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toke.c
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/* toke.c
*
* Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
* 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 by Larry Wall and others
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
*
*/
/*
* 'It all comes from here, the stench and the peril.' --Frodo
*
* [p.719 of _The Lord of the Rings_, IV/ix: "Shelob's Lair"]
*/
/*
* This file is the lexer for Perl. It's closely linked to the
* parser, perly.y.
*
* The main routine is yylex(), which returns the next token.
*/
#include "EXTERN.h"
#define PERL_IN_TOKE_C
#include "perl.h"
#define new_constant(a,b,c,d,e,f,g) \
S_new_constant(aTHX_ a,b,STR_WITH_LEN(c),d,e,f, g)
#define pl_yylval (PL_parser->yylval)
/* YYINITDEPTH -- initial size of the parser's stacks. */
#define YYINITDEPTH 200
/* XXX temporary backwards compatibility */
#define PL_lex_brackets (PL_parser->lex_brackets)
#define PL_lex_brackstack (PL_parser->lex_brackstack)
#define PL_lex_casemods (PL_parser->lex_casemods)
#define PL_lex_casestack (PL_parser->lex_casestack)
#define PL_lex_defer (PL_parser->lex_defer)
#define PL_lex_dojoin (PL_parser->lex_dojoin)
#define PL_lex_expect (PL_parser->lex_expect)
#define PL_lex_formbrack (PL_parser->lex_formbrack)
#define PL_lex_inpat (PL_parser->lex_inpat)
#define PL_lex_inwhat (PL_parser->lex_inwhat)
#define PL_lex_op (PL_parser->lex_op)
#define PL_lex_repl (PL_parser->lex_repl)
#define PL_lex_starts (PL_parser->lex_starts)
#define PL_lex_stuff (PL_parser->lex_stuff)
#define PL_multi_start (PL_parser->multi_start)
#define PL_multi_open (PL_parser->multi_open)
#define PL_multi_close (PL_parser->multi_close)
#define PL_pending_ident (PL_parser->pending_ident)
#define PL_preambled (PL_parser->preambled)
#define PL_sublex_info (PL_parser->sublex_info)
#define PL_linestr (PL_parser->linestr)
#define PL_expect (PL_parser->expect)
#define PL_copline (PL_parser->copline)
#define PL_bufptr (PL_parser->bufptr)
#define PL_oldbufptr (PL_parser->oldbufptr)
#define PL_oldoldbufptr (PL_parser->oldoldbufptr)
#define PL_linestart (PL_parser->linestart)
#define PL_bufend (PL_parser->bufend)
#define PL_last_uni (PL_parser->last_uni)
#define PL_last_lop (PL_parser->last_lop)
#define PL_last_lop_op (PL_parser->last_lop_op)
#define PL_lex_state (PL_parser->lex_state)
#define PL_rsfp (PL_parser->rsfp)
#define PL_rsfp_filters (PL_parser->rsfp_filters)
#define PL_in_my (PL_parser->in_my)
#define PL_in_my_stash (PL_parser->in_my_stash)
#define PL_tokenbuf (PL_parser->tokenbuf)
#define PL_multi_end (PL_parser->multi_end)
#define PL_error_count (PL_parser->error_count)
#ifdef PERL_MAD
# define PL_endwhite (PL_parser->endwhite)
# define PL_faketokens (PL_parser->faketokens)
# define PL_lasttoke (PL_parser->lasttoke)
# define PL_nextwhite (PL_parser->nextwhite)
# define PL_realtokenstart (PL_parser->realtokenstart)
# define PL_skipwhite (PL_parser->skipwhite)
# define PL_thisclose (PL_parser->thisclose)
# define PL_thismad (PL_parser->thismad)
# define PL_thisopen (PL_parser->thisopen)
# define PL_thisstuff (PL_parser->thisstuff)
# define PL_thistoken (PL_parser->thistoken)
# define PL_thiswhite (PL_parser->thiswhite)
# define PL_thiswhite (PL_parser->thiswhite)
# define PL_nexttoke (PL_parser->nexttoke)
# define PL_curforce (PL_parser->curforce)
#else
# define PL_nexttoke (PL_parser->nexttoke)
# define PL_nexttype (PL_parser->nexttype)
# define PL_nextval (PL_parser->nextval)
#endif
static int
S_pending_ident(pTHX);
static const char ident_too_long[] = "Identifier too long";
static const char commaless_variable_list[] = "comma-less variable list";
#ifndef PERL_NO_UTF16_FILTER
static I32 utf16_textfilter(pTHX_ int idx, SV *sv, int maxlen);
static I32 utf16rev_textfilter(pTHX_ int idx, SV *sv, int maxlen);
#endif
#ifdef PERL_MAD
# define CURMAD(slot,sv) if (PL_madskills) { curmad(slot,sv); sv = 0; }
# define NEXTVAL_NEXTTOKE PL_nexttoke[PL_curforce].next_val
#else
# define CURMAD(slot,sv)
# define NEXTVAL_NEXTTOKE PL_nextval[PL_nexttoke]
#endif
#define XFAKEBRACK 128
#define XENUMMASK 127
#ifdef USE_UTF8_SCRIPTS
# define UTF (!IN_BYTES)
#else
# define UTF ((PL_linestr && DO_UTF8(PL_linestr)) || (PL_hints & HINT_UTF8))
#endif
/* In variables named $^X, these are the legal values for X.
* 1999-02-27 [email protected] */
#define isCONTROLVAR(x) (isUPPER(x) || strchr("[\\]^_?", (x)))
/* On MacOS, respect nonbreaking spaces */
#ifdef MACOS_TRADITIONAL
#define SPACE_OR_TAB(c) ((c)==' '||(c)=='\312'||(c)=='\t')
#else
#define SPACE_OR_TAB(c) ((c)==' '||(c)=='\t')
#endif
/* LEX_* are values for PL_lex_state, the state of the lexer.
* They are arranged oddly so that the guard on the switch statement
* can get by with a single comparison (if the compiler is smart enough).
*/
/* #define LEX_NOTPARSING 11 is done in perl.h. */
#define LEX_NORMAL 10 /* normal code (ie not within "...") */
#define LEX_INTERPNORMAL 9 /* code within a string, eg "$foo[$x+1]" */
#define LEX_INTERPCASEMOD 8 /* expecting a \U, \Q or \E etc */
#define LEX_INTERPPUSH 7 /* starting a new sublex parse level */
#define LEX_INTERPSTART 6 /* expecting the start of a $var */
/* at end of code, eg "$x" followed by: */
#define LEX_INTERPEND 5 /* ... eg not one of [, { or -> */
#define LEX_INTERPENDMAYBE 4 /* ... eg one of [, { or -> */
#define LEX_INTERPCONCAT 3 /* expecting anything, eg at start of
string or after \E, $foo, etc */
#define LEX_INTERPCONST 2 /* NOT USED */
#define LEX_FORMLINE 1 /* expecting a format line */
#define LEX_KNOWNEXT 0 /* next token known; just return it */
#ifdef DEBUGGING
static const char* const lex_state_names[] = {
"KNOWNEXT",
"FORMLINE",
"INTERPCONST",
"INTERPCONCAT",
"INTERPENDMAYBE",
"INTERPEND",
"INTERPSTART",
"INTERPPUSH",
"INTERPCASEMOD",
"INTERPNORMAL",
"NORMAL"
};
#endif
#ifdef ff_next
#undef ff_next
#endif
#include "keywords.h"
/* CLINE is a macro that ensures PL_copline has a sane value */
#ifdef CLINE
#undef CLINE
#endif
#define CLINE (PL_copline = (CopLINE(PL_curcop) < PL_copline ? CopLINE(PL_curcop) : PL_copline))
#ifdef PERL_MAD
# define SKIPSPACE0(s) skipspace0(s)
# define SKIPSPACE1(s) skipspace1(s)
# define SKIPSPACE2(s,tsv) skipspace2(s,&tsv)
# define PEEKSPACE(s) skipspace2(s,0)
#else
# define SKIPSPACE0(s) skipspace(s)
# define SKIPSPACE1(s) skipspace(s)
# define SKIPSPACE2(s,tsv) skipspace(s)
# define PEEKSPACE(s) skipspace(s)
#endif
/*
* Convenience functions to return different tokens and prime the
* lexer for the next token. They all take an argument.
*
* TOKEN : generic token (used for '(', DOLSHARP, etc)
* OPERATOR : generic operator
* AOPERATOR : assignment operator
* PREBLOCK : beginning the block after an if, while, foreach, ...
* PRETERMBLOCK : beginning a non-code-defining {} block (eg, hash ref)
* PREREF : *EXPR where EXPR is not a simple identifier
* TERM : expression term
* LOOPX : loop exiting command (goto, last, dump, etc)
* FTST : file test operator
* FUN0 : zero-argument function
* FUN1 : not used, except for not, which isn't a UNIOP
* BOop : bitwise or or xor
* BAop : bitwise and
* SHop : shift operator
* PWop : power operator
* PMop : pattern-matching operator
* Aop : addition-level operator
* Mop : multiplication-level operator
* Eop : equality-testing operator
* Rop : relational operator <= != gt
*
* Also see LOP and lop() below.
*/
#ifdef DEBUGGING /* Serve -DT. */
# define REPORT(retval) tokereport((I32)retval, &pl_yylval)
#else
# define REPORT(retval) (retval)
#endif
#define TOKEN(retval) return ( PL_bufptr = s, REPORT(retval))
#define OPERATOR(retval) return (PL_expect = XTERM, PL_bufptr = s, REPORT(retval))
#define AOPERATOR(retval) return ao((PL_expect = XTERM, PL_bufptr = s, REPORT(retval)))
#define PREBLOCK(retval) return (PL_expect = XBLOCK,PL_bufptr = s, REPORT(retval))
#define PRETERMBLOCK(retval) return (PL_expect = XTERMBLOCK,PL_bufptr = s, REPORT(retval))
#define PREREF(retval) return (PL_expect = XREF,PL_bufptr = s, REPORT(retval))
#define TERM(retval) return (CLINE, PL_expect = XOPERATOR, PL_bufptr = s, REPORT(retval))
#define LOOPX(f) return (pl_yylval.ival=f, PL_expect=XTERM, PL_bufptr=s, REPORT((int)LOOPEX))
#define FTST(f) return (pl_yylval.ival=f, PL_expect=XTERMORDORDOR, PL_bufptr=s, REPORT((int)UNIOP))
#define FUN0(f) return (pl_yylval.ival=f, PL_expect=XOPERATOR, PL_bufptr=s, REPORT((int)FUNC0))
#define FUN1(f) return (pl_yylval.ival=f, PL_expect=XOPERATOR, PL_bufptr=s, REPORT((int)FUNC1))
#define BOop(f) return ao((pl_yylval.ival=f, PL_expect=XTERM, PL_bufptr=s, REPORT((int)BITOROP)))
#define BAop(f) return ao((pl_yylval.ival=f, PL_expect=XTERM, PL_bufptr=s, REPORT((int)BITANDOP)))
#define SHop(f) return ao((pl_yylval.ival=f, PL_expect=XTERM, PL_bufptr=s, REPORT((int)SHIFTOP)))
#define PWop(f) return ao((pl_yylval.ival=f, PL_expect=XTERM, PL_bufptr=s, REPORT((int)POWOP)))
#define PMop(f) return(pl_yylval.ival=f, PL_expect=XTERM, PL_bufptr=s, REPORT((int)MATCHOP))
#define Aop(f) return ao((pl_yylval.ival=f, PL_expect=XTERM, PL_bufptr=s, REPORT((int)ADDOP)))
#define Mop(f) return ao((pl_yylval.ival=f, PL_expect=XTERM, PL_bufptr=s, REPORT((int)MULOP)))
#define Eop(f) return (pl_yylval.ival=f, PL_expect=XTERM, PL_bufptr=s, REPORT((int)EQOP))
#define Rop(f) return (pl_yylval.ival=f, PL_expect=XTERM, PL_bufptr=s, REPORT((int)RELOP))
/* This bit of chicanery makes a unary function followed by
* a parenthesis into a function with one argument, highest precedence.
* The UNIDOR macro is for unary functions that can be followed by the //
* operator (such as C<shift // 0>).
*/
#define UNI2(f,x) { \
pl_yylval.ival = f; \
PL_expect = x; \
PL_bufptr = s; \
PL_last_uni = PL_oldbufptr; \
PL_last_lop_op = f; \
if (*s == '(') \
return REPORT( (int)FUNC1 ); \
s = PEEKSPACE(s); \
return REPORT( *s=='(' ? (int)FUNC1 : (int)UNIOP ); \
}
#define UNI(f) UNI2(f,XTERM)
#define UNIDOR(f) UNI2(f,XTERMORDORDOR)
#define UNIBRACK(f) { \
pl_yylval.ival = f; \
PL_bufptr = s; \
PL_last_uni = PL_oldbufptr; \
if (*s == '(') \
return REPORT( (int)FUNC1 ); \
s = PEEKSPACE(s); \
return REPORT( (*s == '(') ? (int)FUNC1 : (int)UNIOP ); \
}
/* grandfather return to old style */
#define OLDLOP(f) return(pl_yylval.ival=f,PL_expect = XTERM,PL_bufptr = s,(int)LSTOP)
#ifdef DEBUGGING
/* how to interpret the pl_yylval associated with the token */
enum token_type {
TOKENTYPE_NONE,
TOKENTYPE_IVAL,
TOKENTYPE_OPNUM, /* pl_yylval.ival contains an opcode number */
TOKENTYPE_PVAL,
TOKENTYPE_OPVAL,
TOKENTYPE_GVVAL
};
static struct debug_tokens {
const int token;
enum token_type type;
const char *name;
} const debug_tokens[] =
{
{ ADDOP, TOKENTYPE_OPNUM, "ADDOP" },
{ ANDAND, TOKENTYPE_NONE, "ANDAND" },
{ ANDOP, TOKENTYPE_NONE, "ANDOP" },
{ ANONSUB, TOKENTYPE_IVAL, "ANONSUB" },
{ ARROW, TOKENTYPE_NONE, "ARROW" },
{ ASSIGNOP, TOKENTYPE_OPNUM, "ASSIGNOP" },
{ BITANDOP, TOKENTYPE_OPNUM, "BITANDOP" },
{ BITOROP, TOKENTYPE_OPNUM, "BITOROP" },
{ COLONATTR, TOKENTYPE_NONE, "COLONATTR" },
{ CONTINUE, TOKENTYPE_NONE, "CONTINUE" },
{ DEFAULT, TOKENTYPE_NONE, "DEFAULT" },
{ DO, TOKENTYPE_NONE, "DO" },
{ DOLSHARP, TOKENTYPE_NONE, "DOLSHARP" },
{ DORDOR, TOKENTYPE_NONE, "DORDOR" },
{ DOROP, TOKENTYPE_OPNUM, "DOROP" },
{ DOTDOT, TOKENTYPE_IVAL, "DOTDOT" },
{ ELSE, TOKENTYPE_NONE, "ELSE" },
{ ELSIF, TOKENTYPE_IVAL, "ELSIF" },
{ EQOP, TOKENTYPE_OPNUM, "EQOP" },
{ FOR, TOKENTYPE_IVAL, "FOR" },
{ FORMAT, TOKENTYPE_NONE, "FORMAT" },
{ FUNC, TOKENTYPE_OPNUM, "FUNC" },
{ FUNC0, TOKENTYPE_OPNUM, "FUNC0" },
{ FUNC0SUB, TOKENTYPE_OPVAL, "FUNC0SUB" },
{ FUNC1, TOKENTYPE_OPNUM, "FUNC1" },
{ FUNCMETH, TOKENTYPE_OPVAL, "FUNCMETH" },
{ GIVEN, TOKENTYPE_IVAL, "GIVEN" },
{ HASHBRACK, TOKENTYPE_NONE, "HASHBRACK" },
{ IF, TOKENTYPE_IVAL, "IF" },
{ LABEL, TOKENTYPE_PVAL, "LABEL" },
{ LOCAL, TOKENTYPE_IVAL, "LOCAL" },
{ LOOPEX, TOKENTYPE_OPNUM, "LOOPEX" },
{ LSTOP, TOKENTYPE_OPNUM, "LSTOP" },
{ LSTOPSUB, TOKENTYPE_OPVAL, "LSTOPSUB" },
{ MATCHOP, TOKENTYPE_OPNUM, "MATCHOP" },
{ METHOD, TOKENTYPE_OPVAL, "METHOD" },
{ MULOP, TOKENTYPE_OPNUM, "MULOP" },
{ MY, TOKENTYPE_IVAL, "MY" },
{ MYSUB, TOKENTYPE_NONE, "MYSUB" },
{ NOAMP, TOKENTYPE_NONE, "NOAMP" },
{ NOTOP, TOKENTYPE_NONE, "NOTOP" },
{ OROP, TOKENTYPE_IVAL, "OROP" },
{ OROR, TOKENTYPE_NONE, "OROR" },
{ PACKAGE, TOKENTYPE_NONE, "PACKAGE" },
{ PMFUNC, TOKENTYPE_OPVAL, "PMFUNC" },
{ POSTDEC, TOKENTYPE_NONE, "POSTDEC" },
{ POSTINC, TOKENTYPE_NONE, "POSTINC" },
{ POWOP, TOKENTYPE_OPNUM, "POWOP" },
{ PREDEC, TOKENTYPE_NONE, "PREDEC" },
{ PREINC, TOKENTYPE_NONE, "PREINC" },
{ PRIVATEREF, TOKENTYPE_OPVAL, "PRIVATEREF" },
{ REFGEN, TOKENTYPE_NONE, "REFGEN" },
{ RELOP, TOKENTYPE_OPNUM, "RELOP" },
{ SHIFTOP, TOKENTYPE_OPNUM, "SHIFTOP" },
{ SUB, TOKENTYPE_NONE, "SUB" },
{ THING, TOKENTYPE_OPVAL, "THING" },
{ UMINUS, TOKENTYPE_NONE, "UMINUS" },
{ UNIOP, TOKENTYPE_OPNUM, "UNIOP" },
{ UNIOPSUB, TOKENTYPE_OPVAL, "UNIOPSUB" },
{ UNLESS, TOKENTYPE_IVAL, "UNLESS" },
{ UNTIL, TOKENTYPE_IVAL, "UNTIL" },
{ USE, TOKENTYPE_IVAL, "USE" },
{ WHEN, TOKENTYPE_IVAL, "WHEN" },
{ WHILE, TOKENTYPE_IVAL, "WHILE" },
{ WORD, TOKENTYPE_OPVAL, "WORD" },
{ 0, TOKENTYPE_NONE, NULL }
};
/* dump the returned token in rv, plus any optional arg in pl_yylval */
STATIC int
S_tokereport(pTHX_ I32 rv, const YYSTYPE* lvalp)
{
dVAR;
PERL_ARGS_ASSERT_TOKEREPORT;
if (DEBUG_T_TEST) {
const char *name = NULL;
enum token_type type = TOKENTYPE_NONE;
const struct debug_tokens *p;
SV* const report = newSVpvs("<== ");
for (p = debug_tokens; p->token; p++) {
if (p->token == (int)rv) {
name = p->name;
type = p->type;
break;
}
}
if (name)
Perl_sv_catpv(aTHX_ report, name);
else if ((char)rv > ' ' && (char)rv < '~')
Perl_sv_catpvf(aTHX_ report, "'%c'", (char)rv);
else if (!rv)
sv_catpvs(report, "EOF");
else
Perl_sv_catpvf(aTHX_ report, "?? %"IVdf, (IV)rv);
switch (type) {
case TOKENTYPE_NONE:
case TOKENTYPE_GVVAL: /* doesn't appear to be used */
break;
case TOKENTYPE_IVAL:
Perl_sv_catpvf(aTHX_ report, "(ival=%"IVdf")", (IV)lvalp->ival);
break;
case TOKENTYPE_OPNUM:
Perl_sv_catpvf(aTHX_ report, "(ival=op_%s)",
PL_op_name[lvalp->ival]);
break;
case TOKENTYPE_PVAL:
Perl_sv_catpvf(aTHX_ report, "(pval=\"%s\")", lvalp->pval);
break;
case TOKENTYPE_OPVAL:
if (lvalp->opval) {
Perl_sv_catpvf(aTHX_ report, "(opval=op_%s)",
PL_op_name[lvalp->opval->op_type]);
if (lvalp->opval->op_type == OP_CONST) {
Perl_sv_catpvf(aTHX_ report, " %s",
SvPEEK(cSVOPx_sv(lvalp->opval)));
}
}
else
sv_catpvs(report, "(opval=null)");
break;
}
PerlIO_printf(Perl_debug_log, "### %s\n\n", SvPV_nolen_const(report));
};
return (int)rv;
}
/* print the buffer with suitable escapes */
STATIC void
S_printbuf(pTHX_ const char* fmt, const char* s)
{
SV* const tmp = newSVpvs("");
PERL_ARGS_ASSERT_PRINTBUF;
PerlIO_printf(Perl_debug_log, fmt, pv_display(tmp, s, strlen(s), 0, 60));
SvREFCNT_dec(tmp);
}
#endif
/*
* S_ao
*
* This subroutine detects &&=, ||=, and //= and turns an ANDAND, OROR or DORDOR
* into an OP_ANDASSIGN, OP_ORASSIGN, or OP_DORASSIGN
*/
STATIC int
S_ao(pTHX_ int toketype)
{
dVAR;
if (*PL_bufptr == '=') {
PL_bufptr++;
if (toketype == ANDAND)
pl_yylval.ival = OP_ANDASSIGN;
else if (toketype == OROR)
pl_yylval.ival = OP_ORASSIGN;
else if (toketype == DORDOR)
pl_yylval.ival = OP_DORASSIGN;
toketype = ASSIGNOP;
}
return toketype;
}
/*
* S_no_op
* When Perl expects an operator and finds something else, no_op
* prints the warning. It always prints "<something> found where
* operator expected. It prints "Missing semicolon on previous line?"
* if the surprise occurs at the start of the line. "do you need to
* predeclare ..." is printed out for code like "sub bar; foo bar $x"
* where the compiler doesn't know if foo is a method call or a function.
* It prints "Missing operator before end of line" if there's nothing
* after the missing operator, or "... before <...>" if there is something
* after the missing operator.
*/
STATIC void
S_no_op(pTHX_ const char *what, char *s)
{
dVAR;
char * const oldbp = PL_bufptr;
const bool is_first = (PL_oldbufptr == PL_linestart);
PERL_ARGS_ASSERT_NO_OP;
if (!s)
s = oldbp;
else
PL_bufptr = s;
yywarn(Perl_form(aTHX_ "%s found where operator expected", what));
if (ckWARN_d(WARN_SYNTAX)) {
if (is_first)
Perl_warner(aTHX_ packWARN(WARN_SYNTAX),
"\t(Missing semicolon on previous line?)\n");
else if (PL_oldoldbufptr && isIDFIRST_lazy_if(PL_oldoldbufptr,UTF)) {
const char *t;
for (t = PL_oldoldbufptr; (isALNUM_lazy_if(t,UTF) || *t == ':'); t++)
NOOP;
if (t < PL_bufptr && isSPACE(*t))
Perl_warner(aTHX_ packWARN(WARN_SYNTAX),
"\t(Do you need to predeclare %.*s?)\n",
(int)(t - PL_oldoldbufptr), PL_oldoldbufptr);
}
else {
assert(s >= oldbp);
Perl_warner(aTHX_ packWARN(WARN_SYNTAX),
"\t(Missing operator before %.*s?)\n", (int)(s - oldbp), oldbp);
}
}
PL_bufptr = oldbp;
}
/*
* S_missingterm
* Complain about missing quote/regexp/heredoc terminator.
* If it's called with NULL then it cauterizes the line buffer.
* If we're in a delimited string and the delimiter is a control
* character, it's reformatted into a two-char sequence like ^C.
* This is fatal.
*/
STATIC void
S_missingterm(pTHX_ char *s)
{
dVAR;
char tmpbuf[3];
char q;
if (s) {
char * const nl = strrchr(s,'\n');
if (nl)
*nl = '\0';
}
else if (isCNTRL(PL_multi_close)) {
*tmpbuf = '^';
tmpbuf[1] = (char)toCTRL(PL_multi_close);
tmpbuf[2] = '\0';
s = tmpbuf;
}
else {
*tmpbuf = (char)PL_multi_close;
tmpbuf[1] = '\0';
s = tmpbuf;
}
q = strchr(s,'"') ? '\'' : '"';
Perl_croak(aTHX_ "Can't find string terminator %c%s%c anywhere before EOF",q,s,q);
}
#define FEATURE_IS_ENABLED(name) \
((0 != (PL_hints & HINT_LOCALIZE_HH)) \
&& S_feature_is_enabled(aTHX_ STR_WITH_LEN(name)))
/* The longest string we pass in. */
#define MAX_FEATURE_LEN (sizeof("switch")-1)
/*
* S_feature_is_enabled
* Check whether the named feature is enabled.
*/
STATIC bool
S_feature_is_enabled(pTHX_ const char *name, STRLEN namelen)
{
dVAR;
HV * const hinthv = GvHV(PL_hintgv);
char he_name[8 + MAX_FEATURE_LEN] = "feature_";
PERL_ARGS_ASSERT_FEATURE_IS_ENABLED;
assert(namelen <= MAX_FEATURE_LEN);
memcpy(&he_name[8], name, namelen);
return (hinthv && hv_exists(hinthv, he_name, 8 + namelen));
}
/*
* Perl_deprecate
*/
void
Perl_deprecate(pTHX_ const char *s)
{
PERL_ARGS_ASSERT_DEPRECATE;
if (ckWARN(WARN_DEPRECATED))
Perl_warner(aTHX_ packWARN(WARN_DEPRECATED), "Use of %s is deprecated", s);
}
void
Perl_deprecate_old(pTHX_ const char *s)
{
/* This function should NOT be called for any new deprecated warnings */
/* Use Perl_deprecate instead */
/* */
/* It is here to maintain backward compatibility with the pre-5.8 */
/* warnings category hierarchy. The "deprecated" category used to */
/* live under the "syntax" category. It is now a top-level category */
/* in its own right. */
PERL_ARGS_ASSERT_DEPRECATE_OLD;
if (ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
"Use of %s is deprecated", s);
}
/*
* experimental text filters for win32 carriage-returns, utf16-to-utf8 and
* utf16-to-utf8-reversed.
*/
#ifdef PERL_CR_FILTER
static void
strip_return(SV *sv)
{
register const char *s = SvPVX_const(sv);
register const char * const e = s + SvCUR(sv);
PERL_ARGS_ASSERT_STRIP_RETURN;
/* outer loop optimized to do nothing if there are no CR-LFs */
while (s < e) {
if (*s++ == '\r' && *s == '\n') {
/* hit a CR-LF, need to copy the rest */
register char *d = s - 1;
*d++ = *s++;
while (s < e) {
if (*s == '\r' && s[1] == '\n')
s++;
*d++ = *s++;
}
SvCUR(sv) -= s - d;
return;
}
}
}
STATIC I32
S_cr_textfilter(pTHX_ int idx, SV *sv, int maxlen)
{
const I32 count = FILTER_READ(idx+1, sv, maxlen);
if (count > 0 && !maxlen)
strip_return(sv);
return count;
}
#endif
/*
* Perl_lex_start
*
* Create a parser object and initialise its parser and lexer fields
*
* rsfp is the opened file handle to read from (if any),
*
* line holds any initial content already read from the file (or in
* the case of no file, such as an eval, the whole contents);
*
* new_filter indicates that this is a new file and it shouldn't inherit
* the filters from the current parser (ie require).
*/
void
Perl_lex_start(pTHX_ SV *line, PerlIO *rsfp, bool new_filter)
{
dVAR;
const char *s = NULL;
STRLEN len;
yy_parser *parser, *oparser;
/* create and initialise a parser */
Newxz(parser, 1, yy_parser);
parser->old_parser = oparser = PL_parser;
PL_parser = parser;
Newx(parser->stack, YYINITDEPTH, yy_stack_frame);
parser->ps = parser->stack;
parser->stack_size = YYINITDEPTH;
parser->stack->state = 0;
parser->yyerrstatus = 0;
parser->yychar = YYEMPTY; /* Cause a token to be read. */
/* on scope exit, free this parser and restore any outer one */
SAVEPARSER(parser);
parser->saved_curcop = PL_curcop;
/* initialise lexer state */
#ifdef PERL_MAD
parser->curforce = -1;
#else
parser->nexttoke = 0;
#endif
parser->error_count = oparser ? oparser->error_count : 0;
parser->copline = NOLINE;
parser->lex_state = LEX_NORMAL;
parser->expect = XSTATE;
parser->rsfp = rsfp;
parser->rsfp_filters = (new_filter || !oparser) ? newAV()
: MUTABLE_AV(SvREFCNT_inc(oparser->rsfp_filters));
Newx(parser->lex_brackstack, 120, char);
Newx(parser->lex_casestack, 12, char);
*parser->lex_casestack = '\0';
if (line) {
s = SvPV_const(line, len);
} else {
len = 0;
}
if (!len) {
parser->linestr = newSVpvs("\n;");
} else if (SvREADONLY(line) || s[len-1] != ';') {
parser->linestr = newSVsv(line);
if (s[len-1] != ';')
sv_catpvs(parser->linestr, "\n;");
} else {
SvTEMP_off(line);
SvREFCNT_inc_simple_void_NN(line);
parser->linestr = line;
}
parser->oldoldbufptr =
parser->oldbufptr =
parser->bufptr =
parser->linestart = SvPVX(parser->linestr);
parser->bufend = parser->bufptr + SvCUR(parser->linestr);
parser->last_lop = parser->last_uni = NULL;
}
/* delete a parser object */
void
Perl_parser_free(pTHX_ const yy_parser *parser)
{
PERL_ARGS_ASSERT_PARSER_FREE;
PL_curcop = parser->saved_curcop;
SvREFCNT_dec(parser->linestr);
if (parser->rsfp == PerlIO_stdin())
PerlIO_clearerr(parser->rsfp);
else if (parser->rsfp && (!parser->old_parser ||
(parser->old_parser && parser->rsfp != parser->old_parser->rsfp)))
PerlIO_close(parser->rsfp);
SvREFCNT_dec(parser->rsfp_filters);
Safefree(parser->stack);
Safefree(parser->lex_brackstack);
Safefree(parser->lex_casestack);
PL_parser = parser->old_parser;
Safefree(parser);
}
/*
* Perl_lex_end
* Finalizer for lexing operations. Must be called when the parser is
* done with the lexer.
*/
void
Perl_lex_end(pTHX)
{
dVAR;
PL_doextract = FALSE;
}
/*
* S_incline
* This subroutine has nothing to do with tilting, whether at windmills
* or pinball tables. Its name is short for "increment line". It
* increments the current line number in CopLINE(PL_curcop) and checks
* to see whether the line starts with a comment of the form
* # line 500 "foo.pm"
* If so, it sets the current line number and file to the values in the comment.
*/
STATIC void
S_incline(pTHX_ const char *s)
{
dVAR;
const char *t;
const char *n;
const char *e;
PERL_ARGS_ASSERT_INCLINE;
CopLINE_inc(PL_curcop);
if (*s++ != '#')
return;
while (SPACE_OR_TAB(*s))
s++;
if (strnEQ(s, "line", 4))
s += 4;
else
return;
if (SPACE_OR_TAB(*s))
s++;
else
return;
while (SPACE_OR_TAB(*s))
s++;
if (!isDIGIT(*s))
return;
n = s;
while (isDIGIT(*s))
s++;
while (SPACE_OR_TAB(*s))
s++;
if (*s == '"' && (t = strchr(s+1, '"'))) {
s++;
e = t + 1;
}
else {
t = s;
while (!isSPACE(*t))
t++;
e = t;
}
while (SPACE_OR_TAB(*e) || *e == '\r' || *e == '\f')
e++;
if (*e != '\n' && *e != '\0')
return; /* false alarm */
if (t - s > 0) {
const STRLEN len = t - s;
#ifndef USE_ITHREADS
SV *const temp_sv = CopFILESV(PL_curcop);
const char *cf;
STRLEN tmplen;
if (temp_sv) {
cf = SvPVX(temp_sv);
tmplen = SvCUR(temp_sv);
} else {
cf = NULL;
tmplen = 0;
}
if (tmplen > 7 && strnEQ(cf, "(eval ", 6)) {
/* must copy *{"::_<(eval N)[oldfilename:L]"}
* to *{"::_<newfilename"} */
/* However, the long form of evals is only turned on by the
debugger - usually they're "(eval %lu)" */
char smallbuf[128];
char *tmpbuf;
GV **gvp;
STRLEN tmplen2 = len;
if (tmplen + 2 <= sizeof smallbuf)
tmpbuf = smallbuf;
else
Newx(tmpbuf, tmplen + 2, char);
tmpbuf[0] = '_';
tmpbuf[1] = '<';
memcpy(tmpbuf + 2, cf, tmplen);
tmplen += 2;
gvp = (GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, FALSE);
if (gvp) {
char *tmpbuf2;
GV *gv2;
if (tmplen2 + 2 <= sizeof smallbuf)
tmpbuf2 = smallbuf;
else
Newx(tmpbuf2, tmplen2 + 2, char);
if (tmpbuf2 != smallbuf || tmpbuf != smallbuf) {
/* Either they malloc'd it, or we malloc'd it,
so no prefix is present in ours. */
tmpbuf2[0] = '_';
tmpbuf2[1] = '<';
}
memcpy(tmpbuf2 + 2, s, tmplen2);
tmplen2 += 2;
gv2 = *(GV**)hv_fetch(PL_defstash, tmpbuf2, tmplen2, TRUE);
if (!isGV(gv2)) {
gv_init(gv2, PL_defstash, tmpbuf2, tmplen2, FALSE);
/* adjust ${"::_<newfilename"} to store the new file name */
GvSV(gv2) = newSVpvn(tmpbuf2 + 2, tmplen2 - 2);
GvHV(gv2) = MUTABLE_HV(SvREFCNT_inc(GvHV(*gvp)));
GvAV(gv2) = MUTABLE_AV(SvREFCNT_inc(GvAV(*gvp)));
}
if (tmpbuf2 != smallbuf) Safefree(tmpbuf2);
}
if (tmpbuf != smallbuf) Safefree(tmpbuf);
}
#endif
CopFILE_free(PL_curcop);
CopFILE_setn(PL_curcop, s, len);
}
CopLINE_set(PL_curcop, atoi(n)-1);
}
#ifdef PERL_MAD
/* skip space before PL_thistoken */
STATIC char *
S_skipspace0(pTHX_ register char *s)
{
PERL_ARGS_ASSERT_SKIPSPACE0;
s = skipspace(s);
if (!PL_madskills)
return s;
if (PL_skipwhite) {
if (!PL_thiswhite)
PL_thiswhite = newSVpvs("");
sv_catsv(PL_thiswhite, PL_skipwhite);
sv_free(PL_skipwhite);
PL_skipwhite = 0;
}
PL_realtokenstart = s - SvPVX(PL_linestr);
return s;
}
/* skip space after PL_thistoken */
STATIC char *
S_skipspace1(pTHX_ register char *s)
{
const char *start = s;
I32 startoff = start - SvPVX(PL_linestr);
PERL_ARGS_ASSERT_SKIPSPACE1;
s = skipspace(s);
if (!PL_madskills)
return s;
start = SvPVX(PL_linestr) + startoff;
if (!PL_thistoken && PL_realtokenstart >= 0) {
const char * const tstart = SvPVX(PL_linestr) + PL_realtokenstart;
PL_thistoken = newSVpvn(tstart, start - tstart);
}
PL_realtokenstart = -1;
if (PL_skipwhite) {
if (!PL_nextwhite)
PL_nextwhite = newSVpvs("");
sv_catsv(PL_nextwhite, PL_skipwhite);
sv_free(PL_skipwhite);
PL_skipwhite = 0;
}
return s;
}
STATIC char *
S_skipspace2(pTHX_ register char *s, SV **svp)
{
char *start;
const I32 bufptroff = PL_bufptr - SvPVX(PL_linestr);
const I32 startoff = s - SvPVX(PL_linestr);
PERL_ARGS_ASSERT_SKIPSPACE2;
s = skipspace(s);
PL_bufptr = SvPVX(PL_linestr) + bufptroff;
if (!PL_madskills || !svp)
return s;
start = SvPVX(PL_linestr) + startoff;
if (!PL_thistoken && PL_realtokenstart >= 0) {
char * const tstart = SvPVX(PL_linestr) + PL_realtokenstart;
PL_thistoken = newSVpvn(tstart, start - tstart);
PL_realtokenstart = -1;
}
if (PL_skipwhite) {
if (!*svp)
*svp = newSVpvs("");
sv_setsv(*svp, PL_skipwhite);
sv_free(PL_skipwhite);
PL_skipwhite = 0;
}
return s;
}
#endif
STATIC void
S_update_debugger_info(pTHX_ SV *orig_sv, const char *buf, STRLEN len)
{
AV *av = CopFILEAVx(PL_curcop);