Fix clippy lints

compiler/rustc_borrowck/src/lib.rs

@@ -277,26 +277,26 @@ fn do_mir_borrowck<'a, 'tcx>(
 
     let regioncx = Rc::new(regioncx);
 
-    let flow_borrows = Borrows::new(tcx, &body, &regioncx, &borrow_set)
-        .into_engine(tcx, &body)
+    let flow_borrows = Borrows::new(tcx, body, &regioncx, &borrow_set)
+        .into_engine(tcx, body)
         .pass_name("borrowck")
         .iterate_to_fixpoint();
-    let flow_uninits = MaybeUninitializedPlaces::new(tcx, &body, &mdpe)
-        .into_engine(tcx, &body)
+    let flow_uninits = MaybeUninitializedPlaces::new(tcx, body, &mdpe)
+        .into_engine(tcx, body)
         .pass_name("borrowck")
         .iterate_to_fixpoint();
-    let flow_ever_inits = EverInitializedPlaces::new(tcx, &body, &mdpe)
-        .into_engine(tcx, &body)
+    let flow_ever_inits = EverInitializedPlaces::new(tcx, body, &mdpe)
+        .into_engine(tcx, body)
         .pass_name("borrowck")
         .iterate_to_fixpoint();
 
-    let movable_generator = match tcx.hir().get(id) {
+    let movable_generator = !matches!(
+        tcx.hir().get(id),
         Node::Expr(&hir::Expr {
             kind: hir::ExprKind::Closure(.., Some(hir::Movability::Static)),
             ..
-        }) => false,
-        _ => true,
-    };
+        })
+    );
 
     for (idx, move_data_results) in promoted_errors {
         let promoted_body = &promoted[idx];
@@ -374,8 +374,8 @@ fn do_mir_borrowck<'a, 'tcx>(
     mbcx.report_move_errors(move_errors);
 
     rustc_mir_dataflow::visit_results(
-        &body,
-        traversal::reverse_postorder(&body).map(|(bb, _)| bb),
+        body,
+        traversal::reverse_postorder(body).map(|(bb, _)| bb),
         &results,
         &mut mbcx,
     );

compiler/rustc_codegen_llvm/src/abi.rs

@@ -526,7 +526,7 @@ impl<'tcx> FnAbiLlvmExt<'tcx> for FnAbi<'tcx, Ty<'tcx>> {
         };
         match self.ret.mode {
             PassMode::Direct(ref attrs) => {
-                attrs.apply_attrs_to_callsite(llvm::AttributePlace::ReturnValue, &bx.cx, callsite);
+                attrs.apply_attrs_to_callsite(llvm::AttributePlace::ReturnValue, bx.cx, callsite);
             }
             PassMode::Indirect { ref attrs, extra_attrs: _, on_stack } => {
                 assert!(!on_stack);

compiler/rustc_codegen_llvm/src/asm.rs

@@ -105,7 +105,7 @@ impl AsmBuilderMethods<'tcx> for Builder<'a, 'll, 'tcx> {
         let r = r.unwrap();
 
         // Again, based on how many outputs we have
-        let outputs = ia.outputs.iter().zip(&outputs).filter(|&(ref o, _)| !o.is_indirect);
+        let outputs = ia.outputs.iter().zip(&outputs).filter(|&(o, _)| !o.is_indirect);
         for (i, (_, &place)) in outputs.enumerate() {
             let v = if num_outputs == 1 { r } else { self.extract_value(r, i as u64) };
             OperandValue::Immediate(v).store(self, place);
@@ -331,7 +331,7 @@ impl AsmBuilderMethods<'tcx> for Builder<'a, 'll, 'tcx> {
         let output_type = match &output_types[..] {
             [] => self.type_void(),
             [ty] => ty,
-            tys => self.type_struct(&tys, false),
+            tys => self.type_struct(tys, false),
         };
         let dialect = match asm_arch {
             InlineAsmArch::X86 | InlineAsmArch::X86_64

compiler/rustc_codegen_llvm/src/back/lto.rs

@@ -109,7 +109,7 @@ fn prepare_lto(
                     .extend(exported_symbols[&cnum].iter().filter_map(symbol_filter));
             }
 
-            let archive = ArchiveRO::open(&path).expect("wanted an rlib");
+            let archive = ArchiveRO::open(path).expect("wanted an rlib");
             let obj_files = archive
                 .iter()
                 .filter_map(|child| child.ok().and_then(|c| c.name().map(|name| (name, c))))
@@ -316,14 +316,14 @@ fn fat_lto(
                 .generic_activity_with_arg("LLVM_fat_lto_link_module", format!("{:?}", name));
             info!("linking {:?}", name);
             let data = bc_decoded.data();
-            linker.add(&data).map_err(|()| {
+            linker.add(data).map_err(|()| {
                 let msg = format!("failed to load bc of {:?}", name);
-                write::llvm_err(&diag_handler, &msg)
+                write::llvm_err(diag_handler, &msg)
             })?;
             serialized_bitcode.push(bc_decoded);
         }
         drop(linker);
-        save_temp_bitcode(&cgcx, &module, "lto.input");
+        save_temp_bitcode(cgcx, &module, "lto.input");
 
         // Fat LTO also suffers from the invalid DWARF issue similar to Thin LTO.
         // Here we rewrite all `DICompileUnit` pointers if there is only one `DICompileUnit`.
@@ -347,14 +347,14 @@ fn fat_lto(
                 ptr as *const *const libc::c_char,
                 symbols_below_threshold.len() as libc::size_t,
             );
-            save_temp_bitcode(&cgcx, &module, "lto.after-restriction");
+            save_temp_bitcode(cgcx, &module, "lto.after-restriction");
         }
 
         if cgcx.no_landing_pads {
             unsafe {
                 llvm::LLVMRustMarkAllFunctionsNounwind(llmod);
             }
-            save_temp_bitcode(&cgcx, &module, "lto.after-nounwind");
+            save_temp_bitcode(cgcx, &module, "lto.after-nounwind");
         }
     }
 
@@ -498,7 +498,7 @@ fn thin_lto(
             symbols_below_threshold.as_ptr(),
             symbols_below_threshold.len() as u32,
         )
-        .ok_or_else(|| write::llvm_err(&diag_handler, "failed to prepare thin LTO context"))?;
+        .ok_or_else(|| write::llvm_err(diag_handler, "failed to prepare thin LTO context"))?;
 
         let data = ThinData(data);
 
@@ -572,7 +572,7 @@ fn thin_lto(
         if let Some(path) = key_map_path {
             if let Err(err) = curr_key_map.save_to_file(&path) {
                 let msg = format!("Error while writing ThinLTO key data: {}", err);
-                return Err(write::llvm_err(&diag_handler, &msg));
+                return Err(write::llvm_err(diag_handler, &msg));
             }
         }
 
@@ -744,8 +744,7 @@ pub unsafe fn optimize_thin_module(
     // crates but for locally codegened modules we may be able to reuse
     // that LLVM Context and Module.
     let llcx = llvm::LLVMRustContextCreate(cgcx.fewer_names);
-    let llmod_raw =
-        parse_module(llcx, &module_name, thin_module.data(), &diag_handler)? as *const _;
+    let llmod_raw = parse_module(llcx, module_name, thin_module.data(), &diag_handler)? as *const _;
     let module = ModuleCodegen {
         module_llvm: ModuleLlvm { llmod_raw, llcx, tm },
         name: thin_module.name().to_string(),
@@ -754,7 +753,7 @@ pub unsafe fn optimize_thin_module(
     {
         let target = &*module.module_llvm.tm;
         let llmod = module.module_llvm.llmod();
-        save_temp_bitcode(&cgcx, &module, "thin-lto-input");
+        save_temp_bitcode(cgcx, &module, "thin-lto-input");
 
         // Before we do much else find the "main" `DICompileUnit` that we'll be
         // using below. If we find more than one though then rustc has changed
@@ -775,7 +774,7 @@ pub unsafe fn optimize_thin_module(
                 .prof
                 .generic_activity_with_arg("LLVM_thin_lto_remove_landing_pads", thin_module.name());
             llvm::LLVMRustMarkAllFunctionsNounwind(llmod);
-            save_temp_bitcode(&cgcx, &module, "thin-lto-after-nounwind");
+            save_temp_bitcode(cgcx, &module, "thin-lto-after-nounwind");
         }
 
         // Up next comes the per-module local analyses that we do for Thin LTO.
@@ -947,7 +946,7 @@ pub fn parse_module<'a>(
         llvm::LLVMRustParseBitcodeForLTO(cx, data.as_ptr(), data.len(), name.as_ptr()).ok_or_else(
             || {
                 let msg = "failed to parse bitcode for LTO module";
-                write::llvm_err(&diag_handler, msg)
+                write::llvm_err(diag_handler, msg)
             },
         )
     }

compiler/rustc_codegen_llvm/src/back/write.rs

@@ -41,7 +41,7 @@ use std::sync::Arc;
 pub fn llvm_err(handler: &rustc_errors::Handler, msg: &str) -> FatalError {
     match llvm::last_error() {
         Some(err) => handler.fatal(&format!("{}: {}", msg, err)),
-        None => handler.fatal(&msg),
+        None => handler.fatal(msg),
     }
 }
 
@@ -96,7 +96,7 @@ pub fn create_target_machine(tcx: TyCtxt<'_>, mod_name: &str) -> &'static mut ll
         None
     };
     let config = TargetMachineFactoryConfig { split_dwarf_file };
-    target_machine_factory(&tcx.sess, tcx.backend_optimization_level(()))(config)
+    target_machine_factory(tcx.sess, tcx.backend_optimization_level(()))(config)
         .unwrap_or_else(|err| llvm_err(tcx.sess.diagnostic(), &err).raise())
 }
 
@@ -556,7 +556,7 @@ pub(crate) unsafe fn optimize(
                 let prepare_for_thin_lto = cgcx.lto == Lto::Thin
                     || cgcx.lto == Lto::ThinLocal
                     || (cgcx.lto != Lto::Fat && cgcx.opts.cg.linker_plugin_lto.enabled());
-                with_llvm_pmb(llmod, &config, opt_level, prepare_for_thin_lto, &mut |b| {
+                with_llvm_pmb(llmod, config, opt_level, prepare_for_thin_lto, &mut |b| {
                     llvm::LLVMRustAddLastExtensionPasses(
                         b,
                         extra_passes.as_ptr(),
@@ -658,9 +658,9 @@ pub(crate) fn link(
         let _timer =
             cgcx.prof.generic_activity_with_arg("LLVM_link_module", format!("{:?}", module.name));
         let buffer = ModuleBuffer::new(module.module_llvm.llmod());
-        linker.add(&buffer.data()).map_err(|()| {
+        linker.add(buffer.data()).map_err(|()| {
             let msg = format!("failed to serialize module {:?}", module.name);
-            llvm_err(&diag_handler, &msg)
+            llvm_err(diag_handler, &msg)
         })?;
     }
     drop(linker);

compiler/rustc_codegen_llvm/src/builder.rs

@@ -86,7 +86,7 @@ impl ty::layout::HasParamEnv<'tcx> for Builder<'_, '_, 'tcx> {
 impl HasTargetSpec for Builder<'_, '_, 'tcx> {
     #[inline]
     fn target_spec(&self) -> &Target {
-        &self.cx.target_spec()
+        self.cx.target_spec()
     }
 }
 

compiler/rustc_codegen_llvm/src/callee.rs

@@ -44,7 +44,7 @@ pub fn get_fn(cx: &CodegenCx<'ll, 'tcx>, instance: Instance<'tcx>) -> &'ll Value
 
     let fn_abi = cx.fn_abi_of_instance(instance, ty::List::empty());
 
-    let llfn = if let Some(llfn) = cx.get_declared_value(&sym) {
+    let llfn = if let Some(llfn) = cx.get_declared_value(sym) {
         // Create a fn pointer with the new signature.
         let llptrty = fn_abi.ptr_to_llvm_type(cx);
 
@@ -79,7 +79,7 @@ pub fn get_fn(cx: &CodegenCx<'ll, 'tcx>, instance: Instance<'tcx>) -> &'ll Value
             llfn
         }
     } else {
-        let llfn = cx.declare_fn(&sym, &fn_abi);
+        let llfn = cx.declare_fn(sym, fn_abi);
         debug!("get_fn: not casting pointer!");
 
         attributes::from_fn_attrs(cx, llfn, instance);

compiler/rustc_codegen_llvm/src/consts.rs

@@ -178,7 +178,7 @@ fn check_and_apply_linkage(
         };
         unsafe {
             // Declare a symbol `foo` with the desired linkage.
-            let g1 = cx.declare_global(&sym, llty2);
+            let g1 = cx.declare_global(sym, llty2);
             llvm::LLVMRustSetLinkage(g1, base::linkage_to_llvm(linkage));
 
             // Declare an internal global `extern_with_linkage_foo` which
@@ -188,7 +188,7 @@ fn check_and_apply_linkage(
             // `extern_with_linkage_foo` will instead be initialized to
             // zero.
             let mut real_name = "_rust_extern_with_linkage_".to_string();
-            real_name.push_str(&sym);
+            real_name.push_str(sym);
             let g2 = cx.define_global(&real_name, llty).unwrap_or_else(|| {
                 cx.sess().span_fatal(
                     cx.tcx.def_span(span_def_id),
@@ -202,7 +202,7 @@ fn check_and_apply_linkage(
     } else {
         // Generate an external declaration.
         // FIXME(nagisa): investigate whether it can be changed into define_global
-        cx.declare_global(&sym, llty)
+        cx.declare_global(sym, llty)
     }
 }
 
@@ -234,7 +234,7 @@ impl CodegenCx<'ll, 'tcx> {
                 _ => self.define_private_global(self.val_ty(cv)),
             };
             llvm::LLVMSetInitializer(gv, cv);
-            set_global_alignment(&self, gv, align);
+            set_global_alignment(self, gv, align);
             llvm::SetUnnamedAddress(gv, llvm::UnnamedAddr::Global);
             gv
         }
@@ -279,7 +279,7 @@ impl CodegenCx<'ll, 'tcx> {
 
             g
         } else {
-            check_and_apply_linkage(&self, &fn_attrs, ty, sym, def_id)
+            check_and_apply_linkage(self, fn_attrs, ty, sym, def_id)
         };
 
         // Thread-local statics in some other crate need to *always* be linked
@@ -369,7 +369,7 @@ impl StaticMethods for CodegenCx<'ll, 'tcx> {
         unsafe {
             let attrs = self.tcx.codegen_fn_attrs(def_id);
 
-            let (v, alloc) = match codegen_static_initializer(&self, def_id) {
+            let (v, alloc) = match codegen_static_initializer(self, def_id) {
                 Ok(v) => v,
                 // Error has already been reported
                 Err(_) => return,
@@ -417,7 +417,7 @@ impl StaticMethods for CodegenCx<'ll, 'tcx> {
                 self.statics_to_rauw.borrow_mut().push((g, new_g));
                 new_g
             };
-            set_global_alignment(&self, g, self.align_of(ty));
+            set_global_alignment(self, g, self.align_of(ty));
             llvm::LLVMSetInitializer(g, v);
 
             if self.should_assume_dso_local(g, true) {
@@ -430,7 +430,7 @@ impl StaticMethods for CodegenCx<'ll, 'tcx> {
                 llvm::LLVMSetGlobalConstant(g, llvm::True);
             }
 
-            debuginfo::create_global_var_metadata(&self, def_id, g);
+            debuginfo::create_global_var_metadata(self, def_id, g);
 
             if attrs.flags.contains(CodegenFnAttrFlags::THREAD_LOCAL) {
                 llvm::set_thread_local_mode(g, self.tls_model);
@@ -518,7 +518,7 @@ impl StaticMethods for CodegenCx<'ll, 'tcx> {
                     );
                 }
             } else {
-                base::set_link_section(g, &attrs);
+                base::set_link_section(g, attrs);
             }
 
             if attrs.flags.contains(CodegenFnAttrFlags::USED) {

compiler/rustc_codegen_llvm/src/context.rs

@@ -363,7 +363,7 @@ impl<'ll, 'tcx> CodegenCx<'ll, 'tcx> {
 
     fn create_used_variable_impl(&self, name: &'static CStr, values: &[&'ll Value]) {
         let section = cstr!("llvm.metadata");
-        let array = self.const_array(&self.type_ptr_to(self.type_i8()), values);
+        let array = self.const_array(self.type_ptr_to(self.type_i8()), values);
 
         unsafe {
             let g = llvm::LLVMAddGlobal(self.llmod, self.val_ty(array), name.as_ptr());
@@ -447,7 +447,7 @@ impl MiscMethods<'tcx> for CodegenCx<'ll, 'tcx> {
     }
 
     fn sess(&self) -> &Session {
-        &self.tcx.sess
+        self.tcx.sess
     }
 
     fn check_overflow(&self) -> bool {

compiler/rustc_codegen_llvm/src/coverageinfo/mapgen.rs

@@ -73,7 +73,7 @@ pub fn finalize<'ll, 'tcx>(cx: &CodegenCx<'ll, 'tcx>) {
             mapgen.write_coverage_mapping(expressions, counter_regions, coverage_mapping_buffer);
         });
         debug_assert!(
-            coverage_mapping_buffer.len() > 0,
+            !coverage_mapping_buffer.is_empty(),
             "Every `FunctionCoverage` should have at least one counter"
         );
 
@@ -311,8 +311,7 @@ fn add_unused_functions<'ll, 'tcx>(cx: &CodegenCx<'ll, 'tcx>) {
     // for each region in it's MIR.
 
     // Convert the `HashSet` of `codegenned_def_ids` to a sortable vector, and sort them.
-    let mut sorted_codegenned_def_ids: Vec<DefId> =
-        codegenned_def_ids.iter().map(|def_id| *def_id).collect();
+    let mut sorted_codegenned_def_ids: Vec<DefId> = codegenned_def_ids.iter().copied().collect();
     sorted_codegenned_def_ids.sort_unstable();
 
     let mut first_covered_def_id_by_file: FxHashMap<Symbol, DefId> = FxHashMap::default();

compiler/rustc_codegen_llvm/src/coverageinfo/mod.rs

@@ -199,8 +199,8 @@ fn declare_unused_fn(cx: &CodegenCx<'ll, 'tcx>, def_id: &DefId) -> Instance<'tcx
     );
 
     let llfn = cx.declare_fn(
-        &tcx.symbol_name(instance).name,
-        &cx.fn_abi_of_fn_ptr(
+        tcx.symbol_name(instance).name,
+        cx.fn_abi_of_fn_ptr(
             ty::Binder::dummy(tcx.mk_fn_sig(
                 iter::once(tcx.mk_unit()),
                 tcx.mk_unit(),

compiler/rustc_codegen_llvm/src/debuginfo/create_scope_map.rs

@@ -41,7 +41,7 @@ pub fn compute_mir_scopes(
     // Instantiate all scopes.
     for idx in 0..mir.source_scopes.len() {
         let scope = SourceScope::new(idx);
-        make_mir_scope(cx, instance, &mir, fn_dbg_scope, &has_variables, debug_context, scope);
+        make_mir_scope(cx, instance, mir, fn_dbg_scope, &has_variables, debug_context, scope);
     }
 }
 
@@ -94,7 +94,7 @@ fn make_mir_scope(
                 callee,
             );
             let callee_fn_abi = cx.fn_abi_of_instance(callee, ty::List::empty());
-            cx.dbg_scope_fn(callee, &callee_fn_abi, None)
+            cx.dbg_scope_fn(callee, callee_fn_abi, None)
         }
         None => unsafe {
             llvm::LLVMRustDIBuilderCreateLexicalBlock(

compiler/rustc_codegen_llvm/src/debuginfo/gdb.rs

@@ -59,10 +59,8 @@ pub fn get_or_insert_gdb_debug_scripts_section_global(cx: &CodegenCx<'ll, '_>) -
 }
 
 pub fn needs_gdb_debug_scripts_section(cx: &CodegenCx<'_, '_>) -> bool {
-    let omit_gdb_pretty_printer_section = cx
-        .tcx
-        .sess
-        .contains_name(&cx.tcx.hir().krate_attrs(), sym::omit_gdb_pretty_printer_section);
+    let omit_gdb_pretty_printer_section =
+        cx.tcx.sess.contains_name(cx.tcx.hir().krate_attrs(), sym::omit_gdb_pretty_printer_section);
 
     !omit_gdb_pretty_printer_section
         && cx.sess().opts.debuginfo != DebugInfo::None