lparser.c File Reference

#include <string.h>
#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"

Go to the source code of this file.

Data Structures
struct	BlockCnt
struct	ConsControl
struct	LHS_assign

Macros
#define	lparser_c
#define	LUA_CORE
#define	MAXVARS   200
#define	hasmultret(k)   ((k) == VCALL || (k) == VVARARG)
#define	check_condition(ls, c, msg)   { if (!(c)) luaX_syntaxerror(ls, msg); }
#define	new_localvarliteral(ls, v)    new_localvarliteral_(ls, "" v, (sizeof(v)/sizeof(char))-1)
#define	leavelevel(ls)   ((ls)->L->nCcalls--)
#define	UNARY_PRIORITY   8 /* priority for unary operators */

Typedefs
typedef struct BlockCnt	BlockCnt

Functions
static void	statement (LexState *ls)
static void	expr (LexState *ls, expdesc *v)
static void	anchor_token (LexState *ls)
static l_noret	semerror (LexState *ls, const char *msg)
static l_noret	error_expected (LexState *ls, int token)
static l_noret	errorlimit (FuncState *fs, int limit, const char *what)
static void	checklimit (FuncState *fs, int v, int l, const char *what)
static int	testnext (LexState *ls, int c)
static void	check (LexState *ls, int c)
static void	checknext (LexState *ls, int c)
static void	check_match (LexState *ls, int what, int who, int where)
static TString *	str_checkname (LexState *ls)
static void	init_exp (expdesc *e, expkind k, int i)
static void	codestring (LexState *ls, expdesc *e, TString *s)
static void	checkname (LexState *ls, expdesc *e)
static int	registerlocalvar (LexState *ls, TString *varname)
static void	new_localvar (LexState *ls, TString *name)
static void	new_localvarliteral_ (LexState *ls, const char *name, size_t sz)
static LocVar *	getlocvar (FuncState *fs, int i)
static void	adjustlocalvars (LexState *ls, int nvars)
static void	removevars (FuncState *fs, int tolevel)
static int	searchupvalue (FuncState *fs, TString *name)
static int	newupvalue (FuncState *fs, TString *name, expdesc *v)
static int	searchvar (FuncState *fs, TString *n)
static void	markupval (FuncState *fs, int level)
static int	singlevaraux (FuncState *fs, TString *n, expdesc *var, int base)
static void	singlevar (LexState *ls, expdesc *var)
static void	adjust_assign (LexState *ls, int nvars, int nexps, expdesc *e)
static void	enterlevel (LexState *ls)
static void	closegoto (LexState *ls, int g, Labeldesc *label)
static int	findlabel (LexState *ls, int g)
static int	newlabelentry (LexState *ls, Labellist *l, TString *name, int line, int pc)
static void	findgotos (LexState *ls, Labeldesc *lb)
static void	movegotosout (FuncState *fs, BlockCnt *bl)
static void	enterblock (FuncState *fs, BlockCnt *bl, lu_byte isloop)
static void	breaklabel (LexState *ls)
static l_noret	undefgoto (LexState *ls, Labeldesc *gt)
static void	leaveblock (FuncState *fs)
static Proto *	addprototype (LexState *ls)
static void	codeclosure (LexState *ls, expdesc *v)
static void	open_func (LexState *ls, FuncState *fs, BlockCnt *bl)
static void	close_func (LexState *ls)
static int	block_follow (LexState *ls, int withuntil)
static void	statlist (LexState *ls)
static void	fieldsel (LexState *ls, expdesc *v)
static void	yindex (LexState *ls, expdesc *v)
static void	recfield (LexState *ls, struct ConsControl *cc)
static void	closelistfield (FuncState *fs, struct ConsControl *cc)
static void	lastlistfield (FuncState *fs, struct ConsControl *cc)
static void	listfield (LexState *ls, struct ConsControl *cc)
static void	field (LexState *ls, struct ConsControl *cc)
static void	constructor (LexState *ls, expdesc *t)
static void	parlist (LexState *ls)
static void	body (LexState *ls, expdesc *e, int ismethod, int line)
static int	explist (LexState *ls, expdesc *v)
static void	funcargs (LexState *ls, expdesc *f, int line)
static void	primaryexp (LexState *ls, expdesc *v)
static void	suffixedexp (LexState *ls, expdesc *v)
static void	simpleexp (LexState *ls, expdesc *v)
static UnOpr	getunopr (int op)
static BinOpr	getbinopr (int op)
static BinOpr	subexpr (LexState *ls, expdesc *v, int limit)
static void	block (LexState *ls)
static void	check_conflict (LexState *ls, struct LHS_assign *lh, expdesc *v)
static void	assignment (LexState *ls, struct LHS_assign *lh, int nvars)
static int	cond (LexState *ls)
static void	gotostat (LexState *ls, int pc)
static void	checkrepeated (FuncState *fs, Labellist *ll, TString *label)
static void	skipnoopstat (LexState *ls)
static void	labelstat (LexState *ls, TString *label, int line)
static void	whilestat (LexState *ls, int line)
static void	repeatstat (LexState *ls, int line)
static int	exp1 (LexState *ls)
static void	forbody (LexState *ls, int base, int line, int nvars, int isnum)
static void	fornum (LexState *ls, TString *varname, int line)
static void	forlist (LexState *ls, TString *indexname)
static void	forstat (LexState *ls, int line)
static void	test_then_block (LexState *ls, int *escapelist)
static void	ifstat (LexState *ls, int line)
static void	localfunc (LexState *ls)
static void	localstat (LexState *ls)
static int	funcname (LexState *ls, expdesc *v)
static void	funcstat (LexState *ls, int line)
static void	exprstat (LexState *ls)
static void	retstat (LexState *ls)
static void	mainfunc (LexState *ls, FuncState *fs)
Closure *	luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff, Dyndata *dyd, const char *name, int firstchar)

Variables
struct {
lu_byte   left
lu_byte   right
}	priority []

Macro Definition Documentation

check_condition

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

Definition at line 122 of file lua-5.2.4/src/lparser.c.

Referenced by assignment(), exprstat(), and simpleexp().

hasmultret

#define hasmultret

(

k

)

((k) == VCALL || (k) == VVARARG)

Definition at line 35 of file lua-5.2.4/src/lparser.c.

Referenced by adjust_assign(), funcargs(), lastlistfield(), and retstat().

leavelevel

#define leavelevel

(

ls

)

((ls)->L->nCcalls--)

Definition at line 337 of file lua-5.2.4/src/lparser.c.

Referenced by statement(), and subexpr().

lparser_c

#define lparser_c

Definition at line 10 of file lua-5.2.4/src/lparser.c.

LUA_CORE

#define LUA_CORE

Definition at line 11 of file lua-5.2.4/src/lparser.c.

MAXVARS

#define MAXVARS   200

Definition at line 32 of file lua-5.2.4/src/lparser.c.

Referenced by new_localvar().

new_localvarliteral

#define new_localvarliteral	(		ls,
			v )    new_localvarliteral_(ls, "" v, (sizeof(v)/sizeof(char))-1)

Definition at line 194 of file lua-5.2.4/src/lparser.c.

#define new_localvarliteral(ls,v) \
    new_localvarliteral_(ls, "" v, (sizeof(v)/sizeof(char))-1)

Referenced by body(), forlist(), and fornum().

UNARY_PRIORITY

#define UNARY_PRIORITY   8 /* priority for unary operators */

Definition at line 1030 of file lua-5.2.4/src/lparser.c.

Referenced by subexpr().

Typedef Documentation

BlockCnt

typedef struct BlockCnt BlockCnt

Function Documentation

addprototype()

static Proto * addprototype ( LexState * ls )

static

Definition at line 498 of file lua-5.2.4/src/lparser.c.

                                          {
  Proto *clp;
  lua_State *L = ls->L;
  FuncState *fs = ls->fs;
  Proto *f = fs->f;  /* prototype of current function */
  if (fs->np >= f->sizep) {
    int oldsize = f->sizep;
    luaM_growvector(L, f->p, fs->np, f->sizep, Proto *, MAXARG_Bx, "functions");
    while (oldsize < f->sizep) f->p[oldsize++] = NULL;
  }
  f->p[fs->np++] = clp = luaF_newproto(L);
  luaC_objbarrier(L, f, clp);
  return clp;
}

References FuncState::f, LexState::fs, LexState::L, luaC_objbarrier, luaF_newproto(), luaM_growvector, MAXARG_Bx, FuncState::np, NULL, Proto::p, and Proto::sizep.

Referenced by body().

adjust_assign()

static void adjust_assign ( LexState * ls, int nvars, int nexps, expdesc * e )

static

Definition at line 310 of file lua-5.2.4/src/lparser.c.

                                                                           {
  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);
    }
  }
}

References FuncState::freereg, LexState::fs, hasmultret, expdesc::k, luaK_exp2nextreg(), luaK_nil(), luaK_reserveregs(), luaK_setreturns(), and VVOID.

Referenced by assignment(), forlist(), and localstat().

adjustlocalvars()

static void adjustlocalvars ( LexState * ls, int nvars )

static

Definition at line 205 of file lua-5.2.4/src/lparser.c.

                                                      {
  FuncState *fs = ls->fs;
  fs->nactvar = cast_byte(fs->nactvar + nvars);
  for (; nvars; nvars--) {
    getlocvar(fs, fs->nactvar - nvars)->startpc = fs->pc;
  }
}

References cast_byte, LexState::fs, getlocvar, FuncState::nactvar, and FuncState::pc.

Referenced by body(), forbody(), localfunc(), localstat(), and parlist().

anchor_token()

static void anchor_token ( LexState * ls )

static

Definition at line 60 of file lua-5.2.4/src/lparser.c.

                                        {
  /* last token from outer function must be EOS */
  lua_assert(ls->fs != NULL || ls->t.token == TK_EOS);
  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);
  }
}

References LexState::fs, getstr, TString::len, lua_assert, luaX_newstring(), NULL, Token::seminfo, LexState::t, TK_EOS, TK_NAME, TK_STRING, Token::token, SemInfo::ts, and TString::tsv.

Referenced by close_func().

assignment()

static void assignment ( LexState * ls, struct LHS_assign * lh, int nvars )

static

Definition at line 1136 of file lua-5.2.4/src/lparser.c.

                                                                        {
  expdesc e;
  check_condition(ls, vkisvar(lh->v.k), "syntax error");
  if (testnext(ls, ',')) {  /* assignment -> ',' suffixedexp assignment */
    struct LHS_assign nv;
    nv.prev = lh;
    suffixedexp(ls, &nv.v);
    if (nv.v.k != VINDEXED)
      check_conflict(ls, lh, &nv.v);
    checklimit(ls->fs, nvars + ls->L->nCcalls, LUAI_MAXCCALLS,
                    "C levels");
    assignment(ls, &nv, nvars+1);
  }
  else {  /* assignment -> `=' explist */
    int nexps;
    checknext(ls, '=');
    nexps = explist(ls, &e);
    if (nexps != nvars) {
      adjust_assign(ls, nvars, nexps, &e);
      if (nexps > nvars)
        ls->fs->freereg -= nexps - nvars;  /* remove extra values */
    }
    else {
      luaK_setoneret(ls->fs, &e);  /* close last expression */
      luaK_storevar(ls->fs, &lh->v, &e);
      return;  /* avoid default */
    }
  }
  init_exp(&e, VNONRELOC, ls->fs->freereg-1);  /* default assignment */
  luaK_storevar(ls->fs, &lh->v, &e);
}

References adjust_assign(), assignment(), check_condition, check_conflict(), checklimit(), checknext(), explist(), FuncState::freereg, LexState::fs, init_exp(), expdesc::k, LexState::L, LUAI_MAXCCALLS, luaK_setoneret(), luaK_storevar(), lua_State::nCcalls, LHS_assign::prev, suffixedexp(), testnext(), LHS_assign::v, VINDEXED, vkisvar, and VNONRELOC.

Referenced by assignment(), and exprstat().

block()

static void block ( LexState * ls )

static

Definition at line 1082 of file lua-5.2.4/src/lparser.c.

                                 {
  /* block -> statlist */
  FuncState *fs = ls->fs;
  BlockCnt bl;
  enterblock(fs, &bl, 0);
  statlist(ls);
  leaveblock(fs);
}

References enterblock(), LexState::fs, leaveblock(), and statlist().

Referenced by forbody(), ifstat(), statement(), and whilestat().

block_follow()

static int block_follow ( LexState * ls, int withuntil )

static

Definition at line 593 of file lua-5.2.4/src/lparser.c.

                                                      {
  switch (ls->t.token) {
    case TK_ELSE: case TK_ELSEIF:
    case TK_END: case TK_EOS:
      return 1;
    case TK_UNTIL: return withuntil;
    default: return 0;
  }
}

References LexState::t, TK_ELSE, TK_ELSEIF, TK_END, TK_EOS, TK_UNTIL, and Token::token.

Referenced by labelstat(), retstat(), statlist(), and test_then_block().

body()

static void body ( LexState * ls, expdesc * e, int ismethod, int line )

static

Definition at line 788 of file lua-5.2.4/src/lparser.c.

                                                                    {
  /* body ->  `(' parlist `)' block END */
  FuncState new_fs;
  BlockCnt bl;
  new_fs.f = addprototype(ls);
  new_fs.f->linedefined = line;
  open_func(ls, &new_fs, &bl);
  checknext(ls, '(');
  if (ismethod) {
    new_localvarliteral(ls, "self");  /* create 'self' parameter */
    adjustlocalvars(ls, 1);
  }
  parlist(ls);
  checknext(ls, ')');
  statlist(ls);
  new_fs.f->lastlinedefined = ls->linenumber;
  check_match(ls, TK_END, TK_FUNCTION, line);
  codeclosure(ls, e);
  close_func(ls);
}

References addprototype(), adjustlocalvars(), check_match(), checknext(), close_func(), codeclosure(), FuncState::f, Proto::lastlinedefined, Proto::linedefined, LexState::linenumber, new_localvarliteral, open_func(), parlist(), statlist(), TK_END, and TK_FUNCTION.

Referenced by funcstat(), localfunc(), and simpleexp().

breaklabel()

static void breaklabel ( LexState * ls )

static

Definition at line 453 of file lua-5.2.4/src/lparser.c.

                                      {
  TString *n = luaS_new(ls->L, "break");
  int l = newlabelentry(ls, &ls->dyd->label, n, 0, ls->fs->pc);
  findgotos(ls, &ls->dyd->label.arr[l]);
}

References Labellist::arr, LexState::dyd, findgotos(), LexState::fs, LexState::L, Dyndata::label, luaS_new, newlabelentry(), and FuncState::pc.

Referenced by leaveblock().

check()

static void check ( LexState * ls, int c )

static

Definition at line 110 of file lua-5.2.4/src/lparser.c.

                                        {
  if (ls->t.token != c)
    error_expected(ls, c);
}

References error_expected(), LexState::t, and Token::token.

check_conflict()

static void check_conflict ( LexState * ls, struct LHS_assign * lh, expdesc * v )

static

Definition at line 1108 of file lua-5.2.4/src/lparser.c.

                                                                             {
  FuncState *fs = ls->fs;
  int extra = fs->freereg;  /* eventual position to save local variable */
  int conflict = 0;
  for (; lh; lh = lh->prev) {  /* check all previous assignments */
    if (lh->v.k == VINDEXED) {  /* assigning to a table? */
      /* table is the upvalue/local being assigned now? */
      if (lh->v.u.ind.vt == v->k && lh->v.u.ind.t == v->u.info) {
        conflict = 1;
        lh->v.u.ind.vt = VLOCAL;
        lh->v.u.ind.t = extra;  /* previous assignment will use safe copy */
      }
      /* index is the local being assigned? (index cannot be upvalue) */
      if (v->k == VLOCAL && lh->v.u.ind.idx == v->u.info) {
        conflict = 1;
        lh->v.u.ind.idx = extra;  /* previous assignment will use safe copy */
      }
    }
  }
  if (conflict) {
    /* copy upvalue/local value to a temporary (in position 'extra') */
    OpCode op = (v->k == VLOCAL) ? OP_MOVE : OP_GETUPVAL;
    luaK_codeABC(fs, op, extra, v->u.info, 0);
    luaK_reserveregs(fs, 1);
  }
}

References FuncState::freereg, LexState::fs, expdesc::idx, expdesc::ind, expdesc::info, expdesc::k, luaK_codeABC, luaK_reserveregs(), OP_GETUPVAL, OP_MOVE, LHS_assign::prev, expdesc::t, expdesc::u, LHS_assign::v, VINDEXED, VLOCAL, and expdesc::vt.

Referenced by assignment().

check_match()

static void check_match ( LexState * ls, int what, int who, int where )

static

Definition at line 126 of file lua-5.2.4/src/lparser.c.

                                                                     {
  if (!testnext(ls, what)) {
    if (where == ls->linenumber)
      error_expected(ls, what);
    else {
      luaX_syntaxerror(ls, luaO_pushfstring(ls->L,
             "%s expected (to close %s at line %d)",
              luaX_token2str(ls, what), luaX_token2str(ls, who), where));
    }
  }
}

References error_expected(), LexState::L, LexState::linenumber, luaO_pushfstring(), luaX_syntaxerror(), luaX_token2str(), and testnext().

Referenced by body(), constructor(), forstat(), funcargs(), ifstat(), primaryexp(), repeatstat(), statement(), and whilestat().

checklimit()

static void checklimit ( FuncState * fs, int v, int l, const char * what )

static

Definition at line 96 of file lua-5.2.4/src/lparser.c.

                                                                       {
  if (v > l) errorlimit(fs, l, what);
}

References errorlimit().

Referenced by assignment(), enterlevel(), listfield(), new_localvar(), newupvalue(), and recfield().

checkname()

static void checkname ( LexState * ls, expdesc * e )

static

Definition at line 160 of file lua-5.2.4/src/lparser.c.

                                                 {
  codestring(ls, e, str_checkname(ls));
}

References codestring(), and str_checkname().

Referenced by fieldsel(), recfield(), and suffixedexp().

checknext()

static void checknext ( LexState * ls, int c )

static

Definition at line 116 of file lua-5.2.4/src/lparser.c.

                                            {
  check(ls, c);
  luaX_next(ls);
}

References check, and luaX_next().

Referenced by assignment(), body(), constructor(), forbody(), forlist(), fornum(), labelstat(), recfield(), test_then_block(), whilestat(), and yindex().

checkrepeated()

static void checkrepeated ( FuncState * fs, Labellist * ll, TString * label )

static

Definition at line 1195 of file lua-5.2.4/src/lparser.c.

                                                                         {
  int i;
  for (i = fs->bl->firstlabel; i < ll->n; i++) {
    if (luaS_eqstr(label, ll->arr[i].name)) {
      const char *msg = luaO_pushfstring(fs->ls->L,
                          "label " LUA_QS " already defined on line %d",
                          getstr(label), ll->arr[i].line);
      semerror(fs->ls, msg);
    }
  }
}

References Labellist::arr, FuncState::bl, BlockCnt::firstlabel, getstr, LexState::L, Labeldesc::line, FuncState::ls, LUA_QS, luaO_pushfstring(), luaS_eqstr(), Labellist::n, Labeldesc::name, and semerror().

Referenced by labelstat().

close_func()

static void close_func ( LexState * ls )

static

Definition at line 555 of file lua-5.2.4/src/lparser.c.

                                      {
  lua_State *L = ls->L;
  FuncState *fs = ls->fs;
  Proto *f = fs->f;
  luaK_ret(fs, 0, 0);  /* final return */
  leaveblock(fs);
  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, fs->nups, Upvaldesc);
  f->sizeupvalues = fs->nups;
  lua_assert(fs->bl == NULL);
  ls->fs = fs->prev;
  /* last token read was anchored in defunct function; must re-anchor it */
  anchor_token(ls);
  L->top--;  /* pop table of constants */
  luaC_checkGC(L);
}

References anchor_token(), FuncState::bl, Proto::code, FuncState::f, LexState::fs, Proto::k, LexState::L, leaveblock(), Proto::lineinfo, Proto::locvars, lua_assert, luaC_checkGC, luaK_ret(), luaM_reallocvector, FuncState::nk, FuncState::nlocvars, FuncState::np, NULL, FuncState::nups, Proto::p, FuncState::pc, FuncState::prev, Proto::sizecode, Proto::sizek, Proto::sizelineinfo, Proto::sizelocvars, Proto::sizep, Proto::sizeupvalues, lua_State::top, and Proto::upvalues.

Referenced by body(), and mainfunc().

closegoto()

static void closegoto ( LexState * ls, int g, Labeldesc * label )

static

Definition at line 340 of file lua-5.2.4/src/lparser.c.

                                                              {
  int i;
  FuncState *fs = ls->fs;
  Labellist *gl = &ls->dyd->gt;
  Labeldesc *gt = &gl->arr[g];
  lua_assert(luaS_eqstr(gt->name, label->name));
  if (gt->nactvar < label->nactvar) {
    TString *vname = getlocvar(fs, gt->nactvar)->varname;
    const char *msg = luaO_pushfstring(ls->L,
      "<goto %s> at line %d jumps into the scope of local " LUA_QS,
      getstr(gt->name), gt->line, getstr(vname));
    semerror(ls, msg);
  }
  luaK_patchlist(fs, gt->pc, label->pc);
  /* remove goto from pending list */
  for (i = g; i < gl->n - 1; i++)
    gl->arr[i] = gl->arr[i + 1];
  gl->n--;
}

References Labellist::arr, LexState::dyd, LexState::fs, getlocvar, getstr, gt, Dyndata::gt, LexState::L, lua_assert, LUA_QS, luaK_patchlist(), luaO_pushfstring(), luaS_eqstr(), Labellist::n, FuncState::nactvar, Labeldesc::nactvar, Labeldesc::name, FuncState::pc, Labeldesc::pc, and semerror().

Referenced by findgotos(), and findlabel().

closelistfield()

static void closelistfield ( FuncState * fs, struct ConsControl * cc )

static

Definition at line 673 of file lua-5.2.4/src/lparser.c.

                                                                   {
  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.info, cc->na, cc->tostore);  /* flush */
    cc->tostore = 0;  /* no more items pending */
  }
}

References expdesc::info, expdesc::k, LFIELDS_PER_FLUSH, luaK_exp2nextreg(), luaK_setlist(), ConsControl::na, ConsControl::t, ConsControl::tostore, expdesc::u, ConsControl::v, and VVOID.

Referenced by constructor().

codeclosure()

static void codeclosure ( LexState * ls, expdesc * v )

static

Definition at line 520 of file lua-5.2.4/src/lparser.c.

                                                   {
  FuncState *fs = ls->fs->prev;
  init_exp(v, VRELOCABLE, luaK_codeABx(fs, OP_CLOSURE, 0, fs->np - 1));
  luaK_exp2nextreg(fs, v);  /* fix it at the last register */
}

References LexState::fs, init_exp(), luaK_codeABx(), luaK_exp2nextreg(), FuncState::np, OP_CLOSURE, FuncState::prev, and VRELOCABLE.

Referenced by body().

codestring()

static void codestring ( LexState * ls, expdesc * e, TString * s )

static

Definition at line 155 of file lua-5.2.4/src/lparser.c.

                                                              {
  init_exp(e, VK, luaK_stringK(ls->fs, s));
}

References LexState::fs, init_exp(), luaK_stringK(), s, and VK.

Referenced by checkname(), funcargs(), simpleexp(), and singlevar().

cond()

static int cond ( LexState * ls )

static

Definition at line 1169 of file lua-5.2.4/src/lparser.c.

                               {
  /* cond -> exp */
  expdesc v;
  expr(ls, &v);  /* read condition */
  if (v.k == VNIL) v.k = VFALSE;  /* `falses' are all equal here */
  luaK_goiftrue(ls->fs, &v);
  return v.f;
}

References expr(), expdesc::f, LexState::fs, expdesc::k, luaK_goiftrue(), LHS_assign::v, VFALSE, and VNIL.

Referenced by repeatstat(), and whilestat().

constructor()

static void constructor ( LexState * ls, expdesc * t )

static

Definition at line 730 of file lua-5.2.4/src/lparser.c.

                                                   {
  /* constructor -> '{' [ field { sep field } [sep] ] '}'
     sep -> ',' | ';' */
  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 */
  checknext(ls, '{');
  do {
    lua_assert(cc.v.k == VVOID || cc.tostore > 0);
    if (ls->t.token == '}') break;
    closelistfield(fs, &cc);
    field(ls, &cc);
  } 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 */
}

References check_match(), checknext(), closelistfield(), Proto::code, FuncState::f, field(), LexState::fs, init_exp(), expdesc::k, lastlistfield(), LexState::linenumber, lua_assert, luaK_codeABC, luaK_exp2nextreg(), luaO_int2fb(), ConsControl::na, ConsControl::nh, OP_NEWTABLE, SETARG_B, SETARG_C, LexState::t, ConsControl::t, testnext(), Token::token, ConsControl::tostore, ConsControl::v, VRELOCABLE, and VVOID.

Referenced by funcargs(), and simpleexp().

enterblock()

static void enterblock ( FuncState * fs, BlockCnt * bl, lu_byte isloop )

static

Definition at line 438 of file lua-5.2.4/src/lparser.c.

                                                                     {
  bl->isloop = isloop;
  bl->nactvar = fs->nactvar;
  bl->firstlabel = fs->ls->dyd->label.n;
  bl->firstgoto = fs->ls->dyd->gt.n;
  bl->upval = 0;
  bl->previous = fs->bl;
  fs->bl = bl;
  lua_assert(fs->freereg == fs->nactvar);
}

References FuncState::bl, LexState::dyd, BlockCnt::firstgoto, BlockCnt::firstlabel, FuncState::freereg, Dyndata::gt, BlockCnt::isloop, Dyndata::label, FuncState::ls, lua_assert, Labellist::n, BlockCnt::nactvar, FuncState::nactvar, BlockCnt::previous, and BlockCnt::upval.

Referenced by block(), forbody(), forstat(), open_func(), repeatstat(), test_then_block(), and whilestat().

enterlevel()

static void enterlevel ( LexState * ls )

static

Definition at line 330 of file lua-5.2.4/src/lparser.c.

                                      {
  lua_State *L = ls->L;
  ++L->nCcalls;
  checklimit(ls->fs, L->nCcalls, LUAI_MAXCCALLS, "C levels");
}

References checklimit(), LexState::fs, LexState::L, LUAI_MAXCCALLS, and lua_State::nCcalls.

error_expected()

static l_noret error_expected ( LexState * ls, int token )

static

Definition at line 77 of file lua-5.2.4/src/lparser.c.

                                                        {
  luaX_syntaxerror(ls,
      luaO_pushfstring(ls->L, "%s expected", luaX_token2str(ls, token)));
}

References LexState::L, luaO_pushfstring(), luaX_syntaxerror(), and luaX_token2str().

Referenced by check(), and check_match().

errorlimit()

static l_noret errorlimit ( FuncState * fs, int limit, const char * what )

static

Definition at line 83 of file lua-5.2.4/src/lparser.c.

                                                                       {
  lua_State *L = fs->ls->L;
  const char *msg;
  int line = fs->f->linedefined;
  const char *where = (line == 0)
                      ? "main function"
                      : luaO_pushfstring(L, "function at line %d", line);
  msg = luaO_pushfstring(L, "too many %s (limit is %d) in %s",
                             what, limit, where);
  luaX_syntaxerror(fs->ls, msg);
}

References FuncState::f, LexState::L, Proto::linedefined, FuncState::ls, luaO_pushfstring(), and luaX_syntaxerror().

Referenced by checklimit().

exp1()

static int exp1 ( LexState * ls )

static

Definition at line 1272 of file lua-5.2.4/src/lparser.c.

                               {
  expdesc e;
  int reg;
  expr(ls, &e);
  luaK_exp2nextreg(ls->fs, &e);
  lua_assert(e.k == VNONRELOC);
  reg = e.u.info;
  return reg;
}

References expr(), LexState::fs, expdesc::info, expdesc::k, lua_assert, luaK_exp2nextreg(), expdesc::u, and VNONRELOC.

Referenced by fornum().

explist()

static int explist ( LexState * ls, expdesc * v )

static

Definition at line 810 of file lua-5.2.4/src/lparser.c.

                                              {
  /* explist -> 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;
}

References expr(), LexState::fs, luaK_exp2nextreg(), testnext(), and ConsControl::v.

Referenced by assignment(), forlist(), funcargs(), localstat(), and retstat().

expr()

static void expr ( LexState * ls, expdesc * v )

static

Definition at line 1067 of file lua-5.2.4/src/lparser.c.

                                            {
  subexpr(ls, v, 0);
}

References subexpr().

Referenced by cond(), exp1(), explist(), listfield(), primaryexp(), recfield(), test_then_block(), and yindex().

exprstat()

static void exprstat ( LexState * ls )

static

Definition at line 1480 of file lua-5.2.4/src/lparser.c.

                                    {
  /* stat -> func | assignment */
  FuncState *fs = ls->fs;
  struct LHS_assign v;
  suffixedexp(ls, &v.v);
  if (ls->t.token == '=' || ls->t.token == ',') { /* stat -> assignment ? */
    v.prev = NULL;
    assignment(ls, &v, 1);
  }
  else {  /* stat -> func */
    check_condition(ls, v.v.k == VCALL, "syntax error");
    SETARG_C(getcode(fs, &v.v), 1);  /* call statement uses no results */
  }
}

References assignment(), check_condition, LexState::fs, getcode, expdesc::k, NULL, SETARG_C, suffixedexp(), LexState::t, Token::token, LHS_assign::v, and VCALL.

Referenced by statement().

field()

static void field ( LexState * ls, struct ConsControl * cc )

static

Definition at line 708 of file lua-5.2.4/src/lparser.c.

                                                         {
  /* field -> listfield | recfield */
  switch(ls->t.token) {
    case TK_NAME: {  /* may be 'listfield' or 'recfield' */
      if (luaX_lookahead(ls) != '=')  /* expression? */
        listfield(ls, cc);
      else
        recfield(ls, cc);
      break;
    }
    case '[': {
      recfield(ls, cc);
      break;
    }
    default: {
      listfield(ls, cc);
      break;
    }
  }
}

References listfield(), luaX_lookahead(), recfield(), LexState::t, TK_NAME, and Token::token.

Referenced by constructor().

fieldsel()

static void fieldsel ( LexState * ls, expdesc * v )

static

Definition at line 616 of file lua-5.2.4/src/lparser.c.

                                                {
  /* fieldsel -> ['.' | ':'] NAME */
  FuncState *fs = ls->fs;
  expdesc key;
  luaK_exp2anyregup(fs, v);
  luaX_next(ls);  /* skip the dot or colon */
  checkname(ls, &key);
  luaK_indexed(fs, v, &key);
}

References checkname(), LexState::fs, luaK_exp2anyregup(), luaK_indexed(), and luaX_next().

Referenced by funcname(), and suffixedexp().

findgotos()

static void findgotos ( LexState * ls, Labeldesc * lb )

static

Definition at line 402 of file lua-5.2.4/src/lparser.c.

                                                    {
  Labellist *gl = &ls->dyd->gt;
  int i = ls->fs->bl->firstgoto;
  while (i < gl->n) {
    if (luaS_eqstr(gl->arr[i].name, lb->name))
      closegoto(ls, i, lb);
    else
      i++;
  }
}

References Labellist::arr, FuncState::bl, closegoto(), LexState::dyd, BlockCnt::firstgoto, LexState::fs, Dyndata::gt, luaS_eqstr(), and Labeldesc::name.

Referenced by breaklabel(), and labelstat().

findlabel()

static int findlabel ( LexState * ls, int g )

static

Definition at line 364 of file lua-5.2.4/src/lparser.c.

                                           {
  int i;
  BlockCnt *bl = ls->fs->bl;
  Dyndata *dyd = ls->dyd;
  Labeldesc *gt = &dyd->gt.arr[g];
  /* check labels in current block for a match */
  for (i = bl->firstlabel; i < dyd->label.n; i++) {
    Labeldesc *lb = &dyd->label.arr[i];
    if (luaS_eqstr(lb->name, gt->name)) {  /* correct label? */
      if (gt->nactvar > lb->nactvar &&
          (bl->upval || dyd->label.n > bl->firstlabel))
        luaK_patchclose(ls->fs, gt->pc, lb->nactvar);
      closegoto(ls, g, lb);  /* close it */
      return 1;
    }
  }
  return 0;  /* label not found; cannot close goto */
}

References Labellist::arr, FuncState::bl, closegoto(), LexState::dyd, BlockCnt::firstlabel, LexState::fs, gt, Dyndata::gt, Dyndata::label, luaK_patchclose(), luaS_eqstr(), Labellist::n, Labeldesc::nactvar, Labeldesc::name, FuncState::pc, and BlockCnt::upval.

Referenced by gotostat(), and movegotosout().

forbody()

static void forbody ( LexState * ls, int base, int line, int nvars, int isnum )

static

Definition at line 1283 of file lua-5.2.4/src/lparser.c.

                                                                             {
  /* forbody -> DO block */
  BlockCnt bl;
  FuncState *fs = ls->fs;
  int prep, endfor;
  adjustlocalvars(ls, 3);  /* control variables */
  checknext(ls, TK_DO);
  prep = isnum ? luaK_codeAsBx(fs, OP_FORPREP, base, NO_JUMP) : luaK_jump(fs);
  enterblock(fs, &bl, 0);  /* scope for declared variables */
  adjustlocalvars(ls, nvars);
  luaK_reserveregs(fs, nvars);
  block(ls);
  leaveblock(fs);  /* end of scope for declared variables */
  luaK_patchtohere(fs, prep);
  if (isnum)  /* numeric for? */
    endfor = luaK_codeAsBx(fs, OP_FORLOOP, base, NO_JUMP);
  else {  /* generic for */
    luaK_codeABC(fs, OP_TFORCALL, base, 0, nvars);
    luaK_fixline(fs, line);
    endfor = luaK_codeAsBx(fs, OP_TFORLOOP, base + 2, NO_JUMP);
  }
  luaK_patchlist(fs, endfor, prep + 1);
  luaK_fixline(fs, line);
}

References adjustlocalvars(), block(), checknext(), enterblock(), LexState::fs, leaveblock(), luaK_codeABC, luaK_codeAsBx, luaK_fixline(), luaK_jump(), luaK_patchlist(), luaK_patchtohere(), luaK_reserveregs(), NO_JUMP, OP_FORLOOP, OP_FORPREP, OP_TFORCALL, OP_TFORLOOP, and TK_DO.

Referenced by forlist(), and fornum().

forlist()

static void forlist ( LexState * ls, TString * indexname )

static

Definition at line 1331 of file lua-5.2.4/src/lparser.c.

                                                       {
  /* forlist -> NAME {,NAME} IN explist forbody */
  FuncState *fs = ls->fs;
  expdesc e;
  int nvars = 4;  /* gen, state, control, plus at least one declared var */
  int line;
  int base = fs->freereg;
  /* create control variables */
  new_localvarliteral(ls, "(for generator)");
  new_localvarliteral(ls, "(for state)");
  new_localvarliteral(ls, "(for control)");
  /* create declared variables */
  new_localvar(ls, indexname);
  while (testnext(ls, ',')) {
    new_localvar(ls, str_checkname(ls));
    nvars++;
  }
  checknext(ls, TK_IN);
  line = ls->linenumber;
  adjust_assign(ls, 3, explist(ls, &e), &e);
  luaK_checkstack(fs, 3);  /* extra space to call generator */
  forbody(ls, base, line, nvars - 3, 0);
}

References adjust_assign(), checknext(), explist(), forbody(), FuncState::freereg, LexState::fs, LexState::linenumber, luaK_checkstack(), new_localvar(), new_localvarliteral, str_checkname(), testnext(), and TK_IN.

Referenced by forstat().

fornum()

static void fornum ( LexState * ls, TString * varname, int line )

static

Definition at line 1309 of file lua-5.2.4/src/lparser.c.

                                                              {
  /* fornum -> NAME = exp1,exp1[,exp1] forbody */
  FuncState *fs = ls->fs;
  int base = fs->freereg;
  new_localvarliteral(ls, "(for index)");
  new_localvarliteral(ls, "(for limit)");
  new_localvarliteral(ls, "(for step)");
  new_localvar(ls, varname);
  checknext(ls, '=');
  exp1(ls);  /* initial value */
  checknext(ls, ',');
  exp1(ls);  /* limit */
  if (testnext(ls, ','))
    exp1(ls);  /* optional step */
  else {  /* default step = 1 */
    luaK_codek(fs, fs->freereg, luaK_numberK(fs, 1));
    luaK_reserveregs(fs, 1);
  }
  forbody(ls, base, line, 1, 1);
}

References checknext(), exp1(), forbody(), FuncState::freereg, LexState::fs, luaK_codek(), luaK_numberK(), luaK_reserveregs(), new_localvar(), new_localvarliteral, and testnext().

Referenced by forstat().

forstat()

static void forstat ( LexState * ls, int line )

static

Definition at line 1356 of file lua-5.2.4/src/lparser.c.

                                             {
  /* forstat -> FOR (fornum | forlist) END */
  FuncState *fs = ls->fs;
  TString *varname;
  BlockCnt bl;
  enterblock(fs, &bl, 1);  /* scope for loop and control variables */
  luaX_next(ls);  /* skip `for' */
  varname = str_checkname(ls);  /* first variable name */
  switch (ls->t.token) {
    case '=': fornum(ls, varname, line); break;
    case ',': case TK_IN: forlist(ls, varname); break;
    default: luaX_syntaxerror(ls, LUA_QL("=") " or " LUA_QL("in") " expected");
  }
  check_match(ls, TK_END, TK_FOR, line);
  leaveblock(fs);  /* loop scope (`break' jumps to this point) */
}

References check_match(), enterblock(), forlist(), fornum(), LexState::fs, leaveblock(), LUA_QL, luaX_next(), luaX_syntaxerror(), str_checkname(), LexState::t, TK_END, TK_FOR, TK_IN, and Token::token.

Referenced by statement().

funcargs()

static void funcargs ( LexState * ls, expdesc * f, int line )

static

Definition at line 823 of file lua-5.2.4/src/lparser.c.

                                                          {
  FuncState *fs = ls->fs;
  expdesc args;
  int base, nparams;
  switch (ls->t.token) {
    case '(': {  /* funcargs -> `(' [ explist ] `)' */
      luaX_next(ls);
      if (ls->t.token == ')')  /* arg list is empty? */
        args.k = VVOID;
      else {
        explist(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");
    }
  }
  lua_assert(f->k == VNONRELOC);
  base = f->u.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 */
}

References check_match(), codestring(), constructor(), explist(), FuncState::freereg, LexState::fs, hasmultret, expdesc::info, init_exp(), expdesc::k, lua_assert, LUA_MULTRET, luaK_codeABC, luaK_exp2nextreg(), luaK_fixline(), luaK_setmultret, luaX_next(), luaX_syntaxerror(), OP_CALL, Token::seminfo, LexState::t, TK_STRING, Token::token, SemInfo::ts, expdesc::u, VCALL, VNONRELOC, and VVOID.

Referenced by suffixedexp().

funcname()

static int funcname ( LexState * ls, expdesc * v )

static

Definition at line 1454 of file lua-5.2.4/src/lparser.c.

                                               {
  /* funcname -> NAME {fieldsel} [`:' NAME] */
  int ismethod = 0;
  singlevar(ls, v);
  while (ls->t.token == '.')
    fieldsel(ls, v);
  if (ls->t.token == ':') {
    ismethod = 1;
    fieldsel(ls, v);
  }
  return ismethod;
}

References fieldsel(), singlevar(), LexState::t, Token::token, and LHS_assign::v.

Referenced by funcstat().

funcstat()

static void funcstat ( LexState * ls, int line )

static

Definition at line 1468 of file lua-5.2.4/src/lparser.c.

                                              {
  /* funcstat -> FUNCTION funcname body */
  int ismethod;
  expdesc v, b;
  luaX_next(ls);  /* skip FUNCTION */
  ismethod = funcname(ls, &v);
  body(ls, &b, ismethod, line);
  luaK_storevar(ls->fs, &v, &b);
  luaK_fixline(ls->fs, line);  /* definition `happens' in the first line */
}

References body(), LexState::fs, funcname(), luaK_fixline(), luaK_storevar(), luaX_next(), and LHS_assign::v.

Referenced by statement().

getbinopr()

static BinOpr getbinopr ( int op )

static

Definition at line 997 of file lua-5.2.4/src/lparser.c.

                                 {
  switch (op) {
    case '+': return OPR_ADD;
    case '-': return OPR_SUB;
    case '*': return OPR_MUL;
    case '/': return OPR_DIV;
    case '%': return OPR_MOD;
    case '^': return OPR_POW;
    case TK_CONCAT: return OPR_CONCAT;
    case TK_NE: return OPR_NE;
    case TK_EQ: return OPR_EQ;
    case '<': return OPR_LT;
    case TK_LE: return OPR_LE;
    case '>': return OPR_GT;
    case TK_GE: return OPR_GE;
    case TK_AND: return OPR_AND;
    case TK_OR: return OPR_OR;
    default: return OPR_NOBINOPR;
  }
}

References OPR_ADD, OPR_AND, OPR_CONCAT, OPR_DIV, OPR_EQ, OPR_GE, OPR_GT, OPR_LE, OPR_LT, OPR_MOD, OPR_MUL, OPR_NE, OPR_NOBINOPR, OPR_OR, OPR_POW, OPR_SUB, TK_AND, TK_CONCAT, TK_EQ, TK_GE, TK_LE, TK_NE, and TK_OR.

Referenced by subexpr().

getlocvar()

static LocVar * getlocvar ( FuncState * fs, int i )

static

Definition at line 198 of file lua-5.2.4/src/lparser.c.

                                                {
  int idx = fs->ls->dyd->actvar.arr[fs->firstlocal + i].idx;
  lua_assert(idx < fs->nlocvars);
  return &fs->f->locvars[idx];
}

References Dyndata::actvar, Dyndata::arr, LexState::dyd, FuncState::f, FuncState::firstlocal, Vardesc::idx, Proto::locvars, FuncState::ls, and lua_assert.

getunopr()

static UnOpr getunopr ( int op )

static

Definition at line 987 of file lua-5.2.4/src/lparser.c.

                               {
  switch (op) {
    case TK_NOT: return OPR_NOT;
    case '-': return OPR_MINUS;
    case '#': return OPR_LEN;
    default: return OPR_NOUNOPR;
  }
}

References OPR_LEN, OPR_MINUS, OPR_NOT, OPR_NOUNOPR, and TK_NOT.

Referenced by subexpr().

gotostat()

static void gotostat ( LexState * ls, int pc )

static

Definition at line 1179 of file lua-5.2.4/src/lparser.c.

                                            {
  int line = ls->linenumber;
  TString *label;
  int g;
  if (testnext(ls, TK_GOTO))
    label = str_checkname(ls);
  else {
    luaX_next(ls);  /* skip break */
    label = luaS_new(ls->L, "break");
  }
  g = newlabelentry(ls, &ls->dyd->gt, label, line, pc);
  findlabel(ls, g);  /* close it if label already defined */
}

References LexState::dyd, findlabel(), Dyndata::gt, LexState::L, LexState::linenumber, luaS_new, luaX_next(), newlabelentry(), str_checkname(), testnext(), and TK_GOTO.

Referenced by statement(), and test_then_block().

ifstat()

static void ifstat ( LexState * ls, int line )

static

Definition at line 1409 of file lua-5.2.4/src/lparser.c.

                                            {
  /* ifstat -> IF cond THEN block {ELSEIF cond THEN block} [ELSE block] END */
  FuncState *fs = ls->fs;
  int escapelist = NO_JUMP;  /* exit list for finished parts */
  test_then_block(ls, &escapelist);  /* IF cond THEN block */
  while (ls->t.token == TK_ELSEIF)
    test_then_block(ls, &escapelist);  /* ELSEIF cond THEN block */
  if (testnext(ls, TK_ELSE))
    block(ls);  /* `else' part */
  check_match(ls, TK_END, TK_IF, line);
  luaK_patchtohere(fs, escapelist);  /* patch escape list to 'if' end */
}

References block(), check_match(), LexState::fs, luaK_patchtohere(), NO_JUMP, LexState::t, test_then_block(), testnext(), TK_ELSE, TK_ELSEIF, TK_END, TK_IF, and Token::token.

Referenced by statement().

init_exp()

static void init_exp ( expdesc * e, expkind k, int i )

static

Definition at line 148 of file lua-5.2.4/src/lparser.c.

                                                    {
  e->f = e->t = NO_JUMP;
  e->k = k;
  e->u.info = i;
}

References expdesc::f, expdesc::info, expdesc::k, NO_JUMP, expdesc::t, and expdesc::u.

Referenced by assignment(), codeclosure(), codestring(), constructor(), funcargs(), mainfunc(), simpleexp(), and singlevaraux().

labelstat()

static void labelstat ( LexState * ls, TString * label, int line )

static

Definition at line 1215 of file lua-5.2.4/src/lparser.c.

                                                               {
  /* label -> '::' NAME '::' */
  FuncState *fs = ls->fs;
  Labellist *ll = &ls->dyd->label;
  int l;  /* index of new label being created */
  checkrepeated(fs, ll, label);  /* check for repeated labels */
  checknext(ls, TK_DBCOLON);  /* skip double colon */
  /* create new entry for this label */
  l = newlabelentry(ls, ll, label, line, fs->pc);
  skipnoopstat(ls);  /* skip other no-op statements */
  if (block_follow(ls, 0)) {  /* label is last no-op statement in the block? */
    /* assume that locals are already out of scope */
    ll->arr[l].nactvar = fs->bl->nactvar;
  }
  findgotos(ls, &ll->arr[l]);
}

References Labellist::arr, FuncState::bl, block_follow(), checknext(), checkrepeated(), LexState::dyd, findgotos(), LexState::fs, Dyndata::label, BlockCnt::nactvar, Labeldesc::nactvar, newlabelentry(), FuncState::pc, skipnoopstat(), and TK_DBCOLON.

Referenced by statement().

lastlistfield()

static void lastlistfield ( FuncState * fs, struct ConsControl * cc )

static

Definition at line 684 of file lua-5.2.4/src/lparser.c.

                                                                  {
  if (cc->tostore == 0) return;
  if (hasmultret(cc->v.k)) {
    luaK_setmultret(fs, &cc->v);
    luaK_setlist(fs, cc->t->u.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.info, cc->na, cc->tostore);
  }
}

References hasmultret, expdesc::info, expdesc::k, LUA_MULTRET, luaK_exp2nextreg(), luaK_setlist(), luaK_setmultret, ConsControl::na, ConsControl::t, ConsControl::tostore, expdesc::u, ConsControl::v, and VVOID.

Referenced by constructor().

leaveblock()

static void leaveblock ( FuncState * fs )

static

Definition at line 472 of file lua-5.2.4/src/lparser.c.

                                       {
  BlockCnt *bl = fs->bl;
  LexState *ls = fs->ls;
  if (bl->previous && bl->upval) {
    /* create a 'jump to here' to close upvalues */
    int j = luaK_jump(fs);
    luaK_patchclose(fs, j, bl->nactvar);
    luaK_patchtohere(fs, j);
  }
  if (bl->isloop)
    breaklabel(ls);  /* close pending breaks */
  fs->bl = bl->previous;
  removevars(fs, bl->nactvar);
  lua_assert(bl->nactvar == fs->nactvar);
  fs->freereg = fs->nactvar;  /* free registers */
  ls->dyd->label.n = bl->firstlabel;  /* remove local labels */
  if (bl->previous)  /* inner block? */
    movegotosout(fs, bl);  /* update pending gotos to outer block */
  else if (bl->firstgoto < ls->dyd->gt.n)  /* pending gotos in outer block? */
    undefgoto(ls, &ls->dyd->gt.arr[bl->firstgoto]);  /* error */
}

References Labellist::arr, FuncState::bl, breaklabel(), LexState::dyd, BlockCnt::firstgoto, BlockCnt::firstlabel, FuncState::freereg, Dyndata::gt, BlockCnt::isloop, Dyndata::label, FuncState::ls, lua_assert, luaK_jump(), luaK_patchclose(), luaK_patchtohere(), movegotosout(), Labellist::n, BlockCnt::nactvar, FuncState::nactvar, BlockCnt::previous, removevars(), undefgoto(), and BlockCnt::upval.

Referenced by block(), close_func(), forbody(), forstat(), repeatstat(), test_then_block(), and whilestat().

listfield()

static void listfield ( LexState * ls, struct ConsControl * cc )

static

Definition at line 699 of file lua-5.2.4/src/lparser.c.

                                                             {
  /* listfield -> exp */
  expr(ls, &cc->v);
  checklimit(ls->fs, cc->na, MAX_INT, "items in a constructor");
  cc->na++;
  cc->tostore++;
}

References checklimit(), expr(), LexState::fs, MAX_INT, ConsControl::na, ConsControl::tostore, and ConsControl::v.

Referenced by field().

localfunc()

static void localfunc ( LexState * ls )

static

Definition at line 1423 of file lua-5.2.4/src/lparser.c.

                                     {
  expdesc b;
  FuncState *fs = ls->fs;
  new_localvar(ls, str_checkname(ls));  /* new local variable */
  adjustlocalvars(ls, 1);  /* enter its scope */
  body(ls, &b, 0, ls->linenumber);  /* function created in next register */
  /* debug information will only see the variable after this point! */
  getlocvar(fs, b.u.info)->startpc = fs->pc;
}

References adjustlocalvars(), body(), LexState::fs, getlocvar, expdesc::info, LexState::linenumber, new_localvar(), FuncState::pc, str_checkname(), and expdesc::u.

Referenced by statement().

localstat()

static void localstat ( LexState * ls )

static

Definition at line 1434 of file lua-5.2.4/src/lparser.c.

                                     {
  /* stat -> LOCAL NAME {`,' NAME} [`=' explist] */
  int nvars = 0;
  int nexps;
  expdesc e;
  do {
    new_localvar(ls, str_checkname(ls));
    nvars++;
  } while (testnext(ls, ','));
  if (testnext(ls, '='))
    nexps = explist(ls, &e);
  else {
    e.k = VVOID;
    nexps = 0;
  }
  adjust_assign(ls, nvars, nexps, &e);
  adjustlocalvars(ls, nvars);
}

References adjust_assign(), adjustlocalvars(), explist(), expdesc::k, new_localvar(), str_checkname(), testnext(), and VVOID.

Referenced by statement().

luaY_parser()

Closure * luaY_parser	(	lua_State *	L,
		ZIO *	z,
		Mbuffer *	buff,
		Dyndata *	dyd,
		const char *	name,
		int	firstchar )

Definition at line 1618 of file lua-5.2.4/src/lparser.c.

                                                                     {
  LexState lexstate;
  FuncState funcstate;
  Closure *cl = luaF_newLclosure(L, 1);  /* create main closure */
  /* anchor closure (to avoid being collected) */
  setclLvalue(L, L->top, cl);
  incr_top(L);
  funcstate.f = cl->l.p = luaF_newproto(L);
  funcstate.f->source = luaS_new(L, name);  /* create and anchor TString */
  lexstate.buff = buff;
  lexstate.dyd = dyd;
  dyd->actvar.n = dyd->gt.n = dyd->label.n = 0;
  luaX_setinput(L, &lexstate, z, funcstate.f->source, firstchar);
  mainfunc(&lexstate, &funcstate);
  lua_assert(!funcstate.prev && funcstate.nups == 1 && !lexstate.fs);
  /* all scopes should be correctly finished */
  lua_assert(dyd->actvar.n == 0 && dyd->gt.n == 0 && dyd->label.n == 0);
  return cl;  /* it's on the stack too */
}

References Dyndata::actvar, LexState::buff, LexState::dyd, FuncState::f, LexState::fs, Dyndata::gt, incr_top, Closure::l, Dyndata::label, lua_assert, luaF_newLclosure(), luaF_newproto(), luaS_new, luaX_setinput(), mainfunc(), Labellist::n, Dyndata::n, name, FuncState::nups, LClosure::p, FuncState::prev, setclLvalue, Proto::source, and lua_State::top.

mainfunc()

static void mainfunc ( LexState * ls, FuncState * fs )

static

Definition at line 1604 of file lua-5.2.4/src/lparser.c.

                                                   {
  BlockCnt bl;
  expdesc v;
  open_func(ls, fs, &bl);
  fs->f->is_vararg = 1;  /* main function is always vararg */
  init_exp(&v, VLOCAL, 0);  /* create and... */
  newupvalue(fs, ls->envn, &v);  /* ...set environment upvalue */
  luaX_next(ls);  /* read first token */
  statlist(ls);  /* parse main body */
  check(ls, TK_EOS);
  close_func(ls);
}

References check, close_func(), LexState::envn, FuncState::f, init_exp(), Proto::is_vararg, luaX_next(), newupvalue(), open_func(), statlist(), TK_EOS, LHS_assign::v, and VLOCAL.

Referenced by luaY_parser().

markupval()

static void markupval ( FuncState * fs, int level )

static

Definition at line 260 of file lua-5.2.4/src/lparser.c.

                                                 {
  BlockCnt *bl = fs->bl;
  while (bl->nactvar > level) bl = bl->previous;
  bl->upval = 1;
}

References FuncState::bl, BlockCnt::nactvar, BlockCnt::previous, and BlockCnt::upval.

Referenced by singlevaraux().

movegotosout()

static void movegotosout ( FuncState * fs, BlockCnt * bl )

static

Definition at line 420 of file lua-5.2.4/src/lparser.c.

                                                       {
  int i = bl->firstgoto;
  Labellist *gl = &fs->ls->dyd->gt;
  /* correct pending gotos to current block and try to close it
     with visible labels */
  while (i < gl->n) {
    Labeldesc *gt = &gl->arr[i];
    if (gt->nactvar > bl->nactvar) {
      if (bl->upval)
        luaK_patchclose(fs, gt->pc, bl->nactvar);
      gt->nactvar = bl->nactvar;
    }
    if (!findlabel(fs->ls, i))
      i++;  /* move to next one */
  }
}

References Labellist::arr, LexState::dyd, findlabel(), BlockCnt::firstgoto, gt, Dyndata::gt, FuncState::ls, luaK_patchclose(), BlockCnt::nactvar, FuncState::pc, and BlockCnt::upval.

Referenced by leaveblock().

new_localvar()

static void new_localvar ( LexState * ls, TString * name )

static

Definition at line 178 of file lua-5.2.4/src/lparser.c.

                                                       {
  FuncState *fs = ls->fs;
  Dyndata *dyd = ls->dyd;
  int reg = registerlocalvar(ls, name);
  checklimit(fs, dyd->actvar.n + 1 - fs->firstlocal,
                  MAXVARS, "local variables");
  luaM_growvector(ls->L, dyd->actvar.arr, dyd->actvar.n + 1,
                  dyd->actvar.size, Vardesc, MAX_INT, "local variables");
  dyd->actvar.arr[dyd->actvar.n++].idx = cast(short, reg);
}

References Dyndata::actvar, Dyndata::arr, cast, checklimit(), LexState::dyd, FuncState::firstlocal, LexState::fs, Vardesc::idx, LexState::L, luaM_growvector, MAX_INT, MAXVARS, Dyndata::n, name, registerlocalvar(), and Dyndata::size.

Referenced by forlist(), fornum(), localfunc(), localstat(), new_localvarliteral_(), and parlist().

new_localvarliteral_()

static void new_localvarliteral_ ( LexState * ls, const char * name, size_t sz )

static

Definition at line 190 of file lua-5.2.4/src/lparser.c.

                                                                             {
  new_localvar(ls, luaX_newstring(ls, name, sz));
}

References luaX_newstring(), name, and new_localvar().

newlabelentry()

static int newlabelentry ( LexState * ls, Labellist * l, TString * name, int line, int pc )

static

Definition at line 384 of file lua-5.2.4/src/lparser.c.

                                            {
  int n = l->n;
  luaM_growvector(ls->L, l->arr, n, l->size,
                  Labeldesc, SHRT_MAX, "labels/gotos");
  l->arr[n].name = name;
  l->arr[n].line = line;
  l->arr[n].nactvar = ls->fs->nactvar;
  l->arr[n].pc = pc;
  l->n++;
  return n;
}

References Labellist::arr, LexState::fs, LexState::L, Labeldesc::line, luaM_growvector, Labellist::n, FuncState::nactvar, Labeldesc::nactvar, name, Labeldesc::name, Labeldesc::pc, and Labellist::size.

Referenced by breaklabel(), gotostat(), and labelstat().

newupvalue()

static int newupvalue ( FuncState * fs, TString * name, expdesc * v )

static

Definition at line 231 of file lua-5.2.4/src/lparser.c.

                                                                 {
  Proto *f = fs->f;
  int oldsize = f->sizeupvalues;
  checklimit(fs, fs->nups + 1, MAXUPVAL, "upvalues");
  luaM_growvector(fs->ls->L, f->upvalues, fs->nups, f->sizeupvalues,
                  Upvaldesc, MAXUPVAL, "upvalues");
  while (oldsize < f->sizeupvalues) f->upvalues[oldsize++].name = NULL;
  f->upvalues[fs->nups].instack = (v->k == VLOCAL);
  f->upvalues[fs->nups].idx = cast_byte(v->u.info);
  f->upvalues[fs->nups].name = name;
  luaC_objbarrier(fs->ls->L, f, name);
  return fs->nups++;
}

References cast_byte, checklimit(), FuncState::f, expdesc::info, expdesc::k, LexState::L, FuncState::ls, luaC_objbarrier, luaM_growvector, MAXUPVAL, name, NULL, FuncState::nups, Proto::sizeupvalues, expdesc::u, Proto::upvalues, and VLOCAL.

Referenced by mainfunc(), and singlevaraux().

open_func()

static void open_func ( LexState * ls, FuncState * fs, BlockCnt * bl )

static

Definition at line 527 of file lua-5.2.4/src/lparser.c.

                                                                  {
  lua_State *L = ls->L;
  Proto *f;
  fs->prev = ls->fs;  /* linked list of funcstates */
  fs->ls = ls;
  ls->fs = fs;
  fs->pc = 0;
  fs->lasttarget = 0;
  fs->jpc = NO_JUMP;
  fs->freereg = 0;
  fs->nk = 0;
  fs->np = 0;
  fs->nups = 0;
  fs->nlocvars = 0;
  fs->nactvar = 0;
  fs->firstlocal = ls->dyd->actvar.n;
  fs->bl = NULL;
  f = fs->f;
  f->source = ls->source;
  f->maxstacksize = 2;  /* registers 0/1 are always valid */
  fs->h = luaH_new(L);
  /* anchor table of constants (to avoid being collected) */
  sethvalue2s(L, L->top, fs->h);
  incr_top(L);
  enterblock(fs, bl, 0);
}

References Dyndata::actvar, FuncState::bl, LexState::dyd, enterblock(), FuncState::f, FuncState::firstlocal, FuncState::freereg, LexState::fs, FuncState::h, incr_top, FuncState::jpc, LexState::L, FuncState::lasttarget, FuncState::ls, luaH_new(), Proto::maxstacksize, Dyndata::n, FuncState::nactvar, FuncState::nk, FuncState::nlocvars, NO_JUMP, FuncState::np, NULL, FuncState::nups, FuncState::pc, FuncState::prev, sethvalue2s, LexState::source, Proto::source, and lua_State::top.

Referenced by body(), and mainfunc().

parlist()

static void parlist ( LexState * ls )

static

Definition at line 759 of file lua-5.2.4/src/lparser.c.

                                   {
  /* 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);
          f->is_vararg = 1;
          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);
  luaK_reserveregs(fs, fs->nactvar);  /* reserve register for parameters */
}

References adjustlocalvars(), cast_byte, FuncState::f, LexState::fs, Proto::is_vararg, LUA_QL, luaK_reserveregs(), luaX_next(), luaX_syntaxerror(), FuncState::nactvar, new_localvar(), Proto::numparams, str_checkname(), LexState::t, testnext(), TK_DOTS, TK_NAME, and Token::token.

Referenced by body().

primaryexp()

static void primaryexp ( LexState * ls, expdesc * v )

static

Definition at line 877 of file lua-5.2.4/src/lparser.c.

                                                  {
  /* primaryexp -> 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");
    }
  }
}

References check_match(), expr(), LexState::fs, LexState::linenumber, luaK_dischargevars(), luaX_next(), luaX_syntaxerror(), singlevar(), LexState::t, TK_NAME, Token::token, and ConsControl::v.

Referenced by suffixedexp().

recfield()

static void recfield ( LexState * ls, struct ConsControl * cc )

static

Definition at line 652 of file lua-5.2.4/src/lparser.c.

                                                            {
  /* recfield -> (NAME | `['exp1`]') = exp1 */
  FuncState *fs = ls->fs;
  int reg = ls->fs->freereg;
  expdesc key, val;
  int rkkey;
  if (ls->t.token == TK_NAME) {
    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.info, rkkey, luaK_exp2RK(fs, &val));
  fs->freereg = reg;  /* free registers */
}

References checklimit(), checkname(), checknext(), expr(), FuncState::freereg, LexState::fs, expdesc::info, luaK_codeABC, luaK_exp2RK(), MAX_INT, ConsControl::nh, OP_SETTABLE, LexState::t, ConsControl::t, TK_NAME, Token::token, expdesc::u, and yindex().

Referenced by field().

registerlocalvar()

static int registerlocalvar ( LexState * ls, TString * varname )

static

Definition at line 165 of file lua-5.2.4/src/lparser.c.

                                                             {
  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, "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++;
}

References FuncState::f, LexState::fs, LexState::L, Proto::locvars, luaC_objbarrier, luaM_growvector, FuncState::nlocvars, NULL, Proto::sizelocvars, and LocVar::varname.

Referenced by new_localvar().

removevars()

static void removevars ( FuncState * fs, int tolevel )

static

Definition at line 214 of file lua-5.2.4/src/lparser.c.

                                                    {
  fs->ls->dyd->actvar.n -= (fs->nactvar - tolevel);
  while (fs->nactvar > tolevel)
    getlocvar(fs, --fs->nactvar)->endpc = fs->pc;
}

References Dyndata::actvar, LexState::dyd, getlocvar, FuncState::ls, Dyndata::n, FuncState::nactvar, and FuncState::pc.

Referenced by leaveblock().

repeatstat()

static void repeatstat ( LexState * ls, int line )

static

Definition at line 1252 of file lua-5.2.4/src/lparser.c.

                                                {
  /* repeatstat -> REPEAT block UNTIL cond */
  int condexit;
  FuncState *fs = ls->fs;
  int repeat_init = luaK_getlabel(fs);
  BlockCnt bl1, bl2;
  enterblock(fs, &bl1, 1);  /* loop block */
  enterblock(fs, &bl2, 0);  /* scope block */
  luaX_next(ls);  /* skip REPEAT */
  statlist(ls);
  check_match(ls, TK_UNTIL, TK_REPEAT, line);
  condexit = cond(ls);  /* read condition (inside scope block) */
  if (bl2.upval)  /* upvalues? */
    luaK_patchclose(fs, condexit, bl2.nactvar);
  leaveblock(fs);  /* finish scope */
  luaK_patchlist(fs, condexit, repeat_init);  /* close the loop */
  leaveblock(fs);  /* finish loop */
}

References check_match(), cond(), enterblock(), LexState::fs, leaveblock(), luaK_getlabel(), luaK_patchclose(), luaK_patchlist(), luaX_next(), BlockCnt::nactvar, statlist(), TK_REPEAT, TK_UNTIL, and BlockCnt::upval.

Referenced by statement().

retstat()

static void retstat ( LexState * ls )

static

Definition at line 1496 of file lua-5.2.4/src/lparser.c.

                                   {
  /* stat -> RETURN [explist] [';'] */
  FuncState *fs = ls->fs;
  expdesc e;
  int first, nret;  /* registers with returned values */
  if (block_follow(ls, 1) || ls->t.token == ';')
    first = nret = 0;  /* return no values */
  else {
    nret = explist(ls, &e);  /* optional return values */
    if (hasmultret(e.k)) {
      luaK_setmultret(fs, &e);
      if (e.k == VCALL && nret == 1) {  /* tail call? */
        SET_OPCODE(getcode(fs,&e), OP_TAILCALL);
        lua_assert(GETARG_A(getcode(fs,&e)) == fs->nactvar);
      }
      first = fs->nactvar;
      nret = LUA_MULTRET;  /* return all values */
    }
    else {
      if (nret == 1)  /* only one single value? */
        first = luaK_exp2anyreg(fs, &e);
      else {
        luaK_exp2nextreg(fs, &e);  /* values must go to the `stack' */
        first = fs->nactvar;  /* return all `active' values */
        lua_assert(nret == fs->freereg - first);
      }
    }
  }
  luaK_ret(fs, first, nret);
  testnext(ls, ';');  /* skip optional semicolon */
}

References block_follow(), explist(), FuncState::freereg, LexState::fs, GETARG_A, getcode, hasmultret, expdesc::k, lua_assert, LUA_MULTRET, luaK_exp2anyreg(), luaK_exp2nextreg(), luaK_ret(), luaK_setmultret, FuncState::nactvar, OP_TAILCALL, SET_OPCODE, LexState::t, testnext(), Token::token, and VCALL.

Referenced by statement().

searchupvalue()

static int searchupvalue ( FuncState * fs, TString * name )

static

Definition at line 221 of file lua-5.2.4/src/lparser.c.

                                                        {
  int i;
  Upvaldesc *up = fs->f->upvalues;
  for (i = 0; i < fs->nups; i++) {
    if (luaS_eqstr(up[i].name, name)) return i;
  }
  return -1;  /* not found */
}

References FuncState::f, luaS_eqstr(), name, FuncState::nups, and Proto::upvalues.

Referenced by singlevaraux().

searchvar()

static int searchvar ( FuncState * fs, TString * n )

static

Definition at line 246 of file lua-5.2.4/src/lparser.c.

                                                 {
  int i;
  for (i = cast_int(fs->nactvar) - 1; i >= 0; i--) {
    if (luaS_eqstr(n, getlocvar(fs, i)->varname))
      return i;
  }
  return -1;  /* not found */
}

References cast_int, getlocvar, luaS_eqstr(), and FuncState::nactvar.

Referenced by singlevaraux().

semerror()

static l_noret semerror ( LexState * ls, const char * msg )

static

Definition at line 71 of file lua-5.2.4/src/lparser.c.

                                                        {
  ls->t.token = 0;  /* remove 'near to' from final message */
  luaX_syntaxerror(ls, msg);
}

References luaX_syntaxerror(), LexState::t, and Token::token.

Referenced by checkrepeated(), closegoto(), and undefgoto().

simpleexp()

static void simpleexp ( LexState * ls, expdesc * v )

static

Definition at line 937 of file lua-5.2.4/src/lparser.c.

                                                 {
  /* simpleexp -> NUMBER | STRING | NIL | TRUE | FALSE | ... |
                  constructor | FUNCTION body | suffixedexp */
  switch (ls->t.token) {
    case TK_NUMBER: {
      init_exp(v, VKNUM, 0);
      v->u.nval = ls->t.seminfo.r;
      break;
    }
    case TK_STRING: {
      codestring(ls, v, ls->t.seminfo.ts);
      break;
    }
    case TK_NIL: {
      init_exp(v, VNIL, 0);
      break;
    }
    case TK_TRUE: {
      init_exp(v, VTRUE, 0);
      break;
    }
    case TK_FALSE: {
      init_exp(v, VFALSE, 0);
      break;
    }
    case TK_DOTS: {  /* vararg */
      FuncState *fs = ls->fs;
      check_condition(ls, fs->f->is_vararg,
                      "cannot use " LUA_QL("...") " outside a vararg function");
      init_exp(v, VVARARG, luaK_codeABC(fs, OP_VARARG, 0, 1, 0));
      break;
    }
    case '{': {  /* constructor */
      constructor(ls, v);
      return;
    }
    case TK_FUNCTION: {
      luaX_next(ls);
      body(ls, v, 0, ls->linenumber);
      return;
    }
    default: {
      suffixedexp(ls, v);
      return;
    }
  }
  luaX_next(ls);
}

References body(), check_condition, codestring(), constructor(), FuncState::f, LexState::fs, init_exp(), Proto::is_vararg, LexState::linenumber, LUA_QL, luaK_codeABC, luaX_next(), expdesc::nval, OP_VARARG, SemInfo::r, Token::seminfo, suffixedexp(), LexState::t, TK_DOTS, TK_FALSE, TK_FUNCTION, TK_NIL, TK_NUMBER, TK_STRING, TK_TRUE, Token::token, SemInfo::ts, expdesc::u, ConsControl::v, VFALSE, VKNUM, VNIL, VTRUE, and VVARARG.

Referenced by subexpr().

singlevar()

static void singlevar ( LexState * ls, expdesc * var )

static

Definition at line 297 of file lua-5.2.4/src/lparser.c.

                                                   {
  TString *varname = str_checkname(ls);
  FuncState *fs = ls->fs;
  if (singlevaraux(fs, varname, var, 1) == VVOID) {  /* global name? */
    expdesc key;
    singlevaraux(fs, ls->envn, var, 1);  /* get environment variable */
    lua_assert(var->k == VLOCAL || var->k == VUPVAL);
    codestring(ls, &key, varname);  /* key is variable name */
    luaK_indexed(fs, var, &key);  /* env[varname] */
  }
}

References codestring(), LexState::envn, LexState::fs, expdesc::k, lua_assert, luaK_indexed(), singlevaraux(), str_checkname(), VLOCAL, VUPVAL, and VVOID.

Referenced by funcname(), and primaryexp().

singlevaraux()

static int singlevaraux ( FuncState * fs, TString * n, expdesc * var, int base )

static

Definition at line 271 of file lua-5.2.4/src/lparser.c.

                                                                            {
  if (fs == NULL)  /* no more levels? */
    return VVOID;  /* default is global */
  else {
    int v = searchvar(fs, n);  /* look up locals at current level */
    if (v >= 0) {  /* found? */
      init_exp(var, VLOCAL, v);  /* variable is local */
      if (!base)
        markupval(fs, v);  /* local will be used as an upval */
      return VLOCAL;
    }
    else {  /* not found as local at current level; try upvalues */
      int idx = searchupvalue(fs, n);  /* try existing upvalues */
      if (idx < 0) {  /* not found? */
        if (singlevaraux(fs->prev, n, var, 0) == VVOID) /* try upper levels */
          return VVOID;  /* not found; is a global */
        /* else was LOCAL or UPVAL */
        idx  = newupvalue(fs, n, var);  /* will be a new upvalue */
      }
      init_exp(var, VUPVAL, idx);
      return VUPVAL;
    }
  }
}

References init_exp(), markupval(), newupvalue(), NULL, FuncState::prev, searchupvalue(), searchvar(), singlevaraux(), VLOCAL, VUPVAL, and VVOID.

Referenced by singlevar(), and singlevaraux().

skipnoopstat()

static void skipnoopstat ( LexState * ls )

static

Definition at line 1209 of file lua-5.2.4/src/lparser.c.

                                        {
  while (ls->t.token == ';' || ls->t.token == TK_DBCOLON)
    statement(ls);
}

References statement(), LexState::t, TK_DBCOLON, and Token::token.

Referenced by labelstat(), and test_then_block().

statement()

static void statement ( LexState * ls )

static

Definition at line 1529 of file lua-5.2.4/src/lparser.c.

                                     {
  int line = ls->linenumber;  /* may be needed for error messages */
  enterlevel(ls);
  switch (ls->t.token) {
    case ';': {  /* stat -> ';' (empty statement) */
      luaX_next(ls);  /* skip ';' */
      break;
    }
    case TK_IF: {  /* stat -> ifstat */
      ifstat(ls, line);
      break;
    }
    case TK_WHILE: {  /* stat -> whilestat */
      whilestat(ls, line);
      break;
    }
    case TK_DO: {  /* stat -> DO block END */
      luaX_next(ls);  /* skip DO */
      block(ls);
      check_match(ls, TK_END, TK_DO, line);
      break;
    }
    case TK_FOR: {  /* stat -> forstat */
      forstat(ls, line);
      break;
    }
    case TK_REPEAT: {  /* stat -> repeatstat */
      repeatstat(ls, line);
      break;
    }
    case TK_FUNCTION: {  /* stat -> funcstat */
      funcstat(ls, line);
      break;
    }
    case TK_LOCAL: {  /* stat -> localstat */
      luaX_next(ls);  /* skip LOCAL */
      if (testnext(ls, TK_FUNCTION))  /* local function? */
        localfunc(ls);
      else
        localstat(ls);
      break;
    }
    case TK_DBCOLON: {  /* stat -> label */
      luaX_next(ls);  /* skip double colon */
      labelstat(ls, str_checkname(ls), line);
      break;
    }
    case TK_RETURN: {  /* stat -> retstat */
      luaX_next(ls);  /* skip RETURN */
      retstat(ls);
      break;
    }
    case TK_BREAK:   /* stat -> breakstat */
    case TK_GOTO: {  /* stat -> 'goto' NAME */
      gotostat(ls, luaK_jump(ls->fs));
      break;
    }
    default: {  /* stat -> func | assignment */
      exprstat(ls);
      break;
    }
  }
  lua_assert(ls->fs->f->maxstacksize >= ls->fs->freereg &&
             ls->fs->freereg >= ls->fs->nactvar);
  ls->fs->freereg = ls->fs->nactvar;  /* free registers */
  leavelevel(ls);
}

References block(), check_match(), enterlevel, exprstat(), FuncState::f, forstat(), FuncState::freereg, LexState::fs, funcstat(), gotostat(), ifstat(), labelstat(), leavelevel, LexState::linenumber, localfunc(), localstat(), lua_assert, luaK_jump(), luaX_next(), Proto::maxstacksize, FuncState::nactvar, repeatstat(), retstat(), str_checkname(), LexState::t, testnext(), TK_BREAK, TK_DBCOLON, TK_DO, TK_END, TK_FOR, TK_FUNCTION, TK_GOTO, TK_IF, TK_LOCAL, TK_REPEAT, TK_RETURN, TK_WHILE, Token::token, and whilestat().

Referenced by skipnoopstat(), and statlist().

statlist()

static void statlist ( LexState * ls )

static

Definition at line 604 of file lua-5.2.4/src/lparser.c.

                                    {
  /* statlist -> { stat [`;'] } */
  while (!block_follow(ls, 1)) {
    if (ls->t.token == TK_RETURN) {
      statement(ls);
      return;  /* 'return' must be last statement */
    }
    statement(ls);
  }
}

References block_follow(), statement(), LexState::t, TK_RETURN, and Token::token.

Referenced by block(), body(), mainfunc(), repeatstat(), and test_then_block().

str_checkname()

static TString * str_checkname ( LexState * ls )

static

Definition at line 139 of file lua-5.2.4/src/lparser.c.

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

References check, luaX_next(), Token::seminfo, LexState::t, TK_NAME, and SemInfo::ts.

Referenced by checkname(), forlist(), forstat(), gotostat(), localfunc(), localstat(), parlist(), singlevar(), and statement().

subexpr()

static BinOpr subexpr ( LexState * ls, expdesc * v, int limit )

static

Definition at line 1037 of file lua-5.2.4/src/lparser.c.

                                                            {
  BinOpr op;
  UnOpr uop;
  enterlevel(ls);
  uop = getunopr(ls->t.token);
  if (uop != OPR_NOUNOPR) {
    int line = ls->linenumber;
    luaX_next(ls);
    subexpr(ls, v, UNARY_PRIORITY);
    luaK_prefix(ls->fs, uop, v, line);
  }
  else simpleexp(ls, v);
  /* expand while operators have priorities higher than `limit' */
  op = getbinopr(ls->t.token);
  while (op != OPR_NOBINOPR && priority[op].left > limit) {
    expdesc v2;
    BinOpr nextop;
    int line = ls->linenumber;
    luaX_next(ls);
    luaK_infix(ls->fs, op, v);
    /* read sub-expression with higher priority */
    nextop = subexpr(ls, &v2, priority[op].right);
    luaK_posfix(ls->fs, op, v, &v2, line);
    op = nextop;
  }
  leavelevel(ls);
  return op;  /* return first untreated operator */
}

References enterlevel, LexState::fs, getbinopr(), getunopr(), leavelevel, left, LexState::linenumber, luaK_infix(), luaK_posfix(), luaK_prefix(), luaX_next(), OPR_NOBINOPR, OPR_NOUNOPR, priority, right, simpleexp(), subexpr(), LexState::t, Token::token, and UNARY_PRIORITY.

Referenced by expr(), and subexpr().

suffixedexp()

static void suffixedexp ( LexState * ls, expdesc * v )

static

Definition at line 899 of file lua-5.2.4/src/lparser.c.

                                                   {
  /* suffixedexp ->
       primaryexp { '.' NAME | '[' exp ']' | ':' NAME funcargs | funcargs } */
  FuncState *fs = ls->fs;
  int line = ls->linenumber;
  primaryexp(ls, v);
  for (;;) {
    switch (ls->t.token) {
      case '.': {  /* fieldsel */
        fieldsel(ls, v);
        break;
      }
      case '[': {  /* `[' exp1 `]' */
        expdesc key;
        luaK_exp2anyregup(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, line);
        break;
      }
      case '(': case TK_STRING: case '{': {  /* funcargs */
        luaK_exp2nextreg(fs, v);
        funcargs(ls, v, line);
        break;
      }
      default: return;
    }
  }
}

References checkname(), fieldsel(), LexState::fs, funcargs(), LexState::linenumber, luaK_exp2anyregup(), luaK_exp2nextreg(), luaK_indexed(), luaK_self(), luaX_next(), primaryexp(), LexState::t, TK_STRING, Token::token, ConsControl::v, and yindex().

Referenced by assignment(), exprstat(), and simpleexp().

test_then_block()

static void test_then_block ( LexState * ls, int * escapelist )

static

Definition at line 1374 of file lua-5.2.4/src/lparser.c.

                                                            {
  /* test_then_block -> [IF | ELSEIF] cond THEN block */
  BlockCnt bl;
  FuncState *fs = ls->fs;
  expdesc v;
  int jf;  /* instruction to skip 'then' code (if condition is false) */
  luaX_next(ls);  /* skip IF or ELSEIF */
  expr(ls, &v);  /* read condition */
  checknext(ls, TK_THEN);
  if (ls->t.token == TK_GOTO || ls->t.token == TK_BREAK) {
    luaK_goiffalse(ls->fs, &v);  /* will jump to label if condition is true */
    enterblock(fs, &bl, 0);  /* must enter block before 'goto' */
    gotostat(ls, v.t);  /* handle goto/break */
    skipnoopstat(ls);  /* skip other no-op statements */
    if (block_follow(ls, 0)) {  /* 'goto' is the entire block? */
      leaveblock(fs);
      return;  /* and that is it */
    }
    else  /* must skip over 'then' part if condition is false */
      jf = luaK_jump(fs);
  }
  else {  /* regular case (not goto/break) */
    luaK_goiftrue(ls->fs, &v);  /* skip over block if condition is false */
    enterblock(fs, &bl, 0);
    jf = v.f;
  }
  statlist(ls);  /* `then' part */
  leaveblock(fs);
  if (ls->t.token == TK_ELSE ||
      ls->t.token == TK_ELSEIF)  /* followed by 'else'/'elseif'? */
    luaK_concat(fs, escapelist, luaK_jump(fs));  /* must jump over it */
  luaK_patchtohere(fs, jf);
}

References block_follow(), checknext(), enterblock(), expr(), expdesc::f, LexState::fs, gotostat(), leaveblock(), luaK_concat(), luaK_goiffalse(), luaK_goiftrue(), luaK_jump(), luaK_patchtohere(), luaX_next(), skipnoopstat(), statlist(), LexState::t, expdesc::t, TK_BREAK, TK_ELSE, TK_ELSEIF, TK_GOTO, TK_THEN, Token::token, and LHS_assign::v.

Referenced by ifstat().

testnext()

static int testnext ( LexState * ls, int c )

static

Definition at line 101 of file lua-5.2.4/src/lparser.c.

                                          {
  if (ls->t.token == c) {
    luaX_next(ls);
    return 1;
  }
  else return 0;
}

References luaX_next(), LexState::t, and Token::token.

Referenced by assignment(), check_match(), constructor(), explist(), forlist(), fornum(), gotostat(), ifstat(), localstat(), parlist(), retstat(), and statement().

undefgoto()

static l_noret undefgoto ( LexState * ls, Labeldesc * gt )

static

Definition at line 463 of file lua-5.2.4/src/lparser.c.

                                                       {
  const char *msg = isreserved(gt->name)
                    ? "<%s> at line %d not inside a loop"
                    : "no visible label " LUA_QS " for <goto> at line %d";
  msg = luaO_pushfstring(ls->L, msg, getstr(gt->name), gt->line);
  semerror(ls, msg);
}

References getstr, gt, isreserved, LexState::L, LUA_QS, luaO_pushfstring(), and semerror().

Referenced by leaveblock().

whilestat()

static void whilestat ( LexState * ls, int line )

static

Definition at line 1233 of file lua-5.2.4/src/lparser.c.

                                               {
  /* whilestat -> WHILE cond DO block END */
  FuncState *fs = ls->fs;
  int whileinit;
  int condexit;
  BlockCnt bl;
  luaX_next(ls);  /* skip WHILE */
  whileinit = luaK_getlabel(fs);
  condexit = cond(ls);
  enterblock(fs, &bl, 1);
  checknext(ls, TK_DO);
  block(ls);
  luaK_jumpto(fs, whileinit);
  check_match(ls, TK_END, TK_WHILE, line);
  leaveblock(fs);
  luaK_patchtohere(fs, condexit);  /* false conditions finish the loop */
}

References block(), check_match(), checknext(), cond(), enterblock(), LexState::fs, leaveblock(), luaK_getlabel(), luaK_jumpto, luaK_patchtohere(), luaX_next(), TK_DO, TK_END, and TK_WHILE.

Referenced by statement().

yindex()

static void yindex ( LexState * ls, expdesc * v )

static

Definition at line 627 of file lua-5.2.4/src/lparser.c.

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

References checknext(), expr(), LexState::fs, luaK_exp2val(), and luaX_next().

Referenced by recfield(), and suffixedexp().

Variable Documentation

left

lu_byte left

Definition at line 1020 of file lua-5.2.4/src/lparser.c.

Referenced by subexpr().

[struct]

const struct { ... } priority[]

Initial value:

= {  
   {6, 6}, {6, 6}, {7, 7}, {7, 7}, {7, 7},  
   {10, 9}, {5, 4},                 
   {3, 3}, {3, 3}, {3, 3},          
   {3, 3}, {3, 3}, {3, 3},          
   {2, 2}, {1, 1}                   
}

Referenced by subexpr().

right

lu_byte right

Definition at line 1021 of file lua-5.2.4/src/lparser.c.

Referenced by subexpr().