c++ - 一些 lua/c++ 代码中的 SIGSEGV 错误

Question

以下代码以 SIGSEGV 错误结尾：

extern "C" {
    #include "lua/lua.h"
    #include "lua/lualib.h"
    #include "lua/lauxlib.h"
}

int main( int argc, char *argv[] )
{
    lua_State *L;
    luaL_openlibs(L);
    lua_close(L);
    return 0;
}

Gdb 给了我以下信息：

(gdb) run
Starting program: d:\Dropbox\cpp\engine\bin\main.exe
[New Thread 7008.0x1df8]

Program received signal SIGSEGV, Segmentation fault.
0x6d781f30 in lua_pushcclosure () from d:\Dropbox\cpp\engine\bin\lua52.dll
(gdb) where
#0  0x6d781f30 in lua_pushcclosure () from d:\Dropbox\cpp\engine\bin\lua52.dll
#1  0x6d79329e in luaL_requiref () from d:\Dropbox\cpp\engine\bin\lua52.dll
#2  0x6d79bdee in luaL_openlibs () from d:\Dropbox\cpp\engine\bin\lua52.dll
#3  0x004013a6 in main (argc=1, argv=0x702fc8) at main.cpp:10
(gdb)

Answer 1

您必须在打开 lib ( ) 之前创建一个新的 lua 状态luaL_openlibs(L);，如下所示：

L = luaL_newstate();

您会遇到分段错误，因为您有一个未初始化的指针，取消引用它（这是 lib 所做的）是未定义的行为。