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