Run code quality analyzers in the coreclr/tools directory

src/coreclr/tools/Common/CommandLine/ArgumentParser.cs

@@ -18,7 +18,7 @@ public ArgumentParser(IEnumerable<string> arguments)
         public ArgumentParser(IEnumerable<string> arguments, Func<string, IEnumerable<string>> responseFileReader)
         {
             if (arguments == null)
-                throw new ArgumentNullException("arguments");
+                throw new ArgumentNullException(nameof(arguments));
 
             _tokens = ArgumentLexer.Lex(arguments, responseFileReader);
         }

src/coreclr/tools/Common/CommandLine/ArgumentSyntax.cs

@@ -34,10 +34,10 @@ internal ArgumentSyntax(IEnumerable<string> arguments)
         public static ArgumentSyntax Parse(IEnumerable<string> arguments, Action<ArgumentSyntax> defineAction)
         {
             if (arguments == null)
-                throw new ArgumentNullException("arguments");
+                throw new ArgumentNullException(nameof(arguments));
 
             if (defineAction == null)
-                throw new ArgumentNullException("defineAction");
+                throw new ArgumentNullException(nameof(defineAction));
 
             var syntax = new ArgumentSyntax(arguments);
             defineAction(syntax);
@@ -107,12 +107,12 @@ public void ReportError(string message)
         public ArgumentCommand<T> DefineCommand<T>(string name, T value)
         {
             if (string.IsNullOrEmpty(name))
-                throw new ArgumentException(Strings.NameMissing, "name");
+                throw new ArgumentException(Strings.NameMissing, nameof(name));
 
             if (!IsValidName(name))
             {
                 var message = string.Format(Strings.CommandNameIsNotValidFmt, name);
-                throw new ArgumentException(message, "name");
+                throw new ArgumentException(message, nameof(name));
             }
 
             if (_commands.Any(c => string.Equals(c.Name, name, StringComparison.Ordinal)))
@@ -143,7 +143,7 @@ public ArgumentCommand<T> DefineCommand<T>(string name, T value)
         public Argument<T> DefineOption<T>(string name, T defaultValue, Func<string, T> valueConverter, bool isRequired)
         {
             if (string.IsNullOrEmpty(name))
-                throw new ArgumentException(Strings.NameMissing, "name");
+                throw new ArgumentException(Strings.NameMissing, nameof(name));
 
             if (DefinedParameters.Any())
                 throw new InvalidOperationException(Strings.OptionsMustBeDefinedBeforeParameters);
@@ -178,7 +178,7 @@ public Argument<T> DefineOption<T>(string name, T defaultValue, Func<string, T>
         public ArgumentList<T> DefineOptionList<T>(string name, IReadOnlyList<T> defaultValue, Func<string, T> valueConverter, bool isRequired)
         {
             if (string.IsNullOrEmpty(name))
-                throw new ArgumentException(Strings.NameMissing, "name");
+                throw new ArgumentException(Strings.NameMissing, nameof(name));
 
             if (DefinedParameters.Any())
                 throw new InvalidOperationException(Strings.OptionsMustBeDefinedBeforeParameters);
@@ -213,12 +213,12 @@ public ArgumentList<T> DefineOptionList<T>(string name, IReadOnlyList<T> default
         public Argument<T> DefineParameter<T>(string name, T defaultValue, Func<string, T> valueConverter)
         {
             if (string.IsNullOrEmpty(name))
-                throw new ArgumentException(Strings.NameMissing, "name");
+                throw new ArgumentException(Strings.NameMissing, nameof(name));
 
             if (!IsValidName(name))
             {
                 var message = string.Format(Strings.ParameterNameIsNotValidFmt, name);
-                throw new ArgumentException(message, "name");
+                throw new ArgumentException(message, nameof(name));
             }
 
             if (DefinedParameters.Any(p => p.IsList))
@@ -252,12 +252,12 @@ public Argument<T> DefineParameter<T>(string name, T defaultValue, Func<string,
         public ArgumentList<T> DefineParameterList<T>(string name, IReadOnlyList<T> defaultValue, Func<string, T> valueConverter)
         {
             if (string.IsNullOrEmpty(name))
-                throw new ArgumentException(Strings.NameMissing, "name");
+                throw new ArgumentException(Strings.NameMissing, nameof(name));
 
             if (!IsValidName(name))
             {
                 var message = string.Format(Strings.ParameterNameIsNotValidFmt, name);
-                throw new ArgumentException(message, "name");
+                throw new ArgumentException(message, nameof(name));
             }
 
             if (DefinedParameters.Any(p => p.IsList))
@@ -304,7 +304,7 @@ private IEnumerable<string> ParseOptionNameList(string name)
                 if (!IsValidName(alias))
                 {
                     var message = string.Format(Strings.OptionNameIsNotValidFmt, alias);
-                    throw new ArgumentException(message, "name");
+                    throw new ArgumentException(message, nameof(name));
                 }
 
                 foreach (var option in DefinedOptions)
@@ -358,8 +358,7 @@ private ArgumentParser Parser
         {
             get
             {
-                if (_parser == null)
-                    _parser = new ArgumentParser(_arguments, ParseResponseFile);
+                _parser ??= new ArgumentParser(_arguments, ParseResponseFile);
 
                 return _parser;
             }
@@ -457,15 +456,15 @@ public string GetHelpText(int maxWidth)
 
         public IReadOnlyList<string> ExtraHelpParagraphs
         {
+            get
+            {
+                return _extraHelpParagraphs.ToArray();
+            }
             set
             {
                 _extraHelpParagraphs.Clear();
                 _extraHelpParagraphs.AddRange(value);
             }
-            get
-            {
-                return _extraHelpParagraphs.ToArray();
-            }
         }
     }
 }

src/coreclr/tools/Common/CommandLine/ArgumentSyntax_Definers.cs

@@ -10,7 +10,7 @@ namespace Internal.CommandLine
     public partial class ArgumentSyntax
     {
         private static readonly Func<string, string> s_stringParser = v => v;
-        private static readonly Func<string, bool> s_booleanParser = v => bool.Parse(v);
+        private static readonly Func<string, bool> s_booleanParser = bool.Parse;
         private static readonly Func<string, int> s_int32Parser = v => int.Parse(v, CultureInfo.InvariantCulture);
 
         // Commands

src/coreclr/tools/Common/CommandLine/ArgumentToken.cs

@@ -49,14 +49,14 @@ private bool Equals(ArgumentToken other)
 
         public override bool Equals(object obj)
         {
-            if (ReferenceEquals(obj, null))
+            if (obj is null)
                 return false;
 
             if (ReferenceEquals(obj, this))
                 return true;
 
             var other = obj as ArgumentToken;
-            return !ReferenceEquals(other, null) && Equals(other);
+            return other is not null && Equals(other);
         }
 
         public override int GetHashCode()

src/coreclr/tools/Common/CommandLine/CommandLineException.cs

@@ -5,7 +5,7 @@
 
 namespace Internal.CommandLine
 {
-    internal class CommandLineException : Exception
+    internal sealed class CommandLineException : Exception
     {
         public CommandLineException(string message)
             : base(message)

src/coreclr/tools/Common/CommandLine/CommandLineHelpers.cs

@@ -12,7 +12,7 @@ namespace Internal.CommandLine
     //
     // Helpers for command line processing
     //
-    internal class Helpers
+    internal static class Helpers
     {
         // Helper to create a collection of paths unique in their simple names.
         public static void AppendExpandedPaths(Dictionary<string, string> dictionary, string pattern, bool strict)
@@ -102,7 +102,7 @@ public static void MakeReproPackage(string makeReproPath, string outputFilePath,
                 }
             }
 
-            HashCode hashCodeOfArgs = new HashCode();
+            HashCode hashCodeOfArgs = default(HashCode);
             foreach (string s in details)
                 hashCodeOfArgs.Add(s);
 
@@ -143,7 +143,7 @@ public static void MakeReproPackage(string makeReproPath, string outputFilePath,
                                 Dictionary<string, string> dictionary = new Dictionary<string, string>();
                                 foreach (string optInList in (IEnumerable)option.Value)
                                 {
-                                    Helpers.AppendExpandedPaths(dictionary, optInList, false);
+                                    AppendExpandedPaths(dictionary, optInList, false);
                                 }
                                 foreach (string inputFile in dictionary.Values)
                                 {

src/coreclr/tools/Common/CommandLine/HelpTextGenerator.cs

@@ -65,7 +65,7 @@ private static void WriteUsage(this StringBuilder sb, string applicationName, IE
             sb.Append(usageHeader);
 
             if (syntaxElements.Any())
-                sb.Append(@" ");
+                sb.Append(' ');
 
             var syntaxIndent = usageHeader.Length + 1;
             var syntaxMaxWidth = maxWidth - syntaxIndent;
@@ -169,7 +169,7 @@ private static string GetOptionSyntax(Argument option)
         {
             var sb = new StringBuilder();
 
-            sb.Append(@"[");
+            sb.Append('[');
             sb.Append(option.GetDisplayName());
 
             if (!option.IsFlag)
@@ -178,7 +178,7 @@ private static string GetOptionSyntax(Argument option)
             if (option.IsList)
                 sb.Append(@"...");
 
-            sb.Append(@"]");
+            sb.Append(']');
 
             return sb.ToString();
         }
@@ -252,7 +252,7 @@ private static IEnumerable<string> WordWrapLines(IEnumerable<string> tokens, int
                 }
 
                 if (sb.Length > 0)
-                    sb.Append(@" ");
+                    sb.Append(' ');
 
                 sb.Append(token);
             }

src/coreclr/tools/Common/Compiler/CodeGenerationFailedException.cs

@@ -19,7 +19,7 @@ public CodeGenerationFailedException(MethodDesc method)
         }
 
         public CodeGenerationFailedException(MethodDesc method, Exception inner)
-            : base(String.Format(MessageText, method), inner)
+            : base(string.Format(MessageText, method), inner)
         {
             Method = method;
         }

src/coreclr/tools/Common/Compiler/CompilerTypeSystemContext.Validation.cs

@@ -9,7 +9,7 @@ namespace ILCompiler
 {
     // Validates types to the extent that is required to make sure the compilation won't fail
     // in unpredictable spots.
-    partial class CompilerTypeSystemContext
+    public partial class CompilerTypeSystemContext
     {
         /// <summary>
         /// Ensures that the type can be fully loaded. The method will throw one of the type system
@@ -33,7 +33,7 @@ public void EnsureLoadableMethod(MethodDesc method)
             }
         }
 
-        class ValidTypeHashTable : LockFreeReaderHashtable<TypeDesc, TypeDesc>
+        private sealed class ValidTypeHashTable : LockFreeReaderHashtable<TypeDesc, TypeDesc>
         {
             protected override bool CompareKeyToValue(TypeDesc key, TypeDesc value) => key == value;
             protected override bool CompareValueToValue(TypeDesc value1, TypeDesc value2) => value1 == value2;

src/coreclr/tools/Common/Compiler/CompilerTypeSystemContext.cs

@@ -21,7 +21,7 @@ public partial class CompilerTypeSystemContext : MetadataTypeSystemContext, IMet
 
         private MetadataStringDecoder _metadataStringDecoder;
 
-        private class ModuleData
+        private sealed class ModuleData
         {
             public string SimpleName;
             public string FilePath;
@@ -30,7 +30,7 @@ private class ModuleData
             public MemoryMappedViewAccessor MappedViewAccessor;
         }
 
-        private class ModuleHashtable : LockFreeReaderHashtable<EcmaModule, ModuleData>
+        private sealed class ModuleHashtable : LockFreeReaderHashtable<EcmaModule, ModuleData>
         {
             protected override int GetKeyHashCode(EcmaModule key)
             {
@@ -42,11 +42,11 @@ protected override int GetValueHashCode(ModuleData value)
             }
             protected override bool CompareKeyToValue(EcmaModule key, ModuleData value)
             {
-                return Object.ReferenceEquals(key, value.Module);
+                return ReferenceEquals(key, value.Module);
             }
             protected override bool CompareValueToValue(ModuleData value1, ModuleData value2)
             {
-                return Object.ReferenceEquals(value1.Module, value2.Module);
+                return ReferenceEquals(value1.Module, value2.Module);
             }
             protected override ModuleData CreateValueFromKey(EcmaModule key)
             {
@@ -56,9 +56,9 @@ protected override ModuleData CreateValueFromKey(EcmaModule key)
         }
         private readonly ModuleHashtable _moduleHashtable = new ModuleHashtable();
 
-        private class SimpleNameHashtable : LockFreeReaderHashtable<string, ModuleData>
+        private sealed class SimpleNameHashtable : LockFreeReaderHashtable<string, ModuleData>
         {
-            StringComparer _comparer = StringComparer.OrdinalIgnoreCase;
+            private StringComparer _comparer = StringComparer.OrdinalIgnoreCase;
 
             protected override int GetKeyHashCode(string key)
             {
@@ -254,10 +254,8 @@ private EcmaModule AddModule(string filePath, string expectedSimpleName, bool us
             }
             finally
             {
-                if (mappedViewAccessor != null)
-                    mappedViewAccessor.Dispose();
-                if (pdbReader != null)
-                    pdbReader.Dispose();
+                mappedViewAccessor?.Dispose();
+                pdbReader?.Dispose();
             }
         }
 
@@ -314,8 +312,7 @@ protected override TypeDesc ConvertToCanon(TypeDesc typeToConvert, ref Canonical
 
         public MetadataStringDecoder GetMetadataStringDecoder()
         {
-            if (_metadataStringDecoder == null)
-                _metadataStringDecoder = new CachingMetadataStringDecoder(0x10000); // TODO: Tune the size
+            _metadataStringDecoder ??= new CachingMetadataStringDecoder(0x10000); // TODO: Tune the size
             return _metadataStringDecoder;
         }
 
@@ -354,11 +351,8 @@ private PdbSymbolReader OpenAssociatedSymbolFile(string peFilePath, PEReader peR
 
             // Try to open the symbol file as portable pdb first
             PdbSymbolReader reader = PortablePdbSymbolReader.TryOpen(pdbFileName, GetMetadataStringDecoder(), pdbContentId);
-            if (reader == null)
-            {
-                // Fallback to the diasymreader for non-portable pdbs
-                reader = UnmanagedPdbSymbolReader.TryOpenSymbolReaderForMetadataFile(peFilePath, Path.GetDirectoryName(pdbFileName));
-            }
+            // Fallback to the diasymreader for non-portable pdbs
+            reader ??= UnmanagedPdbSymbolReader.TryOpenSymbolReaderForMetadataFile(peFilePath, Path.GetDirectoryName(pdbFileName));
 
             return reader;
         }

src/coreclr/tools/Common/Compiler/DependencyAnalysis/CompilerComparer.cs

@@ -1,7 +1,6 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
-using System;
 using System.Diagnostics;
 using System.Collections.Generic;
 

src/coreclr/tools/Common/Compiler/DependencyAnalysis/EmbeddedDataContainerNode.cs

@@ -1,12 +1,10 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
-using Internal.TypeSystem;
-
 namespace ILCompiler.DependencyAnalysis
 {
     /// <summary>
-    /// Represents a node that contains a set of embedded objects. The main function is 
+    /// Represents a node that contains a set of embedded objects. The main function is
     /// to serve as a base class, providing symbol name boundaries and node ordering.
     /// </summary>
     public abstract class EmbeddedDataContainerNode : ObjectNode

src/coreclr/tools/Common/Compiler/DependencyAnalysis/INodeWithRuntimeDeterminedDependencies.cs

@@ -4,11 +4,10 @@
 using System.Collections.Generic;
 
 using Internal.TypeSystem;
+using DependencyListEntry = ILCompiler.DependencyAnalysisFramework.DependencyNodeCore<ILCompiler.DependencyAnalysis.NodeFactory>.DependencyListEntry;
 
 namespace ILCompiler.DependencyAnalysis
 {
-    using DependencyListEntry = DependencyAnalysisFramework.DependencyNodeCore<NodeFactory>.DependencyListEntry;
-
     /// <summary>
     /// Represents a node whose dependencies are runtime determined (they depend on the generic context)
     /// and which provides means to compute concrete dependencies when given the generic context.

src/coreclr/tools/Common/Compiler/DependencyAnalysis/ISymbolNode.cs

@@ -76,13 +76,12 @@ public interface ISymbolDefinitionNode : ISymbolNode
     public static class ISymbolNodeExtensions
     {
         [ThreadStatic]
-        static Utf8StringBuilder s_cachedUtf8StringBuilder;
+        private static Utf8StringBuilder s_cachedUtf8StringBuilder;
 
         public static string GetMangledName(this ISymbolNode symbolNode, NameMangler nameMangler)
         {
             Utf8StringBuilder sb = s_cachedUtf8StringBuilder;
-            if (sb == null)
-                sb = new Utf8StringBuilder();
+            sb ??= new Utf8StringBuilder();
 
             symbolNode.AppendMangledName(nameMangler, sb);
             string ret = sb.ToString();

src/coreclr/tools/Common/Compiler/DependencyAnalysis/MethodReadOnlyDataNode.cs

@@ -1,7 +1,6 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
-using System;
 using System.Diagnostics;
 
 using Internal.Text;
@@ -52,4 +51,3 @@ public override int CompareToImpl(ISortableNode other, CompilerComparer comparer
 #endif
     }
 }
-