[WIP] ssa: python support kwargs

ssa/package.go

@@ -181,6 +181,7 @@ type aProgram struct {
 	callNoArgs   *types.Signature
 	callOneArg   *types.Signature
 	callFOArgs   *types.Signature
+	callArgs     *types.Signature
 	loadPyModS   *types.Signature
 	getAttrStr   *types.Signature
 	pyUniStr     *types.Signature

ssa/python.go

@@ -76,6 +76,14 @@ func (p Package) pyFunc(fullName string, sig *types.Signature) Expr {
 	return p.NewFunc(fullName, sig, InC).Expr
 }
 
+func (p Package) pyGoFunc(fnName string) Expr {
+	p.NeedPyInit = true
+	fn := p.Prog.python().Scope().Lookup(fnName).(*types.Func)
+	name := FullName(fn.Pkg(), fnName)
+	sig := fn.Type().(*types.Signature)
+	return p.NewFunc(name, sig, InGo).Expr
+}
+
 func (p Program) paramObjPtr() *types.Var {
 	if p.paramObjPtr_ == nil {
 		objPtr := p.PyObjectPtr().raw.Type
@@ -126,7 +134,6 @@ func (p Program) tyCallFunctionObjArgs() *types.Signature {
 	return p.callFOArgs
 }
 
-/*
 // func(*Object, *Object, *Object) *Object
 func (p Program) tyCall() *types.Signature {
 	if p.callArgs == nil {
@@ -137,7 +144,6 @@ func (p Program) tyCall() *types.Signature {
 	}
 	return p.callArgs
 }
-*/
 
 // func(*Object, uintptr, *Object) cint
 func (p Program) tyListSetItem() *types.Signature {
@@ -342,6 +348,10 @@ func (b Builder) PyLoadModSyms(modName string, objs ...PyObjRef) Expr {
 	return b.Call(fnLoad, args...)
 }
 
+const (
+	pyKwargs = "github.com/goplus/lib/py.Kwargs"
+)
+
 func (b Builder) pyCall(fn Expr, args []Expr) (ret Expr) {
 	prog := b.Prog
 	pkg := b.Pkg
@@ -360,6 +370,16 @@ func (b Builder) pyCall(fn Expr, args []Expr) (ret Expr) {
 		}
 		fallthrough
 	default:
+		if sig.Variadic() {
+			if params := sig.Params(); params.At(params.Len()-1).Name() == NameValist &&
+				len(args) >= params.Len() && args[len(args)-1].Type.RawType().String() == pyKwargs {
+				kwargs := b.Call(b.Pkg.pyGoFunc("KwargsToDict"), args[len(args)-1])
+				call := pkg.pyFunc("PyObject_Call", prog.tyCall())
+				ret = b.Call(call, fn, b.PyTuple(args[:len(args)-1]...), kwargs)
+				return
+			}
+		}
+
 		call := pkg.pyFunc("PyObject_CallFunctionObjArgs", prog.tyCallFunctionObjArgs())
 		n = len(args)
 		callargs := make([]Expr, n+2)