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/*
** $Id: lparser.c,v 2.42.1.3 2007/12/28 15:32:23 roberto Exp $
** Lua Parser
** See Copyright Notice in lua.h
*/


#include <string.h>

#define lparser_c
#define LUA_CORE

#include "lua.h"

#include "lcode.h"
#include "ldebug.h"
#include "ldo.h"
#include "lfunc.h"
#include "llex.h"
#include "lmem.h"
#include "lobject.h"
#include "lopcodes.h"
#include "lparser.h"
#include "lstate.h"
#include "lstring.h"
#include "ltable.h"



#define hasmultret(k)		((k) == VCALL || (k) == VVARARG)

#define getlocvar(fs, i)	((fs)->f->locvars[(fs)->actvar[i]])

#define luaY_checklimit(fs,v,l,m)	if ((v)>(l)) errorlimit(fs,l,m)


/*
** nodes for block list (list of active blocks)
*/
typedef struct BlockCnt {
  struct BlockCnt *previous;  /* chain */
  int breaklist;  /* list of jumps out of this loop */
  lu_byte nactvar;  /* # active locals outside the breakable structure */
  lu_byte upval;  /* true if some variable in the block is an upvalue */
  lu_byte isbreakable;  /* true if `block' is a loop */
} BlockCnt;



/*
** prototypes for recursive non-terminal functions
*/
static void chunk (LexState *ls);
static void expr (LexState *ls, expdesc *v);


static void anchor_token (LexState *ls) {
  if (ls->t.token == TK_NAME || ls->t.token == TK_STRING) {
    TString *ts = ls->t.seminfo.ts;
    luaX_newstring(ls, getstr(ts), ts->tsv.len);
  }
}


static void error_expected (LexState *ls, int token) {
  luaX_syntaxerror(ls,
      luaO_pushfstring(ls->L, LUA_QS " expected", luaX_token2str(ls, token)));
}


static void errorlimit (FuncState *fs, int limit, const char *what) {
  const char *msg = (fs->f->linedefined == 0) ?
    luaO_pushfstring(fs->L, "main function has more than %d %s", limit, what) :
    luaO_pushfstring(fs->L, "function at line %d has more than %d %s",
                            fs->f->linedefined, limit, what);
  luaX_lexerror(fs->ls, msg, 0);
}


static int testnext (LexState *ls, int c) {
  if (ls->t.token == c) {
    luaX_next(ls);
    return 1;
  }
  else return 0;
}


static void check (LexState *ls, int c) {
  if (ls->t.token != c)
    error_expected(ls, c);
}

static void checknext (LexState *ls, int c) {
  check(ls, c);
  luaX_next(ls);
}


#define check_condition(ls,c,msg)	{ if (!(c)) luaX_syntaxerror(ls, msg); }



static void check_match (LexState *ls, int what, int who, int where) {
  if (!testnext(ls, what)) {
    if (where == ls->linenumber)
      error_expected(ls, what);
    else {
      luaX_syntaxerror(ls, luaO_pushfstring(ls->L,
             LUA_QS " expected (to close " LUA_QS " at line %d)",
              luaX_token2str(ls, what), luaX_token2str(ls, who), where));
    }
  }
}


static TString *str_checkname (LexState *ls) {
  TString *ts;
  check(ls, TK_NAME);
  ts = ls->t.seminfo.ts;
  luaX_next(ls);
  return ts;
}


static void init_exp (expdesc *e, expkind k, int i) {
  e->f = e->t = NO_JUMP;
  e->k = k;
  e->u.s.info = i;
}


static void codestring (LexState *ls, expdesc *e, TString *s) {
  init_exp(e, VK, luaK_stringK(ls->fs, s));
}


static void checkname(LexState *ls, expdesc *e) {
  codestring(ls, e, str_checkname(ls));
}


static int registerlocalvar (LexState *ls, TString *varname) {
  FuncState *fs = ls->fs;
  Proto *f = fs->f;
  int oldsize = f->sizelocvars;
  luaM_growvector(ls->L, f->locvars, fs->nlocvars, f->sizelocvars,
                  LocVar, SHRT_MAX, "too many local variables");
  while (oldsize < f->sizelocvars) f->locvars[oldsize++].varname = NULL;
  f->locvars[fs->nlocvars].varname = varname;
  luaC_objbarrier(ls->L, f, varname);
  return fs->nlocvars++;
}


#define new_localvarliteral(ls,v,n) \
  new_localvar(ls, luaX_newstring(ls, "" v, (sizeof(v)/sizeof(char))-1), n)


static void new_localvar (LexState *ls, TString *name, int n) {
  FuncState *fs = ls->fs;
  luaY_checklimit(fs, fs->nactvar+n+1, LUAI_MAXVARS, "local variables");
  fs->actvar[fs->nactvar+n] = cast(unsigned short, registerlocalvar(ls, name));
}


static void adjustlocalvars (LexState *ls, int nvars) {
  FuncState *fs = ls->fs;
  fs->nactvar = cast_byte(fs->nactvar + nvars);
  for (; nvars; nvars--) {
    getlocvar(fs, fs->nactvar - nvars).startpc = fs->pc;
  }
}


static void removevars (LexState *ls, int tolevel) {
  FuncState *fs = ls->fs;
  while (fs->nactvar > tolevel)
    getlocvar(fs, --fs->nactvar).endpc = fs->pc;
}


static int indexupvalue (FuncState *fs, TString *name, expdesc *v) {
  int i;
  Proto *f = fs->f;
  int oldsize = f->sizeupvalues;
  for (i=0; i<f->nups; i++) {
    if (fs->upvalues[i].k == v->k && fs->upvalues[i].info == v->u.s.info) {
      lua_assert(f->upvalues[i] == name);
      return i;
    }
  }
  /* new one */
  luaY_checklimit(fs, f->nups + 1, LUAI_MAXUPVALUES, "upvalues");
  luaM_growvector(fs->L, f->upvalues, f->nups, f->sizeupvalues,
                  TString *, MAX_INT, "");
  while (oldsize < f->sizeupvalues) f->upvalues[oldsize++] = NULL;
  f->upvalues[f->nups] = name;
  luaC_objbarrier(fs->L, f, name);
  lua_assert(v->k == VLOCAL || v->k == VUPVAL);
  fs->upvalues[f->nups].k = cast_byte(v->k);
  fs->upvalues[f->nups].info = cast_byte(v->u.s.info);
  return f->nups++;
}


static int searchvar (FuncState *fs, TString *n) {
  int i;
  for (i=fs->nactvar-1; i >= 0; i--) {
    if (n == getlocvar(fs, i).varname)
      return i;
  }
  return -1;  /* not found */
}


static void markupval (FuncState *fs, int level) {
  BlockCnt *bl = fs->bl;
  while (bl && bl->nactvar > level) bl = bl->previous;
  if (bl) bl->upval = 1;
}


static int singlevaraux (FuncState *fs, TString *n, expdesc *var, int base) {
  if (fs == NULL) {  /* no more levels? */
    init_exp(var, VGLOBAL, NO_REG);  /* default is global variable */
    return VGLOBAL;
  }
  else {
    int v = searchvar(fs, n);  /* look up at current level */
    if (v >= 0) {
      init_exp(var, VLOCAL, v);
      if (!base)
        markupval(fs, v);  /* local will be used as an upval */
      return VLOCAL;
    }
    else {  /* not found at current level; try upper one */
      if (singlevaraux(fs->prev, n, var, 0) == VGLOBAL)
        return VGLOBAL;
      var->u.s.info = indexupvalue(fs, n, var);  /* else was LOCAL or UPVAL */
      var->k = VUPVAL;  /* upvalue in this level */
      return VUPVAL;
    }
  }
}


static void singlevar (LexState *ls, expdesc *var) {
  TString *varname = str_checkname(ls);
  FuncState *fs = ls->fs;
  if (singlevaraux(fs, varname, var, 1) == VGLOBAL)
    var->u.s.info = luaK_stringK(fs, varname);  /* info points to global name */
}


static void adjust_assign (LexState *ls, int nvars, int nexps, expdesc *e) {
  FuncState *fs = ls->fs;
  int extra = nvars - nexps;
  if (hasmultret(e->k)) {
    extra++;  /* includes call itself */
    if (extra < 0) extra = 0;
    luaK_setreturns(fs, e, extra);  /* last exp. provides the difference */
    if (extra > 1) luaK_reserveregs(fs, extra-1);
  }
  else {
    if (e->k != VVOID) luaK_exp2nextreg(fs, e);  /* close last expression */
    if (extra > 0) {
      int reg = fs->freereg;
      luaK_reserveregs(fs, extra);
      luaK_nil(fs, reg, extra);
    }
  }
}


static void enterlevel (LexState *ls) {
  if (++ls->L->nCcalls > LUAI_MAXCCALLS)
	luaX_lexerror(ls, "chunk has too many syntax levels", 0);
}


#define leavelevel(ls)	((ls)->L->nCcalls--)


static void enterblock (FuncState *fs, BlockCnt *bl, lu_byte isbreakable) {
  bl->breaklist = NO_JUMP;
  bl->isbreakable = isbreakable;
  bl->nactvar = fs->nactvar;
  bl->upval = 0;
  bl->previous = fs->bl;
  fs->bl = bl;
  lua_assert(fs->freereg == fs->nactvar);
}


static void leaveblock (FuncState *fs) {
  BlockCnt *bl = fs->bl;
  fs->bl = bl->previous;
  removevars(fs->ls, bl->nactvar);
  if (bl->upval)
    luaK_codeABC(fs, OP_CLOSE, bl->nactvar, 0, 0);
  /* a block either controls scope or breaks (never both) */
  lua_assert(!bl->isbreakable || !bl->upval);
  lua_assert(bl->nactvar == fs->nactvar);
  fs->freereg = fs->nactvar;  /* free registers */
  luaK_patchtohere(fs, bl->breaklist);
}


static void pushclosure (LexState *ls, FuncState *func, expdesc *v) {
  FuncState *fs = ls->fs;
  Proto *f = fs->f;
  int oldsize = f->sizep;
  int i;
  luaM_growvector(ls->L, f->p, fs->np, f->sizep, Proto *,
                  MAXARG_Bx, "constant table overflow");
  while (oldsize < f->sizep) f->p[oldsize++] = NULL;
  f->p[fs->np++] = func->f;
  luaC_objbarrier(ls->L, f, func->f);
  init_exp(v, VRELOCABLE, luaK_codeABx(fs, OP_CLOSURE, 0, fs->np-1));
  for (i=0; i<func->f->nups; i++) {
    OpCode o = (func->upvalues[i].k == VLOCAL) ? OP_MOVE : OP_GETUPVAL;
    luaK_codeABC(fs, o, 0, func->upvalues[i].info, 0);
  }
}


static void open_func (LexState *ls, FuncState *fs) {
  lua_State *L = ls->L;
  Proto *f = luaF_newproto(L);
  fs->f = f;
  fs->prev = ls->fs;  /* linked list of funcstates */
  fs->ls = ls;
  fs->L = L;
  ls->fs = fs;
  fs->pc = 0;
  fs->lasttarget = -1;
  fs->jpc = NO_JUMP;
  fs->freereg = 0;
  fs->nk = 0;
  fs->np = 0;
  fs->nlocvars = 0;
  fs->nactvar = 0;
  fs->bl = NULL;
  f->source = ls->source;
  f->maxstacksize = 2;  /* registers 0/1 are always valid */
  fs->h = luaH_new(L, 0, 0);
  /* anchor table of constants and prototype (to avoid being collected) */
  sethvalue2s(L, L->top, fs->h);
  incr_top(L);
  setptvalue2s(L, L->top, f);
  incr_top(L);
}


static void close_func (LexState *ls) {
  lua_State *L = ls->L;
  FuncState *fs = ls->fs;
  Proto *f = fs->f;
  removevars(ls, 0);
  luaK_ret(fs, 0, 0);  /* final return */
  luaM_reallocvector(L, f->code, f->sizecode, fs->pc, Instruction);
  f->sizecode = fs->pc;
  luaM_reallocvector(L, f->lineinfo, f->sizelineinfo, fs->pc, int);
  f->sizelineinfo = fs->pc;
  luaM_reallocvector(L, f->k, f->sizek, fs->nk, TValue);
  f->sizek = fs->nk;
  luaM_reallocvector(L, f->p, f->sizep, fs->np, Proto *);
  f->sizep = fs->np;
  luaM_reallocvector(L, f->locvars, f->sizelocvars, fs->nlocvars, LocVar);
  f->sizelocvars = fs->nlocvars;
  luaM_reallocvector(L, f->upvalues, f->sizeupvalues, f->nups, TString *);
  f->sizeupvalues = f->nups;
  lua_assert(luaG_checkcode(f));
  lua_assert(fs->bl == NULL);
  ls->fs = fs->prev;
  L->top -= 2;  /* remove table and prototype from the stack */
  /* last token read was anchored in defunct function; must reanchor it */
  if (fs) anchor_token(ls);
}


Proto *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff, const char *name) {
  struct LexState lexstate;
  struct FuncState funcstate;
  lexstate.buff = buff;
  luaX_setinput(L, &lexstate, z, luaS_new(L, name));
  open_func(&lexstate, &funcstate);
  funcstate.f->is_vararg = VARARG_ISVARARG;  /* main func. is always vararg */
  luaX_next(&lexstate);  /* read first token */
  chunk(&lexstate);
  check(&lexstate, TK_EOS);
  close_func(&lexstate);
  lua_assert(funcstate.prev == NULL);
  lua_assert(funcstate.f->nups == 0);
  lua_assert(lexstate.fs == NULL);
  return funcstate.f;
}



/*============================================================*/
/* GRAMMAR RULES */
/*============================================================*/


static void field (LexState *ls, expdesc *v) {
  /* field -> ['.' | ':'] NAME */
  FuncState *fs = ls->fs;
  expdesc key;
  luaK_exp2anyreg(fs, v);
  luaX_next(ls);  /* skip the dot or colon */
  checkname(ls, &key);
  luaK_indexed(fs, v, &key);
}


static void yindex (LexState *ls, expdesc *v) {
  /* index -> '[' expr ']' */
  luaX_next(ls);  /* skip the '[' */
  expr(ls, v);
  luaK_exp2val(ls->fs, v);
  checknext(ls, ']');
}


/*
** {======================================================================
** Rules for Constructors
** =======================================================================
*/


struct ConsControl {
  expdesc v;  /* last list item read */
  expdesc *t;  /* table descriptor */
  int nh;  /* total number of `record' elements */
  int na;  /* total number of array elements */
  int tostore;  /* number of array elements pending to be stored */
};


static void recfield (LexState *ls, struct ConsControl *cc) {
  /* recfield -> (NAME | `['exp1`]') = exp1 */
  FuncState *fs = ls->fs;
  int reg = ls->fs->freereg;
  expdesc key, val;
  int rkkey;
  if (ls->t.token == TK_NAME) {
    luaY_checklimit(fs, cc->nh, MAX_INT, "items in a constructor");
    checkname(ls, &key);
  }
  else  /* ls->t.token == '[' */
    yindex(ls, &key);
  cc->nh++;
  checknext(ls, '=');
  rkkey = luaK_exp2RK(fs, &key);
  expr(ls, &val);
  luaK_codeABC(fs, OP_SETTABLE, cc->t->u.s.info, rkkey, luaK_exp2RK(fs, &val));
  fs->freereg = reg;  /* free registers */
}


static void closelistfield (FuncState *fs, struct ConsControl *cc) {
  if (cc->v.k == VVOID) return;  /* there is no list item */
  luaK_exp2nextreg(fs, &cc->v);
  cc->v.k = VVOID;
  if (cc->tostore == LFIELDS_PER_FLUSH) {
    luaK_setlist(fs, cc->t->u.s.info, cc->na, cc->tostore);  /* flush */
    cc->tostore = 0;  /* no more items pending */
  }
}


static void lastlistfield (FuncState *fs, struct ConsControl *cc) {
  if (cc->tostore == 0) return;
  if (hasmultret(cc->v.k)) {
    luaK_setmultret(fs, &cc->v);
    luaK_setlist(fs, cc->t->u.s.info, cc->na, LUA_MULTRET);
    cc->na--;  /* do not count last expression (unknown number of elements) */
  }
  else {
    if (cc->v.k != VVOID)
      luaK_exp2nextreg(fs, &cc->v);
    luaK_setlist(fs, cc->t->u.s.info, cc->na, cc->tostore);
  }
}


static void listfield (LexState *ls, struct ConsControl *cc) {
  expr(ls, &cc->v);
  luaY_checklimit(ls->fs, cc->na, MAX_INT, "items in a constructor");
  cc->na++;
  cc->tostore++;
}


static void constructor (LexState *ls, expdesc *t) {
  /* constructor -> ?? */
  FuncState *fs = ls->fs;
  int line = ls->linenumber;
  int pc = luaK_codeABC(fs, OP_NEWTABLE, 0, 0, 0);
  struct ConsControl cc;
  cc.na = cc.nh = cc.tostore = 0;
  cc.t = t;
  init_exp(t, VRELOCABLE, pc);
  init_exp(&cc.v, VVOID, 0);  /* no value (yet) */
  luaK_exp2nextreg(ls->fs, t);  /* fix it at stack top (for gc) */
  checknext(ls, '{');
  do {
    lua_assert(cc.v.k == VVOID || cc.tostore > 0);
    if (ls->t.token == '}') break;
    closelistfield(fs, &cc);
    switch(ls->t.token) {
      case TK_NAME: {  /* may be listfields or recfields */
        luaX_lookahead(ls);
        if (ls->lookahead.token != '=')  /* expression? */
          listfield(ls, &cc);
        else
          recfield(ls, &cc);
        break;
      }
      case '[': {  /* constructor_item -> recfield */
        recfield(ls, &cc);
        break;
      }
      default: {  /* constructor_part -> listfield */
        listfield(ls, &cc);
        break;
      }
    }
  } while (testnext(ls, ',') || testnext(ls, ';'));
  check_match(ls, '}', '{', line);
  lastlistfield(fs, &cc);
  SETARG_B(fs->f->code[pc], luaO_int2fb(cc.na)); /* set initial array size */
  SETARG_C(fs->f->code[pc], luaO_int2fb(cc.nh));  /* set initial table size */
}

/* }====================================================================== */



static void parlist (LexState *ls) {
  /* parlist -> [ param { `,' param } ] */
  FuncState *fs = ls->fs;
  Proto *f = fs->f;
  int nparams = 0;
  f->is_vararg = 0;
  if (ls->t.token != ')') {  /* is `parlist' not empty? */
    do {
      switch (ls->t.token) {
        case TK_NAME: {  /* param -> NAME */
          new_localvar(ls, str_checkname(ls), nparams++);
          break;
        }
        case TK_DOTS: {  /* param -> `...' */
          luaX_next(ls);
#if defined(LUA_COMPAT_VARARG)
          /* use `arg' as default name */
          new_localvarliteral(ls, "arg", nparams++);
          f->is_vararg = VARARG_HASARG | VARARG_NEEDSARG;
#endif
          f->is_vararg |= VARARG_ISVARARG;
          break;
        }
        default: luaX_syntaxerror(ls, "<name> or " LUA_QL("...") " expected");
      }
    } while (!f->is_vararg && testnext(ls, ','));
  }
  adjustlocalvars(ls, nparams);
  f->numparams = cast_byte(fs->nactvar - (f->is_vararg & VARARG_HASARG));
  luaK_reserveregs(fs, fs->nactvar);  /* reserve register for parameters */
}


static void body (LexState *ls, expdesc *e, int needself, int line) {
  /* body ->  `(' parlist `)' chunk END */
  FuncState new_fs;
  open_func(ls, &new_fs);
  new_fs.f->linedefined = line;
  checknext(ls, '(');
  if (needself) {
    new_localvarliteral(ls, "self", 0);
    adjustlocalvars(ls, 1);
  }
  parlist(ls);
  checknext(ls, ')');
  chunk(ls);
  new_fs.f->lastlinedefined = ls->linenumber;
  check_match(ls, TK_END, TK_FUNCTION, line);
  close_func(ls);
  pushclosure(ls, &new_fs, e);
}


static int explist1 (LexState *ls, expdesc *v) {
  /* explist1 -> expr { `,' expr } */
  int n = 1;  /* at least one expression */
  expr(ls, v);
  while (testnext(ls, ',')) {
    luaK_exp2nextreg(ls->fs, v);
    expr(ls, v);
    n++;
  }
  return n;
}


static void funcargs (LexState *ls, expdesc *f) {
  FuncState *fs = ls->fs;
  expdesc args;
  int base, nparams;
  int line = ls->linenumber;
  switch (ls->t.token) {
    case '(': {  /* funcargs -> `(' [ explist1 ] `)' */
      if (line != ls->lastline)
        luaX_syntaxerror(ls,"ambiguous syntax (function call x new statement)");
      luaX_next(ls);
      if (ls->t.token == ')')  /* arg list is empty? */
        args.k = VVOID;
      else {
        explist1(ls, &args);
        luaK_setmultret(fs, &args);
      }
      check_match(ls, ')', '(', line);
      break;
    }
    case '{': {  /* funcargs -> constructor */
      constructor(ls, &args);
      break;
    }
    case TK_STRING: {  /* funcargs -> STRING */
      codestring(ls, &args, ls->t.seminfo.ts);
      luaX_next(ls);  /* must use `seminfo' before `next' */
      break;
    }
    default: {
      luaX_syntaxerror(ls, "function arguments expected");
      return;
    }
  }
  lua_assert(f->k == VNONRELOC);
  base = f->u.s.info;  /* base register for call */
  if (hasmultret(args.k))
    nparams = LUA_MULTRET;  /* open call */
  else {
    if (args.k != VVOID)
      luaK_exp2nextreg(fs, &args);  /* close last argument */
    nparams = fs->freereg - (base+1);
  }
  init_exp(f, VCALL, luaK_codeABC(fs, OP_CALL, base, nparams+1, 2));
  luaK_fixline(fs, line);
  fs->freereg = base+1;  /* call remove function and arguments and leaves
                            (unless changed) one result */
}




/*
** {======================================================================
** Expression parsing
** =======================================================================
*/


static void prefixexp (LexState *ls, expdesc *v) {
  /* prefixexp -> NAME | '(' expr ')' */
  switch (ls->t.token) {
    case '(': {
      int line = ls->linenumber;
      luaX_next(ls);
      expr(ls, v);
      check_match(ls, ')', '(', line);
      luaK_dischargevars(ls->fs, v);
      return;
    }
    case TK_NAME: {
      singlevar(ls, v);
      return;
    }
    default: {
      luaX_syntaxerror(ls, "unexpected symbol");
      return;
    }
  }
}


static void primaryexp (LexState *ls, expdesc *v) {
  /* primaryexp ->
        prefixexp { `.' NAME | `[' exp `]' | `:' NAME funcargs | funcargs } */
  FuncState *fs = ls->fs;
  prefixexp(ls, v);
  for (;;) {
    switch (ls->t.token) {
      case '.': {  /* field */
        field(ls, v);
        break;
      }
      case '[': {  /* `[' exp1 `]' */
        expdesc key;
        luaK_exp2anyreg(fs, v);
        yindex(ls, &key);
        luaK_indexed(fs, v, &key);
        break;
      }
      case ':': {  /* `:' NAME funcargs */
        expdesc key;
        luaX_next(ls);
        checkname(ls, &key);
        luaK_self(fs, v, &key);
        funcargs(ls, v);
        break;
      }
      case '(': case TK_STRING: case '{': {  /* funcargs */
        luaK_exp2nextreg(fs, v);
        funcargs(ls, v);
        break;
      }
      default: return;
    }
  }
}


static void simpleexp (LexState *ls, expdesc *v) {
  /* simpleexp -> NUMBER | STRING | NIL | true | false | ... |
                  constructor | FUNCTION body | primaryexp */
  switch (ls->t.token) {
    case TK_NUMBER: {
      init_exp(v, VKNUM, 0);
      v->u.nval = ls->t.seminfo.r;
      break;
    }
    case TK_STRING: {