fix: incorrectly handle alias type of pointer in struct (#404)

internal/resolver/resolver.go

@@ -152,8 +152,8 @@ func resolveFields(vt reflect.Type) []FieldMeta {
         }
 
         /* get the index to the last offset */
-        fvt := fv.typ
         idx := len(path) - 1
+        fvt := path[idx].Type
 
         /* do not dereference into fields */
         if path[idx].Kind == F_deref {

issue_test/issuex403_test.go

@@ -0,0 +1,52 @@
+/**
+ * Copyright 2023 ByteDance Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package issue_test
+
+import (
+    `encoding/json`
+    `testing`
+
+    `github.com/bytedance/sonic`
+    `github.com/stretchr/testify/require`
+)
+
+type Issue403 struct {
+    Card   PtrAlias `json:"card"`
+}
+
+type PtrAlias *MarshalerImpl
+
+type MarshalerImpl struct{
+    A int
+}
+
+func (self *MarshalerImpl) MarshalJSON() ([]byte, error) {
+    return []byte("1"), nil
+}
+
+func TestIssue403(t *testing.T) {
+    obj := MarshalerImpl{0}
+    messageInfo := &Issue403{
+        Card:    &obj,
+    }
+
+    jsonData, err := json.Marshal(messageInfo)
+    require.NoError(t, err)
+    sonicData, err := sonic.Marshal(messageInfo)
+    require.NoError(t, err)
+    require.Equal(t, jsonData, sonicData)
+}