X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=av.c;h=df35b1a8390494130e6db98581e08ad0e94ccd27;hb=06c0cc96ebd866767a6d107ed78967600f7e0395;hp=822f935c7bb37a57162c7b1acac1542d3d976b24;hpb=463ee0b2acbd047c27e8b5393cdd8398881824c5;p=p5sagit%2Fp5-mst-13.2.git diff --git a/av.c b/av.c index 822f935..df35b1a 100644 --- a/av.c +++ b/av.c @@ -1,373 +1,933 @@ -/* $RCSfile: array.c,v $$Revision: 4.1 $$Date: 92/08/07 17:18:22 $ +/* av.c * - * Copyright (c) 1991, Larry Wall + * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, + * 2000, 2001, 2002, 2003, 2004, 2005 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. * - * $Log: array.c,v $ - * Revision 4.1 92/08/07 17:18:22 lwall - * Stage 6 Snapshot - * - * Revision 4.0.1.3 92/06/08 11:45:05 lwall - * patch20: Perl now distinguishes overlapped copies from non-overlapped - * - * Revision 4.0.1.2 91/11/05 16:00:14 lwall - * patch11: random cleanup - * patch11: passing non-existend array elements to subrouting caused core dump - * - * Revision 4.0.1.1 91/06/07 10:19:08 lwall - * patch4: new copyright notice - * - * Revision 4.0 91/03/20 01:03:32 lwall - * 4.0 baseline. - * */ +/* + * "...for the Entwives desired order, and plenty, and peace (by which they + * meant that things should remain where they had set them)." --Treebeard + */ + +/* +=head1 Array Manipulation Functions +*/ + #include "EXTERN.h" +#define PERL_IN_AV_C #include "perl.h" -SV** -av_fetch(av,key,lval) -register AV *av; -I32 key; -I32 lval; +void +Perl_av_reify(pTHX_ AV *av) { - SV *sv; + I32 key; - if (SvMAGICAL(av)) { - if (mg_find((SV*)av,'P')) { - if (key < 0) - return 0; - sv = sv_2mortal(NEWSV(61,0)); - mg_copy((SV*)av, sv, 0, key); - if (!lval) { - mg_get((SV*)sv); - sv_unmagic(sv,'p'); - } - Sv = sv; - return &Sv; - } - } - - if (key < 0 || key > AvFILL(av)) { - if (lval && key >= 0) { - if (AvREAL(av)) - sv = NEWSV(5,0); - else - sv = sv_mortalcopy(&sv_undef); - return av_store(av,key,sv); - } - else - return 0; - } - if (!AvARRAY(av)[key]) { - if (lval) { - sv = NEWSV(6,0); - return av_store(av,key,sv); - } - return 0; + if (AvREAL(av)) + return; +#ifdef DEBUGGING + if (SvTIED_mg((SV*)av, PERL_MAGIC_tied) && ckWARN_d(WARN_DEBUGGING)) + Perl_warner(aTHX_ packWARN(WARN_DEBUGGING), "av_reify called on tied array"); +#endif + key = AvMAX(av) + 1; + while (key > AvFILLp(av) + 1) + AvARRAY(av)[--key] = &PL_sv_undef; + while (key) { + SV * const sv = AvARRAY(av)[--key]; + assert(sv); + if (sv != &PL_sv_undef) + (void)SvREFCNT_inc(sv); } - return &AvARRAY(av)[key]; + key = AvARRAY(av) - AvALLOC(av); + while (key) + AvALLOC(av)[--key] = &PL_sv_undef; + AvREIFY_off(av); + AvREAL_on(av); } -SV** -av_store(av,key,val) -register AV *av; -I32 key; -SV *val; -{ - I32 tmp; - SV** ary; +/* +=for apidoc av_extend - if (key < 0) - return 0; +Pre-extend an array. The C is the index to which the array should be +extended. - if (SvMAGICAL(av)) { - if (mg_find((SV*)av,'P')) { - mg_copy((SV*)av, val, 0, key); - return 0; - } - } +=cut +*/ +void +Perl_av_extend(pTHX_ AV *av, I32 key) +{ + MAGIC * const mg = SvTIED_mg((SV*)av, PERL_MAGIC_tied); + if (mg) { + dSP; + ENTER; + SAVETMPS; + PUSHSTACKi(PERLSI_MAGIC); + PUSHMARK(SP); + EXTEND(SP,2); + PUSHs(SvTIED_obj((SV*)av, mg)); + PUSHs(sv_2mortal(newSViv(key+1))); + PUTBACK; + call_method("EXTEND", G_SCALAR|G_DISCARD); + POPSTACK; + FREETMPS; + LEAVE; + return; + } if (key > AvMAX(av)) { + SV** ary; + I32 tmp; I32 newmax; if (AvALLOC(av) != AvARRAY(av)) { + ary = AvALLOC(av) + AvFILLp(av) + 1; tmp = AvARRAY(av) - AvALLOC(av); - Move(AvARRAY(av), AvALLOC(av), AvMAX(av)+1, SV*); - Zero(AvALLOC(av)+AvMAX(av)+1, tmp, SV*); + Move(AvARRAY(av), AvALLOC(av), AvFILLp(av)+1, SV*); AvMAX(av) += tmp; - SvPVX(av) = (char*)(AvARRAY(av) - tmp); + SvPV_set(av, (char*)AvALLOC(av)); + if (AvREAL(av)) { + while (tmp) + ary[--tmp] = &PL_sv_undef; + } if (key > AvMAX(av) - 10) { newmax = key + AvMAX(av); goto resize; } } else { +#ifdef PERL_MALLOC_WRAP + static const char oom_array_extend[] = + "Out of memory during array extend"; /* Duplicated in pp_hot.c */ +#endif + if (AvALLOC(av)) { +#if !defined(STRANGE_MALLOC) && !defined(MYMALLOC) + MEM_SIZE bytes; + IV itmp; +#endif + +#ifdef MYMALLOC + newmax = malloced_size((void*)AvALLOC(av))/sizeof(SV*) - 1; + + if (key <= newmax) + goto resized; +#endif newmax = key + AvMAX(av) / 5; resize: + MEM_WRAP_CHECK_1(newmax+1, SV*, oom_array_extend); +#if defined(STRANGE_MALLOC) || defined(MYMALLOC) Renew(AvALLOC(av),newmax+1, SV*); - Zero(&AvALLOC(av)[AvMAX(av)+1], newmax - AvMAX(av), SV*); +#else + bytes = (newmax + 1) * sizeof(SV*); +#define MALLOC_OVERHEAD 16 + itmp = MALLOC_OVERHEAD; + while ((MEM_SIZE)(itmp - MALLOC_OVERHEAD) < bytes) + itmp += itmp; + itmp -= MALLOC_OVERHEAD; + itmp /= sizeof(SV*); + assert(itmp > newmax); + newmax = itmp - 1; + assert(newmax >= AvMAX(av)); + Newx(ary, newmax+1, SV*); + Copy(AvALLOC(av), ary, AvMAX(av)+1, SV*); + if (AvMAX(av) > 64) + offer_nice_chunk(AvALLOC(av), (AvMAX(av)+1) * sizeof(SV*)); + else + Safefree(AvALLOC(av)); + AvALLOC(av) = ary; +#endif +#ifdef MYMALLOC + resized: +#endif + ary = AvALLOC(av) + AvMAX(av) + 1; + tmp = newmax - AvMAX(av); + if (av == PL_curstack) { /* Oops, grew stack (via av_store()?) */ + PL_stack_sp = AvALLOC(av) + (PL_stack_sp - PL_stack_base); + PL_stack_base = AvALLOC(av); + PL_stack_max = PL_stack_base + newmax; + } } else { - newmax = key < 4 ? 4 : key; - Newz(2,AvALLOC(av), newmax+1, SV*); + newmax = key < 3 ? 3 : key; + MEM_WRAP_CHECK_1(newmax+1, SV*, oom_array_extend); + Newx(AvALLOC(av), newmax+1, SV*); + ary = AvALLOC(av) + 1; + tmp = newmax; + AvALLOC(av)[0] = &PL_sv_undef; /* For the stacks */ + } + if (AvREAL(av)) { + while (tmp) + ary[--tmp] = &PL_sv_undef; } - SvPVX(av) = (char*)AvALLOC(av); + + SvPV_set(av, (char*)AvALLOC(av)); AvMAX(av) = newmax; } } - ary = AvARRAY(av); - if (AvREAL(av)) { - if (AvFILL(av) < key) { - while (++AvFILL(av) < key) { - if (ary[AvFILL(av)] != Nullsv) { - sv_free(ary[AvFILL(av)]); - ary[AvFILL(av)] = Nullsv; - } +} + +/* +=for apidoc av_fetch + +Returns the SV at the specified index in the array. The C is the +index. If C is set then the fetch will be part of a store. Check +that the return value is non-null before dereferencing it to a C. + +See L for +more information on how to use this function on tied arrays. + +=cut +*/ + +SV** +Perl_av_fetch(pTHX_ register AV *av, I32 key, I32 lval) +{ + SV *sv; + + if (!av) + return 0; + + if (SvRMAGICAL(av)) { + const MAGIC * const tied_magic = mg_find((SV*)av, PERL_MAGIC_tied); + if (tied_magic || mg_find((SV*)av, PERL_MAGIC_regdata)) { + U32 adjust_index = 1; + + if (tied_magic && key < 0) { + /* Handle negative array indices 20020222 MJD */ + SV * const * const negative_indices_glob = + hv_fetch(SvSTASH(SvRV(SvTIED_obj((SV *)av, + tied_magic))), + NEGATIVE_INDICES_VAR, 16, 0); + + if (negative_indices_glob + && SvTRUE(GvSV(*negative_indices_glob))) + adjust_index = 0; + } + + if (key < 0 && adjust_index) { + key += AvFILL(av) + 1; + if (key < 0) + return 0; + } + + sv = sv_newmortal(); + sv_upgrade(sv, SVt_PVLV); + mg_copy((SV*)av, sv, 0, key); + LvTYPE(sv) = 't'; + LvTARG(sv) = sv; /* fake (SV**) */ + return &(LvTARG(sv)); + } + } + + if (key < 0) { + key += AvFILL(av) + 1; + if (key < 0) + return 0; + } + + if (key > AvFILLp(av)) { + if (!lval) + return 0; + sv = NEWSV(5,0); + return av_store(av,key,sv); + } + if (AvARRAY(av)[key] == &PL_sv_undef) { + emptyness: + if (lval) { + sv = NEWSV(6,0); + return av_store(av,key,sv); + } + return 0; + } + else if (AvREIFY(av) + && (!AvARRAY(av)[key] /* eg. @_ could have freed elts */ + || SvTYPE(AvARRAY(av)[key]) == SVTYPEMASK)) { + AvARRAY(av)[key] = &PL_sv_undef; /* 1/2 reify */ + goto emptyness; + } + return &AvARRAY(av)[key]; +} + +/* +=for apidoc av_store + +Stores an SV in an array. The array index is specified as C. The +return value will be NULL if the operation failed or if the value did not +need to be actually stored within the array (as in the case of tied +arrays). Otherwise it can be dereferenced to get the original C. Note +that the caller is responsible for suitably incrementing the reference +count of C before the call, and decrementing it if the function +returned NULL. + +See L for +more information on how to use this function on tied arrays. + +=cut +*/ + +SV** +Perl_av_store(pTHX_ register AV *av, I32 key, SV *val) +{ + SV** ary; + + if (!av) + return 0; + if (!val) + val = &PL_sv_undef; + + if (SvRMAGICAL(av)) { + const MAGIC * const tied_magic = mg_find((SV*)av, PERL_MAGIC_tied); + if (tied_magic) { + /* Handle negative array indices 20020222 MJD */ + if (key < 0) { + unsigned adjust_index = 1; + SV * const * const negative_indices_glob = + hv_fetch(SvSTASH(SvRV(SvTIED_obj((SV *)av, + tied_magic))), + NEGATIVE_INDICES_VAR, 16, 0); + if (negative_indices_glob + && SvTRUE(GvSV(*negative_indices_glob))) + adjust_index = 0; + if (adjust_index) { + key += AvFILL(av) + 1; + if (key < 0) + return 0; + } + } + if (val != &PL_sv_undef) { + mg_copy((SV*)av, val, 0, key); } + return 0; + } + } + + + if (key < 0) { + key += AvFILL(av) + 1; + if (key < 0) + return 0; + } + + if (SvREADONLY(av) && key >= AvFILL(av)) + Perl_croak(aTHX_ PL_no_modify); + + if (!AvREAL(av) && AvREIFY(av)) + av_reify(av); + if (key > AvMAX(av)) + av_extend(av,key); + ary = AvARRAY(av); + if (AvFILLp(av) < key) { + if (!AvREAL(av)) { + if (av == PL_curstack && key > PL_stack_sp - PL_stack_base) + PL_stack_sp = PL_stack_base + key; /* XPUSH in disguise */ + do + ary[++AvFILLp(av)] = &PL_sv_undef; + while (AvFILLp(av) < key); } - if (ary[key]) - sv_free(ary[key]); + AvFILLp(av) = key; } + else if (AvREAL(av)) + SvREFCNT_dec(ary[key]); ary[key] = val; - if (SvMAGICAL(av)) { - MAGIC* mg = SvMAGIC(av); - sv_magic(val, (SV*)av, tolower(mg->mg_type), 0, key); + if (SvSMAGICAL(av)) { + if (val != &PL_sv_undef) { + MAGIC* mg = SvMAGIC(av); + sv_magic(val, (SV*)av, toLOWER(mg->mg_type), 0, key); + } mg_set((SV*)av); } return &ary[key]; } +/* +=for apidoc newAV + +Creates a new AV. The reference count is set to 1. + +=cut +*/ + AV * -newAV() +Perl_newAV(pTHX) { - register AV *av; + register AV * const av = (AV*)NEWSV(3,0); - Newz(1,av,1,AV); - SvREFCNT(av) = 1; - sv_upgrade(av,SVt_PVAV); - AvREAL_on(av); + sv_upgrade((SV *)av, SVt_PVAV); + /* sv_upgrade does AvREAL_only() */ AvALLOC(av) = 0; - SvPVX(av) = 0; - AvMAX(av) = AvFILL(av) = -1; + SvPV_set(av, (char*)0); + AvMAX(av) = AvFILLp(av) = -1; return av; } +/* +=for apidoc av_make + +Creates a new AV and populates it with a list of SVs. The SVs are copied +into the array, so they may be freed after the call to av_make. The new AV +will have a reference count of 1. + +=cut +*/ + AV * -av_make(size,strp) -register I32 size; -register SV **strp; +Perl_av_make(pTHX_ register I32 size, register SV **strp) { - register AV *av; - register I32 i; - register SV** ary; + register AV * const av = (AV*)NEWSV(8,0); - Newz(3,av,1,AV); - sv_upgrade(av,SVt_PVAV); - New(4,ary,size+1,SV*); - AvALLOC(av) = ary; - Zero(ary,size,SV*); - AvREAL_on(av); - SvPVX(av) = (char*)ary; - AvFILL(av) = size - 1; - AvMAX(av) = size - 1; - for (i = 0; i < size; i++) { - if (*strp) { + sv_upgrade((SV *) av,SVt_PVAV); + /* sv_upgrade does AvREAL_only() */ + if (size) { /* "defined" was returning undef for size==0 anyway. */ + register SV** ary; + register I32 i; + Newx(ary,size,SV*); + AvALLOC(av) = ary; + SvPV_set(av, (char*)ary); + AvFILLp(av) = size - 1; + AvMAX(av) = size - 1; + for (i = 0; i < size; i++) { + assert (*strp); ary[i] = NEWSV(7,0); sv_setsv(ary[i], *strp); + strp++; } - strp++; } return av; } -AV * -av_fake(size,strp) -register I32 size; -register SV **strp; -{ - register AV *av; - register SV** ary; - - Newz(3,av,1,AV); - SvREFCNT(av) = 1; - sv_upgrade(av,SVt_PVAV); - New(4,ary,size+1,SV*); - AvALLOC(av) = ary; - Copy(strp,ary,size,SV*); - AvREAL_off(av); - SvPVX(av) = (char*)ary; - AvFILL(av) = size - 1; - AvMAX(av) = size - 1; - while (size--) { - if (*strp) - SvTEMP_off(*strp); - strp++; - } - return av; -} +/* +=for apidoc av_clear + +Clears an array, making it empty. Does not free the memory used by the +array itself. + +=cut +*/ void -av_clear(av) -register AV *av; +Perl_av_clear(pTHX_ register AV *av) { register I32 key; - if (!av || !AvREAL(av) || AvMAX(av) < 0) +#ifdef DEBUGGING + if (SvREFCNT(av) == 0 && ckWARN_d(WARN_DEBUGGING)) { + Perl_warner(aTHX_ packWARN(WARN_DEBUGGING), "Attempt to clear deleted array"); + } +#endif + if (!av) + return; + + if (SvREADONLY(av)) + Perl_croak(aTHX_ PL_no_modify); + + /* Give any tie a chance to cleanup first */ + if (SvRMAGICAL(av)) + mg_clear((SV*)av); + + if (AvMAX(av) < 0) return; - /*SUPPRESS 560*/ - if (key = AvARRAY(av) - AvALLOC(av)) { + + if (AvREAL(av)) { + SV** const ary = AvARRAY(av); + key = AvFILLp(av) + 1; + while (key) { + SV * const sv = ary[--key]; + /* undef the slot before freeing the value, because a + * destructor might try to modify this arrray */ + ary[key] = &PL_sv_undef; + SvREFCNT_dec(sv); + } + } + if ((key = AvARRAY(av) - AvALLOC(av))) { AvMAX(av) += key; - SvPVX(av) = (char*)(AvARRAY(av) - key); + SvPV_set(av, (char*)AvALLOC(av)); } - for (key = 0; key <= AvMAX(av); key++) - sv_free(AvARRAY(av)[key]); - AvFILL(av) = -1; - Zero(AvARRAY(av), AvMAX(av)+1, SV*); + AvFILLp(av) = -1; + } +/* +=for apidoc av_undef + +Undefines the array. Frees the memory used by the array itself. + +=cut +*/ + void -av_undef(av) -register AV *av; +Perl_av_undef(pTHX_ register AV *av) { - register I32 key; - if (!av) return; - /*SUPPRESS 560*/ - if (key = AvARRAY(av) - AvALLOC(av)) { - AvMAX(av) += key; - SvPVX(av) = (char*)(AvARRAY(av) - key); - } + + /* Give any tie a chance to cleanup first */ + if (SvTIED_mg((SV*)av, PERL_MAGIC_tied)) + av_fill(av, -1); /* mg_clear() ? */ + if (AvREAL(av)) { - for (key = 0; key <= AvMAX(av); key++) - sv_free(AvARRAY(av)[key]); + register I32 key = AvFILLp(av) + 1; + while (key) + SvREFCNT_dec(AvARRAY(av)[--key]); } Safefree(AvALLOC(av)); AvALLOC(av) = 0; - SvPVX(av) = 0; - AvMAX(av) = AvFILL(av) = -1; + SvPV_set(av, (char*)0); + AvMAX(av) = AvFILLp(av) = -1; } +/* +=for apidoc av_push + +Pushes an SV onto the end of the array. The array will grow automatically +to accommodate the addition. + +=cut +*/ + void -av_free(av) -AV *av; -{ - av_undef(av); - Safefree(av); -} +Perl_av_push(pTHX_ register AV *av, SV *val) +{ + dVAR; + MAGIC *mg; + if (!av) + return; + if (SvREADONLY(av)) + Perl_croak(aTHX_ PL_no_modify); -bool -av_push(av,val) -register AV *av; -SV *val; -{ - return av_store(av,++(AvFILL(av)),val) != 0; + if ((mg = SvTIED_mg((SV*)av, PERL_MAGIC_tied))) { + dSP; + PUSHSTACKi(PERLSI_MAGIC); + PUSHMARK(SP); + EXTEND(SP,2); + PUSHs(SvTIED_obj((SV*)av, mg)); + PUSHs(val); + PUTBACK; + ENTER; + call_method("PUSH", G_SCALAR|G_DISCARD); + LEAVE; + POPSTACK; + return; + } + av_store(av,AvFILLp(av)+1,val); } +/* +=for apidoc av_pop + +Pops an SV off the end of the array. Returns C<&PL_sv_undef> if the array +is empty. + +=cut +*/ + SV * -av_pop(av) -register AV *av; +Perl_av_pop(pTHX_ register AV *av) { + dVAR; SV *retval; + MAGIC* mg; + if (!av) + return &PL_sv_undef; + if (SvREADONLY(av)) + Perl_croak(aTHX_ PL_no_modify); + if ((mg = SvTIED_mg((SV*)av, PERL_MAGIC_tied))) { + dSP; + PUSHSTACKi(PERLSI_MAGIC); + PUSHMARK(SP); + XPUSHs(SvTIED_obj((SV*)av, mg)); + PUTBACK; + ENTER; + if (call_method("POP", G_SCALAR)) { + retval = newSVsv(*PL_stack_sp--); + } else { + retval = &PL_sv_undef; + } + LEAVE; + POPSTACK; + return retval; + } if (AvFILL(av) < 0) - return Nullsv; - retval = AvARRAY(av)[AvFILL(av)]; - AvARRAY(av)[AvFILL(av)--] = Nullsv; - if (SvMAGICAL(av)) + return &PL_sv_undef; + retval = AvARRAY(av)[AvFILLp(av)]; + AvARRAY(av)[AvFILLp(av)--] = &PL_sv_undef; + if (SvSMAGICAL(av)) mg_set((SV*)av); return retval; } -void -av_popnulls(av) -register AV *av; -{ - register I32 fill = AvFILL(av); +/* +=for apidoc av_unshift - while (fill >= 0 && !AvARRAY(av)[fill]) - fill--; - AvFILL(av) = fill; -} +Unshift the given number of C values onto the beginning of the +array. The array will grow automatically to accommodate the addition. You +must then use C to assign values to these new elements. + +=cut +*/ void -av_unshift(av,num) -register AV *av; -register I32 num; +Perl_av_unshift(pTHX_ register AV *av, register I32 num) { + dVAR; register I32 i; - register SV **sstr,**dstr; + MAGIC* mg; - if (num <= 0) + if (!av) return; - if (AvARRAY(av) - AvALLOC(av) >= num) { - AvMAX(av) += num; - AvFILL(av) += num; - while (num--) { - SvPVX(av) = (char*)(AvARRAY(av) - 1); - *AvARRAY(av) = Nullsv; + if (SvREADONLY(av)) + Perl_croak(aTHX_ PL_no_modify); + + if ((mg = SvTIED_mg((SV*)av, PERL_MAGIC_tied))) { + dSP; + PUSHSTACKi(PERLSI_MAGIC); + PUSHMARK(SP); + EXTEND(SP,1+num); + PUSHs(SvTIED_obj((SV*)av, mg)); + while (num-- > 0) { + PUSHs(&PL_sv_undef); } + PUTBACK; + ENTER; + call_method("UNSHIFT", G_SCALAR|G_DISCARD); + LEAVE; + POPSTACK; + return; } - else { - (void)av_store(av,AvFILL(av)+num,(SV*)0); /* maybe extend array */ - dstr = AvARRAY(av) + AvFILL(av); - sstr = dstr - num; -#ifdef BUGGY_MSC5 - # pragma loop_opt(off) /* don't loop-optimize the following code */ -#endif /* BUGGY_MSC5 */ - for (i = AvFILL(av) - num; i >= 0; i--) { - *dstr-- = *sstr--; -#ifdef BUGGY_MSC5 - # pragma loop_opt() /* loop-optimization back to command-line setting */ -#endif /* BUGGY_MSC5 */ - } - Zero(AvARRAY(av), num, SV*); + + if (num <= 0) + return; + if (!AvREAL(av) && AvREIFY(av)) + av_reify(av); + i = AvARRAY(av) - AvALLOC(av); + if (i) { + if (i > num) + i = num; + num -= i; + + AvMAX(av) += i; + AvFILLp(av) += i; + SvPV_set(av, (char*)(AvARRAY(av) - i)); + } + if (num) { + register SV **ary; + I32 slide; + i = AvFILLp(av); + /* Create extra elements */ + slide = i > 0 ? i : 0; + num += slide; + av_extend(av, i + num); + AvFILLp(av) += num; + ary = AvARRAY(av); + Move(ary, ary + num, i + 1, SV*); + do { + ary[--num] = &PL_sv_undef; + } while (num); + /* Make extra elements into a buffer */ + AvMAX(av) -= slide; + AvFILLp(av) -= slide; + SvPV_set(av, (char*)(AvARRAY(av) + slide)); } } +/* +=for apidoc av_shift + +Shifts an SV off the beginning of the array. + +=cut +*/ + SV * -av_shift(av) -register AV *av; +Perl_av_shift(pTHX_ register AV *av) { + dVAR; SV *retval; + MAGIC* mg; + if (!av) + return &PL_sv_undef; + if (SvREADONLY(av)) + Perl_croak(aTHX_ PL_no_modify); + if ((mg = SvTIED_mg((SV*)av, PERL_MAGIC_tied))) { + dSP; + PUSHSTACKi(PERLSI_MAGIC); + PUSHMARK(SP); + XPUSHs(SvTIED_obj((SV*)av, mg)); + PUTBACK; + ENTER; + if (call_method("SHIFT", G_SCALAR)) { + retval = newSVsv(*PL_stack_sp--); + } else { + retval = &PL_sv_undef; + } + LEAVE; + POPSTACK; + return retval; + } if (AvFILL(av) < 0) - return Nullsv; + return &PL_sv_undef; retval = *AvARRAY(av); - *AvARRAY(av) = Nullsv; - SvPVX(av) = (char*)(AvARRAY(av) + 1); + if (AvREAL(av)) + *AvARRAY(av) = &PL_sv_undef; + SvPV_set(av, (char*)(AvARRAY(av) + 1)); AvMAX(av)--; - AvFILL(av)--; - if (SvMAGICAL(av)) + AvFILLp(av)--; + if (SvSMAGICAL(av)) mg_set((SV*)av); return retval; } +/* +=for apidoc av_len + +Returns the highest index in the array. Returns -1 if the array is +empty. + +=cut +*/ + I32 -av_len(av) -register AV *av; +Perl_av_len(pTHX_ register const AV *av) { return AvFILL(av); } +/* +=for apidoc av_fill + +Ensure than an array has a given number of elements, equivalent to +Perl's C<$#array = $fill;>. + +=cut +*/ void -av_fill(av, fill) -register AV *av; -I32 fill; +Perl_av_fill(pTHX_ register AV *av, I32 fill) { + dVAR; + MAGIC *mg; + if (!av) + Perl_croak(aTHX_ "panic: null array"); if (fill < 0) fill = -1; + if ((mg = SvTIED_mg((SV*)av, PERL_MAGIC_tied))) { + dSP; + ENTER; + SAVETMPS; + PUSHSTACKi(PERLSI_MAGIC); + PUSHMARK(SP); + EXTEND(SP,2); + PUSHs(SvTIED_obj((SV*)av, mg)); + PUSHs(sv_2mortal(newSViv(fill+1))); + PUTBACK; + call_method("STORESIZE", G_SCALAR|G_DISCARD); + POPSTACK; + FREETMPS; + LEAVE; + return; + } if (fill <= AvMAX(av)) { - AvFILL(av) = fill; - if (SvMAGICAL(av)) + I32 key = AvFILLp(av); + SV** ary = AvARRAY(av); + + if (AvREAL(av)) { + while (key > fill) { + SvREFCNT_dec(ary[key]); + ary[key--] = &PL_sv_undef; + } + } + else { + while (key < fill) + ary[++key] = &PL_sv_undef; + } + + AvFILLp(av) = fill; + if (SvSMAGICAL(av)) mg_set((SV*)av); } + else + (void)av_store(av,fill,&PL_sv_undef); +} + +/* +=for apidoc av_delete + +Deletes the element indexed by C from the array. Returns the +deleted element. If C equals C, the element is freed +and null is returned. + +=cut +*/ +SV * +Perl_av_delete(pTHX_ AV *av, I32 key, I32 flags) +{ + SV *sv; + + if (!av) + return Nullsv; + if (SvREADONLY(av)) + Perl_croak(aTHX_ PL_no_modify); + + if (SvRMAGICAL(av)) { + const MAGIC * const tied_magic = mg_find((SV*)av, PERL_MAGIC_tied); + if ((tied_magic || mg_find((SV*)av, PERL_MAGIC_regdata))) { + /* Handle negative array indices 20020222 MJD */ + SV **svp; + if (key < 0) { + unsigned adjust_index = 1; + if (tied_magic) { + SV * const * const negative_indices_glob = + hv_fetch(SvSTASH(SvRV(SvTIED_obj((SV *)av, + tied_magic))), + NEGATIVE_INDICES_VAR, 16, 0); + if (negative_indices_glob + && SvTRUE(GvSV(*negative_indices_glob))) + adjust_index = 0; + } + if (adjust_index) { + key += AvFILL(av) + 1; + if (key < 0) + return Nullsv; + } + } + svp = av_fetch(av, key, TRUE); + if (svp) { + sv = *svp; + mg_clear(sv); + if (mg_find(sv, PERL_MAGIC_tiedelem)) { + sv_unmagic(sv, PERL_MAGIC_tiedelem); /* No longer an element */ + return sv; + } + return Nullsv; + } + } + } + + if (key < 0) { + key += AvFILL(av) + 1; + if (key < 0) + return Nullsv; + } + + if (key > AvFILLp(av)) + return Nullsv; else { - AvFILL(av) = fill - 1; /* don't clobber in-between values */ - (void)av_store(av,fill,Nullsv); + if (!AvREAL(av) && AvREIFY(av)) + av_reify(av); + sv = AvARRAY(av)[key]; + if (key == AvFILLp(av)) { + AvARRAY(av)[key] = &PL_sv_undef; + do { + AvFILLp(av)--; + } while (--key >= 0 && AvARRAY(av)[key] == &PL_sv_undef); + } + else + AvARRAY(av)[key] = &PL_sv_undef; + if (SvSMAGICAL(av)) + mg_set((SV*)av); } + if (flags & G_DISCARD) { + SvREFCNT_dec(sv); + sv = Nullsv; + } + else if (AvREAL(av)) + sv = sv_2mortal(sv); + return sv; } + +/* +=for apidoc av_exists + +Returns true if the element indexed by C has been initialized. + +This relies on the fact that uninitialized array elements are set to +C<&PL_sv_undef>. + +=cut +*/ +bool +Perl_av_exists(pTHX_ AV *av, I32 key) +{ + if (!av) + return FALSE; + + + if (SvRMAGICAL(av)) { + const MAGIC * const tied_magic = mg_find((SV*)av, PERL_MAGIC_tied); + if (tied_magic || mg_find((SV*)av, PERL_MAGIC_regdata)) { + SV *sv = sv_newmortal(); + MAGIC *mg; + /* Handle negative array indices 20020222 MJD */ + if (key < 0) { + unsigned adjust_index = 1; + if (tied_magic) { + SV * const * const negative_indices_glob = + hv_fetch(SvSTASH(SvRV(SvTIED_obj((SV *)av, + tied_magic))), + NEGATIVE_INDICES_VAR, 16, 0); + if (negative_indices_glob + && SvTRUE(GvSV(*negative_indices_glob))) + adjust_index = 0; + } + if (adjust_index) { + key += AvFILL(av) + 1; + if (key < 0) + return FALSE; + } + } + + mg_copy((SV*)av, sv, 0, key); + mg = mg_find(sv, PERL_MAGIC_tiedelem); + if (mg) { + magic_existspack(sv, mg); + return (bool)SvTRUE(sv); + } + + } + } + + if (key < 0) { + key += AvFILL(av) + 1; + if (key < 0) + return FALSE; + } + + if (key <= AvFILLp(av) && AvARRAY(av)[key] != &PL_sv_undef + && AvARRAY(av)[key]) + { + return TRUE; + } + else + return FALSE; +} + +SV ** +Perl_av_arylen_p(pTHX_ AV *av) { + dVAR; + MAGIC *mg = mg_find((SV*)av, PERL_MAGIC_arylen_p); + + if (!mg) { + mg = sv_magicext((SV*)av, 0, PERL_MAGIC_arylen_p, &PL_vtbl_arylen_p, + 0, 0); + + if (!mg) { + Perl_die(aTHX_ "panic: av_arylen_p"); + } + /* sv_magicext won't set this for us because we pass in a NULL obj */ + mg->mg_flags |= MGf_REFCOUNTED; + } + return &(mg->mg_obj); +} + +/* + * Local variables: + * c-indentation-style: bsd + * c-basic-offset: 4 + * indent-tabs-mode: t + * End: + * + * ex: set ts=8 sts=4 sw=4 noet: + */