rust-lang · bors · Jun 28, 2020 · Jun 11, 2020 · Jun 11, 2020 · Jun 11, 2020
diff --git a/src/doc/unstable-book/src/compiler-flags/self-profile.md b/src/doc/unstable-book/src/compiler-flags/self-profile.md
@@ -13,7 +13,7 @@ For example:
 First, run a compilation session and provide the `-Zself-profile` flag:
 
 ```console
-$ rustc --crate-name foo -Zself-profile`
+$ rustc --crate-name foo -Zself-profile
 ```
 
 This will generate three files in the working directory such as:

diff --git a/src/libcore/future/future.rs b/src/libcore/future/future.rs
@@ -27,6 +27,7 @@ use crate::task::{Context, Poll};
 #[must_use = "futures do nothing unless you `.await` or poll them"]
 #[stable(feature = "futures_api", since = "1.36.0")]
 #[lang = "future_trait"]
+#[rustc_on_unimplemented(label = "`{Self}` is not a future", message = "`{Self}` is not a future")]
 pub trait Future {
     /// The type of value produced on completion.
     #[stable(feature = "futures_api", since = "1.36.0")]

diff --git a/src/libprofiler_builtins/build.rs b/src/libprofiler_builtins/build.rs
@@ -24,6 +24,12 @@ fn main() {
         "InstrProfilingUtil.c",
         "InstrProfilingValue.c",
         "InstrProfilingWriter.c",
+        // This file was renamed in LLVM 10.
+        "InstrProfilingRuntime.cc",
+        "InstrProfilingRuntime.cpp",
+        // These files were added in LLVM 11.
+        "InstrProfilingInternal.c",
+        "InstrProfilingBiasVar.c",
     ];
 
     if target.contains("msvc") {
@@ -69,14 +75,12 @@ fn main() {
 
     let src_root = root.join("lib").join("profile");
     for src in profile_sources {
-        cfg.file(src_root.join(src));
+        let path = src_root.join(src);
+        if path.exists() {
+            cfg.file(path);
+        }
     }
 
-    // The file was renamed in LLVM 10.
-    let old_runtime_path = src_root.join("InstrProfilingRuntime.cc");
-    let new_runtime_path = src_root.join("InstrProfilingRuntime.cpp");
-    cfg.file(if old_runtime_path.exists() { old_runtime_path } else { new_runtime_path });
-
     cfg.include(root.join("include"));
     cfg.warnings(false);
     cfg.compile("profiler-rt");

diff --git a/src/librustc_ast_lowering/expr.rs b/src/librustc_ast_lowering/expr.rs
@@ -9,7 +9,7 @@ use rustc_data_structures::thin_vec::ThinVec;
 use rustc_errors::struct_span_err;
 use rustc_hir as hir;
 use rustc_hir::def::Res;
-use rustc_span::source_map::{respan, DesugaringKind, Span, Spanned};
+use rustc_span::source_map::{respan, DesugaringKind, ForLoopLoc, Span, Spanned};
 use rustc_span::symbol::{sym, Ident, Symbol};
 use rustc_target::asm;
 use std::collections::hash_map::Entry;
@@ -1361,9 +1361,14 @@ impl<'hir> LoweringContext<'_, 'hir> {
         body: &Block,
         opt_label: Option<Label>,
     ) -> hir::Expr<'hir> {
+        let orig_head_span = head.span;
         // expand <head>
         let mut head = self.lower_expr_mut(head);
-        let desugared_span = self.mark_span_with_reason(DesugaringKind::ForLoop, head.span, None);
+        let desugared_span = self.mark_span_with_reason(
+            DesugaringKind::ForLoop(ForLoopLoc::Head),
+            orig_head_span,
+            None,
+        );
         head.span = desugared_span;
 
         let iter = Ident::with_dummy_span(sym::iter);
@@ -1458,10 +1463,16 @@ impl<'hir> LoweringContext<'_, 'hir> {
         // `mut iter => { ... }`
         let iter_arm = self.arm(iter_pat, loop_expr);
 
+        let into_iter_span = self.mark_span_with_reason(
+            DesugaringKind::ForLoop(ForLoopLoc::IntoIter),
+            orig_head_span,
+            None,
+        );
+
         // `match ::std::iter::IntoIterator::into_iter(<head>) { ... }`
         let into_iter_expr = {
             let into_iter_path = &[sym::iter, sym::IntoIterator, sym::into_iter];
-            self.expr_call_std_path(desugared_span, into_iter_path, arena_vec![self; head])
+            self.expr_call_std_path(into_iter_span, into_iter_path, arena_vec![self; head])
         };
 
         let match_expr = self.arena.alloc(self.expr_match(

diff --git a/src/librustc_codegen_llvm/back/lto.rs b/src/librustc_codegen_llvm/back/lto.rs
@@ -797,6 +797,7 @@ pub unsafe fn optimize_thin_module(
         kind: ModuleKind::Regular,
     };
     {
+        let target = &*module.module_llvm.tm;
         let llmod = module.module_llvm.llmod();
         save_temp_bitcode(&cgcx, &module, "thin-lto-input");
 
@@ -833,7 +834,7 @@ pub unsafe fn optimize_thin_module(
         {
             let _timer =
                 cgcx.prof.generic_activity_with_arg("LLVM_thin_lto_rename", thin_module.name());
-            if !llvm::LLVMRustPrepareThinLTORename(thin_module.shared.data.0, llmod) {
+            if !llvm::LLVMRustPrepareThinLTORename(thin_module.shared.data.0, llmod, target) {
                 let msg = "failed to prepare thin LTO module";
                 return Err(write::llvm_err(&diag_handler, msg));
             }
@@ -865,7 +866,7 @@ pub unsafe fn optimize_thin_module(
         {
             let _timer =
                 cgcx.prof.generic_activity_with_arg("LLVM_thin_lto_import", thin_module.name());
-            if !llvm::LLVMRustPrepareThinLTOImport(thin_module.shared.data.0, llmod) {
+            if !llvm::LLVMRustPrepareThinLTOImport(thin_module.shared.data.0, llmod, target) {
                 let msg = "failed to prepare thin LTO module";
                 return Err(write::llvm_err(&diag_handler, msg));
             }

diff --git a/src/librustc_codegen_llvm/llvm/ffi.rs b/src/librustc_codegen_llvm/llvm/ffi.rs
@@ -233,6 +233,8 @@ pub enum TypeKind {
     Metadata = 14,
     X86_MMX = 15,
     Token = 16,
+    ScalableVector = 17,
+    BFloat = 18,
 }
 
 impl TypeKind {
@@ -255,6 +257,8 @@ impl TypeKind {
             TypeKind::Metadata => rustc_codegen_ssa::common::TypeKind::Metadata,
             TypeKind::X86_MMX => rustc_codegen_ssa::common::TypeKind::X86_MMX,
             TypeKind::Token => rustc_codegen_ssa::common::TypeKind::Token,
+            TypeKind::ScalableVector => rustc_codegen_ssa::common::TypeKind::ScalableVector,
+            TypeKind::BFloat => rustc_codegen_ssa::common::TypeKind::BFloat,
         }
     }
 }
@@ -2141,10 +2145,18 @@ extern "C" {
         PreservedSymbols: *const *const c_char,
         PreservedSymbolsLen: c_uint,
     ) -> Option<&'static mut ThinLTOData>;
-    pub fn LLVMRustPrepareThinLTORename(Data: &ThinLTOData, Module: &Module) -> bool;
+    pub fn LLVMRustPrepareThinLTORename(
+        Data: &ThinLTOData,
+        Module: &Module,
+        Target: &TargetMachine,
+    ) -> bool;
     pub fn LLVMRustPrepareThinLTOResolveWeak(Data: &ThinLTOData, Module: &Module) -> bool;
     pub fn LLVMRustPrepareThinLTOInternalize(Data: &ThinLTOData, Module: &Module) -> bool;
-    pub fn LLVMRustPrepareThinLTOImport(Data: &ThinLTOData, Module: &Module) -> bool;
+    pub fn LLVMRustPrepareThinLTOImport(
+        Data: &ThinLTOData,
+        Module: &Module,
+        Target: &TargetMachine,
+    ) -> bool;
     pub fn LLVMRustGetThinLTOModuleImports(
         Data: *const ThinLTOData,
         ModuleNameCallback: ThinLTOModuleNameCallback,

diff --git a/src/librustc_codegen_ssa/common.rs b/src/librustc_codegen_ssa/common.rs
@@ -98,6 +98,8 @@ pub enum TypeKind {
     Metadata,
     X86_MMX,
     Token,
+    ScalableVector,
+    BFloat,
 }
 
 // FIXME(mw): Anything that is produced via DepGraph::with_task() must implement

diff --git a/src/librustc_errors/json.rs b/src/librustc_errors/json.rs
@@ -36,6 +36,7 @@ pub struct JsonEmitter {
     pretty: bool,
     ui_testing: bool,
     json_rendered: HumanReadableErrorType,
+    terminal_width: Option<usize>,
     macro_backtrace: bool,
 }
 
@@ -45,6 +46,7 @@ impl JsonEmitter {
         source_map: Lrc<SourceMap>,
         pretty: bool,
         json_rendered: HumanReadableErrorType,
+        terminal_width: Option<usize>,
         macro_backtrace: bool,
     ) -> JsonEmitter {
         JsonEmitter {
@@ -54,13 +56,15 @@ impl JsonEmitter {
             pretty,
             ui_testing: false,
             json_rendered,
+            terminal_width,
             macro_backtrace,
         }
     }
 
     pub fn basic(
         pretty: bool,
         json_rendered: HumanReadableErrorType,
+        terminal_width: Option<usize>,
         macro_backtrace: bool,
     ) -> JsonEmitter {
         let file_path_mapping = FilePathMapping::empty();
@@ -69,6 +73,7 @@ impl JsonEmitter {
             Lrc::new(SourceMap::new(file_path_mapping)),
             pretty,
             json_rendered,
+            terminal_width,
             macro_backtrace,
         )
     }
@@ -79,6 +84,7 @@ impl JsonEmitter {
         source_map: Lrc<SourceMap>,
         pretty: bool,
         json_rendered: HumanReadableErrorType,
+        terminal_width: Option<usize>,
         macro_backtrace: bool,
     ) -> JsonEmitter {
         JsonEmitter {
@@ -88,6 +94,7 @@ impl JsonEmitter {
             pretty,
             ui_testing: false,
             json_rendered,
+            terminal_width,
             macro_backtrace,
         }
     }
@@ -247,7 +254,13 @@ impl Diagnostic {
         let buf = BufWriter::default();
         let output = buf.clone();
         je.json_rendered
-            .new_emitter(Box::new(buf), Some(je.sm.clone()), false, None, je.macro_backtrace)
+            .new_emitter(
+                Box::new(buf),
+                Some(je.sm.clone()),
+                false,
+                je.terminal_width,
+                je.macro_backtrace,
+            )
             .ui_testing(je.ui_testing)
             .emit_diagnostic(diag);
         let output = Arc::try_unwrap(output.0).unwrap().into_inner().unwrap();

diff --git a/src/librustc_hir/lang_items.rs b/src/librustc_hir/lang_items.rs
@@ -21,11 +21,26 @@ use rustc_span::Span;
 
 use lazy_static::lazy_static;
 
+pub enum LangItemGroup {
+    Op,
+}
+
+const NUM_GROUPS: usize = 1;
+
+macro_rules! expand_group {
+    () => {
+        None
+    };
+    ($group:expr) => {
+        Some($group)
+    };
+}
+
 // The actual lang items defined come at the end of this file in one handy table.
 // So you probably just want to nip down to the end.
 macro_rules! language_item_table {
     (
-        $( $variant:ident, $name:expr, $method:ident, $target:expr; )*
+        $( $variant:ident $($group:expr)?, $name:expr, $method:ident, $target:expr; )*
     ) => {
 
         enum_from_u32! {
@@ -45,6 +60,13 @@ macro_rules! language_item_table {
                     $( $variant => $name, )*
                 }
             }
+
+            pub fn group(self) -> Option<LangItemGroup> {
+                use LangItemGroup::*;
+                match self {
+                    $( $variant => expand_group!($($group)*), )*
+                }
+            }
         }
 
         #[derive(HashStable_Generic)]
@@ -54,6 +76,9 @@ macro_rules! language_item_table {
             pub items: Vec<Option<DefId>>,
             /// Lang items that were not found during collection.
             pub missing: Vec<LangItem>,
+            /// Mapping from `LangItemGroup` discriminants to all
+            /// `DefId`s of lang items in that group.
+            pub groups: [Vec<DefId>; NUM_GROUPS],
         }
 
         impl LanguageItems {
@@ -64,6 +89,7 @@ macro_rules! language_item_table {
                 Self {
                     items: vec![$(init_none($variant)),*],
                     missing: Vec::new(),
+                    groups: [vec![]; NUM_GROUPS],
                 }
             }
 
@@ -79,6 +105,10 @@ macro_rules! language_item_table {
                 self.items[it as usize].ok_or_else(|| format!("requires `{}` lang_item", it.name()))
             }
 
+            pub fn group(&self, group: LangItemGroup) -> &[DefId] {
+                self.groups[group as usize].as_ref()
+            }
+
             $(
                 /// Returns the corresponding `DefId` for the lang item
                 #[doc = $name]
@@ -171,30 +201,30 @@ language_item_table! {
     CoerceUnsizedTraitLangItem,  "coerce_unsized",     coerce_unsized_trait,    Target::Trait;
     DispatchFromDynTraitLangItem,"dispatch_from_dyn",  dispatch_from_dyn_trait, Target::Trait;
 
-    AddTraitLangItem,            "add",                add_trait,               Target::Trait;
-    SubTraitLangItem,            "sub",                sub_trait,               Target::Trait;
-    MulTraitLangItem,            "mul",                mul_trait,               Target::Trait;
-    DivTraitLangItem,            "div",                div_trait,               Target::Trait;
-    RemTraitLangItem,            "rem",                rem_trait,               Target::Trait;
-    NegTraitLangItem,            "neg",                neg_trait,               Target::Trait;
-    NotTraitLangItem,            "not",                not_trait,               Target::Trait;
-    BitXorTraitLangItem,         "bitxor",             bitxor_trait,            Target::Trait;
-    BitAndTraitLangItem,         "bitand",             bitand_trait,            Target::Trait;
-    BitOrTraitLangItem,          "bitor",              bitor_trait,             Target::Trait;
-    ShlTraitLangItem,            "shl",                shl_trait,               Target::Trait;
-    ShrTraitLangItem,            "shr",                shr_trait,               Target::Trait;
-    AddAssignTraitLangItem,      "add_assign",         add_assign_trait,        Target::Trait;
-    SubAssignTraitLangItem,      "sub_assign",         sub_assign_trait,        Target::Trait;
-    MulAssignTraitLangItem,      "mul_assign",         mul_assign_trait,        Target::Trait;
-    DivAssignTraitLangItem,      "div_assign",         div_assign_trait,        Target::Trait;
-    RemAssignTraitLangItem,      "rem_assign",         rem_assign_trait,        Target::Trait;
-    BitXorAssignTraitLangItem,   "bitxor_assign",      bitxor_assign_trait,     Target::Trait;
-    BitAndAssignTraitLangItem,   "bitand_assign",      bitand_assign_trait,     Target::Trait;
-    BitOrAssignTraitLangItem,    "bitor_assign",       bitor_assign_trait,      Target::Trait;
-    ShlAssignTraitLangItem,      "shl_assign",         shl_assign_trait,        Target::Trait;
-    ShrAssignTraitLangItem,      "shr_assign",         shr_assign_trait,        Target::Trait;
-    IndexTraitLangItem,          "index",              index_trait,             Target::Trait;
-    IndexMutTraitLangItem,       "index_mut",          index_mut_trait,         Target::Trait;
+    AddTraitLangItem(Op),        "add",                add_trait,               Target::Trait;
+    SubTraitLangItem(Op),        "sub",                sub_trait,               Target::Trait;
+    MulTraitLangItem(Op),        "mul",                mul_trait,               Target::Trait;
+    DivTraitLangItem(Op),        "div",                div_trait,               Target::Trait;
+    RemTraitLangItem(Op),        "rem",                rem_trait,               Target::Trait;
+    NegTraitLangItem(Op),        "neg",                neg_trait,               Target::Trait;
+    NotTraitLangItem(Op),        "not",                not_trait,               Target::Trait;
+    BitXorTraitLangItem(Op),     "bitxor",             bitxor_trait,            Target::Trait;
+    BitAndTraitLangItem(Op),     "bitand",             bitand_trait,            Target::Trait;
+    BitOrTraitLangItem(Op),      "bitor",              bitor_trait,             Target::Trait;
+    ShlTraitLangItem(Op),        "shl",                shl_trait,               Target::Trait;
+    ShrTraitLangItem(Op),        "shr",                shr_trait,               Target::Trait;
+    AddAssignTraitLangItem(Op),  "add_assign",         add_assign_trait,        Target::Trait;
+    SubAssignTraitLangItem(Op),  "sub_assign",         sub_assign_trait,        Target::Trait;
+    MulAssignTraitLangItem(Op),  "mul_assign",         mul_assign_trait,        Target::Trait;
+    DivAssignTraitLangItem(Op),  "div_assign",         div_assign_trait,        Target::Trait;
+    RemAssignTraitLangItem(Op),  "rem_assign",         rem_assign_trait,        Target::Trait;
+    BitXorAssignTraitLangItem(Op),"bitxor_assign",     bitxor_assign_trait,     Target::Trait;
+    BitAndAssignTraitLangItem(Op),"bitand_assign",     bitand_assign_trait,     Target::Trait;
+    BitOrAssignTraitLangItem(Op),"bitor_assign",       bitor_assign_trait,      Target::Trait;
+    ShlAssignTraitLangItem(Op),  "shl_assign",         shl_assign_trait,        Target::Trait;
+    ShrAssignTraitLangItem(Op),  "shr_assign",         shr_assign_trait,        Target::Trait;
+    IndexTraitLangItem(Op),      "index",              index_trait,             Target::Trait;
+    IndexMutTraitLangItem(Op),   "index_mut",          index_mut_trait,         Target::Trait;
 
     UnsafeCellTypeLangItem,      "unsafe_cell",        unsafe_cell_type,        Target::Struct;
     VaListTypeLangItem,          "va_list",            va_list,                 Target::Struct;

diff --git a/src/librustc_infer/infer/error_reporting/need_type_info.rs b/src/librustc_infer/infer/error_reporting/need_type_info.rs
@@ -468,7 +468,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
             let msg = if let Some(simple_ident) = pattern.simple_ident() {
                 match pattern.span.desugaring_kind() {
                     None => format!("consider giving `{}` {}", simple_ident, suffix),
-                    Some(DesugaringKind::ForLoop) => {
+                    Some(DesugaringKind::ForLoop(_)) => {
                         "the element type for this iterator is not specified".to_string()
                     }
                     _ => format!("this needs {}", suffix),