Hid most internal details of the generated code from users.

src/AST/Module.cs

@@ -4,28 +4,16 @@ namespace CppSharp.AST
 {
     public class Module
     {
-        public Module()
-        {
-            IncludeDirs = new List<string>();
-            Headers = new List<string>();
-            LibraryDirs = new List<string>();
-            Libraries = new List<string>();
-            Defines = new List<string>();
-            Undefines = new List<string>();
-            Units = new List<TranslationUnit>();
-            CodeFiles = new List<string>();
-        }
-
-        public List<string> IncludeDirs { get; private set; }
-        public List<string> Headers { get; private set; }
-        public List<string> LibraryDirs { get; set; }
-        public List<string> Libraries { get; private set; }
-        public List<string> Defines { get; set; }
-        public List<string> Undefines { get; set; }
+        public List<string> IncludeDirs { get; } = new List<string>();
+        public List<string> Headers { get; } = new List<string>();
+        public List<string> LibraryDirs { get; } = new List<string>();
+        public List<string> Libraries { get; } = new List<string>();
+        public List<string> Defines { get; } = new List<string>();
+        public List<string> Undefines { get; } = new List<string>();
         public string OutputNamespace { get; set; }
-
-        public List<TranslationUnit> Units { get; private set; }
-        public List<string> CodeFiles { get; private set; }
+        public List<TranslationUnit> Units { get; } = new List<TranslationUnit>();
+        public List<string> CodeFiles { get; } = new List<string>();
+        public List<Module> Dependencies { get; } = new List<Module>();
 
         public string SharedLibraryName
         {
@@ -74,6 +62,8 @@ namespace CppSharp.AST
 
         public string LibraryName { get; set; }
 
+        public override string ToString() => LibraryName;
+
         private string sharedLibraryName;
         private string inlinesLibraryName;
         private string templatesLibraryName;

src/Generator/Driver.cs

@@ -223,20 +223,24 @@ namespace CppSharp
 
         public void SortModulesByDependencies()
         {
-            if (Options.Modules.All(m => m.Libraries.Any() || m == Options.SystemModule))
-            {
+            if (!Options.DoAllModulesHaveLibraries())
+                return;
+
             var sortedModules = Options.Modules.TopologicalSort(m =>
             {
-                    return from library in Context.Symbols.Libraries
+                var dependencies = (from library in Context.Symbols.Libraries
                                     where m.Libraries.Contains(library.FileName)
                                     from module in Options.Modules
                                     where library.Dependencies.Intersect(module.Libraries).Any()
-                           select module;
+                                    select module).ToList();
+                if (m != Options.SystemModule)
+                    m.Dependencies.Add(Options.SystemModule);
+                m.Dependencies.AddRange(dependencies);
+                return dependencies;
             });
             Options.Modules.Clear();
             Options.Modules.AddRange(sortedModules);
         }
-        }
 
         public bool ParseLibraries()
         {
@@ -384,9 +388,7 @@ namespace CppSharp
 
         public void CompileCode(AST.Module module)
         {
-            var assemblyFile = Path.Combine(Options.OutputDir,
-                string.IsNullOrEmpty(module.LibraryName) ?
-                    "out.dll" : module.LibraryName + ".dll");
+            var assemblyFile = Path.Combine(Options.OutputDir, module.LibraryName + ".dll");
 
             var docFile = Path.ChangeExtension(assemblyFile, ".xml");
 
@@ -421,7 +423,7 @@ namespace CppSharp
                          !compilerParameters.ReferencedAssemblies.Contains(libraryMappings[d]))
                     .Select(l => libraryMappings[l])).ToArray());
 
-            Diagnostics.Message("Compiling {0}...", module.LibraryName);
+            Diagnostics.Message($"Compiling {module.LibraryName}...");
             CompilerResults compilerResults;
             using (var codeProvider = new CSharpCodeProvider(
                 new Dictionary<string, string> {
@@ -439,6 +441,23 @@ namespace CppSharp
 
             HasCompilationErrors = errors.Count > 0;
             if (!HasCompilationErrors)
+            {
+                InjectModuleInitializer(assemblyFile);
+                Diagnostics.Message("Compilation succeeded.");
+                var wrapper = Path.Combine(outputDir, assemblyFile);
+                foreach (var library in module.Libraries)
+                    libraryMappings[library] = wrapper;
+            }
+        }
+
+        /// <summary>
+        /// Injects a module initializer, if any, i.e. code executed right after an
+        /// assembly is loaded and before any other code in it.
+        /// <para>The run-time supports it but C# does not so we inject it in the
+        /// compiled assembly by manually adding IL instructions.</para>
+        /// </summary>
+        /// <param name="assemblyFile">The assembly to inject a module initializer to.</param>
+        private static void InjectModuleInitializer(string assemblyFile)
         {
             var injector = new Injector();
             injector.ReadAssembly(assemblyFile);
@@ -448,11 +467,6 @@ namespace CppSharp
                 injector.InjectInitializer(moduleInitializer);
                 injector.WriteAssembly(assemblyFile, null);
             }
-                Diagnostics.Message("Compilation succeeded.");
-                var wrapper = Path.Combine(outputDir, assemblyFile);
-                foreach (var library in module.Libraries)
-                    libraryMappings[library] = wrapper;
-            }
         }
 
         public void AddTranslationUnitPass(TranslationUnitPass pass)

src/Generator/Generators/CSharp/CSharpSources.cs

@@ -157,6 +157,8 @@ namespace CppSharp.Generators.CSharp
             WriteLine("using System;");
             WriteLine("using System.Runtime.InteropServices;");
             WriteLine("using System.Security;");
+            if (Context.Options.DoAllModulesHaveLibraries())
+                WriteLine("using System.Runtime.CompilerServices;");
             foreach (var customUsingStatement in Options.DependentNameSpaces)
             {
                 WriteLine(string.Format("using {0};", customUsingStatement));
@@ -165,6 +167,21 @@ namespace CppSharp.Generators.CSharp
 
             var module = TranslationUnits.Count == 0 ?
                 Context.Options.SystemModule : TranslationUnit.Module;
+            var hasInternalsVisibleTo = false;
+            if (Context.Options.DoAllModulesHaveLibraries())
+            {
+                foreach (var library in from m in Options.Modules
+                                        where m.Dependencies.Contains(module)
+                                        select m.LibraryName)
+                {
+                    WriteLine($"[assembly:InternalsVisibleTo(\"{library}\")]");
+                    if (!hasInternalsVisibleTo)
+                        hasInternalsVisibleTo = true;
+                }
+            }
+            if (hasInternalsVisibleTo)
+                NewLine();
+
             if (!string.IsNullOrEmpty(module.OutputNamespace))
             {
                 PushBlock(CSharpBlockKind.Namespace);
@@ -471,7 +488,7 @@ namespace CppSharp.Generators.CSharp
                     {
                         WriteLine("private {0}.{1} {2};", @class.Name, Helpers.InternalStruct,
                             Helpers.InstanceField);
-                        WriteLine("public {0}.{1} {2} {{ get {{ return {3}; }} }}", @class.Name,
+                        WriteLine("internal {0}.{1} {2} {{ get {{ return {3}; }} }}", @class.Name,
                             Helpers.InternalStruct, Helpers.InstanceIdentifier, Helpers.InstanceField);
                     }
                     else
@@ -488,7 +505,7 @@ namespace CppSharp.Generators.CSharp
                         // use interfaces if any - derived types with a secondary base this class must be compatible with the map
                         var @interface = @class.Namespace.Classes.Find(c => c.OriginalClass == @class);
                         WriteLine(
-                            "public static readonly System.Collections.Concurrent.ConcurrentDictionary<IntPtr, {0}> NativeToManagedMap = new System.Collections.Concurrent.ConcurrentDictionary<IntPtr, {0}>();",
+                            "internal static readonly System.Collections.Concurrent.ConcurrentDictionary<IntPtr, {0}> NativeToManagedMap = new System.Collections.Concurrent.ConcurrentDictionary<IntPtr, {0}>();",
                             @interface != null ? @interface.Name : @class.Name);
                         WriteLine("protected void*[] __OriginalVTables;");
                     }
@@ -2008,7 +2025,7 @@ namespace CppSharp.Generators.CSharp
             if (!@class.IsAbstractImpl)
             {
                 PushBlock(CSharpBlockKind.Method);
-                WriteLine("public static {0}{1} {2}(global::System.IntPtr native, bool skipVTables = false)",
+                WriteLine("internal static {0}{1} {2}(global::System.IntPtr native, bool skipVTables = false)",
                     @class.NeedsBase && !@class.BaseClass.IsInterface ? "new " : string.Empty,
                     @class.Name, Helpers.CreateInstanceIdentifier);
                 WriteStartBraceIndent();
@@ -2080,7 +2097,7 @@ namespace CppSharp.Generators.CSharp
             if (!@class.IsAbstractImpl)
             {
                 PushBlock(CSharpBlockKind.Method);
-                WriteLine("public static {0} {1}({0}.{2}{3} native, bool skipVTables = false)",
+                WriteLine("internal static {0} {1}({0}.{2}{3} native, bool skipVTables = false)",
                     className, Helpers.CreateInstanceIdentifier,
                     Helpers.InternalStruct, internalSuffix);
                 WriteStartBraceIndent();

src/Generator/Options.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using System.Linq;
 using System.Text;
 using CppSharp.AST;
 using CppSharp.Generators;
@@ -39,8 +40,8 @@ namespace CppSharp
         /// </summary>
         public bool DryRun;
 
-        public Module SystemModule { get; private set; }
-        public List<Module> Modules { get; private set; }
+        public Module SystemModule { get; }
+        public List<Module> Modules { get; }
 
         public Module MainModule
         {
@@ -53,11 +54,11 @@ namespace CppSharp
         }
 
         // Parser options
-        public List<string> Headers { get { return MainModule.Headers; } }
+        public List<string> Headers => MainModule.Headers;
         public bool IgnoreParseWarnings;
 
         // Library options
-        public List<string> Libraries { get { return MainModule.Libraries; } }
+        public List<string> Libraries => MainModule.Libraries;
         public bool CheckSymbols;
 
         public string SharedLibraryName
@@ -133,15 +134,9 @@ namespace CppSharp
             set { MainModule.TemplatesLibraryName = value; }
         }
 
-        public bool IsCSharpGenerator
-        {
-            get { return GeneratorKind == GeneratorKind.CSharp; }
-        }
+        public bool IsCSharpGenerator => GeneratorKind == GeneratorKind.CSharp;
 
-        public bool IsCLIGenerator
-        {
-            get { return GeneratorKind == GeneratorKind.CLI; }
-        }
+        public bool IsCLIGenerator => GeneratorKind == GeneratorKind.CLI;
 
         public readonly List<string> DependentNameSpaces = new List<string>();
         public bool MarshalCharAsManagedChar { get; set; }
@@ -156,7 +151,10 @@ namespace CppSharp
         /// <summary>
         /// C# end only: force patching of the virtual entries of the functions in this list.
         /// </summary>
-        public HashSet<string> ExplicitlyPatchedVirtualFunctions { get; private set; }
+        public HashSet<string> ExplicitlyPatchedVirtualFunctions { get; }
+
+        public bool DoAllModulesHaveLibraries() =>
+            Modules.All(m => m == SystemModule || m.Libraries.Count > 0);
     }
 
     public class InvalidOptionException : Exception

src/Generator/Passes/CheckIgnoredDecls.cs

@@ -347,7 +347,7 @@ namespace CppSharp.Passes
                 return true;
             }
 
-            if (Options.Modules.All(m => m == Options.SystemModule || m.Libraries.Count > 0) &&
+            if (Options.DoAllModulesHaveLibraries() &&
                 module != Options.SystemModule && IsTypeExternal(module, type))
             {
                 msg = "external";
@@ -410,16 +410,7 @@ namespace CppSharp.Passes
             if (declaration.Namespace == null || declaration.TranslationUnit.Module == null)
                 return false;
 
-            // Check if there’s another module which wraps libraries with dependencies on
-            // the ones in the current module.
-            if (declaration.TranslationUnit.Module.Libraries.Any(l =>
-                    Context.Symbols.Libraries.First(
-                        lib => lib.FileName == l).Dependencies.Any(
-                            d => module != declaration.TranslationUnit.Module &&
-                                module.Libraries.Contains(d))))
-                return true;
-
-            return false;
+            return declaration.TranslationUnit.Module.Dependencies.Contains(module);
         }
 
         private bool IsTypeIgnored(Type type)

src/Generator/Passes/DelegatesPass.cs

@@ -122,7 +122,8 @@ namespace CppSharp.Passes
                                     ReturnType = method.ReturnType
                                 }))),
                     Namespace = namespaceDelegates,
-                    IsSynthetized = true
+                    IsSynthetized = true,
+                    Access = AccessSpecifier.Private
                 };
 
             Generator.CurrentOutputNamespace = module.OutputNamespace;

tests/CSharp/CSharp.Tests.cs

@@ -320,17 +320,23 @@ public unsafe class CSharpTests : GeneratorTestFixture
     {
         IntPtr native1;
         IntPtr native2;
+        var hasVirtualDtor1Map = (IDictionary<IntPtr, HasVirtualDtor1>) typeof(
+            HasVirtualDtor1).GetField("NativeToManagedMap",
+            BindingFlags.Static | BindingFlags.NonPublic).GetValue(null);
+        var hasVirtualDtor2Map = (IDictionary<IntPtr, HasVirtualDtor2>) typeof(
+            HasVirtualDtor2).GetField("NativeToManagedMap",
+            BindingFlags.Static | BindingFlags.NonPublic).GetValue(null);
         using (var testNativeToManagedMap = new TestNativeToManagedMap())
         {
             var hasVirtualDtor2 = testNativeToManagedMap.HasVirtualDtor2;
             native2 = hasVirtualDtor2.__Instance;
             native1 = hasVirtualDtor2.HasVirtualDtor1.__Instance;
-            Assert.IsTrue(HasVirtualDtor2.NativeToManagedMap.ContainsKey(native2));
-            Assert.IsTrue(HasVirtualDtor1.NativeToManagedMap.ContainsKey(native1));
+            Assert.IsTrue(hasVirtualDtor1Map.ContainsKey(native1));
+            Assert.IsTrue(hasVirtualDtor2Map.ContainsKey(native2));
             Assert.AreSame(hasVirtualDtor2, testNativeToManagedMap.HasVirtualDtor2);
         }
-        Assert.IsFalse(HasVirtualDtor2.NativeToManagedMap.ContainsKey(native2));
-        Assert.IsFalse(HasVirtualDtor1.NativeToManagedMap.ContainsKey(native1));
+        Assert.IsFalse(hasVirtualDtor1Map.ContainsKey(native1));
+        Assert.IsFalse(hasVirtualDtor2Map.ContainsKey(native2));
     }
 
     [Test]
@@ -338,12 +344,15 @@ public unsafe class CSharpTests : GeneratorTestFixture
     {
         using (var testNativeToManagedMap = new TestNativeToManagedMap())
         {
+            var quxMap = (IDictionary<IntPtr, IQux>) typeof(
+                Qux).GetField("NativeToManagedMap",
+                BindingFlags.Static | BindingFlags.NonPublic).GetValue(null);
             var bar = new Bar();
             testNativeToManagedMap.PropertyWithNoVirtualDtor = bar;
             Assert.AreSame(bar, testNativeToManagedMap.PropertyWithNoVirtualDtor);
-            Assert.IsTrue(Qux.NativeToManagedMap.ContainsKey(bar.__Instance));
+            Assert.IsTrue(quxMap.ContainsKey(bar.__Instance));
             bar.Dispose();
-            Assert.IsFalse(Qux.NativeToManagedMap.ContainsKey(bar.__Instance));
+            Assert.IsFalse(quxMap.ContainsKey(bar.__Instance));
         }
     }
 

tests/NamespacesDerived/NamespacesDerived.cs

@@ -1,3 +1,4 @@
+using System;
 using System.IO;
 using CppSharp.AST;
 using CppSharp.Generators;
@@ -37,12 +38,20 @@ namespace CppSharp.Tests
             new CaseRenamePass(
                 RenameTargets.Function | RenameTargets.Method | RenameTargets.Property | RenameTargets.Delegate | RenameTargets.Variable,
                 RenameCasePattern.UpperCamelCase).VisitASTContext(driver.Context.ASTContext);
+
+            driver.Generator.OnUnitGenerated += o =>
+            {
+                var firstBlock = o.Templates[0].RootBlock.Blocks[1];
+                firstBlock.Text.StringBuilder.Append($@"using System.Runtime.CompilerServices;{
+                    Environment.NewLine}{
+                    Environment.NewLine}[assembly:InternalsVisibleTo(""NamespacesDerived.CSharp"")]{
+                    Environment.NewLine}");
+            };
         }
     }
 
     public class NamespacesDerived
     {
-
         public static void Main(string[] args)
         {
             ConsoleDriver.Run(new NamespacesDerivedTests(GeneratorKind.CSharp));