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ldebug.c-Dateireferenz
#include <stdarg.h>
#include <stddef.h>
#include <string.h>
#include "lua.h"
#include "lapi.h"
#include "lcode.h"
#include "ldebug.h"
#include "ldo.h"
#include "lfunc.h"
#include "lobject.h"
#include "lopcodes.h"
#include "lstate.h"
#include "lstring.h"
#include "ltable.h"
#include "ltm.h"
#include "lvm.h"
+ Include-Abhängigkeitsdiagramm für ldebug.c:

gehe zum Quellcode dieser Datei

Makrodefinitionen

#define ldebug_c
 
#define LUA_CORE
 
#define check(x)   if (!(x)) return 0;
 
#define checkjump(pt, pc)   check(0 <= pc && pc < pt->sizecode)
 
#define checkreg(pt, reg)   check((reg) < (pt)->maxstacksize)
 
#define checkopenop(pt, pc)   luaG_checkopenop((pt)->code[(pc)+1])
 

Funktionen

static const char * getfuncname (lua_State *L, CallInfo *ci, const char **name)
 
static int currentpc (lua_State *L, CallInfo *ci)
 
static int currentline (lua_State *L, CallInfo *ci)
 
LUA_API int lua_sethook (lua_State *L, lua_Hook func, int mask, int count)
 
LUA_API lua_Hook lua_gethook (lua_State *L)
 
LUA_API int lua_gethookmask (lua_State *L)
 
LUA_API int lua_gethookcount (lua_State *L)
 
LUA_API int lua_getstack (lua_State *L, int level, lua_Debug *ar)
 
static Protogetluaproto (CallInfo *ci)
 
static const char * findlocal (lua_State *L, CallInfo *ci, int n)
 
LUA_API const char * lua_getlocal (lua_State *L, const lua_Debug *ar, int n)
 
LUA_API const char * lua_setlocal (lua_State *L, const lua_Debug *ar, int n)
 
static void funcinfo (lua_Debug *ar, Closure *cl)
 
static void info_tailcall (lua_Debug *ar)
 
static void collectvalidlines (lua_State *L, Closure *f)
 
static int auxgetinfo (lua_State *L, const char *what, lua_Debug *ar, Closure *f, CallInfo *ci)
 
LUA_API int lua_getinfo (lua_State *L, const char *what, lua_Debug *ar)
 
static int precheck (const Proto *pt)
 
LUAI_FUNC int luaG_checkopenop (Instruction i)
 
static int checkArgMode (const Proto *pt, int r, enum OpArgMask mode)
 
static Instruction symbexec (const Proto *pt, int lastpc, int reg)
 
LUAI_FUNC int luaG_checkcode (const Proto *pt)
 
static const char * kname (Proto *p, int c)
 
static const char * getobjname (lua_State *L, CallInfo *ci, int stackpos, const char **name)
 
static int isinstack (CallInfo *ci, const TValue *o)
 
LUAI_FUNC void luaG_typeerror (lua_State *L, const TValue *o, const char *op)
 
LUAI_FUNC void luaG_concaterror (lua_State *L, StkId p1, StkId p2)
 
LUAI_FUNC void luaG_aritherror (lua_State *L, const TValue *p1, const TValue *p2)
 
LUAI_FUNC int luaG_ordererror (lua_State *L, const TValue *p1, const TValue *p2)
 
static void addinfo (lua_State *L, const char *msg)
 
LUAI_FUNC void luaG_errormsg (lua_State *L)
 
LUAI_FUNC void luaG_runerror (lua_State *L, const char *fmt,...)
 

Makro-Dokumentation

#define check (   x)    if (!(x)) return 0;

Definiert in Zeile 268 der Datei ldebug.c.

#define checkjump (   pt,
  pc 
)    check(0 <= pc && pc < pt->sizecode)

Definiert in Zeile 270 der Datei ldebug.c.

#define checkopenop (   pt,
  pc 
)    luaG_checkopenop((pt)->code[(pc)+1])

Definiert in Zeile 288 der Datei ldebug.c.

#define checkreg (   pt,
  reg 
)    check((reg) < (pt)->maxstacksize)

Definiert in Zeile 272 der Datei ldebug.c.

#define ldebug_c

Definiert in Zeile 13 der Datei ldebug.c.

#define LUA_CORE

Definiert in Zeile 14 der Datei ldebug.c.

Dokumentation der Funktionen

static void addinfo ( lua_State L,
const char *  msg 
)
static

Definiert in Zeile 607 der Datei ldebug.c.

607  {
608  CallInfo *ci = L->ci;
609  if (isLua(ci)) { /* is Lua code? */
610  char buff[LUA_IDSIZE]; /* add file:line information */
611  int line = currentline(L, ci);
612  luaO_chunkid(buff, getstr(getluaproto(ci)->source), LUA_IDSIZE);
613  luaO_pushfstring(L, "%s:%d: %s", buff, line, msg);
614  }
615 }
static int auxgetinfo ( lua_State L,
const char *  what,
lua_Debug ar,
Closure f,
CallInfo ci 
)
static

Definiert in Zeile 193 der Datei ldebug.c.

194  {
195  int status = 1;
196  if (f == NULL) {
197  info_tailcall(ar);
198  return status;
199  }
200  for (; *what; what++) {
201  switch (*what) {
202  case 'S': {
203  funcinfo(ar, f);
204  break;
205  }
206  case 'l': {
207  ar->currentline = (ci) ? currentline(L, ci) : -1;
208  break;
209  }
210  case 'u': {
211  ar->nups = f->c.nupvalues;
212  break;
213  }
214  case 'n': {
215  ar->namewhat = (ci) ? getfuncname(L, ci, &ar->name) : NULL;
216  if (ar->namewhat == NULL) {
217  ar->namewhat = ""; /* not found */
218  ar->name = NULL;
219  }
220  break;
221  }
222  case 'L':
223  case 'f': /* handled by lua_getinfo */
224  break;
225  default: status = 0; /* invalid option */
226  }
227  }
228  return status;
229 }
static int checkArgMode ( const Proto pt,
int  r,
enum OpArgMask  mode 
)
static

Definiert in Zeile 304 der Datei ldebug.c.

304  {
305  switch (mode) {
306  case OpArgN: check(r == 0); break;
307  case OpArgU: break;
308  case OpArgR: checkreg(pt, r); break;
309  case OpArgK:
310  check(ISK(r) ? INDEXK(r) < pt->sizek : r < pt->maxstacksize);
311  break;
312  }
313  return 1;
314 }
static void collectvalidlines ( lua_State L,
Closure f 
)
static

Definiert in Zeile 177 der Datei ldebug.c.

177  {
178  if (f == NULL || f->c.isC) {
179  setnilvalue(L->top);
180  }
181  else {
182  Table *t = luaH_new(L, 0, 0);
183  int *lineinfo = f->l.p->lineinfo;
184  int i;
185  for (i=0; i<f->l.p->sizelineinfo; i++)
186  setbvalue(luaH_setnum(L, t, lineinfo[i]), 1);
187  sethvalue(L, L->top, t);
188  }
189  incr_top(L);
190 }
static int currentline ( lua_State L,
CallInfo ci 
)
static

Definiert in Zeile 44 der Datei ldebug.c.

44  {
45  int pc = currentpc(L, ci);
46  if (pc < 0)
47  return -1; /* only active lua functions have current-line information */
48  else
49  return getline(ci_func(ci)->l.p, pc);
50 }
static int currentpc ( lua_State L,
CallInfo ci 
)
static

Definiert in Zeile 36 der Datei ldebug.c.

36  {
37  if (!isLua(ci)) return -1; /* function is not a Lua function? */
38  if (ci == L->ci)
39  ci->savedpc = L->savedpc;
40  return pcRel(ci->savedpc, ci_func(ci)->l.p);
41 }
static const char* findlocal ( lua_State L,
CallInfo ci,
int  n 
)
static

Definiert in Zeile 112 der Datei ldebug.c.

112  {
113  const char *name;
114  Proto *fp = getluaproto(ci);
115  if (fp && (name = luaF_getlocalname(fp, n, currentpc(L, ci))) != NULL)
116  return name; /* is a local variable in a Lua function */
117  else {
118  StkId limit = (ci == L->ci) ? L->top : (ci+1)->func;
119  if (limit - ci->base >= n && n > 0) /* is 'n' inside 'ci' stack? */
120  return "(*temporary)";
121  else
122  return NULL;
123  }
124 }
static void funcinfo ( lua_Debug ar,
Closure cl 
)
static

Definiert in Zeile 150 der Datei ldebug.c.

150  {
151  if (cl->c.isC) {
152  ar->source = "=[C]";
153  ar->linedefined = -1;
154  ar->lastlinedefined = -1;
155  ar->what = "C";
156  }
157  else {
158  ar->source = getstr(cl->l.p->source);
159  ar->linedefined = cl->l.p->linedefined;
160  ar->lastlinedefined = cl->l.p->lastlinedefined;
161  ar->what = (ar->linedefined == 0) ? "main" : "Lua";
162  }
164 }
static const char * getfuncname ( lua_State L,
CallInfo ci,
const char **  name 
)
static

Definiert in Zeile 544 der Datei ldebug.c.

544  {
545  Instruction i;
546  if ((isLua(ci) && ci->tailcalls > 0) || !isLua(ci - 1))
547  return NULL; /* calling function is not Lua (or is unknown) */
548  ci--; /* calling function */
549  i = ci_func(ci)->l.p->code[currentpc(L, ci)];
550  if (GET_OPCODE(i) == OP_CALL || GET_OPCODE(i) == OP_TAILCALL ||
551  GET_OPCODE(i) == OP_TFORLOOP)
552  return getobjname(L, ci, GETARG_A(i), name);
553  else
554  return NULL; /* no useful name can be found */
555 }
static Proto* getluaproto ( CallInfo ci)
static

Definiert in Zeile 107 der Datei ldebug.c.

107  {
108  return (isLua(ci) ? ci_func(ci)->l.p : NULL);
109 }
static const char* getobjname ( lua_State L,
CallInfo ci,
int  stackpos,
const char **  name 
)
static

Definiert in Zeile 497 der Datei ldebug.c.

498  {
499  if (isLua(ci)) { /* a Lua function? */
500  Proto *p = ci_func(ci)->l.p;
501  int pc = currentpc(L, ci);
502  Instruction i;
503  *name = luaF_getlocalname(p, stackpos+1, pc);
504  if (*name) /* is a local? */
505  return "local";
506  i = symbexec(p, pc, stackpos); /* try symbolic execution */
507  lua_assert(pc != -1);
508  switch (GET_OPCODE(i)) {
509  case OP_GETGLOBAL: {
510  int g = GETARG_Bx(i); /* global index */
511  lua_assert(ttisstring(&p->k[g]));
512  *name = svalue(&p->k[g]);
513  return "global";
514  }
515  case OP_MOVE: {
516  int a = GETARG_A(i);
517  int b = GETARG_B(i); /* move from `b' to `a' */
518  if (b < a)
519  return getobjname(L, ci, b, name); /* get name for `b' */
520  break;
521  }
522  case OP_GETTABLE: {
523  int k = GETARG_C(i); /* key index */
524  *name = kname(p, k);
525  return "field";
526  }
527  case OP_GETUPVAL: {
528  int u = GETARG_B(i); /* upvalue index */
529  *name = p->upvalues ? getstr(p->upvalues[u]) : "?";
530  return "upvalue";
531  }
532  case OP_SELF: {
533  int k = GETARG_C(i); /* key index */
534  *name = kname(p, k);
535  return "method";
536  }
537  default: break;
538  }
539  }
540  return NULL; /* no useful name found */
541 }
static void info_tailcall ( lua_Debug ar)
static

Definiert in Zeile 167 der Datei ldebug.c.

167  {
168  ar->name = ar->namewhat = "";
169  ar->what = "tail";
170  ar->lastlinedefined = ar->linedefined = ar->currentline = -1;
171  ar->source = "=(tail call)";
173  ar->nups = 0;
174 }
static int isinstack ( CallInfo ci,
const TValue o 
)
static

Definiert in Zeile 559 der Datei ldebug.c.

559  {
560  StkId p;
561  for (p = ci->base; p < ci->top; p++)
562  if (o == p) return 1;
563  return 0;
564 }
static const char* kname ( Proto p,
int  c 
)
static

Definiert in Zeile 489 der Datei ldebug.c.

489  {
490  if (ISK(c) && ttisstring(&p->k[INDEXK(c)]))
491  return svalue(&p->k[INDEXK(c)]);
492  else
493  return "?";
494 }
LUA_API lua_Hook lua_gethook ( lua_State L)

Definiert in Zeile 69 der Datei ldebug.c.

69  {
70  return L->hook;
71 }
LUA_API int lua_gethookcount ( lua_State L)

Definiert in Zeile 79 der Datei ldebug.c.

79  {
80  return L->basehookcount;
81 }
LUA_API int lua_gethookmask ( lua_State L)

Definiert in Zeile 74 der Datei ldebug.c.

74  {
75  return L->hookmask;
76 }
LUA_API int lua_getinfo ( lua_State L,
const char *  what,
lua_Debug ar 
)

Definiert in Zeile 232 der Datei ldebug.c.

232  {
233  int status;
234  Closure *f = NULL;
235  CallInfo *ci = NULL;
236  lua_lock(L);
237  if (*what == '>') {
238  StkId func = L->top - 1;
239  luai_apicheck(L, ttisfunction(func));
240  what++; /* skip the '>' */
241  f = clvalue(func);
242  L->top--; /* pop function */
243  }
244  else if (ar->i_ci != 0) { /* no tail call? */
245  ci = L->base_ci + ar->i_ci;
247  f = clvalue(ci->func);
248  }
249  status = auxgetinfo(L, what, ar, f, ci);
250  if (strchr(what, 'f')) {
251  if (f == NULL) setnilvalue(L->top);
252  else setclvalue(L, L->top, f);
253  incr_top(L);
254  }
255  if (strchr(what, 'L'))
256  collectvalidlines(L, f);
257  lua_unlock(L);
258  return status;
259 }
LUA_API const char* lua_getlocal ( lua_State L,
const lua_Debug ar,
int  n 
)

Definiert in Zeile 127 der Datei ldebug.c.

127  {
128  CallInfo *ci = L->base_ci + ar->i_ci;
129  const char *name = findlocal(L, ci, n);
130  lua_lock(L);
131  if (name)
132  luaA_pushobject(L, ci->base + (n - 1));
133  lua_unlock(L);
134  return name;
135 }
LUA_API int lua_getstack ( lua_State L,
int  level,
lua_Debug ar 
)

Definiert in Zeile 84 der Datei ldebug.c.

84  {
85  int status;
86  CallInfo *ci;
87  lua_lock(L);
88  for (ci = L->ci; level > 0 && ci > L->base_ci; ci--) {
89  level--;
90  if (f_isLua(ci)) /* Lua function? */
91  level -= ci->tailcalls; /* skip lost tail calls */
92  }
93  if (level == 0 && ci > L->base_ci) { /* level found? */
94  status = 1;
95  ar->i_ci = cast_int(ci - L->base_ci);
96  }
97  else if (level < 0) { /* level is of a lost tail call? */
98  status = 1;
99  ar->i_ci = 0;
100  }
101  else status = 0; /* no such level */
102  lua_unlock(L);
103  return status;
104 }
LUA_API int lua_sethook ( lua_State L,
lua_Hook  func,
int  mask,
int  count 
)

Definiert in Zeile 56 der Datei ldebug.c.

56  {
57  if (func == NULL || mask == 0) { /* turn off hooks? */
58  mask = 0;
59  func = NULL;
60  }
61  L->hook = func;
62  L->basehookcount = count;
63  resethookcount(L);
64  L->hookmask = cast_byte(mask);
65  return 1;
66 }
LUA_API const char* lua_setlocal ( lua_State L,
const lua_Debug ar,
int  n 
)

Definiert in Zeile 138 der Datei ldebug.c.

138  {
139  CallInfo *ci = L->base_ci + ar->i_ci;
140  const char *name = findlocal(L, ci, n);
141  lua_lock(L);
142  if (name)
143  setobjs2s(L, ci->base + (n - 1), L->top - 1);
144  L->top--; /* pop value */
145  lua_unlock(L);
146  return name;
147 }
LUAI_FUNC void luaG_aritherror ( lua_State L,
const TValue p1,
const TValue p2 
)

Definiert in Zeile 588 der Datei ldebug.c.

588  {
589  TValue temp;
590  if (luaV_tonumber(p1, &temp) == NULL)
591  p2 = p1; /* first operand is wrong */
592  luaG_typeerror(L, p2, "perform arithmetic on");
593 }
LUAI_FUNC int luaG_checkcode ( const Proto pt)

Definiert in Zeile 484 der Datei ldebug.c.

484  {
485  return (symbexec(pt, pt->sizecode, NO_REG) != 0);
486 }
LUAI_FUNC int luaG_checkopenop ( Instruction  i)

Definiert in Zeile 290 der Datei ldebug.c.

290  {
291  switch (GET_OPCODE(i)) {
292  case OP_CALL:
293  case OP_TAILCALL:
294  case OP_RETURN:
295  case OP_SETLIST: {
296  check(GETARG_B(i) == 0);
297  return 1;
298  }
299  default: return 0; /* invalid instruction after an open call */
300  }
301 }
LUAI_FUNC void luaG_concaterror ( lua_State L,
StkId  p1,
StkId  p2 
)

Definiert in Zeile 581 der Datei ldebug.c.

581  {
582  if (ttisstring(p1) || ttisnumber(p1)) p1 = p2;
583  lua_assert(!ttisstring(p1) && !ttisnumber(p1));
584  luaG_typeerror(L, p1, "concatenate");
585 }
LUAI_FUNC void luaG_errormsg ( lua_State L)

Definiert in Zeile 618 der Datei ldebug.c.

618  {
619  if (L->errfunc != 0) { /* is there an error handling function? */
620  StkId errfunc = restorestack(L, L->errfunc);
621  if (!ttisfunction(errfunc)) luaD_throw(L, LUA_ERRERR);
622  setobjs2s(L, L->top, L->top - 1); /* move argument */
623  setobjs2s(L, L->top - 1, errfunc); /* push function */
624  incr_top(L);
625  luaD_call(L, L->top - 2, 1); /* call it */
626  }
628 }
LUAI_FUNC int luaG_ordererror ( lua_State L,
const TValue p1,
const TValue p2 
)

Definiert in Zeile 596 der Datei ldebug.c.

596  {
597  const char *t1 = luaT_typenames[ttype(p1)];
598  const char *t2 = luaT_typenames[ttype(p2)];
599  if (t1[2] == t2[2])
600  luaG_runerror(L, "attempt to compare two %s values", t1);
601  else
602  luaG_runerror(L, "attempt to compare %s with %s", t1, t2);
603  return 0;
604 }
LUAI_FUNC void luaG_runerror ( lua_State L,
const char *  fmt,
  ... 
)

Definiert in Zeile 631 der Datei ldebug.c.

631  {
632  va_list argp;
633  va_start(argp, fmt);
634  addinfo(L, luaO_pushvfstring(L, fmt, argp));
635  va_end(argp);
636  luaG_errormsg(L);
637 }
LUAI_FUNC void luaG_typeerror ( lua_State L,
const TValue o,
const char *  op 
)

Definiert in Zeile 567 der Datei ldebug.c.

567  {
568  const char *name = NULL;
569  const char *t = luaT_typenames[ttype(o)];
570  const char *kind = (isinstack(L->ci, o)) ?
571  getobjname(L, L->ci, cast_int(o - L->base), &name) :
572  NULL;
573  if (kind)
574  luaG_runerror(L, "attempt to %s %s " LUA_QS " (a %s value)",
575  op, kind, name, t);
576  else
577  luaG_runerror(L, "attempt to %s a %s value", op, t);
578 }
static int precheck ( const Proto pt)
static

Definiert in Zeile 276 der Datei ldebug.c.

276  {
277  check(pt->maxstacksize <= MAXSTACK);
278  check(pt->numparams+(pt->is_vararg & VARARG_HASARG) <= pt->maxstacksize);
279  check(!(pt->is_vararg & VARARG_NEEDSARG) ||
280  (pt->is_vararg & VARARG_HASARG));
281  check(pt->sizeupvalues <= pt->nups);
282  check(pt->sizelineinfo == pt->sizecode || pt->sizelineinfo == 0);
283  check(pt->sizecode > 0 && GET_OPCODE(pt->code[pt->sizecode-1]) == OP_RETURN);
284  return 1;
285 }
static Instruction symbexec ( const Proto pt,
int  lastpc,
int  reg 
)
static

Definiert in Zeile 317 der Datei ldebug.c.

317  {
318  int pc;
319  int last; /* stores position of last instruction that changed `reg' */
320  last = pt->sizecode-1; /* points to final return (a `neutral' instruction) */
321  check(precheck(pt));
322  for (pc = 0; pc < lastpc; pc++) {
323  Instruction i = pt->code[pc];
324  OpCode op = GET_OPCODE(i);
325  int a = GETARG_A(i);
326  int b = 0;
327  int c = 0;
328  check(op < NUM_OPCODES);
329  checkreg(pt, a);
330  switch (getOpMode(op)) {
331  case iABC: {
332  b = GETARG_B(i);
333  c = GETARG_C(i);
334  check(checkArgMode(pt, b, getBMode(op)));
335  check(checkArgMode(pt, c, getCMode(op)));
336  break;
337  }
338  case iABx: {
339  b = GETARG_Bx(i);
340  if (getBMode(op) == OpArgK) check(b < pt->sizek);
341  break;
342  }
343  case iAsBx: {
344  b = GETARG_sBx(i);
345  if (getBMode(op) == OpArgR) {
346  int dest = pc+1+b;
347  check(0 <= dest && dest < pt->sizecode);
348  if (dest > 0) {
349  int j;
350  /* check that it does not jump to a setlist count; this
351  is tricky, because the count from a previous setlist may
352  have the same value of an invalid setlist; so, we must
353  go all the way back to the first of them (if any) */
354  for (j = 0; j < dest; j++) {
355  Instruction d = pt->code[dest-1-j];
356  if (!(GET_OPCODE(d) == OP_SETLIST && GETARG_C(d) == 0)) break;
357  }
358  /* if 'j' is even, previous value is not a setlist (even if
359  it looks like one) */
360  check((j&1) == 0);
361  }
362  }
363  break;
364  }
365  }
366  if (testAMode(op)) {
367  if (a == reg) last = pc; /* change register `a' */
368  }
369  if (testTMode(op)) {
370  check(pc+2 < pt->sizecode); /* check skip */
371  check(GET_OPCODE(pt->code[pc+1]) == OP_JMP);
372  }
373  switch (op) {
374  case OP_LOADBOOL: {
375  if (c == 1) { /* does it jump? */
376  check(pc+2 < pt->sizecode); /* check its jump */
377  check(GET_OPCODE(pt->code[pc+1]) != OP_SETLIST ||
378  GETARG_C(pt->code[pc+1]) != 0);
379  }
380  break;
381  }
382  case OP_LOADNIL: {
383  if (a <= reg && reg <= b)
384  last = pc; /* set registers from `a' to `b' */
385  break;
386  }
387  case OP_GETUPVAL:
388  case OP_SETUPVAL: {
389  check(b < pt->nups);
390  break;
391  }
392  case OP_GETGLOBAL:
393  case OP_SETGLOBAL: {
394  check(ttisstring(&pt->k[b]));
395  break;
396  }
397  case OP_SELF: {
398  checkreg(pt, a+1);
399  if (reg == a+1) last = pc;
400  break;
401  }
402  case OP_CONCAT: {
403  check(b < c); /* at least two operands */
404  break;
405  }
406  case OP_TFORLOOP: {
407  check(c >= 1); /* at least one result (control variable) */
408  checkreg(pt, a+2+c); /* space for results */
409  if (reg >= a+2) last = pc; /* affect all regs above its base */
410  break;
411  }
412  case OP_FORLOOP:
413  case OP_FORPREP:
414  checkreg(pt, a+3);
415  /* go through */
416  case OP_JMP: {
417  int dest = pc+1+b;
418  /* not full check and jump is forward and do not skip `lastpc'? */
419  if (reg != NO_REG && pc < dest && dest <= lastpc)
420  pc += b; /* do the jump */
421  break;
422  }
423  case OP_CALL:
424  case OP_TAILCALL: {
425  if (b != 0) {
426  checkreg(pt, a+b-1);
427  }
428  c--; /* c = num. returns */
429  if (c == LUA_MULTRET) {
430  check(checkopenop(pt, pc));
431  }
432  else if (c != 0)
433  checkreg(pt, a+c-1);
434  if (reg >= a) last = pc; /* affect all registers above base */
435  break;
436  }
437  case OP_RETURN: {
438  b--; /* b = num. returns */
439  if (b > 0) checkreg(pt, a+b-1);
440  break;
441  }
442  case OP_SETLIST: {
443  if (b > 0) checkreg(pt, a + b);
444  if (c == 0) {
445  pc++;
446  check(pc < pt->sizecode - 1);
447  }
448  break;
449  }
450  case OP_CLOSURE: {
451  int nup, j;
452  check(b < pt->sizep);
453  nup = pt->p[b]->nups;
454  check(pc + nup < pt->sizecode);
455  for (j = 1; j <= nup; j++) {
456  OpCode op1 = GET_OPCODE(pt->code[pc + j]);
457  check(op1 == OP_GETUPVAL || op1 == OP_MOVE);
458  }
459  if (reg != NO_REG) /* tracing? */
460  pc += nup; /* do not 'execute' these pseudo-instructions */
461  break;
462  }
463  case OP_VARARG: {
464  check((pt->is_vararg & VARARG_ISVARARG) &&
465  !(pt->is_vararg & VARARG_NEEDSARG));
466  b--;
467  if (b == LUA_MULTRET) check(checkopenop(pt, pc));
468  checkreg(pt, a+b-1);
469  break;
470  }
471  default: break;
472  }
473  }
474  return pt->code[last];
475 }