Fix code generation

gir/cmd/gir-generate/gendata/gendata.go

@@ -406,8 +406,8 @@ func GLibVariantIter(nsgen *girgen.NamespaceGenerator) error {
 			_variant := (*Variant)(gextras.NewStructNative(unsafe.Pointer(_cret)))
 			runtime.AddCleanup(
 				gextras.StructIntern(unsafe.Pointer(_variant)),
-				C.g_variant_unref,
-				(*C.GVariant)(unsafe.Pointer(_cret)),
+				func(ptr unsafe.Pointer) { C.g_variant_unref((*C.GVariant)(ptr)) },
+				unsafe.Pointer(_cret),
 			)
 			return _variant, nil
 		}
@@ -429,8 +429,8 @@ func GLibVariantIter(nsgen *girgen.NamespaceGenerator) error {
 				variant := (*Variant)(gextras.NewStructNative(unsafe.Pointer(item)))
 				runtime.AddCleanup(
 					gextras.StructIntern(unsafe.Pointer(variant)),
-					C.g_variant_unref,
-					(*C.GVariant)(unsafe.Pointer(item)),
+					func(ptr unsafe.Pointer) { C.g_variant_unref((*C.GVariant)(ptr)) },
+					unsafe.Pointer(item),
 				)
 
 				return variant
@@ -563,8 +563,8 @@ func GioArrayUseBytes(nsgen *girgen.NamespaceGenerator) error {
 			_bytes := (*Bytes)(gextras.NewStructNative(unsafe.Pointer(v)))
 			runtime.AddCleanup(
 				gextras.StructIntern(unsafe.Pointer(_bytes)),
-				C.g_bytes_unref,
-				(*C.GBytes)(unsafe.Pointer(v)),
+				func(ptr unsafe.Pointer) { C.g_bytes_unref((*C.GBytes)(ptr)) },
+				unsafe.Pointer(v),
 			)
 
 			return _bytes

gir/girgen/types/typeconv/c-go.go

@@ -431,14 +431,15 @@ func (conv *Converter) cgoConverter(value *ValueConverted) bool {
 		value.header.NeedsExternGLib()
 		value.header.NeedsGLibObject()
 
-		value.p.LineTmpl(value, `<.Out.Set> =
-			<- .OutPtr 1>coreglib.ValueFromNative(unsafe.Pointer(<.InNamePtr 1>))`)
-
-		// Set this to be freed if we have the ownership now.
+		valueFunc := "ValueFromNative"
 		if value.ShouldFree() {
-			value.header.Import("runtime")
-			value.p.Linef("runtime.AddCleanup(%s, C.g_value_unset, (*C.GValue)(unsafe.Pointer(v.Native())))", value.OutName)
+			valueFunc = "ValueFromNativeOwned"
 		}
+
+		value.p.Printf("%s =", value.Out.Set)
+		value.p.Printf("  %scoreglib.%s(unsafe.Pointer(%s))", value.OutPtr(1), valueFunc, value.InNamePtr(1))
+		value.p.EmptyLine()
+
 		return true
 
 	case "GObject.Object", "GObject.InitiallyUnowned":
@@ -498,11 +499,11 @@ func (conv *Converter) cgoConverter(value *ValueConverted) bool {
 			value.p.Linef("C.%s(%s)", ref, value.InNamePtr(1))
 		}
 
-		value.p.Linef("runtime.AddCleanup(%s%s, func(v %s%s) {",
-			value.OutInPtr(1), value.OutName, value.OutPtr(1), value.Out.Type)
-		value.p.Linef("C.%s((%s%s)(unsafe.Pointer(v.Native())))",
-			unref, value.InPtr(1), value.In.Type)
-		value.p.Linef("}, %s%s)", value.OutInPtr(1), value.OutName)
+		value.p.Linef("runtime.AddCleanup(")
+		value.p.Linef("  %s%s,", value.OutInPtr(1), value.OutName)
+		value.p.Linef("  func(p unsafe.Pointer) { C.%s((%s%s)(p)) },", unref, value.InPtr(1), value.In.Type)
+		value.p.Linef("  unsafe.Pointer(%s),", value.InNamePtr(1))
+		value.p.Linef(")")
 
 		return true
 	}
@@ -640,9 +641,7 @@ func (conv *Converter) cgoConverter(value *ValueConverted) bool {
 			value.header.Import("runtime")
 			value.p.Linef("runtime.AddCleanup(")
 			value.p.Linef("  gextras.StructIntern(unsafe.Pointer(%s%s)),", value.OutInPtr(1), value.OutName)
-			value.p.Linef("  func(ptr unsafe.Pointer) {")
-			value.p.Linef("    %s", types.RecordPrintFree(value.conv.fgen, value.Resolved.Extern, "ptr"))
-			value.p.Linef("  },")
+			value.p.Linef("  func(ptr unsafe.Pointer) { %s },", types.RecordPrintFree(value.conv.fgen, value.Resolved.Extern, "ptr"))
 			value.p.Linef("  unsafe.Pointer(%s),", value.InNamePtr(1))
 			value.p.Linef(")")
 		}

pkg/core/glib/glib.go

@@ -1045,11 +1045,20 @@ func InitValue(t Type) *Value {
 	return v
 }
 
-// ValueFromNative returns a type-asserted pointer to the Value. It does not add
-// a finalizer into the Value. This function should only be used for
-// autogenerated bindings.
+// ValueFromNative returns a type-asserted pointer to the Value.
+// This should only be used by the code generator.
 func ValueFromNative(l unsafe.Pointer) *Value {
-	return &Value{&value{(*C.GValue)(l)}}
+	v := &Value{&value{(*C.GValue)(l)}}
+	return v
+}
+
+// ValueFromNativeOwned returns a type-asserted pointer to the Value, with a
+// finalizer set to call g_value_unset() on the underlying GValue. This should
+// only be used by the code generator.
+func ValueFromNativeOwned(l unsafe.Pointer) *Value {
+	v := ValueFromNative(l)
+	runtime.AddCleanup(v.value, func(v *C.GValue) { C.g_value_unset(v) }, v.gvalue)
+	return v
 }
 
 // NewValue converts a Go type to a comparable GValue. It will panic if the