diff --git a/chore/_xtool/llcppsigfetch/llcppsigfetch.go b/chore/_xtool/llcppsigfetch/llcppsigfetch.go
index 19746b09..9c3cd6b3 100644
--- a/chore/_xtool/llcppsigfetch/llcppsigfetch.go
+++ b/chore/_xtool/llcppsigfetch/llcppsigfetch.go
@@ -22,7 +22,9 @@ import (
 	"os"
 	"path/filepath"
 	"strings"
+	"unsafe"
 
+	"github.com/goplus/llgo/c"
 	"github.com/goplus/llgo/chore/_xtool/llcppsigfetch/parse"
 	"github.com/goplus/llgo/chore/_xtool/llcppsymg/config"
 )
@@ -76,5 +78,7 @@ func getHeaderFiles(cflags string, files []string) []string {
 }
 
 func outputInfo(context *parse.Context) {
-	// TODO(zzy):
+	output := context.Output().Print()
+	defer c.Free(unsafe.Pointer(output))
+	c.Printf(output)
 }
diff --git a/chore/_xtool/llcppsigfetch/parse/cvt.go b/chore/_xtool/llcppsigfetch/parse/cvt.go
index be52e641..a87a7aed 100644
--- a/chore/_xtool/llcppsigfetch/parse/cvt.go
+++ b/chore/_xtool/llcppsigfetch/parse/cvt.go
@@ -8,12 +8,13 @@ import (
 	"unsafe"
 
 	"github.com/goplus/llgo/c"
+	"github.com/goplus/llgo/c/cjson"
 	"github.com/goplus/llgo/c/clang"
 	"github.com/goplus/llgo/chore/llcppg/ast"
 )
 
 type Converter struct {
-	files      map[string]*ast.File
+	Files      map[string]*ast.File
 	curLoc     ast.Location
 	curFile    *ast.File
 	index      *clang.Index
@@ -58,7 +59,7 @@ func NewConverter(file string, temp bool) (*Converter, error) {
 	}
 
 	return &Converter{
-		files: make(map[string]*ast.File),
+		Files: make(map[string]*ast.File),
 		index: index,
 		unit:  unit,
 	}, nil
@@ -112,7 +113,7 @@ func (ct *Converter) UpdateCurFile(cursor clang.Cursor) {
 	ct.curLoc = ast.Location{File: filePath}
 
 	if ct.curFile == nil || ct.curFile.Path != filePath {
-		if f, ok := ct.files[filePath]; ok {
+		if f, ok := ct.Files[filePath]; ok {
 			ct.curFile = f
 		} else {
 			ct.curFile = &ast.File{
@@ -121,7 +122,7 @@ func (ct *Converter) UpdateCurFile(cursor clang.Cursor) {
 				Includes: make([]*ast.Include, 0),
 				Macros:   make([]*ast.Macro, 0),
 			}
-			ct.files[filePath] = ct.curFile
+			ct.Files[filePath] = ct.curFile
 		}
 	}
 }
@@ -135,8 +136,9 @@ func (ct *Converter) CreateDeclBase(cursor clang.Cursor) ast.DeclBase {
 		commentGroup = ct.ParseComment(c.GoString(rawComment.CStr()))
 	}
 
+	loc := ct.curLoc
 	return ast.DeclBase{
-		Loc:    &ct.curLoc,
+		Loc:    &loc,
 		Parent: ct.GetCurScope(),
 		Doc:    commentGroup,
 	}
@@ -183,7 +185,7 @@ func (ct *Converter) Convert() (map[string]*ast.File, error) {
 	cursor := ct.unit.Cursor()
 	// visit top decls (struct,class,function & marco,include)
 	clang.VisitChildren(cursor, visit, c.Pointer(ct))
-	return ct.files, nil
+	return ct.Files, nil
 }
 
 func (ct *Converter) ProcessType(t clang.Type) ast.Expr {
@@ -395,6 +397,11 @@ func (ct *Converter) ProcessBuiltinType(t clang.Type) *ast.BuiltinType {
 		Flags: flags,
 	}
 }
+
+func (ct *Converter) MarshalASTFiles() *cjson.JSON {
+	return MarshalASTFiles(ct.Files)
+}
+
 func IsExplicitSigned(t clang.Type) bool {
 	return t.Kind == clang.TypeCharS || t.Kind == clang.TypeSChar
 }
diff --git a/chore/_xtool/llcppsigfetch/parse/cvt_test/decl_test/decl.go b/chore/_xtool/llcppsigfetch/parse/cvt_test/decl_test/decl.go
index 908fcc3e..bba657f6 100644
--- a/chore/_xtool/llcppsigfetch/parse/cvt_test/decl_test/decl.go
+++ b/chore/_xtool/llcppsigfetch/parse/cvt_test/decl_test/decl.go
@@ -38,7 +38,7 @@ func TestFuncDecl() {
 			panic(err)
 		}
 
-		json := converter.GetFilesJSON()
+		json := converter.MarshalASTFiles()
 		c.Printf(c.Str("TestFuncDecl Case %d:\n%s\n\n"), c.Int(i+1), json.Print())
 
 		converter.Dispose()
@@ -77,7 +77,7 @@ func TestScope() {
 			panic(err)
 		}
 
-		json := converter.GetFilesJSON()
+		json := converter.MarshalASTFiles()
 		c.Printf(c.Str("TestScope Case %d:\n%s\n\n"), c.Int(i+1), json.Print())
 
 		converter.Dispose()
@@ -123,7 +123,7 @@ void foo();`,
 			panic(err)
 		}
 
-		json := converter.GetFilesJSON()
+		json := converter.MarshalASTFiles()
 		c.Printf(c.Str("TestComment Case %d:\n%s\n\n"), c.Int(i+1), json.Print())
 
 		converter.Dispose()
@@ -157,7 +157,7 @@ func TestStructDecl() {
 			panic(err)
 		}
 
-		json := converter.GetFilesJSON()
+		json := converter.MarshalASTFiles()
 		c.Printf(c.Str("TestStructDecl Case %d:\n%s\n\n"), c.Int(i+1), json.Print())
 
 		converter.Dispose()
@@ -188,7 +188,7 @@ func TestClassDecl() {
 			panic(err)
 		}
 
-		json := converter.GetFilesJSON()
+		json := converter.MarshalASTFiles()
 		c.Printf(c.Str("TestClassDecl Case %d:\n%s\n\n"), c.Int(i+1), json.Print())
 
 		converter.Dispose()
diff --git a/chore/_xtool/llcppsigfetch/parse/dump.go b/chore/_xtool/llcppsigfetch/parse/dump.go
index e36f2617..c8c20c90 100644
--- a/chore/_xtool/llcppsigfetch/parse/dump.go
+++ b/chore/_xtool/llcppsigfetch/parse/dump.go
@@ -6,66 +6,73 @@ import (
 	"github.com/goplus/llgo/chore/llcppg/ast"
 )
 
-func (ct *Converter) GetFilesJSON() *cjson.JSON {
+func MarshalASTFiles(files map[string]*ast.File) *cjson.JSON {
 	root := cjson.Object()
-	for _, file := range ct.files {
-		root.SetItem(c.AllocaCStr(file.Path), ct.FileJSON(file))
+	for _, file := range files {
+		root.SetItem(c.AllocaCStr(file.Path), MarshalASTFile(file))
 	}
 	return root
 }
 
-func (ct *Converter) FileJSON(file *ast.File) *cjson.JSON {
+func MarshalASTFile(file *ast.File) *cjson.JSON {
 	root := cjson.Object()
 	decls := cjson.Array()
-	includes := cjson.Array()
-	macros := cjson.Array()
 
 	for _, decl := range file.Decls {
-		decls.AddItem(ct.DeclJSON(decl))
+		decls.AddItem(MarshalASTDecl(decl))
 	}
 
 	root.SetItem(c.Str("path"), cjson.String(c.AllocaCStr(file.Path)))
 	root.SetItem(c.Str("decls"), decls)
-	root.SetItem(c.Str("includes"), includes)
-	root.SetItem(c.Str("macros"), macros)
+
+	// json:includes,omitempty
+	if file.Includes != nil {
+		includes := cjson.Array()
+		root.SetItem(c.Str("includes"), includes)
+	}
+
+	// json:macros,omitempty
+	if file.Macros != nil {
+		macros := cjson.Array()
+		root.SetItem(c.Str("macros"), macros)
+	}
+
 	return root
 }
 
-func (ct *Converter) DeclJSON(decl ast.Decl) *cjson.JSON {
+func MarshalASTDecl(decl ast.Decl) *cjson.JSON {
 	if decl == nil {
 		return cjson.Null()
 	}
 	root := cjson.Object()
 	switch d := decl.(type) {
 	case *ast.FuncDecl:
-		ct.DeclBaseJSON(d.DeclBase, root)
-		root.SetItem(c.Str("Name"), ct.TypeJSON(d.Name))
-		root.SetItem(c.Str("Type"), ct.TypeJSON(d.Type))
+		MarshalASTDeclBase(d.DeclBase, root)
+		root.SetItem(c.Str("Name"), MarshalASTExpr(d.Name))
+		root.SetItem(c.Str("Type"), MarshalASTExpr(d.Type))
 	case *ast.TypeDecl:
-		ct.DeclBaseJSON(d.DeclBase, root)
+		MarshalASTDeclBase(d.DeclBase, root)
 		root.SetItem(c.Str("Tag"), cjson.Number(float64(d.Tag)))
-		root.SetItem(c.Str("Fields"), ct.TypeJSON(d.Fields))
+		root.SetItem(c.Str("Fields"), MarshalASTExpr(d.Fields))
 		methods := cjson.Array()
 		for _, m := range d.Methods {
-			methods.AddItem(ct.DeclJSON(m))
+			methods.AddItem(MarshalASTDecl(m))
 		}
 		root.SetItem(c.Str("Methods"), methods)
 	}
 	return root
 }
-func (ct *Converter) DeclBaseJSON(decl ast.DeclBase, root *cjson.JSON) {
-	if decl.Loc == nil {
-		root.SetItem(c.Str("Loc"), cjson.Null())
-	} else {
-		loc := cjson.Object()
-		loc.SetItem(c.Str("File"), cjson.String(c.AllocaCStr(decl.Loc.File)))
-		root.SetItem(c.Str("Loc"), loc)
-	}
-	root.SetItem(c.Str("Doc"), ct.TypeJSON(decl.Doc))
-	root.SetItem(c.Str("Parent"), ct.TypeJSON(decl.Parent))
+
+func MarshalASTDeclBase(decl ast.DeclBase, root *cjson.JSON) {
+	loc := cjson.Object()
+	loc.SetItem(c.Str("File"), cjson.String(c.AllocaCStr(decl.Loc.File)))
+	root.SetItem(c.Str("Loc"), loc)
+
+	root.SetItem(c.Str("Doc"), MarshalASTExpr(decl.Doc))
+	root.SetItem(c.Str("Parent"), MarshalASTExpr(decl.Parent))
 }
 
-func (ct *Converter) TypeJSON(t ast.Expr) *cjson.JSON {
+func MarshalASTExpr(t ast.Expr) *cjson.JSON {
 	if t == nil {
 		return cjson.Null()
 	}
@@ -74,24 +81,24 @@ func (ct *Converter) TypeJSON(t ast.Expr) *cjson.JSON {
 
 	switch d := t.(type) {
 	case *ast.FuncType:
-		root.SetItem(c.Str("Params"), ct.TypeJSON(d.Params))
-		root.SetItem(c.Str("Ret"), ct.TypeJSON(d.Ret))
+		root.SetItem(c.Str("Params"), MarshalASTExpr(d.Params))
+		root.SetItem(c.Str("Ret"), MarshalASTExpr(d.Ret))
 	case *ast.FieldList:
 		if d == nil {
 			return cjson.Null()
 		}
 		list := cjson.Array()
 		for _, f := range d.List {
-			list.AddItem(ct.TypeJSON(f))
+			list.AddItem(MarshalASTExpr(f))
 		}
 		root.SetItem(c.Str("List"), list)
 	case *ast.Field:
-		root.SetItem(c.Str("Type"), ct.TypeJSON(d.Type))
-		root.SetItem(c.Str("Doc"), ct.TypeJSON(d.Doc))
-		root.SetItem(c.Str("Comment"), ct.TypeJSON(d.Comment))
+		root.SetItem(c.Str("Type"), MarshalASTExpr(d.Type))
+		root.SetItem(c.Str("Doc"), MarshalASTExpr(d.Doc))
+		root.SetItem(c.Str("Comment"), MarshalASTExpr(d.Comment))
 		names := cjson.Array()
 		for _, n := range d.Names {
-			names.AddItem(ct.TypeJSON(n))
+			names.AddItem(MarshalASTExpr(n))
 		}
 		root.SetItem(c.Str("Names"), names)
 	case *ast.Ident:
@@ -100,10 +107,10 @@ func (ct *Converter) TypeJSON(t ast.Expr) *cjson.JSON {
 		root.SetItem(c.Str("Kind"), cjson.Number(float64(d.Kind)))
 		root.SetItem(c.Str("Value"), cjson.String(c.AllocaCStr(d.Value)))
 	case *ast.PointerType:
-		root.SetItem(c.Str("X"), ct.TypeJSON(d.X))
+		root.SetItem(c.Str("X"), MarshalASTExpr(d.X))
 	case *ast.ArrayType:
-		root.SetItem(c.Str("Elt"), ct.TypeJSON(d.Elt))
-		root.SetItem(c.Str("Len"), ct.TypeJSON(d.Len))
+		root.SetItem(c.Str("Elt"), MarshalASTExpr(d.Elt))
+		root.SetItem(c.Str("Len"), MarshalASTExpr(d.Len))
 	case *ast.BuiltinType:
 		root.SetItem(c.Str("Kind"), cjson.Number(float64(d.Kind)))
 		root.SetItem(c.Str("Flags"), cjson.Number(float64(d.Flags)))
@@ -115,12 +122,12 @@ func (ct *Converter) TypeJSON(t ast.Expr) *cjson.JSON {
 		}
 		list := cjson.Array()
 		for _, c := range d.List {
-			list.AddItem(ct.TypeJSON(c))
+			list.AddItem(MarshalASTExpr(c))
 		}
 		root.SetItem(c.Str("List"), list)
 	case *ast.ScopingExpr:
-		root.SetItem(c.Str("X"), ct.TypeJSON(d.X))
-		root.SetItem(c.Str("Parent"), ct.TypeJSON(d.Parent))
+		root.SetItem(c.Str("X"), MarshalASTExpr(d.X))
+		root.SetItem(c.Str("Parent"), MarshalASTExpr(d.Parent))
 	default:
 		return cjson.Null()
 	}
diff --git a/chore/_xtool/llcppsigfetch/parse/parse.go b/chore/_xtool/llcppsigfetch/parse/parse.go
index ce36a352..e7b3bee4 100644
--- a/chore/_xtool/llcppsigfetch/parse/parse.go
+++ b/chore/_xtool/llcppsigfetch/parse/parse.go
@@ -3,6 +3,8 @@ package parse
 import (
 	"errors"
 
+	"github.com/goplus/llgo/c"
+	"github.com/goplus/llgo/c/cjson"
 	"github.com/goplus/llgo/chore/llcppg/ast"
 )
 
@@ -16,6 +18,18 @@ func NewContext() *Context {
 	}
 }
 
+func (p *Context) Output() *cjson.JSON {
+	root := cjson.Array()
+	for path, file := range p.Files {
+		f := cjson.Object()
+		path := cjson.String(c.AllocaCStr(path))
+		f.SetItem(c.Str("path"), path)
+		f.SetItem(c.Str("doc"), MarshalASTFile(file))
+		root.AddItem(f)
+	}
+	return root
+}
+
 // ProcessFiles processes the given files and adds them to the context
 func (p *Context) ProcessFiles(files []string) error {
 	for _, file := range files {