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/*jshint esversion: 6 */
"use strict";
const assert = require('assert');
const defs = require('./defs.js');
const lobject = require('./lobject.js');
const ldo = require('./ldo.js');
const lapi = require('./lapi.js');
const ltable = require('./ltable.js');
const lfunc = require('./lfunc.js');
const ltm = require('./ltm.js');
const CT = defs.constant_types;
const TS = defs.thread_status;
const LUA_NUMTAGS = CT.LUA_NUMTAGS;
const EXTRA_STACK = 5;
const BASIC_STACK_SIZE = 2 * defs.LUA_MINSTACK;
class CallInfo {
constructor() {
this.func = null;
this.funcOff = NaN;
this.top = NaN;
this.previous = null;
this.next = null;
/* only for Lua functions */
this.l_base = NaN; /* base for this function */
this.l_code = null; /* reference to this.func.p.code */
this.l_savedpc = NaN; /* offset into l_code */
/* only for JS functions */
this.c_k = null; /* continuation in case of yields */
this.c_old_errfunc = null;
this.c_ctx = null; /* context info. in case of yields */
this.nresults = NaN;
this.callstatus = NaN;
}
}
class lua_State {
constructor(g) {
this.id = g.id_counter++;
this.base_ci = new CallInfo(); /* CallInfo for first level (C calling Lua) */
this.top = NaN; /* first free slot in the stack */
this.stack_last = NaN; /* last free slot in the stack */
this.oldpc = NaN; /* last pc traced */
/* preinit_thread */
this.l_G = g;
this.stack = null;
this.ci = null;
this.errorJmp = null;
this.nCcalls = 0;
this.hook = null;
this.hookmask = 0;
this.basehookcount = 0;
this.allowhook = 1;
this.hookcount = this.basehookcount;
this.openupval = null;
this.nny = 1;
this.status = TS.LUA_OK;
this.errfunc = 0;
}
}
class global_State {
constructor() {
this.id_counter = 0; /* used to give objects unique ids */
this.mainthread = null;
this.l_registry = new lobject.TValue(CT.LUA_TNIL, null);
this.panic = null;
this.atnativeerror = null;
this.version = null;
this.tmname = new Array(ltm.TMS.TM_N);
this.mt = new Array(LUA_NUMTAGS);
}
}
const luaE_extendCI = function(L) {
let ci = new CallInfo();
L.ci.next = ci;
ci.previous = L.ci;
ci.next = null;
L.ci = ci;
return ci;
};
const luaE_freeCI = function(L) {
let ci = L.ci;
ci.next = null;
};
const stack_init = function(L1, L) {
L1.stack = new Array(BASIC_STACK_SIZE);
L1.top = 0;
L1.stack_last = BASIC_STACK_SIZE - EXTRA_STACK;
/* initialize first ci */
let ci = L1.base_ci;
ci.next = ci.previous = null;
ci.callstatus = 0;
ci.funcOff = L1.top;
ci.func = L1.stack[L1.top];
L1.stack[L1.top++] = new lobject.TValue(CT.LUA_TNIL, null);
ci.top = L1.top + defs.LUA_MINSTACK;
L1.ci = ci;
};
const freestack = function(L) {
L.ci = L.base_ci;
luaE_freeCI(L);
L.stack = null;
};
/*
** Create registry table and its predefined values
*/
const init_registry = function(L, g) {
let registry = ltable.luaH_new(L);
g.l_registry.sethvalue(registry);
ltable.luaH_setint(registry, defs.LUA_RIDX_MAINTHREAD, new lobject.TValue(CT.LUA_TTHREAD, L));
ltable.luaH_setint(registry, defs.LUA_RIDX_GLOBALS, new lobject.TValue(CT.LUA_TTABLE, ltable.luaH_new(L)));
};
/*
** open parts of the state that may cause memory-allocation errors.
** ('g->version' !== NULL flags that the state was completely build)
*/
const f_luaopen = function(L) {
let g = L.l_G;
stack_init(L, L);
init_registry(L, g);
ltm.luaT_init(L);
g.version = lapi.lua_version(null);
};
const lua_newthread = function(L) {
let g = L.l_G;
let L1 = new lua_State(g);
L.stack[L.top] = new lobject.TValue(CT.LUA_TTHREAD, L1);
L.top++;
assert(L.top <= L.ci.top, "stack overflow");
L1.hookmask = L.hookmask;
L1.basehookcount = L.basehookcount;
L1.hook = L.hook;
L1.hookcount = L1.basehookcount;
stack_init(L1, L);
return L1;
};
const luaE_freethread = function(L, L1) {
lfunc.luaF_close(L1, L1.stack);
freestack(L1);
};
const lua_newstate = function() {
let g = new global_State();
let L = new lua_State(g);
g.mainthread = L;
if (ldo.luaD_rawrunprotected(L, f_luaopen, null) !== TS.LUA_OK) {
L = null;
}
return L;
};
const close_state = function(L) {
lfunc.luaF_close(L, L.stack); /* close all upvalues for this thread */
freestack(L);
};
const lua_close = function(L) {
L = L.l_G.mainthread; /* only the main thread can be closed */
close_state(L);
};
module.exports.lua_State = lua_State;
module.exports.CallInfo = CallInfo;
module.exports.CIST_OAH = (1<<0); /* original value of 'allowhook' */
module.exports.CIST_LUA = (1<<1); /* call is running a Lua function */
module.exports.CIST_HOOKED = (1<<2); /* call is running a debug hook */
module.exports.CIST_FRESH = (1<<3); /* call is running on a fresh invocation of luaV_execute */
module.exports.CIST_YPCALL = (1<<4); /* call is a yieldable protected call */
module.exports.CIST_TAIL = (1<<5); /* call was tail called */
module.exports.CIST_HOOKYIELD = (1<<6); /* last hook called yielded */
module.exports.CIST_LEQ = (1<<7); /* using __lt for __le */
module.exports.CIST_FIN = (1<<8); /* call is running a finalizer */
module.exports.EXTRA_STACK = EXTRA_STACK;
module.exports.lua_close = lua_close;
module.exports.lua_newstate = lua_newstate;
module.exports.lua_newthread = lua_newthread;
module.exports.luaE_extendCI = luaE_extendCI;
module.exports.luaE_freeCI = luaE_freeCI;
module.exports.luaE_freethread = luaE_freethread;
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