ldo.c-Dateireferenz

#include <setjmp.h>
#include <stdlib.h>
#include <string.h>
#include "lua.h"
#include "ldebug.h"
#include "ldo.h"
#include "lfunc.h"
#include "lgc.h"
#include "lmem.h"
#include "lobject.h"
#include "lopcodes.h"
#include "lparser.h"
#include "lstate.h"
#include "lstring.h"
#include "ltable.h"
#include "ltm.h"
#include "lundump.h"
#include "lvm.h"
#include "lzio.h"

Include-Abhängigkeitsdiagramm für ldo.c:

gehe zum Quellcode dieser Datei

Datenstrukturen
struct	lua_longjmp
struct	SParser

Makrodefinitionen
#define	ldo_c
#define	LUA_CORE
#define	inc_ci(L)

Funktionen
LUAI_FUNC void	luaD_seterrorobj (lua_State *L, int errcode, StkId oldtop)
static void	restore_stack_limit (lua_State *L)
static void	resetstack (lua_State *L, int status)
LUAI_FUNC void	luaD_throw (lua_State *L, int errcode)
LUAI_FUNC int	luaD_rawrunprotected (lua_State *L, Pfunc f, void *ud)
static void	correctstack (lua_State *L, TValue *oldstack)
LUAI_FUNC void	luaD_reallocstack (lua_State *L, int newsize)
LUAI_FUNC void	luaD_reallocCI (lua_State *L, int newsize)
LUAI_FUNC void	luaD_growstack (lua_State *L, int n)
static CallInfo *	growCI (lua_State *L)
LUAI_FUNC void	luaD_callhook (lua_State *L, int event, int line)
static StkId	adjust_varargs (lua_State *L, Proto *p, int actual)
static StkId	tryfuncTM (lua_State *L, StkId func)
LUAI_FUNC int	luaD_precall (lua_State *L, StkId func, int nresults)
static StkId	callrethooks (lua_State *L, StkId firstResult)
LUAI_FUNC int	luaD_poscall (lua_State *L, StkId firstResult)
LUAI_FUNC void	luaD_call (lua_State *L, StkId func, int nResults)
static void	resume (lua_State *L, void *ud)
static int	resume_error (lua_State *L, const char *msg)
LUA_API int	lua_resume (lua_State *L, int nargs)
LUA_API int	lua_yield (lua_State *L, int nresults)
LUAI_FUNC int	luaD_pcall (lua_State *L, Pfunc func, void *u, ptrdiff_t old_top, ptrdiff_t ef)
static void	f_parser (lua_State *L, void *ud)
LUAI_FUNC int	luaD_protectedparser (lua_State *L, ZIO *z, const char *name)

Makro-Dokumentation

#define inc_ci

(

L)

Wert:

((L->ci == L->end_ci) ? growCI(L) : \
   (condhardstacktests(luaD_reallocCI(L, L->size_ci)), ++L->ci))

Definiert in Zeile 260 der Datei ldo.c.

#define ldo_c

Definiert in Zeile 12 der Datei ldo.c.

#define LUA_CORE

Definiert in Zeile 13 der Datei ldo.c.

Dokumentation der Funktionen

static StkId adjust_varargs ( lua_State *  L, Proto *  p, int  actual  )

static

Definiert in Zeile 208 der Datei ldo.c.

                                                                 {
  int i;
  int nfixargs = p->numparams;
  Table *htab = NULL;
  StkId base, fixed;
  for (; actual < nfixargs; ++actual)
    setnilvalue(L->top++);
#if defined(LUA_COMPAT_VARARG)
  if (p->is_vararg & VARARG_NEEDSARG) { /* compat. with old-style vararg? */
    int nvar = actual - nfixargs;  /* number of extra arguments */
    lua_assert(p->is_vararg & VARARG_HASARG);
    luaC_checkGC(L);
    luaD_checkstack(L, p->maxstacksize);
    htab = luaH_new(L, nvar, 1);  /* create `arg' table */
    for (i=0; i<nvar; i++)  /* put extra arguments into `arg' table */
      setobj2n(L, luaH_setnum(L, htab, i+1), L->top - nvar + i);
    /* store counter in field `n' */
    setnvalue(luaH_setstr(L, htab, luaS_newliteral(L, "n")), cast_num(nvar));
  }
#endif
  /* move fixed parameters to final position */
  fixed = L->top - actual;  /* first fixed argument */
  base = L->top;  /* final position of first argument */
  for (i=0; i<nfixargs; i++) {
    setobjs2s(L, L->top++, fixed+i);
    setnilvalue(fixed+i);
  }
  /* add `arg' parameter */
  if (htab) {
    sethvalue(L, L->top++, htab);
    lua_assert(iswhite(obj2gco(htab)));
  }
  return base;
}

static StkId callrethooks ( lua_State *  L, StkId  firstResult  )

static

Definiert in Zeile 332 der Datei ldo.c.

                                                            {
  ptrdiff_t fr = savestack(L, firstResult);  /* next call may change stack */
  luaD_callhook(L, LUA_HOOKRET, -1);
  if (f_isLua(L->ci)) {  /* Lua function? */
    while ((L->hookmask & LUA_MASKRET) && L->ci->tailcalls--) /* tail calls */
      luaD_callhook(L, LUA_HOOKTAILRET, -1);
  }
  return restorestack(L, fr);
}

static void correctstack ( lua_State *  L, TValue *  oldstack  )

static

Definiert in Zeile 126 der Datei ldo.c.

                                                          {
  CallInfo *ci;
  GCObject *up;
  L->top = (L->top - oldstack) + L->stack;
  for (up = L->openupval; up != NULL; up = up->gch.next)
    gco2uv(up)->v = (gco2uv(up)->v - oldstack) + L->stack;
  for (ci = L->base_ci; ci <= L->ci; ci++) {
    ci->top = (ci->top - oldstack) + L->stack;
    ci->base = (ci->base - oldstack) + L->stack;
    ci->func = (ci->func - oldstack) + L->stack;
  }
  L->base = (L->base - oldstack) + L->stack;
}

static void f_parser ( lua_State *  L, void *  ud  )

static

Definiert in Zeile 491 der Datei ldo.c.

                                              {
  int i;
  Proto *tf;
  Closure *cl;
  struct SParser *p = cast(struct SParser *, ud);
  int c = luaZ_lookahead(p->z);
  luaC_checkGC(L);
  tf = ((c == LUA_SIGNATURE[0]) ? luaU_undump : luaY_parser)(L, p->z,
                                                             &p->buff, p->name);
  cl = luaF_newLclosure(L, tf->nups, hvalue(gt(L)));
  cl->l.p = tf;
  for (i = 0; i < tf->nups; i++)  /* initialize eventual upvalues */
    cl->l.upvals[i] = luaF_newupval(L);
  setclvalue(L, L->top, cl);
  incr_top(L);
}

static CallInfo* growCI ( lua_State *  L)

static

Definiert in Zeile 169 der Datei ldo.c.

                                       {
  if (L->size_ci > LUAI_MAXCALLS)  /* overflow while handling overflow? */
    luaD_throw(L, LUA_ERRERR);
  else {
    luaD_reallocCI(L, 2*L->size_ci);
    if (L->size_ci > LUAI_MAXCALLS)
      luaG_runerror(L, "stack overflow");
  }
  return ++L->ci;
}

LUA_API int lua_resume	(	lua_State *	L,
		int	nargs
	)

Definiert in Zeile 418 der Datei ldo.c.

                                                 {
  int status;
  lua_lock(L);
  if (L->status != LUA_YIELD && (L->status != 0 || L->ci != L->base_ci))
      return resume_error(L, "cannot resume non-suspended coroutine");
  if (L->nCcalls >= LUAI_MAXCCALLS)
    return resume_error(L, "C stack overflow");
  luai_userstateresume(L, nargs);
  lua_assert(L->errfunc == 0);
  L->baseCcalls = ++L->nCcalls;
  status = luaD_rawrunprotected(L, resume, L->top - nargs);
  if (status != 0) {  /* error? */
    L->status = cast_byte(status);  /* mark thread as `dead' */
    luaD_seterrorobj(L, status, L->top);
    L->ci->top = L->top;
  }
  else {
    lua_assert(L->nCcalls == L->baseCcalls);
    status = L->status;
  }
  --L->nCcalls;
  lua_unlock(L);
  return status;
}

LUA_API int lua_yield	(	lua_State *	L,
		int	nresults
	)

Definiert in Zeile 444 der Datei ldo.c.

                                                   {
  luai_userstateyield(L, nresults);
  lua_lock(L);
  if (L->nCcalls > L->baseCcalls)
    luaG_runerror(L, "attempt to yield across metamethod/C-call boundary");
  L->base = L->top - nresults;  /* protect stack slots below */
  L->status = LUA_YIELD;
  lua_unlock(L);
  return -1;
}

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

Definiert in Zeile 370 der Datei 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);
}

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

Definiert in Zeile 181 der Datei 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);
  }
}

LUAI_FUNC void luaD_growstack	(	lua_State *	L,
		int	n
	)

Definiert in Zeile 161 der Datei ldo.c.

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

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

Definiert in Zeile 456 der Datei 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;
}

LUAI_FUNC int luaD_poscall	(	lua_State *	L,
		StkId	firstResult
	)

Definiert in Zeile 343 der Datei 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 */
}

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

Definiert in Zeile 265 der Datei 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 + p->numparams);
    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;
    }
  }
}

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

Definiert in Zeile 509 der Datei 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;
}

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

Definiert in Zeile 111 der Datei 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;
}

LUAI_FUNC void luaD_reallocCI	(	lua_State *	L,
		int	newsize
	)

Definiert in Zeile 152 der Datei 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;
}

LUAI_FUNC void luaD_reallocstack	(	lua_State *	L,
		int	newsize
	)

Definiert in Zeile 141 der Datei 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);
}

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

Definiert in Zeile 51 der Datei 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;
}

LUAI_FUNC void luaD_throw	(	lua_State *	L,
		int	errcode
	)

Definiert in Zeile 94 der Datei 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); 2DO:JRI
  }
}

static void resetstack ( lua_State *  L, int  status  )

static

Definiert in Zeile 81 der Datei ldo.c.

                                                  {
  L->ci = L->base_ci;
  L->base = L->ci->base;
  luaF_close(L, L->base);  /* close eventual pending closures */
  luaD_seterrorobj(L, status, L->base);
  L->nCcalls = L->baseCcalls;
  L->allowhook = 1;
  restore_stack_limit(L);
  L->errfunc = 0;
  L->errorJmp = NULL;
}

static void restore_stack_limit ( lua_State *  L)

static

Definiert in Zeile 71 der Datei ldo.c.

                                               {
  lua_assert(L->stack_last - L->stack == L->stacksize - EXTRA_STACK - 1);
  if (L->size_ci > LUAI_MAXCALLS) {  /* there was an overflow? */
    int inuse = cast_int(L->ci - L->base_ci);
    if (inuse + 1 < LUAI_MAXCALLS)  /* can `undo' overflow? */
      luaD_reallocCI(L, LUAI_MAXCALLS);
  }
}

static void resume ( lua_State *  L, void *  ud  )

static

Definiert in Zeile 384 der Datei ldo.c.

                                            {
  StkId firstArg = cast(StkId, ud);
  CallInfo *ci = L->ci;
  if (L->status == 0) {  /* start coroutine? */
    lua_assert(ci == L->base_ci && firstArg > L->base);
    if (luaD_precall(L, firstArg - 1, LUA_MULTRET) != PCRLUA)
      return;
  }
  else {  /* resuming from previous yield */
    lua_assert(L->status == LUA_YIELD);
    L->status = 0;
    if (!f_isLua(ci)) {  /* `common' yield? */
      /* finish interrupted execution of `OP_CALL' */
      lua_assert(GET_OPCODE(*((ci-1)->savedpc - 1)) == OP_CALL ||
                 GET_OPCODE(*((ci-1)->savedpc - 1)) == OP_TAILCALL);
      if (luaD_poscall(L, firstArg))  /* complete it... */
        L->top = L->ci->top;  /* and correct top if not multiple results */
    }
    else  /* yielded inside a hook: just continue its execution */
      L->base = L->ci->base;
  }
  luaV_execute(L, cast_int(L->ci - L->base_ci));
}

static int resume_error ( lua_State *  L, const char *  msg  )

static

Definiert in Zeile 409 der Datei ldo.c.

                                                        {
  L->top = L->ci->base;
  setsvalue2s(L, L->top, luaS_new(L, msg));
  incr_top(L);
  lua_unlock(L);
  return LUA_ERRRUN;
}

static StkId tryfuncTM ( lua_State *  L, StkId  func  )

static

Definiert in Zeile 244 der Datei ldo.c.

                                                  {
  const TValue *tm = luaT_gettmbyobj(L, func, TM_CALL);
  StkId p;
  ptrdiff_t funcr = savestack(L, func);
  if (!ttisfunction(tm))
    luaG_typeerror(L, func, "call");
  /* Open a hole inside the stack at `func' */
  for (p = L->top; p > func; p--) setobjs2s(L, p, p-1);
  incr_top(L);
  func = restorestack(L, funcr);  /* previous call may change stack */
  setobj2s(L, func, tm);  /* tag method is the new function to be called */
  return func;
}