Code cleanup and some optimizations (#1911)

* Code cleanup

* Run symbol conversion in parallel

* Fix build error in p/invoke move

* Fix debug compile

* Address review comments

src/AST/Class.cs

@@ -74,31 +74,31 @@ namespace CppSharp.AST
     // Represents a C++ record decl.
     public class Class : DeclarationContext
     {
-        public List<BaseClassSpecifier> Bases;
-        public List<Field> Fields;
-        public List<Property> Properties;
-        public List<Method> Methods;
-        public List<AccessSpecifierDecl> Specifiers;
+        public List<BaseClassSpecifier> Bases = new();
+        public List<Field> Fields = new();
+        public List<Property> Properties = new();
+        public List<Method> Methods = new();
+        public List<AccessSpecifierDecl> Specifiers = new();
 
         // True if the record is a POD (Plain Old Data) type.
-        public bool IsPOD;
+        public bool IsPOD = false;
 
         // Semantic type of the class.
-        public ClassType Type;
+        public ClassType Type = ClassType.RefType;
 
         // ABI-specific class layout.
-        public ClassLayout Layout;
+        public ClassLayout Layout = new();
 
         // True if class provides pure virtual methods.
-        public bool IsAbstract;
+        public bool IsAbstract = false;
 
         // True if the type is to be treated as a union.
-        public bool IsUnion;
+        public bool IsUnion = false;
 
         public TagKind TagKind { get; set; }
 
         // True if the class is final / sealed.
-        public bool IsFinal { get; set; }
+        public bool IsFinal { get; set; } = false;
 
         private bool? isOpaque;
 
@@ -129,23 +129,6 @@ namespace CppSharp.AST
         // True if the class represents a static class.
         public bool IsStatic;
 
-        public Class()
-        {
-            Bases = new List<BaseClassSpecifier>();
-            Fields = new List<Field>();
-            Properties = new List<Property>();
-            Methods = new List<Method>();
-            Specifiers = new List<AccessSpecifierDecl>();
-            IsAbstract = false;
-            IsUnion = false;
-            IsFinal = false;
-            IsPOD = false;
-            Type = ClassType.RefType;
-            Layout = new ClassLayout();
-            templateParameters = new List<Declaration>();
-            specializations = new List<ClassTemplateSpecialization>();
-        }
-
         public bool HasBase => Bases.Count > 0;
 
         public bool HasBaseClass => BaseClass != null;
@@ -296,7 +279,7 @@ namespace CppSharp.AST
             return visitor.VisitClassDecl(this);
         }
 
-        private List<Declaration> templateParameters;
-        private List<ClassTemplateSpecialization> specializations;
+        private readonly List<Declaration> templateParameters = new();
+        private readonly List<ClassTemplateSpecialization> specializations = new();
     }
 }

src/AST/DeclarationsList.cs

@@ -59,7 +59,10 @@ namespace CppSharp.AST
             base.RemoveItem(index);
             for (var i = Kind.Namespace; i <= Kind.Event; i++)
             {
-                if (offsets.ContainsKey(i) && index < offsets[i])
+                if (!offsets.TryGetValue(i, out int start))
+                    continue;
+                
+                if (index < start)
                 {
                     offsets[i]--;
                 }
@@ -74,12 +77,11 @@ namespace CppSharp.AST
 
         private IEnumerable<T> OfType<T>(Kind kind) where T : Declaration
         {
-            if (!offsets.ContainsKey(kind))
+            if (!offsets.TryGetValue(kind, out var offset))
             {
                 yield break;
             }
 
-            var offset = offsets[kind];
             for (var i = GetStart(kind); i < offset; i++)
             {
                 yield return (T)this[i];
@@ -105,28 +107,30 @@ namespace CppSharp.AST
 
         private int GetOffset(Kind kind)
         {
-            if (offsets.ContainsKey(kind))
-                return offsets[kind];
+            if (offsets.TryGetValue(kind, out int o))
+                return o;
 
+            // First time we see this kind of declaration. Insert it between the previous and next kinds.
             for (var i = kind - 1; i >= Kind.Namespace; i--)
             {
-                if (offsets.ContainsKey(i))
-                {
-                    return offsets[kind] = offsets[i];
-                }
+                if (!offsets.TryGetValue(i, out var start)) 
+                    continue;
+
+                offsets[kind] = start;
+                return start;
             }
 
             offsets[kind] = 0;
-            return offsets[kind];
+            return 0;
         }
 
         private int GetStart(Kind kind)
         {
             for (var i = kind - 1; i >= Kind.Namespace; i--)
             {
-                if (offsets.ContainsKey(i))
+                if (offsets.TryGetValue(i, out var start))
                 {
-                    return offsets[i];
+                    return start;
                 }
             }
             return 0;
@@ -154,7 +158,7 @@ namespace CppSharp.AST
             return middle;
         }
 
-        private Dictionary<Kind, int> offsets = new Dictionary<Kind, int>();
+        private readonly Dictionary<Kind, int> offsets = new();
 
         private enum Kind
         {

src/AST/Namespace.cs

@@ -36,15 +36,9 @@ namespace CppSharp.AST
         // True if the context is inside an extern "C" context.
         public bool IsExternCContext;
 
-        public override string LogicalName
-        {
-            get { return IsAnonymous ? "<anonymous>" : base.Name; }
-        }
+        public override string LogicalName => IsAnonymous ? "<anonymous>" : base.Name;
 
-        public override string LogicalOriginalName
-        {
-            get { return IsAnonymous ? "<anonymous>" : base.OriginalName; }
-        }
+        public override string LogicalOriginalName => IsAnonymous ? "<anonymous>" : base.OriginalName;
 
         protected DeclarationContext()
         {
@@ -80,7 +74,7 @@ namespace CppSharp.AST
 
         public Declaration FindAnonymous(ulong key)
         {
-            return Anonymous.ContainsKey(key) ? Anonymous[key] : null;
+            return Anonymous.GetValueOrDefault(key);
         }
 
         public Namespace FindNamespace(string name)
@@ -172,7 +166,7 @@ namespace CppSharp.AST
             {
                 var functions = Functions.Where(e => e.Name.Equals(name));
 
-                if (!functions.Any() && createDecl)
+                if (createDecl && !functions.Any())
                 {
                     var function = new Function() { Name = name, Namespace = this };
                     Declarations.Add(function);

src/AST/SymbolContext.cs

@@ -80,14 +80,12 @@ namespace CppSharp.AST
             {
                 foreach (var symbol in library.Symbols)
                 {
-                    if (!Symbols.ContainsKey(symbol))
-                        Symbols[symbol] = library;
-                    if (symbol.StartsWith("__", StringComparison.Ordinal))
-                    {
-                        string stripped = symbol.Substring(1);
-                        if (!Symbols.ContainsKey(stripped))
-                            Symbols[stripped] = library;
-                    }
+                    Symbols.TryAdd(symbol, library);
+
+                    if (!symbol.StartsWith("__", StringComparison.Ordinal))
+                        continue;
+
+                    Symbols.TryAdd(symbol[1..], library);
                 }
             }
         }

src/Core/Platform.cs

@@ -17,29 +17,19 @@ namespace CppSharp
 
     public static class Platform
     {
-        public static bool IsWindows
-        {
-            get
-            {
-                switch (Environment.OSVersion.Platform)
-                {
-                    case PlatformID.Win32NT:
-                    case PlatformID.Win32S:
-                    case PlatformID.Win32Windows:
-                    case PlatformID.WinCE:
-                        return true;
-                }
+        public static bool IsWindows =>
+            Environment.OSVersion.Platform switch
+            {
+                PlatformID.Win32NT => true,
+                PlatformID.Win32S => true,
+                PlatformID.Win32Windows => true,
+                PlatformID.WinCE => true,
+                _ => false
+            };
 
-                return false;
-            }
-        }
-
-        [DllImport("libc")]
-        static extern int uname(IntPtr buf);
+        public static bool IsMacOS { get; } = GetIsMacOS();
 
-        public static bool IsMacOS
-        {
-            get
+        private static bool GetIsMacOS()
         {
             if (Environment.OSVersion.Platform != PlatformID.Unix)
                 return false;
@@ -57,31 +47,27 @@ namespace CppSharp
             Marshal.FreeHGlobal(buf);
 
             return false;
-            }
-        }
 
-        public static bool IsLinux
-        {
-            get { return Environment.OSVersion.Platform == PlatformID.Unix && !IsMacOS; }
+            [DllImport("libc")]
+            static extern int uname(IntPtr buf);
         }
 
-        public static bool IsMono
-        {
-            get { return Type.GetType("Mono.Runtime") != null; }
-        }
+        public static bool IsLinux => Environment.OSVersion.Platform == PlatformID.Unix && !IsMacOS;
+
+        public static bool IsMono => Type.GetType("Mono.Runtime") != null;
 
         public static bool IsUnixPlatform
         {
             get
             {
                 var platform = Environment.OSVersion.Platform;
-                return platform == PlatformID.Unix || platform == PlatformID.MacOSX;
+                return platform is PlatformID.Unix or PlatformID.MacOSX;
             }
         }
 
-        public static TargetPlatform Host
-        {
-            get
+        public static TargetPlatform Host { get; } = GetHostPlatform();
+
+        private static TargetPlatform GetHostPlatform()
         {
             if (IsWindows)
                 return TargetPlatform.Windows;
@@ -96,4 +82,3 @@ namespace CppSharp
         }
     }
 }
-}

src/CppParser/AST.cpp

@@ -935,7 +935,7 @@ ASTContext::ASTContext() {}
 
 ASTContext::~ASTContext() {}
 
-TranslationUnit* ASTContext::FindOrCreateModule(std::string File)
+TranslationUnit* ASTContext::FindOrCreateModule(const std::string& File)
 {
     auto normalizedFile = normalizePath(File);
 

src/CppParser/ASTNameMangler.cpp

@@ -40,7 +40,7 @@ ASTNameMangler::ASTNameMangler(ASTContext& Ctx)
 {
 }
 
-std::string ASTNameMangler::GetName(const Decl* D) {
+std::string ASTNameMangler::GetName(const Decl* D) const {
     std::string Name;
     {
         llvm::raw_string_ostream OS(Name);
@@ -49,8 +49,7 @@ std::string ASTNameMangler::GetName(const Decl* D) {
     return Name;
 }
 
-bool ASTNameMangler::WriteName(const Decl* D, raw_ostream& OS) {
-    // First apply frontend mangling.
+bool ASTNameMangler::WriteName(const Decl* D, raw_ostream& OS) const {
     if (auto* FD = dyn_cast<FunctionDecl>(D)) {
         if (FD->isDependentContext())
             return true;
@@ -62,8 +61,7 @@ bool ASTNameMangler::WriteName(const Decl* D, raw_ostream& OS) {
             return true;
     }
     else if (auto* MD = dyn_cast<ObjCMethodDecl>(D)) {
-        MC->mangleObjCMethodName(MD, OS, /*includePrefixByte=*/false,
-            /*includeCategoryNamespace=*/true);
+        MC->mangleObjCMethodName(MD, OS, /*includePrefixByte=*/false, /*includeCategoryNamespace=*/true);
         return false;
     }
     else if (auto* ID = dyn_cast<ObjCInterfaceDecl>(D)) {
@@ -76,7 +74,7 @@ bool ASTNameMangler::WriteName(const Decl* D, raw_ostream& OS) {
     return false;
 }
 
-std::string ASTNameMangler::GetMangledStructor(const NamedDecl* ND, unsigned StructorType) {
+std::string ASTNameMangler::GetMangledStructor(const NamedDecl* ND, unsigned StructorType) const {
     std::string FrontendBuf;
     llvm::raw_string_ostream FOS(FrontendBuf);
 
@@ -90,7 +88,7 @@ std::string ASTNameMangler::GetMangledStructor(const NamedDecl* ND, unsigned Str
     return FrontendBuf;
 }
 
-std::string ASTNameMangler::GetMangledThunk(const CXXMethodDecl* MD, const ThunkInfo& T, bool /*ElideOverrideInfo*/) {
+std::string ASTNameMangler::GetMangledThunk(const CXXMethodDecl* MD, const ThunkInfo& T, bool /*ElideOverrideInfo*/) const {
     std::string FrontendBuf;
     llvm::raw_string_ostream FOS(FrontendBuf);
 

src/CppParser/ASTNameMangler.h

@@ -35,12 +35,12 @@ class ASTNameMangler
 public:
     explicit ASTNameMangler(clang::ASTContext& Ctx);
 
-    std::string GetName(const clang::Decl* D);
-    bool WriteName(const clang::Decl* D, llvm::raw_ostream& OS);
+    std::string GetName(const clang::Decl* D) const;
+    bool WriteName(const clang::Decl* D, llvm::raw_ostream& OS) const;
 
 private:
-    std::string GetMangledStructor(const clang::NamedDecl* ND, unsigned StructorType);
-    std::string GetMangledThunk(const clang::CXXMethodDecl* MD, const clang::ThunkInfo& T, bool ElideOverrideInfo);
+    std::string GetMangledStructor(const clang::NamedDecl* ND, unsigned StructorType) const;
+    std::string GetMangledThunk(const clang::CXXMethodDecl* MD, const clang::ThunkInfo& T, bool ElideOverrideInfo) const;
     bool WriteFuncOrVarName(const clang::NamedDecl* D, llvm::raw_ostream& OS) const;
     
     llvm::DataLayout DL;

src/CppParser/Bindings/CSharp/i686-pc-win32-msvc-d/CppSharp.CppParser.cs

@@ -15795,8 +15795,8 @@ namespace CppSharp
                     [SuppressUnmanagedCodeSecurity, DllImport("CppSharp.CppParser.dll", EntryPoint = "??1ASTContext@AST@CppParser@CppSharp@@QAE@XZ", CallingConvention = __CallingConvention.ThisCall)]
                     internal static extern void dtor(__IntPtr __instance);
 
-                    [SuppressUnmanagedCodeSecurity, DllImport("CppSharp.CppParser.dll", EntryPoint = "?FindOrCreateModule@ASTContext@AST@CppParser@CppSharp@@QAEPAVTranslationUnit@234@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z", CallingConvention = __CallingConvention.ThisCall)]
-                    internal static extern __IntPtr FindOrCreateModule(__IntPtr __instance, global::Std.BasicString.__Internalc__N_std_S_basic_string__C___N_std_S_char_traits__C___N_std_S_allocator__C File);
+                    [SuppressUnmanagedCodeSecurity, DllImport("CppSharp.CppParser.dll", EntryPoint = "?FindOrCreateModule@ASTContext@AST@CppParser@CppSharp@@QAEPAVTranslationUnit@234@ABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z", CallingConvention = __CallingConvention.ThisCall)]
+                    internal static extern __IntPtr FindOrCreateModule(__IntPtr __instance, __IntPtr File);
 
                     [SuppressUnmanagedCodeSecurity, DllImport("CppSharp.CppParser.dll", EntryPoint = "?getTranslationUnits@ASTContext@AST@CppParser@CppSharp@@QAEPAVTranslationUnit@234@I@Z", CallingConvention = __CallingConvention.ThisCall)]
                     internal static extern __IntPtr GetTranslationUnits(__IntPtr __instance, uint i);
@@ -15917,9 +15917,9 @@ namespace CppSharp
                 {
                     var __basicString0 = new global::Std.BasicString<sbyte, global::Std.CharTraits<sbyte>, global::Std.Allocator<sbyte>>();
                     global::Std.BasicStringExtensions.Assign(__basicString0, File);
-                    var __arg0 = *(global::Std.BasicString.__Internalc__N_std_S_basic_string__C___N_std_S_char_traits__C___N_std_S_allocator__C*) __basicString0.__Instance;
+                    var __arg0 = __basicString0.__Instance;
                     var ___ret = __Internal.FindOrCreateModule(__Instance, __arg0);
-                    __basicString0.Dispose(disposing: true, callNativeDtor:false);
+                    __basicString0.Dispose();
                     var __result0 = global::CppSharp.Parser.AST.TranslationUnit.__GetOrCreateInstance(___ret, false);
                     return __result0;
                 }

src/CppParser/Bindings/CSharp/i686-pc-win32-msvc/CppSharp.CppParser.cs

@@ -15795,8 +15795,8 @@ namespace CppSharp
                     [SuppressUnmanagedCodeSecurity, DllImport("CppSharp.CppParser.dll", EntryPoint = "??1ASTContext@AST@CppParser@CppSharp@@QAE@XZ", CallingConvention = __CallingConvention.ThisCall)]
                     internal static extern void dtor(__IntPtr __instance);
 
-                    [SuppressUnmanagedCodeSecurity, DllImport("CppSharp.CppParser.dll", EntryPoint = "?FindOrCreateModule@ASTContext@AST@CppParser@CppSharp@@QAEPAVTranslationUnit@234@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z", CallingConvention = __CallingConvention.ThisCall)]
-                    internal static extern __IntPtr FindOrCreateModule(__IntPtr __instance, global::Std.BasicString.__Internalc__N_std_S_basic_string__C___N_std_S_char_traits__C___N_std_S_allocator__C File);
+                    [SuppressUnmanagedCodeSecurity, DllImport("CppSharp.CppParser.dll", EntryPoint = "?FindOrCreateModule@ASTContext@AST@CppParser@CppSharp@@QAEPAVTranslationUnit@234@ABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z", CallingConvention = __CallingConvention.ThisCall)]
+                    internal static extern __IntPtr FindOrCreateModule(__IntPtr __instance, __IntPtr File);
 
                     [SuppressUnmanagedCodeSecurity, DllImport("CppSharp.CppParser.dll", EntryPoint = "?getTranslationUnits@ASTContext@AST@CppParser@CppSharp@@QAEPAVTranslationUnit@234@I@Z", CallingConvention = __CallingConvention.ThisCall)]
                     internal static extern __IntPtr GetTranslationUnits(__IntPtr __instance, uint i);
@@ -15917,9 +15917,9 @@ namespace CppSharp
                 {
                     var __basicString0 = new global::Std.BasicString<sbyte, global::Std.CharTraits<sbyte>, global::Std.Allocator<sbyte>>();
                     global::Std.BasicStringExtensions.Assign(__basicString0, File);
-                    var __arg0 = *(global::Std.BasicString.__Internalc__N_std_S_basic_string__C___N_std_S_char_traits__C___N_std_S_allocator__C*) __basicString0.__Instance;
+                    var __arg0 = __basicString0.__Instance;
                     var ___ret = __Internal.FindOrCreateModule(__Instance, __arg0);
-                    __basicString0.Dispose(disposing: true, callNativeDtor:false);
+                    __basicString0.Dispose();
                     var __result0 = global::CppSharp.Parser.AST.TranslationUnit.__GetOrCreateInstance(___ret, false);
                     return __result0;
                 }

src/CppParser/Bindings/CSharp/x86_64-pc-win32-msvc-d/CppSharp.CppParser.cs

@@ -15796,7 +15796,7 @@ namespace CppSharp
                     [SuppressUnmanagedCodeSecurity, DllImport("CppSharp.CppParser.dll", EntryPoint = "??1ASTContext@AST@CppParser@CppSharp@@QEAA@XZ", CallingConvention = __CallingConvention.Cdecl)]
                     internal static extern void dtor(__IntPtr __instance);
 
-                    [SuppressUnmanagedCodeSecurity, DllImport("CppSharp.CppParser.dll", EntryPoint = "?FindOrCreateModule@ASTContext@AST@CppParser@CppSharp@@QEAAPEAVTranslationUnit@234@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z", CallingConvention = __CallingConvention.Cdecl)]
+                    [SuppressUnmanagedCodeSecurity, DllImport("CppSharp.CppParser.dll", EntryPoint = "?FindOrCreateModule@ASTContext@AST@CppParser@CppSharp@@QEAAPEAVTranslationUnit@234@AEBV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z", CallingConvention = __CallingConvention.Cdecl)]
                     internal static extern __IntPtr FindOrCreateModule(__IntPtr __instance, __IntPtr File);
 
                     [SuppressUnmanagedCodeSecurity, DllImport("CppSharp.CppParser.dll", EntryPoint = "?getTranslationUnits@ASTContext@AST@CppParser@CppSharp@@QEAAPEAVTranslationUnit@234@I@Z", CallingConvention = __CallingConvention.Cdecl)]
@@ -15920,7 +15920,7 @@ namespace CppSharp
                     global::Std.BasicStringExtensions.Assign(__basicString0, File);
                     var __arg0 = __basicString0.__Instance;
                     var ___ret = __Internal.FindOrCreateModule(__Instance, __arg0);
-                    __basicString0.Dispose(disposing: true, callNativeDtor:false);
+                    __basicString0.Dispose();
                     var __result0 = global::CppSharp.Parser.AST.TranslationUnit.__GetOrCreateInstance(___ret, false);
                     return __result0;
                 }

src/CppParser/Bindings/CSharp/x86_64-pc-win32-msvc/CppSharp.CppParser.cs

@@ -15796,7 +15796,7 @@ namespace CppSharp
                     [SuppressUnmanagedCodeSecurity, DllImport("CppSharp.CppParser.dll", EntryPoint = "??1ASTContext@AST@CppParser@CppSharp@@QEAA@XZ", CallingConvention = __CallingConvention.Cdecl)]
                     internal static extern void dtor(__IntPtr __instance);
 
-                    [SuppressUnmanagedCodeSecurity, DllImport("CppSharp.CppParser.dll", EntryPoint = "?FindOrCreateModule@ASTContext@AST@CppParser@CppSharp@@QEAAPEAVTranslationUnit@234@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z", CallingConvention = __CallingConvention.Cdecl)]
+                    [SuppressUnmanagedCodeSecurity, DllImport("CppSharp.CppParser.dll", EntryPoint = "?FindOrCreateModule@ASTContext@AST@CppParser@CppSharp@@QEAAPEAVTranslationUnit@234@AEBV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z", CallingConvention = __CallingConvention.Cdecl)]
                     internal static extern __IntPtr FindOrCreateModule(__IntPtr __instance, __IntPtr File);
 
                     [SuppressUnmanagedCodeSecurity, DllImport("CppSharp.CppParser.dll", EntryPoint = "?getTranslationUnits@ASTContext@AST@CppParser@CppSharp@@QEAAPEAVTranslationUnit@234@I@Z", CallingConvention = __CallingConvention.Cdecl)]
@@ -15920,7 +15920,7 @@ namespace CppSharp
                     global::Std.BasicStringExtensions.Assign(__basicString0, File);
                     var __arg0 = __basicString0.__Instance;
                     var ___ret = __Internal.FindOrCreateModule(__Instance, __arg0);
-                    __basicString0.Dispose(disposing: true, callNativeDtor:false);
+                    __basicString0.Dispose();
                     var __result0 = global::CppSharp.Parser.AST.TranslationUnit.__GetOrCreateInstance(___ret, false);
                     return __result0;
                 }

src/CppParser/Comments.cpp

@@ -11,6 +11,7 @@
 #include <clang/AST/ASTContext.h>
 
 using namespace CppSharp::CppParser;
+using namespace CppSharp::CppParser::AST;
 
 //-----------------------------------//
 
@@ -39,7 +40,7 @@ RawComment* Parser::WalkRawComment(const clang::RawComment* RC)
     using namespace clang;
 
     auto& SM = c->getSourceManager();
-    auto Comment = new RawComment();
+    auto Comment = new AST::RawComment();
     Comment->kind = ConvertRawCommentKind(RC->getKind());
     Comment->text = RC->getRawText(SM).str();
     Comment->briefText = RC->getBriefText(c->getASTContext());

src/CppParser/CppParser.cpp

@@ -13,17 +13,7 @@
 namespace CppSharp { namespace CppParser {
 
 CppParserOptions::CppParserOptions()
-    : ASTContext(0)
-    , toolSetToUse(0)
-    , noStandardIncludes(false)
-    , noBuiltinIncludes(false)
-    , microsoftMode(false)
-    , verbose(false)
-    , unityBuild(false)
-    , skipPrivateDeclarations(true)
-    , skipLayoutInfo(false)
-    , skipFunctionBodies(true)
-    , clangVersion(CLANG_VERSION_STRING)
+    : clangVersion(CLANG_VERSION_STRING)
 {
 }
 
@@ -59,7 +49,7 @@ ParserResult::~ParserResult()
 }
 
 DEF_VECTOR(ParserResult, ParserDiagnostic, Diagnostics)
-DEF_VECTOR(ParserResult, NativeLibrary*, Libraries)
+DEF_VECTOR(ParserResult, AST::NativeLibrary*, Libraries)
 
 CppLinkerOptions::CppLinkerOptions()
 {

src/CppParser/CppParser.h

@@ -16,8 +16,6 @@
 
 namespace CppSharp { namespace CppParser {
 
-using namespace CppSharp::CppParser::AST;
-
 struct CS_API CppParserOptions
 {
     CppParserOptions();
@@ -38,19 +36,19 @@ struct CS_API CppParserOptions
     VECTOR_STRING(SupportedStdTypes)
     VECTOR_STRING(SupportedFunctionTemplates)
 
-    CppSharp::CppParser::AST::ASTContext* ASTContext;
+    AST::ASTContext* ASTContext = nullptr;
 
-    int toolSetToUse;
+    int toolSetToUse = 0;
     std::string targetTriple;
 
-    bool noStandardIncludes;
-    bool noBuiltinIncludes;
-    bool microsoftMode;
-    bool verbose;
-    bool unityBuild;
-    bool skipPrivateDeclarations;
-    bool skipLayoutInfo;
-    bool skipFunctionBodies;
+    bool noStandardIncludes = false;
+    bool noBuiltinIncludes = false;
+    bool microsoftMode = false;
+    bool verbose = false;
+    bool unityBuild = false;
+    bool skipPrivateDeclarations = true;
+    bool skipLayoutInfo = false;
+    bool skipFunctionBodies = true;
 
 private:
     std::string clangVersion;
@@ -104,7 +102,7 @@ struct CS_API ParserResult
 
     ParserResultKind kind = ParserResultKind::Error;
     VECTOR(ParserDiagnostic, Diagnostics)
-    VECTOR(NativeLibrary*, Libraries)
+    VECTOR(AST::NativeLibrary*, Libraries)
     ParserTargetInfo* targetInfo = nullptr;
 };
 

src/CppParser/Decl.h

@@ -839,7 +839,7 @@ namespace CppSharp
             public:
                 ASTContext();
                 ~ASTContext();
-                TranslationUnit *FindOrCreateModule(std::string File);
+                TranslationUnit *FindOrCreateModule(const std::string& File);
                 VECTOR(TranslationUnit *, TranslationUnits)
             };
 

src/CppParser/ParseExpr.cpp

@@ -11,7 +11,8 @@
 #include <clang/AST/Expr.h>
 #include <clang/AST/ExprCXX.h>
 
-namespace CppSharp { namespace CppParser {
+namespace CppSharp::CppParser {
+using namespace AST;
 
 AST::Expr* Parser::WalkExpression(const clang::Expr* Expr)
 {
@@ -2402,4 +2403,4 @@ AST::Expr* Parser::WalkExpression(const clang::Expr* Expr)
     return _Expr;
 }
 
-} }
+}

src/CppParser/Parser.h

@@ -51,6 +51,7 @@ namespace CppSharp { namespace CppParser {
 
 class Parser
 {
+    friend class ASTNodeVisitor;
 public:
     Parser(CppParserOptions* Opts);
 
@@ -61,8 +62,8 @@ public:
     ParserResult* Compile(const std::string& File);
     bool Link(const std::string& File, const CppLinkerOptions* LinkerOptions);
     void WalkAST(clang::TranslationUnitDecl* TU);
-    void HandleDeclaration(const clang::Decl* D, Declaration* Decl);
-    CppParserOptions* opts;
+    void HandleDeclaration(const clang::Decl* D, AST::Declaration* Decl);
+    CppParserOptions* opts = nullptr;
 
 private:
 
@@ -73,54 +74,54 @@ private:
     bool IsSupported(const clang::NamedDecl* ND);
     bool IsSupported(const clang::CXXMethodDecl* MD);
     // AST traversers
-    Declaration* WalkDeclaration(const clang::Decl* D);
-    Declaration* WalkDeclarationDef(clang::Decl* D);
-    Enumeration* WalkEnum(const clang::EnumDecl* ED);
-	Enumeration::Item* WalkEnumItem(clang::EnumConstantDecl* ECD);
-    Function* WalkFunction(const clang::FunctionDecl* FD);
-    void EnsureCompleteRecord(const clang::RecordDecl* Record, DeclarationContext* NS, Class* RC);
-    Class* GetRecord(const clang::RecordDecl* Record, bool& IsComplete);
-    Class* WalkRecord(const clang::RecordDecl* Record);
-    void WalkRecord(const clang::RecordDecl* Record, Class* RC);
-    Class* WalkRecordCXX(const clang::CXXRecordDecl* Record);
-    void WalkRecordCXX(const clang::CXXRecordDecl* Record, Class* RC);
-    ClassTemplateSpecialization*
+    AST::Declaration* WalkDeclaration(const clang::Decl* D);
+    AST::Declaration* WalkDeclarationDef(clang::Decl* D);
+    AST::Enumeration* WalkEnum(const clang::EnumDecl* ED);
+	AST::Enumeration::Item* WalkEnumItem(clang::EnumConstantDecl* ECD);
+    AST::Function* WalkFunction(const clang::FunctionDecl* FD);
+    void EnsureCompleteRecord(const clang::RecordDecl* Record, AST::DeclarationContext* NS, AST::Class* RC);
+    AST::Class* GetRecord(const clang::RecordDecl* Record, bool& IsComplete);
+    AST::Class* WalkRecord(const clang::RecordDecl* Record);
+    void WalkRecord(const clang::RecordDecl* Record, AST::Class* RC);
+    AST::Class* WalkRecordCXX(const clang::CXXRecordDecl* Record);
+    void WalkRecordCXX(const clang::CXXRecordDecl* Record, AST::Class* RC);
+    AST::ClassTemplateSpecialization*
     WalkClassTemplateSpecialization(const clang::ClassTemplateSpecializationDecl* CTS);
-    ClassTemplatePartialSpecialization*
+    AST::ClassTemplatePartialSpecialization*
     WalkClassTemplatePartialSpecialization(const clang::ClassTemplatePartialSpecializationDecl* CTS);
-    Method* WalkMethodCXX(const clang::CXXMethodDecl* MD);
-    Field* WalkFieldCXX(const clang::FieldDecl* FD, Class* Class);
-    FunctionTemplateSpecialization* WalkFunctionTemplateSpec(clang::FunctionTemplateSpecializationInfo* FTS, Function* Function);
-    Variable* WalkVariable(const clang::VarDecl* VD);
-    void WalkVariable(const clang::VarDecl* VD, Variable* Var);
-    Friend* WalkFriend(const clang::FriendDecl* FD);
-    RawComment* WalkRawComment(const clang::RawComment* RC);
-    Type* WalkType(clang::QualType QualType, const clang::TypeLoc* TL = 0,
+    AST::Method* WalkMethodCXX(const clang::CXXMethodDecl* MD);
+    AST::Field* WalkFieldCXX(const clang::FieldDecl* FD, AST::Class* Class);
+    AST::FunctionTemplateSpecialization* WalkFunctionTemplateSpec(clang::FunctionTemplateSpecializationInfo* FTS, AST::Function* Function);
+    AST::Variable* WalkVariable(const clang::VarDecl* VD);
+    void WalkVariable(const clang::VarDecl* VD, AST::Variable* Var);
+    AST::Friend* WalkFriend(const clang::FriendDecl* FD);
+    AST::RawComment* WalkRawComment(const clang::RawComment* RC);
+    AST::Type* WalkType(clang::QualType QualType, const clang::TypeLoc* TL = 0,
       bool DesugarType = false);
-    TemplateArgument WalkTemplateArgument(const clang::TemplateArgument& TA, clang::TemplateArgumentLoc* ArgLoc = 0);
-    TemplateTemplateParameter* WalkTemplateTemplateParameter(const clang::TemplateTemplateParmDecl* TTP);
-    TypeTemplateParameter* WalkTypeTemplateParameter(const clang::TemplateTypeParmDecl* TTPD);
-    NonTypeTemplateParameter* WalkNonTypeTemplateParameter(const clang::NonTypeTemplateParmDecl* TTPD);
-    UnresolvedUsingTypename* WalkUnresolvedUsingTypename(const clang::UnresolvedUsingTypenameDecl* UUTD);
-    std::vector<Declaration*> WalkTemplateParameterList(const clang::TemplateParameterList* TPL);
-    TypeAliasTemplate* WalkTypeAliasTemplate(const clang::TypeAliasTemplateDecl* TD);
-    ClassTemplate* WalkClassTemplate(const clang::ClassTemplateDecl* TD);
-    FunctionTemplate* WalkFunctionTemplate(const clang::FunctionTemplateDecl* TD);
-    VarTemplate* WalkVarTemplate(const clang::VarTemplateDecl* VT);
-    VarTemplateSpecialization*
+    AST::TemplateArgument WalkTemplateArgument(const clang::TemplateArgument& TA, clang::TemplateArgumentLoc* ArgLoc = 0);
+    AST::TemplateTemplateParameter* WalkTemplateTemplateParameter(const clang::TemplateTemplateParmDecl* TTP);
+    AST::TypeTemplateParameter* WalkTypeTemplateParameter(const clang::TemplateTypeParmDecl* TTPD);
+    AST::NonTypeTemplateParameter* WalkNonTypeTemplateParameter(const clang::NonTypeTemplateParmDecl* TTPD);
+    AST::UnresolvedUsingTypename* WalkUnresolvedUsingTypename(const clang::UnresolvedUsingTypenameDecl* UUTD);
+    std::vector<AST::Declaration*> WalkTemplateParameterList(const clang::TemplateParameterList* TPL);
+    AST::TypeAliasTemplate* WalkTypeAliasTemplate(const clang::TypeAliasTemplateDecl* TD);
+    AST::ClassTemplate* WalkClassTemplate(const clang::ClassTemplateDecl* TD);
+    AST::FunctionTemplate* WalkFunctionTemplate(const clang::FunctionTemplateDecl* TD);
+    AST::VarTemplate* WalkVarTemplate(const clang::VarTemplateDecl* VT);
+    AST::VarTemplateSpecialization*
     WalkVarTemplateSpecialization(const clang::VarTemplateSpecializationDecl* VTS);
-    VarTemplatePartialSpecialization*
+    AST::VarTemplatePartialSpecialization*
     WalkVarTemplatePartialSpecialization(const clang::VarTemplatePartialSpecializationDecl* VTS);
     template<typename TypeLoc>
-    std::vector<TemplateArgument> WalkTemplateArgumentList(const clang::TemplateArgumentList* TAL, TypeLoc* TSTL);
-    std::vector<TemplateArgument> WalkTemplateArgumentList(const clang::TemplateArgumentList* TAL, const clang::ASTTemplateArgumentListInfo* TSTL);
-    void WalkVTable(const clang::CXXRecordDecl* RD, Class* C);
-    QualifiedType GetQualifiedType(clang::QualType qual, const clang::TypeLoc* TL = 0);
-    void ReadClassLayout(Class* Class, const clang::RecordDecl* RD, clang::CharUnits Offset, bool IncludeVirtualBases);
-    LayoutField WalkVTablePointer(Class* Class, const clang::CharUnits& Offset, const std::string& prefix);
-    VTableLayout WalkVTableLayout(const clang::VTableLayout& VTLayout);
-    VTableComponent WalkVTableComponent(const clang::VTableComponent& Component);
-    PreprocessedEntity* WalkPreprocessedEntity(Declaration* Decl,
+    std::vector<AST::TemplateArgument> WalkTemplateArgumentList(const clang::TemplateArgumentList* TAL, TypeLoc* TSTL);
+    std::vector<AST::TemplateArgument> WalkTemplateArgumentList(const clang::TemplateArgumentList* TAL, const clang::ASTTemplateArgumentListInfo* TSTL);
+    void WalkVTable(const clang::CXXRecordDecl* RD, AST::Class* C);
+    AST::QualifiedType GetQualifiedType(clang::QualType qual, const clang::TypeLoc* TL = 0);
+    void ReadClassLayout(AST::Class* Class, const clang::RecordDecl* RD, clang::CharUnits Offset, bool IncludeVirtualBases);
+    AST::LayoutField WalkVTablePointer(AST::Class* Class, const clang::CharUnits& Offset, const std::string& prefix);
+    AST::VTableLayout WalkVTableLayout(const clang::VTableLayout& VTLayout);
+    AST::VTableComponent WalkVTableComponent(const clang::VTableComponent& Component);
+    AST::PreprocessedEntity* WalkPreprocessedEntity(AST::Declaration* Decl,
         clang::PreprocessedEntity* PPEntity);
     AST::ExpressionObsolete* WalkVariableInitializerExpression(const clang::Expr* Expression);
     AST::ExpressionObsolete* WalkExpressionObsolete(const clang::Expr* Expression);
@@ -138,38 +139,38 @@ private:
     std::string GetTypeName(const clang::Type* Type) const;
     bool CanCheckCodeGenInfo(const clang::Type* Ty);
     void CompleteIfSpecializationType(const clang::QualType& QualType);
-    Parameter* WalkParameter(const clang::ParmVarDecl* PVD,
+    AST::Parameter* WalkParameter(const clang::ParmVarDecl* PVD,
         const clang::SourceLocation& ParamStartLoc);
-    void SetBody(const clang::FunctionDecl* FD, Function* F);
-    void MarkValidity(Function* F);
-    void WalkFunction(const clang::FunctionDecl* FD, Function* F);
+    void SetBody(const clang::FunctionDecl* FD, AST::Function* F);
+    void MarkValidity(AST::Function* F);
+    void WalkFunction(const clang::FunctionDecl* FD, AST::Function* F);
     int GetAlignAs(const clang::AlignedAttr* alignedAttr);
-    void HandlePreprocessedEntities(Declaration* Decl);
-    void HandlePreprocessedEntities(Declaration* Decl, clang::SourceRange sourceRange,
-                                    MacroLocation macroLocation = MacroLocation::Unknown);
+    void HandlePreprocessedEntities(AST::Declaration* Decl);
+    void HandlePreprocessedEntities(AST::Declaration* Decl, clang::SourceRange sourceRange,
+                                    AST::MacroLocation macroLocation = AST::MacroLocation::Unknown);
     bool GetDeclText(clang::SourceRange SR, std::string& Text);
     bool HasLayout(const clang::RecordDecl* Record);
 
-    TranslationUnit* GetTranslationUnit(clang::SourceLocation Loc,
+    AST::TranslationUnit* GetTranslationUnit(clang::SourceLocation Loc,
         SourceLocationKind *Kind = 0);
-    TranslationUnit* GetTranslationUnit(const clang::Decl* D);
+    AST::TranslationUnit* GetTranslationUnit(const clang::Decl* D);
 
-    DeclarationContext* GetNamespace(const clang::Decl* D, const clang::DeclContext* Ctx);
-    DeclarationContext* GetNamespace(const clang::Decl* D);
+    AST::DeclarationContext* GetNamespace(const clang::Decl* D, const clang::DeclContext* Ctx);
+    AST::DeclarationContext* GetNamespace(const clang::Decl* D);
 
-    void HandleOriginalText(const clang::Decl* D, Declaration* Decl);
-    void HandleComments(const clang::Decl* D, Declaration* Decl);
+    void HandleOriginalText(const clang::Decl* D, AST::Declaration* Decl);
+    void HandleComments(const clang::Decl* D, AST::Declaration* Decl);
     void HandleDiagnostics(ParserResult* res);
 
     ParserResultKind ReadSymbols(llvm::StringRef File,
                                  llvm::object::basic_symbol_iterator Begin,
                                  llvm::object::basic_symbol_iterator End,
-                                 CppSharp::CppParser::NativeLibrary*& NativeLib);
-    Declaration* GetDeclarationFromFriend(clang::NamedDecl* FriendDecl);
+                                 AST::NativeLibrary*& NativeLib);
+    AST::Declaration* GetDeclarationFromFriend(clang::NamedDecl* FriendDecl);
     static ParserResultKind ParseArchive(const std::string& File,
-        llvm::object::Archive* Archive, std::vector<CppSharp::CppParser::NativeLibrary*>& NativeLibs);
+        llvm::object::Archive* Archive, std::vector<AST::NativeLibrary*>& NativeLibs);
     static ParserResultKind ParseSharedLib(const std::string& File,
-        llvm::object::ObjectFile* ObjectFile, std::vector<CppSharp::CppParser::NativeLibrary*>& NativeLibs);
+        llvm::object::ObjectFile* ObjectFile, std::vector<AST::NativeLibrary*>& NativeLibs);
     ParserTargetInfo* GetTargetInfo();
 
     bool LinkWindows(const CppLinkerOptions* LinkerOptions, std::vector<const char*>& args,
@@ -179,17 +180,17 @@ private:
     bool LinkMachO(const CppLinkerOptions* LinkerOptions, std::vector<const char*>& args,
         llvm::StringRef& Dir, llvm::StringRef& Stem);
 
-    int index;
+    int index = 0;
     std::unique_ptr<clang::CompilerInstance> c;
     llvm::LLVMContext LLVMCtx;
     std::unique_ptr<ASTNameMangler> NameMangler;
     std::unique_ptr<llvm::Module> LLVMModule;
     std::unique_ptr<clang::CodeGen::CodeGenModule> CGM;
     std::unique_ptr<clang::CodeGen::CodeGenTypes> codeGenTypes;
-    std::unordered_map<const clang::TemplateTypeParmDecl*, TypeTemplateParameter*> walkedTypeTemplateParameters;
-    std::unordered_map<const clang::TemplateTemplateParmDecl*, TemplateTemplateParameter*> walkedTemplateTemplateParameters;
-    std::unordered_map<const clang::NonTypeTemplateParmDecl*, NonTypeTemplateParameter*> walkedNonTypeTemplateParameters;
-    std::unordered_map<const clang::ParmVarDecl*, Parameter*> walkedParameters;
+    std::unordered_map<const clang::TemplateTypeParmDecl*, AST::TypeTemplateParameter*> walkedTypeTemplateParameters;
+    std::unordered_map<const clang::TemplateTemplateParmDecl*, AST::TemplateTemplateParameter*> walkedTemplateTemplateParameters;
+    std::unordered_map<const clang::NonTypeTemplateParmDecl*, AST::NonTypeTemplateParameter*> walkedNonTypeTemplateParameters;
+    std::unordered_map<const clang::ParmVarDecl*, AST::Parameter*> walkedParameters;
     std::unordered_set<std::string> supportedStdTypes;
     std::unordered_set<std::string> supportedFunctionTemplates;
 };

src/Generator/Generators/CLI/CLITypeReferences.cs

@@ -30,7 +30,7 @@ namespace CppSharp.Generators.CLI
         private readonly DriverOptions DriverOptions;
         private TranslationUnit TranslationUnit;
 
-        private Dictionary<Declaration, CLITypeReference> typeReferences;
+        private readonly Dictionary<Declaration, CLITypeReference> typeReferences;
         public IEnumerable<CLITypeReference> TypeReferences => typeReferences.Values;
 
         public HashSet<Declaration> GeneratedDeclarations;
@@ -45,28 +45,29 @@ namespace CppSharp.Generators.CLI
 
         public CLITypeReference GetTypeReference(Declaration decl)
         {
-            if (typeReferences.ContainsKey(decl))
-                return typeReferences[decl];
+            if (typeReferences.TryGetValue(decl, out CLITypeReference reference))
+                return reference;
 
             var translationUnit = decl.Namespace.TranslationUnit;
 
-            if (ShouldIncludeTranslationUnit(translationUnit) && decl.IsGenerated && !IsBuiltinTypedef(decl))
-            {
-                var @ref = new CLITypeReference { Declaration = decl };
+            if (!ShouldIncludeTranslationUnit(translationUnit) || !decl.IsGenerated || IsBuiltinTypedef(decl))
+                return null;
 
-                @ref.Include = new CInclude
+            var @ref = new CLITypeReference
+            {
+                Declaration = decl,
+                Include = new CInclude
                 {
                     File = DriverOptions.GetIncludePath(translationUnit),
                     TranslationUnit = translationUnit,
                     Kind = translationUnit.IsGenerated ? CInclude.IncludeKind.Quoted : CInclude.IncludeKind.Angled
+                }
             };
 
             typeReferences.Add(decl, @ref);
 
             return @ref;
-            }
 
-            return null;
         }
 
         static Namespace GetEffectiveNamespace(Declaration decl)
@@ -145,15 +146,16 @@ namespace CppSharp.Generators.CLI
 
         private bool IsBuiltinTypedef(Declaration decl)
         {
-            var typedefDecl = decl as TypedefDecl;
-            if (typedefDecl == null) return false;
-            if (typedefDecl.Type is BuiltinType) return true;
+            if (decl is not TypedefDecl typedefDecl)
+                return false;
 
-            var typedefType = typedefDecl.Type as TypedefType;
-            if (typedefType == null) return false;
-            if (typedefType.Declaration == null) return false;
+            if (typedefDecl.Type is BuiltinType)
+                return true;
+
+            if (typedefDecl.Type is not TypedefType typedefType)
+                return false;
 
-            return typedefType.Declaration.Type is BuiltinType;
+            return typedefType.Declaration?.Type is BuiltinType;
         }
 
         public bool IsIncludeInHeader(ASTRecord<Declaration> record)

src/Generator/Generators/CSharp/CSharpSources.cs

@@ -1163,8 +1163,7 @@ internal static bool {Helpers.TryGetNativeToManagedMappingIdentifier}(IntPtr nat
             }
             else
             {
-                Class @class;
-                if (type.TryGetClass(out @class) && @class.HasNonTrivialCopyConstructor)
+                if (type.TryGetClass(out Class @class) && @class.HasNonTrivialCopyConstructor)
                 {
                     Method cctor = @class.Methods.First(c => c.IsCopyConstructor);
                     WriteLine($@"{TypePrinter.PrintNative(type)}.{GetFunctionNativeIdentifier(cctor)}({call}, {marshal.Context.Return});");
@@ -3513,10 +3512,10 @@ internal static{(@new ? " new" : string.Empty)} {printedClass} __GetInstance({Ty
                 var method = function as Method;
                 if (method != null)
                 {
-                    if (method.IsConstructor && !method.IsCopyConstructor)
-                        identifier.Append("ctor");
-                    else if (method.IsCopyConstructor)
+                    if (method.IsCopyConstructor)
                         identifier.Append("cctor");
+                    else if (method.IsConstructor)
+                        identifier.Append("ctor");
                     else if (method.IsDestructor)
                         identifier.Append("dtor");
                     else

src/Generator/Passes/FindSymbolsPass.cs

@@ -87,7 +87,7 @@ namespace CppSharp.Passes
         {
             if (!Context.Symbols.FindLibraryBySymbol(mangledDecl.Mangled, out _))
             {
-                if (mangledDecl is Variable variable && variable.IsConstExpr)
+                if (mangledDecl is Variable { IsConstExpr: true })
                     return true;
 
                 Diagnostics.Warning("Symbol not found: {0}", mangledDecl.Mangled);

src/Generator/Passes/GenerateSymbolsPass.cs

@@ -19,9 +19,12 @@ namespace CppSharp.Passes
         {
             var result = base.VisitASTContext(context);
             var findSymbolsPass = Context.TranslationUnitPasses.FindPass<FindSymbolsPass>();
+            
             GenerateSymbols();
-            if (remainingCompilationTasks > 0)
+
+            if (RemainingCompilationTasks > 0)
                 findSymbolsPass.Wait = true;
+
             return result;
         }
 
@@ -30,7 +33,8 @@ namespace CppSharp.Passes
         private void GenerateSymbols()
         {
             var modules = Options.Modules.Where(symbolsCodeGenerators.ContainsKey).ToList();
-            remainingCompilationTasks = modules.Count;
+            RemainingCompilationTasks = modules.Count;
+
             foreach (var module in modules)
             {
                 var symbolsCodeGenerator = symbolsCodeGenerators[module];
@@ -53,21 +57,26 @@ namespace CppSharp.Passes
                     // if the user's provided no libraries, he only wants to generate code
                     (module.LibraryDirs.Count > 0 && module.Libraries.Count > 0)))
                 {
-                    using (var linkerOptions = new LinkerOptions(Context.LinkerOptions))
+                    using var linkerOptions = new LinkerOptions(Context.LinkerOptions);
+
+                    foreach (var libraryDir in module.Dependencies
+                                 .Union(new[] { module })
+                                 .SelectMany(d => d.LibraryDirs))
                     {
-                        foreach (var libraryDir in module.Dependencies.Union(
-                            new[] { module }).SelectMany(d => d.LibraryDirs))
                         linkerOptions.AddLibraryDirs(libraryDir);
+                    }
 
-                        foreach (var library in module.Dependencies.Union(
-                            new[] { module }).SelectMany(d => d.Libraries))
+                    foreach (var library in module.Dependencies
+                                 .Union(new[] { module })
+                                 .SelectMany(d => d.Libraries))
+                    {
                         linkerOptions.AddLibraries(library);
+                    }
 
                     compiledLibraries[module] = Build(linkerOptions, path, module);
                 }
-                }
 
-                RemainingCompilationTasks--;
+                --RemainingCompilationTasks;
             }
         }
 
@@ -79,7 +88,7 @@ namespace CppSharp.Passes
                 linkerOptions.Setup(Context.ParserOptions.TargetTriple, Context.ParserOptions.LanguageVersion);
                 using var result = Parser.ClangParser.Build(
                     Context.ParserOptions, linkerOptions, path,
-                    Last: remainingCompilationTasks == 1);
+                    Last: RemainingCompilationTasks == 1);
 
                 if (!PrintDiagnostics(result))
                     return null;
@@ -120,7 +129,7 @@ namespace CppSharp.Passes
                 }
                 else
                 {
-                    Diagnostics.Message($"Linking success.");
+                    Diagnostics.Message("Linking success.");
                 }
             }
 
@@ -180,7 +189,7 @@ namespace CppSharp.Passes
         public override bool VisitVariableDecl(Variable variable)
         {
             if (!base.VisitVariableDecl(variable) ||
-                !(variable.Namespace is ClassTemplateSpecialization specialization) ||
+                variable.Namespace is not ClassTemplateSpecialization specialization ||
                 specialization.SpecializationKind == TemplateSpecializationKind.ExplicitSpecialization)
                 return false;
 
@@ -227,8 +236,8 @@ namespace CppSharp.Passes
 
         private SymbolsCodeGenerator GetSymbolsCodeGenerator(Module module)
         {
-            if (symbolsCodeGenerators.ContainsKey(module))
-                return symbolsCodeGenerators[module];
+            if (symbolsCodeGenerators.TryGetValue(module, out SymbolsCodeGenerator generator))
+                return generator;
 
             var symbolsCodeGenerator = new SymbolsCodeGenerator(Context, module.Units);
             symbolsCodeGenerators[module] = symbolsCodeGenerator;
@@ -277,9 +286,7 @@ namespace CppSharp.Passes
         {
             new Thread(() =>
                 {
-                    int error;
-                    string errorMessage;
-                    ProcessHelper.Run(compiler, arguments, out error, out errorMessage);
+                    ProcessHelper.Run(compiler, arguments, out _, out var errorMessage);
                     var output = GetOutputFile(module.SymbolsLibraryName);
                     if (!File.Exists(Path.Combine(outputDir, output)))
                         Diagnostics.Error(errorMessage);
@@ -294,8 +301,7 @@ namespace CppSharp.Passes
         {
             foreach (var @base in @class.Bases.Where(b => b.IsClass))
             {
-                var specialization = @base.Class as ClassTemplateSpecialization;
-                if (specialization != null && !specialization.IsExplicitlyGenerated &&
+                if (@base.Class is ClassTemplateSpecialization { IsExplicitlyGenerated: false } specialization &&
                     specialization.SpecializationKind != TemplateSpecializationKind.ExplicitSpecialization)
                     ASTUtils.CheckTypeForSpecialization(@base.Type, @class, Add, Context.TypeMaps);
                 CheckBasesForSpecialization(@base.Class);
@@ -304,30 +310,34 @@ namespace CppSharp.Passes
 
         private void Add(ClassTemplateSpecialization specialization)
         {
-            ICollection<ClassTemplateSpecialization> specs;
-            if (specializations.ContainsKey(specialization.TranslationUnit.Module))
-                specs = specializations[specialization.TranslationUnit.Module];
-            else specs = specializations[specialization.TranslationUnit.Module] =
-                new HashSet<ClassTemplateSpecialization>();
-            if (!specs.Contains(specialization))
+            if (!specializations.TryGetValue(specialization.TranslationUnit.Module, out var specs))
+            {
+                specs = new HashSet<ClassTemplateSpecialization>();
+                specializations[specialization.TranslationUnit.Module] = specs;
+            }
+
+            if (specs.Add(specialization))
             {
-                specs.Add(specialization);
                 foreach (Method method in specialization.Methods)
                     method.Visit(this);
             }
+
             GetSymbolsCodeGenerator(specialization.TranslationUnit.Module);
         }
 
+        private int _remainingCompilationTasks;
         private int RemainingCompilationTasks
         {
-            get { return remainingCompilationTasks; }
+            get => _remainingCompilationTasks;
             set
             {
-                if (remainingCompilationTasks != value)
-                {
-                    remainingCompilationTasks = value;
-                    if (remainingCompilationTasks == 0)
-                    {
+                if (_remainingCompilationTasks == value) 
+                    return;
+
+                _remainingCompilationTasks = value;
+                if (_remainingCompilationTasks != 0) 
+                    return;
+
                 foreach (var module in Context.Options.Modules.Where(compiledLibraries.ContainsKey))
                 {
                     CompiledLibrary compiledLibrary = compiledLibraries[module];
@@ -337,56 +347,65 @@ namespace CppSharp.Passes
                 findSymbolsPass.Wait = false;
             }
         }
-            }
-        }
 
         private void CollectSymbols(string outputDir, string library)
         {
-            using (var linkerOptions = new LinkerOptions(Context.LinkerOptions))
-            {
+            using var linkerOptions = new LinkerOptions(Context.LinkerOptions);
             linkerOptions.AddLibraryDirs(outputDir);
             var output = GetOutputFile(library);
             linkerOptions.AddLibraries(output);
-                using (var parserResult = Parser.ClangParser.ParseLibrary(linkerOptions))
-                {
-                    if (parserResult.Kind == ParserResultKind.Success)
+
+            using var parserResult = Parser.ClangParser.ParseLibrary(linkerOptions);
+            if (parserResult.Kind != ParserResultKind.Success)
             {
-                        lock (@lock)
+                Diagnostics.Error($"Parsing of {Path.Combine(outputDir, output)} failed.");
+                return;
+            }
+
+            var results = GetLibraries(parserResult).AsParallel()
+                .Select(ClangParser.ConvertLibrary);
+
+            lock (symbolsLock)
             {
-                            for (uint i = 0; i < parserResult.LibrariesCount; i++)
+                foreach (var nativeLibrary in results)
                 {
-                                var nativeLibrary = ClangParser.ConvertLibrary(parserResult.GetLibraries(i));
                     Context.Symbols.Libraries.Add(nativeLibrary);
                     Context.Symbols.IndexSymbols();
                 }
             }
-                    }
-                    else
-                        Diagnostics.Error($"Parsing of {Path.Combine(outputDir, output)} failed.");
-                }
+
+            return;
+
+            IEnumerable<Parser.AST.NativeLibrary> GetLibraries(ParserResult p)
+            {
+                for (uint i = 0; i < p.LibrariesCount; i++)
+                    yield return p.GetLibraries(i);
             }
         }
 
         private static string GetOutputFile(string library)
         {
-            return Path.GetFileName($@"{(Platform.IsWindows ?
-                string.Empty : "lib")}{library}.{
-                (Platform.IsMacOS ? "dylib" : Platform.IsWindows ? "dll" : "so")}");
+            var extension = Platform.Host switch
+            {
+                TargetPlatform.Windows => "lib",
+                TargetPlatform.Linux => "so",
+                TargetPlatform.MacOS => "dylib",
+                _ => throw new NotImplementedException()
+            };
+
+            return Path.GetFileName($"{(Platform.IsWindows ? string.Empty : "lib")}{library}.{extension}");
         }
 
-        private int remainingCompilationTasks;
-        private static readonly object @lock = new object();
+        private static readonly object symbolsLock = new();
 
-        private Dictionary<Module, SymbolsCodeGenerator> symbolsCodeGenerators =
-            new Dictionary<Module, SymbolsCodeGenerator>();
-        private Dictionary<Module, HashSet<ClassTemplateSpecialization>> specializations =
-            new Dictionary<Module, HashSet<ClassTemplateSpecialization>>();
-        private Dictionary<Module, CompiledLibrary> compiledLibraries = new Dictionary<Module, CompiledLibrary>();
+        private readonly Dictionary<Module, SymbolsCodeGenerator> symbolsCodeGenerators = new();
+        private readonly Dictionary<Module, HashSet<ClassTemplateSpecialization>> specializations = new();
+        private readonly Dictionary<Module, CompiledLibrary> compiledLibraries = new();
 
         private class CompiledLibrary
         {
-            public string OutputDir { get; set; }
-            public string Library { get; set; }
+            public string OutputDir { get; init; }
+            public string Library { get; init; }
         }
     }
 }

src/Generator/Passes/StripUnusedSystemTypesPass.cs

@@ -15,9 +15,15 @@ namespace CppSharp.Passes
         {
             // we need this one for marshalling std::string
             foreach (var name in new[] { "allocator", "char_traits" })
-                foreach (var usedStdType in context.FindClass(name, false, true).Where(
-                    a => a.TranslationUnit.IsSystemHeader))
+            {
+                var forceIncludedClasses = context.FindClass(name, false, true)
+                    .Where(a => a.TranslationUnit.IsSystemHeader);
+
+                foreach (var usedStdType in forceIncludedClasses)
+                {
                     usedStdTypes.Add(usedStdType);
+                }
+            }
 
             var result = base.VisitASTContext(context);
 
@@ -44,8 +50,7 @@ namespace CppSharp.Passes
             var tagType = desugared as TagType ?? templateType?.Desugared.Type as TagType;
             if (tagType != null)
             {
-                var specialization = tagType.Declaration as ClassTemplateSpecialization;
-                if (specialization != null)
+                if (tagType.Declaration is ClassTemplateSpecialization specialization)
                 {
                     MarkAsUsed(specialization.TemplatedDecl);
                     MarkAsUsed(specialization.TemplatedDecl.TemplatedDecl);
@@ -57,8 +62,9 @@ namespace CppSharp.Passes
                 return true;
             }
 
-            if (templateType != null)
-            {
+            if (templateType == null)
+                return false;
+
             var template = templateType.Template;
             if (template.TemplatedDecl is TypeAlias typeAlias &&
                 typeAlias.Type.Desugar() is TemplateSpecializationType specializationType)
@@ -70,14 +76,12 @@ namespace CppSharp.Passes
             MarkAsUsed(template);
             MarkAsUsed(template.TemplatedDecl);
             return true;
-            }
 
-            return false;
         }
 
         private void MarkAsUsed(Declaration declaration)
         {
-            while (declaration != null && !(declaration is Namespace))
+            while (declaration != null && declaration is not Namespace)
             {
                 usedStdTypes.Add(declaration);
                 declaration = declaration.Namespace;
@@ -89,15 +93,18 @@ namespace CppSharp.Passes
             for (int i = context.Declarations.Count - 1; i >= 0; i--)
             {
                 var declaration = context.Declarations[i];
-                var nestedContext = declaration as Namespace;
-                if (nestedContext != null)
+
+                if (declaration is Namespace nestedContext)
+                {
                     RemoveUnusedStdTypes(nestedContext);
-                else if (!this.usedStdTypes.Contains(declaration) &&
-                    !declaration.IsExplicitlyGenerated)
+                    continue;
+                }
+
+                if (!usedStdTypes.Contains(declaration) && !declaration.IsExplicitlyGenerated)
                     context.Declarations.RemoveAt(i);
             }
         }
 
-        private readonly HashSet<Declaration> usedStdTypes = new HashSet<Declaration>();
+        private readonly HashSet<Declaration> usedStdTypes = new();
     }
 }

src/Parser/ParserOptions.cs

@@ -84,10 +84,9 @@ namespace CppSharp.Parser
                 TargetTriple.Contains("windows") || TargetTriple.Contains("msvc");
 
         public bool EnableRTTI { get; set; }
-        public LanguageVersion? LanguageVersion { get; set; }
+        public LanguageVersion LanguageVersion { get; set; } = CppSharp.Parser.LanguageVersion.CPP14_GNU;
 
-        public void BuildForSourceFile(
-                IEnumerable<CppSharp.AST.Module> modules, string file = null)
+        public void BuildForSourceFile(IEnumerable<CppSharp.AST.Module> modules, string file = null)
         {
             // This eventually gets passed to Clang's MSCompatibilityVersion, which
             // is in turn used to derive the value of the built-in define _MSC_VER.
@@ -158,10 +157,6 @@ namespace CppSharp.Parser
             var clVersion = MSVCToolchain.GetCLVersion(vsVersion);
             ToolSetToUse = clVersion.Major * 10000000 + clVersion.Minor * 100000;
             
-            // do not remove the CppSharp prefix becase the Mono C# compiler breaks
-            if (!LanguageVersion.HasValue)
-                LanguageVersion = CppSharp.Parser.LanguageVersion.CPP14_GNU;
-
             AddArguments("-fms-extensions");
             AddArguments("-fms-compatibility");
             AddArguments("-fdelayed-template-parsing");
@@ -297,8 +292,6 @@ namespace CppSharp.Parser
 
         private void SetupArguments(TargetPlatform targetPlatform)
         {
-            LanguageVersion ??= CppSharp.Parser.LanguageVersion.CPP14_GNU;
-
             // As of Clang revision 5e866e411caa we are required to pass "-fgnuc-version="
             // to get the __GNUC__ symbol defined. macOS and Linux system headers require
             // this define, so we need explicitly pass it to Clang.

tests/dotnet/Common/Common.h

@@ -121,9 +121,9 @@ struct DLL_API Bar
     explicit Bar(const Foo* foo);
     Bar(Foo foo);
     Item RetItem1() const;
-    int A;
-    float B;
-    Item fixedEnumArray[3];
+    int A = -1;
+    float B = -1.0f;
+    Item fixedEnumArray[3]{};
 
     Bar* returnPointerToValueType();