lua/lstate.c
author Ryan C. Gordon <icculus@icculus.org>
Thu, 09 Apr 2020 02:15:46 -0400
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otp: Some base32-decoding fixes to match what Google Authenticator expects.
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/*
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** $Id: lstate.c,v 2.99.1.2 2013/11/08 17:45:31 roberto Exp $
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** Global State
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** See Copyright Notice in lua.h
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*/
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#include <stddef.h>
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#include <string.h>
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#define lstate_c
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#define LUA_CORE
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#include "lua.h"
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#include "lapi.h"
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#include "ldebug.h"
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#include "ldo.h"
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#include "lfunc.h"
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#include "lgc.h"
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#include "llex.h"
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#include "lmem.h"
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#include "lstate.h"
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#include "lstring.h"
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#include "ltable.h"
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#include "ltm.h"
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#if !defined(LUAI_GCPAUSE)
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#define LUAI_GCPAUSE	200  /* 200% */
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#endif
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#if !defined(LUAI_GCMAJOR)
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#define LUAI_GCMAJOR	200  /* 200% */
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#endif
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#if !defined(LUAI_GCMUL)
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#define LUAI_GCMUL	200 /* GC runs 'twice the speed' of memory allocation */
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#endif
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#define MEMERRMSG	"not enough memory"
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/*
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** a macro to help the creation of a unique random seed when a state is
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** created; the seed is used to randomize hashes.
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*/
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#if !defined(luai_makeseed)
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#include <time.h>
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#define luai_makeseed()		cast(unsigned int, time(NULL))
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#endif
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/*
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** thread state + extra space
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*/
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typedef struct LX {
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#if defined(LUAI_EXTRASPACE)
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  char buff[LUAI_EXTRASPACE];
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#endif
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  lua_State l;
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} LX;
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/*
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** Main thread combines a thread state and the global state
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*/
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typedef struct LG {
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  LX l;
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  global_State g;
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} LG;
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#define fromstate(L)	(cast(LX *, cast(lu_byte *, (L)) - offsetof(LX, l)))
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/*
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** Compute an initial seed as random as possible. In ANSI, rely on
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** Address Space Layout Randomization (if present) to increase
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** randomness..
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*/
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#define addbuff(b,p,e) \
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  { size_t t = cast(size_t, e); \
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    memcpy(buff + p, &t, sizeof(t)); p += sizeof(t); }
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static unsigned int makeseed (lua_State *L) {
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  char buff[4 * sizeof(size_t)];
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  unsigned int h = luai_makeseed();
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  int p = 0;
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  addbuff(buff, p, L);  /* heap variable */
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  addbuff(buff, p, &h);  /* local variable */
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  addbuff(buff, p, luaO_nilobject);  /* global variable */
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  addbuff(buff, p, &lua_newstate);  /* public function */
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  lua_assert(p == sizeof(buff));
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  return luaS_hash(buff, p, h);
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}
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/*
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** set GCdebt to a new value keeping the value (totalbytes + GCdebt)
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** invariant
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*/
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void luaE_setdebt (global_State *g, l_mem debt) {
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  g->totalbytes -= (debt - g->GCdebt);
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  g->GCdebt = debt;
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}
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CallInfo *luaE_extendCI (lua_State *L) {
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  CallInfo *ci = luaM_new(L, CallInfo);
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  lua_assert(L->ci->next == NULL);
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  L->ci->next = ci;
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  ci->previous = L->ci;
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  ci->next = NULL;
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  return ci;
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}
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void luaE_freeCI (lua_State *L) {
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  CallInfo *ci = L->ci;
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  CallInfo *next = ci->next;
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  ci->next = NULL;
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  while ((ci = next) != NULL) {
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    next = ci->next;
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    luaM_free(L, ci);
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  }
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}
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static void stack_init (lua_State *L1, lua_State *L) {
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  int i; CallInfo *ci;
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  /* initialize stack array */
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  L1->stack = luaM_newvector(L, BASIC_STACK_SIZE, TValue);
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  L1->stacksize = BASIC_STACK_SIZE;
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  for (i = 0; i < BASIC_STACK_SIZE; i++)
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    setnilvalue(L1->stack + i);  /* erase new stack */
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  L1->top = L1->stack;
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  L1->stack_last = L1->stack + L1->stacksize - EXTRA_STACK;
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  /* initialize first ci */
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  ci = &L1->base_ci;
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  ci->next = ci->previous = NULL;
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  ci->callstatus = 0;
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  ci->func = L1->top;
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  setnilvalue(L1->top++);  /* 'function' entry for this 'ci' */
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  ci->top = L1->top + LUA_MINSTACK;
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  L1->ci = ci;
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}
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static void freestack (lua_State *L) {
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  if (L->stack == NULL)
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    return;  /* stack not completely built yet */
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  L->ci = &L->base_ci;  /* free the entire 'ci' list */
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  luaE_freeCI(L);
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  luaM_freearray(L, L->stack, L->stacksize);  /* free stack array */
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   159
}
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/*
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** Create registry table and its predefined values
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*/
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static void init_registry (lua_State *L, global_State *g) {
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   166
  TValue mt;
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  /* create registry */
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  Table *registry = luaH_new(L);
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   169
  sethvalue(L, &g->l_registry, registry);
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  luaH_resize(L, registry, LUA_RIDX_LAST, 0);
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  /* registry[LUA_RIDX_MAINTHREAD] = L */
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  setthvalue(L, &mt, L);
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   173
  luaH_setint(L, registry, LUA_RIDX_MAINTHREAD, &mt);
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   174
  /* registry[LUA_RIDX_GLOBALS] = table of globals */
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   175
  sethvalue(L, &mt, luaH_new(L));
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   176
  luaH_setint(L, registry, LUA_RIDX_GLOBALS, &mt);
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   177
}
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   178
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   180
/*
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** open parts of the state that may cause memory-allocation errors
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*/
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   183
static void f_luaopen (lua_State *L, void *ud) {
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   184
  global_State *g = G(L);
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   185
  UNUSED(ud);
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   186
  stack_init(L, L);  /* init stack */
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   187
  init_registry(L, g);
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   188
  luaS_resize(L, MINSTRTABSIZE);  /* initial size of string table */
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   189
  luaT_init(L);
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   190
  luaX_init(L);
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   191
  /* pre-create memory-error message */
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   192
  g->memerrmsg = luaS_newliteral(L, MEMERRMSG);
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   193
  luaS_fix(g->memerrmsg);  /* it should never be collected */
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   194
  g->gcrunning = 1;  /* allow gc */
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   195
  g->version = lua_version(NULL);
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   196
  luai_userstateopen(L);
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   197
}
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   198
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   199
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   200
/*
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   201
** preinitialize a state with consistent values without allocating
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   202
** any memory (to avoid errors)
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   203
*/
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   204
static void preinit_state (lua_State *L, global_State *g) {
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   205
  G(L) = g;
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   206
  L->stack = NULL;
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   207
  L->ci = NULL;
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   208
  L->stacksize = 0;
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   209
  L->errorJmp = NULL;
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   210
  L->nCcalls = 0;
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   211
  L->hook = NULL;
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   212
  L->hookmask = 0;
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   213
  L->basehookcount = 0;
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   214
  L->allowhook = 1;
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   215
  resethookcount(L);
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   216
  L->openupval = NULL;
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   217
  L->nny = 1;
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   218
  L->status = LUA_OK;
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   219
  L->errfunc = 0;
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   220
}
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diff changeset
   221
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diff changeset
   222
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   223
static void close_state (lua_State *L) {
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   224
  global_State *g = G(L);
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   225
  luaF_close(L, L->stack);  /* close all upvalues for this thread */
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parents:
diff changeset
   226
  luaC_freeallobjects(L);  /* collect all objects */
d7ee4e2ed49d Initial work.
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parents:
diff changeset
   227
  if (g->version)  /* closing a fully built state? */
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diff changeset
   228
    luai_userstateclose(L);
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   229
  luaM_freearray(L, G(L)->strt.hash, G(L)->strt.size);
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diff changeset
   230
  luaZ_freebuffer(L, &g->buff);
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diff changeset
   231
  freestack(L);
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   232
  lua_assert(gettotalbytes(g) == sizeof(LG));
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diff changeset
   233
  (*g->frealloc)(g->ud, fromstate(L), sizeof(LG), 0);  /* free main block */
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diff changeset
   234
}
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diff changeset
   235
d7ee4e2ed49d Initial work.
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diff changeset
   236
d7ee4e2ed49d Initial work.
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   237
LUA_API lua_State *lua_newthread (lua_State *L) {
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diff changeset
   238
  lua_State *L1;
d7ee4e2ed49d Initial work.
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parents:
diff changeset
   239
  lua_lock(L);
d7ee4e2ed49d Initial work.
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parents:
diff changeset
   240
  luaC_checkGC(L);
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diff changeset
   241
  L1 = &luaC_newobj(L, LUA_TTHREAD, sizeof(LX), NULL, offsetof(LX, l))->th;
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parents:
diff changeset
   242
  setthvalue(L, L->top, L1);
d7ee4e2ed49d Initial work.
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parents:
diff changeset
   243
  api_incr_top(L);
d7ee4e2ed49d Initial work.
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parents:
diff changeset
   244
  preinit_state(L1, G(L));
d7ee4e2ed49d Initial work.
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diff changeset
   245
  L1->hookmask = L->hookmask;
d7ee4e2ed49d Initial work.
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parents:
diff changeset
   246
  L1->basehookcount = L->basehookcount;
d7ee4e2ed49d Initial work.
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parents:
diff changeset
   247
  L1->hook = L->hook;
d7ee4e2ed49d Initial work.
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parents:
diff changeset
   248
  resethookcount(L1);
d7ee4e2ed49d Initial work.
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parents:
diff changeset
   249
  luai_userstatethread(L, L1);
d7ee4e2ed49d Initial work.
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diff changeset
   250
  stack_init(L1, L);  /* init stack */
d7ee4e2ed49d Initial work.
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parents:
diff changeset
   251
  lua_unlock(L);
d7ee4e2ed49d Initial work.
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diff changeset
   252
  return L1;
d7ee4e2ed49d Initial work.
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parents:
diff changeset
   253
}
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diff changeset
   254
d7ee4e2ed49d Initial work.
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parents:
diff changeset
   255
d7ee4e2ed49d Initial work.
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diff changeset
   256
void luaE_freethread (lua_State *L, lua_State *L1) {
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parents:
diff changeset
   257
  LX *l = fromstate(L1);
d7ee4e2ed49d Initial work.
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diff changeset
   258
  luaF_close(L1, L1->stack);  /* close all upvalues for this thread */
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parents:
diff changeset
   259
  lua_assert(L1->openupval == NULL);
d7ee4e2ed49d Initial work.
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parents:
diff changeset
   260
  luai_userstatefree(L, L1);
d7ee4e2ed49d Initial work.
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parents:
diff changeset
   261
  freestack(L1);
d7ee4e2ed49d Initial work.
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parents:
diff changeset
   262
  luaM_free(L, l);
d7ee4e2ed49d Initial work.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   263
}
d7ee4e2ed49d Initial work.
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diff changeset
   264
d7ee4e2ed49d Initial work.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   265
d7ee4e2ed49d Initial work.
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parents:
diff changeset
   266
LUA_API lua_State *lua_newstate (lua_Alloc f, void *ud) {
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parents:
diff changeset
   267
  int i;
d7ee4e2ed49d Initial work.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   268
  lua_State *L;
d7ee4e2ed49d Initial work.
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parents:
diff changeset
   269
  global_State *g;
d7ee4e2ed49d Initial work.
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   270
  LG *l = cast(LG *, (*f)(ud, NULL, LUA_TTHREAD, sizeof(LG)));
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parents:
diff changeset
   271
  if (l == NULL) return NULL;
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   272
  L = &l->l.l;
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   273
  g = &l->g;
d7ee4e2ed49d Initial work.
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diff changeset
   274
  L->next = NULL;
d7ee4e2ed49d Initial work.
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parents:
diff changeset
   275
  L->tt = LUA_TTHREAD;
d7ee4e2ed49d Initial work.
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parents:
diff changeset
   276
  g->currentwhite = bit2mask(WHITE0BIT, FIXEDBIT);
d7ee4e2ed49d Initial work.
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parents:
diff changeset
   277
  L->marked = luaC_white(g);
d7ee4e2ed49d Initial work.
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parents:
diff changeset
   278
  g->gckind = KGC_NORMAL;
d7ee4e2ed49d Initial work.
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parents:
diff changeset
   279
  preinit_state(L, g);
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diff changeset
   280
  g->frealloc = f;
d7ee4e2ed49d Initial work.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   281
  g->ud = ud;
d7ee4e2ed49d Initial work.
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parents:
diff changeset
   282
  g->mainthread = L;
d7ee4e2ed49d Initial work.
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parents:
diff changeset
   283
  g->seed = makeseed(L);
d7ee4e2ed49d Initial work.
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parents:
diff changeset
   284
  g->uvhead.u.l.prev = &g->uvhead;
d7ee4e2ed49d Initial work.
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parents:
diff changeset
   285
  g->uvhead.u.l.next = &g->uvhead;
d7ee4e2ed49d Initial work.
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parents:
diff changeset
   286
  g->gcrunning = 0;  /* no GC while building state */
d7ee4e2ed49d Initial work.
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parents:
diff changeset
   287
  g->GCestimate = 0;
d7ee4e2ed49d Initial work.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   288
  g->strt.size = 0;
d7ee4e2ed49d Initial work.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   289
  g->strt.nuse = 0;
d7ee4e2ed49d Initial work.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   290
  g->strt.hash = NULL;
d7ee4e2ed49d Initial work.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   291
  setnilvalue(&g->l_registry);
d7ee4e2ed49d Initial work.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   292
  luaZ_initbuffer(L, &g->buff);
d7ee4e2ed49d Initial work.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   293
  g->panic = NULL;
d7ee4e2ed49d Initial work.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   294
  g->version = NULL;
d7ee4e2ed49d Initial work.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   295
  g->gcstate = GCSpause;
d7ee4e2ed49d Initial work.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   296
  g->allgc = NULL;
d7ee4e2ed49d Initial work.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   297
  g->finobj = NULL;
d7ee4e2ed49d Initial work.
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parents:
diff changeset
   298
  g->tobefnz = NULL;
d7ee4e2ed49d Initial work.
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parents:
diff changeset
   299
  g->sweepgc = g->sweepfin = NULL;
d7ee4e2ed49d Initial work.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   300
  g->gray = g->grayagain = NULL;
d7ee4e2ed49d Initial work.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   301
  g->weak = g->ephemeron = g->allweak = NULL;
d7ee4e2ed49d Initial work.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   302
  g->totalbytes = sizeof(LG);
d7ee4e2ed49d Initial work.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   303
  g->GCdebt = 0;
d7ee4e2ed49d Initial work.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   304
  g->gcpause = LUAI_GCPAUSE;
d7ee4e2ed49d Initial work.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   305
  g->gcmajorinc = LUAI_GCMAJOR;
d7ee4e2ed49d Initial work.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   306
  g->gcstepmul = LUAI_GCMUL;
d7ee4e2ed49d Initial work.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   307
  for (i=0; i < LUA_NUMTAGS; i++) g->mt[i] = NULL;
d7ee4e2ed49d Initial work.
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parents:
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  if (luaD_rawrunprotected(L, f_luaopen, NULL) != LUA_OK) {
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    /* memory allocation error: free partial state */
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    close_state(L);
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    L = NULL;
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  }
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  return L;
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}
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LUA_API void lua_close (lua_State *L) {
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  L = G(L)->mainthread;  /* only the main thread can be closed */
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  lua_lock(L);
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  close_state(L);
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}
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