From 309a57070c816af10ca8556ee84fb9523b927096 Mon Sep 17 00:00:00 2001
From: ValKmjolnir <lhk101lhk101@qq.com>
Date: Tue, 15 Nov 2022 21:23:34 +0800
Subject: [PATCH] :rocket: change module loading

---
 README.md            |  26 ++-
 doc/README_zh.md     |  27 +--
 lib.nas              | 514 -------------------------------------------
 module/fib.cpp       |  15 +-
 module/keyboard.cpp  |  18 +-
 module/libfib.nas    |   4 +-
 module/libkey.nas    |   6 +-
 module/libmat.nas    |  42 ++--
 module/libsock.nas   |  24 +-
 module/matrix.cpp    |  72 +++---
 module/nasocket.cpp  |  45 ++--
 nasal_builtin.h      |  36 ++-
 nasal_gc.h           |   6 +-
 stl/lib.nas          |   4 +-
 test/module_test.nas |   8 +-
 15 files changed, 154 insertions(+), 693 deletions(-)
 delete mode 100644 lib.nas

diff --git a/README.md b/README.md
index edffdb5..46b5506 100644
--- a/README.md
+++ b/README.md
@@ -631,16 +631,20 @@ var fib(var* args,usize size,gc* ngc){
     return {vm_num,fibonaci(num.tonum())};
 }
 
+// then put function name and address into this table
+// make sure the end of the table is {nullptr,nullptr}
+mod_func func_tbl[]={
+    {"fib",fib},
+    {nullptr,nullptr}
+};
+
 // must write this function, this will help nasal to
 // get the function pointer by name
 // the reason why using this way to get function pointer
 // is because `var` has constructors, which is not compatiable in C
 // so "extern "C" var fib" may get compilation warnings
-extern "C" mod get(const char* n){
-    string name=n;
-    if(name=="fib")
-        return fib;
-    return nullptr;
+extern "C" mod_func get(){
+    return func_tbl;
 }
 ```
 
@@ -664,15 +668,13 @@ Then we write a test nasal file to run this fib function, using `os.platform()`
 
 ```javascript
 var dlhandle=dylib.dlopen("libfib."~(os.platform()=="windows"?"dll":"so"));
-var fib=dylib.dlsym(dlhandle,"fib");
+var fib=dlhandle.fib;
 for(var i=1;i<30;i+=1)
     println(dylib.dlcall(fib,i));
-dylib.dlclose(dlhandle);
+dylib.dlclose(dlhandle.lib);
 ```
 
-`dylib.dlopen` is used to load dynamic library.
-
-`dylib.dlsym` is used to get the function address.
+`dylib.dlopen` is used to load dynamic library and get the function address.
 
 `dylib.dlcall` is used to call the function, the first argument is the function address, make sure this argument is `vm_obj` and `type=obj_extern`.
 
@@ -682,11 +684,11 @@ dylib.dlclose(dlhandle);
 
 ```javascript
 var dlhandle=dylib.dlopen("libfib."~(os.platform()=="windows"?"dll":"so"));
-var fib=dylib.dlsym(dlhandle,"fib");
+var fib=dlhandle.fib;
 var invoke=dylib.limitcall(1); # this means the called function has only one parameter
 for(var i=1;i<30;i+=1)
     println(invoke(fib,i));
-dylib.dlclose(dlhandle);
+dylib.dlclose(dlhandle.lib);
 ```
 
 If get this, Congratulations!
diff --git a/doc/README_zh.md b/doc/README_zh.md
index 4a4624c..249d828 100644
--- a/doc/README_zh.md
+++ b/doc/README_zh.md
@@ -604,15 +604,18 @@ var fib(var* args,usize size,gc* ngc){
     return {vm_num,fibonaci(num.tonum())};
 }
 
+// 然后将函数名字和函数地址放到一个表里，一定要记住表尾是{nullptr,nullptr}
+mod_func func_tbl[]={
+    {"fib",fib},
+    {nullptr,nullptr}
+};
+
 // 必须实现这个函数, 这样nasal可以通过字符串名字获得函数指针
 // 之所以用这种方式来获取函数指针, 是因为`var`是有构造函数的
 // 有构造函数的类型作为返回值, 和C是不兼容的, 这导致
 // 类似 "extern "C" var fib" 的写法会得到编译错误
-extern "C" mod get(const char* n){
-    string name=n;
-    if(name=="fib")
-        return fib;
-    return nullptr;
+extern "C" mod_func get(){
+    return func_tbl;
 }
 ```
 
@@ -637,15 +640,13 @@ Windows(`.dll`):
 
 ```javascript
 var dlhandle=dylib.dlopen("libfib."~(os.platform()=="windows"?"dll":"so"));
-var fib=dylib.dlsym(dlhandle,"fib");
+var fib=dlhandle.fib;
 for(var i=1;i<30;i+=1)
     println(dylib.dlcall(fib,i));
-dylib.dlclose(dlhandle);
+dylib.dlclose(dlhandle.lib);
 ```
 
-`dylib.dlopen`用于加载动态库。
-
-`dylib.dlsym`通过符号从动态库中获得函数地址。
+`dylib.dlopen`用于加载动态库并从动态库中获得函数地址。
 
 `dylib.dlcall`用于调用函数，第一个参数是动态库函数的地址，这是个特殊类型，一定要保证这个参数是`vm_obj`类型并且`type=obj_extern`。
 
@@ -655,11 +656,11 @@ dylib.dlclose(dlhandle);
 
 ```javascript
 var dlhandle=dylib.dlopen("libfib."~(os.platform()=="windows"?"dll":"so"));
-var fib=dylib.dlsym(dlhandle,"fib");
-var invoke=dylib.limitcall(1); # 这说明我们要调用的函数只有一个参数
+var fib=dlhandle.fib;
+var invoke=dylib.limitcall(1); # this means the called function has only one parameter
 for(var i=1;i<30;i+=1)
     println(invoke(fib,i));
-dylib.dlclose(dlhandle);
+dylib.dlclose(dlhandle.lib);
 ```
 
 如果接下来你看到了这个运行结果，恭喜你！
diff --git a/lib.nas b/lib.nas
deleted file mode 100644
index 295d964..0000000
--- a/lib.nas
+++ /dev/null
@@ -1,514 +0,0 @@
-# lib.nas
-# 2019 ValKmjolnir
-
-# print is used to print all things in nasal, try and see how it works.
-# this function uses std::cout to output logs.
-var print=func(elems...){
-    return __print(elems);
-}
-
-# append is used to add values into a vector.
-var append=func(vec,elems...){
-    return __append(vec,elems);
-}
-
-# setsize is used to change the size of vector.
-# if the size is larger than before,
-# this function will fill vm_nil into uninitialized space.
-var setsize=func(vec,size){
-    return __setsize(vec,size);
-}
-
-# system has the same use in C.
-var system=func(str){
-    return __system(str);
-}
-
-# input uses std::cin and returns what we input.
-var input=func(end=nil){
-    return __input(end);
-}
-
-# split a string by separator for example:
-# split("ll","hello world") -> ["he","o world"]
-# this function will return a vector.
-var split=func(separator,str){
-    return __split(separator,str);
-}
-
-# rand has the same function as the rand in C
-# if seed is nil, it will return the random number.
-# if seed is not nil, it will be initialized by this seed.
-var rand=func(seed=nil){
-    return __rand(seed);
-}
-
-# id will return the pointer of an gc-object.
-# if this object is not managed by gc, it will return 0.
-var id=func(object){
-    return __id(object);
-}
-
-# int will get the integer of input number/string.
-# but carefully use it, because int has range between -2147483648~2147483647
-var int=func(val){
-    return __int(val);
-}
-
-# floor will get the integral number of input argument
-# which is less than or equal to this argument
-var floor=func(val){
-    return __floor(val);
-}
-
-# exit using std::exit
-var exit=func(val=-1){
-    return __exit(val);
-}
-
-# abort using std::abort
-var abort=func(){
-    __abort();
-}
-
-# abs gets absolute number.
-var abs=func(n){
-    return n>0?n:-n;
-}
-
-# num will change all the other types into number.
-# mostly used to change a numerable string.
-var num=func(val){
-    return __num(val);
-}
-
-# pop used to pop the last element in a vector.
-# this function will return the value that poped if vector has element(s).
-# if the vector is empty, it will return nil.
-var pop=func(vec){
-    return __pop(vec);
-}
-
-# str is used to change number into string.
-var str=func(num){
-    return __str(num);
-}
-
-# size can get the size of a string/vector/hashmap.
-# in fact it can also get the size of number, and the result is the number itself.
-# so don't do useless things, though it really works.
-var size=func(object){
-    return __size(object);
-}
-
-# contains is used to check if a key exists in a hashmap/dict.
-var contains=func(hash,key){
-    return __contains(hash,key);
-}
-
-# delete is used to delete a pair in a hashmap/dict by key.
-var delete=func(hash,key){
-    return __delete(hash,key);
-}
-
-# keys is used to get all keys in a hashmap/dict.
-# this function will return a vector.
-var keys=func(hash){
-    return __keys(hash);
-}
-
-# time has the same function in C.
-var time=func(begin){
-    return __time(begin);
-}
-var systime=func(){
-    return time(0);
-}
-
-# die is a special native function.
-# use it at where you want the program to crash immediately.
-var die=func(str){
-    return __die(str);
-}
-
-# find will give the first position of the needle in haystack
-var find=func(needle,haystack){
-    return __find(needle,haystack);
-}
-
-# typeof is used to get the type of an object.
-# this function returns a string.
-var typeof=func(object){
-    return __type(object);
-}
-
-# subvec is used to get part of a vector
-var subvec=func(vec,begin,length=nil){
-    return vec[begin:(length==nil?nil:begin+length-1)];
-}
-
-# substr will get the sub-string.
-# it gets the string, the begin index and sub-string's length as arguments.
-var substr=func(str,begin,len){
-    return __substr(str,begin,len);
-}
-
-# streq is used to compare if two strings are the same.
-var streq=func(a,b){
-    return __streq(a,b);
-}
-
-# left is used to get the sub-string like substr.
-# but the begin index is 0.
-var left=func(str,len){
-    return __left(str,len);
-}
-
-# right i used to get the sub-string like substr.
-# but the begin index is strlen-len.
-var right=func(str,len){
-    return __right(str,len);
-}
-
-# cmp is used to compare two strings.
-# normal string will not be correctly compared by operators < > <= >=
-# because these operators will turn strings into numbers then compare.
-var cmp=func(a,b){
-    return __cmp(a,b);
-}
-
-# chr is used to get the character by ascii-number.
-# for example chr(65) -> 'A'
-var chr=func(code){
-    return __chr(code);
-}
-
-# char will give you the real character of ascii-number
-# instead of extend-ascii when number between 128~256
-var char=func(code){
-    return __char(code);
-}
-
-# mut is used to change unmutable strings to mutable.
-var mut=func(str){
-    return str~"";
-}
-
-# srand wraps up rand, using time(0) as the seed.
-var srand=func(){
-    rand(time(0));
-    return 0;
-}
-
-# values() gets all values in a hash.
-var values=func(hash){
-    return __values(hash);
-}
-
-# println has the same function as print.
-# but it will output a '\n' after using print.
-var println=func(elems...){
-    return __println(elems);
-}
-
-var isfunc=func(f){
-    return typeof(f)=="func";
-}
-
-var isghost=func(g){
-    die("this runtime has no ghost object");
-    return 0;
-}
-
-var ishash=func(h){
-    return typeof(h)=="hash";
-}
-
-var isint=func(x){
-    return x==floor(x);
-}
-
-var isnum=func(x){
-    return typeof(x)=="num" or !math.isnan(num(x));
-}
-
-var isscalar=func(s){
-    var t=typeof(s);
-    return (t=="num" or t=="str")?1:0;
-}
-
-var isstr=func(s){
-    return typeof(s)=="str";
-}
-
-var isvec=func(v){
-    return typeof(v)=="vec";
-}
-
-
-# get the index of val in the vec
-var vecindex=func(vec,val){
-    forindex(var i;vec)
-        if(val==vec[i])
-            return i;
-    return nil;
-}
-
-# check if the object is an instance of the class
-var isa=func(object,class){
-    if(!contains(object,"parents") or typeof(object.parents)!="vec")
-        return 0;
-    foreach(var elem;object.parents)
-        if(elem==class)
-            return 1;
-    return 0;
-}
-
-# assert aborts when condition is not true
-var assert=func(condition,message="assertion failed!"){
-    if(condition)
-        return 1;
-    die(message);
-}
-
-# get time stamp, this will return a timestamp object
-var maketimestamp=func(){
-    var t=0;
-    return {
-        stamp:func(){t=__millisec();},
-        elapsedMSec:func(){return __millisec()-t;},
-        elapsedUSec:func(){return (__millisec()-t)*1000;}
-    };
-}
-
-# md5
-var md5=func(str){
-    return __md5(str);
-}
-
-var io={
-    SEEK_SET:0,
-    SEEK_CUR:1,
-    SEEK_END:2,
-    # get content of a file by filename. returns a string.
-    fin:   func(filename){return __fin(filename);},
-    # input a string as the content of a file.
-    fout:  func(filename,str){return __fout(filename,str);},
-    # use C access
-    exists:func(filename){return __exists(filename);},
-    # same as C fopen. open file and get the FILE*.
-    open:  func(filename,mode="r"){return __open(filename,mode);},
-    # same as C fclose. close file by FILE*.
-    close: func(filehandle){return __close(filehandle);},
-    # same as C fread. read file by FILE*.
-    # caution: buf must be a mutable string.use mut("") to get an empty mutable string.
-    read:  func(filehandle,buf,len){return __read(filehandle,buf,len);},
-    # same as C fwrite. write file by FILE*.
-    write: func(filehandle,str){return __write(filehandle,str);},
-    # same as C fseek. seek place by FILE*.
-    seek:  func(filehandle,pos,whence){return __seek(filehandle,pos,whence);},
-    # same as C ftell.
-    tell:  func(filehandle){return __tell(filehandle);},
-    # read file by lines. use FILE*.
-    # get nil if EOF
-    readln:func(filehandle){return __readln(filehandle);},
-    # same as C stat.
-    stat:  func(filename){return __stat(filename);},
-    # same as C feof. check if FILE* gets the end of file(EOF).
-    eof:   func(filehandle){return __eof(filehandle);}
-};
-
-# get file status. using data from io.stat
-var fstat=func(filename){
-    var s=io.stat(filename);
-    return {
-        st_dev:  s[0],
-        st_ino:  s[1],
-        st_mode: s[2],
-        st_nlink:s[3],
-        st_uid:  s[4],
-        st_gid:  s[5],
-        st_rdev: s[6],
-        st_size: s[7],
-        st_atime:s[8],
-        st_mtime:s[9],
-        st_ctime:s[10]
-    };
-}
-
-# functions that do bitwise calculation.
-# carefully use it, all the calculations are based on integer.
-var bits={
-    # i32 xor
-    i32_xor: func(a,b){return __i32xor(a,b); },
-    # i32 and
-    i32_and: func(a,b){return __i32and(a,b); },
-    # i32 or
-    i32_or:  func(a,b){return __i32or(a,b);  },
-    # i32 nand
-    i32_nand:func(a,b){return __i32nand(a,b);},
-    # i32 not
-    i32_not: func(a)  {return __i32not(a);   },
-    # u32 xor
-    u32_xor: func(a,b){return __u32xor(a,b); },
-    # u32 and
-    u32_and: func(a,b){return __u32and(a,b); },
-    # u32 or
-    u32_or:  func(a,b){return __u32or(a,b);  },
-    # u32 nand
-    u32_nand:func(a,b){return __u32nand(a,b);},
-    # u32 not
-    u32_not: func(a)  {return __u32not(a);   },
-
-    # get bit data from a special string. for example:
-    # bits.fld(s,0,3);
-    # if s stores 10100010(162)
-    # will get 101(5).
-    fld:     func(str,startbit,len){return __fld;},
-    # get sign-extended data from a special string. for example:
-    # bits.sfld(s,0,3);
-    # if s stores 10100010(162)
-    # will get 101(5) then this will be signed extended to
-    # 11111101(-3).
-    sfld:    func(str,startbit,len){return __sfld;},
-    # set value into a special string to store it. little-endian, for example:
-    # bits.setfld(s,0,8,69);
-    # set 01000101(69) to string will get this:
-    # 10100010(162)
-    # so s[0]=162.
-    setfld:  func(str,startbit,len,val){return __setfld;},
-    # get a special string filled by '\0' to use in setfld.
-    buf:     func(len){return __buf;}
-};
-
-# mostly used math functions and special constants, you know.
-var math={
-    e:     2.7182818284590452354,
-    pi:    3.14159265358979323846264338327950288,
-    D2R:   2.7182818284590452354/180,
-    R2D:   180/2.7182818284590452354,
-    inf:   1/0,
-    nan:   0/0,
-    abs:   func(x)  {return x>0?x:-x;    },
-    floor: func(x)  {return __floor(x);  },
-    pow:   func(x,y){return __pow(x,y);  },
-    sin:   func(x)  {return __sin(x);    },
-    cos:   func(x)  {return __cos(x);    },
-    tan:   func(x)  {return __tan(x);    },
-    exp:   func(x)  {return __exp(x);    },
-    lg:    func(x)  {return __lg(x);     },
-    ln:    func(x)  {return __ln(x);     },
-    sqrt:  func(x)  {return __sqrt(x);   },
-    atan2: func(x,y){return __atan2(x,y);},
-    isnan: func(x)  {return __isnan(x);  },
-    max:   func(x,y){return x>y?x:y;     },
-    min:   func(x,y){return x<y?x:y;     }
-};
-
-var unix={
-    pipe:     func(){return __pipe;},
-    fork:     func(){return __fork;},
-    dup2:     func(fd0,fd1){die("not supported yet");},
-    exec:     func(filename,argv,envp){die("not supported yet");},
-    waitpid:  func(pid,nohang=0){return __waitpid;},
-    isdir:    func(path){return !!bits.u32_and(io.stat(path)[2],0x4000);}, # S_IFDIR 0x4000
-    isfile:   func(path){return !!bits.u32_and(io.stat(path)[2],0x8000);}, # S_IFREG 0x8000
-    opendir:  func(path){return __opendir;},
-    readdir:  func(handle){return __readdir;},
-    closedir: func(handle){return __closedir;},
-    time:     func(){return time(0);},
-    sleep:    func(secs){return __sleep(secs);},
-    chdir:    func(path){return __chdir(path);},
-    environ:  func(){return __environ();},
-    getcwd:   func(){return __getcwd();},
-    getenv:   func(envvar){return __getenv(envvar);},
-    getpath:  func(){return split(os.platform()=="windows"?";":":",unix.getenv("PATH"));}
-};
-
-# dylib is the core hashmap for developers to load their own library.
-# for safe using dynamic library, you could use 'module' in stl/module.nas
-var dylib={
-    # open dynamic lib.
-    dlopen:  func(libname){
-        # find dynamic lib from local dir first
-        libname=(os.platform()=="windows"?".\\":"./")~libname;
-        if(io.exists(libname))
-            return __dlopen(libname);
-        # find dynamic lib through PATH
-        var envpath=split(os.platform()=="windows"?";":":",unix.getenv("PATH"));
-        # first find ./module
-        append(envpath,".");
-        var path=os.platform()=="windows"?"\\module\\":"/module/";
-        foreach(var p;envpath){
-            p~=path~libname;
-            if(io.exists(p)){
-                libname=p;
-                break;
-            }
-        }
-        return __dlopen(libname);
-    },
-    # load symbol from an open dynamic lib.
-    dlsym:   func(lib,sym){return __dlsym; },
-    # close dynamic lib, this operation will make all the symbols loaded from it invalid.
-    dlclose: func(lib){return __dlclose;   },
-    # call the loaded symbol, with infinite parameters:
-    # Caution: this may cause garbage collection process, be aware of the performance.
-    dlcall:  func(ptr,args...){return __dlcallv},
-    # get dlcall function with limited parameter list
-    limitcall: func(arg_size=0){
-        if(arg_size==0){return func(ptr){return __dlcall};}
-        else if(arg_size==1){return func(ptr,_0){return __dlcall};}
-        else if(arg_size==2){return func(ptr,_0,_1){return __dlcall};}
-        else if(arg_size==3){return func(ptr,_0,_1,_2){return __dlcall};}
-        else if(arg_size==4){return func(ptr,_0,_1,_2,_3){return __dlcall};}
-        else if(arg_size==5){return func(ptr,_0,_1,_2,_3,_4){return __dlcall};}
-        else if(arg_size==6){return func(ptr,_0,_1,_2,_3,_4,_5){return __dlcall};}
-        else if(arg_size==7){return func(ptr,_0,_1,_2,_3,_4,_5,_6){return __dlcall};}
-        else if(arg_size==8){return func(ptr,_0,_1,_2,_3,_4,_5,_6,_7){return __dlcall};}
-        else{return func(ptr,args...){return __dlcallv};}
-    }
-};
-
-# os is used to use or get some os-related info/functions.
-# windows/macOS/linux are supported.
-var os={
-    # get a string that tell which os it runs on.
-    platform: func(){return __platform;},
-    time:     func(){return __logtime; }
-};
-
-# runtime gives us some functions that we could manage it manually.
-var runtime={
-    # command line arguments
-    argv: func(){return __sysargv;}
-};
-
-# functions that not supported in this runtime:
-var bind=func(function,locals,outer_scope=nil){
-    die("this runtime does not support bind");
-}
-
-var call=func(function,args=nil,_me=nil,locals=nil,error=nil){
-    die("this runtime does not support call");
-}
-
-var caller=func(level=1){
-    die("this runtime does not support caller");
-}
-
-var closure=func(function,level=1){
-    die("this runtime uses \"vm_upval\" instead of \"vm_hash\" as the closure");
-}
-
-var compile=func(code,filename="<compile>"){
-    die("this runtime uses static code generator");
-}
-
-var coroutine={
-    create: func(function){return __cocreate;},
-    resume: func(co)      {return __coresume;},
-    yield:  func(args...) {return __coyield; },
-    status: func(co)      {return __costatus;},
-    running:func()        {return __corun;   }
-};
diff --git a/module/fib.cpp b/module/fib.cpp
index c4a3771..c99b5ff 100644
--- a/module/fib.cpp
+++ b/module/fib.cpp
@@ -29,11 +29,12 @@ var quick_fib(var* args,usize size,gc* ngc){
     return {vm_num,res};
 }
 
-extern "C" mod get(const char* n){
-    string name=n;
-    if(name=="fib")
-        return fib;
-    else if(name=="quick_fib")
-        return quick_fib;
-    return nullptr;
+mod_func func_tbl[]={
+    {"fib",fib},
+    {"quick_fib",quick_fib},
+    {nullptr, nullptr},
+};
+
+extern "C" mod_func* get(){
+    return func_tbl;
 }
\ No newline at end of file
diff --git a/module/keyboard.cpp b/module/keyboard.cpp
index 280a743..9f95dba 100644
--- a/module/keyboard.cpp
+++ b/module/keyboard.cpp
@@ -83,13 +83,13 @@ var nas_noblock(var* args,usize size,gc* ngc){
     return nil;
 }
 
-extern "C" mod get(const char* n){
-    string name=n;
-    if(name=="nas_getch")
-        return nas_getch;
-    else if(name=="nas_kbhit")
-        return nas_kbhit;
-    else if(name=="nas_noblock")
-        return nas_noblock;
-    return nullptr;
+mod_func func_tbl[]={
+    {"nas_getch",nas_getch},
+    {"nas_kbhit",nas_kbhit},
+    {"nas_noblock",nas_noblock},
+    {nullptr,nullptr}
+};
+
+extern "C" mod_func* get(){
+    return func_tbl;
 }
\ No newline at end of file
diff --git a/module/libfib.nas b/module/libfib.nas
index 064bcf4..b852ec0 100644
--- a/module/libfib.nas
+++ b/module/libfib.nas
@@ -1,7 +1,7 @@
 var libfib=func(){
     var dl=dylib.dlopen("libfib."~(os.platform()=="windows"?"dll":"so"));
-    var fib=dylib.dlsym(dl,"fib");
-    var qfib=dylib.dlsym(dl,"quick_fib");
+    var fib=dl.fib;
+    var qfib=dl.quick_fib;
     var call=dylib.limitcall(1);
     return {
         fib: func(x){return call(fib,x)},
diff --git a/module/libkey.nas b/module/libkey.nas
index f08073e..9079108 100644
--- a/module/libkey.nas
+++ b/module/libkey.nas
@@ -1,8 +1,8 @@
 var libkey=func(){
     var lib=dylib.dlopen("libkey"~(os.platform()=="windows"?".dll":".so"));
-    var kb=dylib.dlsym(lib,"nas_kbhit");
-    var gt=dylib.dlsym(lib,"nas_getch");
-    var nb=dylib.dlsym(lib,"nas_noblock");
+    var kb=lib.nas_kbhit;
+    var gt=lib.nas_getch;
+    var nb=lib.nas_noblock;
     var call=dylib.limitcall(0);
     return {
         kbhit:func(){return call(kb);},
diff --git a/module/libmat.nas b/module/libmat.nas
index e557551..64a1cbd 100644
--- a/module/libmat.nas
+++ b/module/libmat.nas
@@ -1,31 +1,31 @@
 var libmat=func(){
     var dl=dylib.dlopen("libmat."~(os.platform()=="windows"?"dll":"so"));
-    var vec2=dylib.dlsym(dl,"nas_vec2");
-    var vec3=dylib.dlsym(dl,"nas_vec3");
+    var vec2=dl.nas_vec2;
+    var vec3=dl.nas_vec3;
     var (vec2add,vec2sub,vec2mul,vec2div,vec2neg,vec2norm,vec2len,vec2dot)=(
-        dylib.dlsym(dl,"nas_vec2_add"),
-        dylib.dlsym(dl,"nas_vec2_sub"),
-        dylib.dlsym(dl,"nas_vec2_mult"),
-        dylib.dlsym(dl,"nas_vec2_div"),
-        dylib.dlsym(dl,"nas_vec2_neg"),
-        dylib.dlsym(dl,"nas_vec2_norm"),
-        dylib.dlsym(dl,"nas_vec2_len"),
-        dylib.dlsym(dl,"nas_vec2_dot")
+        dl.nas_vec2_add,
+        dl.nas_vec2_sub,
+        dl.nas_vec2_mult,
+        dl.nas_vec2_div,
+        dl.nas_vec2_neg,
+        dl.nas_vec2_norm,
+        dl.nas_vec2_len,
+        dl.nas_vec2_dot
     );
     var (vec3add,vec3sub,vec3mul,vec3div,vec3neg,vec3norm,vec3len,vec3dot)=(
-        dylib.dlsym(dl,"nas_vec3_add"),
-        dylib.dlsym(dl,"nas_vec3_sub"),
-        dylib.dlsym(dl,"nas_vec3_mult"),
-        dylib.dlsym(dl,"nas_vec3_div"),
-        dylib.dlsym(dl,"nas_vec3_neg"),
-        dylib.dlsym(dl,"nas_vec3_norm"),
-        dylib.dlsym(dl,"nas_vec3_len"),
-        dylib.dlsym(dl,"nas_vec3_dot")
+        dl.nas_vec3_add,
+        dl.nas_vec3_sub,
+        dl.nas_vec3_mult,
+        dl.nas_vec3_div,
+        dl.nas_vec3_neg,
+        dl.nas_vec3_norm,
+        dl.nas_vec3_len,
+        dl.nas_vec3_dot
     );
     var (rotate_x,rotate_y,rotate_z)=(
-        dylib.dlsym(dl,"nas_rotate_x"),
-        dylib.dlsym(dl,"nas_rotate_y"),
-        dylib.dlsym(dl,"nas_rotate_z")
+        dl.nas_rotate_x,
+        dl.nas_rotate_y,
+        dl.nas_rotate_z
     );
     var (invoke_i,invoke_ii,invoke_iii)=(
         dylib.limitcall(1),
diff --git a/module/libsock.nas b/module/libsock.nas
index 2c9d28e..cafa7bb 100644
--- a/module/libsock.nas
+++ b/module/libsock.nas
@@ -1,18 +1,18 @@
 var socket=func(){
     var lib=dylib.dlopen("libnasock"~(os.platform()=="windows"?".dll":".so"));
     
-    var sock=dylib.dlsym(lib,"nas_socket");
-    var closesocket=dylib.dlsym(lib,"nas_closesocket");
-    var shutdown=dylib.dlsym(lib,"nas_shutdown");
-    var bind=dylib.dlsym(lib,"nas_bind");
-    var listen=dylib.dlsym(lib,"nas_listen");
-    var connect=dylib.dlsym(lib,"nas_connect");
-    var accept=dylib.dlsym(lib,"nas_accept");
-    var send=dylib.dlsym(lib,"nas_send");
-    var sendto=dylib.dlsym(lib,"nas_sendto");
-    var recv=dylib.dlsym(lib,"nas_recv");
-    var recvfrom=dylib.dlsym(lib,"nas_recvfrom");
-    var errno=dylib.dlsym(lib,"nas_errno");
+    var sock=lib.nas_socket;
+    var closesocket=lib.nas_closesocket;
+    var shutdown=lib.nas_shutdown;
+    var bind=lib.nas_bind;
+    var listen=lib.nas_listen;
+    var connect=lib.nas_connect;
+    var accept=lib.nas_accept;
+    var send=lib.nas_send;
+    var sendto=lib.nas_sendto;
+    var recv=lib.nas_recv;
+    var recvfrom=lib.nas_recvfrom;
+    var errno=lib.nas_errno;
 
     var (invoke,invoke_i,invoke_ii,invoke_iii,invoke_iiii,invoke_iiiii)=(
         dylib.limitcall(0),
diff --git a/module/matrix.cpp b/module/matrix.cpp
index e3511ec..a0bcdc1 100644
--- a/module/matrix.cpp
+++ b/module/matrix.cpp
@@ -266,49 +266,31 @@ var nas_vec3_dot(var* args,usize size,gc* ngc){
     return {vm_num,v0[0].num()*v1[0].num()+v0[1].num()*v1[1].num()+v0[2].num()*v1[2].num()};
 }
 
-extern "C" mod get(const char* n){
-    string name=n;
-    if(name=="nas_vec2")
-        return nas_vec2;
-    else if(name=="nas_vec2_add")
-        return nas_vec2_add;
-    else if(name=="nas_vec2_sub")
-        return nas_vec2_sub;
-    else if(name=="nas_vec2_mult")
-        return nas_vec2_mult;
-    else if(name=="nas_vec2_div")
-        return nas_vec2_div;
-    else if(name=="nas_vec2_neg")
-        return nas_vec2_neg;
-    else if(name=="nas_vec2_norm")
-        return nas_vec2_norm;
-    else if(name=="nas_vec2_len")
-        return nas_vec2_len;
-    else if(name=="nas_vec2_dot")
-        return nas_vec2_dot;
-    else if(name=="nas_vec3")
-        return nas_vec3;
-    else if(name=="nas_vec3_add")
-        return nas_vec3_add;
-    else if(name=="nas_vec3_sub")
-        return nas_vec3_sub;
-    else if(name=="nas_vec3_mult")
-        return nas_vec3_mult;
-    else if(name=="nas_vec3_div")
-        return nas_vec3_div;
-    else if(name=="nas_vec3_neg")
-        return nas_vec3_neg;
-    else if(name=="nas_vec3_norm")
-        return nas_vec3_norm;
-    else if(name=="nas_vec3_len")
-        return nas_vec3_len;
-    else if(name=="nas_rotate_x")
-        return nas_rotate_x;
-    else if(name=="nas_rotate_y")
-        return nas_rotate_y;
-    else if(name=="nas_rotate_z")
-        return nas_rotate_z;
-    else if(name=="nas_vec3_dot")
-        return nas_vec3_dot;
-    return nullptr;
+mod_func func_tbl[]={
+    {"nas_vec2",nas_vec2},
+    {"nas_vec2_add",nas_vec2_add},
+    {"nas_vec2_sub",nas_vec2_sub},
+    {"nas_vec2_mult",nas_vec2_mult},
+    {"nas_vec2_div",nas_vec2_div},
+    {"nas_vec2_neg",nas_vec2_neg},
+    {"nas_vec2_norm",nas_vec2_norm},
+    {"nas_vec2_len",nas_vec2_len},
+    {"nas_vec2_dot",nas_vec2_dot},
+    {"nas_vec3",nas_vec3},
+    {"nas_vec3_add",nas_vec3_add},
+    {"nas_vec3_sub",nas_vec3_sub},
+    {"nas_vec3_mult",nas_vec3_mult},
+    {"nas_vec3_div",nas_vec3_div},
+    {"nas_vec3_neg",nas_vec3_neg},
+    {"nas_vec3_norm",nas_vec3_norm},
+    {"nas_vec3_len",nas_vec3_len},
+    {"nas_rotate_x",nas_rotate_x},
+    {"nas_rotate_y",nas_rotate_y},
+    {"nas_rotate_z",nas_rotate_z},
+    {"nas_vec3_dot",nas_vec3_dot},
+    {nullptr,nullptr}
+};
+
+extern "C" mod_func* get(){
+    return func_tbl;
 }
\ No newline at end of file
diff --git a/module/nasocket.cpp b/module/nasocket.cpp
index 5c4a408..82bbc7a 100644
--- a/module/nasocket.cpp
+++ b/module/nasocket.cpp
@@ -187,31 +187,22 @@ var nas_errno(var* args,usize size,gc* ngc){
     return ngc->newstr(strerror(errno));
 }
 
-extern "C" mod get(const char* n){
-    string name=n;
-    if(name=="nas_socket")
-        return nas_socket;
-    else if(name=="nas_closesocket")
-        return nas_closesocket;
-    else if(name=="nas_shutdown")
-        return nas_shutdown;
-    else if(name=="nas_bind")
-        return nas_bind;
-    else if(name=="nas_listen")
-        return nas_listen;
-    else if(name=="nas_connect")
-        return nas_connect;
-    else if(name=="nas_accept")
-        return nas_accept;
-    else if(name=="nas_send")
-        return nas_send;
-    else if(name=="nas_sendto")
-        return nas_sendto;
-    else if(name=="nas_recv")
-        return nas_recv;
-    else if(name=="nas_recvfrom")
-        return nas_recvfrom;
-    else if(name=="nas_errno")
-        return nas_errno;
-    return nullptr;
+mod_func func_tbl[]={
+    {"nas_socket",nas_socket},
+    {"nas_closesocket",nas_closesocket},
+    {"nas_shutdown",nas_shutdown},
+    {"nas_bind",nas_bind},
+    {"nas_listen",nas_listen},
+    {"nas_connect",nas_connect},
+    {"nas_accept",nas_accept},
+    {"nas_send",nas_send},
+    {"nas_sendto",nas_sendto},
+    {"nas_recv",nas_recv},
+    {"nas_recvfrom",nas_recvfrom},
+    {"nas_errno",nas_errno},
+    {nullptr,nullptr}
+};
+
+extern "C" mod_func* get(){
+    return func_tbl;
 }
\ No newline at end of file
diff --git a/nasal_builtin.h b/nasal_builtin.h
index 9c7aa48..e97f533 100644
--- a/nasal_builtin.h
+++ b/nasal_builtin.h
@@ -930,33 +930,30 @@ var builtin_dlopen(var* local,gc& ngc)
 #endif
     if(!ptr)
         return nas_err("dlopen","cannot open dynamic lib <"+dlname.str()+">");
-    var ret=ngc.alloc(vm_obj);
-    ret.obj().set(nas_obj::dylib,ptr);
-    return ret;
-}
+    var ret=ngc.temp=ngc.alloc(vm_hash);
+    var lib=ngc.alloc(vm_obj);
+    lib.obj().set(nas_obj::dylib,ptr);
+    ret.hash().elems["lib"]=lib;
 
-var builtin_dlsym(var* local,gc& ngc)
-{
-    var lib=local[1];
-    var sym=local[2];
-    if(!lib.objchk(nas_obj::dylib))
-        return nas_err("dlsym","\"lib\" is not a valid dynamic lib");
-    if(sym.type!=vm_str)
-        return nas_err("dlsym","\"sym\" must be string");
-    // "get" function
 #ifdef _WIN32
     void* func=(void*)GetProcAddress((HMODULE)lib.obj().ptr,"get");
 #else
     void* func=dlsym(lib.obj().ptr,"get");
 #endif
     if(!func)
-        return nas_err("dlsym","cannot find get function");
+        return nas_err("dlopen","cannot find <get> function");
     // get function pointer by name
-    void* ptr=(void*)((getptr)func)(sym.str().c_str());
-    if(!ptr)
-        return nas_err("dlsym","cannot find function <"+sym.str()+">");
-    var ret=ngc.alloc(vm_obj);
-    ret.obj().set(nas_obj::faddr,ptr);
+    mod_func* tbl=(mod_func*)((getptr)func)();
+    if(!tbl)
+        return nas_err("dlopen","failed to get module functions");
+    for(u32 i=0;tbl[i].name;++i){
+        void* p=(void*)tbl[i].fd;
+        var tmp=ngc.alloc(vm_obj);
+        tmp.obj().set(nas_obj::faddr,p);
+        ret.hash().elems[tbl[i].name]=tmp;
+    }
+
+    ngc.temp=nil;
     return ret;
 }
 
@@ -1295,7 +1292,6 @@ struct
     {"__getcwd",  builtin_getcwd  },
     {"__getenv",  builtin_getenv  },
     {"__dlopen",  builtin_dlopen  },
-    {"__dlsym",   builtin_dlsym   },
     {"__dlclose", builtin_dlclose },
     {"__dlcallv", builtin_dlcallv },
     {"__dlcall",  builtin_dlcall  },
diff --git a/nasal_gc.h b/nasal_gc.h
index d127f64..671fc2d 100644
--- a/nasal_gc.h
+++ b/nasal_gc.h
@@ -778,4 +778,8 @@ var nas_err(const string& err_f,const string& info)
 }
 
 typedef var (*mod)(var*,usize,gc*); // module function type
-typedef mod (*getptr)(const char*); // module function "get" type
+typedef struct {
+    const char* name;
+    mod fd;
+} mod_func; // module function stores in tables with this type, end with {nullptr,nullptr}
+typedef mod_func* (*getptr)(); // module function "get" type
diff --git a/stl/lib.nas b/stl/lib.nas
index 295d964..f91941b 100644
--- a/stl/lib.nas
+++ b/stl/lib.nas
@@ -428,7 +428,7 @@ var unix={
 # dylib is the core hashmap for developers to load their own library.
 # for safe using dynamic library, you could use 'module' in stl/module.nas
 var dylib={
-    # open dynamic lib.
+    # open dynamic lib. return a hash including dl pointer and function pointers
     dlopen:  func(libname){
         # find dynamic lib from local dir first
         libname=(os.platform()=="windows"?".\\":"./")~libname;
@@ -448,8 +448,6 @@ var dylib={
         }
         return __dlopen(libname);
     },
-    # load symbol from an open dynamic lib.
-    dlsym:   func(lib,sym){return __dlsym; },
     # close dynamic lib, this operation will make all the symbols loaded from it invalid.
     dlclose: func(lib){return __dlclose;   },
     # call the loaded symbol, with infinite parameters:
diff --git a/test/module_test.nas b/test/module_test.nas
index aee3b81..7b84f4d 100644
--- a/test/module_test.nas
+++ b/test/module_test.nas
@@ -5,8 +5,8 @@ var libfib=func(){
         open:func(){
             if(dd==nil){
                 dd=dylib.dlopen("libfib."~(os.platform()=="windows"?"dll":"so"));
-                fib=dylib.dlsym(dd,"fib");
-                qfib=dylib.dlsym(dd,"quick_fib");
+                fib=dd.fib;
+                qfib=dd.quick_fib;
             }else{
                 println("[info  ] already loaded.");
             }
@@ -16,7 +16,7 @@ var libfib=func(){
                 println("[error ] already closed.");
                 return;
             }
-            dylib.dlclose(dd);
+            dylib.dlclose(dd.lib);
             (dd,fib,qfib)=(nil,nil,nil);
         },
         fib:func(x){
@@ -51,7 +51,7 @@ libfib.close();
 
 var speed_test=func(){
     var d=dylib.dlopen("libfib."~(os.platform()=="windows"?"dll":"so"));
-    var fd=dylib.dlsym(d,"quick_fib");
+    var fd=d.quick_fib;
     var vec_call=dylib.dlcall;
     var invoke=dylib.limitcall(1);