Auto merge of rust-lang#64886 - Centril:rollup-30dqh8j, r=Centril

Rollup of 5 pull requests

Successful merges:

 - rust-lang#63492 (Remove redundancy from the implementation of C variadics.)
 - rust-lang#64589 (Differentiate AArch64 bare-metal targets between hf and non-hf.)
 - rust-lang#64799 (Fix double panic when printing query stack during an ICE)
 - rust-lang#64824 (No StableHasherResult everywhere)
 - rust-lang#64884 (Add pkg-config to dependency list if building for Linux on Linux)

Failed merges:

r? @ghost

Author: bors

README.md

@@ -33,6 +33,7 @@ or reading the [rustc guide][rustcguidebuild].
    * `curl`
    * `git`
    * `ssl` which comes in `libssl-dev` or `openssl-devel`
+   * `pkg-config` if you are on compiling on Linux and targeting Linux
 
 2. Clone the [source] with `git`:
 

src/librustc/hir/intravisit.rs

@@ -633,9 +633,6 @@ pub fn walk_ty<'v, V: Visitor<'v>>(visitor: &mut V, typ: &'v Ty) {
         TyKind::Typeof(ref expression) => {
             visitor.visit_anon_const(expression)
         }
-        TyKind::CVarArgs(ref lt) => {
-            visitor.visit_lifetime(lt)
-        }
         TyKind::Infer | TyKind::Err => {}
     }
 }

src/librustc/hir/lowering.rs

@@ -1335,13 +1335,8 @@ impl<'a> LoweringContext<'a> {
                     }
                 }
             }
-            TyKind::Mac(_) => bug!("`TyMac` should have been expanded by now"),
-            TyKind::CVarArgs => {
-                // Create the implicit lifetime of the "spoofed" `VaListImpl`.
-                let span = self.sess.source_map().next_point(t.span.shrink_to_lo());
-                let lt = self.new_implicit_lifetime(span);
-                hir::TyKind::CVarArgs(lt)
-            },
+            TyKind::Mac(_) => bug!("`TyKind::Mac` should have been expanded by now"),
+            TyKind::CVarArgs => bug!("`TyKind::CVarArgs` should have been handled elsewhere"),
         };
 
         hir::Ty {
@@ -2093,7 +2088,14 @@ impl<'a> LoweringContext<'a> {
     }
 
     fn lower_fn_params_to_names(&mut self, decl: &FnDecl) -> hir::HirVec<Ident> {
-        decl.inputs
+        // Skip the `...` (`CVarArgs`) trailing arguments from the AST,
+        // as they are not explicit in HIR/Ty function signatures.
+        // (instead, the `c_variadic` flag is set to `true`)
+        let mut inputs = &decl.inputs[..];
+        if decl.c_variadic() {
+            inputs = &inputs[..inputs.len() - 1];
+        }
+        inputs
             .iter()
             .map(|param| match param.pat.kind {
                 PatKind::Ident(_, ident, _) => ident,
@@ -2130,10 +2132,19 @@ impl<'a> LoweringContext<'a> {
             self.anonymous_lifetime_mode
         };
 
+        let c_variadic = decl.c_variadic();
+
         // Remember how many lifetimes were already around so that we can
         // only look at the lifetime parameters introduced by the arguments.
         let inputs = self.with_anonymous_lifetime_mode(lt_mode, |this| {
-            decl.inputs
+            // Skip the `...` (`CVarArgs`) trailing arguments from the AST,
+            // as they are not explicit in HIR/Ty function signatures.
+            // (instead, the `c_variadic` flag is set to `true`)
+            let mut inputs = &decl.inputs[..];
+            if c_variadic {
+                inputs = &inputs[..inputs.len() - 1];
+            }
+            inputs
                 .iter()
                 .map(|param| {
                     if let Some((_, ibty)) = &mut in_band_ty_params {
@@ -2168,7 +2179,7 @@ impl<'a> LoweringContext<'a> {
         P(hir::FnDecl {
             inputs,
             output,
-            c_variadic: decl.c_variadic,
+            c_variadic,
             implicit_self: decl.inputs.get(0).map_or(
                 hir::ImplicitSelfKind::None,
                 |arg| {

src/librustc/hir/lowering/expr.rs

@@ -450,7 +450,6 @@ impl LoweringContext<'_> {
         let ast_decl = FnDecl {
             inputs: vec![],
             output,
-            c_variadic: false
         };
         let decl = self.lower_fn_decl(&ast_decl, None, /* impl trait allowed */ false, None);
         let body_id = self.lower_fn_body(&ast_decl, |this| {
@@ -739,7 +738,6 @@ impl LoweringContext<'_> {
         let outer_decl = FnDecl {
             inputs: decl.inputs.clone(),
             output: FunctionRetTy::Default(fn_decl_span),
-            c_variadic: false,
         };
         // We need to lower the declaration outside the new scope, because we
         // have to conserve the state of being inside a loop condition for the

src/librustc/hir/map/collector.rs

@@ -17,7 +17,7 @@ use syntax_pos::Span;
 use std::iter::repeat;
 
 use crate::ich::StableHashingContext;
-use rustc_data_structures::stable_hasher::{HashStable, StableHasher, StableHasherResult};
+use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
 
 /// A visitor that walks over the HIR and collects `Node`s into a HIR map.
 pub(super) struct NodeCollector<'a, 'hir> {
@@ -602,9 +602,7 @@ impl<'hir, T> HashStable<StableHashingContext<'hir>> for HirItemLike<T>
 where
     T: HashStable<StableHashingContext<'hir>>,
 {
-    fn hash_stable<W: StableHasherResult>(&self,
-                                          hcx: &mut StableHashingContext<'hir>,
-                                          hasher: &mut StableHasher<W>) {
+    fn hash_stable(&self, hcx: &mut StableHashingContext<'hir>, hasher: &mut StableHasher) {
         hcx.while_hashing_hir_bodies(self.hash_bodies, |hcx| {
             self.item_like.hash_stable(hcx, hasher);
         });

src/librustc/hir/mod.rs

@@ -2016,9 +2016,6 @@ pub enum TyKind {
     Infer,
     /// Placeholder for a type that has failed to be defined.
     Err,
-    /// Placeholder for C-variadic arguments. We "spoof" the `VaListImpl` created
-    /// from the variadic arguments. This type is only valid up to typeck.
-    CVarArgs(Lifetime),
 }
 
 #[derive(Copy, Clone, RustcEncodable, RustcDecodable, Debug, HashStable)]

src/librustc/hir/print.rs

@@ -361,9 +361,6 @@ impl<'a> State<'a> {
                 self.s.word("/*ERROR*/");
                 self.pclose();
             }
-            hir::TyKind::CVarArgs(_) => {
-                self.s.word("...");
-            }
         }
         self.end()
     }

src/librustc/hir/ptr.rs

@@ -9,8 +9,7 @@ use std::{slice, vec};
 
 use rustc_serialize::{Encodable, Decodable, Encoder, Decoder};
 
-use rustc_data_structures::stable_hasher::{StableHasher, StableHasherResult,
-                                           HashStable};
+use rustc_data_structures::stable_hasher::{StableHasher, HashStable};
 /// An owned smart pointer.
 #[derive(Hash, PartialEq, Eq)]
 pub struct P<T: ?Sized> {
@@ -133,9 +132,7 @@ impl<T: Decodable> Decodable for P<[T]> {
 impl<CTX, T> HashStable<CTX> for P<T>
     where T: ?Sized + HashStable<CTX>
 {
-    fn hash_stable<W: StableHasherResult>(&self,
-                                          hcx: &mut CTX,
-                                          hasher: &mut StableHasher<W>) {
+    fn hash_stable(&self, hcx: &mut CTX, hasher: &mut StableHasher) {
         (**self).hash_stable(hcx, hasher);
     }
 }

src/librustc/ich/hcx.rs

@@ -20,7 +20,7 @@ use syntax_pos::{Span, DUMMY_SP};
 use syntax_pos::hygiene;
 
 use rustc_data_structures::stable_hasher::{
-    HashStable, StableHasher, StableHasherResult, ToStableHashKey,
+    HashStable, StableHasher, ToStableHashKey,
 };
 use rustc_data_structures::fx::{FxHashSet, FxHashMap};
 use smallvec::SmallVec;
@@ -219,9 +219,7 @@ impl<'a> StableHashingContextProvider<'a> for StableHashingContext<'a> {
 impl<'a> crate::dep_graph::DepGraphSafe for StableHashingContext<'a> {}
 
 impl<'a> HashStable<StableHashingContext<'a>> for hir::BodyId {
-    fn hash_stable<W: StableHasherResult>(&self,
-                                          hcx: &mut StableHashingContext<'a>,
-                                          hasher: &mut StableHasher<W>) {
+    fn hash_stable(&self, hcx: &mut StableHashingContext<'a>, hasher: &mut StableHasher) {
         if hcx.hash_bodies() {
             hcx.body_resolver.body(*self).hash_stable(hcx, hasher);
         }
@@ -230,9 +228,7 @@ impl<'a> HashStable<StableHashingContext<'a>> for hir::BodyId {
 
 impl<'a> HashStable<StableHashingContext<'a>> for hir::HirId {
     #[inline]
-    fn hash_stable<W: StableHasherResult>(&self,
-                                          hcx: &mut StableHashingContext<'a>,
-                                          hasher: &mut StableHasher<W>) {
+    fn hash_stable(&self, hcx: &mut StableHashingContext<'a>, hasher: &mut StableHasher) {
         match hcx.node_id_hashing_mode {
             NodeIdHashingMode::Ignore => {
                 // Don't do anything.
@@ -263,9 +259,7 @@ impl<'a> ToStableHashKey<StableHashingContext<'a>> for hir::HirId {
 }
 
 impl<'a> HashStable<StableHashingContext<'a>> for ast::NodeId {
-    fn hash_stable<W: StableHasherResult>(&self,
-                                          hcx: &mut StableHashingContext<'a>,
-                                          hasher: &mut StableHasher<W>) {
+    fn hash_stable(&self, hcx: &mut StableHashingContext<'a>, hasher: &mut StableHasher) {
         match hcx.node_id_hashing_mode {
             NodeIdHashingMode::Ignore => {
                 // Don't do anything.
@@ -298,9 +292,7 @@ impl<'a> HashStable<StableHashingContext<'a>> for Span {
     /// codepoint offsets. For the purpose of the hash that's sufficient.
     /// Also, hashing filenames is expensive so we avoid doing it twice when the
     /// span starts and ends in the same file, which is almost always the case.
-    fn hash_stable<W: StableHasherResult>(&self,
-                                          hcx: &mut StableHashingContext<'a>,
-                                          hasher: &mut StableHasher<W>) {
+    fn hash_stable(&self, hcx: &mut StableHashingContext<'a>, hasher: &mut StableHasher) {
         const TAG_VALID_SPAN: u8 = 0;
         const TAG_INVALID_SPAN: u8 = 1;
         const TAG_EXPANSION: u8 = 0;
@@ -379,24 +371,18 @@ impl<'a> HashStable<StableHashingContext<'a>> for Span {
 }
 
 impl<'a> HashStable<StableHashingContext<'a>> for DelimSpan {
-    fn hash_stable<W: StableHasherResult>(
-        &self,
-        hcx: &mut StableHashingContext<'a>,
-        hasher: &mut StableHasher<W>,
-    ) {
+    fn hash_stable(&self, hcx: &mut StableHashingContext<'a>, hasher: &mut StableHasher) {
         self.open.hash_stable(hcx, hasher);
         self.close.hash_stable(hcx, hasher);
     }
 }
 
-pub fn hash_stable_trait_impls<'a, W>(
+pub fn hash_stable_trait_impls<'a>(
     hcx: &mut StableHashingContext<'a>,
-    hasher: &mut StableHasher<W>,
+    hasher: &mut StableHasher,
     blanket_impls: &[DefId],
     non_blanket_impls: &FxHashMap<fast_reject::SimplifiedType, Vec<DefId>>,
-) where
-    W: StableHasherResult,
-{
+) {
     {
         let mut blanket_impls: SmallVec<[_; 8]> = blanket_impls
             .iter()