Merge from rustc

compiler/rustc_ast/src/util/classify.rs

@@ -81,8 +81,17 @@ pub fn expr_requires_semi_to_be_stmt(e: &ast::Expr) -> bool {
     }
 }
 
+pub enum TrailingBrace<'a> {
+    /// Trailing brace in a macro call, like the one in `x as *const brace! {}`.
+    /// We will suggest changing the macro call to a different delimiter.
+    MacCall(&'a ast::MacCall),
+    /// Trailing brace in any other expression, such as `a + B {}`. We will
+    /// suggest wrapping the innermost expression in parentheses: `a + (B {})`.
+    Expr(&'a ast::Expr),
+}
+
 /// If an expression ends with `}`, returns the innermost expression ending in the `}`
-pub fn expr_trailing_brace(mut expr: &ast::Expr) -> Option<&ast::Expr> {
+pub fn expr_trailing_brace(mut expr: &ast::Expr) -> Option<TrailingBrace<'_>> {
     loop {
         match &expr.kind {
             AddrOf(_, _, e)
@@ -111,10 +120,14 @@ pub fn expr_trailing_brace(mut expr: &ast::Expr) -> Option<&ast::Expr> {
             | Struct(..)
             | TryBlock(..)
             | While(..)
-            | ConstBlock(_) => break Some(expr),
+            | ConstBlock(_) => break Some(TrailingBrace::Expr(expr)),
+
+            Cast(_, ty) => {
+                break type_trailing_braced_mac_call(ty).map(TrailingBrace::MacCall);
+            }
 
             MacCall(mac) => {
-                break (mac.args.delim == Delimiter::Brace).then_some(expr);
+                break (mac.args.delim == Delimiter::Brace).then_some(TrailingBrace::MacCall(mac));
             }
 
             InlineAsm(_) | OffsetOf(_, _) | IncludedBytes(_) | FormatArgs(_) => {
@@ -131,7 +144,6 @@ pub fn expr_trailing_brace(mut expr: &ast::Expr) -> Option<&ast::Expr> {
             | MethodCall(_)
             | Tup(_)
             | Lit(_)
-            | Cast(_, _)
             | Type(_, _)
             | Await(_, _)
             | Field(_, _)
@@ -148,3 +160,78 @@ pub fn expr_trailing_brace(mut expr: &ast::Expr) -> Option<&ast::Expr> {
         }
     }
 }
+
+/// If the type's last token is `}`, it must be due to a braced macro call, such
+/// as in `*const brace! { ... }`. Returns that trailing macro call.
+fn type_trailing_braced_mac_call(mut ty: &ast::Ty) -> Option<&ast::MacCall> {
+    loop {
+        match &ty.kind {
+            ast::TyKind::MacCall(mac) => {
+                break (mac.args.delim == Delimiter::Brace).then_some(mac);
+            }
+
+            ast::TyKind::Ptr(mut_ty) | ast::TyKind::Ref(_, mut_ty) => {
+                ty = &mut_ty.ty;
+            }
+
+            ast::TyKind::BareFn(fn_ty) => match &fn_ty.decl.output {
+                ast::FnRetTy::Default(_) => break None,
+                ast::FnRetTy::Ty(ret) => ty = ret,
+            },
+
+            ast::TyKind::Path(_, path) => match path_return_type(path) {
+                Some(trailing_ty) => ty = trailing_ty,
+                None => break None,
+            },
+
+            ast::TyKind::TraitObject(bounds, _) | ast::TyKind::ImplTrait(_, bounds, _) => {
+                match bounds.last() {
+                    Some(ast::GenericBound::Trait(bound, _)) => {
+                        match path_return_type(&bound.trait_ref.path) {
+                            Some(trailing_ty) => ty = trailing_ty,
+                            None => break None,
+                        }
+                    }
+                    Some(ast::GenericBound::Outlives(_)) | None => break None,
+                }
+            }
+
+            ast::TyKind::Slice(..)
+            | ast::TyKind::Array(..)
+            | ast::TyKind::Never
+            | ast::TyKind::Tup(..)
+            | ast::TyKind::Paren(..)
+            | ast::TyKind::Typeof(..)
+            | ast::TyKind::Infer
+            | ast::TyKind::ImplicitSelf
+            | ast::TyKind::CVarArgs
+            | ast::TyKind::Pat(..)
+            | ast::TyKind::Dummy
+            | ast::TyKind::Err(..) => break None,
+
+            // These end in brace, but cannot occur in a let-else statement.
+            // They are only parsed as fields of a data structure. For the
+            // purpose of denying trailing braces in the expression of a
+            // let-else, we can disregard these.
+            ast::TyKind::AnonStruct(..) | ast::TyKind::AnonUnion(..) => break None,
+        }
+    }
+}
+
+/// Returns the trailing return type in the given path, if it has one.
+///
+/// ```ignore (illustrative)
+/// ::std::ops::FnOnce(&str) -> fn() -> *const c_void
+///                             ^^^^^^^^^^^^^^^^^^^^^
+/// ```
+fn path_return_type(path: &ast::Path) -> Option<&ast::Ty> {
+    let last_segment = path.segments.last()?;
+    let args = last_segment.args.as_ref()?;
+    match &**args {
+        ast::GenericArgs::Parenthesized(args) => match &args.output {
+            ast::FnRetTy::Default(_) => None,
+            ast::FnRetTy::Ty(ret) => Some(ret),
+        },
+        ast::GenericArgs::AngleBracketed(_) => None,
+    }
+}

compiler/rustc_borrowck/src/type_check/constraint_conversion.rs

@@ -136,7 +136,7 @@ impl<'a, 'tcx> ConstraintConversion<'a, 'tcx> {
 
     fn convert(
         &mut self,
-        predicate: ty::OutlivesPredicate<ty::GenericArg<'tcx>, ty::Region<'tcx>>,
+        predicate: ty::OutlivesPredicate<'tcx, ty::GenericArg<'tcx>>,
         constraint_category: ConstraintCategory<'tcx>,
     ) {
         debug!("generate: constraints at: {:#?}", self.locations);
@@ -276,7 +276,7 @@ impl<'a, 'tcx> ConstraintConversion<'a, 'tcx> {
         &self,
         ty: Ty<'tcx>,
         next_outlives_predicates: &mut Vec<(
-            ty::OutlivesPredicate<ty::GenericArg<'tcx>, ty::Region<'tcx>>,
+            ty::OutlivesPredicate<'tcx, ty::GenericArg<'tcx>>,
             ConstraintCategory<'tcx>,
         )>,
     ) -> Ty<'tcx> {

compiler/rustc_codegen_gcc/src/intrinsic/simd.rs

@@ -14,6 +14,7 @@ use rustc_codegen_ssa::mir::operand::OperandRef;
 use rustc_codegen_ssa::mir::place::PlaceRef;
 use rustc_codegen_ssa::traits::{BaseTypeMethods, BuilderMethods};
 use rustc_hir as hir;
+use rustc_middle::mir::BinOp;
 use rustc_middle::span_bug;
 use rustc_middle::ty::layout::HasTyCtxt;
 use rustc_middle::ty::{self, Ty};
@@ -122,12 +123,12 @@ pub fn generic_simd_intrinsic<'a, 'gcc, 'tcx>(
     let in_ty = arg_tys[0];
 
     let comparison = match name {
-        sym::simd_eq => Some(hir::BinOpKind::Eq),
-        sym::simd_ne => Some(hir::BinOpKind::Ne),
-        sym::simd_lt => Some(hir::BinOpKind::Lt),
-        sym::simd_le => Some(hir::BinOpKind::Le),
-        sym::simd_gt => Some(hir::BinOpKind::Gt),
-        sym::simd_ge => Some(hir::BinOpKind::Ge),
+        sym::simd_eq => Some(BinOp::Eq),
+        sym::simd_ne => Some(BinOp::Ne),
+        sym::simd_lt => Some(BinOp::Lt),
+        sym::simd_le => Some(BinOp::Le),
+        sym::simd_gt => Some(BinOp::Gt),
+        sym::simd_ge => Some(BinOp::Ge),
         _ => None,
     };
 

compiler/rustc_codegen_llvm/src/intrinsic.rs

@@ -14,6 +14,7 @@ use rustc_codegen_ssa::mir::operand::{OperandRef, OperandValue};
 use rustc_codegen_ssa::mir::place::PlaceRef;
 use rustc_codegen_ssa::traits::*;
 use rustc_hir as hir;
+use rustc_middle::mir::BinOp;
 use rustc_middle::ty::layout::{FnAbiOf, HasTyCtxt, LayoutOf};
 use rustc_middle::ty::{self, GenericArgsRef, Ty};
 use rustc_middle::{bug, span_bug};
@@ -1104,12 +1105,12 @@ fn generic_simd_intrinsic<'ll, 'tcx>(
     let in_ty = arg_tys[0];
 
     let comparison = match name {
-        sym::simd_eq => Some(hir::BinOpKind::Eq),
-        sym::simd_ne => Some(hir::BinOpKind::Ne),
-        sym::simd_lt => Some(hir::BinOpKind::Lt),
-        sym::simd_le => Some(hir::BinOpKind::Le),
-        sym::simd_gt => Some(hir::BinOpKind::Gt),
-        sym::simd_ge => Some(hir::BinOpKind::Ge),
+        sym::simd_eq => Some(BinOp::Eq),
+        sym::simd_ne => Some(BinOp::Ne),
+        sym::simd_lt => Some(BinOp::Lt),
+        sym::simd_le => Some(BinOp::Le),
+        sym::simd_gt => Some(BinOp::Gt),
+        sym::simd_ge => Some(BinOp::Ge),
         _ => None,
     };
 

compiler/rustc_codegen_ssa/src/base.rs

@@ -20,7 +20,6 @@ use rustc_data_structures::fx::{FxHashMap, FxIndexSet};
 use rustc_data_structures::profiling::{get_resident_set_size, print_time_passes_entry};
 use rustc_data_structures::sync::par_map;
 use rustc_data_structures::unord::UnordMap;
-use rustc_hir as hir;
 use rustc_hir::def_id::{DefId, LOCAL_CRATE};
 use rustc_hir::lang_items::LangItem;
 use rustc_metadata::EncodedMetadata;
@@ -30,6 +29,7 @@ use rustc_middle::middle::debugger_visualizer::{DebuggerVisualizerFile, Debugger
 use rustc_middle::middle::exported_symbols;
 use rustc_middle::middle::exported_symbols::SymbolExportKind;
 use rustc_middle::middle::lang_items;
+use rustc_middle::mir::BinOp;
 use rustc_middle::mir::mono::{CodegenUnit, CodegenUnitNameBuilder, MonoItem};
 use rustc_middle::query::Providers;
 use rustc_middle::ty::layout::{HasTyCtxt, LayoutOf, TyAndLayout};
@@ -46,32 +46,32 @@ use std::time::{Duration, Instant};
 
 use itertools::Itertools;
 
-pub fn bin_op_to_icmp_predicate(op: hir::BinOpKind, signed: bool) -> IntPredicate {
+pub fn bin_op_to_icmp_predicate(op: BinOp, signed: bool) -> IntPredicate {
     match op {
-        hir::BinOpKind::Eq => IntPredicate::IntEQ,
-        hir::BinOpKind::Ne => IntPredicate::IntNE,
-        hir::BinOpKind::Lt => {
+        BinOp::Eq => IntPredicate::IntEQ,
+        BinOp::Ne => IntPredicate::IntNE,
+        BinOp::Lt => {
             if signed {
                 IntPredicate::IntSLT
             } else {
                 IntPredicate::IntULT
             }
         }
-        hir::BinOpKind::Le => {
+        BinOp::Le => {
             if signed {
                 IntPredicate::IntSLE
             } else {
                 IntPredicate::IntULE
             }
         }
-        hir::BinOpKind::Gt => {
+        BinOp::Gt => {
             if signed {
                 IntPredicate::IntSGT
             } else {
                 IntPredicate::IntUGT
             }
         }
-        hir::BinOpKind::Ge => {
+        BinOp::Ge => {
             if signed {
                 IntPredicate::IntSGE
             } else {
@@ -86,14 +86,14 @@ pub fn bin_op_to_icmp_predicate(op: hir::BinOpKind, signed: bool) -> IntPredicat
     }
 }
 
-pub fn bin_op_to_fcmp_predicate(op: hir::BinOpKind) -> RealPredicate {
+pub fn bin_op_to_fcmp_predicate(op: BinOp) -> RealPredicate {
     match op {
-        hir::BinOpKind::Eq => RealPredicate::RealOEQ,
-        hir::BinOpKind::Ne => RealPredicate::RealUNE,
-        hir::BinOpKind::Lt => RealPredicate::RealOLT,
-        hir::BinOpKind::Le => RealPredicate::RealOLE,
-        hir::BinOpKind::Gt => RealPredicate::RealOGT,
-        hir::BinOpKind::Ge => RealPredicate::RealOGE,
+        BinOp::Eq => RealPredicate::RealOEQ,
+        BinOp::Ne => RealPredicate::RealUNE,
+        BinOp::Lt => RealPredicate::RealOLT,
+        BinOp::Le => RealPredicate::RealOLE,
+        BinOp::Gt => RealPredicate::RealOGT,
+        BinOp::Ge => RealPredicate::RealOGE,
         op => {
             bug!(
                 "comparison_op_to_fcmp_predicate: expected comparison operator, \
@@ -110,7 +110,7 @@ pub fn compare_simd_types<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
     rhs: Bx::Value,
     t: Ty<'tcx>,
     ret_ty: Bx::Type,
-    op: hir::BinOpKind,
+    op: BinOp,
 ) -> Bx::Value {
     let signed = match t.kind() {
         ty::Float(_) => {

compiler/rustc_codegen_ssa/src/lib.rs

@@ -195,6 +195,7 @@ pub enum CodegenErrors {
     EmptyVersionNumber,
     EncodingVersionMismatch { version_array: String, rlink_version: u32 },
     RustcVersionMismatch { rustc_version: String },
+    CorruptFile,
 }
 
 pub fn provide(providers: &mut Providers) {
@@ -265,7 +266,9 @@ impl CodegenResults {
             });
         }
 
-        let mut decoder = MemDecoder::new(&data[4..], 0);
+        let Ok(mut decoder) = MemDecoder::new(&data[4..], 0) else {
+            return Err(CodegenErrors::CorruptFile);
+        };
         let rustc_version = decoder.read_str();
         if rustc_version != sess.cfg_version {
             return Err(CodegenErrors::RustcVersionMismatch {

compiler/rustc_codegen_ssa/src/mir/rvalue.rs

@@ -7,7 +7,6 @@ use crate::common::IntPredicate;
 use crate::traits::*;
 use crate::MemFlags;
 
-use rustc_hir as hir;
 use rustc_middle::mir;
 use rustc_middle::ty::cast::{CastTy, IntTy};
 use rustc_middle::ty::layout::{HasTyCtxt, LayoutOf, TyAndLayout};
@@ -896,9 +895,9 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
             | mir::BinOp::Le
             | mir::BinOp::Ge => {
                 if is_float {
-                    bx.fcmp(base::bin_op_to_fcmp_predicate(op.to_hir_binop()), lhs, rhs)
+                    bx.fcmp(base::bin_op_to_fcmp_predicate(op), lhs, rhs)
                 } else {
-                    bx.icmp(base::bin_op_to_icmp_predicate(op.to_hir_binop(), is_signed), lhs, rhs)
+                    bx.icmp(base::bin_op_to_icmp_predicate(op, is_signed), lhs, rhs)
                 }
             }
             mir::BinOp::Cmp => {
@@ -912,16 +911,16 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
                     // `PartialOrd`, so only use it in debug for now. Once LLVM can handle it
                     // better (see <https://github.com/llvm/llvm-project/issues/73417>), it'll
                     // be worth trying it in optimized builds as well.
-                    let is_gt = bx.icmp(pred(hir::BinOpKind::Gt), lhs, rhs);
+                    let is_gt = bx.icmp(pred(mir::BinOp::Gt), lhs, rhs);
                     let gtext = bx.zext(is_gt, bx.type_i8());
-                    let is_lt = bx.icmp(pred(hir::BinOpKind::Lt), lhs, rhs);
+                    let is_lt = bx.icmp(pred(mir::BinOp::Lt), lhs, rhs);
                     let ltext = bx.zext(is_lt, bx.type_i8());
                     bx.unchecked_ssub(gtext, ltext)
                 } else {
                     // These operations are those expected by `tests/codegen/integer-cmp.rs`,
                     // from <https://github.com/rust-lang/rust/pull/63767>.
-                    let is_lt = bx.icmp(pred(hir::BinOpKind::Lt), lhs, rhs);
-                    let is_ne = bx.icmp(pred(hir::BinOpKind::Ne), lhs, rhs);
+                    let is_lt = bx.icmp(pred(mir::BinOp::Lt), lhs, rhs);
+                    let is_ne = bx.icmp(pred(mir::BinOp::Ne), lhs, rhs);
                     let ge = bx.select(
                         is_ne,
                         bx.cx().const_i8(Ordering::Greater as i8),

compiler/rustc_const_eval/src/const_eval/machine.rs

@@ -25,9 +25,9 @@ use rustc_target::spec::abi::Abi as CallAbi;
 use crate::errors::{LongRunning, LongRunningWarn};
 use crate::fluent_generated as fluent;
 use crate::interpret::{
-    self, compile_time_machine, err_ub, throw_exhaust, throw_inval, throw_ub_custom,
+    self, compile_time_machine, err_ub, throw_exhaust, throw_inval, throw_ub_custom, throw_unsup,
     throw_unsup_format, AllocId, AllocRange, ConstAllocation, CtfeProvenance, FnArg, FnVal, Frame,
-    ImmTy, InterpCx, InterpResult, MPlaceTy, OpTy, Pointer, PointerArithmetic, Scalar,
+    GlobalAlloc, ImmTy, InterpCx, InterpResult, MPlaceTy, OpTy, Pointer, PointerArithmetic, Scalar,
 };
 
 use super::error::*;
@@ -759,11 +759,21 @@ impl<'mir, 'tcx> interpret::Machine<'mir, 'tcx> for CompileTimeInterpreter<'mir,
         ecx: &InterpCx<'mir, 'tcx, Self>,
         alloc_id: AllocId,
     ) -> InterpResult<'tcx> {
+        // Check if this is the currently evaluated static.
         if Some(alloc_id) == ecx.machine.static_root_ids.map(|(id, _)| id) {
-            Err(ConstEvalErrKind::RecursiveStatic.into())
-        } else {
-            Ok(())
+            return Err(ConstEvalErrKind::RecursiveStatic.into());
         }
+        // If this is another static, make sure we fire off the query to detect cycles.
+        // But only do that when checks for static recursion are enabled.
+        if ecx.machine.static_root_ids.is_some() {
+            if let Some(GlobalAlloc::Static(def_id)) = ecx.tcx.try_get_global_alloc(alloc_id) {
+                if ecx.tcx.is_foreign_item(def_id) {
+                    throw_unsup!(ExternStatic(def_id));
+                }
+                ecx.ctfe_query(|tcx| tcx.eval_static_initializer(def_id))?;
+            }
+        }
+        Ok(())
     }
 }
 

compiler/rustc_const_eval/src/interpret/intrinsics.rs

@@ -255,6 +255,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                                     name = intrinsic_name,
                                 );
                             }
+                            // This will always return 0.
                             (a, b)
                         }
                         (Err(_), _) | (_, Err(_)) => {