Rollup of 6 pull requests

src/libcore/pin.rs

@@ -672,6 +672,7 @@ impl<'a, T: ?Sized> Pin<&'a T> {
     #[stable(feature = "pin", since = "1.33.0")]
     pub unsafe fn map_unchecked<U, F>(self, func: F) -> Pin<&'a U>
     where
+        U: ?Sized,
         F: FnOnce(&T) -> &U,
     {
         let pointer = &*self.pointer;
@@ -763,6 +764,7 @@ impl<'a, T: ?Sized> Pin<&'a mut T> {
     #[stable(feature = "pin", since = "1.33.0")]
     pub unsafe fn map_unchecked_mut<U, F>(self, func: F) -> Pin<&'a mut U>
     where
+        U: ?Sized,
         F: FnOnce(&mut T) -> &mut U,
     {
         let pointer = Pin::get_unchecked_mut(self);

src/librustc/hir/map/mod.rs

@@ -1270,7 +1270,7 @@ pub fn map_crate<'hir>(
         definitions,
     };
 
-    sess.time("validate HIR map", || {
+    sess.time("validate_HIR_map", || {
         hir_id_validator::check_crate(&map);
     });
 

src/librustc/ty/query/on_disk_cache.rs

@@ -198,7 +198,7 @@ impl<'sess> OnDiskCache<'sess> {
             // Encode query results.
             let mut query_result_index = EncodedQueryResultIndex::new();
 
-            tcx.sess.time("encode query results", || {
+            tcx.sess.time("encode_query_results", || {
                 let enc = &mut encoder;
                 let qri = &mut query_result_index;
 
@@ -1053,8 +1053,8 @@ where
     Q: super::config::QueryDescription<'tcx, Value: Encodable>,
     E: 'a + TyEncoder,
 {
-    let desc = &format!("encode_query_results for {}", ::std::any::type_name::<Q>());
-    let _timer = tcx.sess.prof.generic_pass(desc);
+    let desc = &format!("encode_query_results_for_{}", ::std::any::type_name::<Q>());
+    let _timer = tcx.sess.prof.extra_verbose_generic_activity(desc);
 
     let shards = Q::query_cache(tcx).lock_shards();
     assert!(shards.iter().all(|shard| shard.active.is_empty()));

src/librustc/ty/util.rs

@@ -3,18 +3,18 @@
 use crate::hir::map::DefPathData;
 use crate::ich::NodeIdHashingMode;
 use crate::mir::interpret::{sign_extend, truncate};
-use crate::ty::layout::{Integer, IntegerExt};
+use crate::ty::layout::{Integer, IntegerExt, Size};
 use crate::ty::query::TyCtxtAt;
 use crate::ty::subst::{GenericArgKind, InternalSubsts, Subst, SubstsRef};
 use crate::ty::TyKind::*;
 use crate::ty::{self, DefIdTree, GenericParamDefKind, Ty, TyCtxt, TypeFoldable};
 use crate::util::common::ErrorReported;
+use rustc_apfloat::Float as _;
+use rustc_data_structures::fx::{FxHashMap, FxHashSet};
+use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
 use rustc_hir as hir;
 use rustc_hir::def::DefKind;
 use rustc_hir::def_id::DefId;
-
-use rustc_data_structures::fx::{FxHashMap, FxHashSet};
-use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
 use rustc_macros::HashStable;
 use rustc_span::Span;
 use std::{cmp, fmt};
@@ -43,41 +43,54 @@ impl<'tcx> fmt::Display for Discr<'tcx> {
     }
 }
 
+fn signed_min(size: Size) -> i128 {
+    sign_extend(1_u128 << (size.bits() - 1), size) as i128
+}
+
+fn signed_max(size: Size) -> i128 {
+    i128::max_value() >> (128 - size.bits())
+}
+
+fn unsigned_max(size: Size) -> u128 {
+    u128::max_value() >> (128 - size.bits())
+}
+
+fn int_size_and_signed<'tcx>(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>) -> (Size, bool) {
+    let (int, signed) = match ty.kind {
+        Int(ity) => (Integer::from_attr(&tcx, SignedInt(ity)), true),
+        Uint(uty) => (Integer::from_attr(&tcx, UnsignedInt(uty)), false),
+        _ => bug!("non integer discriminant"),
+    };
+    (int.size(), signed)
+}
+
 impl<'tcx> Discr<'tcx> {
     /// Adds `1` to the value and wraps around if the maximum for the type is reached.
     pub fn wrap_incr(self, tcx: TyCtxt<'tcx>) -> Self {
         self.checked_add(tcx, 1).0
     }
     pub fn checked_add(self, tcx: TyCtxt<'tcx>, n: u128) -> (Self, bool) {
-        let (int, signed) = match self.ty.kind {
-            Int(ity) => (Integer::from_attr(&tcx, SignedInt(ity)), true),
-            Uint(uty) => (Integer::from_attr(&tcx, UnsignedInt(uty)), false),
-            _ => bug!("non integer discriminant"),
-        };
-
-        let size = int.size();
-        let bit_size = int.size().bits();
-        let shift = 128 - bit_size;
-        if signed {
-            let sext = |u| sign_extend(u, size) as i128;
-            let min = sext(1_u128 << (bit_size - 1));
-            let max = i128::max_value() >> shift;
-            let val = sext(self.val);
+        let (size, signed) = int_size_and_signed(tcx, self.ty);
+        let (val, oflo) = if signed {
+            let min = signed_min(size);
+            let max = signed_max(size);
+            let val = sign_extend(self.val, size) as i128;
             assert!(n < (i128::max_value() as u128));
             let n = n as i128;
             let oflo = val > max - n;
             let val = if oflo { min + (n - (max - val) - 1) } else { val + n };
             // zero the upper bits
             let val = val as u128;
             let val = truncate(val, size);
-            (Self { val: val as u128, ty: self.ty }, oflo)
+            (val, oflo)
         } else {
-            let max = u128::max_value() >> shift;
+            let max = unsigned_max(size);
             let val = self.val;
             let oflo = val > max - n;
             let val = if oflo { n - (max - val) - 1 } else { val + n };
-            (Self { val: val, ty: self.ty }, oflo)
-        }
+            (val, oflo)
+        };
+        (Self { val, ty: self.ty }, oflo)
     }
 }
 
@@ -621,6 +634,44 @@ impl<'tcx> TyCtxt<'tcx> {
 }
 
 impl<'tcx> ty::TyS<'tcx> {
+    /// Returns the maximum value for the given numeric type (including `char`s)
+    /// or returns `None` if the type is not numeric.
+    pub fn numeric_max_val(&'tcx self, tcx: TyCtxt<'tcx>) -> Option<&'tcx ty::Const<'tcx>> {
+        let val = match self.kind {
+            ty::Int(_) | ty::Uint(_) => {
+                let (size, signed) = int_size_and_signed(tcx, self);
+                let val = if signed { signed_max(size) as u128 } else { unsigned_max(size) };
+                Some(val)
+            }
+            ty::Char => Some(std::char::MAX as u128),
+            ty::Float(fty) => Some(match fty {
+                ast::FloatTy::F32 => ::rustc_apfloat::ieee::Single::INFINITY.to_bits(),
+                ast::FloatTy::F64 => ::rustc_apfloat::ieee::Double::INFINITY.to_bits(),
+            }),
+            _ => None,
+        };
+        val.map(|v| ty::Const::from_bits(tcx, v, ty::ParamEnv::empty().and(self)))
+    }
+
+    /// Returns the minimum value for the given numeric type (including `char`s)
+    /// or returns `None` if the type is not numeric.
+    pub fn numeric_min_val(&'tcx self, tcx: TyCtxt<'tcx>) -> Option<&'tcx ty::Const<'tcx>> {
+        let val = match self.kind {
+            ty::Int(_) | ty::Uint(_) => {
+                let (size, signed) = int_size_and_signed(tcx, self);
+                let val = if signed { truncate(signed_min(size) as u128, size) } else { 0 };
+                Some(val)
+            }
+            ty::Char => Some(0),
+            ty::Float(fty) => Some(match fty {
+                ast::FloatTy::F32 => (-::rustc_apfloat::ieee::Single::INFINITY).to_bits(),
+                ast::FloatTy::F64 => (-::rustc_apfloat::ieee::Double::INFINITY).to_bits(),
+            }),
+            _ => None,
+        };
+        val.map(|v| ty::Const::from_bits(tcx, v, ty::ParamEnv::empty().and(self)))
+    }
+
     /// Checks whether values of this type `T` are *moved* or *copied*
     /// when referenced -- this amounts to a check for whether `T:
     /// Copy`, but note that we **don't** consider lifetimes when

src/librustc_ast_lowering/lib.rs

@@ -2706,9 +2706,9 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
             PatKind::Box(ref inner) => hir::PatKind::Box(self.lower_pat(inner)),
             PatKind::Ref(ref inner, mutbl) => hir::PatKind::Ref(self.lower_pat(inner), mutbl),
             PatKind::Range(ref e1, ref e2, Spanned { node: ref end, .. }) => hir::PatKind::Range(
-                self.lower_expr(e1),
-                self.lower_expr(e2),
-                self.lower_range_end(end),
+                e1.as_deref().map(|e| self.lower_expr(e)),
+                e2.as_deref().map(|e| self.lower_expr(e)),
+                self.lower_range_end(end, e2.is_some()),
             ),
             PatKind::Slice(ref pats) => self.lower_pat_slice(pats),
             PatKind::Rest => {
@@ -2885,10 +2885,11 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
         hir::PatKind::Wild
     }
 
-    fn lower_range_end(&mut self, e: &RangeEnd) -> hir::RangeEnd {
+    fn lower_range_end(&mut self, e: &RangeEnd, has_end: bool) -> hir::RangeEnd {
         match *e {
-            RangeEnd::Included(_) => hir::RangeEnd::Included,
-            RangeEnd::Excluded => hir::RangeEnd::Excluded,
+            RangeEnd::Excluded if has_end => hir::RangeEnd::Excluded,
+            // No end; so `X..` behaves like `RangeFrom`.
+            RangeEnd::Excluded | RangeEnd::Included(_) => hir::RangeEnd::Included,
         }
     }
 

src/librustc_codegen_llvm/back/lto.rs

@@ -120,12 +120,13 @@ fn prepare_lto(
                 info!("adding bytecode {}", name);
                 let bc_encoded = data.data();
 
-                let (bc, id) = cgcx.prof.generic_pass(&format!("decode {}", name)).run(|| {
-                    match DecodedBytecode::new(bc_encoded) {
+                let (bc, id) = cgcx
+                    .prof
+                    .extra_verbose_generic_activity(&format!("decode {}", name))
+                    .run(|| match DecodedBytecode::new(bc_encoded) {
                         Ok(b) => Ok((b.bytecode(), b.identifier().to_string())),
                         Err(e) => Err(diag_handler.fatal(&e)),
-                    }
-                })?;
+                    })?;
                 let bc = SerializedModule::FromRlib(bc);
                 upstream_modules.push((bc, CString::new(id).unwrap()));
             }
@@ -280,8 +281,9 @@ fn fat_lto(
         // save and persist everything with the original module.
         let mut linker = Linker::new(llmod);
         for (bc_decoded, name) in serialized_modules {
+            let _timer = cgcx.prof.generic_activity("LLVM_fat_lto_link_module");
             info!("linking {:?}", name);
-            cgcx.prof.generic_pass(&format!("ll link {:?}", name)).run(|| {
+            cgcx.prof.extra_verbose_generic_activity(&format!("ll link {:?}", name)).run(|| {
                 let data = bc_decoded.data();
                 linker.add(&data).map_err(|()| {
                     let msg = format!("failed to load bc of {:?}", name);
@@ -633,7 +635,7 @@ pub(crate) fn run_pass_manager(
         }
 
         cgcx.prof
-            .generic_pass("LTO passes")
+            .extra_verbose_generic_activity("LTO_passes")
             .run(|| llvm::LLVMRunPassManager(pm, module.module_llvm.llmod()));
 
         llvm::LLVMDisposePassManager(pm);

src/librustc_codegen_llvm/back/write.rs

@@ -424,13 +424,23 @@ pub(crate) unsafe fn optimize(
 
         // Finally, run the actual optimization passes
         {
+            let _timer = cgcx.prof.generic_activity("LLVM_module_optimize_function_passes");
             let desc = &format!("llvm function passes [{}]", module_name.unwrap());
-            let _timer = if config.time_module { Some(cgcx.prof.generic_pass(desc)) } else { None };
+            let _timer = if config.time_module {
+                Some(cgcx.prof.extra_verbose_generic_activity(desc))
+            } else {
+                None
+            };
             llvm::LLVMRustRunFunctionPassManager(fpm, llmod);
         }
         {
+            let _timer = cgcx.prof.generic_activity("LLVM_module_optimize_module_passes");
             let desc = &format!("llvm module passes [{}]", module_name.unwrap());
-            let _timer = if config.time_module { Some(cgcx.prof.generic_pass(desc)) } else { None };
+            let _timer = if config.time_module {
+                Some(cgcx.prof.extra_verbose_generic_activity(desc))
+            } else {
+                None
+            };
             llvm::LLVMRunPassManager(mpm, llmod);
         }
 
@@ -556,7 +566,11 @@ pub(crate) unsafe fn codegen(
 
         {
             let desc = &format!("codegen passes [{}]", module_name.unwrap());
-            let _timer = if config.time_module { Some(cgcx.prof.generic_pass(desc)) } else { None };
+            let _timer = if config.time_module {
+                Some(cgcx.prof.extra_verbose_generic_activity(desc))
+            } else {
+                None
+            };
 
             if config.emit_ir {
                 let _timer = cgcx.prof.generic_activity("LLVM_module_codegen_emit_ir");

src/librustc_codegen_llvm/lib.rs

@@ -283,7 +283,7 @@ impl CodegenBackend for LlvmCodegenBackend {
             rustc_codegen_ssa::back::write::dump_incremental_data(&codegen_results);
         }
 
-        sess.time("serialize work products", move || {
+        sess.time("serialize_work_products", move || {
             rustc_incremental::save_work_product_index(sess, &dep_graph, work_products)
         });
 
@@ -300,7 +300,7 @@ impl CodegenBackend for LlvmCodegenBackend {
 
         // Run the linker on any artifacts that resulted from the LLVM run.
         // This should produce either a finished executable or library.
-        sess.time("linking", || {
+        sess.time("link_crate", || {
             use crate::back::archive::LlvmArchiveBuilder;
             use rustc_codegen_ssa::back::link::link_binary;
 

src/librustc_codegen_ssa/back/link.rs

@@ -577,7 +577,7 @@ fn link_natively<'a, B: ArchiveBuilder<'a>>(
     let mut i = 0;
     loop {
         i += 1;
-        prog = sess.time("running linker", || exec_linker(sess, &mut cmd, out_filename, tmpdir));
+        prog = sess.time("run_linker", || exec_linker(sess, &mut cmd, out_filename, tmpdir));
         let output = match prog {
             Ok(ref output) => output,
             Err(_) => break,
@@ -1562,7 +1562,7 @@ fn add_upstream_rust_crates<'a, B: ArchiveBuilder<'a>>(
         let name = cratepath.file_name().unwrap().to_str().unwrap();
         let name = &name[3..name.len() - 5]; // chop off lib/.rlib
 
-        sess.prof.generic_pass(&format!("altering {}.rlib", name)).run(|| {
+        sess.prof.extra_verbose_generic_activity(&format!("altering {}.rlib", name)).run(|| {
             let mut archive = <B as ArchiveBuilder>::new(sess, &dst, Some(cratepath));
             archive.update_symbols();
 

src/librustc_codegen_ssa/back/symbol_export.rs

@@ -345,7 +345,7 @@ fn symbol_export_level(tcx: TyCtxt<'_>, sym_def_id: DefId) -> SymbolExportLevel
     if is_extern && !std_internal {
         let target = &tcx.sess.target.target.llvm_target;
         // WebAssembly cannot export data symbols, so reduce their export level
-        if target.contains("wasm32") || target.contains("emscripten") {
+        if target.contains("emscripten") {
             if let Some(Node::Item(&hir::Item { kind: hir::ItemKind::Static(..), .. })) =
                 tcx.hir().get_if_local(sym_def_id)
             {

src/librustc_codegen_ssa/back/write.rs

@@ -1511,7 +1511,7 @@ fn start_executing_work<B: ExtraBackendMethods>(
         llvm_start_time: &mut Option<VerboseTimingGuard<'a>>,
     ) {
         if config.time_module && llvm_start_time.is_none() {
-            *llvm_start_time = Some(prof.generic_pass("LLVM passes"));
+            *llvm_start_time = Some(prof.extra_verbose_generic_activity("LLVM_passes"));
         }
     }
 }

src/librustc_codegen_ssa/base.rs

@@ -566,7 +566,7 @@ pub fn codegen_crate<B: ExtraBackendMethods>(
             cgu_name_builder.build_cgu_name(LOCAL_CRATE, &["crate"], Some("allocator")).to_string();
         let mut modules = backend.new_metadata(tcx, &llmod_id);
         tcx.sess
-            .time("write allocator module", || backend.codegen_allocator(tcx, &mut modules, kind));
+            .time("write_allocator_module", || backend.codegen_allocator(tcx, &mut modules, kind));
 
         Some(ModuleCodegen { name: llmod_id, module_llvm: modules, kind: ModuleKind::Allocator })
     } else {
@@ -582,7 +582,7 @@ pub fn codegen_crate<B: ExtraBackendMethods>(
         let metadata_cgu_name =
             cgu_name_builder.build_cgu_name(LOCAL_CRATE, &["crate"], Some("metadata")).to_string();
         let mut metadata_llvm_module = backend.new_metadata(tcx, &metadata_cgu_name);
-        tcx.sess.time("write compressed metadata", || {
+        tcx.sess.time("write_compressed_metadata", || {
             backend.write_compressed_metadata(
                 tcx,
                 &ongoing_codegen.metadata,
@@ -652,7 +652,7 @@ pub fn codegen_crate<B: ExtraBackendMethods>(
 
     // Since the main thread is sometimes blocked during codegen, we keep track
     // -Ztime-passes output manually.
-    print_time_passes_entry(tcx.sess.time_passes(), "codegen to LLVM IR", total_codegen_time);
+    print_time_passes_entry(tcx.sess.time_passes(), "codegen_to_LLVM_IR", total_codegen_time);
 
     ::rustc_incremental::assert_module_sources::assert_module_sources(tcx);
 
@@ -712,9 +712,9 @@ impl<B: ExtraBackendMethods> Drop for AbortCodegenOnDrop<B> {
 }
 
 fn assert_and_save_dep_graph(tcx: TyCtxt<'_>) {
-    tcx.sess.time("assert dep graph", || ::rustc_incremental::assert_dep_graph(tcx));
+    tcx.sess.time("assert_dep_graph", || ::rustc_incremental::assert_dep_graph(tcx));
 
-    tcx.sess.time("serialize dep graph", || ::rustc_incremental::save_dep_graph(tcx));
+    tcx.sess.time("serialize_dep_graph", || ::rustc_incremental::save_dep_graph(tcx));
 }
 
 impl CrateInfo {