Added marshalling of primitive ptrs to ref type.

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

src/Generator/Driver.cs

@@ -242,6 +242,7 @@ namespace CppSharp
             TranslationUnitPasses.AddPass(new SortDeclarationsPass());
             TranslationUnitPasses.AddPass(new ResolveIncompleteDeclsPass());
             TranslationUnitPasses.AddPass(new CheckIgnoredDeclsPass());
+            TranslationUnitPasses.AddPass(new MarshalPrimitivePointersAsRefTypePass());
 
             if (Options.IsCSharpGenerator && Options.GenerateInlines)
                 TranslationUnitPasses.AddPass(new GenerateInlinesCodePass());

src/Generator/Generators/CSharp/CSharpTextTemplate.cs

@@ -2146,16 +2146,39 @@ namespace CppSharp.Generators.CSharp
             PopBlock(NewLineKind.BeforeNextBlock);
         }
 
+        private static string OverloadParamNameWithDefValue(Parameter p, ref int index)
+        {
+            return (p.Type.IsPointerToPrimitiveType() && p.Usage == ParameterUsage.InOut && p.HasDefaultValue)
+                ? "ref param" + index++
+                : p.DefaultArgument.String;
+        }
+
         private void GenerateOverloadCall(Function function)
         {
-            Type type = function.OriginalReturnType.Type;
+            for (int i = 0, j = 0; i < function.Parameters.Count; i++)
+            {
+                var parameter = function.Parameters[i];
+                PrimitiveType primitiveType;
+                if (parameter.Kind == ParameterKind.Regular && parameter.Ignore &&
+                    parameter.Type.IsPointerToPrimitiveType(out primitiveType) &&
+                    parameter.Usage == ParameterUsage.InOut && parameter.HasDefaultValue)
+                {
+                    var pointeeType = ((PointerType) parameter.Type).Pointee.ToString();
+                    WriteLine("{0} param{1} = {2};", pointeeType, j++,
+                        primitiveType == PrimitiveType.Bool ? "false" : "0");
+                }
+            }
+
+            var index = 0;
+            var type = function.OriginalReturnType.Type;
             WriteLine("{0}{1}({2});",
                 type.IsPrimitiveType(PrimitiveType.Void) ? string.Empty : "return ",
                 function.Name,
                 string.Join(", ",
                     function.Parameters.Where(
                         p => p.Kind == ParameterKind.Regular).Select(
-                            p => p.Ignore ? p.DefaultArgument.String : p.Name)));
+                            p => p.Ignore ? OverloadParamNameWithDefValue(p, ref index) :
+                                (p.Usage == ParameterUsage.InOut ? "ref " : string.Empty) + p.Name)));
         }
 
         private void GenerateEquals(Function method, Class @class)
@@ -2498,6 +2521,10 @@ namespace CppSharp.Generators.CSharp
 
             if (needsFixedThis && operatorParam == null)
                 WriteCloseBraceIndent();
+            
+            var numFixedBlocks = @params.Count(param => param.HasFixedBlock);
+            for(var i = 0; i < numFixedBlocks; ++i)
+                WriteCloseBraceIndent();
         }
 
         private int GetInstanceParamIndex(Method method)
@@ -2519,6 +2546,8 @@ namespace CppSharp.Generators.CSharp
             {
                 var param = paramInfo.Param;
                 if (!(param.IsOut || param.IsInOut)) continue;
+                if (param.IsPrimitiveParameterConvertibleToRef())
+                    continue;
 
                 var nativeVarName = paramInfo.Name;
 
@@ -2548,6 +2577,7 @@ namespace CppSharp.Generators.CSharp
             public string Name;
             public Parameter Param;
             public CSharpMarshalContext Context;
+            public bool HasFixedBlock;
         }
 
         public List<ParamMarshal> GenerateFunctionParamsMarshal(IEnumerable<Parameter> @params,
@@ -2601,16 +2631,25 @@ namespace CppSharp.Generators.CSharp
 
             paramMarshal.Context = ctx;
 
-            var marshal = new CSharpMarshalManagedToNativePrinter(ctx);
-            param.CSharpMarshalToNative(marshal);
+            if (param.IsPrimitiveParameterConvertibleToRef())
+            {
+                WriteLine("fixed ({0} {1} = &{2})", param.Type.CSharpType(TypePrinter), argName, param.Name);
+                paramMarshal.HasFixedBlock = true;
+                WriteStartBraceIndent();
+            }
+            else
+            {
+                var marshal = new CSharpMarshalManagedToNativePrinter(ctx);
+                param.CSharpMarshalToNative(marshal);
 
-            if (string.IsNullOrEmpty(marshal.Context.Return))
-                throw new Exception("Cannot marshal argument of function");
+                if (string.IsNullOrEmpty(marshal.Context.Return))
+                    throw new Exception("Cannot marshal argument of function");
 
-            if (!string.IsNullOrWhiteSpace(marshal.Context.SupportBefore))
-                Write(marshal.Context.SupportBefore);
+                if (!string.IsNullOrWhiteSpace(marshal.Context.SupportBefore))
+                    Write(marshal.Context.SupportBefore);
 
-            WriteLine("var {0} = {1};", argName, marshal.Context.Return);
+                WriteLine("var {0} = {1};", argName, marshal.Context.Return);
+            }
 
             return paramMarshal;
         }

src/Generator/Generators/ExtensionMethods.cs

@@ -1,4 +1,7 @@
-using CppSharp.AST;
+using System.Linq;
+using System.Collections.Generic;
+using CppSharp.AST;
+using CppSharp.AST.Extensions;
 using Interop = System.Runtime.InteropServices;
 
 namespace CppSharp.Generators
@@ -23,5 +26,25 @@ namespace CppSharp.Generators
 
             return Interop.CallingConvention.Winapi;
         }
+
+        public static bool IsPrimitiveParameterConvertibleToRef(this Parameter param)
+        {
+            var allowedToHaveDefaultPtrVals = new List<PrimitiveType>
+            {
+                PrimitiveType.Bool,
+                PrimitiveType.Double,
+                PrimitiveType.Float,
+                PrimitiveType.Int,
+                PrimitiveType.Long,
+                PrimitiveType.LongLong,
+                PrimitiveType.Short,
+                PrimitiveType.UInt,
+                PrimitiveType.ULong,
+                PrimitiveType.ULongLong,
+                PrimitiveType.UShort
+            };
+            return param.Type.IsPointerToPrimitiveType()
+                && allowedToHaveDefaultPtrVals.Any(primType => param.Type.IsPointerToPrimitiveType(primType));
+        }
     }
 }

src/Generator/Passes/HandleDefaultParamValuesPass.cs

@@ -1,8 +1,10 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Text.RegularExpressions;
+
 using CppSharp.AST;
 using CppSharp.AST.Extensions;
+using CppSharp.Generators;
 using CppSharp.Generators.CSharp;
 using CppSharp.Types;
 
@@ -52,7 +54,8 @@ namespace CppSharp.Passes
                     parameter.QualifiedType.Qualifiers);
                 if (defaultConstruct == null ||
                     (!Driver.Options.MarshalCharAsManagedChar &&
-                     parameter.Type.Desugar().IsPrimitiveType(PrimitiveType.UChar)))
+                     parameter.Type.Desugar().IsPrimitiveType(PrimitiveType.UChar)) ||
+                     parameter.IsPrimitiveParameterConvertibleToRef())
                 {
                     overloadIndices.Add(function.Parameters.IndexOf(parameter));
                     continue;
@@ -103,6 +106,8 @@ namespace CppSharp.Passes
                     parameter.DefaultArgument.String = "new global::System.IntPtr()";
                     return true;
                 }
+                if (parameter.IsPrimitiveParameterConvertibleToRef())
+                    return false;
                 Class @class;
                 if (desugared.GetFinalPointee().TryGetClass(out @class) && @class.IsValueType)
                 {
@@ -243,9 +248,10 @@ namespace CppSharp.Passes
                 Function overload = method != null ? new Method(method) : new Function(function);
                 overload.OriginalFunction = function;
                 overload.SynthKind = FunctionSynthKind.DefaultValueOverload;
-                overload.Parameters[overloadIndex].GenerationKind = GenerationKind.None;
+                for (int i = overloadIndex; i < function.Parameters.Count; ++i)
+                    overload.Parameters[i].GenerationKind = GenerationKind.None;
 
-                var indices = overloadIndices.Where(i => i != overloadIndex).ToList();
+                var indices = overloadIndices.Where(i => i < overloadIndex).ToList();
                 if (indices.Any())
                     for (int i = 0; i <= indices.Last(); i++)
                         if (i != overloadIndex)

src/Generator/Passes/MarshalPrimitivePointersAsRefTypePass.cs

@@ -0,0 +1,17 @@
+using System.Linq;
+using CppSharp.AST;
+using CppSharp.Generators;
+
+namespace CppSharp.Passes
+{
+    public class MarshalPrimitivePointersAsRefTypePass : TranslationUnitPass
+    {
+        public override bool VisitFunctionDecl(Function function)
+        {
+            foreach (var param in function.Parameters.Where(
+                p => !p.IsOut && p.IsPrimitiveParameterConvertibleToRef()))
+                param.Usage = ParameterUsage.InOut;
+            return base.VisitFunctionDecl(function);
+        }
+    }
+}

tests/CSharpTemp/CSharpTemp.Tests.cs

@@ -345,4 +345,38 @@ public class CSharpTempTests : GeneratorTestFixture
             foo.AttributedFunctionPtr = null;
         }
     }
-}
+
+    [Test]
+    public unsafe void TestMultiOverLoadPtrToRef()
+    {
+        var obj = new MultiOverloadPtrToRef();
+        var p = obj.ReturnPrimTypePtr();
+        Assert.AreEqual(0, p[0]);
+        Assert.AreEqual(0, p[1]);
+        Assert.AreEqual(0, p[2]);
+
+        obj.TakePrimTypePtr(ref *p);
+        Assert.AreEqual(100, p[0]);
+        Assert.AreEqual(200, p[1]);
+        Assert.AreEqual(300, p[2]);
+            
+        int[] array = { 1, 2, 3 };
+        fixed (int* p1 = array)
+        {
+            obj.TakePrimTypePtr(ref *p1);
+            Assert.AreEqual(100, p1[0]);
+            Assert.AreEqual(200, p1[1]);
+            Assert.AreEqual(300, p1[2]);
+        }
+
+        Assert.AreEqual(100, array[0]);
+        Assert.AreEqual(200, array[1]);
+        Assert.AreEqual(300, array[2]);
+
+        float pThree = 0;
+        var refInt = 0;
+        obj.FuncPrimitivePtrToRef(ref refInt, null, ref pThree);
+        obj.FuncPrimitivePtrToRefWithDefVal(ref refInt, null, null, ref refInt);
+        obj.FuncPrimitivePtrToRefWithMultiOverload(ref refInt, null, null, ref refInt);
+    }
+}

tests/CSharpTemp/CSharpTemp.cpp

@@ -688,3 +688,32 @@ HasOverrideOfHasPropertyWithDerivedType::HasOverrideOfHasPropertyWithDerivedType
 void HasOverrideOfHasPropertyWithDerivedType::causeRenamingError()
 {
 }
+
+void MultiOverloadPtrToRef::funcPrimitivePtrToRef(int* pOne, char* pTwo, float* pThree, bool* pFour)
+{
+}
+
+void MultiOverloadPtrToRef::funcPrimitivePtrToRefWithDefVal(int* pOne, char* pTwo, Foo* pThree, int* pFour)
+{
+}
+
+void MultiOverloadPtrToRef::funcPrimitivePtrToRefWithMultiOverload(int* pOne, char* pTwo, Foo* pThree, int* pFour, long* pFive)
+{
+}
+
+MultiOverloadPtrToRef::MultiOverloadPtrToRef()
+{
+    arr = new int[3]{0};
+}
+
+int* MultiOverloadPtrToRef::ReturnPrimTypePtr()
+{
+    return arr;
+}
+
+void MultiOverloadPtrToRef::TakePrimTypePtr(int* ptr)
+{
+    ptr[0] = 100;
+    ptr[1] = 200;
+    ptr[2] = 300;
+}

tests/CSharpTemp/CSharpTemp.h

@@ -617,3 +617,16 @@ public:
     HasOverrideOfHasPropertyWithDerivedType();
     virtual void causeRenamingError();
 };
+
+class DLL_API MultiOverloadPtrToRef
+{
+    int * arr;
+public:
+    void funcPrimitivePtrToRef(int *pOne, char* pTwo, float* pThree, bool* pFour = 0);
+    void funcPrimitivePtrToRefWithDefVal(int* pOne, char* pTwo, Foo* pThree, int* pFour = 0);
+    void funcPrimitivePtrToRefWithMultiOverload(int* pOne, char* pTwo, Foo* pThree, int* pFour = 0, long* pFive = 0);
+
+    MultiOverloadPtrToRef();
+    int* ReturnPrimTypePtr();
+    void TakePrimTypePtr(int* ptr);
+};