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/cvs/Faster/Faster.pm
Revision: 1.13
Committed: Fri Mar 10 18:53:49 2006 UTC (18 years, 3 months ago) by root
Branch: MAIN
Changes since 1.12: +5 -1 lines
Log Message:
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File Contents

# Content
1 =head1 NAME
2
3 Faster - do some things faster
4
5 =head1 SYNOPSIS
6
7 use Faster;
8
9 =head1 DESCRIPTION
10
11 =over 4
12
13 =cut
14
15 package Faster;
16
17 use strict;
18 use Config;
19 use B ();
20 use Digest::MD5 ();
21 use DynaLoader ();
22
23 BEGIN {
24 our $VERSION = '0.01';
25
26 require XSLoader;
27 XSLoader::load __PACKAGE__, $VERSION;
28 }
29
30 my $COMPILE = "$Config{cc} -c -I$Config{archlibexp}/CORE $Config{optimize} $Config{ccflags} $Config{cccdlflags}";
31 my $LINK = "$Config{ld} $Config{ldflags} $Config{lddlflags} $Config{ccdlflags}";
32 my $LIBS = "$Config{libs}";
33 my $_o = $Config{_o};
34 my $_so = ".so";
35
36 # we don't need no steenking PIC on x86
37 $COMPILE =~ s/-f(?:PIC|pic)//g
38 if $Config{archname} =~ /^(i[3456]86)-/;
39
40 my $opt_assert = 1;
41
42 our $source;
43
44 my @ops;
45 my $op;
46 my $op_name;
47 my @loop;
48
49 my %flag;
50
51 # complex flag steting is no longer required, rewrite this ugly code
52 for (split /\n/, <<EOF) {
53 leavesub unsafe
54 leavesublv unsafe
55 return unsafe
56 flip unsafe
57 goto unsafe
58 last unsafe
59 redo unsafe
60 next unsafe
61 eval unsafe
62 leaveeval unsafe
63 entertry unsafe
64 formline unsafe
65 grepstart unsafe
66 mapstart unsafe
67 substcont unsafe
68 entereval unsafe noasync todo
69 require unsafe
70
71 mapstart noasync
72 grepstart noasync
73 match noasync
74
75 last noasync
76 next noasync
77 redo noasync
78 seq noasync
79 pushmark noasync extend=0
80 padsv noasync extend=1
81 padav noasync extend=1
82 padhv noasync extend=1
83 padany noasync extend=1
84 entersub noasync
85 aassign noasync
86 sassign noasync
87 rv2av noasync
88 rv2cv noasync
89 rv2gv noasync
90 rv2hv noasync
91 refgen noasync
92 nextstate noasync
93 gv noasync
94 gvsv noasync
95 add noasync
96 subtract noasync
97 multiply noasync
98 divide noasync
99 complement noasync
100 cond_expr noasync
101 and noasync
102 or noasync
103 not noasync
104 defined noasync
105 method_named noasync
106 preinc noasync
107 postinc noasync
108 predec noasync
109 postdec noasync
110 stub noasync
111 unstack noasync
112 leaveloop noasync
113 aelem noasync
114 aelemfast noasync
115 helem noasync
116 pushre noasync
117 subst noasync
118 const noasync extend=1
119 list noasync
120 join noasync
121 split noasync
122 concat noasync
123 push noasync
124 pop noasync
125 shift noasync
126 unshift noasync
127 length noasync
128 substr noasync
129 stringify noasync
130 eq noasync
131 ne noasync
132 gt noasync
133 lt noasync
134 ge noasync
135 le noasync
136 enteriter noasync
137 ord noasync
138
139 iter async
140 EOF
141 my (undef, $op, @flags) = split /\s+/;
142
143 undef $flag{$_}{$op}
144 for ("known", @flags);
145 }
146
147 my %callop = (
148 entersub => "(PL_ppaddr [OP_ENTERSUB]) (aTHX)",
149 mapstart => "Perl_pp_grepstart (aTHX)",
150 );
151
152 sub callop {
153 $callop{$op_name} || "Perl_pp_$op_name (aTHX)"
154 }
155
156 sub assert {
157 return unless $opt_assert;
158 $source .= " assert ((\"$op_name\", ($_[0])));\n";
159 }
160
161 sub out_callop {
162 assert "nextop == (OP *)$$op";
163 $source .= " PL_op = nextop; nextop = " . (callop $op) . ";\n";
164 }
165
166 sub out_jump_next {
167 assert "nextop == (OP *)${$op->next}";
168 $source .= " goto op_${$op->next};\n";
169 }
170
171 sub out_next {
172 $source .= " nextop = (OP *)${$op->next}L;\n";
173
174 out_jump_next;
175 }
176
177 sub out_linear {
178 out_callop;
179 out_jump_next;
180 }
181
182 sub out_cond_jump {
183 $source .= " if (nextop == (OP *)${$_[0]}L) goto op_${$_[0]};\n";
184 }
185
186 sub op_entersub {
187 out_callop;
188 $source .= " RUNOPS_TILL ((OP *)${$op->next}L);\n";
189 out_jump_next;
190 }
191
192 *op_require = \&op_entersub;
193
194 sub op_nextstate {
195 $source .= " PL_curcop = (COP *)nextop;\n";
196 $source .= " PL_stack_sp = PL_stack_base + cxstack[cxstack_ix].blk_oldsp;\n";
197 $source .= " FREETMPS;\n";
198
199 out_next;
200 }
201
202 sub op_pushmark {
203 $source .= " PUSHMARK (PL_stack_sp);\n";
204
205 out_next;
206 }
207
208 if ($Config{useithreads} ne "define") {
209 # disable optimisations on ithreads
210
211 *op_const = sub {
212 $source .= " { dSP; XPUSHs ((SV *)${$op->sv}L); PUTBACK; }\n";
213
214 out_next;
215 };
216
217 *op_gv = \&op_const;
218
219 *op_aelemfast = sub {
220 my $targ = $op->targ;
221 my $private = $op->private;
222
223 $source .= " {\n";
224
225 if ($op->flags & B::OPf_SPECIAL) {
226 $source .= " AV *av = (AV*)PAD_SV((PADOFFSET)$targ);\n";
227 } else {
228 $source .= " AV *av = GvAV ((GV *)${$op->sv}L);\n";
229 }
230
231 if ($op->flags & B::OPf_MOD) {
232 $source .= " SV *sv = *av_fetch (av, $private, 1);\n";
233 } else {
234 $source .= " SV **svp = av_fetch (av, $private, 0); SV *sv = svp ? *svp : &PL_sv_undef;\n";
235 }
236
237 if (!($op->flags & B::OPf_MOD)) {
238 $source .= " if (SvGMAGICAL (sv)) sv = sv_mortalcopy (sv);\n";
239 }
240
241 $source .= " dSP;\n";
242 $source .= " XPUSHs (sv);\n";
243 $source .= " PUTBACK;\n";
244 $source .= " }\n";
245
246 out_next;
247 };
248
249 *op_gvsv = sub {
250 $source .= " {\n";
251 $source .= " dSP;\n";
252 $source .= " EXTEND (SP, 1);\n";
253
254 if ($op->private & B::OPpLVAL_INTRO) {
255 $source .= " PUSHs (save_scalar ((GV *)${$op->sv}L));\n";
256 } else {
257 $source .= " PUSHs (GvSV ((GV *)${$op->sv}L));\n";
258 }
259
260 $source .= " PUTBACK;\n";
261 $source .= " }\n";
262
263 out_next;
264 };
265 }
266
267 # does kill Crossfire/res2pm
268 sub op_stringify {
269 my $targ = $op->targ;
270
271 $source .= <<EOF;
272 {
273 dSP;
274 SV *targ = PAD_SV ((PADOFFSET)$targ);
275 sv_copypv (TARG, TOPs);
276 SETTARG;
277 PUTBACK;
278 }
279 EOF
280
281 out_next;
282 }
283
284 sub op_and {
285 $source .= <<EOF;
286 {
287 dSP;
288
289 if (SvTRUE (TOPs))
290 {
291 --SP;
292 PUTBACK;
293 nextop = (OP *)${$op->other}L;
294 goto op_${$op->other};
295 }
296 }
297 EOF
298
299 out_next;
300 }
301
302 sub op_or {
303 $source .= <<EOF;
304 {
305 dSP;
306
307 if (!SvTRUE (TOPs))
308 {
309 --SP;
310 PUTBACK;
311 nextop = (OP *)${$op->other}L;
312 goto op_${$op->other};
313 }
314 }
315 EOF
316
317 out_next;
318 }
319
320 sub op_padsv {
321 my $flags = $op->flags;
322 my $target = $op->targ;
323
324 $source .= <<EOF;
325 {
326 dSP;
327 XPUSHs (PAD_SV ((PADOFFSET)$target));
328 PUTBACK;
329 EOF
330 if ($op->flags & B::OPf_MOD) {
331 if ($op->private & B::OPpLVAL_INTRO) {
332 $source .= " SAVECLEARSV (PAD_SVl ((PADOFFSET)$target));\n";
333 } elsif ($op->private & B::OPpDEREF) {
334 my $deref = $op->private & B::OPpDEREF;
335 $source .= " Perl_vivify_ref (PAD_SVl ((PADOFFSET)$target), $deref);\n";
336 }
337 }
338 $source .= <<EOF;
339 }
340 EOF
341
342 out_next;
343 }
344
345 # pattern const+ (or general push1)
346 # pattern pushmark return(?)
347 # pattern pushmark gv rv2av pushmark padsv+o.ä. aassign
348
349 # pattern const method_named
350 sub op_method_named {
351 $source .= <<EOF;
352 {
353 static HV *last_stash;
354 static SV *last_cv;
355 static U32 last_sub_generation;
356
357 SV *obj = *(PL_stack_base + TOPMARK + 1);
358
359 if (!SvGMAGICAL (obj) && SvROK (obj) && SvOBJECT (SvRV (obj)))
360 {
361 dSP;
362 HV *stash = SvSTASH (SvRV (obj));
363
364 /* simple "polymorphic" inline cache */
365 if (stash == last_stash
366 && PL_sub_generation == last_sub_generation)
367 {
368 XPUSHs (last_cv);
369 PUTBACK;
370 }
371 else
372 {
373 PL_op = nextop; nextop = Perl_pp_method_named (aTHX);
374
375 SPAGAIN;
376 last_sub_generation = PL_sub_generation;
377 last_stash = stash;
378 last_cv = TOPs;
379 }
380 }
381 else
382 {
383 /* error case usually */
384 PL_op = nextop; nextop = Perl_pp_method_named (aTHX);
385 }
386 }
387 EOF
388
389 out_next;
390 }
391
392 sub op_grepstart {
393 out_callop;
394 out_cond_jump $op->next->other;
395 out_jump_next;
396 }
397
398 *op_mapstart = \&op_grepstart;
399
400 sub op_substcont {
401 out_callop;
402 out_cond_jump $op->other->pmreplstart;
403 assert "nextop == (OP *)${$op->other->next}L";
404 $source .= " goto op_${$op->other->next};\n";
405 }
406
407 sub out_break_op {
408 my ($idx) = @_;
409
410 out_callop;
411
412 out_cond_jump $_->[$idx]
413 for reverse @loop;
414
415 $source .= " return nextop;\n";
416 }
417
418 sub xop_next {
419 out_break_op 0;
420 }
421
422 sub op_last {
423 out_break_op 1;
424 }
425
426 sub xop_redo {
427 out_break_op 2;
428 }
429
430 sub cv2c {
431 my ($cv) = @_;
432
433 @loop = ();
434
435 my %opsseen;
436 my @todo = $cv->START;
437
438 while (my $op = shift @todo) {
439 for (; $$op; $op = $op->next) {
440 last if $opsseen{$$op}++;
441 push @ops, $op;
442
443 my $name = $op->name;
444 my $class = B::class $op;
445
446 if ($class eq "LOGOP") {
447 unshift @todo, $op->other; # unshift vs. push saves jumps
448 } elsif ($class eq "PMOP") {
449 unshift @todo, $op->pmreplstart if ${$op->pmreplstart};
450 } elsif ($class eq "LOOP") {
451 push @loop, [$op->nextop, $op->lastop->next, $op->redoop->next];
452 }
453 }
454 }
455
456 local $source = <<EOF;
457 OP *%%%FUNC%%% (pTHX)
458 {
459 register OP *nextop = (OP *)${$ops[0]}L;
460 EOF
461
462 while (@ops) {
463 $op = shift @ops;
464 $op_name = $op->name;
465
466 $source .= "op_$$op: /* $op_name */\n";
467 #$source .= "fprintf (stderr, \"$$op in op $op_name\\n\");\n";#d#
468 #$source .= "{ dSP; sv_dump (TOPs); }\n";#d#
469
470 $source .= " PERL_ASYNC_CHECK ();\n"
471 unless exists $flag{noasync}{$op_name};
472
473 if (my $can = __PACKAGE__->can ("op_$op_name")) {
474 # handcrafted replacement
475 $can->($op);
476
477 } elsif (exists $flag{unsafe}{$op_name}) {
478 # unsafe, return to interpreter
479 assert "nextop == (OP *)$$op";
480 $source .= " return nextop;\n";
481
482 } elsif ("LOGOP" eq B::class $op) {
483 # logical operation with optionaö branch
484 out_callop;
485 out_cond_jump $op->other;
486 out_jump_next;
487
488 } elsif ("PMOP" eq B::class $op) {
489 # regex-thingy
490 out_callop;
491 out_cond_jump $op->pmreplroot if ${$op->pmreplroot};
492 out_jump_next;
493
494 } else {
495 # normal operator, linear execution
496 out_linear;
497 }
498 }
499
500 $op_name = "func exit"; assert (0);
501
502 $source .= <<EOF;
503 op_0:
504 return 0;
505 }
506 EOF
507 #warn $source;
508
509 $source
510 }
511
512 sub source2ptr {
513 my ($source) = @_;
514
515 my $md5 = Digest::MD5::md5_hex $source;
516 $source =~ s/%%%FUNC%%%/Faster_$md5/;
517
518 my $stem = "/tmp/$md5";
519
520 unless (-e "$stem$_so") {
521 open FILE, ">:raw", "$stem.c";
522 print FILE <<EOF;
523 #define PERL_NO_GET_CONTEXT
524
525 #include <assert.h>
526
527 #include "EXTERN.h"
528 #include "perl.h"
529 #include "XSUB.h"
530
531 #define RUNOPS_TILL(op) \\
532 while (nextop != (op)) \\
533 { \\
534 PERL_ASYNC_CHECK (); \\
535 PL_op = nextop; nextop = (PL_op->op_ppaddr)(aTHX); \\
536 }
537
538 EOF
539 print FILE $source;
540 close FILE;
541 system "$COMPILE -o $stem$_o $stem.c";
542 system "$LINK -o $stem$_so $stem$_o $LIBS";
543 }
544
545 # warn $source;
546 my $so = DynaLoader::dl_load_file "$stem$_so"
547 or die "$stem$_so: $!";
548
549 DynaLoader::dl_find_symbol $so, "Faster_$md5"
550 or die "Faster_$md5: $!"
551 }
552
553 sub entersub {
554 my ($cv) = @_;
555
556 # always compile the whole stash
557 # my @stash = $cv->STASH->ARRAY;
558 # warn join ":", @stash;
559 # exit;
560
561 eval {
562 my $source = cv2c $cv;
563
564 my $ptr = source2ptr $source;
565
566 patch_cv $cv, $ptr;
567 };
568
569 warn $@ if $@;
570 }
571
572 hook_entersub;
573
574 1;
575
576 =back
577
578 =head1 BUGS/LIMITATIONS
579
580 Perl will check much less often for asynchronous signals in
581 Faster-compiled code. It tries to check on every function call, loop
582 iteration and every I/O operator, though.
583
584 The following things will disable Faster. If you manage to enable them at
585 runtime, bad things will happen.
586
587 enabled tainting
588 enabled debugging
589
590 This will dramatically reduce Faster's performance:
591
592 threads (but you don't care about speed if you use threads anyway)
593
594 These constructs will force the use of the interpreter as soon as they are
595 being executed, for the rest of the currently executed:
596
597 .., ... (flipflop operators)
598 goto
599 next, redo (but not well-behaved last's)
600 eval
601 require
602 any use of formats
603
604 =head1 AUTHOR
605
606 Marc Lehmann <schmorp@schmorp.de>
607 http://home.schmorp.de/
608
609 =cut
610