Fixed the generated C# when a virtual function takes a fixed array.

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

src/Generator/Generators/CSharp/CSharpMarshal.cs

@@ -82,43 +82,51 @@ namespace CppSharp.Generators.CSharp
             switch (array.SizeType)
             {
                 case ArrayType.ArraySize.Constant:
-                    var supportBefore = Context.Before;
-                    string value = Generator.GeneratedIdentifier("value");
-                    supportBefore.WriteLine("{0}[] {1} = null;", array.Type, value, array.Size);
-                    supportBefore.WriteLine("if ({0} != null)", Context.ReturnVarName);
-                    supportBefore.WriteStartBraceIndent();
-                    supportBefore.WriteLine("{0} = new {1}[{2}];", value, array.Type, array.Size);
-                    supportBefore.WriteLine("for (int i = 0; i < {0}; i++)", array.Size);
-                    if (array.Type.IsPointerToPrimitiveType(PrimitiveType.Void))
-                        supportBefore.WriteLineIndent("{0}[i] = new global::System.IntPtr({1}[i]);",
-                            value, Context.ReturnVarName);
-                    else
+                    if (Context.MarshalKind == MarshalKind.NativeField ||
+                        Context.MarshalKind == MarshalKind.ReturnVariableArray)
                     {
-                        var arrayType = array.Type.Desugar();
-                        Class @class;
-                        if (arrayType.TryGetClass(out @class) && @class.IsRefType)
-                            supportBefore.WriteLineIndent(
-                                "{0}[i] = {1}.{2}(*(({1}.{3}*)&({4}[i * sizeof({1}.{3})])));",
-                                value, array.Type, Helpers.CreateInstanceIdentifier,
-                                Helpers.InternalStruct, Context.ReturnVarName);
+                        var supportBefore = Context.Before;
+                        string value = Generator.GeneratedIdentifier("value");
+                        supportBefore.WriteLine("{0}[] {1} = null;", array.Type, value, array.Size);
+                        supportBefore.WriteLine("if ({0} != null)", Context.ReturnVarName);
+                        supportBefore.WriteStartBraceIndent();
+                        supportBefore.WriteLine("{0} = new {1}[{2}];", value, array.Type, array.Size);
+                        supportBefore.WriteLine("for (int i = 0; i < {0}; i++)", array.Size);
+                        if (array.Type.IsPointerToPrimitiveType(PrimitiveType.Void))
+                            supportBefore.WriteLineIndent("{0}[i] = new global::System.IntPtr({1}[i]);",
+                                value, Context.ReturnVarName);
                         else
                         {
-                            if (arrayType.IsPrimitiveType(PrimitiveType.Char) &&
-                                Context.Context.Options.MarshalCharAsManagedChar)
-                            {
+                            var arrayType = array.Type.Desugar();
+                            Class @class;
+                            if (arrayType.TryGetClass(out @class) && @class.IsRefType)
                                 supportBefore.WriteLineIndent(
-                                    "{0}[i] = global::System.Convert.ToChar({1}[i]);",
-                                    value, Context.ReturnVarName);
-                            }
+                                    "{0}[i] = {1}.{2}(*(({1}.{3}*)&({4}[i * sizeof({1}.{3})])));",
+                                    value, array.Type, Helpers.CreateInstanceIdentifier,
+                                    Helpers.InternalStruct, Context.ReturnVarName);
                             else
                             {
-                                supportBefore.WriteLineIndent("{0}[i] = {1}[i];",
-                                    value, Context.ReturnVarName);
+                                if (arrayType.IsPrimitiveType(PrimitiveType.Char) &&
+                                    Context.Context.Options.MarshalCharAsManagedChar)
+                                {
+                                    supportBefore.WriteLineIndent(
+                                        "{0}[i] = global::System.Convert.ToChar({1}[i]);",
+                                        value, Context.ReturnVarName);
+                                }
+                                else
+                                {
+                                    supportBefore.WriteLineIndent("{0}[i] = {1}[i];",
+                                        value, Context.ReturnVarName);
+                                }
                             }
                         }
+                        supportBefore.WriteCloseBraceIndent();
+                        Context.Return.Write(value);
+                    }
+                    else
+                    {
+                        goto case ArrayType.ArraySize.Incomplete;
                     }
-                    supportBefore.WriteCloseBraceIndent();
-                    Context.Return.Write(value);
                     break;
                 case ArrayType.ArraySize.Incomplete:
                     // const char* and const char[] are the same so we can use a string
@@ -128,7 +136,7 @@ namespace CppSharp.Generators.CSharp
                             {
                                 QualifiedPointee = array.QualifiedType
                             }, quals);
-                    MarshalVariableArray(array);
+                    MarshalArray(array);
                     break;
                 case ArrayType.ArraySize.Variable:
                     Context.Return.Write(Context.ReturnVarName);
@@ -384,11 +392,11 @@ namespace CppSharp.Generators.CSharp
             return ret;
         }
 
-        private void MarshalVariableArray(ArrayType array)
+        private void MarshalArray(ArrayType array)
         {
             Type arrayType = array.Type.Desugar();
             if (arrayType.IsPrimitiveType() ||
-                arrayType.IsPointerToPrimitiveType(PrimitiveType.Char) ||
+                arrayType.IsPointerToPrimitiveType() ||
                 Context.MarshalKind != MarshalKind.GenericDelegate)
             {
                 Context.Return.Write(Context.ReturnVarName);

src/Generator/Generators/CSharp/CSharpSources.cs

@@ -1057,6 +1057,7 @@ namespace CppSharp.Generators.CSharp
                 ArgName = var.Name,
                 ReturnType = new QualifiedType(var.Type)
             };
+            ctx.PushMarshalKind(MarshalKind.ReturnVariableArray);
             var prefix = string.Empty;
             if (!isRefTypeArray && elementType == null)
                 ctx.ReturnVarName = $"*{ptr}";

tests/CSharp/CSharp.Tests.cs

@@ -5,7 +5,6 @@ using System.Runtime.InteropServices;
 using CppSharp.Utils;
 using CSharp;
 using NUnit.Framework;
-using CSharp.Delegates;
 
 public unsafe class CSharpTests : GeneratorTestFixture
 {
@@ -1069,29 +1068,35 @@ public unsafe class CSharpTests : GeneratorTestFixture
         using (var testArrays = new TestArrays())
         {
             Assert.That(testArrays.TakeArrays(pointers, ints, values), Is.EqualTo(50));
+            Assert.That(testArrays.VirtualTakeArrays(pointers, ints, values), Is.EqualTo(50));
         }
     }
 
     [Test]
-    public void TestStringArrayParams()
+    public void TestFixedArrayParams()
     {
-        string[] strings = { "The ", "test ", "works." };
+        Foo[] pointers = { new Foo { A = 2 }, new Foo { A = 5 }, new Foo { A = 7 } };
+        var int1 = 6;
+        var int2 = 7;
+        var int3 = 8;
+        var int4 = 9;
+        int[] ints = { int1, int2, int3, int4 };
+        int*[] intPointers = { &int1, &int2, &int3, &int4, &int1 };
         using (var testArrays = new TestArrays())
         {
-            Assert.That(testArrays.TakeStringArray(strings), Is.EqualTo("The test works."));
-            Assert.That(testArrays.TakeConstStringArray(strings), Is.EqualTo("The test works."));
+            Assert.That(testArrays.TakeArrays(pointers, ints, intPointers), Is.EqualTo(80));
+            Assert.That(testArrays.VirtualTakeArrays(pointers, ints, intPointers), Is.EqualTo(80));
         }
     }
 
     [Test]
-    public void TestArrayParamsInVirtual()
+    public void TestStringArrayParams()
     {
-        Foo[] pointers = { new Foo { A = 2 }, new Foo { A = 5 } };
-        int[] ints = { 6, 7 };
-        Foo[] values = { new Foo { A = 10 }, new Foo { A = 20 } };
+        string[] strings = { "The ", "test ", "works." };
         using (var testArrays = new TestArrays())
         {
-            Assert.That(testArrays.VirtualTakesArrays(pointers, ints, values), Is.EqualTo(50));
+            Assert.That(testArrays.TakeStringArray(strings), Is.EqualTo("The test works."));
+            Assert.That(testArrays.TakeConstStringArray(strings), Is.EqualTo("The test works."));
         }
     }
 

tests/CSharp/CSharp.cpp

@@ -1410,9 +1410,20 @@ int TestArrays::takeArrays(Foo* arrayOfPointersToObjects[], int arrayOfPrimitive
 int TestArrays::takeArrays(Foo* fixedArrayOfPointersToObjects[3], int fixedArrayOfPrimitives[4],
                            int* fixedArrayOfPointersToPrimitives[5]) const
 {
-    return fixedArrayOfPointersToObjects[0]->A + fixedArrayOfPointersToObjects[1]->A +
-           fixedArrayOfPrimitives[0] + fixedArrayOfPrimitives[1] +
-           *fixedArrayOfPointersToPrimitives[0] + *fixedArrayOfPointersToPrimitives[1];
+    int sum = 0;
+    for (int i = 0; i < 3; i++)
+    {
+        sum += fixedArrayOfPointersToObjects[i]->A;
+    }
+    for (int i = 0; i < 4; i++)
+    {
+        sum += fixedArrayOfPrimitives[i];
+    }
+    for (int i = 0; i < 5; i++)
+    {
+        sum += *fixedArrayOfPointersToPrimitives[i];
+    }
+    return sum;
 }
 
 std::string TestArrays::takeStringArray(const char* arrayOfStrings[])
@@ -1430,7 +1441,12 @@ std::string TestArrays::takeConstStringArray(const char* const arrayOfStrings[])
     return takeStringArray(const_cast<const char**>(arrayOfStrings));
 }
 
-int TestArrays::virtualTakesArrays(Foo* arrayOfPointersToObjects[], int arrayOfPrimitives[], Foo arrayOfObjects[]) const
+int TestArrays::virtualTakeArrays(Foo* arrayOfPointersToObjects[], int arrayOfPrimitives[], Foo arrayOfObjects[]) const
 {
     return takeArrays(arrayOfPointersToObjects, arrayOfPrimitives, arrayOfObjects);
 }
+
+int TestArrays::virtualTakeArrays(Foo *fixedArrayOfPointersToObjects[], int fixedArrayOfPrimitives[], int *fixedArrayOfPointersToPrimitives[]) const
+{
+    return takeArrays(fixedArrayOfPointersToObjects, fixedArrayOfPrimitives, fixedArrayOfPointersToPrimitives);
+}

tests/CSharp/CSharp.h

@@ -1247,5 +1247,7 @@ public:
                    int* fixedArrayOfPointersToPrimitives[5]) const;
     std::string takeStringArray(const char* arrayOfStrings[]);
     std::string takeConstStringArray(const char* const arrayOfStrings[]);
-    virtual int virtualTakesArrays(Foo* arrayOfPointersToObjects[], int arrayOfPrimitives[], Foo arrayOfObjects[]) const;
+    virtual int virtualTakeArrays(Foo* arrayOfPointersToObjects[], int arrayOfPrimitives[], Foo arrayOfObjects[]) const;
+    virtual int virtualTakeArrays(Foo* fixedArrayOfPointersToObjects[3], int fixedArrayOfPrimitives[4],
+                                  int* fixedArrayOfPointersToPrimitives[5]) const;
 };