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Auto merge of #120309 - fmease:rollup-kr7wqy6, r=fmease
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Rollup of 9 pull requests

Successful merges:

 - #114764 ([style edition 2024] Combine all delimited exprs as last argument)
 - #118326 (Add `NonZero*::count_ones`)
 - #119460 (coverage: Never emit improperly-ordered coverage regions)
 - #119616 (Add a new `wasm32-wasi-preview2` target)
 - #120185 (coverage: Don't instrument `#[automatically_derived]` functions)
 - #120265 (Remove no-system-llvm)
 - #120284 (privacy: Refactor top-level visiting in `TypePrivacyVisitor`)
 - #120285 (Remove extra # from url in suggestion)
 - #120299 (Add mw to review rotation and add some owner assignments)

r? `@ghost`
`@rustbot` modify labels: rollup
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bors committed Jan 24, 2024
2 parents cd6d8f2 + 8325f3d commit 7ffc697
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46 changes: 45 additions & 1 deletion compiler/rustc_mir_transform/src/coverage/mod.rs
Original file line number Diff line number Diff line change
Expand Up @@ -329,7 +329,7 @@ fn make_code_region(
start_line = source_map.doctest_offset_line(&file.name, start_line);
end_line = source_map.doctest_offset_line(&file.name, end_line);

Some(CodeRegion {
check_code_region(CodeRegion {
file_name,
start_line: start_line as u32,
start_col: start_col as u32,
Expand All @@ -338,6 +338,39 @@ fn make_code_region(
})
}

/// If `llvm-cov` sees a code region that is improperly ordered (end < start),
/// it will immediately exit with a fatal error. To prevent that from happening,
/// discard regions that are improperly ordered, or might be interpreted in a
/// way that makes them improperly ordered.
fn check_code_region(code_region: CodeRegion) -> Option<CodeRegion> {
let CodeRegion { file_name: _, start_line, start_col, end_line, end_col } = code_region;

// Line/column coordinates are supposed to be 1-based. If we ever emit
// coordinates of 0, `llvm-cov` might misinterpret them.
let all_nonzero = [start_line, start_col, end_line, end_col].into_iter().all(|x| x != 0);
// Coverage mappings use the high bit of `end_col` to indicate that a
// region is actually a "gap" region, so make sure it's unset.
let end_col_has_high_bit_unset = (end_col & (1 << 31)) == 0;
// If a region is improperly ordered (end < start), `llvm-cov` will exit
// with a fatal error, which is inconvenient for users and hard to debug.
let is_ordered = (start_line, start_col) <= (end_line, end_col);

if all_nonzero && end_col_has_high_bit_unset && is_ordered {
Some(code_region)
} else {
debug!(
?code_region,
?all_nonzero,
?end_col_has_high_bit_unset,
?is_ordered,
"Skipping code region that would be misinterpreted or rejected by LLVM"
);
// If this happens in a debug build, ICE to make it easier to notice.
debug_assert!(false, "Improper code region: {code_region:?}");
None
}
}

fn is_eligible_for_coverage(tcx: TyCtxt<'_>, def_id: LocalDefId) -> bool {
// Only instrument functions, methods, and closures (not constants since they are evaluated
// at compile time by Miri).
Expand All @@ -351,7 +384,18 @@ fn is_eligible_for_coverage(tcx: TyCtxt<'_>, def_id: LocalDefId) -> bool {
return false;
}

// Don't instrument functions with `#[automatically_derived]` on their
// enclosing impl block, on the assumption that most users won't care about
// coverage for derived impls.
if let Some(impl_of) = tcx.impl_of_method(def_id.to_def_id())
&& tcx.is_automatically_derived(impl_of)
{
trace!("InstrumentCoverage skipped for {def_id:?} (automatically derived)");
return false;
}

if tcx.codegen_fn_attrs(def_id).flags.contains(CodegenFnAttrFlags::NO_COVERAGE) {
trace!("InstrumentCoverage skipped for {def_id:?} (`#[coverage(off)]`)");
return false;
}

Expand Down
90 changes: 27 additions & 63 deletions compiler/rustc_privacy/src/lib.rs
Original file line number Diff line number Diff line change
Expand Up @@ -24,13 +24,13 @@ use rustc_hir::def::{DefKind, Res};
use rustc_hir::def_id::{DefId, LocalDefId, LocalModDefId, CRATE_DEF_ID};
use rustc_hir::intravisit::{self, Visitor};
use rustc_hir::{AssocItemKind, ForeignItemKind, ItemId, PatKind};
use rustc_middle::bug;
use rustc_middle::hir::nested_filter;
use rustc_middle::middle::privacy::{EffectiveVisibilities, EffectiveVisibility, Level};
use rustc_middle::query::Providers;
use rustc_middle::ty::GenericArgs;
use rustc_middle::ty::{self, Const, GenericParamDefKind};
use rustc_middle::ty::{TraitRef, Ty, TyCtxt, TypeSuperVisitable, TypeVisitable, TypeVisitor};
use rustc_middle::{bug, span_bug};
use rustc_session::lint;
use rustc_span::hygiene::Transparency;
use rustc_span::symbol::{kw, sym, Ident};
Expand Down Expand Up @@ -1064,29 +1064,22 @@ impl<'tcx> Visitor<'tcx> for NamePrivacyVisitor<'tcx> {

struct TypePrivacyVisitor<'tcx> {
tcx: TyCtxt<'tcx>,
module_def_id: LocalModDefId,
maybe_typeck_results: Option<&'tcx ty::TypeckResults<'tcx>>,
current_item: LocalDefId,
span: Span,
}

impl<'tcx> TypePrivacyVisitor<'tcx> {
/// Gets the type-checking results for the current body.
/// As this will ICE if called outside bodies, only call when working with
/// `Expr` or `Pat` nodes (they are guaranteed to be found only in bodies).
#[track_caller]
fn typeck_results(&self) -> &'tcx ty::TypeckResults<'tcx> {
self.maybe_typeck_results
.expect("`TypePrivacyVisitor::typeck_results` called outside of body")
}

fn item_is_accessible(&self, did: DefId) -> bool {
self.tcx.visibility(did).is_accessible_from(self.current_item, self.tcx)
self.tcx.visibility(did).is_accessible_from(self.module_def_id, self.tcx)
}

// Take node-id of an expression or pattern and check its type for privacy.
fn check_expr_pat_type(&mut self, id: hir::HirId, span: Span) -> bool {
self.span = span;
let typeck_results = self.typeck_results();
let typeck_results = self
.maybe_typeck_results
.unwrap_or_else(|| span_bug!(span, "`hir::Expr` or `hir::Pat` outside of a body"));
let result: ControlFlow<()> = try {
self.visit(typeck_results.node_type(id))?;
self.visit(typeck_results.node_args(id))?;
Expand All @@ -1107,35 +1100,13 @@ impl<'tcx> TypePrivacyVisitor<'tcx> {
}

impl<'tcx> Visitor<'tcx> for TypePrivacyVisitor<'tcx> {
type NestedFilter = nested_filter::All;

/// We want to visit items in the context of their containing
/// module and so forth, so supply a crate for doing a deep walk.
fn nested_visit_map(&mut self) -> Self::Map {
self.tcx.hir()
}

fn visit_mod(&mut self, _m: &'tcx hir::Mod<'tcx>, _s: Span, _n: hir::HirId) {
// Don't visit nested modules, since we run a separate visitor walk
// for each module in `effective_visibilities`
}

fn visit_nested_body(&mut self, body: hir::BodyId) {
fn visit_nested_body(&mut self, body_id: hir::BodyId) {
let old_maybe_typeck_results =
self.maybe_typeck_results.replace(self.tcx.typeck_body(body));
let body = self.tcx.hir().body(body);
self.visit_body(body);
self.maybe_typeck_results.replace(self.tcx.typeck_body(body_id));
self.visit_body(self.tcx.hir().body(body_id));
self.maybe_typeck_results = old_maybe_typeck_results;
}

fn visit_generic_arg(&mut self, generic_arg: &'tcx hir::GenericArg<'tcx>) {
match generic_arg {
hir::GenericArg::Type(t) => self.visit_ty(t),
hir::GenericArg::Infer(inf) => self.visit_infer(inf),
hir::GenericArg::Lifetime(_) | hir::GenericArg::Const(_) => {}
}
}

fn visit_ty(&mut self, hir_ty: &'tcx hir::Ty<'tcx>) {
self.span = hir_ty.span;
if let Some(typeck_results) = self.maybe_typeck_results {
Expand Down Expand Up @@ -1163,19 +1134,19 @@ impl<'tcx> Visitor<'tcx> for TypePrivacyVisitor<'tcx> {
return;
}
} else {
// We don't do anything for const infers here.
// FIXME: check types of const infers here.
}
} else {
bug!("visit_infer without typeck_results");
span_bug!(self.span, "`hir::InferArg` outside of a body");
}
intravisit::walk_inf(self, inf);
}

fn visit_trait_ref(&mut self, trait_ref: &'tcx hir::TraitRef<'tcx>) {
self.span = trait_ref.path.span;
if self.maybe_typeck_results.is_none() {
// Avoid calling `hir_trait_to_predicates` in bodies, it will ICE.
// The traits' privacy in bodies is already checked as a part of trait object types.
if self.maybe_typeck_results.is_some() {
// Privacy of traits in bodies is checked as a part of trait object types.
} else {
let bounds = rustc_hir_analysis::hir_trait_to_predicates(
self.tcx,
trait_ref,
Expand Down Expand Up @@ -1223,7 +1194,10 @@ impl<'tcx> Visitor<'tcx> for TypePrivacyVisitor<'tcx> {
hir::ExprKind::MethodCall(segment, ..) => {
// Method calls have to be checked specially.
self.span = segment.ident.span;
if let Some(def_id) = self.typeck_results().type_dependent_def_id(expr.hir_id) {
let typeck_results = self
.maybe_typeck_results
.unwrap_or_else(|| span_bug!(self.span, "`hir::Expr` outside of a body"));
if let Some(def_id) = typeck_results.type_dependent_def_id(expr.hir_id) {
if self.visit(self.tcx.type_of(def_id).instantiate_identity()).is_break() {
return;
}
Expand Down Expand Up @@ -1251,9 +1225,13 @@ impl<'tcx> Visitor<'tcx> for TypePrivacyVisitor<'tcx> {
Res::Def(kind, def_id) => Some((kind, def_id)),
_ => None,
},
hir::QPath::TypeRelative(..) | hir::QPath::LangItem(..) => self
.maybe_typeck_results
.and_then(|typeck_results| typeck_results.type_dependent_def(id)),
hir::QPath::TypeRelative(..) | hir::QPath::LangItem(..) => {
match self.maybe_typeck_results {
Some(typeck_results) => typeck_results.type_dependent_def(id),
// FIXME: Check type-relative associated types in signatures.
None => None,
}
}
};
let def = def.filter(|(kind, _)| {
matches!(
Expand Down Expand Up @@ -1307,15 +1285,6 @@ impl<'tcx> Visitor<'tcx> for TypePrivacyVisitor<'tcx> {

intravisit::walk_local(self, local);
}

// Check types in item interfaces.
fn visit_item(&mut self, item: &'tcx hir::Item<'tcx>) {
let orig_current_item = mem::replace(&mut self.current_item, item.owner_id.def_id);
let old_maybe_typeck_results = self.maybe_typeck_results.take();
intravisit::walk_item(self, item);
self.maybe_typeck_results = old_maybe_typeck_results;
self.current_item = orig_current_item;
}
}

impl<'tcx> DefIdVisitor<'tcx> for TypePrivacyVisitor<'tcx> {
Expand Down Expand Up @@ -1785,13 +1754,8 @@ fn check_mod_privacy(tcx: TyCtxt<'_>, module_def_id: LocalModDefId) {

// Check privacy of explicitly written types and traits as well as
// inferred types of expressions and patterns.
let mut visitor = TypePrivacyVisitor {
tcx,
maybe_typeck_results: None,
current_item: module_def_id.to_local_def_id(),
span,
};
intravisit::walk_mod(&mut visitor, module, hir_id);
let mut visitor = TypePrivacyVisitor { tcx, module_def_id, maybe_typeck_results: None, span };
tcx.hir().visit_item_likes_in_module(module_def_id, &mut visitor);
}

fn effective_visibilities(tcx: TyCtxt<'_>, (): ()) -> &EffectiveVisibilities {
Expand Down
1 change: 1 addition & 0 deletions compiler/rustc_span/src/symbol.rs
Original file line number Diff line number Diff line change
Expand Up @@ -1793,6 +1793,7 @@ symbols! {
warn,
wasm_abi,
wasm_import_module,
wasm_preview2,
wasm_target_feature,
while_let,
windows,
Expand Down
1 change: 1 addition & 0 deletions compiler/rustc_target/src/spec/mod.rs
Original file line number Diff line number Diff line change
Expand Up @@ -1574,6 +1574,7 @@ supported_targets! {
("wasm32-unknown-emscripten", wasm32_unknown_emscripten),
("wasm32-unknown-unknown", wasm32_unknown_unknown),
("wasm32-wasi", wasm32_wasi),
("wasm32-wasi-preview2", wasm32_wasi_preview2),
("wasm32-wasi-preview1-threads", wasm32_wasi_preview1_threads),
("wasm64-unknown-unknown", wasm64_unknown_unknown),

Expand Down
Original file line number Diff line number Diff line change
Expand Up @@ -72,11 +72,12 @@
//! best we can with this target. Don't start relying on too much here unless
//! you know what you're getting in to!

use crate::spec::{base, crt_objects, Cc, LinkSelfContainedDefault, LinkerFlavor, Target};
use crate::spec::{base, crt_objects, cvs, Cc, LinkSelfContainedDefault, LinkerFlavor, Target};

pub fn target() -> Target {
let mut options = base::wasm::options();

options.families = cvs!["wasm", "wasi"];
options.os = "wasi".into();

options.add_pre_link_args(
Expand Down
64 changes: 64 additions & 0 deletions compiler/rustc_target/src/spec/targets/wasm32_wasi_preview2.rs
Original file line number Diff line number Diff line change
@@ -0,0 +1,64 @@
//! The `wasm32-wasi-preview2` target is the next evolution of the
//! wasm32-wasi target. While the wasi specification is still under
//! active development, the {review 2 iteration is considered an "island
//! of stability" that should allow users to rely on it indefinitely.
//!
//! The `wasi` target is a proposal to define a standardized set of WebAssembly
//! component imports that allow it to interoperate with the host system in a
//! standardized way. This set of imports is intended to empower WebAssembly
//! binaries with host capabilities such as filesystem access, network access, etc.
//!
//! Wasi Preview 2 relies on the WebAssembly component model which is an extension of
//! the core WebAssembly specification which allows interoperability between WebAssembly
//! modules (known as "components") through high-level, shared-nothing APIs instead of the
//! low-level, shared-everything linear memory model of the core WebAssembly specification.
//!
//! You can see more about wasi at <https://wasi.dev> and the component model at
//! <https://github.com/WebAssembly/component-model>.

use crate::spec::crt_objects;
use crate::spec::LinkSelfContainedDefault;
use crate::spec::{base, Target};

pub fn target() -> Target {
let mut options = base::wasm::options();

options.os = "wasi".into();
options.env = "preview2".into();
options.linker = Some("wasm-component-ld".into());

options.pre_link_objects_self_contained = crt_objects::pre_wasi_self_contained();
options.post_link_objects_self_contained = crt_objects::post_wasi_self_contained();

// FIXME: Figure out cases in which WASM needs to link with a native toolchain.
options.link_self_contained = LinkSelfContainedDefault::True;

// Right now this is a bit of a workaround but we're currently saying that
// the target by default has a static crt which we're taking as a signal
// for "use the bundled crt". If that's turned off then the system's crt
// will be used, but this means that default usage of this target doesn't
// need an external compiler but it's still interoperable with an external
// compiler if configured correctly.
options.crt_static_default = true;
options.crt_static_respected = true;

// Allow `+crt-static` to create a "cdylib" output which is just a wasm file
// without a main function.
options.crt_static_allows_dylibs = true;

// WASI's `sys::args::init` function ignores its arguments; instead,
// `args::args()` makes the WASI API calls itself.
options.main_needs_argc_argv = false;

// And, WASI mangles the name of "main" to distinguish between different
// signatures.
options.entry_name = "__main_void".into();

Target {
llvm_target: "wasm32-unknown-unknown".into(),
pointer_width: 32,
data_layout: "e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-n32:64-S128-ni:1:10:20".into(),
arch: "wasm32".into(),
options,
}
}
Original file line number Diff line number Diff line change
Expand Up @@ -3155,7 +3155,7 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
} else {
// FIXME: we may suggest array::repeat instead
err.help("consider using `core::array::from_fn` to initialize the array");
err.help("see https://doc.rust-lang.org/stable/std/array/fn.from_fn.html# for more information");
err.help("see https://doc.rust-lang.org/stable/std/array/fn.from_fn.html for more information");
}

if self.tcx.sess.is_nightly_build()
Expand Down
37 changes: 37 additions & 0 deletions library/core/src/num/nonzero.rs
Original file line number Diff line number Diff line change
Expand Up @@ -288,6 +288,43 @@ macro_rules! nonzero_integer {
unsafe { intrinsics::cttz_nonzero(self.get() as $UnsignedPrimitive) as u32 }
}

/// Returns the number of ones in the binary representation of `self`.
///
/// # Examples
///
/// Basic usage:
///
/// ```
/// #![feature(non_zero_count_ones)]
/// # fn main() { test().unwrap(); }
/// # fn test() -> Option<()> {
#[doc = concat!("# use std::num::{self, ", stringify!($Ty), "};")]
///
/// let one = num::NonZeroU32::new(1)?;
/// let three = num::NonZeroU32::new(3)?;
#[doc = concat!("let a = ", stringify!($Ty), "::new(0b100_0000)?;")]
#[doc = concat!("let b = ", stringify!($Ty), "::new(0b100_0011)?;")]
///
/// assert_eq!(a.count_ones(), one);
/// assert_eq!(b.count_ones(), three);
/// # Some(())
/// # }
/// ```
///
#[unstable(feature = "non_zero_count_ones", issue = "120287")]
#[rustc_const_unstable(feature = "non_zero_count_ones", issue = "120287")]
#[doc(alias = "popcount")]
#[doc(alias = "popcnt")]
#[must_use = "this returns the result of the operation, \
without modifying the original"]
#[inline(always)]
pub const fn count_ones(self) -> NonZeroU32 {
// SAFETY:
// `self` is non-zero, which means it has at least one bit set, which means
// that the result of `count_ones` is non-zero.
unsafe { NonZeroU32::new_unchecked(self.get().count_ones()) }
}

nonzero_integer_signedness_dependent_methods! {
Self = $Ty,
Primitive = $signedness $Int,
Expand Down
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