Refactor main_state handling

Don't allow to set hook if main_state is not available
Remove Lua 5.1 dirty hack

src/ffi/internals51.rs

@@ -1,120 +0,0 @@
-// The MIT License (MIT)
-//
-// Copyright (c) 2020 A. Orlenko
-//
-// Permission is hereby granted, free of charge, to any person obtaining a copy
-// of this software and associated documentation files (the "Software"), to deal
-// in the Software without restriction, including without limitation the rights
-// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-// copies of the Software, and to permit persons to whom the Software is
-// furnished to do so, subject to the following conditions:
-//
-// The above copyright notice and this permission notice shall be included in
-// all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-// THE SOFTWARE.
-
-use std::os::raw::*;
-
-use crate::ffi::{lua_Alloc, lua_CFunction, lua_Hook, lua_Number, lua_State};
-
-#[repr(C)]
-struct lua_StateExt {
-    next: *mut c_void,
-    tt: u8,
-    marked: u8,
-    status: u8,
-    top: *mut c_void,
-    base: *mut c_void,
-    l_G: *mut global_State,
-    ci: *mut c_void,
-    savedpc: *const c_void,
-    stack_last: *mut c_void,
-    stack: *mut c_void,
-    end_ci: *mut c_void,
-    base_ci: *mut c_void,
-    stacksize: c_int,
-    size_ci: c_int,
-    nCcalls: c_ushort,
-    baseCcalls: c_ushort,
-    hookmask: u8,
-    allowhook: u8,
-    basehookcount: c_int,
-    hookcount: c_int,
-    hook: Option<lua_Hook>,
-    l_gt: TValue,
-    env: TValue,
-    openupval: *mut c_void,
-    gclist: *mut c_void,
-    errorJmp: *mut c_void,
-    errfunc: isize,
-}
-
-#[repr(C)]
-#[derive(Clone, Copy)]
-struct TValue {
-    value: Value,
-    tt: c_int,
-}
-
-#[repr(C)]
-#[derive(Clone, Copy)]
-union Value {
-    gc: *mut c_void,
-    p: *mut c_void,
-    n: lua_Number,
-    b: c_int,
-}
-
-#[repr(C)]
-struct global_State {
-    strt: stringtable,
-    frealloc: Option<lua_Alloc>,
-    ud: *mut c_void,
-    currentwhite: u8,
-    gcstate: u8,
-    sweepstrgc: c_int,
-    rootgc: *mut c_void,
-    sweepgc: *mut c_void,
-    gray: *mut c_void,
-    grayagain: *mut c_void,
-    weak: *mut c_void,
-    tmudata: *mut c_void,
-    buff: Mbuffer,
-    GCthreshold: usize,
-    totalbytes: usize,
-    estimate: usize,
-    gcdept: usize,
-    gcpause: c_int,
-    gcstepmul: c_int,
-    panic: Option<lua_CFunction>,
-    l_registry: TValue,
-    mainthread: *mut lua_State,
-    // Other fields ommited
-}
-
-#[repr(C)]
-struct stringtable {
-    hash: *mut c_void,
-    nuse: c_uint,
-    size: c_int,
-}
-
-#[repr(C)]
-struct Mbuffer {
-    buffer: *mut c_char,
-    n: usize,
-    buffsize: usize,
-}
-
-pub unsafe fn lua_getmainstate(state: *mut lua_State) -> *mut lua_State {
-    let state = state as *mut lua_StateExt;
-    let global = (*state).l_G;
-    (*global).mainthread
-}

src/ffi/mod.rs

@@ -170,9 +170,6 @@ pub use self::lua::{lua_isyieldable, lua_version};
 #[cfg(any(feature = "lua54", feature = "lua53", feature = "lua52"))]
 pub use self::lua::{lua_callk, lua_pcallk, lua_upvalueid, lua_upvaluejoin, lua_yieldk};
 
-#[cfg(feature = "lua51")]
-pub use self::internals51::lua_getmainstate;
-
 // auxiliary library types
 pub use self::lauxlib::luaL_Reg;
 
@@ -287,9 +284,6 @@ mod glue {
 #[cfg(any(feature = "lua52", feature = "lua51", feature = "luajit"))]
 mod compat53;
 
-#[cfg(feature = "lua51")]
-mod internals51;
-
 mod lauxlib;
 mod lua;
 mod luaconf;