6482677868

Committed 11 Oct 2023 12:31PM UTC coverage: 88.235% (-0.06%) from 88.296%

Build # 6482677868

Build Type

push

github

Committed by

Buristan

Commit Message

Fix base register coalescing in side trace.

Thanks to Sergey Kaplun, NiLuJe and Peter Cawley.

(cherry-picked from commit aa2db7ebd)

The previous patch fixed just part of the problem with the register
coalesing. For example, the parent base register may be used inside the
parent or child register sets when it shouldn't. This leads to incorrect
register allocations, which may lead to crashes or undefined behaviour.
This patch fixes it by excluding the parent base register from both
register sets.

The test case for this patch doesn't fail before the commit since it
requires specific register allocation, which is hard to construct and
very fragile. Due to the lack of ideal sync with the upstream
repository, the test is passed before the patch.
It should become correct in future patches.

Resolves tarantool/tarantool#8767
Part of tarantool/tarantool#9145

Sergey Kaplun:
* added the description and the test for the problem

Run Details

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Branch coverage included in aggregate %.

5 of 5 new or added lines in 1 file covered. (100.0%)

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Source File
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73.0

/src/lj_api.c

/*
** Public Lua/C API.
** Copyright (C) 2005-2017 Mike Pall. See Copyright Notice in luajit.h
**
** Major portions taken verbatim or adapted from the Lua interpreter.
** Copyright (C) 1994-2008 Lua.org, PUC-Rio. See Copyright Notice in lua.h
*/

#define lj_api_c
#define LUA_CORE

#include "lj_obj.h"
#include "lj_gc.h"
#include "lj_err.h"
#include "lj_debug.h"
#include "lj_str.h"
#include "lj_tab.h"
#include "lj_func.h"
#include "lj_udata.h"
#include "lj_meta.h"
#include "lj_state.h"
#include "lj_bc.h"
#include "lj_frame.h"
#include "lj_trace.h"
#include "lj_vm.h"
#include "lj_strscan.h"
#include "lj_strfmt.h"

/* -- Common helper functions --------------------------------------------- */

#define lj_checkapi_slot(idx) \
  lj_checkapi((idx) <= (L->top - L->base), "stack slot %d out of range", (idx))

static TValue *index2adr(lua_State *L, int idx)
{
  if (idx > 0) {
    TValue *o = L->base + (idx - 1);
    return o < L->top ? o : niltv(L);
  } else if (idx > LUA_REGISTRYINDEX) {
    lj_checkapi(idx != 0 && -idx <= L->top - L->base,
                "bad stack slot %d", idx);
    return L->top + idx;
  } else if (idx == LUA_GLOBALSINDEX) {
    TValue *o = &G(L)->tmptv;
    settabV(L, o, tabref(L->env));
    return o;
  } else if (idx == LUA_REGISTRYINDEX) {
    return registry(L);
  } else {
    GCfunc *fn = curr_func(L);
    lj_checkapi(fn->c.gct == ~LJ_TFUNC && !isluafunc(fn),
                "calling frame is not a C function");
    if (idx == LUA_ENVIRONINDEX) {
      TValue *o = &G(L)->tmptv;
      settabV(L, o, tabref(fn->c.env));
      return o;
    } else {
      idx = LUA_GLOBALSINDEX - idx;
      return idx <= fn->c.nupvalues ? &fn->c.upvalue[idx-1] : niltv(L);
    }
  }
}

static LJ_AINLINE TValue *index2adr_check(lua_State *L, int idx)
{
  TValue *o = index2adr(L, idx);
  lj_checkapi(o != niltv(L), "invalid stack slot %d", idx);
  return o;
}

static TValue *index2adr_stack(lua_State *L, int idx)
{
  if (idx > 0) {
    TValue *o = L->base + (idx - 1);
    if (o < L->top) {
      return o;
    } else {
      lj_checkapi(0, "invalid stack slot %d", idx);
      return niltv(L);
    }
    return o < L->top ? o : niltv(L);
  } else {
    lj_checkapi(idx != 0 && -idx <= L->top - L->base,
                "invalid stack slot %d", idx);
    return L->top + idx;
  }
}

static GCtab *getcurrenv(lua_State *L)
{
  GCfunc *fn = curr_func(L);
  return fn->c.gct == ~LJ_TFUNC ? tabref(fn->c.env) : tabref(L->env);
}

static void jit_secure_call(lua_State *L, TValue *base, int nres) {
  global_State *g = G(L);
  /* Forbid Lua world re-entrancy while running the trace */
  if (tvref(g->jit_base)) {
    setstrV(L, L->top++, lj_err_str(L, LJ_ERR_JITCALL));
    if (g->panic) g->panic(L);
    exit(EXIT_FAILURE);
  }
  lj_trace_abort(g);  /* Never record across Lua VM entrance */
  lj_vm_call(L, base, nres);
}

/* -- Miscellaneous API functions ----------------------------------------- */

LUA_API int lua_status(lua_State *L)
{
  return L->status;
}

LUA_API int lua_checkstack(lua_State *L, int size)
{
  if (size > LUAI_MAXCSTACK || (L->top - L->base + size) > LUAI_MAXCSTACK) {
    return 0;  /* Stack overflow. */
  } else if (size > 0) {
    lj_state_checkstack(L, (MSize)size);
  }
  return 1;
}

LUALIB_API void luaL_checkstack(lua_State *L, int size, const char *msg)
{
  if (!lua_checkstack(L, size))
    lj_err_callerv(L, LJ_ERR_STKOVM, msg);
}

LUA_API void lua_xmove(lua_State *L, lua_State *to, int n)
{
  TValue *f, *t;
  if (L == to) return;
  lj_checkapi_slot(n);
  lj_checkapi(G(L) == G(to), "move across global states");
  lj_state_checkstack(to, (MSize)n);
  f = L->top;
  t = to->top = to->top + n;
  while (--n >= 0) copyTV(to, --t, --f);
  L->top = f;
}

LUA_API const lua_Number *lua_version(lua_State *L)
{
  static const lua_Number version = LUA_VERSION_NUM;
  UNUSED(L);
  return &version;
}

/* -- Stack manipulation -------------------------------------------------- */

LUA_API int lua_gettop(lua_State *L)
{
  return (int)(L->top - L->base);
}

LUA_API void lua_settop(lua_State *L, int idx)
{
  if (idx >= 0) {
    lj_checkapi(idx <= tvref(L->maxstack) - L->base, "bad stack slot %d", idx);
    if (L->base + idx > L->top) {
      if (L->base + idx >= tvref(L->maxstack))
        lj_state_growstack(L, (MSize)idx - (MSize)(L->top - L->base));
      do { setnilV(L->top++); } while (L->top < L->base + idx);
    } else {
      L->top = L->base + idx;
    }
  } else {
    lj_checkapi(-(idx+1) <= (L->top - L->base), "bad stack slot %d", idx);
    L->top += idx+1;  /* Shrinks top (idx < 0). */
  }
}

LUA_API void lua_remove(lua_State *L, int idx)
{
  TValue *p = index2adr_stack(L, idx);
  while (++p < L->top) copyTV(L, p-1, p);
  L->top--;
}

LUA_API void lua_insert(lua_State *L, int idx)
{
  TValue *q, *p = index2adr_stack(L, idx);
  for (q = L->top; q > p; q--) copyTV(L, q, q-1);
  copyTV(L, p, L->top);
}

static void copy_slot(lua_State *L, TValue *f, int idx)
{
  if (idx == LUA_GLOBALSINDEX) {
    lj_checkapi(tvistab(f), "stack slot %d is not a table", idx);
    /* NOBARRIER: A thread (i.e. L) is never black. */
    setgcref(L->env, obj2gco(tabV(f)));
  } else if (idx == LUA_ENVIRONINDEX) {
    GCfunc *fn = curr_func(L);
    if (fn->c.gct != ~LJ_TFUNC)
      lj_err_msg(L, LJ_ERR_NOENV);
    lj_checkapi(tvistab(f), "stack slot %d is not a table", idx);
    setgcref(fn->c.env, obj2gco(tabV(f)));
    lj_gc_barrier(L, fn, f);
  } else {
    TValue *o = index2adr_check(L, idx);
    copyTV(L, o, f);
    if (idx < LUA_GLOBALSINDEX)  /* Need a barrier for upvalues. */
      lj_gc_barrier(L, curr_func(L), f);
  }
}

LUA_API void lua_replace(lua_State *L, int idx)
{
  lj_checkapi_slot(1);
  copy_slot(L, L->top - 1, idx);
  L->top--;
}

LUA_API void lua_copy(lua_State *L, int fromidx, int toidx)
{
  copy_slot(L, index2adr(L, fromidx), toidx);
}

LUA_API void lua_pushvalue(lua_State *L, int idx)
{
  copyTV(L, L->top, index2adr(L, idx));
  incr_top(L);
}

/* -- Stack getters ------------------------------------------------------- */

LUA_API int lua_type(lua_State *L, int idx)
{
  cTValue *o = index2adr(L, idx);
  if (tvisnumber(o)) {
    return LUA_TNUMBER;
#if LJ_64 && !LJ_GC64
  } else if (tvislightud(o)) {
    return LUA_TLIGHTUSERDATA;
#endif
  } else if (o == niltv(L)) {
    return LUA_TNONE;
  } else {  /* Magic internal/external tag conversion. ORDER LJ_T */
    uint32_t t = ~itype(o);
#if LJ_64
    int tt = (int)((U64x(75a06,98042110) >> 4*t) & 15u);
#else
    int tt = (int)(((t < 8 ? 0x98042110u : 0x75a06u) >> 4*(t&7)) & 15u);
#endif
    lj_assertL(tt != LUA_TNIL || tvisnil(o), "bad tag conversion");
    return tt;
  }
}

LUALIB_API void luaL_checktype(lua_State *L, int idx, int tt)
{
  if (lua_type(L, idx) != tt)
    lj_err_argt(L, idx, tt);
}

LUALIB_API void luaL_checkany(lua_State *L, int idx)
{
  if (index2adr(L, idx) == niltv(L))
    lj_err_arg(L, idx, LJ_ERR_NOVAL);
}

LUA_API const char *lua_typename(lua_State *L, int t)
{
  UNUSED(L);
  return lj_obj_typename[t+1];
}

LUA_API int lua_iscfunction(lua_State *L, int idx)
{
  cTValue *o = index2adr(L, idx);
  return tvisfunc(o) && !isluafunc(funcV(o));
}

LUA_API int lua_isnumber(lua_State *L, int idx)
{
  cTValue *o = index2adr(L, idx);
  TValue tmp;
  return (tvisnumber(o) || (tvisstr(o) && lj_strscan_number(strV(o), &tmp)));
}

LUA_API int lua_isstring(lua_State *L, int idx)
{
  cTValue *o = index2adr(L, idx);
  return (tvisstr(o) || tvisnumber(o));
}

LUA_API int lua_isuserdata(lua_State *L, int idx)
{
  cTValue *o = index2adr(L, idx);
  return (tvisudata(o) || tvislightud(o));
}

LUA_API int lua_rawequal(lua_State *L, int idx1, int idx2)
{
  cTValue *o1 = index2adr(L, idx1);
  cTValue *o2 = index2adr(L, idx2);
  return (o1 == niltv(L) || o2 == niltv(L)) ? 0 : lj_obj_equal(o1, o2);
}

LUA_API int lua_equal(lua_State *L, int idx1, int idx2)
{
  cTValue *o1 = index2adr(L, idx1);
  cTValue *o2 = index2adr(L, idx2);
  if (tvisint(o1) && tvisint(o2)) {
    return intV(o1) == intV(o2);
  } else if (tvisnumber(o1) && tvisnumber(o2)) {
    return numberVnum(o1) == numberVnum(o2);
  } else if (itype(o1) != itype(o2)) {
    return 0;
  } else if (tvispri(o1)) {
    return o1 != niltv(L) && o2 != niltv(L);
#if LJ_64 && !LJ_GC64
  } else if (tvislightud(o1)) {
    return o1->u64 == o2->u64;
#endif
  } else if (gcrefeq(o1->gcr, o2->gcr)) {
    return 1;
  } else if (!tvistabud(o1)) {
    return 0;
  } else {
    TValue *base = lj_meta_equal(L, gcV(o1), gcV(o2), 0);
    if ((uintptr_t)base <= 1) {
      return (int)(uintptr_t)base;
    } else {
      L->top = base+2;
      jit_secure_call(L, base, 1+1);
      L->top -= 2+LJ_FR2;
      return tvistruecond(L->top+1+LJ_FR2);
    }
  }
}

LUA_API int lua_lessthan(lua_State *L, int idx1, int idx2)
{
  cTValue *o1 = index2adr(L, idx1);
  cTValue *o2 = index2adr(L, idx2);
  if (o1 == niltv(L) || o2 == niltv(L)) {
    return 0;
  } else if (tvisint(o1) && tvisint(o2)) {
    return intV(o1) < intV(o2);
  } else if (tvisnumber(o1) && tvisnumber(o2)) {
    return numberVnum(o1) < numberVnum(o2);
  } else {
    TValue *base = lj_meta_comp(L, o1, o2, 0);
    if ((uintptr_t)base <= 1) {
      return (int)(uintptr_t)base;
    } else {
      L->top = base+2;
      jit_secure_call(L, base, 1+1);
      L->top -= 2+LJ_FR2;
      return tvistruecond(L->top+1+LJ_FR2);
    }
  }
}

LUA_API lua_Number lua_tonumber(lua_State *L, int idx)
{
  cTValue *o = index2adr(L, idx);
  TValue tmp;
  if (LJ_LIKELY(tvisnumber(o)))
    return numberVnum(o);
  else if (tvisstr(o) && lj_strscan_num(strV(o), &tmp))
    return numV(&tmp);
  else
    return 0;
}

LUA_API lua_Number lua_tonumberx(lua_State *L, int idx, int *ok)
{
  cTValue *o = index2adr(L, idx);
  TValue tmp;
  if (LJ_LIKELY(tvisnumber(o))) {
    if (ok) *ok = 1;
    return numberVnum(o);
  } else if (tvisstr(o) && lj_strscan_num(strV(o), &tmp)) {
    if (ok) *ok = 1;
    return numV(&tmp);
  } else {
    if (ok) *ok = 0;
    return 0;
  }
}

LUALIB_API lua_Number luaL_checknumber(lua_State *L, int idx)
{
  cTValue *o = index2adr(L, idx);
  TValue tmp;
  if (LJ_LIKELY(tvisnumber(o)))
    return numberVnum(o);
  else if (!(tvisstr(o) && lj_strscan_num(strV(o), &tmp)))
    lj_err_argt(L, idx, LUA_TNUMBER);
  return numV(&tmp);
}

LUALIB_API lua_Number luaL_optnumber(lua_State *L, int idx, lua_Number def)
{
  cTValue *o = index2adr(L, idx);
  TValue tmp;
  if (LJ_LIKELY(tvisnumber(o)))
    return numberVnum(o);
  else if (tvisnil(o))
    return def;
  else if (!(tvisstr(o) && lj_strscan_num(strV(o), &tmp)))
    lj_err_argt(L, idx, LUA_TNUMBER);
  return numV(&tmp);
}

LUA_API lua_Integer lua_tointeger(lua_State *L, int idx)
{
  cTValue *o = index2adr(L, idx);
  TValue tmp;
  lua_Number n;
  if (LJ_LIKELY(tvisint(o))) {
    return intV(o);
  } else if (LJ_LIKELY(tvisnum(o))) {
    n = numV(o);
  } else {
    if (!(tvisstr(o) && lj_strscan_number(strV(o), &tmp)))
      return 0;
    if (tvisint(&tmp))
      return intV(&tmp);
    n = numV(&tmp);
  }
#if LJ_64
  return (lua_Integer)n;
#else
  return lj_num2int(n);
#endif
}

LUA_API lua_Integer lua_tointegerx(lua_State *L, int idx, int *ok)
{
  cTValue *o = index2adr(L, idx);
  TValue tmp;
  lua_Number n;
  if (LJ_LIKELY(tvisint(o))) {
    if (ok) *ok = 1;
    return intV(o);
  } else if (LJ_LIKELY(tvisnum(o))) {
    n = numV(o);
  } else {
    if (!(tvisstr(o) && lj_strscan_number(strV(o), &tmp))) {
      if (ok) *ok = 0;
      return 0;
    }
    if (tvisint(&tmp)) {
      if (ok) *ok = 1;
      return intV(&tmp);
    }
    n = numV(&tmp);
  }
  if (ok) *ok = 1;
#if LJ_64
  return (lua_Integer)n;
#else
  return lj_num2int(n);
#endif
}

LUALIB_API lua_Integer luaL_checkinteger(lua_State *L, int idx)
{
  cTValue *o = index2adr(L, idx);
  TValue tmp;
  lua_Number n;
  if (LJ_LIKELY(tvisint(o))) {
    return intV(o);
  } else if (LJ_LIKELY(tvisnum(o))) {
    n = numV(o);
  } else {
    if (!(tvisstr(o) && lj_strscan_number(strV(o), &tmp)))
      lj_err_argt(L, idx, LUA_TNUMBER);
    if (tvisint(&tmp))
      return (lua_Integer)intV(&tmp);
    n = numV(&tmp);
  }
#if LJ_64
  return (lua_Integer)n;
#else
  return lj_num2int(n);
#endif
}

LUALIB_API lua_Integer luaL_optinteger(lua_State *L, int idx, lua_Integer def)
{
  cTValue *o = index2adr(L, idx);
  TValue tmp;
  lua_Number n;
  if (LJ_LIKELY(tvisint(o))) {
    return intV(o);
  } else if (LJ_LIKELY(tvisnum(o))) {
    n = numV(o);
  } else if (tvisnil(o)) {
    return def;
  } else {
    if (!(tvisstr(o) && lj_strscan_number(strV(o), &tmp)))
      lj_err_argt(L, idx, LUA_TNUMBER);
    if (tvisint(&tmp))
      return (lua_Integer)intV(&tmp);
    n = numV(&tmp);
  }
#if LJ_64
  return (lua_Integer)n;
#else
  return lj_num2int(n);
#endif
}

LUA_API int lua_toboolean(lua_State *L, int idx)
{
  cTValue *o = index2adr(L, idx);
  return tvistruecond(o);
}

LUA_API const char *lua_tolstring(lua_State *L, int idx, size_t *len)
{
  TValue *o = index2adr(L, idx);
  GCstr *s;
  if (LJ_LIKELY(tvisstr(o))) {
    s = strV(o);
  } else if (tvisnumber(o)) {
    lj_gc_check(L);
    o = index2adr(L, idx);  /* GC may move the stack. */
    s = lj_strfmt_number(L, o);
    setstrV(L, o, s);
  } else {
    if (len != NULL) *len = 0;
    return NULL;
  }
  if (len != NULL) *len = s->len;
  return strdata(s);
}

LUA_API uint32_t lua_hashstring(lua_State *L, int idx)
{
  TValue *o = index2adr(L, idx);
  lj_checkapi(tvisstr(o), "stack slot %d is not a string", idx);
  GCstr *s = strV(o);
  if (! strsmart(s))
    return s->hash;
  return lua_hash(strdata(s), s->len);
}

LUALIB_API const char *luaL_checklstring(lua_State *L, int idx, size_t *len)
{
  TValue *o = index2adr(L, idx);
  GCstr *s;
  if (LJ_LIKELY(tvisstr(o))) {
    s = strV(o);
  } else if (tvisnumber(o)) {
    lj_gc_check(L);
    o = index2adr(L, idx);  /* GC may move the stack. */
    s = lj_strfmt_number(L, o);
    setstrV(L, o, s);
  } else {
    lj_err_argt(L, idx, LUA_TSTRING);
  }
  if (len != NULL) *len = s->len;
  return strdata(s);
}

LUALIB_API const char *luaL_optlstring(lua_State *L, int idx,
                                       const char *def, size_t *len)
{
  TValue *o = index2adr(L, idx);
  GCstr *s;
  if (LJ_LIKELY(tvisstr(o))) {
    s = strV(o);
  } else if (tvisnil(o)) {
    if (len != NULL) *len = def ? strlen(def) : 0;
    return def;
  } else if (tvisnumber(o)) {
    lj_gc_check(L);
    o = index2adr(L, idx);  /* GC may move the stack. */
    s = lj_strfmt_number(L, o);
    setstrV(L, o, s);
  } else {
    lj_err_argt(L, idx, LUA_TSTRING);
  }
  if (len != NULL) *len = s->len;
  return strdata(s);
}

LUALIB_API int luaL_checkoption(lua_State *L, int idx, const char *def,
                                const char *const lst[])
{
  ptrdiff_t i;
  const char *s = lua_tolstring(L, idx, NULL);
  if (s == NULL && (s = def) == NULL)
    lj_err_argt(L, idx, LUA_TSTRING);
  for (i = 0; lst[i]; i++)
    if (strcmp(lst[i], s) == 0)
      return (int)i;
  lj_err_argv(L, idx, LJ_ERR_INVOPTM, s);
}

LUA_API size_t lua_objlen(lua_State *L, int idx)
{
  TValue *o = index2adr(L, idx);
  if (tvisstr(o)) {
    return strV(o)->len;
  } else if (tvistab(o)) {
    return (size_t)lj_tab_len(tabV(o));
  } else if (tvisudata(o)) {
    return udataV(o)->len;
  } else if (tvisnumber(o)) {
    GCstr *s = lj_strfmt_number(L, o);
    setstrV(L, o, s);
    return s->len;
  } else {
    return 0;
  }
}

LUA_API lua_CFunction lua_tocfunction(lua_State *L, int idx)
{
  cTValue *o = index2adr(L, idx);
  if (tvisfunc(o)) {
    BCOp op = bc_op(*mref(funcV(o)->c.pc, BCIns));
    if (op == BC_FUNCC || op == BC_FUNCCW)
      return funcV(o)->c.f;
  }
  return NULL;
}

LUA_API void *lua_touserdata(lua_State *L, int idx)
{
  cTValue *o = index2adr(L, idx);
  if (tvisudata(o))
    return uddata(udataV(o));
  else if (tvislightud(o))
    return lightudV(G(L), o);
  else
    return NULL;
}

LUA_API lua_State *lua_tothread(lua_State *L, int idx)
{
  cTValue *o = index2adr(L, idx);
  return (!tvisthread(o)) ? NULL : threadV(o);
}

LUA_API const void *lua_topointer(lua_State *L, int idx)
{
  return lj_obj_ptr(G(L), index2adr(L, idx));
}

/* -- Stack setters (object creation) ------------------------------------- */

LUA_API void lua_pushnil(lua_State *L)
{
  setnilV(L->top);
  incr_top(L);
}

LUA_API void lua_pushnumber(lua_State *L, lua_Number n)
{
  setnumV(L->top, n);
  if (LJ_UNLIKELY(tvisnan(L->top)))
    setnanV(L->top);  /* Canonicalize injected NaNs. */
  incr_top(L);
}

LUA_API void lua_pushinteger(lua_State *L, lua_Integer n)
{
  setintptrV(L->top, n);
  incr_top(L);
}

LUA_API void lua_pushlstring(lua_State *L, const char *str, size_t len)
{
  GCstr *s;
  lj_gc_check(L);
  s = lj_str_new(L, str, len);
  setstrV(L, L->top, s);
  incr_top(L);
}

LUA_API void lua_pushstring(lua_State *L, const char *str)
{
  if (str == NULL) {
    setnilV(L->top);
  } else {
    GCstr *s;
    lj_gc_check(L);
    s = lj_str_newz(L, str);
    setstrV(L, L->top, s);
  }
  incr_top(L);
}

LUA_API const char *lua_pushvfstring(lua_State *L, const char *fmt,
                                     va_list argp)
{
  lj_gc_check(L);
  return lj_strfmt_pushvf(L, fmt, argp);
}

LUA_API const char *lua_pushfstring(lua_State *L, const char *fmt, ...)
{
  const char *ret;
  va_list argp;
  lj_gc_check(L);
  va_start(argp, fmt);
  ret = lj_strfmt_pushvf(L, fmt, argp);
  va_end(argp);
  return ret;
}

LUA_API void lua_pushcclosure(lua_State *L, lua_CFunction f, int n)
{
  GCfunc *fn;
  lj_gc_check(L);
  lj_checkapi_slot(n);
  fn = lj_func_newC(L, (MSize)n, getcurrenv(L));
  fn->c.f = f;
  L->top -= n;
  while (n--)
    copyTV(L, &fn->c.upvalue[n], L->top+n);
  setfuncV(L, L->top, fn);
  lj_assertL(iswhite(obj2gco(fn)), "new GC object is not white");
  incr_top(L);
}

LUA_API void lua_pushboolean(lua_State *L, int b)
{
  setboolV(L->top, (b != 0));
  incr_top(L);
}

LUA_API void lua_pushlightuserdata(lua_State *L, void *p)
{
#if LJ_64
  p = lj_lightud_intern(L, p);
#endif
  setrawlightudV(L->top, p);
  incr_top(L);
}

LUA_API void lua_createtable(lua_State *L, int narray, int nrec)
{
  lj_gc_check(L);
  settabV(L, L->top, lj_tab_new_ah(L, narray, nrec));
  incr_top(L);
}

LUALIB_API int luaL_newmetatable(lua_State *L, const char *tname)
{
  GCtab *regt = tabV(registry(L));
  TValue *tv = lj_tab_setstr(L, regt, lj_str_newz(L, tname));
  if (tvisnil(tv)) {
    GCtab *mt = lj_tab_new(L, 0, 1);
    settabV(L, tv, mt);
    settabV(L, L->top++, mt);
    lj_gc_anybarriert(L, regt);
    return 1;
  } else {
    copyTV(L, L->top++, tv);
    return 0;
  }
}

LUA_API int lua_pushthread(lua_State *L)
{
  setthreadV(L, L->top, L);
  incr_top(L);
  return (mainthread(G(L)) == L);
}

LUA_API lua_State *lua_newthread(lua_State *L)
{
  lua_State *L1;
  lj_gc_check(L);
  L1 = lj_state_new(L);
  setthreadV(L, L->top, L1);
  incr_top(L);
  return L1;
}

LUA_API void *lua_newuserdata(lua_State *L, size_t size)
{
  GCudata *ud;
  lj_gc_check(L);
  if (size > LJ_MAX_UDATA)
    lj_err_msg(L, LJ_ERR_UDATAOV);
  ud = lj_udata_new(L, (MSize)size, getcurrenv(L));
  setudataV(L, L->top, ud);
  incr_top(L);
  return uddata(ud);
}

LUA_API void lua_concat(lua_State *L, int n)
{
  lj_checkapi_slot(n);
  if (n >= 2) {
    n--;
    do {
      TValue *top = lj_meta_cat(L, L->top-1, -n);
      if (top == NULL) {
        L->top -= n;
        break;
      }
      n -= (int)(L->top - top);
      L->top = top+2;
      jit_secure_call(L, top, 1+1);
      L->top -= 1+LJ_FR2;
      copyTV(L, L->top-1, L->top+LJ_FR2);
    } while (--n > 0);
  } else if (n == 0) {  /* Push empty string. */
    setstrV(L, L->top, &G(L)->strempty);
    incr_top(L);
  }
  /* else n == 1: nothing to do. */
}

/* -- Object getters ------------------------------------------------------ */

LUA_API void lua_gettable(lua_State *L, int idx)
{
  cTValue *t = index2adr_check(L, idx);
  cTValue *v = lj_meta_tget(L, t, L->top-1);
  if (v == NULL) {
    L->top += 2;
    jit_secure_call(L, L->top-2, 1+1);
    L->top -= 2+LJ_FR2;
    v = L->top+1+LJ_FR2;
  }
  copyTV(L, L->top-1, v);
}

LUA_API void lua_getfield(lua_State *L, int idx, const char *k)
{
  cTValue *v, *t = index2adr_check(L, idx);
  TValue key;
  setstrV(L, &key, lj_str_newz(L, k));
  v = lj_meta_tget(L, t, &key);
  if (v == NULL) {
    L->top += 2;
    jit_secure_call(L, L->top-2, 1+1);
    L->top -= 2+LJ_FR2;
    v = L->top+1+LJ_FR2;
  }
  copyTV(L, L->top, v);
  incr_top(L);
}

LUA_API void lua_rawget(lua_State *L, int idx)
{
  cTValue *t = index2adr(L, idx);
  lj_checkapi(tvistab(t), "stack slot %d is not a table", idx);
  copyTV(L, L->top-1, lj_tab_get(L, tabV(t), L->top-1));
}

LUA_API void lua_rawgeti(lua_State *L, int idx, int n)
{
  cTValue *v, *t = index2adr(L, idx);
  lj_checkapi(tvistab(t), "stack slot %d is not a table", idx);
  v = lj_tab_getint(tabV(t), n);
  if (v) {
    copyTV(L, L->top, v);
  } else {
    setnilV(L->top);
  }
  incr_top(L);
}

LUA_API int lua_getmetatable(lua_State *L, int idx)
{
  cTValue *o = index2adr(L, idx);
  GCtab *mt = NULL;
  if (tvistab(o))
    mt = tabref(tabV(o)->metatable);
  else if (tvisudata(o))
    mt = tabref(udataV(o)->metatable);
  else
    mt = tabref(basemt_obj(G(L), o));
  if (mt == NULL)
    return 0;
  settabV(L, L->top, mt);
  incr_top(L);
  return 1;
}

LUALIB_API int luaL_getmetafield(lua_State *L, int idx, const char *field)
{
  if (lua_getmetatable(L, idx)) {
    cTValue *tv = lj_tab_getstr(tabV(L->top-1), lj_str_newz(L, field));
    if (tv && !tvisnil(tv)) {
      copyTV(L, L->top-1, tv);
      return 1;
    }
    L->top--;
  }
  return 0;
}

LUA_API void lua_getfenv(lua_State *L, int idx)
{
  cTValue *o = index2adr_check(L, idx);
  if (tvisfunc(o)) {
    settabV(L, L->top, tabref(funcV(o)->c.env));
  } else if (tvisudata(o)) {
    settabV(L, L->top, tabref(udataV(o)->env));
  } else if (tvisthread(o)) {
    settabV(L, L->top, tabref(threadV(o)->env));
  } else {
    setnilV(L->top);
  }
  incr_top(L);
}

LUA_API int lua_next(lua_State *L, int idx)
{
  cTValue *t = index2adr(L, idx);
  int more;
  lj_checkapi(tvistab(t), "stack slot %d is not a table", idx);
  more = lj_tab_next(L, tabV(t), L->top-1);
  if (more) {
    incr_top(L);  /* Return new key and value slot. */
  } else {  /* End of traversal. */
    L->top--;  /* Remove key slot. */
  }
  return more;
}

LUA_API const char *lua_getupvalue(lua_State *L, int idx, int n)
{
  TValue *val;
  GCobj *o;
  const char *name = lj_debug_uvnamev(index2adr(L, idx), (uint32_t)(n-1), &val, &o);
  if (name) {
    copyTV(L, L->top, val);
    incr_top(L);
  }
  return name;
}

LUA_API void *lua_upvalueid(lua_State *L, int idx, int n)
{
  GCfunc *fn = funcV(index2adr(L, idx));
  n--;
  lj_checkapi((uint32_t)n < fn->l.nupvalues, "bad upvalue %d", n);
  return isluafunc(fn) ? (void *)gcref(fn->l.uvptr[n]) :
                         (void *)&fn->c.upvalue[n];
}

LUA_API void lua_upvaluejoin(lua_State *L, int idx1, int n1, int idx2, int n2)
{
  GCfunc *fn1 = funcV(index2adr(L, idx1));
  GCfunc *fn2 = funcV(index2adr(L, idx2));
  n1--; n2--;
  lj_checkapi(isluafunc(fn1), "stack slot %d is not a Lua function", idx1);
  lj_checkapi(isluafunc(fn2), "stack slot %d is not a Lua function", idx2);
  lj_checkapi((uint32_t)n1 < fn1->l.nupvalues, "bad upvalue %d", n1+1);
  lj_checkapi((uint32_t)n2 < fn2->l.nupvalues, "bad upvalue %d", n2+1);
  setgcrefr(fn1->l.uvptr[n1], fn2->l.uvptr[n2]);
  lj_gc_objbarrier(L, fn1, gcref(fn1->l.uvptr[n1]));
}

LUALIB_API void *luaL_testudata(lua_State *L, int idx, const char *tname)
{
  cTValue *o = index2adr(L, idx);
  if (tvisudata(o)) {
    GCudata *ud = udataV(o);
    cTValue *tv = lj_tab_getstr(tabV(registry(L)), lj_str_newz(L, tname));
    if (tv && tvistab(tv) && tabV(tv) == tabref(ud->metatable))
      return uddata(ud);
  }
  return NULL;  /* value is not a userdata with a metatable */
}

LUALIB_API void *luaL_checkudata(lua_State *L, int idx, const char *tname)
{
  void *p = luaL_testudata(L, idx, tname);
  if (!p) lj_err_argtype(L, idx, tname);
  return p;
}

/* -- Object setters ------------------------------------------------------ */

LUA_API void lua_settable(lua_State *L, int idx)
{
  TValue *o;
  cTValue *t = index2adr_check(L, idx);
  lj_checkapi_slot(2);
  o = lj_meta_tset(L, t, L->top-2);
  if (o) {
    /* NOBARRIER: lj_meta_tset ensures the table is not black. */
    L->top -= 2;
    copyTV(L, o, L->top+1);
  } else {
    TValue *base = L->top;
    copyTV(L, base+2, base-3-2*LJ_FR2);
    L->top = base+3;
    jit_secure_call(L, base, 0+1);
    L->top -= 3+LJ_FR2;
  }
}

LUA_API void lua_setfield(lua_State *L, int idx, const char *k)
{
  TValue *o;
  TValue key;
  cTValue *t = index2adr_check(L, idx);
  lj_checkapi_slot(1);
  setstrV(L, &key, lj_str_newz(L, k));
  o = lj_meta_tset(L, t, &key);
  if (o) {
    /* NOBARRIER: lj_meta_tset ensures the table is not black. */
    copyTV(L, o, --L->top);
  } else {
    TValue *base = L->top;
    copyTV(L, base+2, base-3-2*LJ_FR2);
    L->top = base+3;
    jit_secure_call(L, base, 0+1);
    L->top -= 2+LJ_FR2;
  }
}

LUA_API void lua_rawset(lua_State *L, int idx)
{
  GCtab *t = tabV(index2adr(L, idx));
  TValue *dst, *key;
  lj_checkapi_slot(2);
  key = L->top-2;
  dst = lj_tab_set(L, t, key);
  copyTV(L, dst, key+1);
  lj_gc_anybarriert(L, t);
  L->top = key;
}

LUA_API void lua_rawseti(lua_State *L, int idx, int n)
{
  GCtab *t = tabV(index2adr(L, idx));
  TValue *dst, *src;
  lj_checkapi_slot(1);
  dst = lj_tab_setint(L, t, n);
  src = L->top-1;
  copyTV(L, dst, src);
  lj_gc_barriert(L, t, dst);
  L->top = src;
}

LUA_API int lua_setmetatable(lua_State *L, int idx)
{
  global_State *g;
  GCtab *mt;
  cTValue *o = index2adr_check(L, idx);
  lj_checkapi_slot(1);
  if (tvisnil(L->top-1)) {
    mt = NULL;
  } else {
    lj_checkapi(tvistab(L->top-1), "top stack slot is not a table");
    mt = tabV(L->top-1);
  }
  g = G(L);
  if (tvistab(o)) {
    setgcref(tabV(o)->metatable, obj2gco(mt));
    if (mt)
      lj_gc_objbarriert(L, tabV(o), mt);
  } else if (tvisudata(o)) {
    setgcref(udataV(o)->metatable, obj2gco(mt));
    if (mt)
      lj_gc_objbarrier(L, udataV(o), mt);
  } else {
    /* Flush cache, since traces specialize to basemt. But not during __gc. */
    if (lj_trace_flushall(L))
      lj_err_caller(L, LJ_ERR_NOGCMM);
    if (tvisbool(o)) {
      /* NOBARRIER: basemt is a GC root. */
      setgcref(basemt_it(g, LJ_TTRUE), obj2gco(mt));
      setgcref(basemt_it(g, LJ_TFALSE), obj2gco(mt));
    } else {
      /* NOBARRIER: basemt is a GC root. */
      setgcref(basemt_obj(g, o), obj2gco(mt));
    }
  }
  L->top--;
  return 1;
}

LUALIB_API void luaL_setmetatable(lua_State *L, const char *tname)
{
  lua_getfield(L, LUA_REGISTRYINDEX, tname);
  lua_setmetatable(L, -2);
}

LUA_API int lua_setfenv(lua_State *L, int idx)
{
  cTValue *o = index2adr_check(L, idx);
  GCtab *t;
  lj_checkapi_slot(1);
  lj_checkapi(tvistab(L->top-1), "top stack slot is not a table");
  t = tabV(L->top-1);
  if (tvisfunc(o)) {
    setgcref(funcV(o)->c.env, obj2gco(t));
  } else if (tvisudata(o)) {
    setgcref(udataV(o)->env, obj2gco(t));
  } else if (tvisthread(o)) {
    setgcref(threadV(o)->env, obj2gco(t));
  } else {
    L->top--;
    return 0;
  }
  lj_gc_objbarrier(L, gcV(o), t);
  L->top--;
  return 1;
}

LUA_API const char *lua_setupvalue(lua_State *L, int idx, int n)
{
  cTValue *f = index2adr(L, idx);
  TValue *val;
  GCobj *o;
  const char *name;
  lj_checkapi_slot(1);
  name = lj_debug_uvnamev(f, (uint32_t)(n-1), &val, &o);
  if (name) {
    L->top--;
    copyTV(L, val, L->top);
    lj_gc_barrier(L, o, L->top);
  }
  return name;
}

/* -- Calls --------------------------------------------------------------- */

#if LJ_FR2
static TValue *api_call_base(lua_State *L, int nargs)
{
  TValue *o = L->top, *base = o - nargs;
  L->top = o+1;
  for (; o > base; o--) copyTV(L, o, o-1);
  setnilV(o);
  return o+1;
}
#else
#define api_call_base(L, nargs)        (L->top - (nargs))
#endif

LUA_API void lua_call(lua_State *L, int nargs, int nresults)
{
  lj_checkapi(L->status == LUA_OK || L->status == LUA_ERRERR,
              "thread called in wrong state %d", L->status);
  lj_checkapi_slot(nargs+1);
  jit_secure_call(L, api_call_base(L, nargs), nresults+1);
}

LUA_API int lua_pcall(lua_State *L, int nargs, int nresults, int errfunc)
{
  global_State *g = G(L);
  uint8_t oldh = hook_save(g);
  ptrdiff_t ef;
  int status;
  lj_checkapi(L->status == LUA_OK || L->status == LUA_ERRERR,
              "thread called in wrong state %d", L->status);
  lj_checkapi_slot(nargs+1);
  if (errfunc == 0) {
    ef = 0;
  } else {
    cTValue *o = index2adr_stack(L, errfunc);
    ef = savestack(L, o);
  }
  /* Forbid Lua world re-entrancy while running the trace */
  if (tvref(g->jit_base)) {
    setstrV(L, L->top++, lj_err_str(L, LJ_ERR_JITCALL));
    if (g->panic) g->panic(L);
    exit(EXIT_FAILURE);
  }
  lj_trace_abort(g);  /* Never record across Lua VM entrance */
  status = lj_vm_pcall(L, api_call_base(L, nargs), nresults+1, ef);
  if (status) hook_restore(g, oldh);
  return status;
}

static TValue *cpcall(lua_State *L, lua_CFunction func, void *ud)
{
  GCfunc *fn = lj_func_newC(L, 0, getcurrenv(L));
  TValue *top = L->top;
  fn->c.f = func;
  setfuncV(L, top++, fn);
  if (LJ_FR2) setnilV(top++);
#if LJ_64
  ud = lj_lightud_intern(L, ud);
#endif
  setrawlightudV(top++, ud);
  cframe_nres(L->cframe) = 1+0;  /* Zero results. */
  L->top = top;
  return top-1;  /* Now call the newly allocated C function. */
}

LUA_API int lua_cpcall(lua_State *L, lua_CFunction func, void *ud)
{
  global_State *g = G(L);
  uint8_t oldh = hook_save(g);
  int status;
  lj_checkapi(L->status == LUA_OK || L->status == LUA_ERRERR,
              "thread called in wrong state %d", L->status);
  /* Forbid Lua world re-entrancy while running the trace */
  if (tvref(g->jit_base)) {
    setstrV(L, L->top++, lj_err_str(L, LJ_ERR_JITCALL));
    if (g->panic) g->panic(L);
    exit(EXIT_FAILURE);
  }
  lj_trace_abort(g);  /* Never record across Lua VM entrance */
  status = lj_vm_cpcall(L, func, ud, cpcall);
  if (status) hook_restore(g, oldh);
  return status;
}

LUALIB_API int luaL_callmeta(lua_State *L, int idx, const char *field)
{
  if (luaL_getmetafield(L, idx, field)) {
    TValue *top = L->top--;
    if (LJ_FR2) setnilV(top++);
    copyTV(L, top++, index2adr(L, idx));
    L->top = top;
    jit_secure_call(L, top-1, 1+1);
    return 1;
  }
  return 0;
}

/* -- Coroutine yield and resume ------------------------------------------ */

LUA_API int lua_isyieldable(lua_State *L)
{
  return cframe_canyield(L->cframe);
}

LUA_API int lua_yield(lua_State *L, int nresults)
{
  void *cf = L->cframe;
  global_State *g = G(L);
  if (cframe_canyield(cf)) {
    cf = cframe_raw(cf);
    if (!hook_active(g)) {  /* Regular yield: move results down if needed. */
      cTValue *f = L->top - nresults;
      if (f > L->base) {
        TValue *t = L->base;
        while (--nresults >= 0) copyTV(L, t++, f++);
        L->top = t;
      }
      L->cframe = NULL;
      L->status = LUA_YIELD;
      return -1;
    } else {  /* Yield from hook: add a pseudo-frame. */
      TValue *top = L->top;
      hook_leave(g);
      (top++)->u64 = cframe_multres(cf);
      setcont(top, lj_cont_hook);
      if (LJ_FR2) top++;
      setframe_pc(top, cframe_pc(cf)-1);
      top++;
      setframe_gc(top, obj2gco(L), LJ_TTHREAD);
      if (LJ_FR2) top++;
      setframe_ftsz(top, ((char *)(top+1)-(char *)L->base)+FRAME_CONT);
      L->top = L->base = top+1;
#if ((defined(__GNUC__) || defined(__clang__)) && (LJ_TARGET_X64 || defined(LUAJIT_UNWIND_EXTERNAL)) && !LJ_NO_UNWIND) || LJ_TARGET_WINDOWS
      lj_err_throw(L, LUA_YIELD);
#else
      L->cframe = NULL;
      L->status = LUA_YIELD;
      lj_vm_unwind_c(cf, LUA_YIELD);
#endif
    }
  }
  lj_err_msg(L, LJ_ERR_CYIELD);
  return 0;  /* unreachable */
}

LUA_API int lua_resume(lua_State *L, int nargs)
{
  if (L->cframe == NULL && L->status <= LUA_YIELD)
    return lj_vm_resume(L,
      L->status == LUA_OK ? api_call_base(L, nargs) : L->top - nargs,
      0, 0);
  L->top = L->base;
  setstrV(L, L->top, lj_err_str(L, LJ_ERR_COSUSP));
  incr_top(L);
  return LUA_ERRRUN;
}

/* -- GC and memory management -------------------------------------------- */

LUA_API int lua_gc(lua_State *L, int what, int data)
{
  global_State *g = G(L);
  int res = 0;
  switch (what) {
  case LUA_GCSTOP:
    g->gc.threshold = LJ_MAX_MEM;
    break;
  case LUA_GCRESTART:
    g->gc.threshold = data == -1 ? (g->gc.total/100)*g->gc.pause : g->gc.total;
    break;
  case LUA_GCCOLLECT:
    lj_gc_fullgc(L);
    break;
  case LUA_GCCOUNT:
    res = (int)(g->gc.total >> 10);
    break;
  case LUA_GCCOUNTB:
    res = (int)(g->gc.total & 0x3ff);
    break;
  case LUA_GCSTEP: {
    GCSize a = (GCSize)data << 10;
    g->gc.threshold = (a <= g->gc.total) ? (g->gc.total - a) : 0;
    while (g->gc.total >= g->gc.threshold)
      if (lj_gc_step(L) > 0) {
        res = 1;
        break;
      }
    break;
  }
  case LUA_GCSETPAUSE:
    res = (int)(g->gc.pause);
    g->gc.pause = (MSize)data;
    break;
  case LUA_GCSETSTEPMUL:
    res = (int)(g->gc.stepmul);
    g->gc.stepmul = (MSize)data;
    break;
  case LUA_GCISRUNNING:
    res = (g->gc.threshold != LJ_MAX_MEM);
    break;
  default:
    res = -1;  /* Invalid option. */
  }
  return res;
}

LUA_API lua_Alloc lua_getallocf(lua_State *L, void **ud)
{
  global_State *g = G(L);
  if (ud) *ud = g->allocd;
  return g->allocf;
}

LUA_API void lua_setallocf(lua_State *L, lua_Alloc f, void *ud)
{
  global_State *g = G(L);
  g->allocd = ud;
  g->allocf = f;
}

LUA_API uint32_t lua_hash(const char *str, uint32_t len)
{
  uint32_t h = len, a, b;
  if (len >= 4) {
    a = lj_getu32(str);
    h ^= lj_getu32(str+len-4);
    b = lj_getu32(str+(len>>1)-2);
    h ^= b; h -= lj_rol(b, 14);
    b += lj_getu32(str+(len>>2)-1);
  } else if (len > 0) {
    a = *str;
    h ^= *(str+len-1);
    b = *(str+(len>>1));
    h ^= b; h -= lj_rol(b, 14);
  } else {
    return 0;
  }
  a ^= h; a -= lj_rol(h, 11);
  b ^= a; b -= lj_rol(a, 25);
  h ^= b; h -= lj_rol(b, 16);
  return h;
}

tarantool / luajit / 6482677868

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