ldo.h File Reference

#include "lobject.h"
#include "lstate.h"
#include "lzio.h"

Go to the source code of this file.

Macros
#define	luaD_checkstack(L, n)
#define	incr_top(L)   {luaD_checkstack(L,1); L->top++;}
#define	savestack(L, p)   ((char *)(p) - (char *)L->stack)
#define	restorestack(L, n)   ((TValue *)((char *)L->stack + (n)))
#define	saveci(L, p)   ((char *)(p) - (char *)L->base_ci)
#define	restoreci(L, n)   ((CallInfo *)((char *)L->base_ci + (n)))
#define	PCRLUA   0 /* initiated a call to a Lua function */
#define	PCRC   1 /* did a call to a C function */
#define	PCRYIELD   2 /* C funtion yielded */

Typedefs
typedef void(*	Pfunc) (lua_State *L, void *ud)

Functions
LUAI_FUNC int	luaD_protectedparser (lua_State *L, ZIO *z, const char *name)
LUAI_FUNC void	luaD_callhook (lua_State *L, int event, int line)
LUAI_FUNC int	luaD_precall (lua_State *L, StkId func, int nresults)
LUAI_FUNC void	luaD_call (lua_State *L, StkId func, int nResults)
LUAI_FUNC int	luaD_pcall (lua_State *L, Pfunc func, void *u, ptrdiff_t oldtop, ptrdiff_t ef)
LUAI_FUNC int	luaD_poscall (lua_State *L, StkId firstResult)
LUAI_FUNC void	luaD_reallocCI (lua_State *L, int newsize)
LUAI_FUNC void	luaD_reallocstack (lua_State *L, int newsize)
LUAI_FUNC void	luaD_growstack (lua_State *L, int n)
LUAI_FUNC void	luaD_throw (lua_State *L, int errcode)
LUAI_FUNC int	luaD_rawrunprotected (lua_State *L, Pfunc f, void *ud)
LUAI_FUNC void	luaD_seterrorobj (lua_State *L, int errcode, StkId oldtop)

Macro Definition Documentation

incr_top

#define incr_top

(

L

)

{luaD_checkstack(L,1); L->top++;}

Definition at line 22 of file lua-5.1.5/src/ldo.h.

Referenced by collectvalidlines(), combine(), f_parser(), LoadFunction(), lua_getinfo(), luaG_errormsg(), luaO_pushvfstring(), luaU_undump(), luaY_parser(), open_func(), open_func(), pushstr(), resume_error(), tryfuncTM(), and tryfuncTM().

luaD_checkstack

#define luaD_checkstack	(		L,
			n )

Value:

  if ((char *)L->stack_last - (char *)L->top <= (n)*(int)sizeof(TValue)) \
    luaD_growstack(L, n); \
  else condhardstacktests(luaD_reallocstack(L, L->stacksize - EXTRA_STACK - 1));

Definition at line 16 of file lua-5.1.5/src/ldo.h.

#define luaD_checkstack(L,n)    \
  if ((char *)L->stack_last - (char *)L->top <= (n)*(int)sizeof(TValue)) \
    luaD_growstack(L, n); \
  else condhardstacktests(luaD_reallocstack(L, L->stacksize - EXTRA_STACK - 1));

Referenced by adjust_varargs(), adjust_varargs(), callTM(), callTMres(), lua_checkstack(), luaD_callhook(), luaD_hook(), luaD_hook(), luaD_inctop(), luaD_precall(), luaO_pushvfstring(), luaT_adjustvarargs(), luaV_execute(), and luaV_execute().

PCRC

#define PCRC   1 /* did a call to a C function */

Definition at line 33 of file lua-5.1.5/src/ldo.h.

Referenced by luaD_precall(), and luaV_execute().

PCRLUA

#define PCRLUA   0 /* initiated a call to a Lua function */

Definition at line 32 of file lua-5.1.5/src/ldo.h.

Referenced by luaD_call(), luaD_precall(), luaV_execute(), and resume().

PCRYIELD

#define PCRYIELD   2 /* C funtion yielded */

Definition at line 34 of file lua-5.1.5/src/ldo.h.

Referenced by luaD_precall().

restoreci

#define restoreci	(		L,
			n )   ((CallInfo *)((char *)L->base_ci + (n)))

Definition at line 28 of file lua-5.1.5/src/ldo.h.

Referenced by luaD_pcall().

restorestack

#define restorestack	(		L,
			n )   ((TValue *)((char *)L->stack + (n)))

Definition at line 25 of file lua-5.1.5/src/ldo.h.

Referenced by callrethooks(), callTM(), callTMres(), finishpcallk(), luaD_callhook(), luaD_closeprotected(), luaD_hook(), luaD_hook(), luaD_pcall(), luaD_poscall(), luaD_poscall(), luaD_precall(), luaF_close(), luaG_errormsg(), luaT_callTM(), luaT_callTMres(), moveresults(), recover(), recover(), resume(), resume(), swapextra(), swapextra(), tryfuncTM(), and tryfuncTM().

saveci

#define saveci	(		L,
			p )   ((char *)(p) - (char *)L->base_ci)

Definition at line 27 of file lua-5.1.5/src/ldo.h.

Referenced by luaD_pcall().

savestack

#define savestack	(		L,
			p )   ((char *)(p) - (char *)L->stack)

Definition at line 24 of file lua-5.1.5/src/ldo.h.

Referenced by callrethooks(), callTM(), callTMres(), GCTM(), GCTM(), GCTM(), lua_cpcall(), lua_pcall(), lua_pcallk(), lua_pcallk(), lua_yieldk(), lua_yieldk(), luaD_callhook(), luaD_hook(), luaD_hook(), luaD_poscall(), luaD_poscall(), luaD_precall(), luaD_protectedparser(), luaD_protectedparser(), luaF_close(), luaT_callTM(), luaT_callTMres(), moveresults(), swapextra(), swapextra(), tryfuncTM(), and tryfuncTM().

Typedef Documentation

Pfunc

typedef void(* Pfunc) (lua_State *L, void *ud)

Definition at line 38 of file lua-5.1.5/src/ldo.h.

Function Documentation

luaD_call()

LUAI_FUNC void luaD_call	(	lua_State *	L,
		StkId	func,
		int	nResults )

Definition at line 370 of file lua-5.1.5/src/ldo.c.

                                                        {
  if (++L->nCcalls >= LUAI_MAXCCALLS) {
    if (L->nCcalls == LUAI_MAXCCALLS)
      luaG_runerror(L, "C stack overflow");
    else if (L->nCcalls >= (LUAI_MAXCCALLS + (LUAI_MAXCCALLS>>3)))
      luaD_throw(L, LUA_ERRERR);  /* error while handing stack error */
  }
  if (luaD_precall(L, func, nResults) == PCRLUA)  /* is a Lua function? */
    luaV_execute(L, 1);  /* call it */
  L->nCcalls--;
  luaC_checkGC(L);
}

luaD_callhook()

LUAI_FUNC void luaD_callhook	(	lua_State *	L,
		int	event,
		int	line )

Definition at line 181 of file lua-5.1.5/src/ldo.c.

                                                       {
  lua_Hook hook = L->hook;
  if (hook && L->allowhook) {
    ptrdiff_t top = savestack(L, L->top);
    ptrdiff_t ci_top = savestack(L, L->ci->top);
    lua_Debug ar;
    ar.event = event;
    ar.currentline = line;
    if (event == LUA_HOOKTAILRET)
      ar.i_ci = 0;  /* tail call; no debug information about it */
    else
      ar.i_ci = cast_int(L->ci - L->base_ci);
    luaD_checkstack(L, LUA_MINSTACK);  /* ensure minimum stack size */
    L->ci->top = L->top + LUA_MINSTACK;
    lua_assert(L->ci->top <= L->stack_last);
    L->allowhook = 0;  /* cannot call hooks inside a hook */
    lua_unlock(L);
    (*hook)(L, &ar);
    lua_lock(L);
    lua_assert(!L->allowhook);
    L->allowhook = 1;
    L->ci->top = restorestack(L, ci_top);
    L->top = restorestack(L, top);
  }
}

References lua_State::allowhook, lua_State::base_ci, cast_int, lua_State::ci, lua_Debug::currentline, lua_Debug::event, lua_State::hook, lua_Debug::i_ci, lua_assert, LUA_HOOKTAILRET, lua_lock, LUA_MINSTACK, lua_unlock, luaD_checkstack, restorestack, savestack, lua_State::stack_last, CallInfo::top, and lua_State::top.

Referenced by callrethooks(), luaD_precall(), and traceexec().

luaD_growstack()

LUAI_FUNC void luaD_growstack	(	lua_State *	L,
		int	n )

Definition at line 161 of file lua-5.1.5/src/ldo.c.

                                          {
  if (n <= L->stacksize)  /* double size is enough? */
    luaD_reallocstack(L, 2*L->stacksize);
  else
    luaD_reallocstack(L, L->stacksize + n);
}

luaD_pcall()

LUAI_FUNC int luaD_pcall	(	lua_State *	L,
		Pfunc	func,
		void *	u,
		ptrdiff_t	oldtop,
		ptrdiff_t	ef )

Definition at line 456 of file lua-5.1.5/src/ldo.c.

                                                 {
  int status;
  unsigned short oldnCcalls = L->nCcalls;
  ptrdiff_t old_ci = saveci(L, L->ci);
  lu_byte old_allowhooks = L->allowhook;
  ptrdiff_t old_errfunc = L->errfunc;
  L->errfunc = ef;
  status = luaD_rawrunprotected(L, func, u);
  if (status != 0) {  /* an error occurred? */
    StkId oldtop = restorestack(L, old_top);
    luaF_close(L, oldtop);  /* close eventual pending closures */
    luaD_seterrorobj(L, status, oldtop);
    L->nCcalls = oldnCcalls;
    L->ci = restoreci(L, old_ci);
    L->base = L->ci->base;
    L->savedpc = L->ci->savedpc;
    L->allowhook = old_allowhooks;
    restore_stack_limit(L);
  }
  L->errfunc = old_errfunc;
  return status;
}

luaD_poscall()

LUAI_FUNC int luaD_poscall	(	lua_State *	L,
		StkId	firstResult )

Definition at line 343 of file lua-5.1.5/src/ldo.c.

                                                   {
  StkId res;
  int wanted, i;
  CallInfo *ci;
  if (L->hookmask & LUA_MASKRET)
    firstResult = callrethooks(L, firstResult);
  ci = L->ci--;
  res = ci->func;  /* res == final position of 1st result */
  wanted = ci->nresults;
  L->base = (ci - 1)->base;  /* restore base */
  L->savedpc = (ci - 1)->savedpc;  /* restore savedpc */
  /* move results to correct place */
  for (i = wanted; i != 0 && firstResult < L->top; i--)
    setobjs2s(L, res++, firstResult++);
  while (i-- > 0)
    setnilvalue(res++);
  L->top = res;
  return (wanted - LUA_MULTRET);  /* 0 iff wanted == LUA_MULTRET */
}

luaD_precall()

LUAI_FUNC int luaD_precall	(	lua_State *	L,
		StkId	func,
		int	nresults )

Definition at line 265 of file lua-5.1.5/src/ldo.c.

                                                          {
  LClosure *cl;
  ptrdiff_t funcr;
  if (!ttisfunction(func)) /* `func' is not a function? */
    func = tryfuncTM(L, func);  /* check the `function' tag method */
  funcr = savestack(L, func);
  cl = &clvalue(func)->l;
  L->ci->savedpc = L->savedpc;
  if (!cl->isC) {  /* Lua function? prepare its call */
    CallInfo *ci;
    StkId st, base;
    Proto *p = cl->p;
    luaD_checkstack(L, p->maxstacksize);
    func = restorestack(L, funcr);
    if (!p->is_vararg) {  /* no varargs? */
      base = func + 1;
      if (L->top > base + p->numparams)
        L->top = base + p->numparams;
    }
    else {  /* vararg function */
      int nargs = cast_int(L->top - func) - 1;
      base = adjust_varargs(L, p, nargs);
      func = restorestack(L, funcr);  /* previous call may change the stack */
    }
    ci = inc_ci(L);  /* now `enter' new function */
    ci->func = func;
    L->base = ci->base = base;
    ci->top = L->base + p->maxstacksize;
    lua_assert(ci->top <= L->stack_last);
    L->savedpc = p->code;  /* starting point */
    ci->tailcalls = 0;
    ci->nresults = nresults;
    for (st = L->top; st < ci->top; st++)
      setnilvalue(st);
    L->top = ci->top;
    if (L->hookmask & LUA_MASKCALL) {
      L->savedpc++;  /* hooks assume 'pc' is already incremented */
      luaD_callhook(L, LUA_HOOKCALL, -1);
      L->savedpc--;  /* correct 'pc' */
    }
    return PCRLUA;
  }
  else {  /* if is a C function, call it */
    CallInfo *ci;
    int n;
    luaD_checkstack(L, LUA_MINSTACK);  /* ensure minimum stack size */
    ci = inc_ci(L);  /* now `enter' new function */
    ci->func = restorestack(L, funcr);
    L->base = ci->base = ci->func + 1;
    ci->top = L->top + LUA_MINSTACK;
    lua_assert(ci->top <= L->stack_last);
    ci->nresults = nresults;
    if (L->hookmask & LUA_MASKCALL)
      luaD_callhook(L, LUA_HOOKCALL, -1);
    lua_unlock(L);
    n = (*curr_func(L)->c.f)(L);  /* do the actual call */
    lua_lock(L);
    if (n < 0)  /* yielding? */
      return PCRYIELD;
    else {
      luaD_poscall(L, L->top - n);
      return PCRC;
    }
  }
}

luaD_protectedparser()

LUAI_FUNC int luaD_protectedparser	(	lua_State *	L,
		ZIO *	z,
		const char *	name )

Definition at line 509 of file lua-5.1.5/src/ldo.c.

                                                                  {
  struct SParser p;
  int status;
  p.z = z; p.name = name;
  luaZ_initbuffer(L, &p.buff);
  status = luaD_pcall(L, f_parser, &p, savestack(L, L->top), L->errfunc);
  luaZ_freebuffer(L, &p.buff);
  return status;
}

References SParser::buff, lua_State::errfunc, f_parser(), luaD_pcall(), luaZ_freebuffer, luaZ_initbuffer, name, SParser::name, savestack, lua_State::top, and SParser::z.

Referenced by lua_load(), and lua_load().

luaD_rawrunprotected()

LUAI_FUNC int luaD_rawrunprotected	(	lua_State *	L,
		Pfunc	f,
		void *	ud )

Definition at line 111 of file lua-5.1.5/src/ldo.c.

                                                           {
  struct lua_longjmp lj;
  lj.status = 0;
  lj.previous = L->errorJmp;  /* chain new error handler */
  L->errorJmp = &lj;
  LUAI_TRY(L, &lj,
    (*f)(L, ud);
  );
  L->errorJmp = lj.previous;  /* restore old error handler */
  return lj.status;
}

luaD_reallocCI()

LUAI_FUNC void luaD_reallocCI	(	lua_State *	L,
		int	newsize )

Definition at line 152 of file lua-5.1.5/src/ldo.c.

                                                {
  CallInfo *oldci = L->base_ci;
  luaM_reallocvector(L, L->base_ci, L->size_ci, newsize, CallInfo);
  L->size_ci = newsize;
  L->ci = (L->ci - oldci) + L->base_ci;
  L->end_ci = L->base_ci + L->size_ci - 1;
}

References lua_State::base_ci, lua_State::ci, lua_State::end_ci, luaM_reallocvector, and lua_State::size_ci.

Referenced by checkstacksizes(), growCI(), and restore_stack_limit().

luaD_reallocstack()

LUAI_FUNC void luaD_reallocstack	(	lua_State *	L,
		int	newsize )

Definition at line 141 of file lua-5.1.5/src/ldo.c.

                                                   {
  TValue *oldstack = L->stack;
  int realsize = newsize + 1 + EXTRA_STACK;
  lua_assert(L->stack_last - L->stack == L->stacksize - EXTRA_STACK - 1);
  luaM_reallocvector(L, L->stack, L->stacksize, realsize, TValue);
  L->stacksize = realsize;
  L->stack_last = L->stack+newsize;
  correctstack(L, oldstack);
}

luaD_seterrorobj()

LUAI_FUNC void luaD_seterrorobj	(	lua_State *	L,
		int	errcode,
		StkId	oldtop )

Definition at line 51 of file lua-5.1.5/src/ldo.c.

                                                                {
  switch (errcode) {
    case LUA_ERRMEM: {
      setsvalue2s(L, oldtop, luaS_newliteral(L, MEMERRMSG));
      break;
    }
    case LUA_ERRERR: {
      setsvalue2s(L, oldtop, luaS_newliteral(L, "error in error handling"));
      break;
    }
    case LUA_ERRSYNTAX:
    case LUA_ERRRUN: {
      setobjs2s(L, oldtop, L->top - 1);  /* error message on current top */
      break;
    }
  }
  L->top = oldtop + 1;
}

luaD_throw()

LUAI_FUNC void luaD_throw	(	lua_State *	L,
		int	errcode )

Definition at line 94 of file lua-5.1.5/src/ldo.c.

                                            {
  if (L->errorJmp) {
    L->errorJmp->status = errcode;
    LUAI_THROW(L, L->errorJmp);
  }
  else {
    L->status = cast_byte(errcode);
    if (G(L)->panic) {
      resetstack(L, errcode);
      lua_unlock(L);
      G(L)->panic(L);
    }
    exit(EXIT_FAILURE);
  }
}