feat: Add transitions for fix-sized arrays

core/src/fr/hammons/slinc/SetSizeArray.scala

@@ -44,6 +44,10 @@ class SetSizeArray[A, B <: Int] private[slinc] (private val array: Array[A])
       value: A
   )(using 0 <= C =:= true, C < B =:= true): Unit = array(constValue[C]) = value
 
+  def zip[C](oArr: SetSizeArray[C, B]): SetSizeArray[(A, C), B] =
+    new SetSizeArray[(A, C), B](array.zip(oArr.array))
+  def foreach(fn: A => Unit) = array.foreach(fn)
+
 object SetSizeArray:
   class SetSizeArrayBuilderUnsafe[B <: Int]:
     def apply[A](array: Array[A]): SetSizeArray[A, B] = new SetSizeArray(array)

core/src/fr/hammons/slinc/TypeDescriptor.scala

@@ -239,9 +239,20 @@ case class SetSizeArrayDescriptor(
   override val argumentTransition
       : (TransitionModule, ReadWriteModule, Allocator) ?=> ArgumentTransition[
         Inner
-      ] = ???
+      ] = arg =>
+    val mem = summon[Allocator].allocate(this, 1)
+    summon[ReadWriteModule].write(
+      mem,
+      Bytes(0),
+      this,
+      arg
+    )
+    mem.asAddress
 
   override val returnTransition
-      : (TransitionModule, ReadWriteModule) ?=> ReturnTransition[Inner] = ???
+      : (TransitionModule, ReadWriteModule) ?=> ReturnTransition[Inner] =
+    obj =>
+      val mem = summon[TransitionModule].addressReturn(obj)
+      summon[ReadWriteModule].read(mem, Bytes(0), this)
 
   type Inner = SetSizeArray[contained.Inner, ?]

core/test/resources/native/test.c

@@ -139,3 +139,12 @@ EXPORTED struct_issue_175 i175_test(struct_issue_175 a, char left) {
   }
   return a;
 }
+
+EXPORTED int* i180_test(int my_array[5]) {
+  int i = 0;
+  while(i < 5) {
+    my_array[i] = my_array[i] * 2;
+    i++;
+  }
+  return my_array;
+}

core/test/src/fr/hammons/slinc/BindingSpec.scala

@@ -59,6 +59,10 @@ trait BindingSpec(val slinc: Slinc) extends ScalaCheckSuite:
         left: CChar
     ): I175_Struct
 
+    def i180_test(
+        input: SetSizeArray[CInt, 5]
+    ): SetSizeArray[CInt, 5]
+
   test("int_identity") {
     val test = FSet.instance[TestLib]
 
@@ -186,3 +190,11 @@ trait BindingSpec(val slinc: Slinc) extends ScalaCheckSuite:
           union.set(double)
           val res = test.i175_test(I175_Struct(union), 0)
           assertEquals(res.union.get[CDouble], double / 2)
+
+  property("issue 180 - can send and receive set size arrays to C functions"):
+      val test = FSet.instance[TestLib]
+      forAll(Gen.listOfN(5, Arbitrary.arbitrary[CInt])): list =>
+        val arr = SetSizeArray.fromArrayUnsafe[5](list.toArray)
+        val retArr = test.i180_test(arr)
+
+        retArr.zip(arr.map(_ * 2)).foreach(assertEquals(_, _))

core/test/src/fr/hammons/slinc/TransferSpec.scala

@@ -10,6 +10,7 @@ import scala.concurrent.Await
 import scala.concurrent.duration.Duration
 import scala.concurrent.ExecutionContext.Implicits.global
 import scala.reflect.ClassTag
+import scala.util.chaining.*
 
 trait TransferSpec[ThreadException <: Throwable](val slinc: Slinc)(using
     ClassTag[ThreadException]
@@ -28,7 +29,7 @@ trait TransferSpec[ThreadException <: Throwable](val slinc: Slinc)(using
 
   case class F(u: CUnion[(CInt, CFloat)]) derives Struct
 
-  case class G(arr: SetSizeArray[CLong, 2]) derives Struct
+  case class G(long: CLong, arr: SetSizeArray[CLong, 2]) derives Struct
 
   test("can read and write jvm ints") {
     Scope.global {
@@ -162,20 +163,16 @@ trait TransferSpec[ThreadException <: Throwable](val slinc: Slinc)(using
     }
   }
 
-  test("varargs can be sent and retrieved"):
+  test("varargs can receive primitive types"):
       Scope.confined {
-        val vaListForVaList = VarArgsBuilder(4).build
         val vaList = VarArgsBuilder(
           4.toByte,
           5.toShort,
           6,
           7.toLong,
           2f,
           3d,
-          Null[Int],
-          A(1, 2),
-          CLong(4: Byte),
-          vaListForVaList
+          Null[Int]
         ).build
 
         assertEquals(vaList.get[Byte], 4.toByte, "byte assert")
@@ -185,24 +182,118 @@ trait TransferSpec[ThreadException <: Throwable](val slinc: Slinc)(using
         assertEquals(vaList.get[Float], 2f, "float assert")
         assertEquals(vaList.get[Double], 3d, "double assert")
         assertEquals(
-          vaList.get[Ptr[Int]].mem.asAddress,
-          Null[Int].mem.asAddress,
+          vaList.get[Ptr[Int]],
+          Null[Int],
           "ptr assert"
         )
+      }
+
+  test("varargs can receive complex types".ignore):
+      Scope.confined {
+        val vaListForVaList = VarArgsBuilder(4).build
+        val vaList = VarArgsBuilder(
+          A(1, 2),
+          CLong(4),
+          A(3, 4),
+          SetSizeArray(1, 2, 3, 4),
+          vaListForVaList,
+          CUnion[(CInt, CFloat)].tap(_.set(5)),
+          // Null[Int],
+          A(3, 4)
+        ).build
+
         assertEquals(vaList.get[A], A(1, 2), "struct assert")
         assertEquals(vaList.get[CLong], CLong(4: Byte), "alias assert")
-        assertEquals(vaList.get[VarArgs].get[CInt], 4)
+        assertEquals(vaList.get[A], A(3, 4))
+        assertEquals(
+          vaList.get[SetSizeArray[CInt, 4]].toSeq,
+          Seq(1, 2, 3, 4),
+          "set size array assert"
+        )
+        assertEquals(
+          vaListForVaList.get[VarArgs].get[Int],
+          4
+        )
+        assertEquals(
+          vaList.get[CUnion[(CLongLong, CFloat)]].get[CLongLong],
+          5L,
+          "cunion assert"
+        )
+        // assertEquals(
+        //   vaList.get[Ptr[Int]],
+        //   Null[Int]
+        // )
+        assertEquals(
+          vaList.get[A],
+          A(3, 4),
+          "struct assert 2"
+        )
       }
 
-  test("varargs can be skipped"):
+  test("varargs can skip primitive types"):
       Scope.confined {
         val vaList = VarArgsBuilder(
-          4.toByte,
-          2f
+          4: Byte,
+          5: Short,
+          6,
+          7L,
+          2f,
+          3d,
+          Null[Int]
         ).build
 
+        val vaList2 = vaList.copy()
+
         vaList.skip[Byte]
-        assertEquals(vaList.get[Float], 2f)
+        assertEquals(vaList.get[Short], 5: Short)
+        vaList.skip[Int]
+        assertEquals(vaList.get[Long], 7L)
+        vaList.skip[Float]
+        assertEquals(vaList.get[Double], 3d)
+        vaList.skip[Ptr[Int]]
+
+        assertEquals(vaList2.get[Byte], 4: Byte)
+        vaList2.skip[Short]
+        assertEquals(vaList2.get[Int], 6)
+        vaList2.skip[Long]
+        assertEquals(vaList2.get[Float], 2f)
+        vaList2.skip[Double]
+        assertEquals(vaList2.get[Ptr[Int]], Null[Int])
+      }
+
+  test("varargs can skip complex types".ignore):
+      Scope.confined {
+        val vaListForVaList = VarArgsBuilder(4, 5, 6).build
+        val vaList = VarArgsBuilder(
+          A(1, 2),
+          CLong(4),
+          vaListForVaList,
+          CUnion[(CInt, CFloat)].tap(_.set(5)),
+          SetSizeArray(1, 2, 3, 4)
+        ).build
+
+        val vaList2 = vaList.copy()
+
+        assertEquals(vaList.get[A], A(1, 2), "struct assert")
+        vaList.skip[CLong]
+        val vaList3 = vaList.get[VarArgs]
+        assertEquals(
+          List(vaList3.get[Int], vaList3.get[Int], vaList3.get[Int]),
+          List(4, 5, 6),
+          "varargs assert"
+        )
+        vaList.skip[CUnion[(CInt, CFloat)]]
+        assertEquals(
+          vaList.get[SetSizeArray[Int, 4]].toSeq,
+          Seq(1, 2, 3, 4),
+          "set size array assert"
+        )
+
+        vaList2.skip[A]
+        assertEquals(vaList2.get[CLong], CLong(4))
+        vaList2.skip[VarArgs]
+        assertEquals(vaList2.get[CUnion[(CInt, CFloat)]].get[Int], 5)
+        vaList2.skip[SetSizeArray[Int, 4]]
       }
 
   test("varargs can be copied and reread"):
@@ -373,7 +464,7 @@ trait TransferSpec[ThreadException <: Throwable](val slinc: Slinc)(using
       }
 
   test("can copy G to native memory and back"):
-      val g = G(SetSizeArray(CLong(1), CLong(2)))
+      val g = G(CLong(5), SetSizeArray(CLong(1), CLong(2)))
 
       Scope.confined {
         val ptr = Ptr.copy(g)

j17/src/fr/hammons/slinc/Allocator17.scala

@@ -122,6 +122,15 @@ object Allocator17:
           case ms: MemorySegment => ms
           case _ => throw Error("base of mem was not J17 MemorySegment!!")
       )
+    case (ssad: SetSizeArrayDescriptor, s: SetSizeArray[?, ?]) =>
+      LinkageModule17.tempScope(alloc ?=>
+        builder.vargFromAddress(
+          C_POINTER,
+          transitionModule17
+            .methodArgument(ssad, s, alloc)
+            .asInstanceOf[Addressable]
+        )
+      )
     case (a, d) =>
       throw Error(
         s"Unsupported type descriptor/data pairing for VarArgs: $a - $d"

j17/src/fr/hammons/slinc/VarArgs17.scala

@@ -3,6 +3,7 @@ package fr.hammons.slinc
 import jdk.incubator.foreign.CLinker.VaList
 import jdk.incubator.foreign.CLinker.{C_INT, C_LONG_LONG, C_DOUBLE, C_POINTER}
 import jdk.incubator.foreign.SegmentAllocator
+import jdk.incubator.foreign.GroupLayout
 import fr.hammons.slinc.modules.{
   LinkageModule17,
   descriptorModule17,
@@ -20,7 +21,8 @@ class VarArgs17(args: VaList) extends VarArgs:
       case LongDescriptor   => Long.box(args.vargAsLong(C_LONG_LONG))
       case FloatDescriptor  => Float.box(args.vargAsDouble(C_DOUBLE).toFloat)
       case DoubleDescriptor => Double.box(args.vargAsDouble(C_DOUBLE))
-      case PtrDescriptor    => args.vargAsAddress(C_POINTER).nn
+      case PtrDescriptor | _: SetSizeArrayDescriptor | VaListDescriptor =>
+        args.vargAsAddress(C_POINTER).nn
       case sd: StructDescriptor =>
         LinkageModule17.tempScope(alloc ?=>
           args
@@ -30,26 +32,34 @@ class VarArgs17(args: VaList) extends VarArgs:
             )
             .nn
         )
-      case AliasDescriptor(real)           => get(real)
-      case VaListDescriptor                => args.vargAsAddress(C_POINTER).nn
-      case CUnionDescriptor(possibleTypes) => get(possibleTypes.maxBy(_.size))
+      case AliasDescriptor(real) => get(real)
+      case cud: CUnionDescriptor =>
+        LinkageModule17.tempScope(alloc ?=>
+          args
+            .vargAsSegment(
+              descriptorModule17.toMemoryLayout(cud).asInstanceOf[GroupLayout],
+              alloc.base.asInstanceOf[SegmentAllocator]
+            )
+            .nn
+        )
   def get[A](using d: DescriptorOf[A]): A =
     transitionModule17.methodReturn[A](d.descriptor, get(d.descriptor))
 
   private def skip(td: TypeDescriptor): Unit =
     td match
-      case ByteDescriptor   => args.skip(C_INT)
-      case ShortDescriptor  => args.skip(C_INT)
-      case IntDescriptor    => args.skip(C_INT)
-      case LongDescriptor   => args.skip(C_LONG_LONG)
-      case FloatDescriptor  => args.skip(C_DOUBLE)
-      case DoubleDescriptor => args.skip(C_DOUBLE)
-      case PtrDescriptor    => args.skip(C_POINTER)
+      case ByteDescriptor                            => args.skip(C_INT)
+      case ShortDescriptor                           => args.skip(C_INT)
+      case IntDescriptor                             => args.skip(C_INT)
+      case LongDescriptor                            => args.skip(C_LONG_LONG)
+      case FloatDescriptor                           => args.skip(C_DOUBLE)
+      case DoubleDescriptor                          => args.skip(C_DOUBLE)
+      case PtrDescriptor | _: SetSizeArrayDescriptor => args.skip(C_POINTER)
       case sd: StructDescriptor =>
         args.skip(descriptorModule17.toGroupLayout(sd))
-      case AliasDescriptor(real)           => skip(real)
-      case VaListDescriptor                => args.skip(C_POINTER)
-      case CUnionDescriptor(possibleTypes) => skip(possibleTypes.maxBy(_.size))
+      case AliasDescriptor(real) => skip(real)
+      case VaListDescriptor      => args.skip(C_POINTER)
+      case cud: CUnionDescriptor =>
+        args.skip(descriptorModule17.toMemoryLayout(cud))
 
   def skip[A](using dO: DescriptorOf[A]): Unit = skip(dO.descriptor)
 

j17/src/fr/hammons/slinc/modules/DescriptorModule17.scala

@@ -8,7 +8,8 @@ import jdk.incubator.foreign.{
   MemorySegment,
   GroupLayout,
   CLinker,
-  ValueLayout
+  ValueLayout,
+  SequenceLayout
 }, CLinker.C_POINTER
 import scala.collection.concurrent.TrieMap
 import fr.hammons.slinc.types.{arch, os, OS, Arch}
@@ -26,11 +27,10 @@ given descriptorModule17: DescriptorModule with
     case FloatDescriptor  => classOf[Float]
     case DoubleDescriptor => classOf[Double]
     case PtrDescriptor    => classOf[MemoryAddress]
-    case _: StructDescriptor | _: CUnionDescriptor |
-        _: SetSizeArrayDescriptor =>
+    case _: StructDescriptor | _: CUnionDescriptor =>
       classOf[MemorySegment]
-    case VaListDescriptor       => classOf[MemoryAddress]
-    case ad: AliasDescriptor[?] => toCarrierType(ad.real)
+    case VaListDescriptor | _: SetSizeArrayDescriptor => classOf[MemoryAddress]
+    case ad: AliasDescriptor[?]                       => toCarrierType(ad.real)
 
   def genLayoutList(
       layouts: Seq[MemoryLayout],
@@ -123,6 +123,11 @@ given descriptorModule17: DescriptorModule with
     case CUnionDescriptor(possibleTypes) =>
       MemoryLayout.unionLayout(possibleTypes.map(toMemoryLayout).toSeq*).nn
 
+  def toDowncallLayout(td: TypeDescriptor): MemoryLayout = toMemoryLayout(
+    td
+  ) match
+    case _: SequenceLayout => C_POINTER.nn
+    case o                 => o
   def toMemoryLayout(smd: StructMemberDescriptor): MemoryLayout =
     toMemoryLayout(smd.descriptor).withName(smd.name).nn
 

j17/src/fr/hammons/slinc/modules/LinkageModule17.scala

@@ -26,11 +26,11 @@ object LinkageModule17 extends LinkageModule:
       varArgs.view.map(_.use[DescriptorOf](d ?=> _ => d.descriptor))
     val fdConstructor = descriptor.returnDescriptor match
       case None        => FunctionDescriptor.ofVoid(_*)
-      case Some(value) => FunctionDescriptor.of(toMemoryLayout(value), _*)
+      case Some(value) => FunctionDescriptor.of(toDowncallLayout(value), _*)
 
     val fd = fdConstructor(
       descriptor.inputDescriptors.view
-        .map(toMemoryLayout)
+        .map(toDowncallLayout)
         .concat(variadicDescriptors.map(toMemoryLayout).map(CLinker.asVarArg))
         .toSeq
     )

j19/src/fr/hammons/slinc/Allocator19.scala

@@ -112,6 +112,16 @@ class Allocator19(
             case ms: MemorySegment => ms
             case _                 => throw Error("Illegal datatype")
         )
+
+      case (ssad: SetSizeArrayDescriptor, s: SetSizeArray[?, ?]) =>
+        LinkageModule19.tempScope(alloc ?=>
+          builder.addVarg(
+            ValueLayout.ADDRESS,
+            transitionModule19
+              .methodArgument(ssad, s, alloc)
+              .asInstanceOf[Addressable]
+          )
+        )
       case (td, d) =>
         throw Error(s"Unsupported datatype for $td - $d")