Auto merge of #55803 - Mark-Simulacrum:rollup, r=Mark-Simulacrum

Rollup of 17 pull requests

Successful merges:

 - #55576 (Clarify error message for -C opt-level)
 - #55633 (Support memcpy/memmove with differing src/dst alignment)
 - #55638 (Fix ICE in msg_span_from_free_region on ReEmpty)
 - #55659 (rustc: Delete grouping logic from the musl target)
 - #55719 (Sidestep link error from rustfix'ed code by using a *defined* static.)
 - #55736 (Elide anon lifetimes in conflicting impl note)
 - #55739 (Consume optimization fuel from the MIR inliner)
 - #55742 (Avoid panic when matching function call)
 - #55753 (borrow_set: remove a helper function and a clone it uses)
 - #55755 (Improve creation of 3 IndexVecs)
 - #55758 ([regression - rust2018]: unused_mut lint false positives on nightly)
 - #55760 (Remove intermediate font specs)
 - #55761 (mir: remove a hacky recursive helper function)
 - #55774 (wasm32-unknown-emscripten expects the rust_eh_personality symbol)
 - #55777 (Use `Lit` rather than `P<Lit>` in `ast::ExprKind`.)
 - #55783 (Deprecate mpsc channel selection)
 - #55788 (rustc: Request ansi colors if stderr isn't a tty)

Failed merges:

r? @ghost

src/libpanic_abort/lib.rs

@@ -97,7 +97,10 @@ pub unsafe extern fn __rust_start_panic(_payload: usize) -> u32 {
 pub mod personalities {
     #[no_mangle]
     #[cfg(not(any(
-        target_arch = "wasm32",
+        all(
+            target_arch = "wasm32",
+            not(target_os = "emscripten"),
+        ),
         all(
             target_os = "windows",
             target_env = "gnu",

src/librustc/hir/lowering.rs

@@ -3705,7 +3705,7 @@ impl<'a> LoweringContext<'a> {
                 let ohs = P(self.lower_expr(ohs));
                 hir::ExprKind::Unary(op, ohs)
             }
-            ExprKind::Lit(ref l) => hir::ExprKind::Lit(P((**l).clone())),
+            ExprKind::Lit(ref l) => hir::ExprKind::Lit(P((*l).clone())),
             ExprKind::Cast(ref expr, ref ty) => {
                 let expr = P(self.lower_expr(expr));
                 hir::ExprKind::Cast(expr, self.lower_ty(ty, ImplTraitContext::disallowed()))

src/librustc/infer/error_reporting/mod.rs

@@ -178,6 +178,7 @@ impl<'a, 'gcx, 'tcx> TyCtxt<'a, 'gcx, 'tcx> {
                 self.msg_span_from_early_bound_and_free_regions(region)
             }
             ty::ReStatic => ("the static lifetime".to_owned(), None),
+            ty::ReEmpty => ("an empty lifetime".to_owned(), None),
             _ => bug!("{:?}", region),
         }
     }

src/librustc/mir/mod.rs

@@ -304,6 +304,20 @@ impl<'tcx> Mir<'tcx> {
         })
     }
 
+    /// Returns an iterator over all user-declared mutable locals.
+    #[inline]
+    pub fn mut_vars_iter<'a>(&'a self) -> impl Iterator<Item = Local> + 'a {
+        (self.arg_count + 1..self.local_decls.len()).filter_map(move |index| {
+            let local = Local::new(index);
+            let decl = &self.local_decls[local];
+            if decl.is_user_variable.is_some() && decl.mutability == Mutability::Mut {
+                Some(local)
+            } else {
+                None
+            }
+        })
+    }
+
     /// Returns an iterator over all user-declared mutable arguments and locals.
     #[inline]
     pub fn mut_vars_and_args_iter<'a>(&'a self) -> impl Iterator<Item = Local> + 'a {

src/librustc/session/config.rs

@@ -2082,7 +2082,7 @@ pub fn build_session_options_and_crate_config(
                         error_format,
                         &format!(
                             "optimization level needs to be \
-                             between 0-3 (instead was `{}`)",
+                             between 0-3, s or z (instead was `{}`)",
                             arg
                         ),
                     );

src/librustc/traits/specialize/mod.rs

@@ -396,7 +396,10 @@ fn to_pretty_impl_header(tcx: TyCtxt<'_, '_, '_>, impl_def_id: DefId) -> Option<
     if !substs.is_noop() {
         types_without_default_bounds.extend(substs.types());
         w.push('<');
-        w.push_str(&substs.iter().map(|k| k.to_string()).collect::<Vec<_>>().join(", "));
+        w.push_str(&substs.iter()
+            .map(|k| k.to_string())
+            .filter(|k| &k[..] != "'_")
+            .collect::<Vec<_>>().join(", "));
         w.push('>');
     }
 

src/librustc/ty/query/on_disk_cache.rs

@@ -450,8 +450,7 @@ impl<'sess> OnDiskCache<'sess> {
                                      .map(|&(cnum, ..)| cnum)
                                      .max()
                                      .unwrap_or(0) + 1;
-            let mut map = IndexVec::new();
-            map.resize(map_size as usize, None);
+            let mut map = IndexVec::from_elem_n(None, map_size as usize);
 
             for &(prev_cnum, ref crate_name, crate_disambiguator) in prev_cnums {
                 let key = (crate_name.clone(), crate_disambiguator);

src/librustc_codegen_llvm/abi.rs

@@ -225,9 +225,10 @@ impl ArgTypeExt<'ll, 'tcx> for ArgType<'tcx, Ty<'tcx>> {
                 // ...and then memcpy it to the intended destination.
                 base::call_memcpy(bx,
                                   bx.pointercast(dst.llval, Type::i8p(cx)),
+                                  self.layout.align,
                                   bx.pointercast(llscratch, Type::i8p(cx)),
+                                  scratch_align,
                                   C_usize(cx, self.layout.size.bytes()),
-                                  self.layout.align.min(scratch_align),
                                   MemFlags::empty());
 
                 bx.lifetime_end(llscratch, scratch_size);

src/librustc_codegen_llvm/base.rs

@@ -53,7 +53,7 @@ use mir::place::PlaceRef;
 use attributes;
 use builder::{Builder, MemFlags};
 use callee;
-use common::{C_bool, C_bytes_in_context, C_i32, C_usize};
+use common::{C_bool, C_bytes_in_context, C_usize};
 use rustc_mir::monomorphize::item::DefPathBasedNames;
 use common::{C_struct_in_context, C_array, val_ty};
 use consts;
@@ -77,7 +77,6 @@ use rustc_data_structures::sync::Lrc;
 use std::any::Any;
 use std::cmp;
 use std::ffi::CString;
-use std::i32;
 use std::ops::{Deref, DerefMut};
 use std::sync::mpsc;
 use std::time::{Instant, Duration};
@@ -319,8 +318,8 @@ pub fn coerce_unsized_into(
                 }
 
                 if src_f.layout.ty == dst_f.layout.ty {
-                    memcpy_ty(bx, dst_f.llval, src_f.llval, src_f.layout,
-                              src_f.align.min(dst_f.align), MemFlags::empty());
+                    memcpy_ty(bx, dst_f.llval, dst_f.align, src_f.llval, src_f.align,
+                              src_f.layout, MemFlags::empty());
                 } else {
                     coerce_unsized_into(bx, src_f, dst_f);
                 }
@@ -420,44 +419,42 @@ pub fn to_immediate_scalar(
 pub fn call_memcpy(
     bx: &Builder<'_, 'll, '_>,
     dst: &'ll Value,
+    dst_align: Align,
     src: &'ll Value,
+    src_align: Align,
     n_bytes: &'ll Value,
-    align: Align,
     flags: MemFlags,
 ) {
     if flags.contains(MemFlags::NONTEMPORAL) {
         // HACK(nox): This is inefficient but there is no nontemporal memcpy.
-        let val = bx.load(src, align);
+        let val = bx.load(src, src_align);
         let ptr = bx.pointercast(dst, val_ty(val).ptr_to());
-        bx.store_with_flags(val, ptr, align, flags);
+        bx.store_with_flags(val, ptr, dst_align, flags);
         return;
     }
     let cx = bx.cx;
-    let ptr_width = &cx.sess().target.target.target_pointer_width;
-    let key = format!("llvm.memcpy.p0i8.p0i8.i{}", ptr_width);
-    let memcpy = cx.get_intrinsic(&key);
     let src_ptr = bx.pointercast(src, Type::i8p(cx));
     let dst_ptr = bx.pointercast(dst, Type::i8p(cx));
     let size = bx.intcast(n_bytes, cx.isize_ty, false);
-    let align = C_i32(cx, align.abi() as i32);
-    let volatile = C_bool(cx, flags.contains(MemFlags::VOLATILE));
-    bx.call(memcpy, &[dst_ptr, src_ptr, size, align, volatile], None);
+    let volatile = flags.contains(MemFlags::VOLATILE);
+    bx.memcpy(dst_ptr, dst_align.abi(), src_ptr, src_align.abi(), size, volatile);
 }
 
 pub fn memcpy_ty(
     bx: &Builder<'_, 'll, 'tcx>,
     dst: &'ll Value,
+    dst_align: Align,
     src: &'ll Value,
+    src_align: Align,
     layout: TyLayout<'tcx>,
-    align: Align,
     flags: MemFlags,
 ) {
     let size = layout.size.bytes();
     if size == 0 {
         return;
     }
 
-    call_memcpy(bx, dst, src, C_usize(bx.cx, size), align, flags);
+    call_memcpy(bx, dst, dst_align, src, src_align, C_usize(bx.cx, size), flags);
 }
 
 pub fn call_memset(

src/librustc_codegen_llvm/builder.rs

@@ -781,6 +781,24 @@ impl Builder<'a, 'll, 'tcx> {
         }
     }
 
+    pub fn memcpy(&self, dst: &'ll Value, dst_align: u64,
+                  src: &'ll Value, src_align: u64,
+                  size: &'ll Value, is_volatile: bool) -> &'ll Value {
+        unsafe {
+            llvm::LLVMRustBuildMemCpy(self.llbuilder, dst, dst_align as c_uint,
+                                      src, src_align as c_uint, size, is_volatile)
+        }
+    }
+
+    pub fn memmove(&self, dst: &'ll Value, dst_align: u64,
+                  src: &'ll Value, src_align: u64,
+                  size: &'ll Value, is_volatile: bool) -> &'ll Value {
+        unsafe {
+            llvm::LLVMRustBuildMemMove(self.llbuilder, dst, dst_align as c_uint,
+                                      src, src_align as c_uint, size, is_volatile)
+        }
+    }
+
     pub fn minnum(&self, lhs: &'ll Value, rhs: &'ll Value) -> &'ll Value {
         self.count_insn("minnum");
         unsafe {

src/librustc_codegen_llvm/context.rs

@@ -530,12 +530,6 @@ fn declare_intrinsic(cx: &CodegenCx<'ll, '_>, key: &str) -> Option<&'ll Value> {
     let t_v4f64 = Type::vector(t_f64, 4);
     let t_v8f64 = Type::vector(t_f64, 8);
 
-    ifn!("llvm.memcpy.p0i8.p0i8.i16", fn(i8p, i8p, t_i16, t_i32, i1) -> void);
-    ifn!("llvm.memcpy.p0i8.p0i8.i32", fn(i8p, i8p, t_i32, t_i32, i1) -> void);
-    ifn!("llvm.memcpy.p0i8.p0i8.i64", fn(i8p, i8p, t_i64, t_i32, i1) -> void);
-    ifn!("llvm.memmove.p0i8.p0i8.i16", fn(i8p, i8p, t_i16, t_i32, i1) -> void);
-    ifn!("llvm.memmove.p0i8.p0i8.i32", fn(i8p, i8p, t_i32, t_i32, i1) -> void);
-    ifn!("llvm.memmove.p0i8.p0i8.i64", fn(i8p, i8p, t_i64, t_i32, i1) -> void);
     ifn!("llvm.memset.p0i8.i16", fn(i8p, t_i8, t_i16, t_i32, i1) -> void);
     ifn!("llvm.memset.p0i8.i32", fn(i8p, t_i8, t_i32, t_i32, i1) -> void);
     ifn!("llvm.memset.p0i8.i64", fn(i8p, t_i8, t_i64, t_i32, i1) -> void);

src/librustc_codegen_llvm/intrinsic.rs

@@ -23,7 +23,7 @@ use glue;
 use type_::Type;
 use type_of::LayoutLlvmExt;
 use rustc::ty::{self, Ty};
-use rustc::ty::layout::{HasDataLayout, LayoutOf};
+use rustc::ty::layout::LayoutOf;
 use rustc::hir;
 use syntax::ast;
 use syntax::symbol::Symbol;
@@ -690,28 +690,14 @@ fn copy_intrinsic(
     let cx = bx.cx;
     let (size, align) = cx.size_and_align_of(ty);
     let size = C_usize(cx, size.bytes());
-    let align = C_i32(cx, align.abi() as i32);
-
-    let operation = if allow_overlap {
-        "memmove"
-    } else {
-        "memcpy"
-    };
-
-    let name = format!("llvm.{}.p0i8.p0i8.i{}", operation,
-                       cx.data_layout().pointer_size.bits());
-
+    let align = align.abi();
     let dst_ptr = bx.pointercast(dst, Type::i8p(cx));
     let src_ptr = bx.pointercast(src, Type::i8p(cx));
-    let llfn = cx.get_intrinsic(&name);
-
-    bx.call(llfn,
-        &[dst_ptr,
-        src_ptr,
-        bx.mul(size, count),
-        align,
-        C_bool(cx, volatile)],
-        None)
+    if allow_overlap {
+        bx.memmove(dst_ptr, align, src_ptr, align, bx.mul(size, count), volatile)
+    } else {
+        bx.memcpy(dst_ptr, align, src_ptr, align, bx.mul(size, count), volatile)
+    }
 }
 
 fn memset_intrinsic(

src/librustc_codegen_llvm/llvm/ffi.rs

@@ -998,6 +998,22 @@ extern "C" {
                              Bundle: Option<&OperandBundleDef<'a>>,
                              Name: *const c_char)
                              -> &'a Value;
+    pub fn LLVMRustBuildMemCpy(B: &Builder<'a>,
+                               Dst: &'a Value,
+                               DstAlign: c_uint,
+                               Src: &'a Value,
+                               SrcAlign: c_uint,
+                               Size: &'a Value,
+                               IsVolatile: bool)
+                               -> &'a Value;
+    pub fn LLVMRustBuildMemMove(B: &Builder<'a>,
+                                Dst: &'a Value,
+                                DstAlign: c_uint,
+                                Src: &'a Value,
+                                SrcAlign: c_uint,
+                                Size: &'a Value,
+                                IsVolatile: bool)
+                                -> &'a Value;
     pub fn LLVMBuildSelect(B: &Builder<'a>,
                            If: &'a Value,
                            Then: &'a Value,

src/librustc_codegen_llvm/mir/block.rs

@@ -784,7 +784,8 @@ impl FunctionCx<'a, 'll, 'tcx> {
                     // have scary latent bugs around.
 
                     let scratch = PlaceRef::alloca(bx, arg.layout, "arg");
-                    base::memcpy_ty(bx, scratch.llval, llval, op.layout, align, MemFlags::empty());
+                    base::memcpy_ty(bx, scratch.llval, scratch.align, llval, align,
+                                    op.layout, MemFlags::empty());
                     (scratch.llval, scratch.align, true)
                 } else {
                     (llval, align, true)

src/librustc_codegen_llvm/mir/operand.rs

@@ -282,8 +282,8 @@ impl OperandValue<'ll> {
         }
         match self {
             OperandValue::Ref(r, None, source_align) => {
-                base::memcpy_ty(bx, dest.llval, r, dest.layout,
-                                source_align.min(dest.align), flags)
+                base::memcpy_ty(bx, dest.llval, dest.align, r, source_align,
+                                dest.layout, flags)
             }
             OperandValue::Ref(_, Some(_), _) => {
                 bug!("cannot directly store unsized values");
@@ -324,7 +324,7 @@ impl OperandValue<'ll> {
         // Allocate an appropriate region on the stack, and copy the value into it
         let (llsize, _) = glue::size_and_align_of_dst(&bx, unsized_ty, Some(llextra));
         let lldst = bx.array_alloca(Type::i8(bx.cx), llsize, "unsized_tmp", max_align);
-        base::call_memcpy(&bx, lldst, llptr, llsize, min_align, flags);
+        base::call_memcpy(&bx, lldst, max_align, llptr, min_align, llsize, flags);
 
         // Store the allocated region and the extra to the indirect place.
         let indirect_operand = OperandValue::Pair(lldst, llextra);

src/librustc_errors/emitter.rs

@@ -108,7 +108,13 @@ pub enum ColorConfig {
 impl ColorConfig {
     fn to_color_choice(&self) -> ColorChoice {
         match *self {
-            ColorConfig::Always => ColorChoice::Always,
+            ColorConfig::Always => {
+                if atty::is(atty::Stream::Stderr) {
+                    ColorChoice::Always
+                } else {
+                    ColorChoice::AlwaysAnsi
+                }
+            }
             ColorConfig::Never => ColorChoice::Never,
             ColorConfig::Auto if atty::is(atty::Stream::Stderr) => {
                 ColorChoice::Auto

src/librustc_mir/borrow_check/borrow_set.rs

@@ -21,7 +21,6 @@ use rustc::util::nodemap::{FxHashMap, FxHashSet};
 use rustc_data_structures::indexed_vec::IndexVec;
 use rustc_data_structures::bit_set::BitSet;
 use std::fmt;
-use std::hash::Hash;
 use std::ops::Index;
 
 crate struct BorrowSet<'tcx> {
@@ -233,21 +232,13 @@ impl<'a, 'gcx, 'tcx> Visitor<'tcx> for GatherBorrows<'a, 'gcx, 'tcx> {
 
             self.insert_as_pending_if_two_phase(location, &assigned_place, region, kind, idx);
 
-            insert(&mut self.region_map, &region, idx);
+            self.region_map.entry(region).or_default().insert(idx);
             if let Some(local) = borrowed_place.root_local() {
-                insert(&mut self.local_map, &local, idx);
+                self.local_map.entry(local).or_default().insert(idx);
             }
         }
 
-        return self.super_assign(block, assigned_place, rvalue, location);
-
-        fn insert<'a, K, V>(map: &'a mut FxHashMap<K, FxHashSet<V>>, k: &K, v: V)
-        where
-            K: Clone + Eq + Hash,
-            V: Eq + Hash,
-        {
-            map.entry(k.clone()).or_default().insert(v);
-        }
+        self.super_assign(block, assigned_place, rvalue, location)
     }
 
     fn visit_place(

src/librustc_mir/borrow_check/mod.rs

@@ -281,23 +281,21 @@ fn do_mir_borrowck<'a, 'gcx, 'tcx>(
     // Note that this set is expected to be small - only upvars from closures
     // would have a chance of erroneously adding non-user-defined mutable vars
     // to the set.
-    let temporary_used_locals: FxHashSet<Local> = mbcx
-        .used_mut
-        .iter()
+    let temporary_used_locals: FxHashSet<Local> = mbcx.used_mut.iter()
         .filter(|&local| mbcx.mir.local_decls[*local].is_user_variable.is_none())
         .cloned()
         .collect();
-    mbcx.gather_used_muts(temporary_used_locals);
+    // For the remaining unused locals that are marked as mutable, we avoid linting any that
+    // were never initialized. These locals may have been removed as unreachable code; or will be
+    // linted as unused variables.
+    let unused_mut_locals = mbcx.mir.mut_vars_iter()
+        .filter(|local| !mbcx.used_mut.contains(local))
+        .collect();
+    mbcx.gather_used_muts(temporary_used_locals, unused_mut_locals);
 
     debug!("mbcx.used_mut: {:?}", mbcx.used_mut);
-
     let used_mut = mbcx.used_mut;
-
-    for local in mbcx
-        .mir
-        .mut_vars_and_args_iter()
-        .filter(|local| !used_mut.contains(local))
-    {
+    for local in mbcx.mir.mut_vars_and_args_iter().filter(|local| !used_mut.contains(local)) {
         if let ClearCrossCrate::Set(ref vsi) = mbcx.mir.source_scope_local_data {
             let local_decl = &mbcx.mir.local_decls[local];