ext/Devel/DProf/DProf.xs

   1 #define PERL_NO_GET_CONTEXT
   2 #include "EXTERN.h"
   3 #include "perl.h"
   4 #include "XSUB.h"
   5
   6 /* For older Perls */
   7 #ifndef dTHR
   8 #  define dTHR int dummy_thr
   9 #endif  /* dTHR */
  10
  11 /*#define DBG_SUB 1      */
  12 /*#define DBG_TIMER 1    */
  13
  14 #ifdef DBG_SUB
  15 #  define DBG_SUB_NOTIFY(A,B) warn(A, B)
  16 #else
  17 #  define DBG_SUB_NOTIFY(A,B)  /* nothing */
  18 #endif
  19
  20 #ifdef DBG_TIMER
  21 #  define DBG_TIMER_NOTIFY(A) warn(A)
  22 #else
  23 #  define DBG_TIMER_NOTIFY(A)  /* nothing */
  24 #endif
  25
  26 /* HZ == clock ticks per second */
  27 #ifdef VMS
  28 #  define HZ ((I32)CLK_TCK)
  29 #  define DPROF_HZ HZ
  30 #  include <starlet.h>  /* prototype for sys$gettim() */
  31 #  define Times(ptr) (dprof_times(aTHX_ ptr))
  32 #else
  33 #  ifndef HZ
  34 #    ifdef CLK_TCK
  35 #      define HZ ((I32)CLK_TCK)
  36 #    else
  37 #      define HZ 60
  38 #    endif
  39 #  endif
  40 #  ifdef OS2                            /* times() has significant overhead */
  41 #    define Times(ptr) (dprof_times(aTHX_ ptr))
  42 #    define INCL_DOSPROFILE
  43 #    define INCL_DOSERRORS
  44 #    include <os2.h>
  45 #    define toLongLong(arg) (*(long long*)&(arg))
  46 #    define DPROF_HZ g_dprof_ticks
  47 #  else
  48 #    define Times(ptr) (times(ptr))
  49 #    define DPROF_HZ HZ
  50 #  endif
  51 #endif
  52
  53 XS(XS_Devel__DProf_END);        /* used by prof_mark() */
  54
  55 /* Everything is built on times(2).  See its manpage for a description
  56  * of the timings.
  57  */
  58
  59 union prof_any {
  60         clock_t tms_utime;  /* cpu time spent in user space */
  61         clock_t tms_stime;  /* cpu time spent in system */
  62         clock_t realtime;   /* elapsed real time, in ticks */
  63         char *name;
  64         U32 id;
  65         opcode ptype;
  66 };
  67
  68 typedef union prof_any PROFANY;
  69
  70 typedef struct {
  71     U32         dprof_ticks;
  72     PerlIO*     fp;             /* pointer to tmon.out file */
  73     long        TIMES_LOCATION; /* Where in the file to store the time totals */
  74     int         SAVE_STACK;     /* How much data to buffer until end of run */
  75     int         prof_pid;       /* pid of profiled process */
  76     struct tms  prof_start;
  77     struct tms  prof_end;
  78     clock_t     rprof_start;    /* elapsed real time ticks */
  79     clock_t     rprof_end;
  80     clock_t     wprof_u;
  81     clock_t     wprof_s;
  82     clock_t     wprof_r;
  83     clock_t     otms_utime;
  84     clock_t     otms_stime;
  85     clock_t     orealtime;
  86     PROFANY*    profstack;
  87     int         profstack_max;
  88     int         profstack_ix;
  89     HV*         cv_hash;
  90     U32         total;
  91     U32         lastid;
  92     U32         default_perldb;
  93     U32         depth;
  94 #ifdef OS2
  95     ULONG       frequ;
  96     long long   start_cnt;
  97 #endif
  98 #ifdef PERL_IMPLICIT_CONTEXT
  99 #  define register
 100     pTHX;
 101 #  undef register
 102 #endif
 103 } prof_state_t;
 104
 105 prof_state_t g_prof_state;
 106
 107 #define g_dprof_ticks           g_prof_state.dprof_ticks
 108 #define g_fp                    g_prof_state.fp
 109 #define g_TIMES_LOCATION        g_prof_state.TIMES_LOCATION
 110 #define g_SAVE_STACK            g_prof_state.SAVE_STACK
 111 #define g_prof_pid              g_prof_state.prof_pid
 112 #define g_prof_start            g_prof_state.prof_start
 113 #define g_prof_end              g_prof_state.prof_end
 114 #define g_rprof_start           g_prof_state.rprof_start
 115 #define g_rprof_end             g_prof_state.rprof_end
 116 #define g_wprof_u               g_prof_state.wprof_u
 117 #define g_wprof_s               g_prof_state.wprof_s
 118 #define g_wprof_r               g_prof_state.wprof_r
 119 #define g_otms_utime            g_prof_state.otms_utime
 120 #define g_otms_stime            g_prof_state.otms_stime
 121 #define g_orealtime             g_prof_state.orealtime
 122 #define g_profstack             g_prof_state.profstack
 123 #define g_profstack_max         g_prof_state.profstack_max
 124 #define g_profstack_ix          g_prof_state.profstack_ix
 125 #define g_cv_hash               g_prof_state.cv_hash
 126 #define g_total                 g_prof_state.total
 127 #define g_lastid                g_prof_state.lastid
 128 #define g_default_perldb        g_prof_state.default_perldb
 129 #define g_depth                 g_prof_state.depth
 130 #ifdef PERL_IMPLICIT_CONTEXT
 131 #  define g_THX                 g_prof_state.aTHX
 132 #endif
 133 #ifdef OS2
 134 #  define g_frequ               g_prof_state.frequ
 135 #  define g_start_cnt           g_prof_state.start_cnt
 136 #endif
 137
 138 clock_t
 139 dprof_times(pTHX_ struct tms *t)
 140 {
 141 #ifdef OS2
 142     ULONG rc;
 143     QWORD cnt;
 144
 145     if (!g_frequ) {
 146         if (CheckOSError(DosTmrQueryFreq(&g_frequ)))
 147             croak("DosTmrQueryFreq: %s", SvPV(perl_get_sv("!",TRUE),na));
 148         else
 149             g_frequ = g_frequ/DPROF_HZ; /* count per tick */
 150         if (CheckOSError(DosTmrQueryTime(&cnt)))
 151             croak("DosTmrQueryTime: %s",
 152                   SvPV(perl_get_sv("!",TRUE),na));
 153         g_start_cnt = toLongLong(cnt);
 154     }
 155
 156     if (CheckOSError(DosTmrQueryTime(&cnt)))
 157             croak("DosTmrQueryTime: %s", SvPV(perl_get_sv("!",TRUE),na));
 158     t->tms_stime = 0;
 159     return (t->tms_utime = (toLongLong(cnt) - g_start_cnt)/g_frequ);
 160 #else           /* !OS2 */
 161 #  ifdef VMS
 162     clock_t retval;
 163     /* Get wall time and convert to 10 ms intervals to
 164      * produce the return value dprof expects */
 165 #    if defined(__DECC) && defined (__ALPHA)
 166 #      include <ints.h>
 167     uint64 vmstime;
 168     _ckvmssts(sys$gettim(&vmstime));
 169     vmstime /= 100000;
 170     retval = vmstime & 0x7fffffff;
 171 #    else
 172     /* (Older hw or ccs don't have an atomic 64-bit type, so we
 173      * juggle 32-bit ints (and a float) to produce a time_t result
 174      * with minimal loss of information.) */
 175     long int vmstime[2],remainder,divisor = 100000;
 176     _ckvmssts(sys$gettim((unsigned long int *)vmstime));
 177     vmstime[1] &= 0x7fff;  /* prevent overflow in EDIV */
 178     _ckvmssts(lib$ediv(&divisor,vmstime,(long int *)&retval,&remainder));
 179 #    endif
 180     /* Fill in the struct tms using the CRTL routine . . .*/
 181     times((tbuffer_t *)t);
 182     return (clock_t) retval;
 183 #  else         /* !VMS && !OS2 */
 184     return times(t);
 185 #  endif
 186 #endif
 187 }
 188
 189 static void
 190 prof_dumpa(pTHX_ opcode ptype, U32 id)
 191 {
 192     if (ptype == OP_LEAVESUB) {
 193         PerlIO_printf(g_fp,"- %"UVxf"\n", (UV)id);
 194     }
 195     else if(ptype == OP_ENTERSUB) {
 196         PerlIO_printf(g_fp,"+ %"UVxf"\n", (UV)id);
 197     }
 198     else if(ptype == OP_GOTO) {
 199         PerlIO_printf(g_fp,"* %"UVxf"\n", (UV)id);
 200     }
 201     else if(ptype == OP_DIE) {
 202         PerlIO_printf(g_fp,"/ %"UVxf"\n", (UV)id);
 203     }
 204     else {
 205         PerlIO_printf(g_fp,"Profiler unknown prof code %d\n", ptype);
 206     }
 207 }
 208
 209 static void
 210 prof_dumps(pTHX_ U32 id, char *pname, char *gname)
 211 {
 212     PerlIO_printf(g_fp,"& %"UVxf" %s %s\n", (UV)id, pname, gname);
 213 }
 214
 215 static void
 216 prof_dumpt(pTHX_ long tms_utime, long tms_stime, long realtime)
 217 {
 218     PerlIO_printf(g_fp,"@ %ld %ld %ld\n", tms_utime, tms_stime, realtime);
 219 }
 220
 221 static void
 222 prof_dump_until(pTHX_ long ix)
 223 {
 224     long base = 0;
 225     struct tms t1, t2;
 226     clock_t realtime1, realtime2;
 227
 228     realtime1 = Times(&t1);
 229
 230     while (base < ix) {
 231         opcode ptype = g_profstack[base++].ptype;
 232         if (ptype == OP_TIME) {
 233             long tms_utime = g_profstack[base++].tms_utime;
 234             long tms_stime = g_profstack[base++].tms_stime;
 235             long realtime = g_profstack[base++].realtime;
 236
 237             prof_dumpt(aTHX_ tms_utime, tms_stime, realtime);
 238         }
 239         else if (ptype == OP_GV) {
 240             U32 id = g_profstack[base++].id;
 241             char *pname = g_profstack[base++].name;
 242             char *gname = g_profstack[base++].name;
 243
 244             prof_dumps(aTHX_ id, pname, gname);
 245         }
 246         else {
 247             U32 id = g_profstack[base++].id;
 248             prof_dumpa(aTHX_ ptype, id);
 249         }
 250     }
 251     PerlIO_flush(g_fp);
 252     realtime2 = Times(&t2);
 253     if (realtime2 != realtime1 || t1.tms_utime != t2.tms_utime
 254         || t1.tms_stime != t2.tms_stime) {
 255         g_wprof_r += realtime2 - realtime1;
 256         g_wprof_u += t2.tms_utime - t1.tms_utime;
 257         g_wprof_s += t2.tms_stime - t1.tms_stime;
 258
 259         PerlIO_printf(g_fp,"+ & Devel::DProf::write\n");
 260         PerlIO_printf(g_fp,"@ %"IVdf" %"IVdf" %"IVdf"\n",
 261                       /* The (IV) casts are one possibility:
 262                        * the Painfully Correct Way would be to
 263                        * have Clock_t_f. */
 264                       (IV)(t2.tms_utime - t1.tms_utime),
 265                       (IV)(t2.tms_stime - t1.tms_stime),
 266                       (IV)(realtime2 - realtime1));
 267         PerlIO_printf(g_fp,"- & Devel::DProf::write\n");
 268         g_otms_utime = t2.tms_utime;
 269         g_otms_stime = t2.tms_stime;
 270         g_orealtime = realtime2;
 271         PerlIO_flush(g_fp);
 272     }
 273 }
 274
 275 static void
 276 prof_mark(pTHX_ opcode ptype)
 277 {
 278     struct tms t;
 279     clock_t realtime, rdelta, udelta, sdelta;
 280     char *name, *pv;
 281     char *hvname;
 282     STRLEN len;
 283     SV *sv;
 284     U32 id;
 285     SV *Sub = GvSV(PL_DBsub);   /* name of current sub */
 286
 287     if (g_SAVE_STACK) {
 288         if (g_profstack_ix + 5 > g_profstack_max) {
 289                 g_profstack_max = g_profstack_max * 3 / 2;
 290                 Renew(g_profstack, g_profstack_max, PROFANY);
 291         }
 292     }
 293
 294     realtime = Times(&t);
 295     rdelta = realtime - g_orealtime;
 296     udelta = t.tms_utime - g_otms_utime;
 297     sdelta = t.tms_stime - g_otms_stime;
 298     if (rdelta || udelta || sdelta) {
 299         if (g_SAVE_STACK) {
 300             g_profstack[g_profstack_ix++].ptype = OP_TIME;
 301             g_profstack[g_profstack_ix++].tms_utime = udelta;
 302             g_profstack[g_profstack_ix++].tms_stime = sdelta;
 303             g_profstack[g_profstack_ix++].realtime = rdelta;
 304         }
 305         else { /* Write it to disk now so's not to eat up core */
 306             if (g_prof_pid == (int)getpid()) {
 307                 prof_dumpt(aTHX_ udelta, sdelta, rdelta);
 308                 PerlIO_flush(g_fp);
 309             }
 310         }
 311         g_orealtime = realtime;
 312         g_otms_stime = t.tms_stime;
 313         g_otms_utime = t.tms_utime;
 314     }
 315
 316     {
 317         SV **svp;
 318         char *gname, *pname;
 319         CV *cv;
 320
 321         cv = INT2PTR(CV*,SvIVX(Sub));
 322         svp = hv_fetch(g_cv_hash, (char*)&cv, sizeof(CV*), TRUE);
 323         if (!SvOK(*svp)) {
 324             GV *gv = CvGV(cv);
 325
 326             sv_setiv(*svp, id = ++g_lastid);
 327             pname = ((GvSTASH(gv) && HvNAME(GvSTASH(gv)))
 328                      ? HvNAME(GvSTASH(gv))
 329                      : "(null)");
 330             gname = GvNAME(gv);
 331             if (CvXSUB(cv) == XS_Devel__DProf_END)
 332                 return;
 333             if (g_SAVE_STACK) { /* Store it for later recording  -JH */
 334                 g_profstack[g_profstack_ix++].ptype = OP_GV;
 335                 g_profstack[g_profstack_ix++].id = id;
 336                 g_profstack[g_profstack_ix++].name = pname;
 337                 g_profstack[g_profstack_ix++].name = gname;
 338             }
 339             else { /* Write it to disk now so's not to eat up core */
 340                 /* Only record the parent's info */
 341                 if (g_prof_pid == (int)getpid()) {
 342                     prof_dumps(aTHX_ id, pname, gname);
 343                     PerlIO_flush(g_fp);
 344                 }
 345                 else
 346                     PL_perldb = 0;              /* Do not debug the kid. */
 347             }
 348         }
 349         else {
 350             id = SvIV(*svp);
 351         }
 352     }
 353
 354     g_total++;
 355     if (g_SAVE_STACK) { /* Store it for later recording  -JH */
 356         g_profstack[g_profstack_ix++].ptype = ptype;
 357         g_profstack[g_profstack_ix++].id = id;
 358
 359         /* Only record the parent's info */
 360         if (g_SAVE_STACK < g_profstack_ix) {
 361             if (g_prof_pid == (int)getpid())
 362                 prof_dump_until(aTHX_ g_profstack_ix);
 363             else
 364                 PL_perldb = 0;          /* Do not debug the kid. */
 365             g_profstack_ix = 0;
 366         }
 367     }
 368     else { /* Write it to disk now so's not to eat up core */
 369
 370         /* Only record the parent's info */
 371         if (g_prof_pid == (int)getpid()) {
 372             prof_dumpa(aTHX_ ptype, id);
 373             PerlIO_flush(g_fp);
 374         }
 375         else
 376             PL_perldb = 0;              /* Do not debug the kid. */
 377     }
 378 }
 379
 380 #ifdef PL_NEEDED
 381 #  define defstash PL_defstash
 382 #endif
 383
 384 /* Counts overhead of prof_mark and extra XS call. */
 385 static void
 386 test_time(pTHX_ clock_t *r, clock_t *u, clock_t *s)
 387 {
 388     dTHR;
 389     CV *cv = perl_get_cv("Devel::DProf::NONESUCH_noxs", FALSE);
 390     int i, j, k = 0;
 391     HV *oldstash = PL_curstash;
 392     struct tms t1, t2;
 393     clock_t realtime1, realtime2;
 394     U32 ototal = g_total;
 395     U32 ostack = g_SAVE_STACK;
 396     U32 operldb = PL_perldb;
 397
 398     g_SAVE_STACK = 1000000;
 399     realtime1 = Times(&t1);
 400
 401     while (k < 2) {
 402         i = 0;
 403             /* Disable debugging of perl_call_sv on second pass: */
 404         PL_curstash = (k == 0 ? PL_defstash : PL_debstash);
 405         PL_perldb = g_default_perldb;
 406         while (++i <= 100) {
 407             j = 0;
 408             g_profstack_ix = 0;         /* Do not let the stack grow */
 409             while (++j <= 100) {
 410 /*              prof_mark(aTHX_ OP_ENTERSUB); */
 411
 412                 PUSHMARK(PL_stack_sp);
 413                 perl_call_sv((SV*)cv, G_SCALAR);
 414                 PL_stack_sp--;
 415 /*              prof_mark(aTHX_ OP_LEAVESUB); */
 416             }
 417         }
 418         PL_curstash = oldstash;
 419         if (k == 0) {                   /* Put time with debugging */
 420             realtime2 = Times(&t2);
 421             *r = realtime2 - realtime1;
 422             *u = t2.tms_utime - t1.tms_utime;
 423             *s = t2.tms_stime - t1.tms_stime;
 424         }
 425         else {                          /* Subtract time without debug */
 426             realtime1 = Times(&t1);
 427             *r -= realtime1 - realtime2;
 428             *u -= t1.tms_utime - t2.tms_utime;
 429             *s -= t1.tms_stime - t2.tms_stime;
 430         }
 431         k++;
 432     }
 433     g_total = ototal;
 434     g_SAVE_STACK = ostack;
 435     PL_perldb = operldb;
 436 }
 437
 438 static void
 439 prof_recordheader(pTHX)
 440 {
 441     clock_t r, u, s;
 442
 443     /* g_fp is opened in the BOOT section */
 444     PerlIO_printf(g_fp, "#fOrTyTwO\n");
 445     PerlIO_printf(g_fp, "$hz=%"IVdf";\n", (IV)DPROF_HZ);
 446     PerlIO_printf(g_fp, "$XS_VERSION='DProf %s';\n", XS_VERSION);
 447     PerlIO_printf(g_fp, "# All values are given in HZ\n");
 448     test_time(aTHX_ &r, &u, &s);
 449     PerlIO_printf(g_fp,
 450                   "$over_utime=%"IVdf"; $over_stime=%"IVdf"; $over_rtime=%"IVdf";\n",
 451                   /* The (IV) casts are one possibility:
 452                    * the Painfully Correct Way would be to
 453                    * have Clock_t_f. */
 454                   (IV)u, (IV)s, (IV)r);
 455     PerlIO_printf(g_fp, "$over_tests=10000;\n");
 456
 457     g_TIMES_LOCATION = PerlIO_tell(g_fp);
 458
 459     /* Pad with whitespace. */
 460     /* This should be enough even for very large numbers. */
 461     PerlIO_printf(g_fp, "%*s\n", 240 , "");
 462
 463     PerlIO_printf(g_fp, "\n");
 464     PerlIO_printf(g_fp, "PART2\n");
 465
 466     PerlIO_flush(g_fp);
 467 }
 468
 469 static void
 470 prof_record(pTHX)
 471 {
 472     /* g_fp is opened in the BOOT section */
 473
 474     /* Now that we know the runtimes, fill them in at the recorded
 475        location -JH */
 476
 477     clock_t r, u, s;
 478
 479     if (g_SAVE_STACK) {
 480         prof_dump_until(aTHX_ g_profstack_ix);
 481     }
 482     PerlIO_seek(g_fp, g_TIMES_LOCATION, SEEK_SET);
 483     /* Write into reserved 240 bytes: */
 484     PerlIO_printf(g_fp,
 485                   "$rrun_utime=%"IVdf"; $rrun_stime=%"IVdf"; $rrun_rtime=%"IVdf";",
 486                   /* The (IV) casts are one possibility:
 487                    * the Painfully Correct Way would be to
 488                    * have Clock_t_f. */
 489                   (IV)(g_prof_end.tms_utime-g_prof_start.tms_utime-g_wprof_u),
 490                   (IV)(g_prof_end.tms_stime-g_prof_start.tms_stime-g_wprof_s),
 491                   (IV)(g_rprof_end-g_rprof_start-g_wprof_r));
 492     PerlIO_printf(g_fp, "\n$total_marks=%"IVdf, (IV)g_total);
 493
 494     PerlIO_close(g_fp);
 495 }
 496
 497 #define NONESUCH()
 498
 499 static void
 500 check_depth(pTHX_ void *foo)
 501 {
 502     U32 need_depth = (U32)foo;
 503     if (need_depth != g_depth) {
 504         if (need_depth > g_depth) {
 505             warn("garbled call depth when profiling");
 506         }
 507         else {
 508             I32 marks = g_depth - need_depth;
 509
 510 /*          warn("Check_depth: got %d, expected %d\n", g_depth, need_depth); */
 511             while (marks--) {
 512                 prof_mark(aTHX_ OP_DIE);
 513             }
 514             g_depth = need_depth;
 515         }
 516     }
 517 }
 518
 519 #define for_real
 520 #ifdef for_real
 521
 522 XS(XS_DB_sub)
 523 {
 524     dXSARGS;
 525     dORIGMARK;
 526     SV *Sub = GvSV(PL_DBsub);           /* name of current sub */
 527
 528 #ifdef PERL_IMPLICIT_CONTEXT
 529     /* profile only the interpreter that loaded us */
 530     if (g_THX != aTHX) {
 531         PUSHMARK(ORIGMARK);
 532         perl_call_sv(INT2PTR(SV*,SvIV(Sub)), GIMME | G_NODEBUG);
 533     }
 534     else
 535 #endif
 536     {
 537         HV *oldstash = PL_curstash;
 538
 539         DBG_SUB_NOTIFY("XS DBsub(%s)\n", SvPV(Sub, na));
 540
 541         SAVEDESTRUCTOR_X(check_depth, (void*)g_depth);
 542         g_depth++;
 543
 544         prof_mark(aTHX_ OP_ENTERSUB);
 545         PUSHMARK(ORIGMARK);
 546         perl_call_sv(INT2PTR(SV*,SvIV(Sub)), GIMME | G_NODEBUG);
 547         prof_mark(aTHX_ OP_LEAVESUB);
 548         g_depth--;
 549     }
 550     return;
 551 }
 552
 553 XS(XS_DB_goto)
 554 {
 555 #ifdef PERL_IMPLICIT_CONTEXT
 556     if (g_THX == aTHX)
 557 #endif
 558     {
 559         prof_mark(aTHX_ OP_GOTO);
 560         return;
 561     }
 562 }
 563
 564 #endif /* for_real */
 565
 566 #ifdef testing
 567
 568         MODULE = Devel::DProf           PACKAGE = DB
 569
 570         void
 571         sub(...)
 572         PPCODE:
 573             {
 574                 dORIGMARK;
 575                 HV *oldstash = PL_curstash;
 576                 SV *Sub = GvSV(PL_DBsub);       /* name of current sub */
 577                 /* SP -= items;  added by xsubpp */
 578                 DBG_SUB_NOTIFY("XS DBsub(%s)\n", SvPV(Sub, na));
 579
 580                 sv_setiv(PL_DBsingle, 0);       /* disable DB single-stepping */
 581
 582                 prof_mark(aTHX_ OP_ENTERSUB);
 583                 PUSHMARK(ORIGMARK);
 584
 585                 PL_curstash = PL_debstash;      /* To disable debugging of perl_call_sv */
 586                 perl_call_sv(Sub, GIMME);
 587                 PL_curstash = oldstash;
 588
 589                 prof_mark(aTHX_ OP_LEAVESUB);
 590                 SPAGAIN;
 591                 /* PUTBACK;  added by xsubpp */
 592             }
 593
 594 #endif /* testing */
 595
 596 MODULE = Devel::DProf           PACKAGE = Devel::DProf
 597
 598 void
 599 END()
 600 PPCODE:
 601     {
 602         if (PL_DBsub) {
 603             /* maybe the process forked--we want only
 604              * the parent's profile.
 605              */
 606             if (
 607 #ifdef PERL_IMPLICIT_CONTEXT
 608                 g_THX == aTHX &&
 609 #endif
 610                 g_prof_pid == (int)getpid())
 611             {
 612                 g_rprof_end = Times(&g_prof_end);
 613                 DBG_TIMER_NOTIFY("Profiler timer is off.\n");
 614                 prof_record(aTHX);
 615             }
 616         }
 617     }
 618
 619 void
 620 NONESUCH()
 621
 622 BOOT:
 623     {
 624         g_TIMES_LOCATION = 42;
 625         g_SAVE_STACK = 1<<14;
 626         g_profstack_max = 128;
 627 #ifdef PERL_IMPLICIT_CONTEXT
 628         g_THX = aTHX;
 629 #endif
 630
 631         /* Before we go anywhere make sure we were invoked
 632          * properly, else we'll dump core.
 633          */
 634         if (!PL_DBsub)
 635             croak("DProf: run perl with -d to use DProf.\n");
 636
 637         /* When we hook up the XS DB::sub we'll be redefining
 638          * the DB::sub from the PM file.  Turn off warnings
 639          * while we do this.
 640          */
 641         {
 642             I32 warn_tmp = PL_dowarn;
 643             PL_dowarn = 0;
 644             newXS("DB::sub", XS_DB_sub, file);
 645             newXS("DB::goto", XS_DB_goto, file);
 646             PL_dowarn = warn_tmp;
 647         }
 648
 649         sv_setiv(PL_DBsingle, 0);       /* disable DB single-stepping */
 650
 651         {
 652             char *buffer = getenv("PERL_DPROF_BUFFER");
 653
 654             if (buffer) {
 655                 g_SAVE_STACK = atoi(buffer);
 656             }
 657
 658             buffer = getenv("PERL_DPROF_TICKS");
 659
 660             if (buffer) {
 661                 g_dprof_ticks = atoi(buffer); /* Used under OS/2 only */
 662             }
 663             else {
 664                 g_dprof_ticks = HZ;
 665             }
 666         }
 667
 668         if ((g_fp = PerlIO_open("tmon.out", "w")) == NULL)
 669             croak("DProf: unable to write tmon.out, errno = %d\n", errno);
 670
 671         g_default_perldb = PERLDBf_NONAME | PERLDBf_SUB | PERLDBf_GOTO;
 672         g_cv_hash = newHV();
 673         g_prof_pid = (int)getpid();
 674
 675         New(0, g_profstack, g_profstack_max, PROFANY);
 676         prof_recordheader(aTHX);
 677         DBG_TIMER_NOTIFY("Profiler timer is on.\n");
 678         g_orealtime = g_rprof_start = Times(&g_prof_start);
 679         g_otms_utime = g_prof_start.tms_utime;
 680         g_otms_stime = g_prof_start.tms_stime;
 681         PL_perldb = g_default_perldb;
 682     }