diff --git a/version3.0/nasal_ast.h b/version3.0/nasal_ast.h
index 3f496c8..671cf42 100644
--- a/version3.0/nasal_ast.h
+++ b/version3.0/nasal_ast.h
@@ -117,13 +117,8 @@ void nasal_ast::print_ast(int depth)
     for(int i=0;i<depth;++i) indentation+="|  ";
     indentation+=ast_str(this->type);
     std::cout<<indentation;
-    switch(this->type)
-    {
-        case ast_number:    std::cout<<":"<<this->str;break;
-        case ast_string:    std::cout<<":"<<this->str;break;
-        case ast_identifier:std::cout<<":"<<this->str;break;
-        case ast_call_hash: std::cout<<":"<<this->str;break;
-    }
+    if(this->type==ast_number || this->type==ast_string || this->type==ast_identifier || this->type==ast_dynamic_id || this->type==ast_call_hash)
+        std::cout<<":"<<this->str;
     std::cout<<std::endl;
     int child_size=this->children.size();
     for(int i=0;i<child_size;++i)
diff --git a/version3.0/nasal_gc.h b/version3.0/nasal_gc.h
index a93c7b3..c6b24d0 100644
--- a/version3.0/nasal_gc.h
+++ b/version3.0/nasal_gc.h
@@ -47,16 +47,21 @@ class nasal_function
 {
 private:
     // this int points to the space in nasal_vm::garbage_collector_memory
+    bool is_builtin;
     int closure_addr;
     nasal_ast argument_list;
     nasal_ast function_expr;
 public:
     nasal_function();
     ~nasal_function();
+    void set_builtin_func();
+    bool check_builtin();
     void set_closure_addr(int);
     int  get_closure_addr();
     void set_arguments(nasal_ast&);
+    nasal_ast& get_arguments();
     void set_run_block(nasal_ast&);
+    nasal_ast& get_run_block();
     void deepcopy(nasal_function&);
 };
 
@@ -267,19 +272,53 @@ void nasal_hash::del_elem(std::string key)
 }
 int nasal_hash::get_value_address(std::string key)
 {
+    int ret_value_addr=-1;
     if(elems.find(key)!=elems.end())
         return nasal_vm.mem_get(elems[key]);
-    else
-        std::cout<<">> [vm] nasal_hash:get_value_address: "<<key<<" does not exist."<<std::endl;
-    return -1;
+    else if(elems.find("parents")!=elems.end())
+    {
+        int mem_addr=elems["parents"];
+        int val_addr=nasal_vm.mem_get(mem_addr);
+        if(nasal_vm.gc_get(val_addr).get_type()==vm_vector)
+        {
+            nasal_vector& vec_ref=nasal_vm.gc_get(val_addr).get_vector();
+            int size=vec_ref.size();
+            for(int i=0;i<size;++i)
+            {
+                int tmp_val_addr=vec_ref.get_value_address(i);
+                if(nasal_vm.gc_get(tmp_val_addr).get_type()==vm_hash)
+                    ret_value_addr=nasal_vm.gc_get(tmp_val_addr).get_hash().get_value_address(key);
+                if(ret_value_addr>=0)
+                    break;
+            }
+        }
+    }
+    return ret_value_addr;
 }
 int nasal_hash::get_mem_address(std::string key)
 {
+    int ret_mem_addr=-1;
     if(elems.find(key)!=elems.end())
         return elems[key];
-    else
-        std::cout<<">> [vm] nasal_hash:get_mem_address: "<<key<<" does not exist."<<std::endl;
-    return -1;
+    else if(elems.find("parents")!=elems.end())
+    {
+        int mem_addr=elems["parents"];
+        int val_addr=nasal_vm.mem_get(mem_addr);
+        if(nasal_vm.gc_get(val_addr).get_type()==vm_vector)
+        {
+            nasal_vector& vec_ref=nasal_vm.gc_get(val_addr).get_vector();
+            int size=vec_ref.size();
+            for(int i=0;i<size;++i)
+            {
+                int tmp_val_addr=vec_ref.get_value_address(i);
+                if(nasal_vm.gc_get(tmp_val_addr).get_type()==vm_hash)
+                    ret_mem_addr=nasal_vm.gc_get(tmp_val_addr).get_hash().get_mem_address(key);
+                if(ret_mem_addr>=0)
+                    break;
+            }
+        }
+    }
+    return ret_mem_addr;
 }
 void nasal_hash::deepcopy(nasal_hash& tmp)
 {
@@ -298,6 +337,7 @@ void nasal_hash::deepcopy(nasal_hash& tmp)
 /*functions of nasal_function*/
 nasal_function::nasal_function()
 {
+    is_builtin=false;
     closure_addr=-1;
     argument_list.clear();
     function_expr.clear();
@@ -311,6 +351,15 @@ nasal_function::~nasal_function()
     function_expr.clear();
     return;
 }
+void nasal_function::set_builtin_func()
+{
+    is_builtin=true;
+    return;
+}
+bool nasal_function::check_builtin()
+{
+    return is_builtin;
+}
 void nasal_function::set_closure_addr(int value_address)
 {
     closure_addr=value_address;
@@ -325,11 +374,19 @@ void nasal_function::set_arguments(nasal_ast& node)
     argument_list=node;
     return;
 }
+nasal_ast& nasal_function::get_arguments()
+{
+    return argument_list;
+}
 void nasal_function::set_run_block(nasal_ast& node)
 {
     function_expr=node;
     return;
 }
+nasal_ast& nasal_function::get_run_block()
+{
+    return function_expr;
+}
 void nasal_function::deepcopy(nasal_function& tmp)
 {
     this->closure_addr=nasal_vm.gc_alloc();
diff --git a/version3.0/nasal_parse.h b/version3.0/nasal_parse.h
index 98119b1..8bba1e7 100644
--- a/version3.0/nasal_parse.h
+++ b/version3.0/nasal_parse.h
@@ -347,6 +347,7 @@ nasal_ast nasal_parse::hash_member_gen()
     if(ptr>=tok_list_size || (tok_list[ptr].type!=tok_identifier && tok_list[ptr].type!=tok_string))
     {
         error_info(error_line,lack_identifier);
+        ++error;
         return node;
     }
     node.set_line(tok_list[ptr].line);
diff --git a/version3.0/nasal_runtime.h b/version3.0/nasal_runtime.h
index 5f42693..241562d 100644
--- a/version3.0/nasal_runtime.h
+++ b/version3.0/nasal_runtime.h
@@ -51,7 +51,7 @@ private:
     int call_scalar(nasal_ast&,int);
     int call_vector(nasal_ast&,int,int);
     int call_hash(nasal_ast&,int,int);
-    int call_function(nasal_ast&,int,int);
+    int call_function(nasal_ast&,int,int,int);
     // get scalars' memory place in complex data structure like vector/hash/function/closure(scope)
     int call_scalar_mem(nasal_ast&,int);
     int call_vector_mem(nasal_ast&,int,int);
@@ -173,9 +173,16 @@ int nasal_runtime::function_generation(nasal_ast& node,int local_scope_addr)
     ref_of_this_function.set_run_block(node.get_children()[1]);
     if(local_scope_addr>=0)
     {
+        // codes here make closure
         nasal_vm.add_reference(local_scope_addr);
         ref_of_this_function.set_closure_addr(local_scope_addr);
     }
+    else
+    {
+        int new_closure_addr=nasal_vm.gc_alloc();
+        nasal_vm.gc_get(new_closure_addr).set_type(vm_closure);
+        ref_of_this_function.set_closure_addr(new_closure_addr);
+    }
     return new_addr;
 }
 int nasal_runtime::main_progress()
@@ -229,6 +236,9 @@ int nasal_runtime::main_progress()
             case ast_continue:
                 ret_state=rt_continue;
                 break;
+            case ast_return:
+                ret_state=rt_return;
+                break;
         }
         switch(ret_state)
         {
@@ -240,6 +250,10 @@ int nasal_runtime::main_progress()
                 std::cout<<">> [runtime] main_progress: cannot use continue in main progress."<<std::endl;
                 ++error;
                 break;
+            case rt_return:
+                std::cout<<">> [runtime] main_progress: cannot use return in main progress."<<std::endl;
+                ++error;
+                break;
             case rt_error:
                 std::cout<<">> [runtime] main_progress: error occurred when executing main progress."<<std::endl;
                 ++error;
@@ -312,13 +326,17 @@ int nasal_runtime::block_progress(nasal_ast& node,int local_scope_addr)
             case ast_continue:
                 ret_state=rt_continue;
                 break;
+            case ast_return:
+                ret_state=rt_return;
+                function_returned_address=calculation(root.get_children()[i].get_children()[0],local_scope_addr);
+                break;
         }
         if(ret_state==rt_error)
         {
             std::cout<<">> [runtime] block_progress: error occurred when executing sub-progress."<<std::endl;
             ++error;
         }
-        if(error)
+        if(error || ret_state==rt_break || ret_state==rt_continue || ret_state==rt_return)
             break;
     }
     nasal_vm.del_reference(local_scope_addr);
@@ -354,15 +372,25 @@ int nasal_runtime::call_scalar(nasal_ast& node,int local_scope_addr)
     }
     nasal_vm.add_reference(value_address);
     int call_expr_size=node.get_children().size();
+    int last_call_hash_addr=-1;
     for(int i=1;i<call_expr_size;++i)
     {
         int tmp_value_addr=-1;
         nasal_ast& call_expr=node.get_children()[i];
         switch(call_expr.get_type())
         {
-            case ast_call_vec:tmp_value_addr=call_vector(call_expr,value_address,local_scope_addr);break;
-            case ast_call_hash:tmp_value_addr=call_hash(call_expr,value_address,local_scope_addr);break;
-            case ast_call_func:tmp_value_addr=call_function(call_expr,value_address,local_scope_addr);break;
+            case ast_call_vec:
+                tmp_value_addr=call_vector(call_expr,value_address,local_scope_addr);
+                last_call_hash_addr=-1;
+                break;
+            case ast_call_hash:
+                tmp_value_addr=call_hash(call_expr,value_address,local_scope_addr);
+                last_call_hash_addr=value_address;
+                break;
+            case ast_call_func:
+                tmp_value_addr=call_function(call_expr,value_address,last_call_hash_addr,local_scope_addr);
+                last_call_hash_addr=-1;
+                break;
         }
         nasal_vm.del_reference(value_address);
         value_address=tmp_value_addr;
@@ -636,16 +664,41 @@ int nasal_runtime::call_hash(nasal_ast& node,int base_value_addr,int local_scope
     nasal_vm.add_reference(ret_value_addr);
     return ret_value_addr;
 }
-int nasal_runtime::call_function(nasal_ast& node,int base_value_addr,int local_scope_addr)
+int nasal_runtime::call_function(nasal_ast& node,int base_value_addr,int last_call_hash_addr,int local_scope_addr)
 {
+    int ret_value_addr=-1;
     int value_type=nasal_vm.gc_get(base_value_addr).get_type();
     if(value_type!=vm_function)
     {
         std::cout<<">> [runtime] call_function: incorrect value type,expected a function."<<std::endl;
         return -1;
     }
+    nasal_function& reference_of_func=nasal_vm.gc_get(base_value_addr).get_func();
+    int run_closure_addr=reference_of_func.get_closure_addr();
+    nasal_closure& run_closure=nasal_vm.gc_get(run_closure_addr).get_closure();
+    run_closure.add_scope();
+    nasal_vm.add_reference(last_call_hash_addr);
+    run_closure.add_new_value("me",last_call_hash_addr);
     // unfinished
-    return -1;
+    nasal_ast& argument_format=reference_of_func.get_arguments();
+    if(!node.get_children().size())
+    {
+        ;
+    }
+    else if(node.get_children()[0].get_type()==ast_hashmember)
+    {
+        ;
+    }
+    else
+    {
+        ;
+    }
+    int ret_state=block_progress(reference_of_func.get_run_block(),run_closure_addr); //?
+
+    run_closure.del_scope();
+    ret_value_addr=function_returned_address;
+    function_returned_address=-1;
+    return ret_value_addr;
 }
 int nasal_runtime::call_scalar_mem(nasal_ast& node,int local_scope_addr)
 {