Added support for parameters with type a reference to a fixed-size array.

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

src/Generator/Generators/CLI/CLIMarshal.cs

@@ -431,14 +431,26 @@ namespace CppSharp.Generators.CLI
             switch (array.SizeType)
             {
                 case ArrayType.ArraySize.Constant:
-                    var supportBefore = Context.SupportBefore;
-                    supportBefore.WriteLine("if ({0} != nullptr)", Context.ArgName);
-                    supportBefore.WriteStartBraceIndent();
-                    supportBefore.WriteLine("for (int i = 0; i < {0}; i++)", array.Size);
-                    supportBefore.WriteLineIndent("{0}[i] = {1}[i]{2};",
-                        Context.ReturnVarName, Context.ArgName,
-                        array.Type.IsPointerToPrimitiveType(PrimitiveType.Void) ? ".ToPointer()" : string.Empty);
-                    supportBefore.WriteCloseBraceIndent();
+                    if (string.IsNullOrEmpty(Context.ReturnVarName))
+                    {
+                        const string pinnedPtr = "__pinnedPtr";
+                        Context.SupportBefore.WriteLine("cli::pin_ptr<{0}> {1} = &{2}[0];",
+                            array.Type, pinnedPtr, Context.Parameter.Name);
+                        const string arrayPtr = "__arrayPtr";
+                        Context.SupportBefore.WriteLine("{0}* {1} = {2};", array.Type, arrayPtr, pinnedPtr);
+                        Context.Return.Write("({0} (&)[{1}]) {2}", array.Type, array.Size, arrayPtr);
+                    }
+                    else
+                    {
+                        var supportBefore = Context.SupportBefore;
+                        supportBefore.WriteLine("if ({0} != nullptr)", Context.ArgName);
+                        supportBefore.WriteStartBraceIndent();
+                        supportBefore.WriteLine("for (int i = 0; i < {0}; i++)", array.Size);
+                        supportBefore.WriteLineIndent("{0}[i] = {1}[i]{2};",
+                            Context.ReturnVarName, Context.ArgName,
+                            array.Type.IsPointerToPrimitiveType(PrimitiveType.Void) ? ".ToPointer()" : string.Empty);
+                        supportBefore.WriteCloseBraceIndent();   
+                    }
                     break;
                 default:
                     Context.Return.Write("null");

src/Generator/Generators/CSharp/CSharpMarshal.cs

@@ -30,6 +30,7 @@ namespace CppSharp.Generators.CSharp
 
         public TextGenerator ArgumentPrefix { get; private set; }
         public TextGenerator Cleanup { get; private set; }
+        public bool HasFixedBlock { get; set; }
     }
 
     public abstract class CSharpMarshalPrinter : MarshalPrinter
@@ -390,28 +391,43 @@ namespace CppSharp.Generators.CSharp
             if (!VisitType(array, quals))
                 return false;
 
-            Class @class;
             switch (array.SizeType)
             {
                 case ArrayType.ArraySize.Constant:
-                    var supportBefore = Context.SupportBefore;
-                    supportBefore.WriteLine("if ({0} != null)", Context.ArgName);
-                    supportBefore.WriteStartBraceIndent();
-                    if (array.Type.Desugar().TryGetClass(out @class) && @class.IsRefType)
+                    if (string.IsNullOrEmpty(Context.ReturnVarName))
                     {
-                        supportBefore.WriteLine("if (value.Length != {0})", array.Size);
-                        supportBefore.WriteLineIndent("throw new ArgumentOutOfRangeException(\"{0}\", \"The provided array's dimensions doesn't match the required size.\");",
-                            Context.Parameter.Name);
+                        Context.SupportBefore.WriteLine("if ({0} == null || {0}.Length != {1})", Context.Parameter.Name, array.Size);
+                        ThrowArgumentOutOfRangeException();
+                        const string ptr = "__ptr";
+                        Context.SupportBefore.WriteLine("fixed ({0}* {1} = {2})", array.Type, ptr, Context.Parameter.Name);
+                        Context.SupportBefore.WriteStartBraceIndent();
+                        Context.Return.Write("new global::System.IntPtr({0})", ptr);
+                        CSharpContext.HasFixedBlock = true;
                     }
-                    supportBefore.WriteLine("for (int i = 0; i < {0}; i++)", array.Size);
-                    if (@class != null && @class.IsRefType)
-                        supportBefore.WriteLineIndent("{0}[i * sizeof({2}.Internal)] = *((byte*)({2}.Internal*){1}[i].__Instance);",
-                            Context.ReturnVarName, Context.ArgName, array.Type);
                     else
-                        supportBefore.WriteLineIndent("{0}[i] = {1}[i]{2};",
-                            Context.ReturnVarName, Context.ArgName,
-                            array.Type.IsPointerToPrimitiveType(PrimitiveType.Void) ? ".ToPointer()" : string.Empty);
-                    supportBefore.WriteCloseBraceIndent();
+                    {
+                        var supportBefore = Context.SupportBefore;
+                        supportBefore.WriteLine("if ({0} != null)", Context.ArgName);
+                        supportBefore.WriteStartBraceIndent();
+                        Class @class;
+                        if (array.Type.Desugar().TryGetClass(out @class) && @class.IsRefType)
+                        {
+                            supportBefore.WriteLine("if (value.Length != {0})", array.Size);
+                            ThrowArgumentOutOfRangeException();
+                        }
+                        supportBefore.WriteLine("for (int i = 0; i < {0}; i++)", array.Size);
+                        if (@class != null && @class.IsRefType)
+                            supportBefore.WriteLineIndent(
+                                "{0}[i * sizeof({2}.Internal)] = *((byte*)({2}.Internal*){1}[i].__Instance);",
+                                Context.ReturnVarName, Context.ArgName, array.Type);
+                        else
+                            supportBefore.WriteLineIndent("{0}[i] = {1}[i]{2};",
+                                Context.ReturnVarName, Context.ArgName,
+                                array.Type.IsPointerToPrimitiveType(PrimitiveType.Void)
+                                    ? ".ToPointer()"
+                                    : string.Empty);
+                        supportBefore.WriteCloseBraceIndent();
+                    }
                     break;
                 default:
                     Context.Return.Write("null");
@@ -420,6 +436,14 @@ namespace CppSharp.Generators.CSharp
             return true;
         }
 
+        private void ThrowArgumentOutOfRangeException()
+        {
+            Context.SupportBefore.WriteLineIndent(
+                "throw new ArgumentOutOfRangeException(\"{0}\", " +
+                "\"The dimensions of the provided array don't match the required size.\");",
+                Context.Parameter.Name);
+        }
+
         public bool VisitDelegateType(FunctionType function, string type)
         {
             Context.Return.Write("{0} == null ? global::System.IntPtr.Zero : Marshal.GetFunctionPointerForDelegate({0})",
@@ -432,6 +456,17 @@ namespace CppSharp.Generators.CSharp
             if (!VisitType(pointer, quals))
                 return false;
 
+            if (Context.Function != null && pointer.IsPrimitiveTypeConvertibleToRef())
+            {
+                string refParamPtr = string.Format("__refParamPtr{0}", Context.ParameterIndex);
+                Context.SupportBefore.WriteLine("fixed ({0} {1} = &{2})",
+                    pointer, refParamPtr, Context.Parameter.Name);
+                CSharpContext.HasFixedBlock = true;
+                Context.SupportBefore.WriteStartBraceIndent();
+                Context.Return.Write(refParamPtr);
+                return true;
+            }
+
             var param = Context.Parameter;
             var isRefParam = param != null && (param.IsInOut || param.IsOut);
 

src/Generator/Generators/CSharp/CSharpTextTemplate.cs

@@ -2693,7 +2693,7 @@ namespace CppSharp.Generators.CSharp
                 if ((paramType.GetFinalPointee() ?? paramType).Desugar().TryGetClass(out @class))
                 {
                     var qualifiedIdentifier = CSharpMarshalNativeToManagedPrinter.QualifiedIdentifier(
-                                              @class.OriginalClass ?? @class);
+                        @class.OriginalClass ?? @class);
                     WriteLine("{0} = new {1}();", name, qualifiedIdentifier);
                 }
             }
@@ -2707,26 +2707,20 @@ namespace CppSharp.Generators.CSharp
             };
 
             paramMarshal.Context = ctx;
+            var marshal = new CSharpMarshalManagedToNativePrinter(ctx);
+            param.CSharpMarshalToNative(marshal);
+            paramMarshal.HasFixedBlock = ctx.HasFixedBlock;
 
-            if (param.Type.IsPrimitiveTypeConvertibleToRef())
-            {
-                WriteLine("fixed ({0} {1} = &{2})", param.Type.CSharpType(TypePrinter), argName, 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);
+            if (paramMarshal.HasFixedBlock)
+                PushIndent();
 
-                WriteLine("var {0} = {1};", argName, marshal.Context.Return);
-            }
+            WriteLine("var {0} = {1};", argName, marshal.Context.Return);
 
             return paramMarshal;
         }

src/Generator/Generators/CSharp/CSharpTypePrinter.cs

@@ -276,7 +276,8 @@ namespace CppSharp.Generators.CSharp
             }
 
             Class @class;
-            if ((desugared.IsDependent || desugared.TryGetClass(out @class))
+            if ((desugared.IsDependent || desugared.TryGetClass(out @class) ||
+                (desugared is ArrayType && Context.Parameter != null))
                 && ContextKind == CSharpTypePrinterContextKind.Native)
             {
                 return "global::System.IntPtr";

tests/CSharp/CSharp.Tests.cs

@@ -415,7 +415,7 @@ public class CSharpTests : GeneratorTestFixture
         foosMore[1] = new Foo();
         var ex = Assert.Throws<ArgumentOutOfRangeException>(() => bar.Foos = foosMore);
         Assert.AreEqual("value", ex.ParamName);
-        Assert.AreEqual("The provided array's dimensions doesn't match the required size." + Environment.NewLine +"Parameter name: value", ex.Message);
+        Assert.AreEqual("The dimensions of the provided array don't match the required size." + Environment.NewLine + "Parameter name: value", ex.Message);
     }
 
     [Test]
@@ -443,4 +443,14 @@ public class CSharpTests : GeneratorTestFixture
     {
         Assert.That(sizeof(DerivesFromTemplateInstantiation.Internal), Is.EqualTo(sizeof(int)));
     }
+
+    [Test]
+    public void TestReferenceToArrayWithConstSize()
+    {
+        int[] incorrectlySizedArray = { 1 };
+        Assert.Catch<ArgumentOutOfRangeException>(() => CSharp.CSharp.PassConstantArrayRef(incorrectlySizedArray));
+        int[] array = { 1, 2 };
+        var result = CSharp.CSharp.PassConstantArrayRef(array);
+        Assert.That(result, Is.EqualTo(array[0]));
+    }
 }

tests/CSharp/CSharp.cpp

@@ -798,3 +798,8 @@ TemplateWithDependentField<T>::TemplateWithDependentField()
 DerivesFromTemplateInstantiation::DerivesFromTemplateInstantiation()
 {
 }
+
+int PassConstantArrayRef(int(&arr)[2])
+{
+    return arr[0];
+}

tests/CSharp/CSharp.h

@@ -731,3 +731,5 @@ class DerivesFromTemplateInstantiation : public TemplateWithDependentField<int>
 public:
     DerivesFromTemplateInstantiation();
 };
+
+DLL_API int PassConstantArrayRef(int(&arr)[2]);