Rollup of 7 pull requests

compiler/rustc_ast_lowering/src/expr.rs

@@ -34,7 +34,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
                 }
                 ExprKind::Repeat(ref expr, ref count) => {
                     let expr = self.lower_expr(expr);
-                    let count = self.lower_anon_const(count);
+                    let count = self.lower_array_length(count);
                     hir::ExprKind::Repeat(expr, count)
                 }
                 ExprKind::Tup(ref elts) => hir::ExprKind::Tup(self.lower_exprs(elts)),

compiler/rustc_ast_lowering/src/lib.rs

@@ -56,6 +56,7 @@ use rustc_hir::{ConstArg, GenericArg, ParamName};
 use rustc_index::vec::{Idx, IndexVec};
 use rustc_query_system::ich::StableHashingContext;
 use rustc_session::lint::LintBuffer;
+use rustc_session::parse::feature_err;
 use rustc_session::utils::{FlattenNonterminals, NtToTokenstream};
 use rustc_session::Session;
 use rustc_span::hygiene::ExpnId;
@@ -1248,7 +1249,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
                 ))
             }
             TyKind::Array(ref ty, ref length) => {
-                hir::TyKind::Array(self.lower_ty(ty, itctx), self.lower_anon_const(length))
+                hir::TyKind::Array(self.lower_ty(ty, itctx), self.lower_array_length(length))
             }
             TyKind::Typeof(ref expr) => hir::TyKind::Typeof(self.lower_anon_const(expr)),
             TyKind::TraitObject(ref bounds, kind) => {
@@ -2039,6 +2040,26 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
         self.expr_block(block, AttrVec::new())
     }
 
+    fn lower_array_length(&mut self, c: &AnonConst) -> hir::ArrayLen {
+        match c.value.kind {
+            ExprKind::Underscore => {
+                if self.sess.features_untracked().generic_arg_infer {
+                    hir::ArrayLen::Infer(self.lower_node_id(c.id), c.value.span)
+                } else {
+                    feature_err(
+                        &self.sess.parse_sess,
+                        sym::generic_arg_infer,
+                        c.value.span,
+                        "using `_` for array lengths is unstable",
+                    )
+                    .emit();
+                    hir::ArrayLen::Body(self.lower_anon_const(c))
+                }
+            }
+            _ => hir::ArrayLen::Body(self.lower_anon_const(c)),
+        }
+    }
+
     fn lower_anon_const(&mut self, c: &AnonConst) -> hir::AnonConst {
         self.with_new_scopes(|this| hir::AnonConst {
             hir_id: this.lower_node_id(c.id),

compiler/rustc_codegen_llvm/src/debuginfo/mod.rs

@@ -160,17 +160,17 @@ impl<'ll> DebugInfoBuilderMethods for Builder<'_, 'll, '_> {
         // the values should match the ones in the DWARF standard anyway.
         let op_deref = || unsafe { llvm::LLVMRustDIBuilderCreateOpDeref() };
         let op_plus_uconst = || unsafe { llvm::LLVMRustDIBuilderCreateOpPlusUconst() };
-        let mut addr_ops = SmallVec::<[_; 8]>::new();
+        let mut addr_ops = SmallVec::<[u64; 8]>::new();
 
         if direct_offset.bytes() > 0 {
             addr_ops.push(op_plus_uconst());
-            addr_ops.push(direct_offset.bytes() as i64);
+            addr_ops.push(direct_offset.bytes() as u64);
         }
         for &offset in indirect_offsets {
             addr_ops.push(op_deref());
             if offset.bytes() > 0 {
                 addr_ops.push(op_plus_uconst());
-                addr_ops.push(offset.bytes() as i64);
+                addr_ops.push(offset.bytes() as u64);
             }
         }
 

compiler/rustc_codegen_llvm/src/llvm/ffi.rs

@@ -2108,7 +2108,7 @@ extern "C" {
         Builder: &DIBuilder<'a>,
         Val: &'a Value,
         VarInfo: &'a DIVariable,
-        AddrOps: *const i64,
+        AddrOps: *const u64,
         AddrOpsCount: c_uint,
         DL: &'a DILocation,
         InsertAtEnd: &'a BasicBlock,
@@ -2199,8 +2199,8 @@ extern "C" {
         Scope: &'a DIScope,
         InlinedAt: Option<&'a DILocation>,
     ) -> &'a DILocation;
-    pub fn LLVMRustDIBuilderCreateOpDeref() -> i64;
-    pub fn LLVMRustDIBuilderCreateOpPlusUconst() -> i64;
+    pub fn LLVMRustDIBuilderCreateOpDeref() -> u64;
+    pub fn LLVMRustDIBuilderCreateOpPlusUconst() -> u64;
 
     #[allow(improper_ctypes)]
     pub fn LLVMRustWriteTypeToString(Type: &Type, s: &RustString);

compiler/rustc_const_eval/src/const_eval/eval_queries.rs

@@ -63,7 +63,7 @@ fn eval_body_using_ecx<'mir, 'tcx>(
         cid.instance,
         body,
         Some(&ret.into()),
-        StackPopCleanup::None { cleanup: false },
+        StackPopCleanup::Root { cleanup: false },
     )?;
 
     // The main interpreter loop.

compiler/rustc_const_eval/src/interpret/eval_context.rs

@@ -156,11 +156,11 @@ pub enum StackPopCleanup {
     /// `ret` stores the block we jump to on a normal return, while `unwind`
     /// stores the block used for cleanup during unwinding.
     Goto { ret: Option<mir::BasicBlock>, unwind: StackPopUnwind },
-    /// Just do nothing: Used by Main and for TLS hooks in miri.
+    /// The root frame of the stack: nowhere else to jump to.
     /// `cleanup` says whether locals are deallocated. Static computation
     /// wants them leaked to intern what they need (and just throw away
     /// the entire `ecx` when it is done).
-    None { cleanup: bool },
+    Root { cleanup: bool },
 }
 
 /// State of a local variable including a memoized layout
@@ -849,7 +849,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
         // because this is CTFE and the final value will be thoroughly validated anyway.
         let cleanup = match return_to_block {
             StackPopCleanup::Goto { .. } => true,
-            StackPopCleanup::None { cleanup, .. } => cleanup,
+            StackPopCleanup::Root { cleanup, .. } => cleanup,
         };
 
         if !cleanup {
@@ -874,16 +874,22 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
             // Follow the unwind edge.
             let unwind = match return_to_block {
                 StackPopCleanup::Goto { unwind, .. } => unwind,
-                StackPopCleanup::None { .. } => {
-                    panic!("Encountered StackPopCleanup::None when unwinding!")
+                StackPopCleanup::Root { .. } => {
+                    panic!("encountered StackPopCleanup::Root when unwinding!")
                 }
             };
             self.unwind_to_block(unwind)
         } else {
             // Follow the normal return edge.
             match return_to_block {
                 StackPopCleanup::Goto { ret, .. } => self.return_to_block(ret),
-                StackPopCleanup::None { .. } => Ok(()),
+                StackPopCleanup::Root { .. } => {
+                    assert!(
+                        self.stack().is_empty(),
+                        "only the topmost frame can have StackPopCleanup::Root"
+                    );
+                    Ok(())
+                }
             }
         }
     }

compiler/rustc_hir/src/hir.rs

@@ -1407,6 +1407,20 @@ impl fmt::Display for ConstContext {
 /// A literal.
 pub type Lit = Spanned<LitKind>;
 
+#[derive(Copy, Clone, PartialEq, Eq, Encodable, Debug, HashStable_Generic)]
+pub enum ArrayLen {
+    Infer(HirId, Span),
+    Body(AnonConst),
+}
+
+impl ArrayLen {
+    pub fn hir_id(&self) -> HirId {
+        match self {
+            &ArrayLen::Infer(hir_id, _) | &ArrayLen::Body(AnonConst { hir_id, body: _ }) => hir_id,
+        }
+    }
+}
+
 /// A constant (expression) that's not an item or associated item,
 /// but needs its own `DefId` for type-checking, const-eval, etc.
 /// These are usually found nested inside types (e.g., array lengths)
@@ -1756,7 +1770,7 @@ pub enum ExprKind<'hir> {
     ///
     /// E.g., `[1; 5]`. The first expression is the element
     /// to be repeated; the second is the number of times to repeat it.
-    Repeat(&'hir Expr<'hir>, AnonConst),
+    Repeat(&'hir Expr<'hir>, ArrayLen),
 
     /// A suspension point for generators (i.e., `yield <expr>`).
     Yield(&'hir Expr<'hir>, YieldSource),
@@ -2266,7 +2280,7 @@ pub enum TyKind<'hir> {
     /// A variable length slice (i.e., `[T]`).
     Slice(&'hir Ty<'hir>),
     /// A fixed length array (i.e., `[T; n]`).
-    Array(&'hir Ty<'hir>, AnonConst),
+    Array(&'hir Ty<'hir>, ArrayLen),
     /// A raw pointer (i.e., `*const T` or `*mut T`).
     Ptr(MutTy<'hir>),
     /// A reference (i.e., `&'a T` or `&'a mut T`).

compiler/rustc_hir/src/intravisit.rs

@@ -383,6 +383,9 @@ pub trait Visitor<'v>: Sized {
     fn visit_pat(&mut self, p: &'v Pat<'v>) {
         walk_pat(self, p)
     }
+    fn visit_array_length(&mut self, len: &'v ArrayLen) {
+        walk_array_len(self, len)
+    }
     fn visit_anon_const(&mut self, c: &'v AnonConst) {
         walk_anon_const(self, c)
     }
@@ -753,7 +756,7 @@ pub fn walk_ty<'v, V: Visitor<'v>>(visitor: &mut V, typ: &'v Ty<'v>) {
         }
         TyKind::Array(ref ty, ref length) => {
             visitor.visit_ty(ty);
-            visitor.visit_anon_const(length)
+            visitor.visit_array_length(length)
         }
         TyKind::TraitObject(bounds, ref lifetime, _syntax) => {
             for bound in bounds {
@@ -1124,6 +1127,13 @@ pub fn walk_stmt<'v, V: Visitor<'v>>(visitor: &mut V, statement: &'v Stmt<'v>) {
     }
 }
 
+pub fn walk_array_len<'v, V: Visitor<'v>>(visitor: &mut V, len: &'v ArrayLen) {
+    match len {
+        &ArrayLen::Infer(hir_id, _span) => visitor.visit_id(hir_id),
+        ArrayLen::Body(c) => visitor.visit_anon_const(c),
+    }
+}
+
 pub fn walk_anon_const<'v, V: Visitor<'v>>(visitor: &mut V, constant: &'v AnonConst) {
     visitor.visit_id(constant.hir_id);
     visitor.visit_nested_body(constant.body);
@@ -1147,7 +1157,7 @@ pub fn walk_expr<'v, V: Visitor<'v>>(visitor: &mut V, expression: &'v Expr<'v>)
         ExprKind::ConstBlock(ref anon_const) => visitor.visit_anon_const(anon_const),
         ExprKind::Repeat(ref element, ref count) => {
             visitor.visit_expr(element);
-            visitor.visit_anon_const(count)
+            visitor.visit_array_length(count)
         }
         ExprKind::Struct(ref qpath, fields, ref optional_base) => {
             visitor.visit_qpath(qpath, expression.hir_id, expression.span);

compiler/rustc_hir_pretty/src/lib.rs

@@ -358,7 +358,7 @@ impl<'a> State<'a> {
                 self.word("[");
                 self.print_type(&ty);
                 self.word("; ");
-                self.print_anon_const(length);
+                self.print_array_length(length);
                 self.word("]");
             }
             hir::TyKind::Typeof(ref e) => {
@@ -1065,6 +1065,13 @@ impl<'a> State<'a> {
         self.print_else(elseopt)
     }
 
+    pub fn print_array_length(&mut self, len: &hir::ArrayLen) {
+        match len {
+            hir::ArrayLen::Infer(_, _) => self.word("_"),
+            hir::ArrayLen::Body(ct) => self.print_anon_const(ct),
+        }
+    }
+
     pub fn print_anon_const(&mut self, constant: &hir::AnonConst) {
         self.ann.nested(self, Nested::Body(constant.body))
     }
@@ -1140,12 +1147,12 @@ impl<'a> State<'a> {
         self.end()
     }
 
-    fn print_expr_repeat(&mut self, element: &hir::Expr<'_>, count: &hir::AnonConst) {
+    fn print_expr_repeat(&mut self, element: &hir::Expr<'_>, count: &hir::ArrayLen) {
         self.ibox(INDENT_UNIT);
         self.word("[");
         self.print_expr(element);
         self.word_space(";");
-        self.print_anon_const(count);
+        self.print_array_length(count);
         self.word("]");
         self.end()
     }

compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp

@@ -979,11 +979,11 @@ LLVMRustDIBuilderGetOrCreateArray(LLVMRustDIBuilderRef Builder,
 
 extern "C" LLVMValueRef LLVMRustDIBuilderInsertDeclareAtEnd(
     LLVMRustDIBuilderRef Builder, LLVMValueRef V, LLVMMetadataRef VarInfo,
-    int64_t *AddrOps, unsigned AddrOpsCount, LLVMMetadataRef DL,
+    uint64_t *AddrOps, unsigned AddrOpsCount, LLVMMetadataRef DL,
     LLVMBasicBlockRef InsertAtEnd) {
   return wrap(Builder->insertDeclare(
       unwrap(V), unwrap<DILocalVariable>(VarInfo),
-      Builder->createExpression(llvm::ArrayRef<int64_t>(AddrOps, AddrOpsCount)),
+      Builder->createExpression(llvm::ArrayRef<uint64_t>(AddrOps, AddrOpsCount)),
       DebugLoc(cast<MDNode>(unwrap(DL))),
       unwrap(InsertAtEnd)));
 }
@@ -1057,11 +1057,11 @@ LLVMRustDIBuilderCreateDebugLocation(unsigned Line, unsigned Column,
   return wrap(Loc);
 }
 
-extern "C" int64_t LLVMRustDIBuilderCreateOpDeref() {
+extern "C" uint64_t LLVMRustDIBuilderCreateOpDeref() {
   return dwarf::DW_OP_deref;
 }
 
-extern "C" int64_t LLVMRustDIBuilderCreateOpPlusUconst() {
+extern "C" uint64_t LLVMRustDIBuilderCreateOpPlusUconst() {
   return dwarf::DW_OP_plus_uconst;
 }
 

compiler/rustc_mir_build/src/thir/cx/expr.rs

@@ -583,9 +583,12 @@ impl<'tcx> Cx<'tcx> {
                 ExprKind::ConstBlock { value }
             }
             // Now comes the rote stuff:
-            hir::ExprKind::Repeat(ref v, ref count) => {
-                let count_def_id = self.tcx.hir().local_def_id(count.hir_id);
-                let count = ty::Const::from_anon_const(self.tcx, count_def_id);
+            hir::ExprKind::Repeat(ref v, _) => {
+                let ty = self.typeck_results().expr_ty(expr);
+                let count = match ty.kind() {
+                    ty::Array(_, ct) => ct,
+                    _ => span_bug!(expr.span, "unexpected repeat expr ty: {:?}", ty),
+                };
 
                 ExprKind::Repeat { value: self.mirror_expr(v), count }
             }

compiler/rustc_mir_transform/src/const_prop.rs

@@ -406,7 +406,7 @@ impl<'mir, 'tcx> ConstPropagator<'mir, 'tcx> {
             Instance::new(def_id, substs),
             dummy_body,
             ret.as_ref(),
-            StackPopCleanup::None { cleanup: false },
+            StackPopCleanup::Root { cleanup: false },
         )
         .expect("failed to push initial stack frame");
 

compiler/rustc_save_analysis/src/dump_visitor.rs

@@ -1326,12 +1326,18 @@ impl<'tcx> Visitor<'tcx> for DumpVisitor<'tcx> {
                 }
                 intravisit::walk_qpath(self, path, t.hir_id, t.span);
             }
-            hir::TyKind::Array(ref ty, ref anon_const) => {
+            hir::TyKind::Array(ref ty, ref length) => {
                 self.visit_ty(ty);
                 let map = self.tcx.hir();
-                self.nest_typeck_results(self.tcx.hir().local_def_id(anon_const.hir_id), |v| {
-                    v.visit_expr(&map.body(anon_const.body).value)
-                });
+                match length {
+                    // FIXME(generic_arg_infer): We probably want to
+                    // output the inferred type here? :shrug:
+                    hir::ArrayLen::Infer(..) => {}
+                    hir::ArrayLen::Body(anon_const) => self
+                        .nest_typeck_results(self.tcx.hir().local_def_id(anon_const.hir_id), |v| {
+                            v.visit_expr(&map.body(anon_const.body).value)
+                        }),
+                }
             }
             hir::TyKind::OpaqueDef(item_id, _) => {
                 let item = self.tcx.hir().item(item_id);
@@ -1390,12 +1396,18 @@ impl<'tcx> Visitor<'tcx> for DumpVisitor<'tcx> {
                     v.visit_expr(&body.value)
                 });
             }
-            hir::ExprKind::Repeat(ref expr, ref anon_const) => {
+            hir::ExprKind::Repeat(ref expr, ref length) => {
                 self.visit_expr(expr);
                 let map = self.tcx.hir();
-                self.nest_typeck_results(self.tcx.hir().local_def_id(anon_const.hir_id), |v| {
-                    v.visit_expr(&map.body(anon_const.body).value)
-                });
+                match length {
+                    // FIXME(generic_arg_infer): We probably want to
+                    // output the inferred type here? :shrug:
+                    hir::ArrayLen::Infer(..) => {}
+                    hir::ArrayLen::Body(anon_const) => self
+                        .nest_typeck_results(self.tcx.hir().local_def_id(anon_const.hir_id), |v| {
+                            v.visit_expr(&map.body(anon_const.body).value)
+                        }),
+                }
             }
             // In particular, we take this branch for call and path expressions,
             // where we'll index the idents involved just by continuing to walk.

compiler/rustc_save_analysis/src/sig.rs

@@ -310,9 +310,9 @@ impl<'hir> Sig for hir::Ty<'hir> {
                 let nested = bounds_to_string(&bounds);
                 Ok(text_sig(nested))
             }
-            hir::TyKind::Array(ref ty, ref anon_const) => {
+            hir::TyKind::Array(ref ty, ref length) => {
                 let nested_ty = ty.make(offset + 1, id, scx)?;
-                let expr = id_to_string(&scx.tcx.hir(), anon_const.body.hir_id).replace('\n', " ");
+                let expr = id_to_string(&scx.tcx.hir(), length.hir_id()).replace('\n', " ");
                 let text = format!("[{}; {}]", nested_ty.text, expr);
                 Ok(replace_text(nested_ty, text))
             }

compiler/rustc_typeck/src/astconv/generics.rs

@@ -104,7 +104,7 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
                 GenericArg::Type(hir::Ty { kind: hir::TyKind::Array(_, len), .. }),
                 GenericParamDefKind::Const { .. },
             ) if tcx.type_of(param.def_id) == tcx.types.usize => {
-                let snippet = sess.source_map().span_to_snippet(tcx.hir().span(len.hir_id));
+                let snippet = sess.source_map().span_to_snippet(tcx.hir().span(len.hir_id()));
                 if let Ok(snippet) = snippet {
                     err.span_suggestion(
                         arg.span(),