1 |
#include "EXTERN.h" |
2 |
#include "perl.h" |
3 |
#include "XSUB.h" |
4 |
|
5 |
#if 1 |
6 |
# define CHK(x) (void *)0 |
7 |
#else |
8 |
# define CHK(x) if (!(x)) croak("FATAL, CHK: " #x) |
9 |
#endif |
10 |
|
11 |
#define MAY_FLUSH /* increases codesize */ |
12 |
|
13 |
#define SAVE_DEFAV 0x00000001 |
14 |
#define SAVE_DEFSV 0x00000002 |
15 |
#define SAVE_ERRSV 0x00000004 |
16 |
|
17 |
#define SAVE_ALL -1 |
18 |
|
19 |
struct coro { |
20 |
/* optionally saved, might be zero */ |
21 |
AV *defav; |
22 |
SV *defsv; |
23 |
SV *errsv; |
24 |
|
25 |
/* saved global state not related to stacks */ |
26 |
U8 dowarn; |
27 |
|
28 |
/* the stacks and related info (callchain etc..) */ |
29 |
PERL_SI *curstackinfo; |
30 |
AV *curstack; |
31 |
AV *mainstack; |
32 |
SV **stack_sp; |
33 |
OP *op; |
34 |
SV **curpad; |
35 |
SV **stack_base; |
36 |
SV **stack_max; |
37 |
SV **tmps_stack; |
38 |
I32 tmps_floor; |
39 |
I32 tmps_ix; |
40 |
I32 tmps_max; |
41 |
I32 *markstack; |
42 |
I32 *markstack_ptr; |
43 |
I32 *markstack_max; |
44 |
I32 *scopestack; |
45 |
I32 scopestack_ix; |
46 |
I32 scopestack_max; |
47 |
ANY *savestack; |
48 |
I32 savestack_ix; |
49 |
I32 savestack_max; |
50 |
OP **retstack; |
51 |
I32 retstack_ix; |
52 |
I32 retstack_max; |
53 |
COP *curcop; |
54 |
|
55 |
/* data associated with this coroutine (initial args) */ |
56 |
AV *args; |
57 |
}; |
58 |
|
59 |
typedef struct coro *Coro__State; |
60 |
typedef struct coro *Coro__State_or_hashref; |
61 |
|
62 |
static HV *padlist_cache; |
63 |
|
64 |
/* mostly copied from op.c:cv_clone2 */ |
65 |
STATIC AV * |
66 |
clone_padlist (AV *protopadlist) |
67 |
{ |
68 |
AV *av; |
69 |
I32 ix; |
70 |
AV *protopad_name = (AV *) * av_fetch (protopadlist, 0, FALSE); |
71 |
AV *protopad = (AV *) * av_fetch (protopadlist, 1, FALSE); |
72 |
SV **pname = AvARRAY (protopad_name); |
73 |
SV **ppad = AvARRAY (protopad); |
74 |
I32 fname = AvFILLp (protopad_name); |
75 |
I32 fpad = AvFILLp (protopad); |
76 |
AV *newpadlist, *newpad_name, *newpad; |
77 |
SV **npad; |
78 |
|
79 |
newpad_name = newAV (); |
80 |
for (ix = fname; ix >= 0; ix--) |
81 |
av_store (newpad_name, ix, SvREFCNT_inc (pname[ix])); |
82 |
|
83 |
newpad = newAV (); |
84 |
av_fill (newpad, AvFILLp (protopad)); |
85 |
npad = AvARRAY (newpad); |
86 |
|
87 |
newpadlist = newAV (); |
88 |
AvREAL_off (newpadlist); |
89 |
av_store (newpadlist, 0, (SV *) newpad_name); |
90 |
av_store (newpadlist, 1, (SV *) newpad); |
91 |
|
92 |
av = newAV (); /* will be @_ */ |
93 |
av_extend (av, 0); |
94 |
av_store (newpad, 0, (SV *) av); |
95 |
AvFLAGS (av) = AVf_REIFY; |
96 |
|
97 |
for (ix = fpad; ix > 0; ix--) |
98 |
{ |
99 |
SV *namesv = (ix <= fname) ? pname[ix] : Nullsv; |
100 |
if (namesv && namesv != &PL_sv_undef) |
101 |
{ |
102 |
char *name = SvPVX (namesv); /* XXX */ |
103 |
if (SvFLAGS (namesv) & SVf_FAKE || *name == '&') |
104 |
{ /* lexical from outside? */ |
105 |
npad[ix] = SvREFCNT_inc (ppad[ix]); |
106 |
} |
107 |
else |
108 |
{ /* our own lexical */ |
109 |
SV *sv; |
110 |
if (*name == '&') |
111 |
sv = SvREFCNT_inc (ppad[ix]); |
112 |
else if (*name == '@') |
113 |
sv = (SV *) newAV (); |
114 |
else if (*name == '%') |
115 |
sv = (SV *) newHV (); |
116 |
else |
117 |
sv = NEWSV (0, 0); |
118 |
if (!SvPADBUSY (sv)) |
119 |
SvPADMY_on (sv); |
120 |
npad[ix] = sv; |
121 |
} |
122 |
} |
123 |
else if (IS_PADGV (ppad[ix]) || IS_PADCONST (ppad[ix])) |
124 |
{ |
125 |
npad[ix] = SvREFCNT_inc (ppad[ix]); |
126 |
} |
127 |
else |
128 |
{ |
129 |
SV *sv = NEWSV (0, 0); |
130 |
SvPADTMP_on (sv); |
131 |
npad[ix] = sv; |
132 |
} |
133 |
} |
134 |
|
135 |
#if 0 /* return -ENOTUNDERSTOOD */ |
136 |
/* Now that vars are all in place, clone nested closures. */ |
137 |
|
138 |
for (ix = fpad; ix > 0; ix--) { |
139 |
SV* namesv = (ix <= fname) ? pname[ix] : Nullsv; |
140 |
if (namesv |
141 |
&& namesv != &PL_sv_undef |
142 |
&& !(SvFLAGS(namesv) & SVf_FAKE) |
143 |
&& *SvPVX(namesv) == '&' |
144 |
&& CvCLONE(ppad[ix])) |
145 |
{ |
146 |
CV *kid = cv_clone((CV*)ppad[ix]); |
147 |
SvREFCNT_dec(ppad[ix]); |
148 |
CvCLONE_on(kid); |
149 |
SvPADMY_on(kid); |
150 |
npad[ix] = (SV*)kid; |
151 |
} |
152 |
} |
153 |
#endif |
154 |
|
155 |
return newpadlist; |
156 |
} |
157 |
|
158 |
#ifdef MAY_FLUSH |
159 |
STATIC AV * |
160 |
free_padlist (AV *padlist) |
161 |
{ |
162 |
/* may be during global destruction */ |
163 |
if (SvREFCNT(padlist)) |
164 |
{ |
165 |
I32 i = AvFILLp(padlist); |
166 |
while (i >= 0) |
167 |
{ |
168 |
SV **svp = av_fetch(padlist, i--, FALSE); |
169 |
SV *sv = svp ? *svp : Nullsv; |
170 |
if (sv) |
171 |
SvREFCNT_dec(sv); |
172 |
} |
173 |
|
174 |
SvREFCNT_dec((SV*)padlist); |
175 |
} |
176 |
} |
177 |
#endif |
178 |
|
179 |
/* the next two functions merely cache the padlists */ |
180 |
STATIC void |
181 |
get_padlist (CV *cv) |
182 |
{ |
183 |
SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 0); |
184 |
|
185 |
if (he && AvFILLp ((AV *)*he) >= 0) |
186 |
CvPADLIST (cv) = (AV *)av_pop ((AV *)*he); |
187 |
else |
188 |
CvPADLIST (cv) = clone_padlist (CvPADLIST (cv)); |
189 |
} |
190 |
|
191 |
STATIC void |
192 |
put_padlist (CV *cv) |
193 |
{ |
194 |
SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 1); |
195 |
|
196 |
if (SvTYPE (*he) != SVt_PVAV) |
197 |
{ |
198 |
SvREFCNT_dec (*he); |
199 |
*he = (SV *)newAV (); |
200 |
} |
201 |
|
202 |
av_push ((AV *)*he, (SV *)CvPADLIST (cv)); |
203 |
} |
204 |
|
205 |
#ifdef MAY_FLUSH |
206 |
STATIC void |
207 |
flush_padlist_cache () |
208 |
{ |
209 |
HV *hv = padlist_cache; |
210 |
padlist_cache = newHV (); |
211 |
|
212 |
if (hv_iterinit (hv)) |
213 |
{ |
214 |
HE *he; |
215 |
AV *padlist; |
216 |
|
217 |
while (!!(he = hv_iternext (hv))) |
218 |
{ |
219 |
AV *av = (AV *)HeVAL(he); |
220 |
|
221 |
/* casting is fun. */ |
222 |
while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av))) |
223 |
free_padlist (padlist); |
224 |
} |
225 |
} |
226 |
|
227 |
SvREFCNT_dec (hv); |
228 |
} |
229 |
#endif |
230 |
|
231 |
#define SB do { |
232 |
#define SE } while (0) |
233 |
|
234 |
#define LOAD(state) SB load_state(aTHX_ state); SPAGAIN; SE |
235 |
#define SAVE(state,flags) SB PUTBACK; save_state(aTHX_ state,flags); SE |
236 |
|
237 |
#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); SE |
238 |
|
239 |
static void |
240 |
load_state(pTHX_ Coro__State c) |
241 |
{ |
242 |
PL_dowarn = c->dowarn; |
243 |
|
244 |
PL_curstackinfo = c->curstackinfo; |
245 |
PL_curstack = c->curstack; |
246 |
PL_mainstack = c->mainstack; |
247 |
PL_stack_sp = c->stack_sp; |
248 |
PL_op = c->op; |
249 |
PL_curpad = c->curpad; |
250 |
PL_stack_base = c->stack_base; |
251 |
PL_stack_max = c->stack_max; |
252 |
PL_tmps_stack = c->tmps_stack; |
253 |
PL_tmps_floor = c->tmps_floor; |
254 |
PL_tmps_ix = c->tmps_ix; |
255 |
PL_tmps_max = c->tmps_max; |
256 |
PL_markstack = c->markstack; |
257 |
PL_markstack_ptr = c->markstack_ptr; |
258 |
PL_markstack_max = c->markstack_max; |
259 |
PL_scopestack = c->scopestack; |
260 |
PL_scopestack_ix = c->scopestack_ix; |
261 |
PL_scopestack_max = c->scopestack_max; |
262 |
PL_savestack = c->savestack; |
263 |
PL_savestack_ix = c->savestack_ix; |
264 |
PL_savestack_max = c->savestack_max; |
265 |
PL_retstack = c->retstack; |
266 |
PL_retstack_ix = c->retstack_ix; |
267 |
PL_retstack_max = c->retstack_max; |
268 |
PL_curcop = c->curcop; |
269 |
|
270 |
if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav); |
271 |
if (c->defsv) REPLACE_SV (DEFSV , c->defsv); |
272 |
if (c->errsv) REPLACE_SV (ERRSV , c->errsv); |
273 |
|
274 |
{ |
275 |
dSP; |
276 |
CV *cv; |
277 |
|
278 |
/* now do the ugly restore mess */ |
279 |
while ((cv = (CV *)POPs)) |
280 |
{ |
281 |
AV *padlist = (AV *)POPs; |
282 |
|
283 |
if (padlist) |
284 |
{ |
285 |
put_padlist (cv); /* mark this padlist as available */ |
286 |
CvPADLIST(cv) = padlist; |
287 |
#ifdef USE_THREADS |
288 |
/*CvOWNER(cv) = (struct perl_thread *)POPs;*/ |
289 |
#endif |
290 |
} |
291 |
|
292 |
++CvDEPTH(cv); |
293 |
} |
294 |
|
295 |
PUTBACK; |
296 |
} |
297 |
} |
298 |
|
299 |
static void |
300 |
save_state(pTHX_ Coro__State c, int flags) |
301 |
{ |
302 |
{ |
303 |
dSP; |
304 |
I32 cxix = cxstack_ix; |
305 |
PERL_SI *top_si = PL_curstackinfo; |
306 |
PERL_CONTEXT *ccstk = cxstack; |
307 |
|
308 |
/* |
309 |
* the worst thing you can imagine happens first - we have to save |
310 |
* (and reinitialize) all cv's in the whole callchain :( |
311 |
*/ |
312 |
|
313 |
PUSHs (Nullsv); |
314 |
/* this loop was inspired by pp_caller */ |
315 |
for (;;) |
316 |
{ |
317 |
do |
318 |
{ |
319 |
PERL_CONTEXT *cx = &ccstk[cxix--]; |
320 |
|
321 |
if (CxTYPE(cx) == CXt_SUB) |
322 |
{ |
323 |
CV *cv = cx->blk_sub.cv; |
324 |
if (CvDEPTH(cv)) |
325 |
{ |
326 |
#ifdef USE_THREADS |
327 |
/*XPUSHs ((SV *)CvOWNER(cv));*/ |
328 |
/*CvOWNER(cv) = 0;*/ |
329 |
/*error must unlock this cv etc.. etc...*/ |
330 |
#endif |
331 |
EXTEND (SP, CvDEPTH(cv)*2); |
332 |
|
333 |
while (--CvDEPTH(cv)) |
334 |
{ |
335 |
/* this tells the restore code to increment CvDEPTH */ |
336 |
PUSHs (Nullsv); |
337 |
PUSHs ((SV *)cv); |
338 |
} |
339 |
|
340 |
PUSHs ((SV *)CvPADLIST(cv)); |
341 |
PUSHs ((SV *)cv); |
342 |
|
343 |
get_padlist (cv); /* this is a monster */ |
344 |
} |
345 |
} |
346 |
else if (CxTYPE(cx) == CXt_FORMAT) |
347 |
{ |
348 |
/* I never used formats, so how should I know how these are implemented? */ |
349 |
/* my bold guess is as a simple, plain sub... */ |
350 |
croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats"); |
351 |
} |
352 |
} |
353 |
while (cxix >= 0); |
354 |
|
355 |
if (top_si->si_type == PERLSI_MAIN) |
356 |
break; |
357 |
|
358 |
top_si = top_si->si_prev; |
359 |
ccstk = top_si->si_cxstack; |
360 |
cxix = top_si->si_cxix; |
361 |
} |
362 |
|
363 |
PUTBACK; |
364 |
} |
365 |
|
366 |
c->defav = flags & SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0; |
367 |
c->defsv = flags & SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0; |
368 |
c->errsv = flags & SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0; |
369 |
|
370 |
c->dowarn = PL_dowarn; |
371 |
|
372 |
c->curstackinfo = PL_curstackinfo; |
373 |
c->curstack = PL_curstack; |
374 |
c->mainstack = PL_mainstack; |
375 |
c->stack_sp = PL_stack_sp; |
376 |
c->op = PL_op; |
377 |
c->curpad = PL_curpad; |
378 |
c->stack_base = PL_stack_base; |
379 |
c->stack_max = PL_stack_max; |
380 |
c->tmps_stack = PL_tmps_stack; |
381 |
c->tmps_floor = PL_tmps_floor; |
382 |
c->tmps_ix = PL_tmps_ix; |
383 |
c->tmps_max = PL_tmps_max; |
384 |
c->markstack = PL_markstack; |
385 |
c->markstack_ptr = PL_markstack_ptr; |
386 |
c->markstack_max = PL_markstack_max; |
387 |
c->scopestack = PL_scopestack; |
388 |
c->scopestack_ix = PL_scopestack_ix; |
389 |
c->scopestack_max = PL_scopestack_max; |
390 |
c->savestack = PL_savestack; |
391 |
c->savestack_ix = PL_savestack_ix; |
392 |
c->savestack_max = PL_savestack_max; |
393 |
c->retstack = PL_retstack; |
394 |
c->retstack_ix = PL_retstack_ix; |
395 |
c->retstack_max = PL_retstack_max; |
396 |
c->curcop = PL_curcop; |
397 |
} |
398 |
|
399 |
/* |
400 |
* destroy the stacks, the callchain etc... |
401 |
* still there is a memleak of 128 bytes... |
402 |
*/ |
403 |
STATIC void |
404 |
destroy_stacks(pTHX) |
405 |
{ |
406 |
/* is this ugly, I ask? */ |
407 |
while (PL_scopestack_ix) |
408 |
LEAVE; |
409 |
|
410 |
/* sure it is, but more important: is it correct?? :/ */ |
411 |
while (PL_tmps_ix > PL_tmps_floor) /* should only ever be one iteration */ |
412 |
FREETMPS; |
413 |
|
414 |
while (PL_curstackinfo->si_next) |
415 |
PL_curstackinfo = PL_curstackinfo->si_next; |
416 |
|
417 |
while (PL_curstackinfo) |
418 |
{ |
419 |
PERL_SI *p = PL_curstackinfo->si_prev; |
420 |
|
421 |
{ |
422 |
dSP; |
423 |
SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack); |
424 |
PUTBACK; /* possibly superfluous */ |
425 |
} |
426 |
|
427 |
dounwind(-1); |
428 |
|
429 |
SvREFCNT_dec(PL_curstackinfo->si_stack); |
430 |
Safefree(PL_curstackinfo->si_cxstack); |
431 |
Safefree(PL_curstackinfo); |
432 |
PL_curstackinfo = p; |
433 |
} |
434 |
|
435 |
Safefree(PL_tmps_stack); |
436 |
Safefree(PL_markstack); |
437 |
Safefree(PL_scopestack); |
438 |
Safefree(PL_savestack); |
439 |
Safefree(PL_retstack); |
440 |
} |
441 |
|
442 |
#define SUB_INIT "Coro::State::_newcoro" |
443 |
|
444 |
MODULE = Coro::State PACKAGE = Coro::State |
445 |
|
446 |
PROTOTYPES: ENABLE |
447 |
|
448 |
BOOT: |
449 |
HV * stash = gv_stashpvn("Coro::State", 10, TRUE); |
450 |
|
451 |
newCONSTSUB (stash, "SAVE_DEFAV", newSViv (SAVE_DEFAV)); |
452 |
newCONSTSUB (stash, "SAVE_DEFSV", newSViv (SAVE_DEFSV)); |
453 |
newCONSTSUB (stash, "SAVE_ERRSV", newSViv (SAVE_ERRSV)); |
454 |
|
455 |
if (!padlist_cache) |
456 |
padlist_cache = newHV (); |
457 |
|
458 |
Coro::State |
459 |
_newprocess(args) |
460 |
SV * args |
461 |
PROTOTYPE: $ |
462 |
CODE: |
463 |
Coro__State coro; |
464 |
|
465 |
if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV) |
466 |
croak ("Coro::State::_newprocess expects an arrayref"); |
467 |
|
468 |
New (0, coro, 1, struct coro); |
469 |
|
470 |
coro->mainstack = 0; /* actual work is done inside transfer */ |
471 |
coro->args = (AV *)SvREFCNT_inc (SvRV (args)); |
472 |
|
473 |
RETVAL = coro; |
474 |
OUTPUT: |
475 |
RETVAL |
476 |
|
477 |
void |
478 |
transfer(prev, next, flags = SAVE_DEFAV) |
479 |
Coro::State_or_hashref prev |
480 |
Coro::State_or_hashref next |
481 |
int flags |
482 |
CODE: |
483 |
|
484 |
if (prev != next) |
485 |
{ |
486 |
/* |
487 |
* this could be done in newprocess which would lead to |
488 |
* extremely elegant and fast (just SAVE/LOAD) |
489 |
* code here, but lazy allocation of stacks has also |
490 |
* some virtues and the overhead of the if() is nil. |
491 |
*/ |
492 |
if (next->mainstack) |
493 |
{ |
494 |
SAVE (prev, flags); |
495 |
LOAD (next); |
496 |
/* mark this state as in-use */ |
497 |
next->mainstack = 0; |
498 |
next->tmps_ix = -2; |
499 |
} |
500 |
else if (next->tmps_ix == -2) |
501 |
{ |
502 |
croak ("tried to transfer to running coroutine"); |
503 |
} |
504 |
else |
505 |
{ |
506 |
/* |
507 |
* emulate part of the perl startup here. |
508 |
*/ |
509 |
UNOP myop; |
510 |
|
511 |
SAVE (prev, -1); /* first get rid of the old state */ |
512 |
|
513 |
init_stacks (); /* from perl.c */ |
514 |
SPAGAIN; |
515 |
|
516 |
PL_op = (OP *)&myop; |
517 |
/*PL_curcop = 0;*/ |
518 |
SvREFCNT_dec (GvAV (PL_defgv)); |
519 |
GvAV (PL_defgv) = next->args; |
520 |
|
521 |
Zero(&myop, 1, UNOP); |
522 |
myop.op_next = Nullop; |
523 |
myop.op_flags = OPf_WANT_VOID; |
524 |
|
525 |
PUSHMARK(SP); |
526 |
XPUSHs ((SV*)get_cv(SUB_INIT, TRUE)); |
527 |
/* |
528 |
* the next line is slightly wrong, as PL_op->op_next |
529 |
* is actually being executed so we skip the first op. |
530 |
* that doesn't matter, though, since it is only |
531 |
* pp_nextstate and we never return... |
532 |
* ah yes, and I don't care anyways ;) |
533 |
*/ |
534 |
PUTBACK; |
535 |
PL_op = pp_entersub(aTHX); |
536 |
SPAGAIN; |
537 |
|
538 |
ENTER; /* necessary e.g. for dounwind */ |
539 |
} |
540 |
} |
541 |
|
542 |
void |
543 |
DESTROY(coro) |
544 |
Coro::State coro |
545 |
CODE: |
546 |
|
547 |
if (coro->mainstack) |
548 |
{ |
549 |
struct coro temp; |
550 |
|
551 |
SAVE(aTHX_ (&temp), SAVE_ALL); |
552 |
LOAD(aTHX_ coro); |
553 |
|
554 |
destroy_stacks (); |
555 |
|
556 |
LOAD((&temp)); /* this will get rid of defsv etc.. */ |
557 |
} |
558 |
|
559 |
Safefree (coro); |
560 |
|
561 |
void |
562 |
flush() |
563 |
CODE: |
564 |
#ifdef MAY_FLUSH |
565 |
flush_padlist_cache (); |
566 |
#endif |
567 |
|
568 |
|