Work around cgo (or Clang dwarf) bug with incorrect struct size

calculation by returning void pointers for NS object constructors.
Expand examples/app to start building menus.

examples/app/main.go

@@ -1,13 +1,16 @@
 package main
+//go:generate nswrap
 
 import (
+	"runtime"
 	"gitlab.wow.st/gmp/nswrap/examples/app/ns"
 )
 
-func main() {
+func nsmgr() {
+	//Lock OS thread because Cocoa uses thread-local storage
+	runtime.LockOSThread()
 	a := ns.NSApplicationSharedApplication()
 	a.SetActivationPolicy(ns.NSApplicationActivationPolicyRegular)
-	//w := ns.NSWindowAlloc()
 	w := ns.NSWindowAlloc().InitWithContentRect(
 		ns.NSMakeRect(200,200,600,600),
 		ns.NSWindowStyleMaskTitled,
@@ -17,6 +20,31 @@ func main() {
 	)
 	w.SetTitle(ns.NSStringWithGoString("Hi World"))
 	w.MakeKeyAndOrderFront(w)
+	w.SetAlphaValue(0.85)
+	m1 := ns.NSMenuAlloc().InitWithTitle(ns.NSStringWithGoString("Main"))
+	appItem := ns.NSMenuItemAlloc()
+	fileItem := ns.NSMenuItemAlloc()
+	m1.AddItem(appItem)
+	m1.AddItem(fileItem)
+
+	appMenu := ns.NSMenuAlloc().InitWithTitle(ns.NSStringWithGoString("App"))
+	fileMenu := ns.NSMenuAlloc().InitWithTitle(ns.NSStringWithGoString("File"))
+	m1.SetSubmenu(appMenu, appItem)
+	m1.SetSubmenu(fileMenu, fileItem)
+
+	s := ns.NSStringWithGoString("")
+	appMenu.AddItemWithTitle(ns.NSStringWithGoString("About"), nil, s)
+	appMenu.AddItemWithTitle(ns.NSStringWithGoString("Preferences"), nil, s)
+	a.SetMainMenu(m1)
+	fileMenu.AddItemWithTitle(ns.NSStringWithGoString("Open"), nil, s)
+	fileMenu.AddItemWithTitle(ns.NSStringWithGoString("New"), nil, s)
+
+	a.SetMainMenu(m1)
 	a.Run()
 }
 
+func main() {
+	go nsmgr()
+	select { }
+}
+

examples/app/nswrap.toml

@@ -19,13 +19,16 @@ Classes = [
 	"NSApplication",
 	"NSBundle",
 	"NSApp",
+	"NSMenu",
+	"NSMenuItem",
 	"NSWindow",
+	"NSView",
 	"NSScreen",
 	"NSEvent",
 	"NSResponder",
+	"NSRunLoop",
 ]
 Functions = [
-	"NSApplicationMain",
 	"NSMake.*",
 ]
 Enums = [
@@ -33,6 +36,8 @@ Enums = [
 	"NSApplication.*",
 	"NSBackingStore.*",
 	"NSWindowStyleMask.*",
+	"NSWindowButton",
+	"NSWindowOrderingMode",
 ]
 Frameworks = [ "Foundation", "AppKit", "CoreGraphics" ]
 Pragma = [ 'clang diagnostic ignored "-Wformat-security"' ]

types/node.go

@@ -138,3 +138,31 @@ func (n *Node) _Ctype(ignore map[string]bool) string {
 	return s
 }
 
+
+func (n *Node) Qualifiers() string {
+	if n == nil {
+		return ""
+	}
+	ret := []string{}
+	for _,c := range n.Children {
+		switch c.Kind {
+		case "TypeQualifier":
+			ret = append(ret,c.Content)
+		}
+	}
+	return strings.Join(ret," ")
+}
+
+func (n *Node) Annotations() string {
+	if n == nil {
+		return ""
+	}
+	ret := []string{}
+	for _,c := range n.Children {
+		switch c.Kind {
+		case "NullableAnnotation":
+			ret = append(ret,c.Content)
+		}
+	}
+	return strings.Join(ret," ")
+}

wrap/main.go

@@ -556,6 +556,10 @@ func (w *Wrapper) ProcessMethod(m *Method) {
 }
 
 func (w *Wrapper) ProcessFunction(m *Method) {
+	if m.Type.Node.IsId() {
+	//do not wrap functions that return ID because of CGo struct size bug
+		return
+	}
 	w._processMethod(m,true)
 }
 
@@ -572,6 +576,7 @@ func (w *Wrapper) _processMethod(m *Method,fun bool) {
 	case m.Type.GoType() != "*" + m.GoClass:
 		gname = m.GoClass + gname
 	default:
+		//Shorten class method names
 		lens1 := len(m.Class)
 		i := 0
 		if len(gname) < len(m.Class) { i = lens1 - len(gname) }
@@ -592,8 +597,19 @@ func (w *Wrapper) _processMethod(m *Method,fun bool) {
 	if m.Class != "" {
 		cname = m.Class + "_" + cname
 	}
-
+	var cmtype string
-	cmtype := m.Type.CTypeAttrib()
+	if m.Type.IsPointer() {
+		// work around cgo bugs with struct size calculation
+		cmtype = "void*"
+		if x := m.Type.Node.Qualifiers(); x != "" {
+			cmtype = x + " " + cmtype
+		}
+		if x := m.Type.Node.Annotations(); x != "" {
+			cmtype = cmtype + " " + x
+		}
+	} else {
+		cmtype = m.Type.CTypeAttrib()
+	}
 	ns,tps,gplist := w.gpntp(m)
 	grtype := m.Type.GoType()
 	if grtype == "Void" {
@@ -755,11 +771,11 @@ func %sAlloc() *%s {
 `,i.GoName,i.GoName,i.GoName,i.Name))
 
 		w.cCode.WriteString(fmt.Sprintf(`
-%s*
+void*
 %sAlloc() {
 	return [%s alloc];
 }
-`, i.Name, i.Name, i.Name))
+`, i.Name, i.Name))
 
 		//FIXME: sort properties
 		for _,p := range i.Properties {