Wrapped properties of non-primitive value types as fields.

Signed-off-by: Dimitar Dobrev <dpldobrev@yahoo.com>

src/AST/Property.cs

@@ -104,5 +104,18 @@ namespace CppSharp.AST
         {
             return visitor.VisitProperty(this);
         }
+
+        public bool IsBackedByValueClassField()
+        {
+            if (Field == null)
+                return false;
+
+            Type type;
+            Field.Type.IsPointerTo(out type);
+            type = type ?? Field.Type;
+
+            Class decl;
+            return type.IsTagDecl(out decl) && decl.IsValueType;
+        }
     }
 }

src/Generator/Generators/CLI/CLIHeadersTemplate.cs

@@ -396,7 +396,7 @@ namespace CppSharp.Generators.CLI
         public void GenerateClassFields(Class @class)
         {
             // Handle the case of struct (value-type) inheritance by adding the base
-            // fields to the managed value subtypes.
+            // properties to the managed value subtypes.
             foreach (var @base in @class.Bases)
             {
                 if (!@base.IsClass)
@@ -404,28 +404,33 @@ namespace CppSharp.Generators.CLI
 
                 Class baseClass = @base.Class;
                 if (!baseClass.IsValueType || baseClass.Ignore)
-                {
-                    Log.EmitMessage("Ignored base class of value type '{0}'",
-                        baseClass.Name);
                     continue;
-                }
 
                 GenerateClassFields(baseClass);
             }
 
             PushIndent();
-            foreach (var field in @class.Fields)
+            // check for value types because some of the ignored fields may back properties;
+            // not the case for ref types because the NativePtr pattern is used there
+            foreach (var field in @class.Fields.Where(f => !f.Ignore || @class.IsValueType))
             {
-                if (ASTUtils.CheckIgnoreField(field) && !@class.IsValueType) continue;
+                var property = @class.Properties.FirstOrDefault(p => p.Field == field);
+                if (property != null && !property.IsBackedByValueClassField())
+                {
+                    GenerateField(@class, field);
+                }
+            }
+            PopIndent();
+        }
 
+        private void GenerateField(Class @class, Field field)
+        {
             GenerateDeclarationCommon(field);
             if (@class.IsUnion)
                 WriteLine("[System::Runtime::InteropServices::FieldOffset({0})]",
                     field.Offset);
             WriteLine("{0} {1};", field.Type, SafeIdentifier(field.Name));
         }
-            PopIndent();
-        }
 
         public void GenerateClassEvents(Class @class)
         {
@@ -560,10 +565,10 @@ namespace CppSharp.Generators.CLI
             return false;
         }
 
-        public void GenerateClassProperties(Class @class, bool onlyFieldProperties = false)
+        public void GenerateClassProperties(Class @class)
         {
             // Handle the case of struct (value-type) inheritance by adding the base
-            // fields to the managed value subtypes.
+            // properties to the managed value subtypes.
             foreach (var @base in @class.Bases)
             {
                 if (!@base.IsClass)
@@ -571,19 +576,19 @@ namespace CppSharp.Generators.CLI
 
                 Class baseClass = @base.Class;
                 if (!baseClass.IsValueType || baseClass.Ignore)
-                {
-                    Log.EmitMessage("Ignored base class of value type '{0}'",
-                        baseClass.Name);
                     continue;
-                }
 
-                GenerateClassProperties(baseClass, true);
+                GenerateClassProperties(baseClass);
             }
 
             PushIndent();
-            foreach (var prop in @class.Properties)
+            foreach (var prop in @class.Properties.Where(prop => !prop.Ignore))
             {
-                if (prop.Ignore || (onlyFieldProperties && prop.Field == null)) continue;
+                if (prop.IsBackedByValueClassField())
+                {
+                    GenerateField(@class, prop.Field);
+                    continue;
+                }
 
                 GenerateDeclarationCommon(prop);
                 GenerateProperty(prop);

src/Generator/Generators/CLI/CLISourcesTemplate.cs

@@ -191,19 +191,18 @@ namespace CppSharp.Generators.CLI
             PopBlock();
         }
 
-        private void GenerateClassProperties(Class @class, Class realOwner,
+        private void GenerateClassProperties(Class @class, Class realOwner)
-            bool onlyFieldProperties = false)
         {
             if (@class.IsValueType)
             {
                 foreach (var @base in @class.Bases.Where(b => b.IsClass && !b.Class.Ignore))
                 {
-                    GenerateClassProperties(@base.Class, realOwner, true);
+                    GenerateClassProperties(@base.Class, realOwner);
                 }
             }
 
             foreach (var property in @class.Properties.Where(
-                p => !p.Ignore && (!onlyFieldProperties || p.Field != null)))
+                p => !p.Ignore && !p.IsBackedByValueClassField()))
                 GenerateProperty(property, realOwner);
         }
 
@@ -575,8 +574,7 @@ namespace CppSharp.Generators.CLI
                 if (!string.IsNullOrWhiteSpace(marshal.Context.SupportBefore))
                     Write(marshal.Context.SupportBefore);
 
-                WriteLine("{0} = {1};",
+                WriteLine("{0} = {1};", property.Field.Name, marshal.Context.Return);
-                    Generator.GeneratedIdentifier(property.Field.OriginalName), marshal.Context.Return);
             }
         }
 

src/Generator/Generators/CSharp/CSharpTextTemplate.cs

@@ -672,32 +672,32 @@ namespace CppSharp.Generators.CSharp
             }
         }
 
-        private void GenerateStructInternalMarshalingProperty(Property field, string marshalVar)
+        private void GenerateStructInternalMarshalingProperty(Property property, string marshalVar)
         {
             var marshalCtx = new CSharpMarshalContext(Driver)
             {
-                ArgName = field.Name,
+                ArgName = property.Name,
             };
 
             var marshal = new CSharpMarshalManagedToNativePrinter(marshalCtx);
-            field.Visit(marshal);
+            property.Visit(marshal);
 
             Type type;
             Class @class;
-            var isRef = field.Type.IsPointerTo(out type) &&
+            var isRef = property.Type.IsPointerTo(out type) &&
                 !(type.IsTagDecl(out @class) && @class.IsValueType) &&
                 !type.IsPrimitiveType();
 
             if (isRef)
             {
-                WriteLine("if ({0} != null)", field.Name);
+                WriteLine("if ({0} != null)", property.Name);
                 WriteStartBraceIndent();
             }
 
             if (!string.IsNullOrWhiteSpace(marshal.Context.SupportBefore))
                WriteLine(marshal.Context.SupportBefore);
 
-           WriteLine("{0}.{1} = {2};", marshalVar, field.OriginalName, marshal.Context.Return);
+           WriteLine("{0}.{1} = {2};", marshalVar, property.OriginalName, marshal.Context.Return);
 
             if (isRef)
                 WriteCloseBraceIndent();
@@ -797,7 +797,7 @@ namespace CppSharp.Generators.CSharp
             PopBlock(NewLineKind.BeforeNextBlock);
         }
 
-        private void GenerateClassField(Field field)
+        private void GenerateClassField(Field field, bool @public = false)
         {
             PushBlock(CSharpBlockKind.Field);
 
@@ -807,7 +807,8 @@ namespace CppSharp.Generators.CSharp
             if (@class.IsUnion)
                 WriteLine("[FieldOffset({0})]", field.Offset);
 
-            WriteLine("private {0} {1};", field.Type, SafeIdentifier(field.Name));
+            WriteLine("{0} {1} {2};", @public ? "public" : "private",
+                field.Type, SafeIdentifier(field.Name));
 
             PopBlock(NewLineKind.BeforeNextBlock);
         }
@@ -913,6 +914,7 @@ namespace CppSharp.Generators.CSharp
                     PopBlock(NewLineKind.BeforeNextBlock);
                     return;
                 }
+
                 WriteStartBraceIndent();
                 var field = decl as Field;
 
@@ -1006,6 +1008,7 @@ namespace CppSharp.Generators.CSharp
                     PopBlock(NewLineKind.BeforeNextBlock);
                     return;
                 }
+
                 NewLine();
                 WriteStartBraceIndent();
                 var field = decl as Field;
@@ -1108,24 +1111,29 @@ namespace CppSharp.Generators.CSharp
             }
         }
 
-        private void GenerateClassProperties(Class @class, bool onlyFieldProperties = false)
+        private void GenerateClassProperties(Class @class)
         {
             if (@class.IsValueType)
             {
                 foreach (var @base in @class.Bases.Where(b => b.IsClass && !b.Class.Ignore))
                 {
-                    GenerateClassProperties(@base.Class, true);
+                    GenerateClassProperties(@base.Class);
                 }   
             }
 
-            GenerateProperties(@class, onlyFieldProperties);
+            GenerateProperties(@class);
         }
 
-        private void GenerateProperties(Class @class, bool onlyFieldProperties = false)
+        private void GenerateProperties(Class @class)
         {
-            foreach (var prop in @class.Properties.Where(
+            foreach (var prop in @class.Properties.Where(p => !p.Ignore))
-                p => !p.Ignore && (!onlyFieldProperties || p.Field != null)))
             {
+                if (prop.IsBackedByValueClassField())
+                {
+                    GenerateClassField(prop.Field, true);
+                    continue;
+                }
+
                 PushBlock(CSharpBlockKind.Property);
 
                 // If this is an indexer that returns an address use the real type

src/Generator/Passes/FieldToPropertyPass.cs

@@ -39,8 +39,13 @@ namespace CppSharp.Passes
                 Access = field.Access,
                 Field = field
             };
+
+            // do not rename value-class fields because they would be
+            // generated as fields later on even though they are wrapped by properties;
+            // that is, in turn, because it's cleaner to write
+            // the struct marshalling logic just for properties
+            if (!prop.IsBackedByValueClassField())
                 field.Name = Generator.GeneratedIdentifier(field.Name);
-            @class.Properties.Add(prop);
 
             @class.Properties.Add(prop);
 

tests/Basic/Basic.Tests.cs

@@ -173,5 +173,12 @@ public class BasicTests : GeneratorTestFixture
         Assert.That(nestedPublic.l, Is.EqualTo(5));
         Assert.That(nestedPublic.g, Is.Not.EqualTo(0));
     }
+
+    public void TestPropertyChains()
+    {
+        var bar2 = new Bar2();
+        bar2.pointerToStruct.A = 15;
+        Assert.That(bar2.pointerToStruct.A, Is.EqualTo(15));
+    }
 }