Support indirect parameters

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

src/CppParser/Parser.cpp

@@ -3286,14 +3286,11 @@ void Parser::WalkFunction(const clang::FunctionDecl* FD, Function* F,
     F->isReturnIndirect = CGInfo.getReturnInfo().isIndirect();
 
     unsigned Index = 0;
-    for (auto I = CGInfo.arg_begin(), E = CGInfo.arg_end(); I != E; I++)
+    for (const auto& Arg : CGInfo.arguments())
     {
-        // Skip the first argument as it's the return type.
-        if (I == CGInfo.arg_begin())
-            continue;
         if (Index >= F->Parameters.size())
             continue;
-        F->Parameters[Index++]->isIndirect = I->info.isIndirect();
+        F->Parameters[Index++]->isIndirect = Arg.info.isIndirect();
     }
 
     MarkValidity(F);

src/Generator/Generators/CSharp/CSharpMarshal.cs

@@ -551,6 +551,10 @@ namespace CppSharp.Generators.CSharp
                 }
 
                 pointer.QualifiedPointee.Visit(this);
+
+                if (Context.Parameter.IsIndirect)
+                    Context.ArgumentPrefix.Write("&");
+
                 bool isVoid = primitive == PrimitiveType.Void &&
                     pointee.IsAddress() && pointer.IsReference();
                 if (pointer.Pointee.Desugar(false) is TemplateParameterSubstitutionType ||

src/Generator/Generators/CSharp/CSharpTypePrinter.cs

@@ -201,7 +201,8 @@ namespace CppSharp.Generators.CSharp
             // * Any pointer type.
             // * Any user-defined struct type that contains fields of unmanaged types only.
             var finalPointee = (pointee.GetFinalPointee() ?? pointee).Desugar();
-            if (finalPointee.IsPrimitiveType())
+            Enumeration @enum;
+            if (finalPointee.IsPrimitiveType() || finalPointee.TryGetEnum(out @enum))
             {
                 // Skip one indirection if passed by reference
                 bool isRefParam = Parameter != null && (Parameter.IsOut || Parameter.IsInOut);
@@ -220,18 +221,8 @@ namespace CppSharp.Generators.CSharp
                 var result = pointer.QualifiedPointee.Visit(this);
                 allowStrings = true;
 
-                return !isRefParam && result.Type == IntPtrType ? "void**" : result + "*";
-            }
-
-            Enumeration @enum;
-            if (pointee.TryGetEnum(out @enum))
-            {
-                // Skip one indirection if passed by reference
-                if (isManagedContext && Parameter != null && (Parameter.IsOut || Parameter.IsInOut)
-                    && pointee == finalPointee)
-                    return pointer.QualifiedPointee.Visit(this);
-
-                return pointer.QualifiedPointee.Visit(this) + "*";
+                string @ref = Parameter != null && Parameter.IsIndirect ? string.Empty : "*";
+                return !isRefParam && result.Type == this.IntPtrType ? "void**" : result + @ref;
             }
 
             Class @class;
@@ -738,8 +729,6 @@ namespace CppSharp.Generators.CSharp
 
         public override TypePrinterResult VisitFieldDecl(Field field)
         {
-            var cSharpSourcesDummy = new CSharpSources(Context, new List<TranslationUnit>());
-
             PushMarshalKind(MarshalKind.NativeField);
             var fieldTypePrinted = field.QualifiedType.Visit(this);
             PopMarshalKind();

src/Generator/Passes/CheckAbiParameters.cs

@@ -1,4 +1,6 @@
 using CppSharp.AST;
+using CppSharp.AST.Extensions;
+using System.Linq;
 
 namespace CppSharp.Passes
 {
@@ -79,7 +81,12 @@ namespace CppSharp.Passes
                 });
             }
 
-            // TODO: Handle indirect parameters
+            foreach (var param in from p in function.Parameters
+                                  where p.IsIndirect && !p.Type.Desugar().IsAddress()
+                                  select p)
+            {
+                param.QualifiedType = new QualifiedType(new PointerType(param.QualifiedType));
+            }
 
             return true;
         }

tests/Common/Common.Tests.cs

@@ -897,12 +897,14 @@ This is a very long string. This is a very long string. This is a very long stri
         }
     }
 
-    [Test, Ignore("Indirect parameters not supported yet")]
+    [Test]
     public void TestStructWithCopyCtorByValue()
     {
-        var structWithCopyCtor = new StructWithCopyCtor();
-        structWithCopyCtor.MBits = 10;
-        var ret = Common.TestStructWithCopyCtorByValue(structWithCopyCtor);
-        Assert.That(ret, Is.EqualTo(10));
+        using (var structWithCopyCtor = new StructWithCopyCtor())
+        {
+            structWithCopyCtor.MBits = 10;
+            var ret = Common.TestStructWithCopyCtorByValue(structWithCopyCtor);
+            Assert.That(ret, Is.EqualTo(10));
+        }
     }
 }