ // Do this *before* we clone 'latest_foreign_def_path_hashes', since
+ // loading existing queries may cause us to create new DepNodes, which
+ // may in turn end up invoking `store_foreign_def_id_hash`
+ tcx.dep_graph.exec_cache_promotions(QueryCtxt::from_tcx(tcx));
+
+ *self.serialized_data.write() = None;
+ }
+
+ fn serialize<'tcx>(&self, tcx: TyCtxt<'tcx>, encoder: &mut FileEncoder) -> FileEncodeResult {
// Serializing the `DepGraph` should not modify it.
tcx.dep_graph.with_ignore(|| {
// Allocate `SourceFileIndex`es.
(file_to_file_index, file_index_to_stable_id)
};
- // Register any dep nodes that we reused from the previous session,
- // but didn't `DepNode::construct` in this session. This ensures
- // that their `DefPathHash` to `RawDefId` mappings are registered
- // in 'latest_foreign_def_path_hashes' if necessary, since that
- // normally happens in `DepNode::construct`.
- tcx.dep_graph.register_reused_dep_nodes(tcx);
-
- // Load everything into memory so we can write it out to the on-disk
- // cache. The vast majority of cacheable query results should already
- // be in memory, so this should be a cheap operation.
- // Do this *before* we clone 'latest_foreign_def_path_hashes', since
- // loading existing queries may cause us to create new DepNodes, which
- // may in turn end up invoking `store_foreign_def_id_hash`
- tcx.dep_graph.exec_cache_promotions(QueryCtxt::from_tcx(tcx));
-
let latest_foreign_def_path_hashes = self.latest_foreign_def_path_hashes.lock().clone();
let hygiene_encode_context = HygieneEncodeContext::default();
})
}
- fn with_decoder<'a, 'tcx, T, F: FnOnce(&mut CacheDecoder<'sess, 'tcx>) -> T>(
+ fn with_decoder<'a, 'tcx, T, F: for<'s> FnOnce(&mut CacheDecoder<'s, 'tcx>) -> T>(
&'sess self,
tcx: TyCtxt<'tcx>,
pos: AbsoluteBytePos,
{
let cnum_map = self.cnum_map.get_or_init(|| Self::compute_cnum_map(tcx));
+ let serialized_data = self.serialized_data.read();
let mut decoder = CacheDecoder {
tcx,
- opaque: opaque::Decoder::new(&self.serialized_data[..], pos.to_usize()),
+ opaque: opaque::Decoder::new(serialized_data.as_deref().unwrap_or(&[]), pos.to_usize()),
source_map: self.source_map,
cnum_map,
file_index_to_file: &self.file_index_to_file,
};
}
+macro_rules! map_from_iter_rand_bench {
+ ($name: ident, $n: expr, $map: ident) => {
+ #[bench]
+ pub fn $name(b: &mut Bencher) {
+ let n: usize = $n;
+ // setup
+ let mut rng = thread_rng();
+ let mut vec = Vec::with_capacity(n);
+
+ for _ in 0..n {
+ let i = rng.gen::<usize>() % n;
+ vec.push((i, i));
+ }
+
+ // measure
+ b.iter(|| {
+ let map: $map<_, _> = vec.iter().copied().collect();
+ black_box(map);
+ });
+ }
+ };
+}
+
+macro_rules! map_from_iter_seq_bench {
+ ($name: ident, $n: expr, $map: ident) => {
+ #[bench]
+ pub fn $name(b: &mut Bencher) {
+ let n: usize = $n;
+ // setup
+ let mut vec = Vec::with_capacity(n);
+
+ for i in 0..n {
+ vec.push((i, i));
+ }
+
+ // measure
+ b.iter(|| {
+ let map: $map<_, _> = vec.iter().copied().collect();
+ black_box(map);
+ });
+ }
+ };
+}
+
macro_rules! map_find_rand_bench {
($name: ident, $n: expr, $map: ident) => {
#[bench]
map_insert_seq_bench! {insert_seq_100, 100, BTreeMap}
map_insert_seq_bench! {insert_seq_10_000, 10_000, BTreeMap}
+map_from_iter_rand_bench! {from_iter_rand_100, 100, BTreeMap}
+map_from_iter_rand_bench! {from_iter_rand_10_000, 10_000, BTreeMap}
+
+map_from_iter_seq_bench! {from_iter_seq_100, 100, BTreeMap}
+map_from_iter_seq_bench! {from_iter_seq_10_000, 10_000, BTreeMap}
+
map_find_rand_bench! {find_rand_100, 100, BTreeMap}
map_find_rand_bench! {find_rand_10_000, 10_000, BTreeMap}
--- /dev/null
+use core::iter::Peekable;
+
+/// A iterator for deduping the key of a sorted iterator.
+/// When encountering the duplicated key, only the last key-value pair is yielded.
+///
+/// Used by [`BTreeMap::bulk_build_from_sorted_iter`].
+pub struct DedupSortedIter<K, V, I>
+where
+ I: Iterator<Item = (K, V)>,
+{
+ iter: Peekable<I>,
+}
+
+impl<K, V, I> DedupSortedIter<K, V, I>
+where
+ I: Iterator<Item = (K, V)>,
+{
+ pub fn new(iter: I) -> Self {
+ Self { iter: iter.peekable() }
+ }
+}
+
+impl<K, V, I> Iterator for DedupSortedIter<K, V, I>
+where
+ K: Eq,
+ I: Iterator<Item = (K, V)>,
+{
+ type Item = (K, V);
+
+ fn next(&mut self) -> Option<(K, V)> {
+ loop {
+ let next = match self.iter.next() {
+ Some(next) => next,
+ None => return None,
+ };
+
+ let peeked = match self.iter.peek() {
+ Some(peeked) => peeked,
+ None => return Some(next),
+ };
+
+ if next.0 != peeked.0 {
+ return Some(next);
+ }
+ }
+ }
+}
+use crate::vec::Vec;
use core::borrow::Borrow;
use core::cmp::Ordering;
use core::fmt::{self, Debug};
use core::ptr;
use super::borrow::DormantMutRef;
+use super::dedup_sorted_iter::DedupSortedIter;
use super::navigate::{LazyLeafRange, LeafRange};
use super::node::{self, marker, ForceResult::*, Handle, NodeRef, Root};
use super::search::SearchResult::*;
pub fn into_values(self) -> IntoValues<K, V> {
IntoValues { inner: self.into_iter() }
}
+
+ /// Makes a `BTreeMap` from a sorted iterator.
+ pub(crate) fn bulk_build_from_sorted_iter<I>(iter: I) -> Self
+ where
+ K: Ord,
+ I: Iterator<Item = (K, V)>,
+ {
+ let mut root = Root::new();
+ let mut length = 0;
+ root.bulk_push(DedupSortedIter::new(iter), &mut length);
+ BTreeMap { root: Some(root), length }
+ }
}
#[stable(feature = "rust1", since = "1.0.0")]
#[stable(feature = "rust1", since = "1.0.0")]
impl<K: Ord, V> FromIterator<(K, V)> for BTreeMap<K, V> {
fn from_iter<T: IntoIterator<Item = (K, V)>>(iter: T) -> BTreeMap<K, V> {
- let mut map = BTreeMap::new();
- map.extend(iter);
- map
+ let mut inputs: Vec<_> = iter.into_iter().collect();
+
+ if inputs.is_empty() {
+ return BTreeMap::new();
+ }
+
+ // use stable sort to preserve the insertion order.
+ inputs.sort_by(|a, b| a.0.cmp(&b.0));
+ BTreeMap::bulk_build_from_sorted_iter(inputs.into_iter())
}
}
/// let map2: BTreeMap<_, _> = [(1, 2), (3, 4)].into();
/// assert_eq!(map1, map2);
/// ```
- fn from(arr: [(K, V); N]) -> Self {
- core::array::IntoIter::new(arr).collect()
+ fn from(mut arr: [(K, V); N]) -> Self {
+ if N == 0 {
+ return BTreeMap::new();
+ }
+
+ // use stable sort to preserve the insertion order.
+ arr.sort_by(|a, b| a.0.cmp(&b.0));
+ BTreeMap::bulk_build_from_sorted_iter(core::array::IntoIter::new(arr))
}
}
mod append;
mod borrow;
+mod dedup_sorted_iter;
mod fix;
pub mod map;
mod mem;
const PERMITS_TRAVERSAL: bool = true;
}
impl BorrowType for Owned {
- // Traversal isn't needede, it happens using the result of `borrow_mut`.
+ // Traversal isn't needed, it happens using the result of `borrow_mut`.
// By disabling traversal, and only creating new references to roots,
// we know that every reference of the `Owned` type is to a root node.
const PERMITS_TRAVERSAL: bool = false;
// This is pretty much entirely stolen from TreeSet, since BTreeMap has an identical interface
// to TreeMap
+use crate::vec::Vec;
use core::borrow::Borrow;
use core::cmp::Ordering::{Equal, Greater, Less};
use core::cmp::{max, min};
#[stable(feature = "rust1", since = "1.0.0")]
impl<T: Ord> FromIterator<T> for BTreeSet<T> {
fn from_iter<I: IntoIterator<Item = T>>(iter: I) -> BTreeSet<T> {
- let mut set = BTreeSet::new();
- set.extend(iter);
- set
+ let mut inputs: Vec<_> = iter.into_iter().collect();
+
+ if inputs.is_empty() {
+ return BTreeSet::new();
+ }
+
+ // use stable sort to preserve the insertion order.
+ inputs.sort();
+ let iter = inputs.into_iter().map(|k| (k, ()));
+ let map = BTreeMap::bulk_build_from_sorted_iter(iter);
+ BTreeSet { map }
}
}
/// let set2: BTreeSet<_> = [1, 2, 3, 4].into();
/// assert_eq!(set1, set2);
/// ```
- fn from(arr: [T; N]) -> Self {
- core::array::IntoIter::new(arr).collect()
+ fn from(mut arr: [T; N]) -> Self {
+ if N == 0 {
+ return BTreeSet::new();
+ }
+
+ // use stable sort to preserve the insertion order.
+ arr.sort();
+ let iter = core::array::IntoIter::new(arr).map(|k| (k, ()));
+ let map = BTreeMap::bulk_build_from_sorted_iter(iter);
+ BTreeSet { map }
}
}
}
}
-/// Creates a new file symbolic link on the filesystem.
+/// Creates a new symlink to a non-directory file on the filesystem.
///
/// The `link` path will be a file symbolic link pointing to the `original`
/// path.
///
+/// The `original` path should not be a directory or a symlink to a directory,
+/// otherwise the symlink will be broken. Use [`symlink_dir`] for directories.
+///
+/// This function currently corresponds to [`CreateSymbolicLinkW`][CreateSymbolicLinkW].
+/// Note that this [may change in the future][changes].
+///
+/// [CreateSymbolicLinkW]: https://docs.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-createsymboliclinkw
+/// [changes]: io#platform-specific-behavior
+///
/// # Examples
///
/// ```no_run
sys::fs::symlink_inner(original.as_ref(), link.as_ref(), false)
}
-/// Creates a new directory symlink on the filesystem.
+/// Creates a new symlink to a directory on the filesystem.
///
/// The `link` path will be a directory symbolic link pointing to the `original`
/// path.
///
+/// The `original` path must be a directory or a symlink to a directory,
+/// otherwise the symlink will be broken. Use [`symlink_file`] for other files.
+///
+/// This function currently corresponds to [`CreateSymbolicLinkW`][CreateSymbolicLinkW].
+/// Note that this [may change in the future][changes].
+///
+/// [CreateSymbolicLinkW]: https://docs.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-createsymboliclinkw
+/// [changes]: io#platform-specific-behavior
+///
/// # Examples
///
/// ```no_run
import datetime
import distutils.version
import hashlib
+import json
import os
import re
import shutil
except tarfile.CompressionError:
return False
-def get(url, path, verbose=False, do_verify=True):
- suffix = '.sha256'
- sha_url = url + suffix
+def get(base, url, path, checksums, verbose=False, do_verify=True):
with tempfile.NamedTemporaryFile(delete=False) as temp_file:
temp_path = temp_file.name
- with tempfile.NamedTemporaryFile(suffix=suffix, delete=False) as sha_file:
- sha_path = sha_file.name
try:
if do_verify:
- download(sha_path, sha_url, False, verbose)
+ if url not in checksums:
+ raise RuntimeError("src/stage0.json doesn't contain a checksum for {}".format(url))
+ sha256 = checksums[url]
if os.path.exists(path):
- if verify(path, sha_path, False):
+ if verify(path, sha256, False):
if verbose:
print("using already-download file", path)
return
print("ignoring already-download file",
path, "due to failed verification")
os.unlink(path)
- download(temp_path, url, True, verbose)
- if do_verify and not verify(temp_path, sha_path, verbose):
+ download(temp_path, "{}/{}".format(base, url), True, verbose)
+ if do_verify and not verify(temp_path, sha256, verbose):
raise RuntimeError("failed verification")
if verbose:
print("moving {} to {}".format(temp_path, path))
shutil.move(temp_path, path)
finally:
- delete_if_present(sha_path, verbose)
- delete_if_present(temp_path, verbose)
-
-
-def delete_if_present(path, verbose):
- """Remove the given file if present"""
- if os.path.isfile(path):
- if verbose:
- print("removing", path)
- os.unlink(path)
+ if os.path.isfile(temp_path):
+ if verbose:
+ print("removing", temp_path)
+ os.unlink(temp_path)
def download(path, url, probably_big, verbose):
exception=exception)
-def verify(path, sha_path, verbose):
+def verify(path, expected, verbose):
"""Check if the sha256 sum of the given path is valid"""
if verbose:
print("verifying", path)
with open(path, "rb") as source:
found = hashlib.sha256(source.read()).hexdigest()
- with open(sha_path, "r") as sha256sum:
- expected = sha256sum.readline().split()[0]
verified = found == expected
if not verified:
print("invalid checksum:\n"
sys.exit(1)
-def stage0_data(rust_root):
- """Build a dictionary from stage0.txt"""
- nightlies = os.path.join(rust_root, "src/stage0.txt")
- with open(nightlies, 'r') as nightlies:
- lines = [line.rstrip() for line in nightlies
- if not line.startswith("#")]
- return dict([line.split(": ", 1) for line in lines if line])
-
-
def format_build_time(duration):
"""Return a nicer format for build time
os.rename(tmp, filepath)
+class Stage0Toolchain:
+ def __init__(self, stage0_payload):
+ self.date = stage0_payload["date"]
+ self.version = stage0_payload["version"]
+
+ def channel(self):
+ return self.version + "-" + self.date
+
+
class RustBuild(object):
"""Provide all the methods required to build Rust"""
def __init__(self):
- self.date = ''
+ self.checksums_sha256 = {}
+ self.stage0_compiler = None
+ self.stage0_rustfmt = None
self._download_url = ''
- self.rustc_channel = ''
- self.rustfmt_channel = ''
self.build = ''
self.build_dir = ''
self.clean = False
will move all the content to the right place.
"""
if rustc_channel is None:
- rustc_channel = self.rustc_channel
- rustfmt_channel = self.rustfmt_channel
+ rustc_channel = self.stage0_compiler.version
bin_root = self.bin_root(stage0)
- key = self.date
+ key = self.stage0_compiler.date
if not stage0:
key += str(self.rustc_commit)
if self.rustc(stage0).startswith(bin_root) and \
if self.rustfmt() and self.rustfmt().startswith(bin_root) and (
not os.path.exists(self.rustfmt())
- or self.program_out_of_date(self.rustfmt_stamp(), self.rustfmt_channel)
+ or self.program_out_of_date(
+ self.rustfmt_stamp(),
+ "" if self.stage0_rustfmt is None else self.stage0_rustfmt.channel()
+ )
):
- if rustfmt_channel:
+ if self.stage0_rustfmt is not None:
tarball_suffix = '.tar.xz' if support_xz() else '.tar.gz'
- [channel, date] = rustfmt_channel.split('-', 1)
- filename = "rustfmt-{}-{}{}".format(channel, self.build, tarball_suffix)
+ filename = "rustfmt-{}-{}{}".format(
+ self.stage0_rustfmt.version, self.build, tarball_suffix,
+ )
self._download_component_helper(
- filename, "rustfmt-preview", tarball_suffix, key=date
+ filename, "rustfmt-preview", tarball_suffix, key=self.stage0_rustfmt.date
)
self.fix_bin_or_dylib("{}/bin/rustfmt".format(bin_root))
self.fix_bin_or_dylib("{}/bin/cargo-fmt".format(bin_root))
with output(self.rustfmt_stamp()) as rustfmt_stamp:
- rustfmt_stamp.write(self.rustfmt_channel)
+ rustfmt_stamp.write(self.stage0_rustfmt.channel())
# Avoid downloading LLVM twice (once for stage0 and once for the master rustc)
if self.downloading_llvm() and stage0:
):
if key is None:
if stage0:
- key = self.date
+ key = self.stage0_compiler.date
else:
key = self.rustc_commit
cache_dst = os.path.join(self.build_dir, "cache")
os.makedirs(rustc_cache)
if stage0:
- url = "{}/dist/{}".format(self._download_url, key)
+ base = self._download_url
+ url = "dist/{}".format(key)
else:
- url = "https://ci-artifacts.rust-lang.org/rustc-builds/{}".format(self.rustc_commit)
+ base = "https://ci-artifacts.rust-lang.org"
+ url = "rustc-builds/{}".format(self.rustc_commit)
tarball = os.path.join(rustc_cache, filename)
if not os.path.exists(tarball):
- get("{}/{}".format(url, filename), tarball, verbose=self.verbose, do_verify=stage0)
+ get(
+ base,
+ "{}/{}".format(url, filename),
+ tarball,
+ self.checksums_sha256,
+ verbose=self.verbose,
+ do_verify=stage0,
+ )
unpack(tarball, tarball_suffix, self.bin_root(stage0), match=pattern, verbose=self.verbose)
def _download_ci_llvm(self, llvm_sha, llvm_assertions):
if not os.path.exists(rustc_cache):
os.makedirs(rustc_cache)
- url = "https://ci-artifacts.rust-lang.org/rustc-builds/{}".format(llvm_sha)
+ base = "https://ci-artifacts.rust-lang.org"
+ url = "rustc-builds/{}".format(llvm_sha)
if llvm_assertions:
url = url.replace('rustc-builds', 'rustc-builds-alt')
# ci-artifacts are only stored as .xz, not .gz
filename = "rust-dev-nightly-" + self.build + tarball_suffix
tarball = os.path.join(rustc_cache, filename)
if not os.path.exists(tarball):
- get("{}/{}".format(url, filename), tarball, verbose=self.verbose, do_verify=False)
+ get(
+ base,
+ "{}/{}".format(url, filename),
+ tarball,
+ self.checksums_sha256,
+ verbose=self.verbose,
+ do_verify=False,
+ )
unpack(tarball, tarball_suffix, self.llvm_root(),
match="rust-dev",
verbose=self.verbose)
def rustfmt(self):
"""Return config path for rustfmt"""
- if not self.rustfmt_channel:
+ if self.stage0_rustfmt is None:
return None
return self.program_config('rustfmt')
self.update_submodule(module[0], module[1], recorded_submodules)
print("Submodules updated in %.2f seconds" % (time() - start_time))
- def set_normal_environment(self):
+ def set_dist_environment(self, url):
"""Set download URL for normal environment"""
if 'RUSTUP_DIST_SERVER' in os.environ:
self._download_url = os.environ['RUSTUP_DIST_SERVER']
else:
- self._download_url = 'https://static.rust-lang.org'
-
- def set_dev_environment(self):
- """Set download URL for development environment"""
- if 'RUSTUP_DEV_DIST_SERVER' in os.environ:
- self._download_url = os.environ['RUSTUP_DEV_DIST_SERVER']
- else:
- self._download_url = 'https://dev-static.rust-lang.org'
+ self._download_url = url
def check_vendored_status(self):
"""Check that vendoring is configured properly"""
build_dir = build.get_toml('build-dir', 'build') or 'build'
build.build_dir = os.path.abspath(build_dir.replace("$ROOT", build.rust_root))
- data = stage0_data(build.rust_root)
- build.date = data['date']
- build.rustc_channel = data['rustc']
-
- if "rustfmt" in data:
- build.rustfmt_channel = data['rustfmt']
+ with open(os.path.join(build.rust_root, "src", "stage0.json")) as f:
+ data = json.load(f)
+ build.checksums_sha256 = data["checksums_sha256"]
+ build.stage0_compiler = Stage0Toolchain(data["compiler"])
+ if data.get("rustfmt") is not None:
+ build.stage0_rustfmt = Stage0Toolchain(data["rustfmt"])
- if 'dev' in data:
- build.set_dev_environment()
- else:
- build.set_normal_environment()
+ build.set_dist_environment(data["dist_server"])
build.build = args.build or build.build_triple()
build.update_submodules()
import bootstrap
-class Stage0DataTestCase(unittest.TestCase):
- """Test Case for stage0_data"""
- def setUp(self):
- self.rust_root = tempfile.mkdtemp()
- os.mkdir(os.path.join(self.rust_root, "src"))
- with open(os.path.join(self.rust_root, "src",
- "stage0.txt"), "w") as stage0:
- stage0.write("#ignore\n\ndate: 2017-06-15\nrustc: beta\ncargo: beta\nrustfmt: beta")
-
- def tearDown(self):
- rmtree(self.rust_root)
-
- def test_stage0_data(self):
- """Extract data from stage0.txt"""
- expected = {"date": "2017-06-15", "rustc": "beta", "cargo": "beta", "rustfmt": "beta"}
- data = bootstrap.stage0_data(self.rust_root)
- self.assertDictEqual(data, expected)
-
-
class VerifyTestCase(unittest.TestCase):
"""Test Case for verify"""
def setUp(self):
self.container = tempfile.mkdtemp()
self.src = os.path.join(self.container, "src.txt")
- self.sums = os.path.join(self.container, "sums")
self.bad_src = os.path.join(self.container, "bad.txt")
content = "Hello world"
+ self.expected = hashlib.sha256(content.encode("utf-8")).hexdigest()
+
with open(self.src, "w") as src:
src.write(content)
- with open(self.sums, "w") as sums:
- sums.write(hashlib.sha256(content.encode("utf-8")).hexdigest())
with open(self.bad_src, "w") as bad:
bad.write("Hello!")
def test_valid_file(self):
"""Check if the sha256 sum of the given file is valid"""
- self.assertTrue(bootstrap.verify(self.src, self.sums, False))
+ self.assertTrue(bootstrap.verify(self.src, self.expected, False))
def test_invalid_file(self):
"""Should verify that the file is invalid"""
- self.assertFalse(bootstrap.verify(self.bad_src, self.sums, False))
+ self.assertFalse(bootstrap.verify(self.bad_src, self.expected, False))
class ProgramOutOfDate(unittest.TestCase):
TEST_LOADER = unittest.TestLoader()
SUITE.addTest(doctest.DocTestSuite(bootstrap))
SUITE.addTests([
- TEST_LOADER.loadTestsFromTestCase(Stage0DataTestCase),
TEST_LOADER.loadTestsFromTestCase(VerifyTestCase),
TEST_LOADER.loadTestsFromTestCase(ProgramOutOfDate)])
install::Src,
install::Rustc
),
- Kind::Run => describe!(run::ExpandYamlAnchors, run::BuildManifest),
+ Kind::Run => describe!(run::ExpandYamlAnchors, run::BuildManifest, run::BumpStage0),
}
}
//! When you execute `x.py build`, the steps executed are:
//!
//! * First, the python script is run. This will automatically download the
-//! stage0 rustc and cargo according to `src/stage0.txt`, or use the cached
+//! stage0 rustc and cargo according to `src/stage0.json`, or use the cached
//! versions if they're available. These are then used to compile rustbuild
//! itself (using Cargo). Finally, control is then transferred to rustbuild.
//!
builder.run(&mut cmd);
}
}
+
+#[derive(Debug, PartialOrd, Ord, Copy, Clone, Hash, PartialEq, Eq)]
+pub struct BumpStage0;
+
+impl Step for BumpStage0 {
+ type Output = ();
+ const ONLY_HOSTS: bool = true;
+
+ fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
+ run.path("src/tools/bump-stage0")
+ }
+
+ fn make_run(run: RunConfig<'_>) {
+ run.builder.ensure(BumpStage0);
+ }
+
+ fn run(self, builder: &Builder<'_>) -> Self::Output {
+ let mut cmd = builder.tool_cmd(Tool::BumpStage0);
+ builder.run(&mut cmd);
+ }
+}
use std::path::PathBuf;
use std::process::Command;
-use build_helper::{output, t};
+use build_helper::output;
use crate::cache::INTERNER;
use crate::config::Target;
if let Some(ref s) = build.config.ccache {
cmd_finder.must_have(s);
}
-
- if build.config.channel == "stable" {
- let stage0 = t!(fs::read_to_string(build.src.join("src/stage0.txt")));
- if stage0.contains("\ndev:") {
- panic!(
- "bootstrapping from a dev compiler in a stable release, but \
- should only be bootstrapping from a released compiler!"
- );
- }
- }
}
LintDocs, "src/tools/lint-docs", "lint-docs";
JsonDocCk, "src/tools/jsondocck", "jsondocck";
HtmlChecker, "src/tools/html-checker", "html-checker";
+ BumpStage0, "src/tools/bump-stage0", "bump-stage0";
);
#[derive(Debug, Copy, Clone, Hash, PartialEq, Eq, Ord, PartialOrd)]
--- /dev/null
+{
+ "__comment": "Generated by `./x.py run src/tools/bump-stage0`. Run that command again to update the bootstrap compiler.",
+ "dist_server": "https://static.rust-lang.org",
+ "compiler": {
+ "date": "2021-08-22",
+ "version": "beta"
+ },
+ "rustfmt": {
+ "date": "2021-08-26",
+ "version": "nightly"
+ },
+ "checksums_sha256": {
+ "dist/2021-08-22/cargo-beta-aarch64-apple-darwin.tar.gz": "1aae6206b6ee057a53c6863d1aa9246a913bd8cc87945221ffe25a0763198ec9",
+ "dist/2021-08-22/cargo-beta-aarch64-apple-darwin.tar.xz": "9bb4026714d46f99077c4ec2ac1f818a059252996077569339a72704a1044cc5",
+ "dist/2021-08-22/cargo-beta-aarch64-pc-windows-msvc.tar.gz": "127a066958fe2f67154ae5e5ffdf67e216cd9da5c8ca7f6f5818017ef647eb57",
+ "dist/2021-08-22/cargo-beta-aarch64-pc-windows-msvc.tar.xz": "f62459d78c012d129a38f9f05975f784ca59f613cb77f273ac1be992320968ca",
+ "dist/2021-08-22/cargo-beta-aarch64-unknown-linux-gnu.tar.gz": "eb0e5765d0d37129a1e70680cb701fc7968baf98a183a25fbe495d5e1818a67c",
+ "dist/2021-08-22/cargo-beta-aarch64-unknown-linux-gnu.tar.xz": "8168902da36e32c2b2946ec18d41c4877191e3b5ec95276d85a1453541be8adf",
+ "dist/2021-08-22/cargo-beta-aarch64-unknown-linux-musl.tar.gz": "e8a774fd383d0a7a3a1216ebd3a005fe01560002c8a28b89ce7f9a0ac522a07f",
+ "dist/2021-08-22/cargo-beta-aarch64-unknown-linux-musl.tar.xz": "da7e246ca883ace9f9006257dd52756395307613f2bc10d86bacfe9b24f861c8",
+ "dist/2021-08-22/cargo-beta-arm-unknown-linux-gnueabi.tar.gz": "bc20e1ffe92aeca2a01bab6b1e383dfd7cecde01780bb2369ef5e10ef6e88bc7",
+ "dist/2021-08-22/cargo-beta-arm-unknown-linux-gnueabi.tar.xz": "5020ad70b694f18fa19be09d86983a7f396b38d71a65cf061438870d9264de45",
+ "dist/2021-08-22/cargo-beta-arm-unknown-linux-gnueabihf.tar.gz": "53792dbfd932874bc7be8cf6683e5fa318afe9e59a3069f1c82279d9b66edcfd",
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+ "dist/2021-08-22/cargo-beta-i686-pc-windows-gnu.tar.xz": "ddfe1cee4f7d8a451ff5d1eb880c3e9ffa3fa1e59a8c12322e46562e379101de",
+ "dist/2021-08-22/cargo-beta-i686-pc-windows-msvc.tar.gz": "33d5d918ae8d35ecc760bf876573a51d62c98a46eb6c60c2e3ba8acba4ce6488",
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+ "dist/2021-08-22/cargo-beta-i686-unknown-linux-gnu.tar.xz": "65f860c74140318eb5c034a04c85e3eabfb31dfa8d70791d701f15d979d50361",
+ "dist/2021-08-22/cargo-beta-mips-unknown-linux-gnu.tar.gz": "034e491668d0f55b1fba9d606c2acb2d7d1d00db528f141207202ec6e5ca4410",
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+ "dist/2021-08-22/cargo-beta-powerpc-unknown-linux-gnu.tar.gz": "4f6326173b50952d933b02cc477156d5aad067798b347ce502889e607e98c84c",
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+ "dist/2021-08-22/cargo-beta-x86_64-apple-darwin.tar.gz": "bccb3002b5cc3556555bb05208b7d64b9aee3a7dc3b482c03090ad0102c22570",
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+ }
+}
+++ /dev/null
-# This file describes the stage0 compiler that's used to then bootstrap the Rust
-# compiler itself.
-#
-# Currently Rust always bootstraps from the previous stable release, and in our
-# train model this means that the master branch bootstraps from beta, beta
-# bootstraps from current stable, and stable bootstraps from the previous stable
-# release.
-#
-# If you're looking at this file on the master branch, you'll likely see that
-# rustc is configured to `beta`, whereas if you're looking at a source tarball
-# for a stable release you'll likely see `1.x.0` for rustc, with the previous
-# stable release's version number. `date` is the date where the release we're
-# bootstrapping off was released.
-
-date: 2021-07-29
-rustc: beta
-
-# We use a nightly rustfmt to format the source because it solves some
-# bootstrapping issues with use of new syntax in this repo. If you're looking at
-# the beta/stable branch, this key should be omitted, as we don't want to depend
-# on rustfmt from nightly there.
-rustfmt: nightly-2021-03-25
-
-# When making a stable release the process currently looks like:
-#
-# 1. Produce stable build, upload it to dev-static
-# 2. Produce a beta build from the previous stable build, upload to static
-# 3. Produce a nightly build from previous beta, upload to static
-# 4. Upload stable build to static, publish full release
-#
-# This means that there's a small window of time (a few days) where artifacts
-# are downloaded from dev-static.rust-lang.org instead of static.rust-lang.org.
-# In order to ease this transition we have an extra key which is in the
-# configuration file below. When uncommented this will instruct the bootstrap.py
-# script to download from dev-static.rust-lang.org.
-#
-# This key is typically commented out at all times. If you're looking at a
-# stable release tarball it should *definitely* be commented out. If you're
-# looking at a beta source tarball and it's uncommented we'll shortly comment it
-# out.
-
-#dev: 1
--- /dev/null
+#![feature(generic_const_exprs, array_map)]
+#![allow(incomplete_features)]
+
+pub struct ConstCheck<const CHECK: bool>;
+
+pub trait True {}
+impl True for ConstCheck<true> {}
+
+pub trait OrdesDec {
+ type Newlen;
+ type Output;
+
+ fn pop(self) -> (Self::Newlen, Self::Output);
+}
+
+impl<T, const N: usize> OrdesDec for [T; N]
+where
+ ConstCheck<{N > 1}>: True,
+ [T; N - 1]: Sized,
+{
+ type Newlen = [T; N - 1];
+ type Output = T;
+
+ fn pop(self) -> (Self::Newlen, Self::Output) {
+ let mut iter = IntoIter::new(self);
+ //~^ ERROR: failed to resolve: use of undeclared type `IntoIter`
+ let end = iter.next_back().unwrap();
+ let new = [(); N - 1].map(move |()| iter.next().unwrap());
+ (new, end)
+ }
+}
+
+fn main() {}
--- /dev/null
+error[E0433]: failed to resolve: use of undeclared type `IntoIter`
+ --> $DIR/issue-82956.rs:25:24
+ |
+LL | let mut iter = IntoIter::new(self);
+ | ^^^^^^^^ not found in this scope
+ |
+help: consider importing one of these items
+ |
+LL | use std::array::IntoIter;
+ |
+LL | use std::collections::binary_heap::IntoIter;
+ |
+LL | use std::collections::btree_map::IntoIter;
+ |
+LL | use std::collections::btree_set::IntoIter;
+ |
+ and 8 other candidates
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0433`.
--- /dev/null
+#![allow(incomplete_features)]
+#![feature(generic_const_exprs)]
+
+trait Bar<const N: usize> {}
+
+trait Foo<'a> {
+ const N: usize;
+ type Baz: Bar<{ Self::N }>;
+ //~^ ERROR: unconstrained generic constant
+}
+
+fn main() {}
--- /dev/null
+error: unconstrained generic constant
+ --> $DIR/issue-84659.rs:8:15
+ |
+LL | type Baz: Bar<{ Self::N }>;
+ | ^^^^^^^^^^^^^^^^
+ |
+ = help: try adding a `where` bound using this expression: `where [(); { Self::N }]:`
+
+error: aborting due to previous error
+
--- /dev/null
+#![feature(generic_const_exprs)]
+#![allow(incomplete_features)]
+
+pub trait X {
+ const Y: usize;
+}
+
+fn z<T>(t: T)
+where
+ T: X,
+ [(); T::Y]: ,
+{
+}
+
+fn unit_literals() {
+ z(" ");
+ //~^ ERROR: the trait bound `&str: X` is not satisfied
+}
+
+fn main() {}
--- /dev/null
+error[E0277]: the trait bound `&str: X` is not satisfied
+ --> $DIR/issue-86530.rs:16:7
+ |
+LL | z(" ");
+ | ^^^ the trait `X` is not implemented for `&str`
+ |
+note: required by a bound in `z`
+ --> $DIR/issue-86530.rs:10:8
+ |
+LL | fn z<T>(t: T)
+ | - required by a bound in this
+LL | where
+LL | T: X,
+ | ^ required by this bound in `z`
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0277`.
--- /dev/null
+// run-pass
+#![feature(adt_const_params, generic_const_exprs)]
+#![allow(incomplete_features)]
+
+pub trait Foo {
+ const ASSOC_C: usize;
+ fn foo() where [(); Self::ASSOC_C]:;
+}
+
+struct Bar<const N: &'static ()>;
+impl<const N: &'static ()> Foo for Bar<N> {
+ const ASSOC_C: usize = 3;
+
+ fn foo() where [u8; Self::ASSOC_C]: {
+ let _: [u8; Self::ASSOC_C] = loop {};
+ }
+}
+
+fn main() {}
--- /dev/null
+// run-pass
+#![feature(adt_const_params, generic_const_exprs)]
+#![allow(incomplete_features, unused_variables)]
+
+struct F<const S: &'static str>;
+impl<const S: &'static str> X for F<{ S }> {
+ const W: usize = 3;
+
+ fn d(r: &[u8; Self::W]) -> F<{ S }> {
+ let x: [u8; Self::W] = [0; Self::W];
+ F
+ }
+}
+
+pub trait X {
+ const W: usize;
+ fn d(r: &[u8; Self::W]) -> Self;
+}
+
+fn main() {}
--- /dev/null
+trait Trait<const N: usize> {
+ const Assoc: usize;
+}
+
+impl<const N: usize> Trait<N> for () {
+ const Assoc: usize = 1;
+}
+
+
+pub const fn foo<const N: usize>() where (): Trait<N> {
+ let bar = [(); <()>::Assoc];
+ //~^ error: constant expression depends on a generic parameter
+}
+
+trait Trait2<const N: usize> {
+ const Assoc2: usize;
+}
+
+impl<const N: usize> Trait2<N> for () {
+ const Assoc2: usize = N - 1;
+}
+
+
+pub const fn foo2<const N: usize>() where (): Trait2<N> {
+ let bar2 = [(); <()>::Assoc2];
+ //~^ error: constant expression depends on a generic parameter
+}
+
+fn main() {
+ foo::<0>();
+ foo2::<0>();
+}
--- /dev/null
+error: constant expression depends on a generic parameter
+ --> $DIR/sneaky-array-repeat-expr.rs:11:20
+ |
+LL | let bar = [(); <()>::Assoc];
+ | ^^^^^^^^^^^
+ |
+ = note: this may fail depending on what value the parameter takes
+
+error: constant expression depends on a generic parameter
+ --> $DIR/sneaky-array-repeat-expr.rs:25:21
+ |
+LL | let bar2 = [(); <()>::Assoc2];
+ | ^^^^^^^^^^^^
+ |
+ = note: this may fail depending on what value the parameter takes
+
+error: aborting due to 2 previous errors
+
// arms whose patterns were composed solely of constants to not have
// them linked in the cfg.
//
-// THis was broken for various reasons. In particular, that hack was
+// This was broken for various reasons. In particular, that hack was
// originally authored under the assunption that other checks
// elsewhere would ensure that the two patterns did not overlap. But
// that assumption did not hold, at least not in the long run (namely,
--- /dev/null
+[package]
+name = "bump-stage0"
+version = "0.1.0"
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+anyhow = "1.0.34"
+curl = "0.4.38"
+indexmap = { version = "1.7.0", features = ["serde"] }
+serde = { version = "1.0.125", features = ["derive"] }
+serde_json = "1.0.59"
+toml = "0.5.7"
--- /dev/null
+use anyhow::Error;
+use curl::easy::Easy;
+use indexmap::IndexMap;
+use std::collections::HashMap;
+use std::convert::TryInto;
+
+const DIST_SERVER: &str = "https://static.rust-lang.org";
+const COMPILER_COMPONENTS: &[&str] = &["rustc", "rust-std", "cargo"];
+const RUSTFMT_COMPONENTS: &[&str] = &["rustfmt-preview"];
+
+struct Tool {
+ channel: Channel,
+ version: [u16; 3],
+ checksums: IndexMap<String, String>,
+}
+
+impl Tool {
+ fn new() -> Result<Self, Error> {
+ let channel = match std::fs::read_to_string("src/ci/channel")?.trim() {
+ "stable" => Channel::Stable,
+ "beta" => Channel::Beta,
+ "nightly" => Channel::Nightly,
+ other => anyhow::bail!("unsupported channel: {}", other),
+ };
+
+ // Split "1.42.0" into [1, 42, 0]
+ let version = std::fs::read_to_string("src/version")?
+ .trim()
+ .split('.')
+ .map(|val| val.parse())
+ .collect::<Result<Vec<_>, _>>()?
+ .try_into()
+ .map_err(|_| anyhow::anyhow!("failed to parse version"))?;
+
+ Ok(Self { channel, version, checksums: IndexMap::new() })
+ }
+
+ fn update_json(mut self) -> Result<(), Error> {
+ std::fs::write(
+ "src/stage0.json",
+ format!(
+ "{}\n",
+ serde_json::to_string_pretty(&Stage0 {
+ comment: "Generated by `./x.py run src/tools/bump-stage0`. \
+ Run that command again to update the bootstrap compiler.",
+ dist_server: DIST_SERVER.into(),
+ compiler: self.detect_compiler()?,
+ rustfmt: self.detect_rustfmt()?,
+ checksums_sha256: {
+ // Keys are sorted here instead of beforehand because values in this map
+ // are added while filling the other struct fields just above this block.
+ self.checksums.sort_keys();
+ self.checksums
+ }
+ })?
+ ),
+ )?;
+ Ok(())
+ }
+
+ // Currently Rust always bootstraps from the previous stable release, and in our train model
+ // this means that the master branch bootstraps from beta, beta bootstraps from current stable,
+ // and stable bootstraps from the previous stable release.
+ //
+ // On the master branch the compiler version is configured to `beta` whereas if you're looking
+ // at the beta or stable channel you'll likely see `1.x.0` as the version, with the previous
+ // release's version number.
+ fn detect_compiler(&mut self) -> Result<Stage0Toolchain, Error> {
+ let channel = match self.channel {
+ Channel::Stable | Channel::Beta => {
+ // The 1.XX manifest points to the latest point release of that minor release.
+ format!("{}.{}", self.version[0], self.version[1] - 1)
+ }
+ Channel::Nightly => "beta".to_string(),
+ };
+
+ let manifest = fetch_manifest(&channel)?;
+ self.collect_checksums(&manifest, COMPILER_COMPONENTS)?;
+ Ok(Stage0Toolchain {
+ date: manifest.date,
+ version: if self.channel == Channel::Nightly {
+ "beta".to_string()
+ } else {
+ // The version field is like "1.42.0 (abcdef1234 1970-01-01)"
+ manifest.pkg["rust"]
+ .version
+ .split_once(' ')
+ .expect("invalid version field")
+ .0
+ .to_string()
+ },
+ })
+ }
+
+ /// We use a nightly rustfmt to format the source because it solves some bootstrapping issues
+ /// with use of new syntax in this repo. For the beta/stable channels rustfmt is not provided,
+ /// as we don't want to depend on rustfmt from nightly there.
+ fn detect_rustfmt(&mut self) -> Result<Option<Stage0Toolchain>, Error> {
+ if self.channel != Channel::Nightly {
+ return Ok(None);
+ }
+
+ let manifest = fetch_manifest("nightly")?;
+ self.collect_checksums(&manifest, RUSTFMT_COMPONENTS)?;
+ Ok(Some(Stage0Toolchain { date: manifest.date, version: "nightly".into() }))
+ }
+
+ fn collect_checksums(&mut self, manifest: &Manifest, components: &[&str]) -> Result<(), Error> {
+ let prefix = format!("{}/", DIST_SERVER);
+ for component in components {
+ let pkg = manifest
+ .pkg
+ .get(*component)
+ .ok_or_else(|| anyhow::anyhow!("missing component from manifest: {}", component))?;
+ for target in pkg.target.values() {
+ for pair in &[(&target.url, &target.hash), (&target.xz_url, &target.xz_hash)] {
+ if let (Some(url), Some(sha256)) = pair {
+ let url = url
+ .strip_prefix(&prefix)
+ .ok_or_else(|| {
+ anyhow::anyhow!("url doesn't start with dist server base: {}", url)
+ })?
+ .to_string();
+ self.checksums.insert(url, sha256.clone());
+ }
+ }
+ }
+ }
+ Ok(())
+ }
+}
+
+fn main() -> Result<(), Error> {
+ let tool = Tool::new()?;
+ tool.update_json()?;
+ Ok(())
+}
+
+fn fetch_manifest(channel: &str) -> Result<Manifest, Error> {
+ Ok(toml::from_slice(&http_get(&format!(
+ "{}/dist/channel-rust-{}.toml",
+ DIST_SERVER, channel
+ ))?)?)
+}
+
+fn http_get(url: &str) -> Result<Vec<u8>, Error> {
+ let mut data = Vec::new();
+ let mut handle = Easy::new();
+ handle.fail_on_error(true)?;
+ handle.url(url)?;
+ {
+ let mut transfer = handle.transfer();
+ transfer.write_function(|new_data| {
+ data.extend_from_slice(new_data);
+ Ok(new_data.len())
+ })?;
+ transfer.perform()?;
+ }
+ Ok(data)
+}
+
+#[derive(Debug, PartialEq, Eq)]
+enum Channel {
+ Stable,
+ Beta,
+ Nightly,
+}
+
+#[derive(Debug, serde::Serialize)]
+struct Stage0 {
+ #[serde(rename = "__comment")]
+ comment: &'static str,
+ dist_server: String,
+ compiler: Stage0Toolchain,
+ rustfmt: Option<Stage0Toolchain>,
+ checksums_sha256: IndexMap<String, String>,
+}
+
+#[derive(Debug, serde::Serialize)]
+struct Stage0Toolchain {
+ date: String,
+ version: String,
+}
+
+#[derive(Debug, serde::Deserialize)]
+struct Manifest {
+ date: String,
+ pkg: HashMap<String, ManifestPackage>,
+}
+
+#[derive(Debug, serde::Deserialize)]
+struct ManifestPackage {
+ version: String,
+ target: HashMap<String, ManifestTargetPackage>,
+}
+
+#[derive(Debug, serde::Deserialize)]
+struct ManifestTargetPackage {
+ available: bool,
+ url: Option<String>,
+ hash: Option<String>,
+ xz_url: Option<String>,
+ xz_hash: Option<String>,
+}
-Subproject commit 09cadcbb62a3529801d0463d9878db3f0b5060c7
+Subproject commit 7a2f1cadcd5120c44eda3596053de767cd8173a2
-Subproject commit 996300f4a061e895a339a909fddce94f68ce7d19
+Subproject commit b73b321478d3b2a98d380eb79de717e01620c4e9
projects / rust.git / commitdiff