Auto merge of rust-lang#99024 - matthiaskrgr:rollup-8ygpcpg, r=matthi…

…askrgr

Rollup of 9 pull requests

Successful merges:

 - rust-lang#97917 (Implement ExitCodeExt for Windows)
 - rust-lang#98844 (Reword comments and rename HIR visiting methods.)
 - rust-lang#98979 (interpret: use AllocRange in UninitByteAccess)
 - rust-lang#98986 (Fix missing word in comment)
 - rust-lang#98994 (replace process exit with more detailed exit in src/bootstrap/*.rs)
 - rust-lang#98995 (Add a test for rust-lang#80471)
 - rust-lang#99002 (suggest adding a derive for #[default] applied to variants)
 - rust-lang#99004 (Add a test for rust-lang#70408)
 - rust-lang#99017 (Replace boolean argument for print_where_clause with an enum to make code more clear)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

compiler/rustc_const_eval/src/interpret/validity.rs

@@ -427,7 +427,7 @@ impl<'rt, 'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> ValidityVisitor<'rt, 'mir, '
             err_ub!(DanglingIntPointer(0, _)) =>
                 { "a null {kind}" },
             err_ub!(DanglingIntPointer(i, _)) =>
-                { "a dangling {kind} (address 0x{i:x} is unallocated)" },
+                { "a dangling {kind} (address {i:#x} is unallocated)" },
             err_ub!(PointerOutOfBounds { .. }) =>
                 { "a dangling {kind} (going beyond the bounds of its allocation)" },
             // This cannot happen during const-eval (because interning already detects
@@ -941,7 +941,7 @@ impl<'rt, 'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> ValueVisitor<'mir, 'tcx, M>
                                 // element that byte belongs to so we can
                                 // provide an index.
                                 let i = usize::try_from(
-                                    access.uninit_offset.bytes() / layout.size.bytes(),
+                                    access.uninit.start.bytes() / layout.size.bytes(),
                                 )
                                 .unwrap();
                                 self.path.push(PathElem::ArrayElem(i));

compiler/rustc_hir/src/intravisit.rs

@@ -19,7 +19,7 @@
 //!    - Example: Examine each expression to look for its type and do some check or other.
 //!    - How: Implement `intravisit::Visitor` and override the `NestedFilter` type to
 //!      `nested_filter::OnlyBodies` (and implement `nested_visit_map`), and use
-//!      `tcx.hir().deep_visit_all_item_likes(&mut visitor)`. Within your
+//!      `tcx.hir().visit_all_item_likes_in_crate(&mut visitor)`. Within your
 //!      `intravisit::Visitor` impl, implement methods like `visit_expr()` (don't forget to invoke
 //!      `intravisit::walk_expr()` to keep walking the subparts).
 //!    - Pro: Visitor methods for any kind of HIR node, not just item-like things.
@@ -190,7 +190,7 @@ use nested_filter::NestedFilter;
 /// (this is why the module is called `intravisit`, to distinguish it
 /// from the AST's `visit` module, which acts differently). If you
 /// simply want to visit all items in the crate in some order, you
-/// should call `Crate::visit_all_items`. Otherwise, see the comment
+/// should call `tcx.hir().visit_all_item_likes_in_crate`. Otherwise, see the comment
 /// on `visit_nested_item` for details on how to visit nested items.
 ///
 /// If you want to ensure that your code handles every variant

compiler/rustc_incremental/src/assert_dep_graph.rs

@@ -75,7 +75,7 @@ pub fn assert_dep_graph(tcx: TyCtxt<'_>) {
             let mut visitor =
                 IfThisChanged { tcx, if_this_changed: vec![], then_this_would_need: vec![] };
             visitor.process_attrs(hir::CRATE_HIR_ID);
-            tcx.hir().deep_visit_all_item_likes(&mut visitor);
+            tcx.hir().visit_all_item_likes_in_crate(&mut visitor);
             (visitor.if_this_changed, visitor.then_this_would_need)
         };
 

compiler/rustc_metadata/src/rmeta/encoder.rs

@@ -419,7 +419,7 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
             return;
         }
 
-        self.tcx.hir().deep_visit_all_item_likes(self);
+        self.tcx.hir().visit_all_item_likes_in_crate(self);
     }
 
     fn encode_def_path_table(&mut self) {

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

@@ -561,7 +561,7 @@ impl<'hir> Map<'hir> {
         }
     }
 
-    /// Walks the contents of a crate. See also `Crate::visit_all_items`.
+    /// Walks the contents of the local crate. See also `visit_all_item_likes_in_crate`.
     pub fn walk_toplevel_module(self, visitor: &mut impl Visitor<'hir>) {
         let (top_mod, span, hir_id) = self.get_module(CRATE_DEF_ID);
         visitor.visit_mod(top_mod, span, hir_id);
@@ -581,53 +581,61 @@ impl<'hir> Map<'hir> {
         }
     }
 
-    /// Visits all items in the crate in some deterministic (but
-    /// unspecified) order. If you need to process every item,
-    /// and care about nesting -- usually because your algorithm
-    /// follows lexical scoping rules -- then this method is the best choice.
-    /// If you don't care about nesting, you should use the `tcx.hir_crate_items()` query
-    /// or `items()` instead.
+    /// Visits all item-likes in the crate in some deterministic (but unspecified) order. If you
+    /// need to process every item-like, and don't care about visiting nested items in a particular
+    /// order then this method is the best choice.  If you do care about this nesting, you should
+    /// use the `tcx.hir().walk_toplevel_module`.
+    ///
+    /// Note that this function will access HIR for all the item-likes in the crate.  If you only
+    /// need to access some of them, it is usually better to manually loop on the iterators
+    /// provided by `tcx.hir_crate_items(())`.
     ///
     /// Please see the notes in `intravisit.rs` for more information.
-    pub fn deep_visit_all_item_likes<V>(self, visitor: &mut V)
+    pub fn visit_all_item_likes_in_crate<V>(self, visitor: &mut V)
     where
         V: Visitor<'hir>,
     {
-        let krate = self.krate();
-        for owner in krate.owners.iter().filter_map(|i| i.as_owner()) {
-            match owner.node() {
-                OwnerNode::Item(item) => visitor.visit_item(item),
-                OwnerNode::ForeignItem(item) => visitor.visit_foreign_item(item),
-                OwnerNode::ImplItem(item) => visitor.visit_impl_item(item),
-                OwnerNode::TraitItem(item) => visitor.visit_trait_item(item),
-                OwnerNode::Crate(_) => {}
-            }
+        let krate = self.tcx.hir_crate_items(());
+
+        for id in krate.items() {
+            visitor.visit_item(self.item(id));
+        }
+
+        for id in krate.trait_items() {
+            visitor.visit_trait_item(self.trait_item(id));
+        }
+
+        for id in krate.impl_items() {
+            visitor.visit_impl_item(self.impl_item(id));
+        }
+
+        for id in krate.foreign_items() {
+            visitor.visit_foreign_item(self.foreign_item(id));
         }
     }
 
-    /// If you don't care about nesting, you should use the
-    /// `tcx.hir_module_items()` query or `module_items()` instead.
-    /// Please see notes in `deep_visit_all_item_likes`.
-    pub fn deep_visit_item_likes_in_module<V>(self, module: LocalDefId, visitor: &mut V)
+    /// This method is the equivalent of `visit_all_item_likes_in_crate` but restricted to
+    /// item-likes in a single module.
+    pub fn visit_item_likes_in_module<V>(self, module: LocalDefId, visitor: &mut V)
     where
         V: Visitor<'hir>,
     {
         let module = self.tcx.hir_module_items(module);
 
-        for id in module.items.iter() {
-            visitor.visit_item(self.item(*id));
+        for id in module.items() {
+            visitor.visit_item(self.item(id));
         }
 
-        for id in module.trait_items.iter() {
-            visitor.visit_trait_item(self.trait_item(*id));
+        for id in module.trait_items() {
+            visitor.visit_trait_item(self.trait_item(id));
         }
 
-        for id in module.impl_items.iter() {
-            visitor.visit_impl_item(self.impl_item(*id));
+        for id in module.impl_items() {
+            visitor.visit_impl_item(self.impl_item(id));
         }
 
-        for id in module.foreign_items.iter() {
-            visitor.visit_foreign_item(self.foreign_item(*id));
+        for id in module.foreign_items() {
+            visitor.visit_foreign_item(self.foreign_item(id));
         }
     }
 

compiler/rustc_middle/src/hir/nested_filter.rs

@@ -8,7 +8,7 @@ use rustc_hir::intravisit::nested_filter::NestedFilter;
 /// constant arguments of types, e.g. in `let _: [(); /* HERE */];`.
 ///
 /// **This is the most common choice.** A very common pattern is
-/// to use `deep_visit_all_item_likes()` as an outer loop,
+/// to use `visit_all_item_likes_in_crate()` as an outer loop,
 /// and to have the visitor that visits the contents of each item
 /// using this setting.
 pub struct OnlyBodies(());

compiler/rustc_middle/src/mir/interpret/allocation.rs

@@ -179,6 +179,11 @@ pub fn alloc_range(start: Size, size: Size) -> AllocRange {
 }
 
 impl AllocRange {
+    #[inline]
+    pub fn from(r: Range<Size>) -> Self {
+        alloc_range(r.start, r.end - r.start) // `Size` subtraction (overflow-checked)
+    }
+
     #[inline(always)]
     pub fn end(self) -> Size {
         self.start + self.size // This does overflow checking.
@@ -1095,17 +1100,17 @@ impl InitMask {
     /// Returns `Ok(())` if it's initialized. Otherwise returns a range of byte
     /// indexes for the first contiguous span of the uninitialized access.
     #[inline]
-    pub fn is_range_initialized(&self, start: Size, end: Size) -> Result<(), Range<Size>> {
+    pub fn is_range_initialized(&self, start: Size, end: Size) -> Result<(), AllocRange> {
         if end > self.len {
-            return Err(self.len..end);
+            return Err(AllocRange::from(self.len..end));
         }
 
         let uninit_start = self.find_bit(start, end, false);
 
         match uninit_start {
             Some(uninit_start) => {
                 let uninit_end = self.find_bit(uninit_start, end, true).unwrap_or(end);
-                Err(uninit_start..uninit_end)
+                Err(AllocRange::from(uninit_start..uninit_end))
             }
             None => Ok(()),
         }
@@ -1176,19 +1181,17 @@ impl<Tag: Copy, Extra> Allocation<Tag, Extra> {
     ///
     /// Returns `Ok(())` if it's initialized. Otherwise returns the range of byte
     /// indexes of the first contiguous uninitialized access.
-    fn is_init(&self, range: AllocRange) -> Result<(), Range<Size>> {
+    fn is_init(&self, range: AllocRange) -> Result<(), AllocRange> {
         self.init_mask.is_range_initialized(range.start, range.end()) // `Size` addition
     }
 
     /// Checks that a range of bytes is initialized. If not, returns the `InvalidUninitBytes`
     /// error which will report the first range of bytes which is uninitialized.
     fn check_init(&self, range: AllocRange) -> AllocResult {
-        self.is_init(range).map_err(|idx_range| {
+        self.is_init(range).map_err(|uninit_range| {
             AllocError::InvalidUninitBytes(Some(UninitBytesAccess {
-                access_offset: range.start,
-                access_size: range.size,
-                uninit_offset: idx_range.start,
-                uninit_size: idx_range.end - idx_range.start, // `Size` subtraction
+                access: range,
+                uninit: uninit_range,
             }))
         })
     }

compiler/rustc_middle/src/mir/interpret/error.rs

@@ -1,4 +1,4 @@
-use super::{AllocId, ConstAlloc, Pointer, Scalar};
+use super::{AllocId, AllocRange, ConstAlloc, Pointer, Scalar};
 
 use crate::mir::interpret::ConstValue;
 use crate::ty::{layout, query::TyCtxtAt, tls, FnSig, Ty, ValTree};
@@ -162,9 +162,9 @@ impl fmt::Display for InvalidProgramInfo<'_> {
             AlreadyReported(ErrorGuaranteed { .. }) => {
                 write!(f, "encountered constants with type errors, stopping evaluation")
             }
-            Layout(ref err) => write!(f, "{}", err),
-            FnAbiAdjustForForeignAbi(ref err) => write!(f, "{}", err),
-            SizeOfUnsizedType(ty) => write!(f, "size_of called on unsized type `{}`", ty),
+            Layout(ref err) => write!(f, "{err}"),
+            FnAbiAdjustForForeignAbi(ref err) => write!(f, "{err}"),
+            SizeOfUnsizedType(ty) => write!(f, "size_of called on unsized type `{ty}`"),
         }
     }
 }
@@ -205,14 +205,10 @@ impl fmt::Display for CheckInAllocMsg {
 /// Details of an access to uninitialized bytes where it is not allowed.
 #[derive(Debug)]
 pub struct UninitBytesAccess {
-    /// Location of the original memory access.
-    pub access_offset: Size,
-    /// Size of the original memory access.
-    pub access_size: Size,
-    /// Location of the first uninitialized byte that was accessed.
-    pub uninit_offset: Size,
-    /// Number of consecutive uninitialized bytes that were accessed.
-    pub uninit_size: Size,
+    /// Range of the original memory access.
+    pub access: AllocRange,
+    /// Range of the uninit memory that was encountered. (Might not be maximal.)
+    pub uninit: AllocRange,
 }
 
 /// Information about a size mismatch.
@@ -308,30 +304,28 @@ impl fmt::Display for UndefinedBehaviorInfo<'_> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         use UndefinedBehaviorInfo::*;
         match self {
-            Ub(msg) => write!(f, "{}", msg),
+            Ub(msg) => write!(f, "{msg}"),
             Unreachable => write!(f, "entering unreachable code"),
             BoundsCheckFailed { ref len, ref index } => {
-                write!(f, "indexing out of bounds: the len is {} but the index is {}", len, index)
+                write!(f, "indexing out of bounds: the len is {len} but the index is {index}")
             }
             DivisionByZero => write!(f, "dividing by zero"),
             RemainderByZero => write!(f, "calculating the remainder with a divisor of zero"),
             DivisionOverflow => write!(f, "overflow in signed division (dividing MIN by -1)"),
             RemainderOverflow => write!(f, "overflow in signed remainder (dividing MIN by -1)"),
             PointerArithOverflow => write!(f, "overflowing in-bounds pointer arithmetic"),
-            InvalidMeta(msg) => write!(f, "invalid metadata in wide pointer: {}", msg),
+            InvalidMeta(msg) => write!(f, "invalid metadata in wide pointer: {msg}"),
             InvalidVtableDropFn(sig) => write!(
                 f,
-                "invalid drop function signature: got {}, expected exactly one argument which must be a pointer type",
-                sig
+                "invalid drop function signature: got {sig}, expected exactly one argument which must be a pointer type",
             ),
             InvalidVtableSize => {
                 write!(f, "invalid vtable: size is bigger than largest supported object")
             }
-            InvalidVtableAlignment(msg) => write!(f, "invalid vtable: alignment {}", msg),
+            InvalidVtableAlignment(msg) => write!(f, "invalid vtable: alignment {msg}"),
             UnterminatedCString(p) => write!(
                 f,
-                "reading a null-terminated string starting at {:?} with no null found before end of allocation",
-                p,
+                "reading a null-terminated string starting at {p:?} with no null found before end of allocation",
             ),
             PointerUseAfterFree(a) => {
                 write!(f, "pointer to {a:?} was dereferenced after this allocation got freed")
@@ -359,41 +353,36 @@ impl fmt::Display for UndefinedBehaviorInfo<'_> {
             }
             AlignmentCheckFailed { required, has } => write!(
                 f,
-                "accessing memory with alignment {}, but alignment {} is required",
-                has.bytes(),
-                required.bytes()
+                "accessing memory with alignment {has}, but alignment {required} is required",
+                has = has.bytes(),
+                required = required.bytes()
             ),
             WriteToReadOnly(a) => write!(f, "writing to {a:?} which is read-only"),
             DerefFunctionPointer(a) => write!(f, "accessing {a:?} which contains a function"),
             ValidationFailure { path: None, msg } => {
-                write!(f, "constructing invalid value: {}", msg)
+                write!(f, "constructing invalid value: {msg}")
             }
             ValidationFailure { path: Some(path), msg } => {
-                write!(f, "constructing invalid value at {}: {}", path, msg)
+                write!(f, "constructing invalid value at {path}: {msg}")
             }
             InvalidBool(b) => {
-                write!(f, "interpreting an invalid 8-bit value as a bool: 0x{:02x}", b)
+                write!(f, "interpreting an invalid 8-bit value as a bool: 0x{b:02x}")
             }
             InvalidChar(c) => {
-                write!(f, "interpreting an invalid 32-bit value as a char: 0x{:08x}", c)
+                write!(f, "interpreting an invalid 32-bit value as a char: 0x{c:08x}")
             }
-            InvalidTag(val) => write!(f, "enum value has invalid tag: {:x}", val),
+            InvalidTag(val) => write!(f, "enum value has invalid tag: {val:x}"),
             InvalidFunctionPointer(p) => {
-                write!(f, "using {:?} as function pointer but it does not point to a function", p)
+                write!(f, "using {p:?} as function pointer but it does not point to a function")
             }
-            InvalidStr(err) => write!(f, "this string is not valid UTF-8: {}", err),
-            InvalidUninitBytes(Some((alloc, access))) => write!(
+            InvalidStr(err) => write!(f, "this string is not valid UTF-8: {err}"),
+            InvalidUninitBytes(Some((alloc, info))) => write!(
                 f,
-                "reading {} byte{} of memory starting at {:?}, \
-                 but {} byte{} {} uninitialized starting at {:?}, \
+                "reading memory at {alloc:?}{access:?}, \
+                 but memory is uninitialized at {uninit:?}, \
                  and this operation requires initialized memory",
-                access.access_size.bytes(),
-                pluralize!(access.access_size.bytes()),
-                Pointer::new(*alloc, access.access_offset),
-                access.uninit_size.bytes(),
-                pluralize!(access.uninit_size.bytes()),
-                pluralize!("is", access.uninit_size.bytes()),
-                Pointer::new(*alloc, access.uninit_offset),
+                access = info.access,
+                uninit = info.uninit,
             ),
             InvalidUninitBytes(None) => write!(
                 f,
@@ -402,8 +391,7 @@ impl fmt::Display for UndefinedBehaviorInfo<'_> {
             DeadLocal => write!(f, "accessing a dead local variable"),
             ScalarSizeMismatch(self::ScalarSizeMismatch { target_size, data_size }) => write!(
                 f,
-                "scalar size mismatch: expected {} bytes but got {} bytes instead",
-                target_size, data_size
+                "scalar size mismatch: expected {target_size} bytes but got {data_size} bytes instead",
             ),
             UninhabitedEnumVariantWritten => {
                 write!(f, "writing discriminant of an uninhabited enum")
@@ -437,13 +425,13 @@ impl fmt::Display for UnsupportedOpInfo {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         use UnsupportedOpInfo::*;
         match self {
-            Unsupported(ref msg) => write!(f, "{}", msg),
+            Unsupported(ref msg) => write!(f, "{msg}"),
             ReadPointerAsBytes => write!(f, "unable to turn pointer into raw bytes"),
             PartialPointerOverwrite(ptr) => {
-                write!(f, "unable to overwrite parts of a pointer in memory at {:?}", ptr)
+                write!(f, "unable to overwrite parts of a pointer in memory at {ptr:?}")
             }
-            ThreadLocalStatic(did) => write!(f, "cannot access thread local static ({:?})", did),
-            ReadExternStatic(did) => write!(f, "cannot read from extern static ({:?})", did),
+            ThreadLocalStatic(did) => write!(f, "cannot access thread local static ({did:?})"),
+            ReadExternStatic(did) => write!(f, "cannot read from extern static ({did:?})"),
         }
     }
 }
@@ -526,11 +514,11 @@ impl fmt::Display for InterpError<'_> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         use InterpError::*;
         match *self {
-            Unsupported(ref msg) => write!(f, "{}", msg),
-            InvalidProgram(ref msg) => write!(f, "{}", msg),
-            UndefinedBehavior(ref msg) => write!(f, "{}", msg),
-            ResourceExhaustion(ref msg) => write!(f, "{}", msg),
-            MachineStop(ref msg) => write!(f, "{}", msg),
+            Unsupported(ref msg) => write!(f, "{msg}"),
+            InvalidProgram(ref msg) => write!(f, "{msg}"),
+            UndefinedBehavior(ref msg) => write!(f, "{msg}"),
+            ResourceExhaustion(ref msg) => write!(f, "{msg}"),
+            MachineStop(ref msg) => write!(f, "{msg}"),
         }
     }
 }