src/script/lua_api/l_base.cpp


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/*
Minetest
Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#include "lua_api/l_base.h"
#include "lua_api/l_internal.h"
#include "cpp_api/s_base.h"
#include "content/mods.h"
#include "profiler.h"
#include "server.h"
#include <algorithm>
#include <cmath>

ScriptApiBase *ModApiBase::getScriptApiBase(lua_State *L)
{
	// Get server from registry
	lua_rawgeti(L, LUA_REGISTRYINDEX, CUSTOM_RIDX_SCRIPTAPI);
	ScriptApiBase *sapi_ptr;
#if INDIRECT_SCRIPTAPI_RIDX
	sapi_ptr = (ScriptApiBase*) *(void**)(lua_touserdata(L, -1));
#else
	sapi_ptr = (ScriptApiBase*) lua_touserdata(L, -1);
#endif
	lua_pop(L, 1);
	return sapi_ptr;
}

Server *ModApiBase::getServer(lua_State *L)
{
	return getScriptApiBase(L)->getServer();
}

ServerInventoryManager *ModApiBase::getServerInventoryMgr(lua_State *L)
{
	return getScriptApiBase(L)->getServer()->getInventoryMgr();
}

#ifndef SERVER
Client *ModApiBase::getClient(lua_State *L)
{
	return getScriptApiBase(L)->getClient();
}
#endif

IGameDef *ModApiBase::getGameDef(lua_State *L)
{
	return getScriptApiBase(L)->getGameDef();
}

Environment *ModApiBase::getEnv(lua_State *L)
{
	return getScriptApiBase(L)->getEnv();
}

#ifndef SERVER
GUIEngine *ModApiBase::getGuiEngine(lua_State *L)
{
	return getScriptApiBase(L)->getGuiEngine();
}
#endif

std::string ModApiBase::getCurrentModPath(lua_State *L)
{
	lua_rawgeti(L, LUA_REGISTRYINDEX, CUSTOM_RIDX_CURRENT_MOD_NAME);
	std::string current_mod_name = readParam<std::string>(L, -1, "");
	if (current_mod_name.empty())
		return ".";

	const ModSpec *mod = getServer(L)->getModSpec(current_mod_name);
	if (!mod)
		return ".";

	return mod->path;
}


bool ModApiBase::registerFunction(lua_State *L, const char *name,
		lua_CFunction func, int top)
{
	// TODO: Check presence first!

	lua_pushcfunction(L, func);
	lua_setfield(L, top, name);

	return true;
}

int ModApiBase::l_deprecated_function(lua_State *L, const char *good, const char *bad, lua_CFunction func)
{
	thread_local std::vector<u64> deprecated_logged;

	DeprecatedHandlingMode dep_mode = get_deprecated_handling_mode();
	if (dep_mode == DeprecatedHandlingMode::Ignore)
		return func(L);

	u64 start_time = porting::getTimeUs();
	lua_Debug ar;

	// Get caller name with line and script backtrace
	FATAL_ERROR_IF(!lua_getstack(L, 1, &ar), "lua_getstack() failed");
	FATAL_ERROR_IF(!lua_getinfo(L, "Sl", &ar), "lua_getinfo() failed");

	// Get backtrace and hash it to reduce the warning flood
	std::string backtrace = ar.short_src;
	backtrace.append(":").append(std::to_string(ar.currentline));
	u64 hash = murmur_hash_64_ua(backtrace.data(), backtrace.length(), 0xBADBABE);

	if (std::find(deprecated_logged.begin(), deprecated_logged.end(), hash)
			== deprecated_logged.end()) {

		deprecated_logged.emplace_back(hash);
		warningstream << "Call to deprecated function '"  << bad << "', please use '"
			<< good << "' at " << backtrace << std::endl;

		if (dep_mode == DeprecatedHandlingMode::Error)
			script_error(L, LUA_ERRRUN, NULL, NULL);
	}

	u64 end_time = porting::getTimeUs();
	g_profiler->avg("l_deprecated_function", end_time - start_time);

	return func(L);
}
/*
** $Id: lvm.c,v 2.63.1.5 2011/08/17 20:43:11 roberto Exp $
** Lua virtual machine
** See Copyright Notice in lua.h
*/


#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define lvm_c
#define LUA_CORE

#include "lua.h"

#include "ldebug.h"
#include "ldo.h"
#include "lfunc.h"
#include "lgc.h"
#include "lobject.h"
#include "lopcodes.h"
#include "lstate.h"
#include "lstring.h"
#include "ltable.h"
#include "ltm.h"
#include "lvm.h"


/* limit for table tag-method chains (to avoid loops) */
#define MAXTAGLOOP	100


const TValue *luaV_tonumber (const TValue *obj, TValue *n) {
  lua_Number num;
  if (ttisnumber(obj)) return obj;
  if (ttisstring(obj) && luaO_str2d(svalue(obj), &num)) {
    setnvalue(n, num);
    return n;
  }
  else
    return NULL;
}


int luaV_tostring (lua_State *L, StkId obj) {
  if (!ttisnumber(obj))
    return 0;
  else {
    char s[LUAI_MAXNUMBER2STR];
    lua_Number n = nvalue(obj);
    lua_number2str(s, n);
    setsvalue2s(L, obj, luaS_new(L, s));
    return 1;
  }
}


static void traceexec (lua_State *L, const Instruction *pc) {
  lu_byte mask = L->hookmask;
  const Instruction *oldpc = L->savedpc;
  L->savedpc = pc;
  if ((mask & LUA_MASKCOUNT) && L->hookcount == 0) {
    resethookcount(L);
    luaD_callhook(L, LUA_HOOKCOUNT, -1);
  }
  if (mask & LUA_MASKLINE) {
    Proto *p = ci_func(L->ci)->l.p;
    int npc = pcRel(pc, p);
    int newline = getline(p, npc);
    /* call linehook when enter a new function, when jump back (loop),
       or when enter a new line */
    if (npc == 0 || pc <= oldpc || newline != getline(p, pcRel(oldpc, p)))
      luaD_callhook(L, LUA_HOOKLINE, newline);
  }
}


static void callTMres (lua_State *L, StkId res, const TValue *f,
                        const TValue *p1, const TValue *p2) {
  ptrdiff_t result = savestack(L, res);
  setobj2s(L, L->top, f);  /* push function */
  setobj2s(L, L->top+1, p1);  /* 1st argument */
  setobj2s(L, L->top+2, p2);  /* 2nd argument */
  luaD_checkstack(L, 3);
  L->top += 3;
  luaD_call(L, L->top - 3, 1);
  res = restorestack(L, result);
  L->top--;
  setobjs2s(L, res, L->top);
}


static void callTM (lua_State *L, const TValue *f, const TValue *p1,
                    const TValue *p2, const TValue *p3) {
  setobj2s(L, L->top, f);  /* push function */
  setobj2s(L, L->top+1, p1);  /* 1st argument */
  setobj2s(L, L->top+2, p2);  /* 2nd argument */
  setobj2s(L, L->top+3, p3);  /* 3th argument */
  luaD_checkstack(L, 4);
  L->top += 4;
  luaD_call(L, L->top - 4, 0);
}


void luaV_gettable (lua_State *L, const TValue *t, TValue *key, StkId val) {
  int loop;
  for (loop = 0; loop < MAXTAGLOOP; loop++) {
    const TValue *tm;
    if (ttistable(t)) {  /* `t' is a table? */
      Table *h = hvalue(t);
      const TValue *res = luaH_get(h, key); /* do a primitive get */
      if (!ttisnil(res) ||  /* result is no nil? */
          (tm = fasttm(L, h->metatable, TM_INDEX)) == NULL) { /* or no TM? */
        setobj2s(L, val, res);
        return;
      }
      /* else will try the tag method */
    }
    else if (ttisnil(tm = luaT_gettmbyobj(L, t, TM_INDEX)))
      luaG_typeerror(L, t, "index");
    if (ttisfunction(tm)) {
      callTMres(L, val, tm, t, key);
      return;
    }
    t = tm;  /* else repeat with `tm' */ 
  }
  luaG_runerror(L, "loop in gettable");
}


void luaV_settable (lua_State *L, const TValue *t, TValue *key, StkId val) {
  int loop;
  TValue temp;
  for (loop = 0; loop < MAXTAGLOOP; loop++) {
    const TValue *tm;
    if (ttistable(t)) {  /* `t' is a table? */
      Table *h = hvalue(t);
      TValue *oldval = luaH_set(L, h, key); /* do a primitive set */
      if (!ttisnil(oldval) ||  /* result is no nil? */
          (tm = fasttm(L, h->metatable, TM_NEWINDEX)) == NULL) { /* or no TM? */
        setobj2t(L, oldval, val);
        h->flags = 0;
        luaC_barriert(L, h, val);
        return;
      }
      /* else will try the tag method */
    }
    else if (ttisnil(tm = luaT_gettmbyobj(L, t, TM_NEWINDEX)))
      luaG_typeerror(L, t, "index");
    if (ttisfunction(tm)) {
      callTM(L, tm, t, key, val);
      return;
    }
    /* else repeat with `tm' */
    setobj(L, &temp, tm);  /* avoid pointing inside table (may rehash) */
    t = &temp;
  }
  luaG_runerror(L, "loop in settable");
}


static int call_binTM (lua_State *L, const TValue *p1, const TValue *p2,
                       StkId res, TMS event) {
  const TValue *tm = luaT_gettmbyobj(L, p1, event);  /* try first operand */
  if (ttisnil(tm))
    tm = luaT_gettmbyobj(L, p2, event);  /* try second operand */
  if (ttisnil(tm)) return 0;
  callTMres(L, res, tm, p1, p2);
  return 1;
}


static const TValue *get_compTM (lua_State *L, Table *mt1, Table *mt2,
                                  TMS event) {
  const TValue *tm1 = fasttm(L, mt1, event);
  const TValue *tm2;
  if (tm1 == NULL) return NULL;  /* no metamethod */
  if (mt1 == mt2) return tm1;  /* same metatables => same metamethods */
  tm2 = fasttm(L, mt2, event);
  if (tm2 == NULL) return NULL;  /* no metamethod */
  if (luaO_rawequalObj(tm1, tm2))  /* same metamethods? */
    return tm1;
  return NULL;
}


static int call_orderTM (lua_State *L, const TValue *p1, const TValue *p2,
                         TMS event) {
  const TValue *tm1 = luaT_gettmbyobj(L, p1, event);
  const TValue *tm2;
  if (ttisnil(tm1)) return -1;  /* no metamethod? */
  tm2 = luaT_gettmbyobj(L, p2, event);
  if (!luaO_rawequalObj(tm1, tm2))  /* different metamethods? */
    return -1;
  callTMres(L, L->top, tm1, p1, p2);
  return !l_isfalse(L->top);
}


static int l_strcmp (const TString *ls, const TString *rs) {
  const char *l = getstr(ls);
  size_t ll = ls->tsv.len;
  const char *r = getstr(rs);
  size_t lr = rs->tsv.len;
  for (;;) {
    int temp = strcoll(l, r);
    if (temp != 0) return temp;
    else {  /* strings are equal up to a `\0' */
      size_t len = strlen(l);  /* index of first `\0' in both strings */
      if (len == lr)  /* r is finished? */
        return (len == ll) ? 0 : 1;
      else if (len == ll)  /* l is finished? */
        return -1;  /* l is smaller than r (because r is not finished) */
      /* both strings longer than `len'; go on comparing (after the `\0') */
      len++;
      l += len; ll -= len; r += len; lr -= len;
    }
  }
}


int luaV_lessthan (lua_State *L, const TValue *l, const TValue *r) {
  int res;
  if (ttype(l) != ttype(r))
    return luaG_ordererror(L, l, r);
  else if (ttisnumber(l))
    return luai_numlt(nvalue(l), nvalue(r));
  else if (ttisstring(l))
    return l_strcmp(rawtsvalue(l), rawtsvalue(r)) < 0;
  else if ((res = call_orderTM(L, l, r, TM_LT)) != -1)
    return res;
  return luaG_ordererror(L, l, r);
}


static int lessequal (lua_State *L, const TValue *l, const TValue *r) {
  int res;
  if (ttype(l) != ttype(r))
    return luaG_ordererror(L, l, r);
  else if (ttisnumber(l))
    return luai_numle(nvalue(l), nvalue(r));
  else if (ttisstring(l))
    return l_strcmp(rawtsvalue(l), rawtsvalue(r)) <= 0;
  else if ((res = call_orderTM(L, l, r, TM_LE)) != -1)  /* first try `le' */
    return res;
  else if ((res = call_orderTM(L, r, l, TM_LT)) != -1)  /* else try `lt' */
    return !res;
  return luaG_ordererror(L, l, r);
}


int luaV_equalval (lua_State *L, const TValue *t1, const TValue *t2) {
  const TValue *tm;
  lua_assert(ttype(t1) == ttype(t2));
  switch (ttype(t1)) {
    case LUA_TNIL: return 1;
    case LUA_TNUMBER: return luai_numeq(nvalue(t1), nvalue(t2));
    case LUA_TBOOLEAN: return bvalue(t1) == bvalue(t2);  /* true must be 1 !! */
    case LUA_TLIGHTUSERDATA: return pvalue(t1) == pvalue(t2);
    case LUA_TUSERDATA: {
      if (uvalue(t1) == uvalue(t2)) return 1;
      tm = get_compTM(L, uvalue(t1)->metatable, uvalue(t2)->metatable,
                         TM_EQ);
      break;  /* will try TM */
    }
    case LUA_TTABLE: {
      if (hvalue(t1) == hvalue(t2)) return 1;
      tm = get_compTM(L, hvalue(t1)->metatable, hvalue(t2)->metatable, TM_EQ);
      break;  /* will try TM */
    }
    default: return gcvalue(t1) == gcvalue(t2);
  }
  if (tm == NULL) return 0;  /* no TM? */
  callTMres(L, L->top, tm, t1, t2);  /* call TM */
  return !l_isfalse(L->top);
}


void luaV_concat (lua_State *L, int total, int last) {
  do {
    StkId top = L->base + last + 1;
    int n = 2;  /* number of elements handled in this pass (at least 2) */
    if (!(ttisstring(top-2) || ttisnumber(top-2)) || !tostring(L, top-1)) {
      if (!call_binTM(L, top-2, top-1, top-2, TM_CONCAT))
        luaG_concaterror(L, top-2, top-1);
    } else if (tsvalue(top-1)->len == 0)  /* second op is empty? */
      (void)tostring(L, top - 2);  /* result is first op (as string) */
    else {
      /* at least two string values; get as many as possible */
      size_t tl = tsvalue(top-1)->len;
      char *buffer;
      int i;
      /* collect total length */
      for (n = 1; n < total && tostring(L, top-n-1); n++) {
        size_t l = tsvalue(top-n-1)->len;