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perl.c
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perl.c
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/* perl.c
*
* Copyright (c) 1987-1996 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.
*
*/
/*
* "A ship then new they built for him/of mithril and of elven glass" --Bilbo
*/
#include "EXTERN.h"
#include "perl.h"
#include "patchlevel.h"
/* XXX If this causes problems, set i_unistd=undef in the hint file. */
#ifdef I_UNISTD
#include <unistd.h>
#endif
dEXTCONST char rcsid[] = "perl.c\nPatch level: ###\n";
#ifdef IAMSUID
#ifndef DOSUID
#define DOSUID
#endif
#endif
#ifdef SETUID_SCRIPTS_ARE_SECURE_NOW
#ifdef DOSUID
#undef DOSUID
#endif
#endif
#define I_REINIT \
STMT_START { \
chopset = " \n-"; \
copline = NOLINE; \
curcop = &compiling; \
curcopdb = NULL; \
cxstack_ix = -1; \
cxstack_max = 128; \
dbargs = 0; \
dlmax = 128; \
laststatval = -1; \
laststype = OP_STAT; \
maxscream = -1; \
maxsysfd = MAXSYSFD; \
statname = Nullsv; \
tmps_floor = -1; \
tmps_ix = -1; \
op_mask = NULL; \
dlmax = 128; \
laststatval = -1; \
laststype = OP_STAT; \
} STMT_END
static void find_beginning _((void));
static void forbid_setid _((char *));
static void incpush _((char *));
static void init_ids _((void));
static void init_debugger _((void));
static void init_lexer _((void));
static void init_main_stash _((void));
static void init_perllib _((void));
static void init_postdump_symbols _((int, char **, char **));
static void init_predump_symbols _((void));
static void init_stacks _((void));
static void nuke_stacks _((void));
static void open_script _((char *, bool, SV *));
static void usage _((char *));
static void validate_suid _((char *, char*));
static int fdscript = -1;
PerlInterpreter *
perl_alloc()
{
PerlInterpreter *sv_interp;
curinterp = 0;
New(53, sv_interp, 1, PerlInterpreter);
return sv_interp;
}
void
perl_construct( sv_interp )
register PerlInterpreter *sv_interp;
{
if (!(curinterp = sv_interp))
return;
#ifdef MULTIPLICITY
Zero(sv_interp, 1, PerlInterpreter);
#endif
/* Init the real globals? */
if (!linestr) {
linestr = NEWSV(65,80);
sv_upgrade(linestr,SVt_PVIV);
if (!SvREADONLY(&sv_undef)) {
SvREADONLY_on(&sv_undef);
sv_setpv(&sv_no,No);
SvNV(&sv_no);
SvREADONLY_on(&sv_no);
sv_setpv(&sv_yes,Yes);
SvNV(&sv_yes);
SvREADONLY_on(&sv_yes);
}
nrs = newSVpv("\n", 1);
rs = SvREFCNT_inc(nrs);
#ifdef MSDOS
/*
* There is no way we can refer to them from Perl so close them to save
* space. The other alternative would be to provide STDAUX and STDPRN
* filehandles.
*/
(void)fclose(stdaux);
(void)fclose(stdprn);
#endif
}
#ifdef MULTIPLICITY
I_REINIT;
perl_destruct_level = 1;
#else
if(perl_destruct_level > 0)
I_REINIT;
#endif
init_ids();
SET_NUMERIC_STANDARD();
#if defined(SUBVERSION) && SUBVERSION > 0
sprintf(patchlevel, "%7.5f", (double) 5
+ ((double) PATCHLEVEL / (double) 1000)
+ ((double) SUBVERSION / (double) 100000));
#else
sprintf(patchlevel, "%5.3f", (double) 5 +
((double) PATCHLEVEL / (double) 1000));
#endif
#if defined(LOCAL_PATCH_COUNT)
localpatches = local_patches; /* For possible -v */
#endif
PerlIO_init(); /* Hook to IO system */
fdpid = newAV(); /* for remembering popen pids by fd */
pidstatus = newHV();/* for remembering status of dead pids */
init_stacks();
ENTER;
}
void
perl_destruct(sv_interp)
register PerlInterpreter *sv_interp;
{
int destruct_level; /* 0=none, 1=full, 2=full with checks */
I32 last_sv_count;
HV *hv;
if (!(curinterp = sv_interp))
return;
destruct_level = perl_destruct_level;
#ifdef DEBUGGING
{
char *s;
if (s = getenv("PERL_DESTRUCT_LEVEL")) {
int i = atoi(s);
if (destruct_level < i)
destruct_level = i;
}
}
#endif
/* unhook hooks which will soon be, or use, destroyed data */
SvREFCNT_dec(warnhook);
warnhook = Nullsv;
SvREFCNT_dec(diehook);
diehook = Nullsv;
SvREFCNT_dec(parsehook);
parsehook = Nullsv;
LEAVE;
FREETMPS;
/* We must account for everything. First the syntax tree. */
if (main_root) {
curpad = AvARRAY(comppad);
op_free(main_root);
main_root = 0;
}
if (sv_objcount) {
/*
* Try to destruct global references. We do this first so that the
* destructors and destructees still exist. Some sv's might remain.
* Non-referenced objects are on their own.
*/
dirty = TRUE;
sv_clean_objs();
}
if (destruct_level == 0){
DEBUG_P(debprofdump());
/* The exit() function will do everything that needs doing. */
return;
}
/* loosen bonds of global variables */
if(rsfp) {
(void)PerlIO_close(rsfp);
rsfp = Nullfp;
}
/* Filters for program text */
SvREFCNT_dec(rsfp_filters);
rsfp_filters = Nullav;
/* switches */
preprocess = FALSE;
minus_n = FALSE;
minus_p = FALSE;
minus_l = FALSE;
minus_a = FALSE;
minus_F = FALSE;
doswitches = FALSE;
dowarn = FALSE;
doextract = FALSE;
sawampersand = FALSE; /* must save all match strings */
sawstudy = FALSE; /* do fbm_instr on all strings */
sawvec = FALSE;
unsafe = FALSE;
Safefree(inplace);
inplace = Nullch;
Safefree(e_tmpname);
e_tmpname = Nullch;
if (e_fp) {
PerlIO_close(e_fp);
e_fp = Nullfp;
}
/* magical thingies */
Safefree(ofs); /* $, */
ofs = Nullch;
Safefree(ors); /* $\ */
ors = Nullch;
SvREFCNT_dec(nrs); /* $\ helper */
nrs = Nullsv;
multiline = 0; /* $* */
SvREFCNT_dec(statname);
statname = Nullsv;
statgv = Nullgv;
/* defgv, aka *_ should be taken care of elsewhere */
#if 0 /* just about all regexp stuff, seems to be ok */
/* shortcuts to regexp stuff */
leftgv = Nullgv;
ampergv = Nullgv;
SAVEFREEOP(curpm);
SAVEFREEOP(oldlastpm); /* for saving regexp context during debugger */
regprecomp = NULL; /* uncompiled string. */
regparse = NULL; /* Input-scan pointer. */
regxend = NULL; /* End of input for compile */
regnpar = 0; /* () count. */
regcode = NULL; /* Code-emit pointer; ®dummy = don't. */
regsize = 0; /* Code size. */
regnaughty = 0; /* How bad is this pattern? */
regsawback = 0; /* Did we see \1, ...? */
reginput = NULL; /* String-input pointer. */
regbol = NULL; /* Beginning of input, for ^ check. */
regeol = NULL; /* End of input, for $ check. */
regstartp = (char **)NULL; /* Pointer to startp array. */
regendp = (char **)NULL; /* Ditto for endp. */
reglastparen = 0; /* Similarly for lastparen. */
regtill = NULL; /* How far we are required to go. */
regflags = 0; /* are we folding, multilining? */
regprev = (char)NULL; /* char before regbol, \n if none */
#endif /* if 0 */
/* clean up after study() */
SvREFCNT_dec(lastscream);
lastscream = Nullsv;
Safefree(screamfirst);
screamfirst = 0;
Safefree(screamnext);
screamnext = 0;
/* startup and shutdown function lists */
SvREFCNT_dec(beginav);
SvREFCNT_dec(endav);
beginav = Nullav;
endav = Nullav;
/* pid-to-status mappings for waitpid */
SvREFCNT_dec(pidstatus);
pidstatus = Nullhv;
/* temp stack during pp_sort() */
SvREFCNT_dec(sortstack);
sortstack = Nullav;
/* shortcuts just get cleared */
envgv = Nullgv;
siggv = Nullgv;
incgv = Nullgv;
errgv = Nullgv;
argvgv = Nullgv;
argvoutgv = Nullgv;
stdingv = Nullgv;
last_in_gv = Nullgv;
/* reset so print() ends up where we expect */
setdefout(Nullgv);
/* Prepare to destruct main symbol table. */
hv = defstash;
defstash = 0;
SvREFCNT_dec(hv);
FREETMPS;
if (destruct_level >= 2) {
if (scopestack_ix != 0)
warn("Unbalanced scopes: %d more ENTERs than LEAVEs\n", scopestack_ix);
if (savestack_ix != 0)
warn("Unbalanced saves: %d more saves than restores\n", savestack_ix);
if (tmps_floor != -1)
warn("Unbalanced tmps: %d more allocs than frees\n", tmps_floor + 1);
if (cxstack_ix != -1)
warn("Unbalanced context: %d more PUSHes than POPs\n", cxstack_ix + 1);
}
/* Now absolutely destruct everything, somehow or other, loops or no. */
last_sv_count = 0;
SvFLAGS(strtab) |= SVTYPEMASK; /* don't clean out strtab now */
while (sv_count != 0 && sv_count != last_sv_count) {
last_sv_count = sv_count;
sv_clean_all();
}
SvFLAGS(strtab) &= ~SVTYPEMASK;
SvFLAGS(strtab) |= SVt_PVHV;
/* Destruct the global string table. */
{
/* Yell and reset the HeVAL() slots that are still holding refcounts,
* so that sv_free() won't fail on them.
*/
I32 riter;
I32 max;
HE *hent;
HE **array;
riter = 0;
max = HvMAX(strtab);
array = HvARRAY(strtab);
hent = array[0];
for (;;) {
if (hent) {
warn("Unbalanced string table refcount: (%d) for \"%s\"",
HeVAL(hent) - Nullsv, HeKEY(hent));
HeVAL(hent) = Nullsv;
hent = HeNEXT(hent);
}
if (!hent) {
if (++riter > max)
break;
hent = array[riter];
}
}
}
SvREFCNT_dec(strtab);
if (sv_count != 0)
warn("Scalars leaked: %d\n", sv_count);
sv_free_arenas();
linestr = NULL; /* No SVs have survived, need to clean out */
if (origfilename)
Safefree(origfilename);
nuke_stacks();
hints = 0; /* Reset hints. Should hints be per-interpreter ? */
DEBUG_P(debprofdump());
}
void
perl_free(sv_interp)
PerlInterpreter *sv_interp;
{
if (!(curinterp = sv_interp))
return;
Safefree(sv_interp);
}
#if !defined(STANDARD_C) && !defined(HAS_GETENV_PROTOTYPE)
char *getenv _((char *)); /* Usually in <stdlib.h> */
#endif
int
perl_parse(sv_interp, xsinit, argc, argv, env)
PerlInterpreter *sv_interp;
void (*xsinit)_((void));
int argc;
char **argv;
char **env;
{
register SV *sv;
register char *s;
char *scriptname = NULL;
VOL bool dosearch = FALSE;
char *validarg = "";
AV* comppadlist;
#ifdef SETUID_SCRIPTS_ARE_SECURE_NOW
#ifdef IAMSUID
#undef IAMSUID
croak("suidperl is no longer needed since the kernel can now execute\n\
setuid perl scripts securely.\n");
#endif
#endif
if (!(curinterp = sv_interp))
return 255;
#if defined(NeXT) && defined(__DYNAMIC__)
_dyld_lookup_and_bind
("__environ", (unsigned long *) &environ_pointer, NULL);
#endif /* environ */
origargv = argv;
origargc = argc;
#ifndef VMS /* VMS doesn't have environ array */
origenviron = environ;
#endif
e_tmpname = Nullch;
if (do_undump) {
/* Come here if running an undumped a.out. */
origfilename = savepv(argv[0]);
do_undump = FALSE;
cxstack_ix = -1; /* start label stack again */
init_ids();
init_postdump_symbols(argc,argv,env);
return 0;
}
if (main_root)
op_free(main_root);
main_root = 0;
switch (Sigsetjmp(top_env,1)) {
case 1:
#ifdef VMS
statusvalue = 255;
#else
statusvalue = 1;
#endif
case 2:
curstash = defstash;
if (endav)
calllist(endav);
return(statusvalue); /* my_exit() was called */
case 3:
PerlIO_printf(PerlIO_stderr(), "panic: top_env\n");
return 1;
}
sv_setpvn(linestr,"",0);
sv = newSVpv("",0); /* first used for -I flags */
SAVEFREESV(sv);
init_main_stash();
for (argc--,argv++; argc > 0; argc--,argv++) {
if (argv[0][0] != '-' || !argv[0][1])
break;
#ifdef DOSUID
if (*validarg)
validarg = " PHOOEY ";
else
validarg = argv[0];
#endif
s = argv[0]+1;
reswitch:
switch (*s) {
case '0':
case 'F':
case 'a':
case 'c':
case 'd':
case 'D':
case 'h':
case 'i':
case 'l':
case 'M':
case 'm':
case 'n':
case 'p':
case 's':
case 'T':
case 'u':
case 'U':
case 'v':
case 'w':
if (s = moreswitches(s))
goto reswitch;
break;
case 'e':
if (euid != uid || egid != gid)
croak("No -e allowed in setuid scripts");
if (!e_fp) {
e_tmpname = savepv(TMPPATH);
(void)mktemp(e_tmpname);
if (!*e_tmpname)
croak("Can't mktemp()");
e_fp = PerlIO_open(e_tmpname,"w");
if (!e_fp)
croak("Cannot open temporary file");
}
if (*++s)
PerlIO_puts(e_fp,s);
else if (argv[1]) {
PerlIO_puts(e_fp,argv[1]);
argc--,argv++;
}
else
croak("No code specified for -e");
(void)PerlIO_putc(e_fp,'\n');
break;
case 'I':
forbid_setid("-I");
sv_catpv(sv,"-");
sv_catpv(sv,s);
sv_catpv(sv," ");
if (*++s) {
av_push(GvAVn(incgv),newSVpv(s,0));
}
else if (argv[1]) {
av_push(GvAVn(incgv),newSVpv(argv[1],0));
sv_catpv(sv,argv[1]);
argc--,argv++;
sv_catpv(sv," ");
}
break;
case 'P':
forbid_setid("-P");
preprocess = TRUE;
s++;
goto reswitch;
case 'S':
forbid_setid("-S");
dosearch = TRUE;
s++;
goto reswitch;
case 'V':
if (!preambleav)
preambleav = newAV();
av_push(preambleav, newSVpv("use Config qw(myconfig config_vars)",0));
if (*++s != ':') {
Sv = newSVpv("print myconfig();",0);
#ifdef VMS
sv_catpv(Sv,"print \"\\nCharacteristics of this PERLSHR image: \\n\",");
#else
sv_catpv(Sv,"print \"\\nCharacteristics of this binary (from libperl): \\n\",");
#endif
#if defined(DEBUGGING) || defined(NOEMBED) || defined(MULTIPLICITY)
strcpy(buf,"\" Compile-time options:");
# ifdef DEBUGGING
strcat(buf," DEBUGGING");
# endif
# ifdef NOEMBED
strcat(buf," NOEMBED");
# endif
# ifdef MULTIPLICITY
strcat(buf," MULTIPLICITY");
# endif
strcat(buf,"\\n\",");
sv_catpv(Sv,buf);
#endif
#if defined(LOCAL_PATCH_COUNT)
if (LOCAL_PATCH_COUNT > 0)
{ int i;
sv_catpv(Sv,"print \" Locally applied patches:\\n\",");
for (i = 1; i <= LOCAL_PATCH_COUNT; i++) {
if (localpatches[i]) {
sprintf(buf,"\" \\t%s\\n\",",localpatches[i]);
sv_catpv(Sv,buf);
}
}
}
#endif
sprintf(buf,"\" Built under %s\\n\",",OSNAME);
sv_catpv(Sv,buf);
#ifdef __DATE__
# ifdef __TIME__
sprintf(buf,"\" Compiled at %s %s\\n\"",__DATE__,__TIME__);
# else
sprintf(buf,"\" Compiled on %s\\n\"",__DATE__);
# endif
sv_catpv(Sv,buf);
#endif
sv_catpv(Sv,"; $\"=\"\\n \"; print \" \\@INC:\\n @INC\\n\"");
}
else {
Sv = newSVpv("config_vars(qw(",0);
sv_catpv(Sv, ++s);
sv_catpv(Sv, "))");
s += strlen(s);
}
av_push(preambleav, Sv);
scriptname = BIT_BUCKET; /* don't look for script or read stdin */
goto reswitch;
case 'x':
doextract = TRUE;
s++;
if (*s)
cddir = savepv(s);
break;
case '-':
argc--,argv++;
goto switch_end;
case 0:
break;
default:
croak("Unrecognized switch: -%s",s);
}
}
switch_end:
if (!scriptname)
scriptname = argv[0];
if (e_fp) {
if (PerlIO_flush(e_fp) || PerlIO_error(e_fp) || PerlIO_close(e_fp))
croak("Can't write to temp file for -e: %s", Strerror(errno));
e_fp = Nullfp;
argc++,argv--;
scriptname = e_tmpname;
}
else if (scriptname == Nullch) {
#ifdef MSDOS
if ( isatty(PerlIO_fileno(PerlIO_stdin())) )
moreswitches("h");
#endif
scriptname = "-";
}
init_perllib();
open_script(scriptname,dosearch,sv);
validate_suid(validarg, scriptname);
if (doextract)
find_beginning();
compcv = (CV*)NEWSV(1104,0);
sv_upgrade((SV *)compcv, SVt_PVCV);
CvUNIQUE_on(compcv);
comppad = newAV();
av_push(comppad, Nullsv);
curpad = AvARRAY(comppad);
comppad_name = newAV();
comppad_name_fill = 0;
min_intro_pending = 0;
padix = 0;
comppadlist = newAV();
AvREAL_off(comppadlist);
av_store(comppadlist, 0, (SV*)comppad_name);
av_store(comppadlist, 1, (SV*)comppad);
CvPADLIST(compcv) = comppadlist;
boot_core_UNIVERSAL();
if (xsinit)
(*xsinit)(); /* in case linked C routines want magical variables */
#ifdef VMS
init_os_extras();
#endif
init_predump_symbols();
if (!do_undump)
init_postdump_symbols(argc,argv,env);
init_lexer();
/* now parse the script */
error_count = 0;
if (yyparse() || error_count) {
if (minus_c)
croak("%s had compilation errors.\n", origfilename);
else {
croak("Execution of %s aborted due to compilation errors.\n",
origfilename);
}
}
curcop->cop_line = 0;
curstash = defstash;
preprocess = FALSE;
if (e_tmpname) {
(void)UNLINK(e_tmpname);
Safefree(e_tmpname);
e_tmpname = Nullch;
}
/* now that script is parsed, we can modify record separator */
SvREFCNT_dec(rs);
rs = SvREFCNT_inc(nrs);
sv_setsv(GvSV(gv_fetchpv("/", TRUE, SVt_PV)), rs);
if (do_undump)
my_unexec();
if (dowarn)
gv_check(defstash);
LEAVE;
FREETMPS;
#ifdef DEBUGGING_MSTATS
if ((s=getenv("PERL_DEBUG_MSTATS")) && atoi(s) >= 2)
dump_mstats("after compilation:");
#endif
ENTER;
restartop = 0;
return 0;
}
int
perl_run(sv_interp)
PerlInterpreter *sv_interp;
{
if (!(curinterp = sv_interp))
return 255;
switch (Sigsetjmp(top_env,1)) {
case 1:
cxstack_ix = -1; /* start context stack again */
break;
case 2:
curstash = defstash;
if (endav)
calllist(endav);
FREETMPS;
#ifdef DEBUGGING_MSTATS
if (getenv("PERL_DEBUG_MSTATS"))
dump_mstats("after execution: ");
#endif
return(statusvalue); /* my_exit() was called */
case 3:
if (!restartop) {
PerlIO_printf(PerlIO_stderr(), "panic: restartop\n");
FREETMPS;
return 1;
}
if (curstack != mainstack) {
dSP;
SWITCHSTACK(curstack, mainstack);
}
break;
}
DEBUG_r(PerlIO_printf(PerlIO_stderr(), "%s $` $& $' support.\n",
sawampersand ? "Enabling" : "Omitting"));
if (!restartop) {
DEBUG_x(dump_all());
DEBUG(PerlIO_printf(Perl_debug_log, "\nEXECUTING...\n\n"));
if (minus_c) {
PerlIO_printf(PerlIO_stderr(), "%s syntax OK\n", origfilename);
my_exit(0);
}
if (perldb && DBsingle)
sv_setiv(DBsingle, 1);
}
/* do it */
if (restartop) {
op = restartop;
restartop = 0;
runops();
}
else if (main_start) {
op = main_start;
runops();
}
my_exit(0);
return 0;
}
void
my_exit(status)
U32 status;
{
register CONTEXT *cx;
I32 gimme;
SV **newsp;
statusvalue = FIXSTATUS(status);
if (cxstack_ix >= 0) {
if (cxstack_ix > 0)
dounwind(0);
POPBLOCK(cx,curpm);
LEAVE;
}
Siglongjmp(top_env, 2);
}
SV*
perl_get_sv(name, create)
char* name;
I32 create;
{
GV* gv = gv_fetchpv(name, create, SVt_PV);
if (gv)
return GvSV(gv);
return Nullsv;
}
AV*
perl_get_av(name, create)
char* name;
I32 create;
{
GV* gv = gv_fetchpv(name, create, SVt_PVAV);
if (create)
return GvAVn(gv);
if (gv)
return GvAV(gv);
return Nullav;
}
HV*
perl_get_hv(name, create)
char* name;
I32 create;
{
GV* gv = gv_fetchpv(name, create, SVt_PVHV);
if (create)
return GvHVn(gv);
if (gv)
return GvHV(gv);
return Nullhv;
}
CV*
perl_get_cv(name, create)
char* name;
I32 create;
{
GV* gv = gv_fetchpv(name, create, SVt_PVCV);
if (create && !GvCVu(gv))
return newSUB(start_subparse(),
newSVOP(OP_CONST, 0, newSVpv(name,0)),
Nullop,
Nullop);
if (gv)
return GvCVu(gv);
return Nullcv;
}
/* Be sure to refetch the stack pointer after calling these routines. */
I32
perl_call_argv(subname, flags, argv)
char *subname;
I32 flags; /* See G_* flags in cop.h */
register char **argv; /* null terminated arg list */
{
dSP;
PUSHMARK(sp);
if (argv) {
while (*argv) {
XPUSHs(sv_2mortal(newSVpv(*argv,0)));
argv++;
}
PUTBACK;
}
return perl_call_pv(subname, flags);
}
I32
perl_call_pv(subname, flags)
char *subname; /* name of the subroutine */
I32 flags; /* See G_* flags in cop.h */
{
return perl_call_sv((SV*)perl_get_cv(subname, TRUE), flags);
}
I32
perl_call_method(methname, flags)
char *methname; /* name of the subroutine */
I32 flags; /* See G_* flags in cop.h */
{
dSP;
OP myop;
if (!op)
op = &myop;
XPUSHs(sv_2mortal(newSVpv(methname,0)));
PUTBACK;
pp_method();
return perl_call_sv(*stack_sp--, flags);
}
/* May be called with any of a CV, a GV, or an SV containing the name. */
I32
perl_call_sv(sv, flags)
SV* sv;
I32 flags; /* See G_* flags in cop.h */
{
LOGOP myop; /* fake syntax tree node */
SV** sp = stack_sp;
I32 oldmark = TOPMARK;
I32 retval;
Sigjmp_buf oldtop;
I32 oldscope;
static CV *DBcv;
if (flags & G_DISCARD) {
ENTER;
SAVETMPS;
}
SAVESPTR(op);
op = (OP*)&myop;
Zero(op, 1, LOGOP);
EXTEND(stack_sp, 1);
*++stack_sp = sv;
oldscope = scopestack_ix;
if (!(flags & G_NOARGS))
myop.op_flags = OPf_STACKED;
myop.op_next = Nullop;
myop.op_flags |= OPf_KNOW;
if (flags & G_ARRAY)
myop.op_flags |= OPf_LIST;
if (perldb && curstash != debstash
/* Handle first BEGIN of -d. */
&& (DBcv || (DBcv = GvCV(DBsub)))
/* Try harder, since this may have been a sighandler, thus
* curstash may be meaningless. */
&& (SvTYPE(sv) != SVt_PVCV || CvSTASH((CV*)sv) != debstash))
op->op_private |= OPpENTERSUB_DB;
if (flags & G_EVAL) {
Copy(top_env, oldtop, 1, Sigjmp_buf);
cLOGOP->op_other = op;
markstack_ptr--;
/* we're trying to emulate pp_entertry() here */
{
register CONTEXT *cx;
I32 gimme = GIMME;
ENTER;
SAVETMPS;
push_return(op->op_next);
PUSHBLOCK(cx, CXt_EVAL, stack_sp);
PUSHEVAL(cx, 0, 0);
eval_root = op; /* Only needed so that goto works right. */
in_eval = 1;
if (flags & G_KEEPERR)
in_eval |= 4;
else