Auto merge of rust-lang#95711 - Dylan-DPC:rollup-ujss3oi, r=Dylan-DPC

Rollup of 4 pull requests

Successful merges:

 - rust-lang#95659 (Rely on #[link] attribute for unwind on Fuchsia.)
 - rust-lang#95684 (rustdoc: Fix item info display overflow)
 - rust-lang#95693 (interp: pass TyCtxt to Machine methods that do not take InterpCx)
 - rust-lang#95699 (fix: Vec leak when capacity is 0)

Failed merges:

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

compiler/rustc_const_eval/src/const_eval/machine.rs

@@ -1,6 +1,6 @@
 use rustc_hir::def::DefKind;
 use rustc_middle::mir;
-use rustc_middle::ty::{self, Ty};
+use rustc_middle::ty::{self, Ty, TyCtxt};
 use std::borrow::Borrow;
 use std::collections::hash_map::Entry;
 use std::hash::Hash;
@@ -471,6 +471,7 @@ impl<'mir, 'tcx> interpret::Machine<'mir, 'tcx> for CompileTimeInterpreter<'mir,
     }
 
     fn before_access_global(
+        _tcx: TyCtxt<'tcx>,
         machine: &Self,
         alloc_id: AllocId,
         alloc: ConstAllocation<'tcx>,

compiler/rustc_const_eval/src/interpret/machine.rs

@@ -7,7 +7,7 @@ use std::fmt::Debug;
 use std::hash::Hash;
 
 use rustc_middle::mir;
-use rustc_middle::ty::{self, Ty};
+use rustc_middle::ty::{self, Ty, TyCtxt};
 use rustc_span::def_id::DefId;
 use rustc_target::abi::Size;
 use rustc_target::spec::abi::Abi;
@@ -246,6 +246,7 @@ pub trait Machine<'mir, 'tcx>: Sized {
     /// `def_id` is `Some` if this is the "lazy" allocation of a static.
     #[inline]
     fn before_access_global(
+        _tcx: TyCtxt<'tcx>,
         _machine: &Self,
         _alloc_id: AllocId,
         _allocation: ConstAllocation<'tcx>,
@@ -317,6 +318,7 @@ pub trait Machine<'mir, 'tcx>: Sized {
     /// need to mutate.
     #[inline(always)]
     fn memory_read(
+        _tcx: TyCtxt<'tcx>,
         _machine: &Self,
         _alloc_extra: &Self::AllocExtra,
         _tag: Self::PointerTag,
@@ -328,6 +330,7 @@ pub trait Machine<'mir, 'tcx>: Sized {
     /// Hook for performing extra checks on a memory write access.
     #[inline(always)]
     fn memory_written(
+        _tcx: TyCtxt<'tcx>,
         _machine: &mut Self,
         _alloc_extra: &mut Self::AllocExtra,
         _tag: Self::PointerTag,
@@ -339,6 +342,7 @@ pub trait Machine<'mir, 'tcx>: Sized {
     /// Hook for performing extra operations on a memory deallocation.
     #[inline(always)]
     fn memory_deallocated(
+        _tcx: TyCtxt<'tcx>,
         _machine: &mut Self,
         _alloc_extra: &mut Self::AllocExtra,
         _tag: Self::PointerTag,

compiler/rustc_const_eval/src/interpret/memory.rs

@@ -327,6 +327,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
         // Let the machine take some extra action
         let size = alloc.size();
         M::memory_deallocated(
+            *self.tcx,
             &mut self.machine,
             &mut alloc.extra,
             ptr.provenance,
@@ -509,7 +510,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                 (self.tcx.eval_static_initializer(def_id)?, Some(def_id))
             }
         };
-        M::before_access_global(&self.machine, id, alloc, def_id, is_write)?;
+        M::before_access_global(*self.tcx, &self.machine, id, alloc, def_id, is_write)?;
         // We got tcx memory. Let the machine initialize its "extra" stuff.
         let alloc = M::init_allocation_extra(
             self,
@@ -575,7 +576,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
         )?;
         if let Some((alloc_id, offset, ptr, alloc)) = ptr_and_alloc {
             let range = alloc_range(offset, size);
-            M::memory_read(&self.machine, &alloc.extra, ptr.provenance, range)?;
+            M::memory_read(*self.tcx, &self.machine, &alloc.extra, ptr.provenance, range)?;
             Ok(Some(AllocRef { alloc, range, tcx: *self.tcx, alloc_id }))
         } else {
             // Even in this branch we have to be sure that we actually access the allocation, in
@@ -636,7 +637,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
             // We cannot call `get_raw_mut` inside `check_and_deref_ptr` as that would duplicate `&mut self`.
             let (alloc, machine) = self.get_alloc_raw_mut(alloc_id)?;
             let range = alloc_range(offset, size);
-            M::memory_written(machine, &mut alloc.extra, ptr.provenance, range)?;
+            M::memory_written(tcx, machine, &mut alloc.extra, ptr.provenance, range)?;
             Ok(Some(AllocRefMut { alloc, range, tcx, alloc_id }))
         } else {
             Ok(None)
@@ -1009,7 +1010,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
         };
         let src_alloc = self.get_alloc_raw(src_alloc_id)?;
         let src_range = alloc_range(src_offset, size);
-        M::memory_read(&self.machine, &src_alloc.extra, src.provenance, src_range)?;
+        M::memory_read(*tcx, &self.machine, &src_alloc.extra, src.provenance, src_range)?;
         // We need the `dest` ptr for the next operation, so we get it now.
         // We already did the source checks and called the hooks so we are good to return early.
         let Some((dest_alloc_id, dest_offset, dest)) = dest_parts else {
@@ -1034,7 +1035,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
         // Destination alloc preparations and access hooks.
         let (dest_alloc, extra) = self.get_alloc_raw_mut(dest_alloc_id)?;
         let dest_range = alloc_range(dest_offset, size * num_copies);
-        M::memory_written(extra, &mut dest_alloc.extra, dest.provenance, dest_range)?;
+        M::memory_written(*tcx, extra, &mut dest_alloc.extra, dest.provenance, dest_range)?;
         let dest_bytes = dest_alloc
             .get_bytes_mut_ptr(&tcx, dest_range)
             .map_err(|e| e.to_interp_error(dest_alloc_id))?

compiler/rustc_mir_transform/src/const_prop.rs

@@ -265,6 +265,7 @@ impl<'mir, 'tcx> interpret::Machine<'mir, 'tcx> for ConstPropMachine<'mir, 'tcx>
     }
 
     fn before_access_global(
+        _tcx: TyCtxt<'tcx>,
         _machine: &Self,
         _alloc_id: AllocId,
         alloc: ConstAllocation<'tcx, Self::PointerTag, Self::AllocExtra>,

compiler/rustc_mir_transform/src/const_prop_lint.rs

@@ -261,6 +261,7 @@ impl<'mir, 'tcx> interpret::Machine<'mir, 'tcx> for ConstPropMachine<'mir, 'tcx>
     }
 
     fn before_access_global(
+        _tcx: TyCtxt<'tcx>,
         _machine: &Self,
         _alloc_id: AllocId,
         alloc: ConstAllocation<'tcx, Self::PointerTag, Self::AllocExtra>,

library/alloc/src/raw_vec.rs

@@ -168,7 +168,8 @@ impl<T, A: Allocator> RawVec<T, A> {
 
     #[cfg(not(no_global_oom_handling))]
     fn allocate_in(capacity: usize, init: AllocInit, alloc: A) -> Self {
-        if mem::size_of::<T>() == 0 {
+        // Don't allocate here because `Drop` will not deallocate when `capacity` is 0.
+        if mem::size_of::<T>() == 0 || capacity == 0 {
             Self::new_in(alloc)
         } else {
             // We avoid `unwrap_or_else` here because it bloats the amount of

library/unwind/build.rs

@@ -40,8 +40,6 @@ fn main() {
         // This is handled in the target spec with late_link_args_[static|dynamic]
     } else if target.contains("uwp-windows-gnu") {
         println!("cargo:rustc-link-lib=unwind");
-    } else if target.contains("fuchsia") {
-        println!("cargo:rustc-link-lib=unwind");
     } else if target.contains("haiku") {
         println!("cargo:rustc-link-lib=gcc_s");
     } else if target.contains("redox") {

src/ci/docker/host-x86_64/x86_64-gnu-tools/browser-ui-test.version

@@ -1 +1 @@
-0.8.4
+0.8.5

src/librustdoc/html/render/mod.rs

@@ -1772,7 +1772,7 @@ pub(crate) fn render_impl_summary(
     let is_trait = i.inner_impl().trait_.is_some();
     if is_trait {
         if let Some(portability) = portability(&i.impl_item, Some(parent)) {
-            write!(w, "<span class=\"item-info\">{}</span>", portability);
+            write!(w, "<div class=\"item-info\">{}</div>", portability);
         }
     }
 

src/test/rustdoc-gui/item-info-overflow.goml

@@ -0,0 +1,28 @@
+// This test ensures that the "item-info" elements don't overflow.
+goto: file://|DOC_PATH|/lib2/struct.LongItemInfo.html
+// We set a fixed size so there is no chance of "random" resize.
+size: (1200, 870)
+// Logically, the "item-decl" and the "item-info" should have the same scroll width.
+compare-elements-property: (".docblock.item-decl", ".item-info", ["scrollWidth"])
+assert-property: (".item-info", {"scrollWidth": "890"})
+// Just to be sure we're comparing the correct "item-info":
+assert-text: (
+    ".item-info",
+    "This is supported on Android or Linux or Emscripten or DragonFly BSD",
+    STARTS_WITH,
+)
+
+// Checking the "item-info" on an impl block as well:
+goto: file://|DOC_PATH|/lib2/struct.LongItemInfo2.html
+compare-elements-property: (
+    "#impl-SimpleTrait .item-info",
+    "#impl-SimpleTrait + .docblock",
+    ["scrollWidth"],
+)
+assert-property: ("#impl-SimpleTrait .item-info", {"scrollWidth": "866"})
+// Just to be sure we're comparing the correct "item-info":
+assert-text: (
+    "#impl-SimpleTrait .item-info",
+    "This is supported on Android or Linux or Emscripten or DragonFly BSD",
+    STARTS_WITH,
+)

src/test/rustdoc-gui/src/lib2/lib.rs

@@ -120,3 +120,13 @@ pub struct HasALongTraitWithParams {}
 pub trait LongTraitWithParamsBananaBananaBanana<T> {}
 
 impl LongTraitWithParamsBananaBananaBanana<usize> for HasALongTraitWithParams {}
+
+#[doc(cfg(any(target_os = "android", target_os = "linux", target_os = "emscripten", target_os = "dragonfly", target_os = "freebsd", target_os = "netbsd", target_os = "openbsd")))]
+pub struct LongItemInfo;
+
+pub trait SimpleTrait {}
+pub struct LongItemInfo2;
+
+/// Some docs.
+#[doc(cfg(any(target_os = "android", target_os = "linux", target_os = "emscripten", target_os = "dragonfly", target_os = "freebsd", target_os = "netbsd", target_os = "openbsd")))]
+impl SimpleTrait for LongItemInfo2 {}