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Luajit笔记(1)——Luajit简介

Posted by nanxiao on 七月 28, 2015 in Luajit笔记 |

Luajit(官方网站:http://luajit.org/)是针对Lua语言的一个JIT(Just-In-Time)的编译器,目前完全支持Lua5.1版本。

下载Luajit源代码后,编译安装很简单:

make
make install

生成一个可执行文件:luajit(其实是一个符号连接):

[root@Fedora lua_program]# ls -lt /usr/local/bin/luajit
lrwxrwxrwx. 1 root root 12 Jul 27 21:06 /usr/local/bin/luajit -> luajit-2.0.4

luajit可以用来运行Lua脚本和语句:

[root@Fedora lua_program]# luajit
LuaJIT 2.0.4 -- Copyright (C) 2005-2015 Mike Pall. http://luajit.org/
JIT: ON CMOV SSE2 SSE3 fold cse dce fwd dse narrow loop abc sink fuse
> print("Hello world\n")
Hello world

此外还会生成一些动态和静态链接库,供应用程序使用:

lrwxrwxrwx.  1 root root      22 Jul 27 21:06 libluajit-5.1.so -> libluajit-5.1.so.2.0.4
lrwxrwxrwx.  1 root root      22 Jul 27 21:06 libluajit-5.1.so.2 -> libluajit-5.1.so.2.0.4
-rwxr-xr-x.  1 root root  458144 Jul 27 21:06 libluajit-5.1.so.2.0.4
-rw-r--r--.  1 root root  790748 Jul 27 21:06 libluajit-5.1.a

以下面的C程序为例:

#include <stdio.h>
#include <string.h>
#include "luajit-2.0/lua.h"
#include "luajit-2.0/lualib.h"
#include "luajit-2.0/lauxlib.h"


int main (void) {
    char buff[256];
    int error;
    lua_State *L = lua_open();   /* opens Lua */
    luaL_openlibs(L);

    while (fgets(buff, sizeof(buff), stdin) != NULL) {
        error = luaL_loadbuffer(L, buff, strlen(buff), "line") ||
                lua_pcall(L, 0, 0, 0);
        if (error) {
          fprintf(stderr, "%s", lua_tostring(L, -1));
          lua_pop(L, 1);  /* pop error message from the stack */
        }
    }

    lua_close(L);
    return 0;
}

编译(链接Luajit库):

gcc -g -o a a.c -lluajit-5.1

运行:

[root@Fedora test]# ./a
print("hello")
hello

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