diff --git a/chore/_xtool/llcppsigfetch/parse/cvt.go b/chore/_xtool/llcppsigfetch/parse/cvt.go
index 806db4ee..ac04b414 100644
--- a/chore/_xtool/llcppsigfetch/parse/cvt.go
+++ b/chore/_xtool/llcppsigfetch/parse/cvt.go
@@ -12,11 +12,13 @@ import (
 
 type Converter struct {
 	files   map[string]*ast.File
-	typeMap map[clang.Type]*ast.Expr
-	declMap map[clang.Cursor]*ast.Decl
+	typeMap map[clang.Type]ast.Expr // todo(zzy):maybe a other map key for typemap is better
+	declMap map[clang.Cursor]ast.Decl
 	curLoc  ast.Location
+	curFile *ast.File
 	index   *clang.Index
 	unit    *clang.TranslationUnit
+	// todo(zzy):current namespace expr
 }
 
 func NewConverter(filepath string) (*Converter, error) {
@@ -37,8 +39,8 @@ func NewConverter(filepath string) (*Converter, error) {
 	}
 
 	return &Converter{
-		typeMap: make(map[clang.Type]*ast.Expr),
-		declMap: make(map[clang.Cursor]*ast.Decl),
+		typeMap: make(map[clang.Type]ast.Expr),
+		declMap: make(map[clang.Cursor]ast.Decl),
 		files:   make(map[string]*ast.File),
 		index:   index,
 		unit:    unit,
@@ -52,6 +54,7 @@ func (ct *Converter) Dispose() {
 
 // visit top decls (struct,class,function,enum & marco,include)
 func visit(cursor, parent clang.Cursor, clientData unsafe.Pointer) clang.ChildVisitResult {
+	// todo(zzy): set current file
 	ct := (*Converter)(clientData)
 	switch cursor.Kind {
 	case clang.CursorInclusionDirective:
@@ -78,8 +81,56 @@ func visit(cursor, parent clang.Cursor, clientData unsafe.Pointer) clang.ChildVi
 	}
 }
 
+func (ct *Converter) ProcessType(t clang.Type) ast.Expr {
+	// todo(zzy):a other map key for typemap
+	if cache, ok := ct.typeMap[t]; ok {
+		return cache
+	}
+	var expr ast.Expr
+	switch t.Kind {
+	case clang.TypePointer:
+		expr = &ast.PointerType{X: ct.ProcessType(t.PointeeType())}
+	case clang.TypeFunctionProto:
+		ret := ct.ProcessType(t.ResultType())
+		params := &ast.FieldList{}
+		for i := 0; i < int(t.NumArgTypes()); i++ {
+			argType := ct.ProcessType(t.ArgType(c.Uint(i)))
+			params.List = append(params.List, &ast.Field{Type: argType})
+			// todo(zzy):field name
+		}
+		expr = &ast.FuncType{Params: params, Ret: ret}
+	case clang.TypeTypedef:
+		expr = ct.ProcessType(t.CanonicalType())
+	case clang.TypeConstantArray, clang.TypeVariableArray, clang.TypeIncompleteArray, clang.TypeDependentSizedArray:
+		expr = &ast.ArrayType{
+			Elt: ct.ProcessType(t.ArrayElementType()),
+		}
+		// todo(zzy):array length
+	}
+	ct.typeMap[t] = expr
+	return expr
+}
+
 func (ct *Converter) ProcessFunc(cursor clang.Cursor) {
-	println("todo: Process func")
+	name := cursor.String()
+	defer name.Dispose()
+
+	funcType, ok := ct.ProcessType(cursor.Type()).(*ast.FuncType)
+	if !ok {
+		fmt.Println("failed to process function type")
+		return
+	}
+
+	fn := &ast.FuncDecl{
+		Name: &ast.Ident{Name: c.GoString(name.CStr())},
+		Type: funcType,
+		// todo(zzy):DeclBase use the converter's current namespace expr
+	}
+
+	decls := ct.GetCurFile()
+	decls.Decls = append(decls.Decls, fn)
+
+	ct.declMap[cursor] = fn
 }
 
 func (ct *Converter) ProcessClass(cursor clang.Cursor) {
@@ -96,3 +147,7 @@ func (ct *Converter) Convert() (map[string]*ast.File, error) {
 func (ct *Converter) UpdateLocation(loc ast.Location) {
 	ct.curLoc = loc
 }
+
+func (ct *Converter) GetCurFile() *ast.File {
+	return ct.curFile
+}