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freebsd-src/contrib/perl5/pp_ctl.c

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/* pp_ctl.c
*
* Copyright (c) 1991-1999, Larry Wall
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
*
*/
/*
* Now far ahead the Road has gone,
* And I must follow, if I can,
* Pursuing it with eager feet,
* Until it joins some larger way
* Where many paths and errands meet.
* And whither then? I cannot say.
*/
#include "EXTERN.h"
#include "perl.h"
#ifndef WORD_ALIGN
#define WORD_ALIGN sizeof(U16)
#endif
#define DOCATCH(o) ((CATCH_GET == TRUE) ? docatch(o) : (o))
#ifdef PERL_OBJECT
#define CALLOP this->*PL_op
#else
#define CALLOP *PL_op
static OP *docatch _((OP *o));
static OP *dofindlabel _((OP *o, char *label, OP **opstack, OP **oplimit));
static void doparseform _((SV *sv));
static I32 dopoptoeval _((I32 startingblock));
static I32 dopoptolabel _((char *label));
static I32 dopoptoloop _((I32 startingblock));
static I32 dopoptosub _((I32 startingblock));
static I32 dopoptosub_at _((PERL_CONTEXT *cxstk, I32 startingblock));
static void save_lines _((AV *array, SV *sv));
static I32 sortcv _((SV *a, SV *b));
static void qsortsv _((SV **array, size_t num_elts, I32 (*fun)(SV *a, SV *b)));
static OP *doeval _((int gimme, OP** startop));
#endif
PP(pp_wantarray)
{
djSP;
I32 cxix;
EXTEND(SP, 1);
cxix = dopoptosub(cxstack_ix);
if (cxix < 0)
RETPUSHUNDEF;
switch (cxstack[cxix].blk_gimme) {
case G_ARRAY:
RETPUSHYES;
case G_SCALAR:
RETPUSHNO;
default:
RETPUSHUNDEF;
}
}
PP(pp_regcmaybe)
{
return NORMAL;
}
PP(pp_regcreset)
{
/* XXXX Should store the old value to allow for tie/overload - and
restore in regcomp, where marked with XXXX. */
PL_reginterp_cnt = 0;
return NORMAL;
}
PP(pp_regcomp)
{
djSP;
register PMOP *pm = (PMOP*)cLOGOP->op_other;
register char *t;
SV *tmpstr;
STRLEN len;
MAGIC *mg = Null(MAGIC*);
tmpstr = POPs;
if (SvROK(tmpstr)) {
SV *sv = SvRV(tmpstr);
if(SvMAGICAL(sv))
mg = mg_find(sv, 'r');
}
if (mg) {
regexp *re = (regexp *)mg->mg_obj;
ReREFCNT_dec(pm->op_pmregexp);
pm->op_pmregexp = ReREFCNT_inc(re);
}
else {
t = SvPV(tmpstr, len);
/* Check against the last compiled regexp. */
if (!pm->op_pmregexp || !pm->op_pmregexp->precomp ||
pm->op_pmregexp->prelen != len ||
memNE(pm->op_pmregexp->precomp, t, len))
{
if (pm->op_pmregexp) {
ReREFCNT_dec(pm->op_pmregexp);
pm->op_pmregexp = Null(REGEXP*); /* crucial if regcomp aborts */
}
if (PL_op->op_flags & OPf_SPECIAL)
PL_reginterp_cnt = I32_MAX; /* Mark as safe. */
pm->op_pmflags = pm->op_pmpermflags; /* reset case sensitivity */
pm->op_pmregexp = CALLREGCOMP(t, t + len, pm);
PL_reginterp_cnt = 0; /* XXXX Be extra paranoid - needed
inside tie/overload accessors. */
}
}
#ifndef INCOMPLETE_TAINTS
if (PL_tainting) {
if (PL_tainted)
pm->op_pmdynflags |= PMdf_TAINTED;
else
pm->op_pmdynflags &= ~PMdf_TAINTED;
}
#endif
if (!pm->op_pmregexp->prelen && PL_curpm)
pm = PL_curpm;
else if (strEQ("\\s+", pm->op_pmregexp->precomp))
pm->op_pmflags |= PMf_WHITE;
if (pm->op_pmflags & PMf_KEEP) {
pm->op_private &= ~OPpRUNTIME; /* no point compiling again */
cLOGOP->op_first->op_next = PL_op->op_next;
}
RETURN;
}
PP(pp_substcont)
{
djSP;
register PMOP *pm = (PMOP*) cLOGOP->op_other;
register PERL_CONTEXT *cx = &cxstack[cxstack_ix];
register SV *dstr = cx->sb_dstr;
register char *s = cx->sb_s;
register char *m = cx->sb_m;
char *orig = cx->sb_orig;
register REGEXP *rx = cx->sb_rx;
rxres_restore(&cx->sb_rxres, rx);
if (cx->sb_iters++) {
if (cx->sb_iters > cx->sb_maxiters)
DIE("Substitution loop");
if (!(cx->sb_rxtainted & 2) && SvTAINTED(TOPs))
cx->sb_rxtainted |= 2;
sv_catsv(dstr, POPs);
/* Are we done */
if (cx->sb_once || !CALLREGEXEC(rx, s, cx->sb_strend, orig,
s == m, Nullsv, NULL,
cx->sb_safebase ? 0 : REXEC_COPY_STR))
{
SV *targ = cx->sb_targ;
sv_catpvn(dstr, s, cx->sb_strend - s);
cx->sb_rxtainted |= RX_MATCH_TAINTED(rx);
(void)SvOOK_off(targ);
Safefree(SvPVX(targ));
SvPVX(targ) = SvPVX(dstr);
SvCUR_set(targ, SvCUR(dstr));
SvLEN_set(targ, SvLEN(dstr));
SvPVX(dstr) = 0;
sv_free(dstr);
TAINT_IF(cx->sb_rxtainted & 1);
PUSHs(sv_2mortal(newSViv((I32)cx->sb_iters - 1)));
(void)SvPOK_only(targ);
TAINT_IF(cx->sb_rxtainted);
SvSETMAGIC(targ);
SvTAINT(targ);
LEAVE_SCOPE(cx->sb_oldsave);
POPSUBST(cx);
RETURNOP(pm->op_next);
}
}
if (rx->subbase && rx->subbase != orig) {
m = s;
s = orig;
cx->sb_orig = orig = rx->subbase;
s = orig + (m - s);
cx->sb_strend = s + (cx->sb_strend - m);
}
cx->sb_m = m = rx->startp[0];
sv_catpvn(dstr, s, m-s);
cx->sb_s = rx->endp[0];
cx->sb_rxtainted |= RX_MATCH_TAINTED(rx);
rxres_save(&cx->sb_rxres, rx);
RETURNOP(pm->op_pmreplstart);
}
void
rxres_save(void **rsp, REGEXP *rx)
{
UV *p = (UV*)*rsp;
U32 i;
if (!p || p[1] < rx->nparens) {
i = 6 + rx->nparens * 2;
if (!p)
New(501, p, i, UV);
else
Renew(p, i, UV);
*rsp = (void*)p;
}
*p++ = (UV)rx->subbase;
rx->subbase = Nullch;
*p++ = rx->nparens;
*p++ = (UV)rx->subbeg;
*p++ = (UV)rx->subend;
for (i = 0; i <= rx->nparens; ++i) {
*p++ = (UV)rx->startp[i];
*p++ = (UV)rx->endp[i];
}
}
void
rxres_restore(void **rsp, REGEXP *rx)
{
UV *p = (UV*)*rsp;
U32 i;
Safefree(rx->subbase);
rx->subbase = (char*)(*p);
*p++ = 0;
rx->nparens = *p++;
rx->subbeg = (char*)(*p++);
rx->subend = (char*)(*p++);
for (i = 0; i <= rx->nparens; ++i) {
rx->startp[i] = (char*)(*p++);
rx->endp[i] = (char*)(*p++);
}
}
void
rxres_free(void **rsp)
{
UV *p = (UV*)*rsp;
if (p) {
Safefree((char*)(*p));
Safefree(p);
*rsp = Null(void*);
}
}
PP(pp_formline)
{
djSP; dMARK; dORIGMARK;
register SV *tmpForm = *++MARK;
register U16 *fpc;
register char *t;
register char *f;
register char *s;
register char *send;
register I32 arg;
register SV *sv;
char *item;
I32 itemsize;
I32 fieldsize;
I32 lines = 0;
bool chopspace = (strchr(PL_chopset, ' ') != Nullch);
char *chophere;
char *linemark;
double value;
bool gotsome;
STRLEN len;
if (!SvMAGICAL(tmpForm) || !SvCOMPILED(tmpForm)) {
SvREADONLY_off(tmpForm);
doparseform(tmpForm);
}
SvPV_force(PL_formtarget, len);
t = SvGROW(PL_formtarget, len + SvCUR(tmpForm) + 1); /* XXX SvCUR bad */
t += len;
f = SvPV(tmpForm, len);
/* need to jump to the next word */
s = f + len + WORD_ALIGN - SvCUR(tmpForm) % WORD_ALIGN;
fpc = (U16*)s;
for (;;) {
DEBUG_f( {
char *name = "???";
arg = -1;
switch (*fpc) {
case FF_LITERAL: arg = fpc[1]; name = "LITERAL"; break;
case FF_BLANK: arg = fpc[1]; name = "BLANK"; break;
case FF_SKIP: arg = fpc[1]; name = "SKIP"; break;
case FF_FETCH: arg = fpc[1]; name = "FETCH"; break;
case FF_DECIMAL: arg = fpc[1]; name = "DECIMAL"; break;
case FF_CHECKNL: name = "CHECKNL"; break;
case FF_CHECKCHOP: name = "CHECKCHOP"; break;
case FF_SPACE: name = "SPACE"; break;
case FF_HALFSPACE: name = "HALFSPACE"; break;
case FF_ITEM: name = "ITEM"; break;
case FF_CHOP: name = "CHOP"; break;
case FF_LINEGLOB: name = "LINEGLOB"; break;
case FF_NEWLINE: name = "NEWLINE"; break;
case FF_MORE: name = "MORE"; break;
case FF_LINEMARK: name = "LINEMARK"; break;
case FF_END: name = "END"; break;
}
if (arg >= 0)
PerlIO_printf(PerlIO_stderr(), "%-16s%ld\n", name, (long) arg);
else
PerlIO_printf(PerlIO_stderr(), "%-16s\n", name);
} )
switch (*fpc++) {
case FF_LINEMARK:
linemark = t;
lines++;
gotsome = FALSE;
break;
case FF_LITERAL:
arg = *fpc++;
while (arg--)
*t++ = *f++;
break;
case FF_SKIP:
f += *fpc++;
break;
case FF_FETCH:
arg = *fpc++;
f += arg;
fieldsize = arg;
if (MARK < SP)
sv = *++MARK;
else {
sv = &PL_sv_no;
if (PL_dowarn)
warn("Not enough format arguments");
}
break;
case FF_CHECKNL:
item = s = SvPV(sv, len);
itemsize = len;
if (itemsize > fieldsize)
itemsize = fieldsize;
send = chophere = s + itemsize;
while (s < send) {
if (*s & ~31)
gotsome = TRUE;
else if (*s == '\n')
break;
s++;
}
itemsize = s - item;
break;
case FF_CHECKCHOP:
item = s = SvPV(sv, len);
itemsize = len;
if (itemsize <= fieldsize) {
send = chophere = s + itemsize;
while (s < send) {
if (*s == '\r') {
itemsize = s - item;
break;
}
if (*s++ & ~31)
gotsome = TRUE;
}
}
else {
itemsize = fieldsize;
send = chophere = s + itemsize;
while (s < send || (s == send && isSPACE(*s))) {
if (isSPACE(*s)) {
if (chopspace)
chophere = s;
if (*s == '\r')
break;
}
else {
if (*s & ~31)
gotsome = TRUE;
if (strchr(PL_chopset, *s))
chophere = s + 1;
}
s++;
}
itemsize = chophere - item;
}
break;
case FF_SPACE:
arg = fieldsize - itemsize;
if (arg) {
fieldsize -= arg;
while (arg-- > 0)
*t++ = ' ';
}
break;
case FF_HALFSPACE:
arg = fieldsize - itemsize;
if (arg) {
arg /= 2;
fieldsize -= arg;
while (arg-- > 0)
*t++ = ' ';
}
break;
case FF_ITEM:
arg = itemsize;
s = item;
while (arg--) {
#ifdef EBCDIC
int ch = *t++ = *s++;
if (iscntrl(ch))
#else
if ( !((*t++ = *s++) & ~31) )
#endif
t[-1] = ' ';
}
break;
case FF_CHOP:
s = chophere;
if (chopspace) {
while (*s && isSPACE(*s))
s++;
}
sv_chop(sv,s);
break;
case FF_LINEGLOB:
item = s = SvPV(sv, len);
itemsize = len;
if (itemsize) {
gotsome = TRUE;
send = s + itemsize;
while (s < send) {
if (*s++ == '\n') {
if (s == send)
itemsize--;
else
lines++;
}
}
SvCUR_set(PL_formtarget, t - SvPVX(PL_formtarget));
sv_catpvn(PL_formtarget, item, itemsize);
SvGROW(PL_formtarget, SvCUR(PL_formtarget) + SvCUR(tmpForm) + 1);
t = SvPVX(PL_formtarget) + SvCUR(PL_formtarget);
}
break;
case FF_DECIMAL:
/* If the field is marked with ^ and the value is undefined,
blank it out. */
arg = *fpc++;
if ((arg & 512) && !SvOK(sv)) {
arg = fieldsize;
while (arg--)
*t++ = ' ';
break;
}
gotsome = TRUE;
value = SvNV(sv);
/* Formats aren't yet marked for locales, so assume "yes". */
SET_NUMERIC_LOCAL();
if (arg & 256) {
sprintf(t, "%#*.*f", (int) fieldsize, (int) arg & 255, value);
} else {
sprintf(t, "%*.0f", (int) fieldsize, value);
}
t += fieldsize;
break;
case FF_NEWLINE:
f++;
while (t-- > linemark && *t == ' ') ;
t++;
*t++ = '\n';
break;
case FF_BLANK:
arg = *fpc++;
if (gotsome) {
if (arg) { /* repeat until fields exhausted? */
*t = '\0';
SvCUR_set(PL_formtarget, t - SvPVX(PL_formtarget));
lines += FmLINES(PL_formtarget);
if (lines == 200) {
arg = t - linemark;
if (strnEQ(linemark, linemark - arg, arg))
DIE("Runaway format");
}
FmLINES(PL_formtarget) = lines;
SP = ORIGMARK;
RETURNOP(cLISTOP->op_first);
}
}
else {
t = linemark;
lines--;
}
break;
case FF_MORE:
s = chophere;
send = item + len;
if (chopspace) {
while (*s && isSPACE(*s) && s < send)
s++;
}
if (s < send) {
arg = fieldsize - itemsize;
if (arg) {
fieldsize -= arg;
while (arg-- > 0)
*t++ = ' ';
}
s = t - 3;
if (strnEQ(s," ",3)) {
while (s > SvPVX(PL_formtarget) && isSPACE(s[-1]))
s--;
}
*s++ = '.';
*s++ = '.';
*s++ = '.';
}
break;
case FF_END:
*t = '\0';
SvCUR_set(PL_formtarget, t - SvPVX(PL_formtarget));
FmLINES(PL_formtarget) += lines;
SP = ORIGMARK;
RETPUSHYES;
}
}
}
PP(pp_grepstart)
{
djSP;
SV *src;
if (PL_stack_base + *PL_markstack_ptr == SP) {
(void)POPMARK;
if (GIMME_V == G_SCALAR)
XPUSHs(&PL_sv_no);
RETURNOP(PL_op->op_next->op_next);
}
PL_stack_sp = PL_stack_base + *PL_markstack_ptr + 1;
pp_pushmark(ARGS); /* push dst */
pp_pushmark(ARGS); /* push src */
ENTER; /* enter outer scope */
SAVETMPS;
#ifdef USE_THREADS
/* SAVE_DEFSV does *not* suffice here */
save_sptr(&THREADSV(0));
#else
SAVESPTR(GvSV(PL_defgv));
#endif /* USE_THREADS */
ENTER; /* enter inner scope */
SAVESPTR(PL_curpm);
src = PL_stack_base[*PL_markstack_ptr];
SvTEMP_off(src);
DEFSV = src;
PUTBACK;
if (PL_op->op_type == OP_MAPSTART)
pp_pushmark(ARGS); /* push top */
return ((LOGOP*)PL_op->op_next)->op_other;
}
PP(pp_mapstart)
{
DIE("panic: mapstart"); /* uses grepstart */
}
PP(pp_mapwhile)
{
djSP;
I32 diff = (SP - PL_stack_base) - *PL_markstack_ptr;
I32 count;
I32 shift;
SV** src;
SV** dst;
++PL_markstack_ptr[-1];
if (diff) {
if (diff > PL_markstack_ptr[-1] - PL_markstack_ptr[-2]) {
shift = diff - (PL_markstack_ptr[-1] - PL_markstack_ptr[-2]);
count = (SP - PL_stack_base) - PL_markstack_ptr[-1] + 2;
EXTEND(SP,shift);
src = SP;
dst = (SP += shift);
PL_markstack_ptr[-1] += shift;
*PL_markstack_ptr += shift;
while (--count)
*dst-- = *src--;
}
dst = PL_stack_base + (PL_markstack_ptr[-2] += diff) - 1;
++diff;
while (--diff)
*dst-- = SvTEMP(TOPs) ? POPs : sv_mortalcopy(POPs);
}
LEAVE; /* exit inner scope */
/* All done yet? */
if (PL_markstack_ptr[-1] > *PL_markstack_ptr) {
I32 items;
I32 gimme = GIMME_V;
(void)POPMARK; /* pop top */
LEAVE; /* exit outer scope */
(void)POPMARK; /* pop src */
items = --*PL_markstack_ptr - PL_markstack_ptr[-1];
(void)POPMARK; /* pop dst */
SP = PL_stack_base + POPMARK; /* pop original mark */
if (gimme == G_SCALAR) {
dTARGET;
XPUSHi(items);
}
else if (gimme == G_ARRAY)
SP += items;
RETURN;
}
else {
SV *src;
ENTER; /* enter inner scope */
SAVESPTR(PL_curpm);
src = PL_stack_base[PL_markstack_ptr[-1]];
SvTEMP_off(src);
DEFSV = src;
RETURNOP(cLOGOP->op_other);
}
}
#define tryCALL_AMAGICbin(left,right,meth,svp) STMT_START { \
*svp = Nullsv; \
if (PL_amagic_generation) { \
if (SvAMAGIC(left)||SvAMAGIC(right))\
*svp = amagic_call(left, \
right, \
CAT2(meth,_amg), \
0); \
} \
} STMT_END
STATIC I32
amagic_cmp(register SV *str1, register SV *str2)
{
SV *tmpsv;
tryCALL_AMAGICbin(str1,str2,scmp,&tmpsv);
if (tmpsv) {
double d;
if (SvIOK(tmpsv)) {
I32 i = SvIVX(tmpsv);
if (i > 0)
return 1;
return i? -1 : 0;
}
d = SvNV(tmpsv);
if (d > 0)
return 1;
return d? -1 : 0;
}
return sv_cmp(str1, str2);
}
STATIC I32
amagic_cmp_locale(register SV *str1, register SV *str2)
{
SV *tmpsv;
tryCALL_AMAGICbin(str1,str2,scmp,&tmpsv);
if (tmpsv) {
double d;
if (SvIOK(tmpsv)) {
I32 i = SvIVX(tmpsv);
if (i > 0)
return 1;
return i? -1 : 0;
}
d = SvNV(tmpsv);
if (d > 0)
return 1;
return d? -1 : 0;
}
return sv_cmp_locale(str1, str2);
}
PP(pp_sort)
{
djSP; dMARK; dORIGMARK;
register SV **up;
SV **myorigmark = ORIGMARK;
register I32 max;
HV *stash;
GV *gv;
CV *cv;
I32 gimme = GIMME;
OP* nextop = PL_op->op_next;
I32 overloading = 0;
if (gimme != G_ARRAY) {
SP = MARK;
RETPUSHUNDEF;
}
ENTER;
SAVEPPTR(PL_sortcop);
if (PL_op->op_flags & OPf_STACKED) {
if (PL_op->op_flags & OPf_SPECIAL) {
OP *kid = cLISTOP->op_first->op_sibling; /* pass pushmark */
kid = kUNOP->op_first; /* pass rv2gv */
kid = kUNOP->op_first; /* pass leave */
PL_sortcop = kid->op_next;
stash = PL_curcop->cop_stash;
}
else {
cv = sv_2cv(*++MARK, &stash, &gv, 0);
if (!(cv && CvROOT(cv))) {
if (gv) {
SV *tmpstr = sv_newmortal();
gv_efullname3(tmpstr, gv, Nullch);
if (cv && CvXSUB(cv))
DIE("Xsub \"%s\" called in sort", SvPVX(tmpstr));
DIE("Undefined sort subroutine \"%s\" called",
SvPVX(tmpstr));
}
if (cv) {
if (CvXSUB(cv))
DIE("Xsub called in sort");
DIE("Undefined subroutine in sort");
}
DIE("Not a CODE reference in sort");
}
PL_sortcop = CvSTART(cv);
SAVESPTR(CvROOT(cv)->op_ppaddr);
CvROOT(cv)->op_ppaddr = ppaddr[OP_NULL];
SAVESPTR(PL_curpad);
PL_curpad = AvARRAY((AV*)AvARRAY(CvPADLIST(cv))[1]);
}
}
else {
PL_sortcop = Nullop;
stash = PL_curcop->cop_stash;
}
up = myorigmark + 1;
while (MARK < SP) { /* This may or may not shift down one here. */
/*SUPPRESS 560*/
if (*up = *++MARK) { /* Weed out nulls. */
SvTEMP_off(*up);
if (!PL_sortcop && !SvPOK(*up)) {
if (SvAMAGIC(*up))
overloading = 1;
else {
STRLEN n_a;
(void)sv_2pv(*up, &n_a);
}
}
up++;
}
}
max = --up - myorigmark;
if (PL_sortcop) {
if (max > 1) {
PERL_CONTEXT *cx;
SV** newsp;
bool oldcatch = CATCH_GET;
SAVETMPS;
SAVEOP();
CATCH_SET(TRUE);
PUSHSTACKi(PERLSI_SORT);
if (PL_sortstash != stash) {
PL_firstgv = gv_fetchpv("a", TRUE, SVt_PV);
PL_secondgv = gv_fetchpv("b", TRUE, SVt_PV);
PL_sortstash = stash;
}
SAVESPTR(GvSV(PL_firstgv));
SAVESPTR(GvSV(PL_secondgv));
PUSHBLOCK(cx, CXt_NULL, PL_stack_base);
if (!(PL_op->op_flags & OPf_SPECIAL)) {
bool hasargs = FALSE;
cx->cx_type = CXt_SUB;
cx->blk_gimme = G_SCALAR;
PUSHSUB(cx);
if (!CvDEPTH(cv))
(void)SvREFCNT_inc(cv); /* in preparation for POPSUB */
}
PL_sortcxix = cxstack_ix;
qsortsv((myorigmark+1), max, FUNC_NAME_TO_PTR(sortcv));
POPBLOCK(cx,PL_curpm);
POPSTACK;
CATCH_SET(oldcatch);
}
}
else {
if (max > 1) {
MEXTEND(SP, 20); /* Can't afford stack realloc on signal. */
qsortsv(ORIGMARK+1, max,
(PL_op->op_private & OPpLOCALE)
? ( overloading
? FUNC_NAME_TO_PTR(amagic_cmp_locale)
: FUNC_NAME_TO_PTR(sv_cmp_locale))
: ( overloading
? FUNC_NAME_TO_PTR(amagic_cmp)
: FUNC_NAME_TO_PTR(sv_cmp) ));
}
}
LEAVE;
PL_stack_sp = ORIGMARK + max;
return nextop;
}
/* Range stuff. */
PP(pp_range)
{
if (GIMME == G_ARRAY)
return cCONDOP->op_true;
return SvTRUEx(PAD_SV(PL_op->op_targ)) ? cCONDOP->op_false : cCONDOP->op_true;
}
PP(pp_flip)
{
djSP;
if (GIMME == G_ARRAY) {
RETURNOP(((CONDOP*)cUNOP->op_first)->op_false);
}
else {
dTOPss;
SV *targ = PAD_SV(PL_op->op_targ);
if ((PL_op->op_private & OPpFLIP_LINENUM)
? (PL_last_in_gv && SvIV(sv) == (IV)IoLINES(GvIOp(PL_last_in_gv)))
: SvTRUE(sv) ) {
sv_setiv(PAD_SV(cUNOP->op_first->op_targ), 1);
if (PL_op->op_flags & OPf_SPECIAL) {
sv_setiv(targ, 1);
SETs(targ);
RETURN;
}
else {
sv_setiv(targ, 0);
SP--;
RETURNOP(((CONDOP*)cUNOP->op_first)->op_false);
}
}
sv_setpv(TARG, "");
SETs(targ);
RETURN;
}
}
PP(pp_flop)
{
djSP;
if (GIMME == G_ARRAY) {
dPOPPOPssrl;
register I32 i, j;
register SV *sv;
I32 max;
if (SvNIOKp(left) || !SvPOKp(left) ||
(looks_like_number(left) && *SvPVX(left) != '0') )
{
if (SvNV(left) < IV_MIN || SvNV(right) > IV_MAX)
croak("Range iterator outside integer range");
i = SvIV(left);
max = SvIV(right);
if (max >= i) {
j = max - i + 1;
EXTEND_MORTAL(j);
EXTEND(SP, j);
}
else
j = 0;
while (j--) {
sv = sv_2mortal(newSViv(i++));
PUSHs(sv);
}
}
else {
SV *final = sv_mortalcopy(right);
STRLEN len;
STRLEN n_a;
char *tmps = SvPV(final, len);
sv = sv_mortalcopy(left);
SvPV_force(sv,n_a);
while (!SvNIOKp(sv) && SvCUR(sv) <= len) {
XPUSHs(sv);
if (strEQ(SvPVX(sv),tmps))
break;
sv = sv_2mortal(newSVsv(sv));
sv_inc(sv);
}
}
}
else {
dTOPss;
SV *targ = PAD_SV(cUNOP->op_first->op_targ);
sv_inc(targ);
if ((PL_op->op_private & OPpFLIP_LINENUM)
? (PL_last_in_gv && SvIV(sv) == (IV)IoLINES(GvIOp(PL_last_in_gv)))
: SvTRUE(sv) ) {
sv_setiv(PAD_SV(((UNOP*)cUNOP->op_first)->op_first->op_targ), 0);
sv_catpv(targ, "E0");
}
SETs(targ);
}
RETURN;
}
/* Control. */
STATIC I32
dopoptolabel(char *label)
{
dTHR;
register I32 i;
register PERL_CONTEXT *cx;
for (i = cxstack_ix; i >= 0; i--) {
cx = &cxstack[i];
switch (CxTYPE(cx)) {
case CXt_SUBST:
if (PL_dowarn)
warn("Exiting substitution via %s", op_name[PL_op->op_type]);
break;
case CXt_SUB:
if (PL_dowarn)
warn("Exiting subroutine via %s", op_name[PL_op->op_type]);
break;
case CXt_EVAL:
if (PL_dowarn)
warn("Exiting eval via %s", op_name[PL_op->op_type]);
break;
case CXt_NULL:
if (PL_dowarn)
warn("Exiting pseudo-block via %s", op_name[PL_op->op_type]);
return -1;
case CXt_LOOP:
if (!cx->blk_loop.label ||
strNE(label, cx->blk_loop.label) ) {
DEBUG_l(deb("(Skipping label #%ld %s)\n",
(long)i, cx->blk_loop.label));
continue;
}
DEBUG_l( deb("(Found label #%ld %s)\n", (long)i, label));
return i;
}
}
return i;
}
I32
dowantarray(void)
{
I32 gimme = block_gimme();
return (gimme == G_VOID) ? G_SCALAR : gimme;
}
I32
block_gimme(void)
{
dTHR;
I32 cxix;
cxix = dopoptosub(cxstack_ix);
if (cxix < 0)
return G_VOID;
switch (cxstack[cxix].blk_gimme) {
case G_VOID:
return G_VOID;
case G_SCALAR:
return G_SCALAR;
case G_ARRAY:
return G_ARRAY;
default:
croak("panic: bad gimme: %d\n", cxstack[cxix].blk_gimme);
/* NOTREACHED */
return 0;
}
}
STATIC I32
dopoptosub(I32 startingblock)
{
dTHR;
return dopoptosub_at(cxstack, startingblock);
}
STATIC I32
dopoptosub_at(PERL_CONTEXT *cxstk, I32 startingblock)
{
dTHR;
I32 i;
register PERL_CONTEXT *cx;
for (i = startingblock; i >= 0; i--) {
cx = &cxstk[i];
switch (CxTYPE(cx)) {
default:
continue;
case CXt_EVAL:
case CXt_SUB:
DEBUG_l( deb("(Found sub #%ld)\n", (long)i));
return i;
}
}
return i;
}
STATIC I32
dopoptoeval(I32 startingblock)
{
dTHR;
I32 i;
register PERL_CONTEXT *cx;
for (i = startingblock; i >= 0; i--) {
cx = &cxstack[i];
switch (CxTYPE(cx)) {
default:
continue;
case CXt_EVAL:
DEBUG_l( deb("(Found eval #%ld)\n", (long)i));
return i;
}
}
return i;
}
STATIC I32
dopoptoloop(I32 startingblock)
{
dTHR;
I32 i;
register PERL_CONTEXT *cx;
for (i = startingblock; i >= 0; i--) {
cx = &cxstack[i];
switch (CxTYPE(cx)) {
case CXt_SUBST:
if (PL_dowarn)
warn("Exiting substitution via %s", op_name[PL_op->op_type]);
break;
case CXt_SUB:
if (PL_dowarn)
warn("Exiting subroutine via %s", op_name[PL_op->op_type]);
break;
case CXt_EVAL:
if (PL_dowarn)
warn("Exiting eval via %s", op_name[PL_op->op_type]);
break;
case CXt_NULL:
if (PL_dowarn)
warn("Exiting pseudo-block via %s", op_name[PL_op->op_type]);
return -1;
case CXt_LOOP:
DEBUG_l( deb("(Found loop #%ld)\n", (long)i));
return i;
}
}
return i;
}
void
dounwind(I32 cxix)
{
dTHR;
register PERL_CONTEXT *cx;
SV **newsp;
I32 optype;
while (cxstack_ix > cxix) {
cx = &cxstack[cxstack_ix];
DEBUG_l(PerlIO_printf(Perl_debug_log, "Unwinding block %ld, type %s\n",
(long) cxstack_ix, block_type[CxTYPE(cx)]));
/* Note: we don't need to restore the base context info till the end. */
switch (CxTYPE(cx)) {
case CXt_SUBST:
POPSUBST(cx);
continue; /* not break */
case CXt_SUB:
POPSUB(cx);
break;
case CXt_EVAL:
POPEVAL(cx);
break;
case CXt_LOOP:
POPLOOP(cx);
break;
case CXt_NULL:
break;
}
cxstack_ix--;
}
}
OP *
die_where(char *message)
{
dSP;
STRLEN n_a;
if (PL_in_eval) {
I32 cxix;
register PERL_CONTEXT *cx;
I32 gimme;
SV **newsp;
if (message) {
if (PL_in_eval & 4) {
SV **svp;
STRLEN klen = strlen(message);
svp = hv_fetch(ERRHV, message, klen, TRUE);
if (svp) {
if (!SvIOK(*svp)) {
static char prefix[] = "\t(in cleanup) ";
SV *err = ERRSV;
sv_upgrade(*svp, SVt_IV);
(void)SvIOK_only(*svp);
if (!SvPOK(err))
sv_setpv(err,"");
SvGROW(err, SvCUR(err)+sizeof(prefix)+klen);
sv_catpvn(err, prefix, sizeof(prefix)-1);
sv_catpvn(err, message, klen);
}
sv_inc(*svp);
}
}
else
sv_setpv(ERRSV, message);
}
else
message = SvPVx(ERRSV, n_a);
while ((cxix = dopoptoeval(cxstack_ix)) < 0 && PL_curstackinfo->si_prev) {
dounwind(-1);
POPSTACK;
}
if (cxix >= 0) {
I32 optype;
if (cxix < cxstack_ix)
dounwind(cxix);
POPBLOCK(cx,PL_curpm);
if (CxTYPE(cx) != CXt_EVAL) {
PerlIO_printf(PerlIO_stderr(), "panic: die %s", message);
my_exit(1);
}
POPEVAL(cx);
if (gimme == G_SCALAR)
*++newsp = &PL_sv_undef;
PL_stack_sp = newsp;
LEAVE;
if (optype == OP_REQUIRE) {
char* msg = SvPVx(ERRSV, n_a);
DIE("%s", *msg ? msg : "Compilation failed in require");
}
return pop_return();
}
}
if(!message)
message = SvPVx(ERRSV, n_a);
PerlIO_printf(PerlIO_stderr(), "%s",message);
PerlIO_flush(PerlIO_stderr());
my_failure_exit();
/* NOTREACHED */
return 0;
}
PP(pp_xor)
{
djSP; dPOPTOPssrl;
if (SvTRUE(left) != SvTRUE(right))
RETSETYES;
else
RETSETNO;
}
PP(pp_andassign)
{
djSP;
if (!SvTRUE(TOPs))
RETURN;
else
RETURNOP(cLOGOP->op_other);
}
PP(pp_orassign)
{
djSP;
if (SvTRUE(TOPs))
RETURN;
else
RETURNOP(cLOGOP->op_other);
}
PP(pp_caller)
{
djSP;
register I32 cxix = dopoptosub(cxstack_ix);
register PERL_CONTEXT *cx;
register PERL_CONTEXT *ccstack = cxstack;
PERL_SI *top_si = PL_curstackinfo;
I32 dbcxix;
I32 gimme;
HV *hv;
SV *sv;
I32 count = 0;
if (MAXARG)
count = POPi;
EXTEND(SP, 6);
for (;;) {
/* we may be in a higher stacklevel, so dig down deeper */
while (cxix < 0 && top_si->si_type != PERLSI_MAIN) {
top_si = top_si->si_prev;
ccstack = top_si->si_cxstack;
cxix = dopoptosub_at(ccstack, top_si->si_cxix);
}
if (cxix < 0) {
if (GIMME != G_ARRAY)
RETPUSHUNDEF;
RETURN;
}
if (PL_DBsub && cxix >= 0 &&
ccstack[cxix].blk_sub.cv == GvCV(PL_DBsub))
count++;
if (!count--)
break;
cxix = dopoptosub_at(ccstack, cxix - 1);
}
cx = &ccstack[cxix];
if (CxTYPE(cx) == CXt_SUB) {
dbcxix = dopoptosub_at(ccstack, cxix - 1);
/* We expect that ccstack[dbcxix] is CXt_SUB, anyway, the
field below is defined for any cx. */
if (PL_DBsub && dbcxix >= 0 && ccstack[dbcxix].blk_sub.cv == GvCV(PL_DBsub))
cx = &ccstack[dbcxix];
}
if (GIMME != G_ARRAY) {
hv = cx->blk_oldcop->cop_stash;
if (!hv)
PUSHs(&PL_sv_undef);
else {
dTARGET;
sv_setpv(TARG, HvNAME(hv));
PUSHs(TARG);
}
RETURN;
}
hv = cx->blk_oldcop->cop_stash;
if (!hv)
PUSHs(&PL_sv_undef);
else
PUSHs(sv_2mortal(newSVpv(HvNAME(hv), 0)));
PUSHs(sv_2mortal(newSVpv(SvPVX(GvSV(cx->blk_oldcop->cop_filegv)), 0)));
PUSHs(sv_2mortal(newSViv((I32)cx->blk_oldcop->cop_line)));
if (!MAXARG)
RETURN;
if (CxTYPE(cx) == CXt_SUB) { /* So is ccstack[dbcxix]. */
sv = NEWSV(49, 0);
gv_efullname3(sv, CvGV(ccstack[cxix].blk_sub.cv), Nullch);
PUSHs(sv_2mortal(sv));
PUSHs(sv_2mortal(newSViv((I32)cx->blk_sub.hasargs)));
}
else {
PUSHs(sv_2mortal(newSVpv("(eval)",0)));
PUSHs(sv_2mortal(newSViv(0)));
}
gimme = (I32)cx->blk_gimme;
if (gimme == G_VOID)
PUSHs(&PL_sv_undef);
else
PUSHs(sv_2mortal(newSViv(gimme & G_ARRAY)));
if (CxTYPE(cx) == CXt_EVAL) {
if (cx->blk_eval.old_op_type == OP_ENTEREVAL) {
PUSHs(cx->blk_eval.cur_text);
PUSHs(&PL_sv_no);
}
else if (cx->blk_eval.old_name) { /* Try blocks have old_name == 0. */
/* Require, put the name. */
PUSHs(sv_2mortal(newSVpv(cx->blk_eval.old_name, 0)));
PUSHs(&PL_sv_yes);
}
}
else if (CxTYPE(cx) == CXt_SUB &&
cx->blk_sub.hasargs &&
PL_curcop->cop_stash == PL_debstash)
{
AV *ary = cx->blk_sub.argarray;
int off = AvARRAY(ary) - AvALLOC(ary);
if (!PL_dbargs) {
GV* tmpgv;
PL_dbargs = GvAV(gv_AVadd(tmpgv = gv_fetchpv("DB::args", TRUE,
SVt_PVAV)));
GvMULTI_on(tmpgv);
AvREAL_off(PL_dbargs); /* XXX Should be REIFY */
}
if (AvMAX(PL_dbargs) < AvFILLp(ary) + off)
av_extend(PL_dbargs, AvFILLp(ary) + off);
Copy(AvALLOC(ary), AvARRAY(PL_dbargs), AvFILLp(ary) + 1 + off, SV*);
AvFILLp(PL_dbargs) = AvFILLp(ary) + off;
}
RETURN;
}
STATIC I32
sortcv(SV *a, SV *b)
{
dTHR;
I32 oldsaveix = PL_savestack_ix;
I32 oldscopeix = PL_scopestack_ix;
I32 result;
GvSV(PL_firstgv) = a;
GvSV(PL_secondgv) = b;
PL_stack_sp = PL_stack_base;
PL_op = PL_sortcop;
CALLRUNOPS();
if (PL_stack_sp != PL_stack_base + 1)
croak("Sort subroutine didn't return single value");
if (!SvNIOKp(*PL_stack_sp))
croak("Sort subroutine didn't return a numeric value");
result = SvIV(*PL_stack_sp);
while (PL_scopestack_ix > oldscopeix) {
LEAVE;
}
leave_scope(oldsaveix);
return result;
}
PP(pp_reset)
{
djSP;
char *tmps;
STRLEN n_a;
if (MAXARG < 1)
tmps = "";
else
tmps = POPpx;
sv_reset(tmps, PL_curcop->cop_stash);
PUSHs(&PL_sv_yes);
RETURN;
}
PP(pp_lineseq)
{
return NORMAL;
}
PP(pp_dbstate)
{
PL_curcop = (COP*)PL_op;
TAINT_NOT; /* Each statement is presumed innocent */
PL_stack_sp = PL_stack_base + cxstack[cxstack_ix].blk_oldsp;
FREETMPS;
if (PL_op->op_private || SvIV(PL_DBsingle) || SvIV(PL_DBsignal) || SvIV(PL_DBtrace))
{
djSP;
register CV *cv;
register PERL_CONTEXT *cx;
I32 gimme = G_ARRAY;
I32 hasargs;
GV *gv;
gv = PL_DBgv;
cv = GvCV(gv);
if (!cv)
DIE("No DB::DB routine defined");
if (CvDEPTH(cv) >= 1 && !(PL_debug & (1<<30))) /* don't do recursive DB::DB call */
return NORMAL;
ENTER;
SAVETMPS;
SAVEI32(PL_debug);
SAVESTACK_POS();
PL_debug = 0;
hasargs = 0;
SPAGAIN;
push_return(PL_op->op_next);
PUSHBLOCK(cx, CXt_SUB, SP);
PUSHSUB(cx);
CvDEPTH(cv)++;
(void)SvREFCNT_inc(cv);
SAVESPTR(PL_curpad);
PL_curpad = AvARRAY((AV*)*av_fetch(CvPADLIST(cv),1,FALSE));
RETURNOP(CvSTART(cv));
}
else
return NORMAL;
}
PP(pp_scope)
{
return NORMAL;
}
PP(pp_enteriter)
{
djSP; dMARK;
register PERL_CONTEXT *cx;
I32 gimme = GIMME_V;
SV **svp;
ENTER;
SAVETMPS;
#ifdef USE_THREADS
if (PL_op->op_flags & OPf_SPECIAL) {
dTHR;
svp = &THREADSV(PL_op->op_targ); /* per-thread variable */
SAVEGENERICSV(*svp);
*svp = NEWSV(0,0);
}
else
#endif /* USE_THREADS */
if (PL_op->op_targ) {
svp = &PL_curpad[PL_op->op_targ]; /* "my" variable */
SAVESPTR(*svp);
}
else {
svp = &GvSV((GV*)POPs); /* symbol table variable */
SAVEGENERICSV(*svp);
*svp = NEWSV(0,0);
}
ENTER;
PUSHBLOCK(cx, CXt_LOOP, SP);
PUSHLOOP(cx, svp, MARK);
if (PL_op->op_flags & OPf_STACKED) {
cx->blk_loop.iterary = (AV*)SvREFCNT_inc(POPs);
if (SvTYPE(cx->blk_loop.iterary) != SVt_PVAV) {
dPOPss;
if (SvNIOKp(sv) || !SvPOKp(sv) ||
(looks_like_number(sv) && *SvPVX(sv) != '0')) {
if (SvNV(sv) < IV_MIN ||
SvNV((SV*)cx->blk_loop.iterary) >= IV_MAX)
croak("Range iterator outside integer range");
cx->blk_loop.iterix = SvIV(sv);
cx->blk_loop.itermax = SvIV((SV*)cx->blk_loop.iterary);
}
else
cx->blk_loop.iterlval = newSVsv(sv);
}
}
else {
cx->blk_loop.iterary = PL_curstack;
AvFILLp(PL_curstack) = SP - PL_stack_base;
cx->blk_loop.iterix = MARK - PL_stack_base;
}
RETURN;
}
PP(pp_enterloop)
{
djSP;
register PERL_CONTEXT *cx;
I32 gimme = GIMME_V;
ENTER;
SAVETMPS;
ENTER;
PUSHBLOCK(cx, CXt_LOOP, SP);
PUSHLOOP(cx, 0, SP);
RETURN;
}
PP(pp_leaveloop)
{
djSP;
register PERL_CONTEXT *cx;
struct block_loop cxloop;
I32 gimme;
SV **newsp;
PMOP *newpm;
SV **mark;
POPBLOCK(cx,newpm);
mark = newsp;
POPLOOP1(cx); /* Delay POPLOOP2 until stack values are safe */
TAINT_NOT;
if (gimme == G_VOID)
; /* do nothing */
else if (gimme == G_SCALAR) {
if (mark < SP)
*++newsp = sv_mortalcopy(*SP);
else
*++newsp = &PL_sv_undef;
}
else {
while (mark < SP) {
*++newsp = sv_mortalcopy(*++mark);
TAINT_NOT; /* Each item is independent */
}
}
SP = newsp;
PUTBACK;
POPLOOP2(); /* Stack values are safe: release loop vars ... */
PL_curpm = newpm; /* ... and pop $1 et al */
LEAVE;
LEAVE;
return NORMAL;
}
PP(pp_return)
{
djSP; dMARK;
I32 cxix;
register PERL_CONTEXT *cx;
struct block_sub cxsub;
bool popsub2 = FALSE;
I32 gimme;
SV **newsp;
PMOP *newpm;
I32 optype = 0;
if (PL_curstackinfo->si_type == PERLSI_SORT) {
if (cxstack_ix == PL_sortcxix || dopoptosub(cxstack_ix) <= PL_sortcxix) {
if (cxstack_ix > PL_sortcxix)
dounwind(PL_sortcxix);
AvARRAY(PL_curstack)[1] = *SP;
PL_stack_sp = PL_stack_base + 1;
return 0;
}
}
cxix = dopoptosub(cxstack_ix);
if (cxix < 0)
DIE("Can't return outside a subroutine");
if (cxix < cxstack_ix)
dounwind(cxix);
POPBLOCK(cx,newpm);
switch (CxTYPE(cx)) {
case CXt_SUB:
POPSUB1(cx); /* Delay POPSUB2 until stack values are safe */
popsub2 = TRUE;
break;
case CXt_EVAL:
POPEVAL(cx);
if (optype == OP_REQUIRE &&
(MARK == SP || (gimme == G_SCALAR && !SvTRUE(*SP))) )
{
/* Unassume the success we assumed earlier. */
char *name = cx->blk_eval.old_name;
(void)hv_delete(GvHVn(PL_incgv), name, strlen(name), G_DISCARD);
DIE("%s did not return a true value", name);
}
break;
default:
DIE("panic: return");
}
TAINT_NOT;
if (gimme == G_SCALAR) {
if (MARK < SP) {
if (popsub2) {
if (cxsub.cv && CvDEPTH(cxsub.cv) > 1) {
if (SvTEMP(TOPs)) {
*++newsp = SvREFCNT_inc(*SP);
FREETMPS;
sv_2mortal(*newsp);
} else {
FREETMPS;
*++newsp = sv_mortalcopy(*SP);
}
} else
*++newsp = (SvTEMP(*SP)) ? *SP : sv_mortalcopy(*SP);
} else
*++newsp = sv_mortalcopy(*SP);
} else
*++newsp = &PL_sv_undef;
}
else if (gimme == G_ARRAY) {
while (++MARK <= SP) {
*++newsp = (popsub2 && SvTEMP(*MARK))
? *MARK : sv_mortalcopy(*MARK);
TAINT_NOT; /* Each item is independent */
}
}
PL_stack_sp = newsp;
/* Stack values are safe: */
if (popsub2) {
POPSUB2(); /* release CV and @_ ... */
}
PL_curpm = newpm; /* ... and pop $1 et al */
LEAVE;
return pop_return();
}
PP(pp_last)
{
djSP;
I32 cxix;
register PERL_CONTEXT *cx;
struct block_loop cxloop;
struct block_sub cxsub;
I32 pop2 = 0;
I32 gimme;
I32 optype;
OP *nextop;
SV **newsp;
PMOP *newpm;
SV **mark = PL_stack_base + cxstack[cxstack_ix].blk_oldsp;
if (PL_op->op_flags & OPf_SPECIAL) {
cxix = dopoptoloop(cxstack_ix);
if (cxix < 0)
DIE("Can't \"last\" outside a block");
}
else {
cxix = dopoptolabel(cPVOP->op_pv);
if (cxix < 0)
DIE("Label not found for \"last %s\"", cPVOP->op_pv);
}
if (cxix < cxstack_ix)
dounwind(cxix);
POPBLOCK(cx,newpm);
switch (CxTYPE(cx)) {
case CXt_LOOP:
POPLOOP1(cx); /* Delay POPLOOP2 until stack values are safe */
pop2 = CXt_LOOP;
nextop = cxloop.last_op->op_next;
break;
case CXt_SUB:
POPSUB1(cx); /* Delay POPSUB2 until stack values are safe */
pop2 = CXt_SUB;
nextop = pop_return();
break;
case CXt_EVAL:
POPEVAL(cx);
nextop = pop_return();
break;
default:
DIE("panic: last");
}
TAINT_NOT;
if (gimme == G_SCALAR) {
if (MARK < SP)
*++newsp = ((pop2 == CXt_SUB) && SvTEMP(*SP))
? *SP : sv_mortalcopy(*SP);
else
*++newsp = &PL_sv_undef;
}
else if (gimme == G_ARRAY) {
while (++MARK <= SP) {
*++newsp = ((pop2 == CXt_SUB) && SvTEMP(*MARK))
? *MARK : sv_mortalcopy(*MARK);
TAINT_NOT; /* Each item is independent */
}
}
SP = newsp;
PUTBACK;
/* Stack values are safe: */
switch (pop2) {
case CXt_LOOP:
POPLOOP2(); /* release loop vars ... */
LEAVE;
break;
case CXt_SUB:
POPSUB2(); /* release CV and @_ ... */
break;
}
PL_curpm = newpm; /* ... and pop $1 et al */
LEAVE;
return nextop;
}
PP(pp_next)
{
I32 cxix;
register PERL_CONTEXT *cx;
I32 oldsave;
if (PL_op->op_flags & OPf_SPECIAL) {
cxix = dopoptoloop(cxstack_ix);
if (cxix < 0)
DIE("Can't \"next\" outside a block");
}
else {
cxix = dopoptolabel(cPVOP->op_pv);
if (cxix < 0)
DIE("Label not found for \"next %s\"", cPVOP->op_pv);
}
if (cxix < cxstack_ix)
dounwind(cxix);
TOPBLOCK(cx);
oldsave = PL_scopestack[PL_scopestack_ix - 1];
LEAVE_SCOPE(oldsave);
return cx->blk_loop.next_op;
}
PP(pp_redo)
{
I32 cxix;
register PERL_CONTEXT *cx;
I32 oldsave;
if (PL_op->op_flags & OPf_SPECIAL) {
cxix = dopoptoloop(cxstack_ix);
if (cxix < 0)
DIE("Can't \"redo\" outside a block");
}
else {
cxix = dopoptolabel(cPVOP->op_pv);
if (cxix < 0)
DIE("Label not found for \"redo %s\"", cPVOP->op_pv);
}
if (cxix < cxstack_ix)
dounwind(cxix);
TOPBLOCK(cx);
oldsave = PL_scopestack[PL_scopestack_ix - 1];
LEAVE_SCOPE(oldsave);
return cx->blk_loop.redo_op;
}
STATIC OP *
dofindlabel(OP *o, char *label, OP **opstack, OP **oplimit)
{
OP *kid;
OP **ops = opstack;
static char too_deep[] = "Target of goto is too deeply nested";
if (ops >= oplimit)
croak(too_deep);
if (o->op_type == OP_LEAVE ||
o->op_type == OP_SCOPE ||
o->op_type == OP_LEAVELOOP ||
o->op_type == OP_LEAVETRY)
{
*ops++ = cUNOPo->op_first;
if (ops >= oplimit)
croak(too_deep);
}
*ops = 0;
if (o->op_flags & OPf_KIDS) {
dTHR;
/* First try all the kids at this level, since that's likeliest. */
for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling) {
if ((kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE) &&
kCOP->cop_label && strEQ(kCOP->cop_label, label))
return kid;
}
for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling) {
if (kid == PL_lastgotoprobe)
continue;
if ((kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE) &&
(ops == opstack ||
(ops[-1]->op_type != OP_NEXTSTATE &&
ops[-1]->op_type != OP_DBSTATE)))
*ops++ = kid;
if (o = dofindlabel(kid, label, ops, oplimit))
return o;
}
}
*ops = 0;
return 0;
}
PP(pp_dump)
{
return pp_goto(ARGS);
/*NOTREACHED*/
}
PP(pp_goto)
{
djSP;
OP *retop = 0;
I32 ix;
register PERL_CONTEXT *cx;
#define GOTO_DEPTH 64
OP *enterops[GOTO_DEPTH];
char *label;
int do_dump = (PL_op->op_type == OP_DUMP);
label = 0;
if (PL_op->op_flags & OPf_STACKED) {
SV *sv = POPs;
STRLEN n_a;
/* This egregious kludge implements goto &subroutine */
if (SvROK(sv) && SvTYPE(SvRV(sv)) == SVt_PVCV) {
I32 cxix;
register PERL_CONTEXT *cx;
CV* cv = (CV*)SvRV(sv);
SV** mark;
I32 items = 0;
I32 oldsave;
int arg_was_real = 0;
retry:
if (!CvROOT(cv) && !CvXSUB(cv)) {
GV *gv = CvGV(cv);
GV *autogv;
if (gv) {
SV *tmpstr;
/* autoloaded stub? */
if (cv != GvCV(gv) && (cv = GvCV(gv)))
goto retry;
autogv = gv_autoload4(GvSTASH(gv), GvNAME(gv),
GvNAMELEN(gv), FALSE);
if (autogv && (cv = GvCV(autogv)))
goto retry;
tmpstr = sv_newmortal();
gv_efullname3(tmpstr, gv, Nullch);
DIE("Goto undefined subroutine &%s",SvPVX(tmpstr));
}
DIE("Goto undefined subroutine");
}
/* First do some returnish stuff. */
cxix = dopoptosub(cxstack_ix);
if (cxix < 0)
DIE("Can't goto subroutine outside a subroutine");
if (cxix < cxstack_ix)
dounwind(cxix);
TOPBLOCK(cx);
if (CxTYPE(cx) == CXt_EVAL && cx->blk_eval.old_op_type == OP_ENTEREVAL)
DIE("Can't goto subroutine from an eval-string");
mark = PL_stack_sp;
if (CxTYPE(cx) == CXt_SUB &&
cx->blk_sub.hasargs) { /* put @_ back onto stack */
AV* av = cx->blk_sub.argarray;
items = AvFILLp(av) + 1;
PL_stack_sp++;
EXTEND(PL_stack_sp, items); /* @_ could have been extended. */
Copy(AvARRAY(av), PL_stack_sp, items, SV*);
PL_stack_sp += items;
#ifndef USE_THREADS
SvREFCNT_dec(GvAV(PL_defgv));
GvAV(PL_defgv) = cx->blk_sub.savearray;
#endif /* USE_THREADS */
if (AvREAL(av)) {
arg_was_real = 1;
AvREAL_off(av); /* so av_clear() won't clobber elts */
}
av_clear(av);
}
else if (CvXSUB(cv)) { /* put GvAV(defgv) back onto stack */
AV* av;
int i;
#ifdef USE_THREADS
av = (AV*)PL_curpad[0];
#else
av = GvAV(PL_defgv);
#endif
items = AvFILLp(av) + 1;
PL_stack_sp++;
EXTEND(PL_stack_sp, items); /* @_ could have been extended. */
Copy(AvARRAY(av), PL_stack_sp, items, SV*);
PL_stack_sp += items;
}
if (CxTYPE(cx) == CXt_SUB &&
!(CvDEPTH(cx->blk_sub.cv) = cx->blk_sub.olddepth))
SvREFCNT_dec(cx->blk_sub.cv);
oldsave = PL_scopestack[PL_scopestack_ix - 1];
LEAVE_SCOPE(oldsave);
/* Now do some callish stuff. */
SAVETMPS;
if (CvXSUB(cv)) {
if (CvOLDSTYLE(cv)) {
I32 (*fp3)_((int,int,int));
while (SP > mark) {
SP[1] = SP[0];
SP--;
}
fp3 = (I32(*)_((int,int,int)))CvXSUB(cv);
items = (*fp3)(CvXSUBANY(cv).any_i32,
mark - PL_stack_base + 1,
items);
SP = PL_stack_base + items;
}
else {
SV **newsp;
I32 gimme;
PL_stack_sp--; /* There is no cv arg. */
/* Push a mark for the start of arglist */
PUSHMARK(mark);
(void)(*CvXSUB(cv))(cv _PERL_OBJECT_THIS);
/* Pop the current context like a decent sub should */
POPBLOCK(cx, PL_curpm);
/* Do _not_ use PUTBACK, keep the XSUB's return stack! */
}
LEAVE;
return pop_return();
}
else {
AV* padlist = CvPADLIST(cv);
SV** svp = AvARRAY(padlist);
if (CxTYPE(cx) == CXt_EVAL) {
PL_in_eval = cx->blk_eval.old_in_eval;
PL_eval_root = cx->blk_eval.old_eval_root;
cx->cx_type = CXt_SUB;
cx->blk_sub.hasargs = 0;
}
cx->blk_sub.cv = cv;
cx->blk_sub.olddepth = CvDEPTH(cv);
CvDEPTH(cv)++;
if (CvDEPTH(cv) < 2)
(void)SvREFCNT_inc(cv);
else { /* save temporaries on recursion? */
if (CvDEPTH(cv) == 100 && PL_dowarn)
sub_crush_depth(cv);
if (CvDEPTH(cv) > AvFILLp(padlist)) {
AV *newpad = newAV();
SV **oldpad = AvARRAY(svp[CvDEPTH(cv)-1]);
I32 ix = AvFILLp((AV*)svp[1]);
svp = AvARRAY(svp[0]);
for ( ;ix > 0; ix--) {
if (svp[ix] != &PL_sv_undef) {
char *name = SvPVX(svp[ix]);
if ((SvFLAGS(svp[ix]) & SVf_FAKE)
|| *name == '&')
{
/* outer lexical or anon code */
av_store(newpad, ix,
SvREFCNT_inc(oldpad[ix]) );
}
else { /* our own lexical */
if (*name == '@')
av_store(newpad, ix, sv = (SV*)newAV());
else if (*name == '%')
av_store(newpad, ix, sv = (SV*)newHV());
else
av_store(newpad, ix, sv = NEWSV(0,0));
SvPADMY_on(sv);
}
}
else {
av_store(newpad, ix, sv = NEWSV(0,0));
SvPADTMP_on(sv);
}
}
if (cx->blk_sub.hasargs) {
AV* av = newAV();
av_extend(av, 0);
av_store(newpad, 0, (SV*)av);
AvFLAGS(av) = AVf_REIFY;
}
av_store(padlist, CvDEPTH(cv), (SV*)newpad);
AvFILLp(padlist) = CvDEPTH(cv);
svp = AvARRAY(padlist);
}
}
#ifdef USE_THREADS
if (!cx->blk_sub.hasargs) {
AV* av = (AV*)PL_curpad[0];
items = AvFILLp(av) + 1;
if (items) {
/* Mark is at the end of the stack. */
EXTEND(SP, items);
Copy(AvARRAY(av), SP + 1, items, SV*);
SP += items;
PUTBACK ;
}
}
#endif /* USE_THREADS */
SAVESPTR(PL_curpad);
PL_curpad = AvARRAY((AV*)svp[CvDEPTH(cv)]);
#ifndef USE_THREADS
if (cx->blk_sub.hasargs)
#endif /* USE_THREADS */
{
AV* av = (AV*)PL_curpad[0];
SV** ary;
#ifndef USE_THREADS
cx->blk_sub.savearray = GvAV(PL_defgv);
GvAV(PL_defgv) = (AV*)SvREFCNT_inc(av);
#endif /* USE_THREADS */
cx->blk_sub.argarray = av;
++mark;
if (items >= AvMAX(av) + 1) {
ary = AvALLOC(av);
if (AvARRAY(av) != ary) {
AvMAX(av) += AvARRAY(av) - AvALLOC(av);
SvPVX(av) = (char*)ary;
}
if (items >= AvMAX(av) + 1) {
AvMAX(av) = items - 1;
Renew(ary,items+1,SV*);
AvALLOC(av) = ary;
SvPVX(av) = (char*)ary;
}
}
Copy(mark,AvARRAY(av),items,SV*);
AvFILLp(av) = items - 1;
/* preserve @_ nature */
if (arg_was_real) {
AvREIFY_off(av);
AvREAL_on(av);
}
while (items--) {
if (*mark)
SvTEMP_off(*mark);
mark++;
}
}
if (PERLDB_SUB) { /* Checking curstash breaks DProf. */
/*
* We do not care about using sv to call CV;
* it's for informational purposes only.
*/
SV *sv = GvSV(PL_DBsub);
CV *gotocv;
if (PERLDB_SUB_NN) {
SvIVX(sv) = (IV)cv; /* Already upgraded, saved */
} else {
save_item(sv);
gv_efullname3(sv, CvGV(cv), Nullch);
}
if ( PERLDB_GOTO
&& (gotocv = perl_get_cv("DB::goto", FALSE)) ) {
PUSHMARK( PL_stack_sp );
perl_call_sv((SV*)gotocv, G_SCALAR | G_NODEBUG);
PL_stack_sp--;
}
}
RETURNOP(CvSTART(cv));
}
}
else
label = SvPV(sv,n_a);
}
else if (PL_op->op_flags & OPf_SPECIAL) {
if (! do_dump)
DIE("goto must have label");
}
else
label = cPVOP->op_pv;
if (label && *label) {
OP *gotoprobe = 0;
/* find label */
PL_lastgotoprobe = 0;
*enterops = 0;
for (ix = cxstack_ix; ix >= 0; ix--) {
cx = &cxstack[ix];
switch (CxTYPE(cx)) {
case CXt_EVAL:
gotoprobe = PL_eval_root; /* XXX not good for nested eval */
break;
case CXt_LOOP:
gotoprobe = cx->blk_oldcop->op_sibling;
break;
case CXt_SUBST:
continue;
case CXt_BLOCK:
if (ix)
gotoprobe = cx->blk_oldcop->op_sibling;
else
gotoprobe = PL_main_root;
break;
case CXt_SUB:
if (CvDEPTH(cx->blk_sub.cv)) {
gotoprobe = CvROOT(cx->blk_sub.cv);
break;
}
/* FALL THROUGH */
case CXt_NULL:
DIE("Can't \"goto\" outside a block");
default:
if (ix)
DIE("panic: goto");
gotoprobe = PL_main_root;
break;
}
retop = dofindlabel(gotoprobe, label,
enterops, enterops + GOTO_DEPTH);
if (retop)
break;
PL_lastgotoprobe = gotoprobe;
}
if (!retop)
DIE("Can't find label %s", label);
/* pop unwanted frames */
if (ix < cxstack_ix) {
I32 oldsave;
if (ix < 0)
ix = 0;
dounwind(ix);
TOPBLOCK(cx);
oldsave = PL_scopestack[PL_scopestack_ix];
LEAVE_SCOPE(oldsave);
}
/* push wanted frames */
if (*enterops && enterops[1]) {
OP *oldop = PL_op;
for (ix = 1; enterops[ix]; ix++) {
PL_op = enterops[ix];
/* Eventually we may want to stack the needed arguments
* for each op. For now, we punt on the hard ones. */
if (PL_op->op_type == OP_ENTERITER)
DIE("Can't \"goto\" into the middle of a foreach loop",
label);
(CALLOP->op_ppaddr)(ARGS);
}
PL_op = oldop;
}
}
if (do_dump) {
#ifdef VMS
if (!retop) retop = PL_main_start;
#endif
PL_restartop = retop;
PL_do_undump = TRUE;
my_unexec();
PL_restartop = 0; /* hmm, must be GNU unexec().. */
PL_do_undump = FALSE;
}
RETURNOP(retop);
}
PP(pp_exit)
{
djSP;
I32 anum;
if (MAXARG < 1)
anum = 0;
else {
anum = SvIVx(POPs);
#ifdef VMSISH_EXIT
if (anum == 1 && VMSISH_EXIT)
anum = 0;
#endif
}
my_exit(anum);
PUSHs(&PL_sv_undef);
RETURN;
}
#ifdef NOTYET
PP(pp_nswitch)
{
djSP;
double value = SvNVx(GvSV(cCOP->cop_gv));
register I32 match = I_32(value);
if (value < 0.0) {
if (((double)match) > value)
--match; /* was fractional--truncate other way */
}
match -= cCOP->uop.scop.scop_offset;
if (match < 0)
match = 0;
else if (match > cCOP->uop.scop.scop_max)
match = cCOP->uop.scop.scop_max;
PL_op = cCOP->uop.scop.scop_next[match];
RETURNOP(PL_op);
}
PP(pp_cswitch)
{
djSP;
register I32 match;
if (PL_multiline)
PL_op = PL_op->op_next; /* can't assume anything */
else {
STRLEN n_a;
match = *(SvPVx(GvSV(cCOP->cop_gv), n_a)) & 255;
match -= cCOP->uop.scop.scop_offset;
if (match < 0)
match = 0;
else if (match > cCOP->uop.scop.scop_max)
match = cCOP->uop.scop.scop_max;
PL_op = cCOP->uop.scop.scop_next[match];
}
RETURNOP(PL_op);
}
#endif
/* Eval. */
STATIC void
save_lines(AV *array, SV *sv)
{
register char *s = SvPVX(sv);
register char *send = SvPVX(sv) + SvCUR(sv);
register char *t;
register I32 line = 1;
while (s && s < send) {
SV *tmpstr = NEWSV(85,0);
sv_upgrade(tmpstr, SVt_PVMG);
t = strchr(s, '\n');
if (t)
t++;
else
t = send;
sv_setpvn(tmpstr, s, t - s);
av_store(array, line++, tmpstr);
s = t;
}
}
STATIC OP *
docatch(OP *o)
{
dTHR;
int ret;
OP *oldop = PL_op;
dJMPENV;
PL_op = o;
#ifdef DEBUGGING
assert(CATCH_GET == TRUE);
DEBUG_l(deb("Setting up local jumplevel %p, was %p\n", &cur_env, PL_top_env));
#endif
JMPENV_PUSH(ret);
switch (ret) {
default: /* topmost level handles it */
pass_the_buck:
JMPENV_POP;
PL_op = oldop;
JMPENV_JUMP(ret);
/* NOTREACHED */
case 3:
if (!PL_restartop)
goto pass_the_buck;
PL_op = PL_restartop;
PL_restartop = 0;
/* FALL THROUGH */
case 0:
CALLRUNOPS();
break;
}
JMPENV_POP;
PL_op = oldop;
return Nullop;
}
OP *
sv_compile_2op(SV *sv, OP** startop, char *code, AV** avp)
/* sv Text to convert to OP tree. */
/* startop op_free() this to undo. */
/* code Short string id of the caller. */
{
dSP; /* Make POPBLOCK work. */
PERL_CONTEXT *cx;
SV **newsp;
I32 gimme = 0; /* SUSPECT - INITIALZE TO WHAT? NI-S */
I32 optype;
OP dummy;
OP *oop = PL_op, *rop;
char tmpbuf[TYPE_DIGITS(long) + 12 + 10];
char *safestr;
ENTER;
lex_start(sv);
SAVETMPS;
/* switch to eval mode */
if (PL_curcop == &PL_compiling) {
SAVESPTR(PL_compiling.cop_stash);
PL_compiling.cop_stash = PL_curstash;
}
SAVESPTR(PL_compiling.cop_filegv);
SAVEI16(PL_compiling.cop_line);
sprintf(tmpbuf, "_<(%.10s_eval %lu)", code, (unsigned long)++PL_evalseq);
PL_compiling.cop_filegv = gv_fetchfile(tmpbuf+2);
PL_compiling.cop_line = 1;
/* XXX For C<eval "...">s within BEGIN {} blocks, this ends up
deleting the eval's FILEGV from the stash before gv_check() runs
(i.e. before run-time proper). To work around the coredump that
ensues, we always turn GvMULTI_on for any globals that were
introduced within evals. See force_ident(). GSAR 96-10-12 */
safestr = savepv(tmpbuf);
SAVEDELETE(PL_defstash, safestr, strlen(safestr));
SAVEHINTS();
#ifdef OP_IN_REGISTER
PL_opsave = op;
#else
SAVEPPTR(PL_op);
#endif
PL_hints = 0;
PL_op = &dummy;
PL_op->op_type = 0; /* Avoid uninit warning. */
PL_op->op_flags = 0; /* Avoid uninit warning. */
PUSHBLOCK(cx, CXt_EVAL, SP);
PUSHEVAL(cx, 0, PL_compiling.cop_filegv);
rop = doeval(G_SCALAR, startop);
POPBLOCK(cx,PL_curpm);
POPEVAL(cx);
(*startop)->op_type = OP_NULL;
(*startop)->op_ppaddr = ppaddr[OP_NULL];
lex_end();
*avp = (AV*)SvREFCNT_inc(PL_comppad);
LEAVE;
#ifdef OP_IN_REGISTER
op = PL_opsave;
#endif
return rop;
}
/* With USE_THREADS, eval_owner must be held on entry to doeval */
STATIC OP *
doeval(int gimme, OP** startop)
{
dSP;
OP *saveop = PL_op;
HV *newstash;
CV *caller;
AV* comppadlist;
I32 i;
PL_in_eval = 1;
PUSHMARK(SP);
/* set up a scratch pad */
SAVEI32(PL_padix);
SAVESPTR(PL_curpad);
SAVESPTR(PL_comppad);
SAVESPTR(PL_comppad_name);
SAVEI32(PL_comppad_name_fill);
SAVEI32(PL_min_intro_pending);
SAVEI32(PL_max_intro_pending);
caller = PL_compcv;
for (i = cxstack_ix - 1; i >= 0; i--) {
PERL_CONTEXT *cx = &cxstack[i];
if (CxTYPE(cx) == CXt_EVAL)
break;
else if (CxTYPE(cx) == CXt_SUB) {
caller = cx->blk_sub.cv;
break;
}
}
SAVESPTR(PL_compcv);
PL_compcv = (CV*)NEWSV(1104,0);
sv_upgrade((SV *)PL_compcv, SVt_PVCV);
CvEVAL_on(PL_compcv);
#ifdef USE_THREADS
CvOWNER(PL_compcv) = 0;
New(666, CvMUTEXP(PL_compcv), 1, perl_mutex);
MUTEX_INIT(CvMUTEXP(PL_compcv));
#endif /* USE_THREADS */
PL_comppad = newAV();
av_push(PL_comppad, Nullsv);
PL_curpad = AvARRAY(PL_comppad);
PL_comppad_name = newAV();
PL_comppad_name_fill = 0;
PL_min_intro_pending = 0;
PL_padix = 0;
#ifdef USE_THREADS
av_store(PL_comppad_name, 0, newSVpv("@_", 2));
PL_curpad[0] = (SV*)newAV();
SvPADMY_on(PL_curpad[0]); /* XXX Needed? */
#endif /* USE_THREADS */
comppadlist = newAV();
AvREAL_off(comppadlist);
av_store(comppadlist, 0, (SV*)PL_comppad_name);
av_store(comppadlist, 1, (SV*)PL_comppad);
CvPADLIST(PL_compcv) = comppadlist;
if (!saveop || saveop->op_type != OP_REQUIRE)
CvOUTSIDE(PL_compcv) = (CV*)SvREFCNT_inc(caller);
SAVEFREESV(PL_compcv);
/* make sure we compile in the right package */
newstash = PL_curcop->cop_stash;
if (PL_curstash != newstash) {
SAVESPTR(PL_curstash);
PL_curstash = newstash;
}
SAVESPTR(PL_beginav);
PL_beginav = newAV();
SAVEFREESV(PL_beginav);
/* try to compile it */
PL_eval_root = Nullop;
PL_error_count = 0;
PL_curcop = &PL_compiling;
PL_curcop->cop_arybase = 0;
SvREFCNT_dec(PL_rs);
PL_rs = newSVpv("\n", 1);
if (saveop && saveop->op_flags & OPf_SPECIAL)
PL_in_eval |= 4;
else
sv_setpv(ERRSV,"");
if (yyparse() || PL_error_count || !PL_eval_root) {
SV **newsp;
I32 gimme;
PERL_CONTEXT *cx;
I32 optype = 0; /* Might be reset by POPEVAL. */
STRLEN n_a;
PL_op = saveop;
if (PL_eval_root) {
op_free(PL_eval_root);
PL_eval_root = Nullop;
}
SP = PL_stack_base + POPMARK; /* pop original mark */
if (!startop) {
POPBLOCK(cx,PL_curpm);
POPEVAL(cx);
pop_return();
}
lex_end();
LEAVE;
if (optype == OP_REQUIRE) {
char* msg = SvPVx(ERRSV, n_a);
DIE("%s", *msg ? msg : "Compilation failed in require");
} else if (startop) {
char* msg = SvPVx(ERRSV, n_a);
POPBLOCK(cx,PL_curpm);
POPEVAL(cx);
croak("%sCompilation failed in regexp", (*msg ? msg : "Unknown error\n"));
}
SvREFCNT_dec(PL_rs);
PL_rs = SvREFCNT_inc(PL_nrs);
#ifdef USE_THREADS
MUTEX_LOCK(&PL_eval_mutex);
PL_eval_owner = 0;
COND_SIGNAL(&PL_eval_cond);
MUTEX_UNLOCK(&PL_eval_mutex);
#endif /* USE_THREADS */
RETPUSHUNDEF;
}
SvREFCNT_dec(PL_rs);
PL_rs = SvREFCNT_inc(PL_nrs);
PL_compiling.cop_line = 0;
if (startop) {
*startop = PL_eval_root;
SvREFCNT_dec(CvOUTSIDE(PL_compcv));
CvOUTSIDE(PL_compcv) = Nullcv;
} else
SAVEFREEOP(PL_eval_root);
if (gimme & G_VOID)
scalarvoid(PL_eval_root);
else if (gimme & G_ARRAY)
list(PL_eval_root);
else
scalar(PL_eval_root);
DEBUG_x(dump_eval());
/* Register with debugger: */
if (PERLDB_INTER && saveop->op_type == OP_REQUIRE) {
CV *cv = perl_get_cv("DB::postponed", FALSE);
if (cv) {
dSP;
PUSHMARK(SP);
XPUSHs((SV*)PL_compiling.cop_filegv);
PUTBACK;
perl_call_sv((SV*)cv, G_DISCARD);
}
}
/* compiled okay, so do it */
CvDEPTH(PL_compcv) = 1;
SP = PL_stack_base + POPMARK; /* pop original mark */
PL_op = saveop; /* The caller may need it. */
#ifdef USE_THREADS
MUTEX_LOCK(&PL_eval_mutex);
PL_eval_owner = 0;
COND_SIGNAL(&PL_eval_cond);
MUTEX_UNLOCK(&PL_eval_mutex);
#endif /* USE_THREADS */
RETURNOP(PL_eval_start);
}
PP(pp_require)
{
djSP;
register PERL_CONTEXT *cx;
SV *sv;
char *name;
STRLEN len;
char *tryname;
SV *namesv = Nullsv;
SV** svp;
I32 gimme = G_SCALAR;
PerlIO *tryrsfp = 0;
STRLEN n_a;
sv = POPs;
if (SvNIOKp(sv) && !SvPOKp(sv)) {
SET_NUMERIC_STANDARD();
if (atof(PL_patchlevel) + 0.00000999 < SvNV(sv))
DIE("Perl %s required--this is only version %s, stopped",
SvPV(sv,n_a),PL_patchlevel);
RETPUSHYES;
}
name = SvPV(sv, len);
if (!(name && len > 0 && *name))
DIE("Null filename used");
TAINT_PROPER("require");
if (PL_op->op_type == OP_REQUIRE &&
(svp = hv_fetch(GvHVn(PL_incgv), name, len, 0)) &&
*svp != &PL_sv_undef)
RETPUSHYES;
/* prepare to compile file */
if (*name == '/' ||
(*name == '.' &&
(name[1] == '/' ||
(name[1] == '.' && name[2] == '/')))
#ifdef DOSISH
|| (name[0] && name[1] == ':')
#endif
#ifdef WIN32
|| (name[0] == '\\' && name[1] == '\\') /* UNC path */
#endif
#ifdef VMS
|| (strchr(name,':') || ((*name == '[' || *name == '<') &&
(isALNUM(name[1]) || strchr("$-_]>",name[1]))))
#endif
)
{
tryname = name;
tryrsfp = PerlIO_open(name,PERL_SCRIPT_MODE);
}
else {
AV *ar = GvAVn(PL_incgv);
I32 i;
#ifdef VMS
char *unixname;
if ((unixname = tounixspec(name, Nullch)) != Nullch)
#endif
{
namesv = NEWSV(806, 0);
for (i = 0; i <= AvFILL(ar); i++) {
char *dir = SvPVx(*av_fetch(ar, i, TRUE), n_a);
#ifdef VMS
char *unixdir;
if ((unixdir = tounixpath(dir, Nullch)) == Nullch)
continue;
sv_setpv(namesv, unixdir);
sv_catpv(namesv, unixname);
#else
sv_setpvf(namesv, "%s/%s", dir, name);
#endif
TAINT_PROPER("require");
tryname = SvPVX(namesv);
tryrsfp = PerlIO_open(tryname, PERL_SCRIPT_MODE);
if (tryrsfp) {
if (tryname[0] == '.' && tryname[1] == '/')
tryname += 2;
break;
}
}
}
}
SAVESPTR(PL_compiling.cop_filegv);
PL_compiling.cop_filegv = gv_fetchfile(tryrsfp ? tryname : name);
SvREFCNT_dec(namesv);
if (!tryrsfp) {
if (PL_op->op_type == OP_REQUIRE) {
SV *msg = sv_2mortal(newSVpvf("Can't locate %s in @INC", name));
SV *dirmsgsv = NEWSV(0, 0);
AV *ar = GvAVn(PL_incgv);
I32 i;
if (instr(SvPVX(msg), ".h "))
sv_catpv(msg, " (change .h to .ph maybe?)");
if (instr(SvPVX(msg), ".ph "))
sv_catpv(msg, " (did you run h2ph?)");
sv_catpv(msg, " (@INC contains:");
for (i = 0; i <= AvFILL(ar); i++) {
char *dir = SvPVx(*av_fetch(ar, i, TRUE), n_a);
sv_setpvf(dirmsgsv, " %s", dir);
sv_catsv(msg, dirmsgsv);
}
sv_catpvn(msg, ")", 1);
SvREFCNT_dec(dirmsgsv);
DIE("%_", msg);
}
RETPUSHUNDEF;
}
else
SETERRNO(0, SS$_NORMAL);
/* Assume success here to prevent recursive requirement. */
(void)hv_store(GvHVn(PL_incgv), name, strlen(name),
newSVsv(GvSV(PL_compiling.cop_filegv)), 0 );
ENTER;
SAVETMPS;
lex_start(sv_2mortal(newSVpv("",0)));
SAVEGENERICSV(PL_rsfp_filters);
PL_rsfp_filters = Nullav;
PL_rsfp = tryrsfp;
name = savepv(name);
SAVEFREEPV(name);
SAVEHINTS();
PL_hints = 0;
/* switch to eval mode */
push_return(PL_op->op_next);
PUSHBLOCK(cx, CXt_EVAL, SP);
PUSHEVAL(cx, name, PL_compiling.cop_filegv);
SAVEI16(PL_compiling.cop_line);
PL_compiling.cop_line = 0;
PUTBACK;
#ifdef USE_THREADS
MUTEX_LOCK(&PL_eval_mutex);
if (PL_eval_owner && PL_eval_owner != thr)
while (PL_eval_owner)
COND_WAIT(&PL_eval_cond, &PL_eval_mutex);
PL_eval_owner = thr;
MUTEX_UNLOCK(&PL_eval_mutex);
#endif /* USE_THREADS */
return DOCATCH(doeval(G_SCALAR, NULL));
}
PP(pp_dofile)
{
return pp_require(ARGS);
}
PP(pp_entereval)
{
djSP;
register PERL_CONTEXT *cx;
dPOPss;
I32 gimme = GIMME_V, was = PL_sub_generation;
char tmpbuf[TYPE_DIGITS(long) + 12];
char *safestr;
STRLEN len;
OP *ret;
if (!SvPV(sv,len) || !len)
RETPUSHUNDEF;
TAINT_PROPER("eval");
ENTER;
lex_start(sv);
SAVETMPS;
/* switch to eval mode */
SAVESPTR(PL_compiling.cop_filegv);
sprintf(tmpbuf, "_<(eval %lu)", (unsigned long)++PL_evalseq);
PL_compiling.cop_filegv = gv_fetchfile(tmpbuf+2);
PL_compiling.cop_line = 1;
/* XXX For C<eval "...">s within BEGIN {} blocks, this ends up
deleting the eval's FILEGV from the stash before gv_check() runs
(i.e. before run-time proper). To work around the coredump that
ensues, we always turn GvMULTI_on for any globals that were
introduced within evals. See force_ident(). GSAR 96-10-12 */
safestr = savepv(tmpbuf);
SAVEDELETE(PL_defstash, safestr, strlen(safestr));
SAVEHINTS();
PL_hints = PL_op->op_targ;
push_return(PL_op->op_next);
PUSHBLOCK(cx, (CXt_EVAL|CXp_REAL), SP);
PUSHEVAL(cx, 0, PL_compiling.cop_filegv);
/* prepare to compile string */
if (PERLDB_LINE && PL_curstash != PL_debstash)
save_lines(GvAV(PL_compiling.cop_filegv), PL_linestr);
PUTBACK;
#ifdef USE_THREADS
MUTEX_LOCK(&PL_eval_mutex);
if (PL_eval_owner && PL_eval_owner != thr)
while (PL_eval_owner)
COND_WAIT(&PL_eval_cond, &PL_eval_mutex);
PL_eval_owner = thr;
MUTEX_UNLOCK(&PL_eval_mutex);
#endif /* USE_THREADS */
ret = doeval(gimme, NULL);
if (PERLDB_INTER && was != PL_sub_generation /* Some subs defined here. */
&& ret != PL_op->op_next) { /* Successive compilation. */
strcpy(safestr, "_<(eval )"); /* Anything fake and short. */
}
return DOCATCH(ret);
}
PP(pp_leaveeval)
{
djSP;
register SV **mark;
SV **newsp;
PMOP *newpm;
I32 gimme;
register PERL_CONTEXT *cx;
OP *retop;
U8 save_flags = PL_op -> op_flags;
I32 optype;
POPBLOCK(cx,newpm);
POPEVAL(cx);
retop = pop_return();
TAINT_NOT;
if (gimme == G_VOID)
MARK = newsp;
else if (gimme == G_SCALAR) {
MARK = newsp + 1;
if (MARK <= SP) {
if (SvFLAGS(TOPs) & SVs_TEMP)
*MARK = TOPs;
else
*MARK = sv_mortalcopy(TOPs);
}
else {
MEXTEND(mark,0);
*MARK = &PL_sv_undef;
}
}
else {
/* in case LEAVE wipes old return values */
for (mark = newsp + 1; mark <= SP; mark++) {
if (!(SvFLAGS(*mark) & SVs_TEMP)) {
*mark = sv_mortalcopy(*mark);
TAINT_NOT; /* Each item is independent */
}
}
}
PL_curpm = newpm; /* Don't pop $1 et al till now */
/*
* Closures mentioned at top level of eval cannot be referenced
* again, and their presence indirectly causes a memory leak.
* (Note that the fact that compcv and friends are still set here
* is, AFAIK, an accident.) --Chip
*/
if (AvFILLp(PL_comppad_name) >= 0) {
SV **svp = AvARRAY(PL_comppad_name);
I32 ix;
for (ix = AvFILLp(PL_comppad_name); ix >= 0; ix--) {
SV *sv = svp[ix];
if (sv && sv != &PL_sv_undef && *SvPVX(sv) == '&') {
SvREFCNT_dec(sv);
svp[ix] = &PL_sv_undef;
sv = PL_curpad[ix];
if (CvCLONE(sv)) {
SvREFCNT_dec(CvOUTSIDE(sv));
CvOUTSIDE(sv) = Nullcv;
}
else {
SvREFCNT_dec(sv);
sv = NEWSV(0,0);
SvPADTMP_on(sv);
PL_curpad[ix] = sv;
}
}
}
}
#ifdef DEBUGGING
assert(CvDEPTH(PL_compcv) == 1);
#endif
CvDEPTH(PL_compcv) = 0;
lex_end();
if (optype == OP_REQUIRE &&
!(gimme == G_SCALAR ? SvTRUE(*SP) : SP > newsp))
{
/* Unassume the success we assumed earlier. */
char *name = cx->blk_eval.old_name;
(void)hv_delete(GvHVn(PL_incgv), name, strlen(name), G_DISCARD);
retop = die("%s did not return a true value", name);
/* die_where() did LEAVE, or we won't be here */
}
else {
LEAVE;
if (!(save_flags & OPf_SPECIAL))
sv_setpv(ERRSV,"");
}
RETURNOP(retop);
}
PP(pp_entertry)
{
djSP;
register PERL_CONTEXT *cx;
I32 gimme = GIMME_V;
ENTER;
SAVETMPS;
push_return(cLOGOP->op_other->op_next);
PUSHBLOCK(cx, CXt_EVAL, SP);
PUSHEVAL(cx, 0, 0);
PL_eval_root = PL_op; /* Only needed so that goto works right. */
PL_in_eval = 1;
sv_setpv(ERRSV,"");
PUTBACK;
return DOCATCH(PL_op->op_next);
}
PP(pp_leavetry)
{
djSP;
register SV **mark;
SV **newsp;
PMOP *newpm;
I32 gimme;
register PERL_CONTEXT *cx;
I32 optype;
POPBLOCK(cx,newpm);
POPEVAL(cx);
pop_return();
TAINT_NOT;
if (gimme == G_VOID)
SP = newsp;
else if (gimme == G_SCALAR) {
MARK = newsp + 1;
if (MARK <= SP) {
if (SvFLAGS(TOPs) & (SVs_PADTMP|SVs_TEMP))
*MARK = TOPs;
else
*MARK = sv_mortalcopy(TOPs);
}
else {
MEXTEND(mark,0);
*MARK = &PL_sv_undef;
}
SP = MARK;
}
else {
/* in case LEAVE wipes old return values */
for (mark = newsp + 1; mark <= SP; mark++) {
if (!(SvFLAGS(*mark) & (SVs_PADTMP|SVs_TEMP))) {
*mark = sv_mortalcopy(*mark);
TAINT_NOT; /* Each item is independent */
}
}
}
PL_curpm = newpm; /* Don't pop $1 et al till now */
LEAVE;
sv_setpv(ERRSV,"");
RETURN;
}
STATIC void
doparseform(SV *sv)
{
STRLEN len;
register char *s = SvPV_force(sv, len);
register char *send = s + len;
register char *base;
register I32 skipspaces = 0;
bool noblank;
bool repeat;
bool postspace = FALSE;
U16 *fops;
register U16 *fpc;
U16 *linepc;
register I32 arg;
bool ischop;
if (len == 0)
croak("Null picture in formline");
New(804, fops, (send - s)*3+10, U16); /* Almost certainly too long... */
fpc = fops;
if (s < send) {
linepc = fpc;
*fpc++ = FF_LINEMARK;
noblank = repeat = FALSE;
base = s;
}
while (s <= send) {
switch (*s++) {
default:
skipspaces = 0;
continue;
case '~':
if (*s == '~') {
repeat = TRUE;
*s = ' ';
}
noblank = TRUE;
s[-1] = ' ';
/* FALL THROUGH */
case ' ': case '\t':
skipspaces++;
continue;
case '\n': case 0:
arg = s - base;
skipspaces++;
arg -= skipspaces;
if (arg) {
if (postspace)
*fpc++ = FF_SPACE;
*fpc++ = FF_LITERAL;
*fpc++ = arg;
}
postspace = FALSE;
if (s <= send)
skipspaces--;
if (skipspaces) {
*fpc++ = FF_SKIP;
*fpc++ = skipspaces;
}
skipspaces = 0;
if (s <= send)
*fpc++ = FF_NEWLINE;
if (noblank) {
*fpc++ = FF_BLANK;
if (repeat)
arg = fpc - linepc + 1;
else
arg = 0;
*fpc++ = arg;
}
if (s < send) {
linepc = fpc;
*fpc++ = FF_LINEMARK;
noblank = repeat = FALSE;
base = s;
}
else
s++;
continue;
case '@':
case '^':
ischop = s[-1] == '^';
if (postspace) {
*fpc++ = FF_SPACE;
postspace = FALSE;
}
arg = (s - base) - 1;
if (arg) {
*fpc++ = FF_LITERAL;
*fpc++ = arg;
}
base = s - 1;
*fpc++ = FF_FETCH;
if (*s == '*') {
s++;
*fpc++ = 0;
*fpc++ = FF_LINEGLOB;
}
else if (*s == '#' || (*s == '.' && s[1] == '#')) {
arg = ischop ? 512 : 0;
base = s - 1;
while (*s == '#')
s++;
if (*s == '.') {
char *f;
s++;
f = s;
while (*s == '#')
s++;
arg |= 256 + (s - f);
}
*fpc++ = s - base; /* fieldsize for FETCH */
*fpc++ = FF_DECIMAL;
*fpc++ = arg;
}
else {
I32 prespace = 0;
bool ismore = FALSE;
if (*s == '>') {
while (*++s == '>') ;
prespace = FF_SPACE;
}
else if (*s == '|') {
while (*++s == '|') ;
prespace = FF_HALFSPACE;
postspace = TRUE;
}
else {
if (*s == '<')
while (*++s == '<') ;
postspace = TRUE;
}
if (*s == '.' && s[1] == '.' && s[2] == '.') {
s += 3;
ismore = TRUE;
}
*fpc++ = s - base; /* fieldsize for FETCH */
*fpc++ = ischop ? FF_CHECKCHOP : FF_CHECKNL;
if (prespace)
*fpc++ = prespace;
*fpc++ = FF_ITEM;
if (ismore)
*fpc++ = FF_MORE;
if (ischop)
*fpc++ = FF_CHOP;
}
base = s;
skipspaces = 0;
continue;
}
}
*fpc++ = FF_END;
arg = fpc - fops;
{ /* need to jump to the next word */
int z;
z = WORD_ALIGN - SvCUR(sv) % WORD_ALIGN;
SvGROW(sv, SvCUR(sv) + z + arg * sizeof(U16) + 4);
s = SvPVX(sv) + SvCUR(sv) + z;
}
Copy(fops, s, arg, U16);
Safefree(fops);
sv_magic(sv, Nullsv, 'f', Nullch, 0);
SvCOMPILED_on(sv);
}
/*
* The rest of this file was derived from source code contributed
* by Tom Horsley.
*
* NOTE: this code was derived from Tom Horsley's qsort replacement
* and should not be confused with the original code.
*/
/* Copyright (C) Tom Horsley, 1997. All rights reserved.
Permission granted to distribute under the same terms as perl which are
(briefly):
This program is free software; you can redistribute it and/or modify
it under the terms of either:
a) the GNU General Public License as published by the Free
Software Foundation; either version 1, or (at your option) any
later version, or
b) the "Artistic License" which comes with this Kit.
Details on the perl license can be found in the perl source code which
may be located via the www.perl.com web page.
This is the most wonderfulest possible qsort I can come up with (and
still be mostly portable) My (limited) tests indicate it consistently
does about 20% fewer calls to compare than does the qsort in the Visual
C++ library, other vendors may vary.
Some of the ideas in here can be found in "Algorithms" by Sedgewick,
others I invented myself (or more likely re-invented since they seemed
pretty obvious once I watched the algorithm operate for a while).
Most of this code was written while watching the Marlins sweep the Giants
in the 1997 National League Playoffs - no Braves fans allowed to use this
code (just kidding :-).
I realize that if I wanted to be true to the perl tradition, the only
comment in this file would be something like:
...they shuffled back towards the rear of the line. 'No, not at the
rear!' the slave-driver shouted. 'Three files up. And stay there...
However, I really needed to violate that tradition just so I could keep
track of what happens myself, not to mention some poor fool trying to
understand this years from now :-).
*/
/* ********************************************************** Configuration */
#ifndef QSORT_ORDER_GUESS
#define QSORT_ORDER_GUESS 2 /* Select doubling version of the netBSD trick */
#endif
/* QSORT_MAX_STACK is the largest number of partitions that can be stacked up for
future processing - a good max upper bound is log base 2 of memory size
(32 on 32 bit machines, 64 on 64 bit machines, etc). In reality can
safely be smaller than that since the program is taking up some space and
most operating systems only let you grab some subset of contiguous
memory (not to mention that you are normally sorting data larger than
1 byte element size :-).
*/
#ifndef QSORT_MAX_STACK
#define QSORT_MAX_STACK 32
#endif
/* QSORT_BREAK_EVEN is the size of the largest partition we should insertion sort.
Anything bigger and we use qsort. If you make this too small, the qsort
will probably break (or become less efficient), because it doesn't expect
the middle element of a partition to be the same as the right or left -
you have been warned).
*/
#ifndef QSORT_BREAK_EVEN
#define QSORT_BREAK_EVEN 6
#endif
/* ************************************************************* Data Types */
/* hold left and right index values of a partition waiting to be sorted (the
partition includes both left and right - right is NOT one past the end or
anything like that).
*/
struct partition_stack_entry {
int left;
int right;
#ifdef QSORT_ORDER_GUESS
int qsort_break_even;
#endif
};
/* ******************************************************* Shorthand Macros */
/* Note that these macros will be used from inside the qsort function where
we happen to know that the variable 'elt_size' contains the size of an
array element and the variable 'temp' points to enough space to hold a
temp element and the variable 'array' points to the array being sorted
and 'compare' is the pointer to the compare routine.
Also note that there are very many highly architecture specific ways
these might be sped up, but this is simply the most generally portable
code I could think of.
*/
/* Return < 0 == 0 or > 0 as the value of elt1 is < elt2, == elt2, > elt2
*/
#ifdef PERL_OBJECT
#define qsort_cmp(elt1, elt2) \
((this->*compare)(array[elt1], array[elt2]))
#else
#define qsort_cmp(elt1, elt2) \
((*compare)(array[elt1], array[elt2]))
#endif
#ifdef QSORT_ORDER_GUESS
#define QSORT_NOTICE_SWAP swapped++;
#else
#define QSORT_NOTICE_SWAP
#endif
/* swaps contents of array elements elt1, elt2.
*/
#define qsort_swap(elt1, elt2) \
STMT_START { \
QSORT_NOTICE_SWAP \
temp = array[elt1]; \
array[elt1] = array[elt2]; \
array[elt2] = temp; \
} STMT_END
/* rotate contents of elt1, elt2, elt3 such that elt1 gets elt2, elt2 gets
elt3 and elt3 gets elt1.
*/
#define qsort_rotate(elt1, elt2, elt3) \
STMT_START { \
QSORT_NOTICE_SWAP \
temp = array[elt1]; \
array[elt1] = array[elt2]; \
array[elt2] = array[elt3]; \
array[elt3] = temp; \
} STMT_END
/* ************************************************************ Debug stuff */
#ifdef QSORT_DEBUG
static void
break_here()
{
return; /* good place to set a breakpoint */
}
#define qsort_assert(t) (void)( (t) || (break_here(), 0) )
static void
doqsort_all_asserts(
void * array,
size_t num_elts,
size_t elt_size,
int (*compare)(const void * elt1, const void * elt2),
int pc_left, int pc_right, int u_left, int u_right)
{
int i;
qsort_assert(pc_left <= pc_right);
qsort_assert(u_right < pc_left);
qsort_assert(pc_right < u_left);
for (i = u_right + 1; i < pc_left; ++i) {
qsort_assert(qsort_cmp(i, pc_left) < 0);
}
for (i = pc_left; i < pc_right; ++i) {
qsort_assert(qsort_cmp(i, pc_right) == 0);
}
for (i = pc_right + 1; i < u_left; ++i) {
qsort_assert(qsort_cmp(pc_right, i) < 0);
}
}
#define qsort_all_asserts(PC_LEFT, PC_RIGHT, U_LEFT, U_RIGHT) \
doqsort_all_asserts(array, num_elts, elt_size, compare, \
PC_LEFT, PC_RIGHT, U_LEFT, U_RIGHT)
#else
#define qsort_assert(t) ((void)0)
#define qsort_all_asserts(PC_LEFT, PC_RIGHT, U_LEFT, U_RIGHT) ((void)0)
#endif
/* ****************************************************************** qsort */
STATIC void
#ifdef PERL_OBJECT
qsortsv(SV ** array, size_t num_elts, SVCOMPARE compare)
#else
qsortsv(
SV ** array,
size_t num_elts,
I32 (*compare)(SV *a, SV *b))
#endif
{
register SV * temp;
struct partition_stack_entry partition_stack[QSORT_MAX_STACK];
int next_stack_entry = 0;
int part_left;
int part_right;
#ifdef QSORT_ORDER_GUESS
int qsort_break_even;
int swapped;
#endif
/* Make sure we actually have work to do.
*/
if (num_elts <= 1) {
return;
}
/* Setup the initial partition definition and fall into the sorting loop
*/
part_left = 0;
part_right = (int)(num_elts - 1);
#ifdef QSORT_ORDER_GUESS
qsort_break_even = QSORT_BREAK_EVEN;
#else
#define qsort_break_even QSORT_BREAK_EVEN
#endif
for ( ; ; ) {
if ((part_right - part_left) >= qsort_break_even) {
/* OK, this is gonna get hairy, so lets try to document all the
concepts and abbreviations and variables and what they keep
track of:
pc: pivot chunk - the set of array elements we accumulate in the
middle of the partition, all equal in value to the original
pivot element selected. The pc is defined by:
pc_left - the leftmost array index of the pc
pc_right - the rightmost array index of the pc
we start with pc_left == pc_right and only one element
in the pivot chunk (but it can grow during the scan).
u: uncompared elements - the set of elements in the partition
we have not yet compared to the pivot value. There are two
uncompared sets during the scan - one to the left of the pc
and one to the right.
u_right - the rightmost index of the left side's uncompared set
u_left - the leftmost index of the right side's uncompared set
The leftmost index of the left sides's uncompared set
doesn't need its own variable because it is always defined
by the leftmost edge of the whole partition (part_left). The
same goes for the rightmost edge of the right partition
(part_right).
We know there are no uncompared elements on the left once we
get u_right < part_left and no uncompared elements on the
right once u_left > part_right. When both these conditions
are met, we have completed the scan of the partition.
Any elements which are between the pivot chunk and the
uncompared elements should be less than the pivot value on
the left side and greater than the pivot value on the right
side (in fact, the goal of the whole algorithm is to arrange
for that to be true and make the groups of less-than and
greater-then elements into new partitions to sort again).
As you marvel at the complexity of the code and wonder why it
has to be so confusing. Consider some of the things this level
of confusion brings:
Once I do a compare, I squeeze every ounce of juice out of it. I
never do compare calls I don't have to do, and I certainly never
do redundant calls.
I also never swap any elements unless I can prove there is a
good reason. Many sort algorithms will swap a known value with
an uncompared value just to get things in the right place (or
avoid complexity :-), but that uncompared value, once it gets
compared, may then have to be swapped again. A lot of the
complexity of this code is due to the fact that it never swaps
anything except compared values, and it only swaps them when the
compare shows they are out of position.
*/
int pc_left, pc_right;
int u_right, u_left;
int s;
pc_left = ((part_left + part_right) / 2);
pc_right = pc_left;
u_right = pc_left - 1;
u_left = pc_right + 1;
/* Qsort works best when the pivot value is also the median value
in the partition (unfortunately you can't find the median value
without first sorting :-), so to give the algorithm a helping
hand, we pick 3 elements and sort them and use the median value
of that tiny set as the pivot value.
Some versions of qsort like to use the left middle and right as
the 3 elements to sort so they can insure the ends of the
partition will contain values which will stop the scan in the
compare loop, but when you have to call an arbitrarily complex
routine to do a compare, its really better to just keep track of
array index values to know when you hit the edge of the
partition and avoid the extra compare. An even better reason to
avoid using a compare call is the fact that you can drop off the
edge of the array if someone foolishly provides you with an
unstable compare function that doesn't always provide consistent
results.
So, since it is simpler for us to compare the three adjacent
elements in the middle of the partition, those are the ones we
pick here (conveniently pointed at by u_right, pc_left, and
u_left). The values of the left, center, and right elements
are refered to as l c and r in the following comments.
*/
#ifdef QSORT_ORDER_GUESS
swapped = 0;
#endif
s = qsort_cmp(u_right, pc_left);
if (s < 0) {
/* l < c */
s = qsort_cmp(pc_left, u_left);
/* if l < c, c < r - already in order - nothing to do */
if (s == 0) {
/* l < c, c == r - already in order, pc grows */
++pc_right;
qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
} else if (s > 0) {
/* l < c, c > r - need to know more */
s = qsort_cmp(u_right, u_left);
if (s < 0) {
/* l < c, c > r, l < r - swap c & r to get ordered */
qsort_swap(pc_left, u_left);
qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
} else if (s == 0) {
/* l < c, c > r, l == r - swap c&r, grow pc */
qsort_swap(pc_left, u_left);
--pc_left;
qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
} else {
/* l < c, c > r, l > r - make lcr into rlc to get ordered */
qsort_rotate(pc_left, u_right, u_left);
qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
}
}
} else if (s == 0) {
/* l == c */
s = qsort_cmp(pc_left, u_left);
if (s < 0) {
/* l == c, c < r - already in order, grow pc */
--pc_left;
qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
} else if (s == 0) {
/* l == c, c == r - already in order, grow pc both ways */
--pc_left;
++pc_right;
qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
} else {
/* l == c, c > r - swap l & r, grow pc */
qsort_swap(u_right, u_left);
++pc_right;
qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
}
} else {
/* l > c */
s = qsort_cmp(pc_left, u_left);
if (s < 0) {
/* l > c, c < r - need to know more */
s = qsort_cmp(u_right, u_left);
if (s < 0) {
/* l > c, c < r, l < r - swap l & c to get ordered */
qsort_swap(u_right, pc_left);
qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
} else if (s == 0) {
/* l > c, c < r, l == r - swap l & c, grow pc */
qsort_swap(u_right, pc_left);
++pc_right;
qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
} else {
/* l > c, c < r, l > r - rotate lcr into crl to order */
qsort_rotate(u_right, pc_left, u_left);
qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
}
} else if (s == 0) {
/* l > c, c == r - swap ends, grow pc */
qsort_swap(u_right, u_left);
--pc_left;
qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
} else {
/* l > c, c > r - swap ends to get in order */
qsort_swap(u_right, u_left);
qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
}
}
/* We now know the 3 middle elements have been compared and
arranged in the desired order, so we can shrink the uncompared
sets on both sides
*/
--u_right;
++u_left;
qsort_all_asserts(pc_left, pc_right, u_left, u_right);
/* The above massive nested if was the simple part :-). We now have
the middle 3 elements ordered and we need to scan through the
uncompared sets on either side, swapping elements that are on
the wrong side or simply shuffling equal elements around to get
all equal elements into the pivot chunk.
*/
for ( ; ; ) {
int still_work_on_left;
int still_work_on_right;
/* Scan the uncompared values on the left. If I find a value
equal to the pivot value, move it over so it is adjacent to
the pivot chunk and expand the pivot chunk. If I find a value
less than the pivot value, then just leave it - its already
on the correct side of the partition. If I find a greater
value, then stop the scan.
*/
while (still_work_on_left = (u_right >= part_left)) {
s = qsort_cmp(u_right, pc_left);
if (s < 0) {
--u_right;
} else if (s == 0) {
--pc_left;
if (pc_left != u_right) {
qsort_swap(u_right, pc_left);
}
--u_right;
} else {
break;
}
qsort_assert(u_right < pc_left);
qsort_assert(pc_left <= pc_right);
qsort_assert(qsort_cmp(u_right + 1, pc_left) <= 0);
qsort_assert(qsort_cmp(pc_left, pc_right) == 0);
}
/* Do a mirror image scan of uncompared values on the right
*/
while (still_work_on_right = (u_left <= part_right)) {
s = qsort_cmp(pc_right, u_left);
if (s < 0) {
++u_left;
} else if (s == 0) {
++pc_right;
if (pc_right != u_left) {
qsort_swap(pc_right, u_left);
}
++u_left;
} else {
break;
}
qsort_assert(u_left > pc_right);
qsort_assert(pc_left <= pc_right);
qsort_assert(qsort_cmp(pc_right, u_left - 1) <= 0);
qsort_assert(qsort_cmp(pc_left, pc_right) == 0);
}
if (still_work_on_left) {
/* I know I have a value on the left side which needs to be
on the right side, but I need to know more to decide
exactly the best thing to do with it.
*/
if (still_work_on_right) {
/* I know I have values on both side which are out of
position. This is a big win because I kill two birds
with one swap (so to speak). I can advance the
uncompared pointers on both sides after swapping both
of them into the right place.
*/
qsort_swap(u_right, u_left);
--u_right;
++u_left;
qsort_all_asserts(pc_left, pc_right, u_left, u_right);
} else {
/* I have an out of position value on the left, but the
right is fully scanned, so I "slide" the pivot chunk
and any less-than values left one to make room for the
greater value over on the right. If the out of position
value is immediately adjacent to the pivot chunk (there
are no less-than values), I can do that with a swap,
otherwise, I have to rotate one of the less than values
into the former position of the out of position value
and the right end of the pivot chunk into the left end
(got all that?).
*/
--pc_left;
if (pc_left == u_right) {
qsort_swap(u_right, pc_right);
qsort_all_asserts(pc_left, pc_right-1, u_left, u_right-1);
} else {
qsort_rotate(u_right, pc_left, pc_right);
qsort_all_asserts(pc_left, pc_right-1, u_left, u_right-1);
}
--pc_right;
--u_right;
}
} else if (still_work_on_right) {
/* Mirror image of complex case above: I have an out of
position value on the right, but the left is fully
scanned, so I need to shuffle things around to make room
for the right value on the left.
*/
++pc_right;
if (pc_right == u_left) {
qsort_swap(u_left, pc_left);
qsort_all_asserts(pc_left+1, pc_right, u_left+1, u_right);
} else {
qsort_rotate(pc_right, pc_left, u_left);
qsort_all_asserts(pc_left+1, pc_right, u_left+1, u_right);
}
++pc_left;
++u_left;
} else {
/* No more scanning required on either side of partition,
break out of loop and figure out next set of partitions
*/
break;
}
}
/* The elements in the pivot chunk are now in the right place. They
will never move or be compared again. All I have to do is decide
what to do with the stuff to the left and right of the pivot
chunk.
Notes on the QSORT_ORDER_GUESS ifdef code:
1. If I just built these partitions without swapping any (or
very many) elements, there is a chance that the elements are
already ordered properly (being properly ordered will
certainly result in no swapping, but the converse can't be
proved :-).
2. A (properly written) insertion sort will run faster on
already ordered data than qsort will.
3. Perhaps there is some way to make a good guess about
switching to an insertion sort earlier than partition size 6
(for instance - we could save the partition size on the stack
and increase the size each time we find we didn't swap, thus
switching to insertion sort earlier for partitions with a
history of not swapping).
4. Naturally, if I just switch right away, it will make
artificial benchmarks with pure ascending (or descending)
data look really good, but is that a good reason in general?
Hard to say...
*/
#ifdef QSORT_ORDER_GUESS
if (swapped < 3) {
#if QSORT_ORDER_GUESS == 1
qsort_break_even = (part_right - part_left) + 1;
#endif
#if QSORT_ORDER_GUESS == 2
qsort_break_even *= 2;
#endif
#if QSORT_ORDER_GUESS == 3
int prev_break = qsort_break_even;
qsort_break_even *= qsort_break_even;
if (qsort_break_even < prev_break) {
qsort_break_even = (part_right - part_left) + 1;
}
#endif
} else {
qsort_break_even = QSORT_BREAK_EVEN;
}
#endif
if (part_left < pc_left) {
/* There are elements on the left which need more processing.
Check the right as well before deciding what to do.
*/
if (pc_right < part_right) {
/* We have two partitions to be sorted. Stack the biggest one
and process the smallest one on the next iteration. This
minimizes the stack height by insuring that any additional
stack entries must come from the smallest partition which
(because it is smallest) will have the fewest
opportunities to generate additional stack entries.
*/
if ((part_right - pc_right) > (pc_left - part_left)) {
/* stack the right partition, process the left */
partition_stack[next_stack_entry].left = pc_right + 1;
partition_stack[next_stack_entry].right = part_right;
#ifdef QSORT_ORDER_GUESS
partition_stack[next_stack_entry].qsort_break_even = qsort_break_even;
#endif
part_right = pc_left - 1;
} else {
/* stack the left partition, process the right */
partition_stack[next_stack_entry].left = part_left;
partition_stack[next_stack_entry].right = pc_left - 1;
#ifdef QSORT_ORDER_GUESS
partition_stack[next_stack_entry].qsort_break_even = qsort_break_even;
#endif
part_left = pc_right + 1;
}
qsort_assert(next_stack_entry < QSORT_MAX_STACK);
++next_stack_entry;
} else {
/* The elements on the left are the only remaining elements
that need sorting, arrange for them to be processed as the
next partition.
*/
part_right = pc_left - 1;
}
} else if (pc_right < part_right) {
/* There is only one chunk on the right to be sorted, make it
the new partition and loop back around.
*/
part_left = pc_right + 1;
} else {
/* This whole partition wound up in the pivot chunk, so
we need to get a new partition off the stack.
*/
if (next_stack_entry == 0) {
/* the stack is empty - we are done */
break;
}
--next_stack_entry;
part_left = partition_stack[next_stack_entry].left;
part_right = partition_stack[next_stack_entry].right;
#ifdef QSORT_ORDER_GUESS
qsort_break_even = partition_stack[next_stack_entry].qsort_break_even;
#endif
}
} else {
/* This partition is too small to fool with qsort complexity, just
do an ordinary insertion sort to minimize overhead.
*/
int i;
/* Assume 1st element is in right place already, and start checking
at 2nd element to see where it should be inserted.
*/
for (i = part_left + 1; i <= part_right; ++i) {
int j;
/* Scan (backwards - just in case 'i' is already in right place)
through the elements already sorted to see if the ith element
belongs ahead of one of them.
*/
for (j = i - 1; j >= part_left; --j) {
if (qsort_cmp(i, j) >= 0) {
/* i belongs right after j
*/
break;
}
}
++j;
if (j != i) {
/* Looks like we really need to move some things
*/
int k;
temp = array[i];
for (k = i - 1; k >= j; --k)
array[k + 1] = array[k];
array[j] = temp;
}
}
/* That partition is now sorted, grab the next one, or get out
of the loop if there aren't any more.
*/
if (next_stack_entry == 0) {
/* the stack is empty - we are done */
break;
}
--next_stack_entry;
part_left = partition_stack[next_stack_entry].left;
part_right = partition_stack[next_stack_entry].right;
#ifdef QSORT_ORDER_GUESS
qsort_break_even = partition_stack[next_stack_entry].qsort_break_even;
#endif
}
}
/* Believe it or not, the array is sorted at this point! */
}
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