Revert "Fixed a crash when calling the dtor of an abstract type with MinGW."

This reverts commit 67e6e1204c.

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

src/Generator/Generators/CSharp/CSharpTextTemplate.cs

@@ -512,11 +512,7 @@ namespace CppSharp.Generators.CSharp
                     method.SynthKind != FunctionSynthKind.AdjustedMethod)
                     return;
 
-                if (method.IsProxy ||
-                    (method.IsVirtual && !method.IsOperator &&
-                    // virtual destructors in abstract classes may lack a pointer in the v-table
-                    // so they have to be called by symbol and therefore not ignored
-                    !(method.IsDestructor && @class.IsAbstract)))
+                if (method.IsProxy || (method.IsVirtual && !method.IsOperator))
                     return;
 
                 functions.Add(method);
@@ -1394,7 +1390,7 @@ namespace CppSharp.Generators.CSharp
         {
             if (method.IsDestructor)
             {
-                WriteLine("{0}.DisposeImpl(false);", Helpers.TargetIdentifier);
+                WriteLine("{0}.Dispose(false);", Helpers.TargetIdentifier);
                 return;
             }
 
@@ -1702,13 +1698,7 @@ namespace CppSharp.Generators.CSharp
                 var dtor = @class.Destructors.FirstOrDefault(d => d.Access != AccessSpecifier.Private && d.IsVirtual);
                 var baseDtor = @class.BaseClass == null ? null :
                     @class.BaseClass.Destructors.FirstOrDefault(d => !d.IsVirtual);
-                if (ShouldGenerateClassNativeField(@class) || (dtor != null && baseDtor != null) ||
-                    // virtual destructors in abstract classes may lack a pointer in the v-table
-                    // so they have to be called by symbol; thus we need an explicit Dispose override
-                    @class.IsAbstract ||
-                    // if the base type is abstract and the current type not,
-                    // we need the regular v-table call so we have to override Dispose again
-                    (!@class.IsAbstractImpl && @class.BaseClass != null && @class.BaseClass.IsAbstract))
+                if (ShouldGenerateClassNativeField(@class) || (dtor != null && baseDtor != null))
                     GenerateDisposeMethods(@class);
             }
         }
@@ -1732,6 +1722,21 @@ namespace CppSharp.Generators.CSharp
         {
             var hasBaseClass = @class.HasBaseClass && @class.BaseClass.IsRefType;
 
+            // Generate the IDispose Dispose() method.
+            if (!hasBaseClass)
+            {
+                PushBlock(CSharpBlockKind.Method);
+                WriteLine("public void Dispose()");
+                WriteStartBraceIndent();
+
+                WriteLine("Dispose(disposing: true);");
+                if (Options.GenerateFinalizers)
+                    WriteLine("GC.SuppressFinalize(this);");
+
+                WriteCloseBraceIndent();
+                PopBlock(NewLineKind.BeforeNextBlock);
+            }
+
             // Generate Dispose(bool) method
             PushBlock(CSharpBlockKind.Method);
             if (@class.IsValueType)
@@ -1746,43 +1751,6 @@ namespace CppSharp.Generators.CSharp
 
             WriteLine("void Dispose(bool disposing)");
             WriteStartBraceIndent();
-
-            var dtor = @class.Destructors.FirstOrDefault();
-            if (dtor != null && dtor.Access != AccessSpecifier.Private &&
-                @class.HasNonTrivialDestructor && !dtor.IsPure)
-            {
-                NativeLibrary library;
-                if (!Options.CheckSymbols ||
-                    Driver.Symbols.FindLibraryBySymbol(dtor.Mangled, out library))
-                {
-                    if (dtor.IsVirtual && !@class.IsAbstract)
-                        GenerateVirtualFunctionCall(dtor, @class, true);
-                    else
-                        GenerateInternalFunctionCall(dtor);
-                }
-            }
-
-            WriteCloseBraceIndent();
-            PopBlock(NewLineKind.BeforeNextBlock);
-
-            if (hasBaseClass) return;
-
-            // Generate the IDispose Dispose() method.
-            PushBlock(CSharpBlockKind.Method);
-            WriteLine("public void Dispose()");
-            WriteStartBraceIndent();
-
-            WriteLine("DisposeImpl(disposing: true);");
-            if (Options.GenerateFinalizers)
-                WriteLine("GC.SuppressFinalize(this);");
-
-            WriteCloseBraceIndent();
-            PopBlock(NewLineKind.BeforeNextBlock);
-
-            PushBlock(CSharpBlockKind.Method);
-            WriteLine("protected void DisposeImpl(bool disposing)");
-            WriteStartBraceIndent();
-
             WriteLine("if (!{0} && disposing)", Helpers.OwnsNativeInstanceIdentifier);
             WriteLineIndent("throw new global::System.InvalidOperationException" +
                 "(\"Managed instances owned by native code cannot be disposed of.\");");
@@ -1812,7 +1780,20 @@ namespace CppSharp.Generators.CSharp
                 }
             }
 
-            WriteLine("Dispose(disposing: true);");
+            var dtor = @class.Destructors.FirstOrDefault();
+            if (dtor != null && dtor.Access != AccessSpecifier.Private &&
+                @class.HasNonTrivialDestructor && !dtor.IsPure)
+            {
+                NativeLibrary library;
+                if (!Options.CheckSymbols ||
+                    Driver.Symbols.FindLibraryBySymbol(dtor.Mangled, out library))
+                {
+                    if (dtor.IsVirtual)
+                        GenerateVirtualFunctionCall(dtor, @class);
+                    else
+                        GenerateInternalFunctionCall(dtor);
+                }
+            }
 
             WriteLine("if ({0})", Helpers.OwnsNativeInstanceIdentifier);
             WriteLineIndent("Marshal.FreeHGlobal({0});", Helpers.InstanceIdentifier);
@@ -2252,11 +2233,14 @@ namespace CppSharp.Generators.CSharp
 
         private static AccessSpecifier GetValidPropertyAccess(Property property)
         {
-            if (property.Access == AccessSpecifier.Public)
+            switch (property.Access)
+            {
+                case AccessSpecifier.Public:
                     return AccessSpecifier.Public;
-            return property.IsOverride
-                ? ((Class) property.Namespace).GetBaseProperty(property).Access
-                : property.Access;
+                default:
+                    return property.IsOverride ?
+                        ((Class) property.Namespace).GetBaseProperty(property).Access : property.Access;
+            }
         }
 
         private void GenerateVirtualPropertyCall(Function method, Class @class,
@@ -2266,8 +2250,7 @@ namespace CppSharp.Generators.CSharp
                 method.SynthKind != FunctionSynthKind.AbstractImplCall &&
                 @class.HasNonAbstractBaseProperty(property))
             {
-                WriteLine(parameters == null ?
-                    "return base.{0};" : "base.{0} = value;", property.Name);
+                WriteLine(parameters == null ? "return base.{0};" : "base.{0} = value;", property.Name);
             }
             else
             {
@@ -2277,10 +2260,9 @@ namespace CppSharp.Generators.CSharp
             }
         }
 
-        private void GenerateVirtualFunctionCall(Method method, Class @class,
-            bool forceVirtualCall = false)
+        private void GenerateVirtualFunctionCall(Method method, Class @class)
         {
-            if (!forceVirtualCall && method.IsOverride && !method.IsPure &&
+            if (method.IsOverride && !method.IsPure &&
                 method.SynthKind != FunctionSynthKind.AbstractImplCall &&
                 @class.HasNonAbstractBaseMethod(method))
             {
@@ -2299,8 +2281,7 @@ namespace CppSharp.Generators.CSharp
         {
             var virtualCallBuilder = new StringBuilder();
             var i = VTables.GetVTableIndex(function.OriginalFunction ?? function, @class);
-            virtualCallBuilder.AppendFormat(
-                "var {0} = *(void**) ((IntPtr) __OriginalVTables[0] + {1} * {2});",
+            virtualCallBuilder.AppendFormat("var {0} = *(void**) ((IntPtr) __OriginalVTables[0] + {1} * {2});",
                 Helpers.SlotIdentifier, i, Driver.TargetInfo.PointerWidth / 8);
             virtualCallBuilder.AppendLine();
 

tests/Common/Common.Tests.cs

@@ -555,20 +555,5 @@ public class CommonTests : GeneratorTestFixture
             Assert.That(hasProblematicFields.c, Is.EqualTo('a'));
         }
     }
-
-    [Test]
-    public void TestDisposingCustomDerivedFromVirtual()
-    {
-        using (new CustomDerivedFromVirtual())
-        {
-        }
-    }
-
-    private class CustomDerivedFromVirtual : AbstractWithVirtualDtor
-    {
-        public override void @abstract()
-        {
-        }
-    }
 }
  

tests/Common/Common.cpp

@@ -555,11 +555,3 @@ int OverridesNonDirectVirtual::retInt()
 {
     return 3;
 }
-
-AbstractWithVirtualDtor::AbstractWithVirtualDtor()
-{
-}
-
-AbstractWithVirtualDtor::~AbstractWithVirtualDtor()
-{
-}

tests/Common/Common.h

@@ -933,11 +933,3 @@ AbstractTemplate<T>::AbstractTemplate()
 and therefore %HashBase pointers should never be used.
 */
 class DLL_API TestComments {};
-
-class DLL_API AbstractWithVirtualDtor
-{
-public:
-    AbstractWithVirtualDtor();
-    virtual ~AbstractWithVirtualDtor();
-    virtual void abstract() = 0;
-};