Re: LuaJIT embedding help

[Mike Pall <mikelu-0611@...>]

Hi,

jason bright wrote:
>    d- turn on the jit compiler with "require("jit.opt").start()"
> 
> Everything works until i try step d). Then I get no results or C callbacks
> out of Lua when i try to run any Lua functions. No Lua errors are generated
> on any of the steps. I've been over the steps on the install instructions
> several times and can't see anything i'm missing. Any pointers appreciated!

I tried your function in a minimal test program and it worked
just fine:

  int main(int argc, char **argv)
  {
    lua_State *L = lua_open();
    luaL_openlibs(L);
    InstallJITCode(L);
    if (luaL_dofile(L, "mytest.lua") != 0)
      fprintf(stderr, "%s\n", lua_tostring(L,-1));
    lua_close(L);
    return 0;
  }

mytest.lua:

  require("jit.opt").start()
  -- Load jit/dump.lua so we get to see whether abs() is inlined.
  require("jit.dump").start()
  local function testopt(x) return math.abs(x) end
  testopt(-1)

This should produce an assembler dump containing an "fabs"
instruction if the optimizer has been activated correctly.

Are you sure you've linked in the correct versions of opt.lua and
opt_inline.lua? Are you sure you don't get any error from Lua?
Maybe it's hidden inside some pcall()/lua_pcall(). Are you sure
you use luaL_openlibs() to load the base jit library? Have you
stripped anything from the standard Lua libraries?

Well, this is poking in the dark ... everything works fine here.

Bye,
     Mike