… | |
… | |
4 | |
4 | |
5 | =head1 SYNOPSIS |
5 | =head1 SYNOPSIS |
6 | |
6 | |
7 | use Faster; |
7 | use Faster; |
8 | |
8 | |
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9 | perl -MFaster ... |
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10 | |
9 | =head1 DESCRIPTION |
11 | =head1 DESCRIPTION |
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12 | |
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13 | This module implements a very simple-minded JIT. It works by more or less |
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14 | translating every function it sees into a C program, compiling it and then |
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15 | replacing the function by the compiled code. |
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16 | |
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17 | As a result, startup times are immense, as every function might lead to a |
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18 | full-blown compilation. |
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19 | |
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20 | The speed improvements are also not great, you can expect 20% or so on |
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21 | average, for code that runs very often. |
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22 | |
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23 | Faster is in the early stages of development. Due to its design its |
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24 | relatively safe to use (it will either work or simply slowdown the program |
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25 | immensely, but rarely cause bugs). |
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26 | |
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27 | Usage is very easy, just C<use Faster> and every function called from then |
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28 | on will be compiled. |
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29 | |
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30 | Right now, Faster will leave ltos of F<*.c>, F<*.o> and F<*.so> files in |
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31 | F</tmp>, and it will even create those temporary files in an insecure |
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32 | manner, so watch out. |
10 | |
33 | |
11 | =over 4 |
34 | =over 4 |
12 | |
35 | |
13 | =cut |
36 | =cut |
14 | |
37 | |
… | |
… | |
31 | my $LINK = "$Config{ld} $Config{ldflags} $Config{lddlflags} $Config{ccdlflags}"; |
54 | my $LINK = "$Config{ld} $Config{ldflags} $Config{lddlflags} $Config{ccdlflags}"; |
32 | my $LIBS = "$Config{libs}"; |
55 | my $LIBS = "$Config{libs}"; |
33 | my $_o = $Config{_o}; |
56 | my $_o = $Config{_o}; |
34 | my $_so = ".so"; |
57 | my $_so = ".so"; |
35 | |
58 | |
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59 | # we don't need no steenking PIC on x86 |
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60 | $COMPILE =~ s/-f(?:PIC|pic)//g |
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61 | if $Config{archname} =~ /^(i[3456]86)-/; |
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62 | |
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63 | my $opt_assert = 1; |
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64 | |
36 | our $source; |
65 | our $source; |
37 | our $label_next; |
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38 | our $label_last; |
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39 | our $label_redo; |
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40 | |
66 | |
41 | my @ops; |
67 | our @ops; |
42 | my $op; |
68 | our $op; |
43 | my $op_name; |
69 | our $op_name; |
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70 | our @op_loop; |
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71 | our %op_regcomp; |
44 | |
72 | |
45 | my %flag; |
73 | my %flag; |
46 | |
74 | |
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75 | # complex flag steting is no longer required, rewrite this ugly code |
47 | for (split /\n/, <<EOF) { |
76 | for (split /\n/, <<EOF) { |
48 | leavesub unsafe |
77 | leavesub unsafe |
49 | leavesublv unsafe |
78 | leavesublv unsafe |
50 | return unsafe |
79 | return unsafe |
51 | flip unsafe |
80 | flip unsafe |
… | |
… | |
54 | redo unsafe |
83 | redo unsafe |
55 | next unsafe |
84 | next unsafe |
56 | eval unsafe |
85 | eval unsafe |
57 | leaveeval unsafe |
86 | leaveeval unsafe |
58 | entertry unsafe |
87 | entertry unsafe |
59 | substconst unsafe |
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60 | formline unsafe |
88 | formline unsafe |
61 | grepstart unsafe |
89 | grepstart unsafe |
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90 | mapstart unsafe |
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91 | substcont unsafe |
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92 | entereval unsafe noasync todo |
62 | require unsafe |
93 | require unsafe |
63 | match unsafe noasync todo |
94 | |
64 | subst unsafe noasync todo |
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65 | entereval unsafe noasync todo |
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66 | mapstart unsafe noasync todo |
95 | mapstart noasync |
67 | |
96 | grepstart noasync |
68 | mapwhile noasync |
97 | match noasync |
69 | grepwhile noasync |
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70 | |
98 | |
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99 | last noasync |
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100 | next noasync |
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101 | redo noasync |
71 | seq noasync |
102 | seq noasync |
72 | pushmark noasync |
103 | pushmark noasync extend=0 |
73 | padsv noasync extend=1 |
104 | padsv noasync extend=1 |
74 | padav noasync extend=1 |
105 | padav noasync extend=1 |
75 | padhv noasync extend=1 |
106 | padhv noasync extend=1 |
76 | padany noasync extend=1 |
107 | padany noasync extend=1 |
77 | entersub noasync |
108 | entersub noasync |
… | |
… | |
105 | leaveloop noasync |
136 | leaveloop noasync |
106 | aelem noasync |
137 | aelem noasync |
107 | aelemfast noasync |
138 | aelemfast noasync |
108 | helem noasync |
139 | helem noasync |
109 | pushre noasync |
140 | pushre noasync |
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141 | subst noasync |
110 | const noasync extend=1 |
142 | const noasync extend=1 |
111 | list noasync |
143 | list noasync |
112 | join noasync |
144 | join noasync |
113 | split noasync |
145 | split noasync |
114 | concat noasync |
146 | concat noasync |
115 | push noasync |
147 | push noasync |
116 | pop noasync |
148 | pop noasync |
117 | shift noasync |
149 | shift noasync |
118 | unshift noasync |
150 | unshift noasync |
119 | require noasync |
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120 | length noasync |
151 | length noasync |
121 | substr noasync |
152 | substr noasync |
122 | stringify noasync |
153 | stringify noasync |
123 | eq noasync |
154 | eq noasync |
124 | ne noasync |
155 | ne noasync |
125 | gt noasync |
156 | gt noasync |
126 | lt noasync |
157 | lt noasync |
127 | ge noasync |
158 | ge noasync |
128 | le noasync |
159 | le noasync |
129 | enteriter noasync |
160 | enteriter noasync |
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161 | ord noasync |
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162 | orassign noasync |
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163 | regcomp noasync |
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164 | regcreset noasync |
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165 | regcmaybe noasync |
130 | |
166 | |
131 | iter async |
167 | iter async |
132 | EOF |
168 | EOF |
133 | my (undef, $op, @flags) = split /\s+/; |
169 | my (undef, $op, @flags) = split /\s+/; |
134 | |
170 | |
135 | undef $flag{$_}{$op} |
171 | undef $flag{$_}{$op} |
136 | for ("known", @flags); |
172 | for ("known", @flags); |
137 | } |
173 | } |
138 | |
174 | |
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175 | my %callop = ( |
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176 | entersub => "(PL_ppaddr [OP_ENTERSUB]) (aTHX)", |
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177 | mapstart => "Perl_pp_grepstart (aTHX)", |
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178 | ); |
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179 | |
139 | sub callop { |
180 | sub callop { |
140 | $op_name eq "entersub" |
181 | $callop{$op_name} || "Perl_pp_$op_name (aTHX)" |
141 | ? "(PL_ppaddr [OP_ENTERSUB]) (aTHX)" |
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142 | : $op_name eq "mapstart" |
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143 | ? "Perl_pp_grepstart (aTHX)" |
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144 | : "Perl_pp_$op_name (aTHX)" |
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145 | } |
182 | } |
146 | |
183 | |
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184 | sub assert { |
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185 | return unless $opt_assert; |
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186 | $source .= " assert ((\"$op_name\", ($_[0])));\n"; |
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187 | } |
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188 | |
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189 | sub out_callop { |
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190 | assert "nextop == (OP *)$$op"; |
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191 | $source .= " PL_op = nextop; nextop = " . (callop $op) . ";\n"; |
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192 | } |
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193 | |
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194 | sub out_cond_jump { |
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195 | $source .= " if (nextop == (OP *)${$_[0]}L) goto op_${$_[0]};\n"; |
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196 | } |
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197 | |
147 | sub out_gotonext { |
198 | sub out_jump_next { |
148 | if (${$op->next}) { |
199 | out_cond_jump $op_regcomp{$$op} |
149 | $source .= " assert ((\"$op_name\", nextop == (OP *)${$op->next}));\n"; |
200 | if $op_regcomp{$$op}; |
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201 | |
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202 | assert "nextop == (OP *)${$op->next}"; |
150 | $source .= " goto op_${$op->next};\n"; |
203 | $source .= " goto op_${$op->next};\n"; |
151 | } else { |
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152 | $source .= " return 0;\n"; |
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153 | } |
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154 | } |
204 | } |
155 | |
205 | |
156 | sub out_next { |
206 | sub out_next { |
157 | $source .= " nextop = (OP *)${$op->next}L;\n"; |
207 | $source .= " nextop = (OP *)${$op->next}L;\n"; |
158 | |
208 | |
159 | out_gotonext; |
209 | out_jump_next; |
160 | } |
210 | } |
161 | |
211 | |
162 | sub out_linear { |
212 | sub out_linear { |
163 | $source .= " assert ((\"$op_name\", nextop == (OP *)$$op));\n";#d# |
213 | out_callop; |
164 | $source .= " PL_op = nextop; nextop = " . (callop $op) . ";\n"; |
214 | out_jump_next; |
165 | if ($op_name eq "entersub") { |
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166 | $source .= <<EOF; |
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167 | while (nextop != (OP *)${$op->next}L) |
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168 | { |
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169 | PERL_ASYNC_CHECK (); |
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170 | PL_op = nextop; nextop = (PL_op->op_ppaddr)(aTHX); |
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171 | } |
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172 | EOF |
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173 | } |
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174 | |
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175 | out_gotonext; |
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176 | } |
215 | } |
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216 | |
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217 | sub op_entersub { |
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218 | out_callop; |
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219 | $source .= " RUNOPS_TILL ((OP *)${$op->next}L);\n"; |
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220 | out_jump_next; |
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221 | } |
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222 | |
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223 | *op_require = \&op_entersub; |
177 | |
224 | |
178 | sub op_nextstate { |
225 | sub op_nextstate { |
179 | $source .= " PL_curcop = (COP *)nextop;\n"; |
226 | $source .= " PL_curcop = (COP *)nextop;\n"; |
180 | $source .= " PL_stack_sp = PL_stack_base + cxstack[cxstack_ix].blk_oldsp;\n"; |
227 | $source .= " PL_stack_sp = PL_stack_base + cxstack[cxstack_ix].blk_oldsp;\n"; |
181 | $source .= " FREETMPS;\n"; |
228 | $source .= " FREETMPS;\n"; |
… | |
… | |
246 | |
293 | |
247 | out_next; |
294 | out_next; |
248 | }; |
295 | }; |
249 | } |
296 | } |
250 | |
297 | |
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298 | # does kill Crossfire/res2pm |
251 | sub op_stringify { |
299 | sub op_stringify { |
252 | $source .= " { dSP; dTARGET; sv_copypv (TARG, TOPs); SETTARG; }\n"; |
300 | my $targ = $op->targ; |
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301 | |
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302 | $source .= <<EOF; |
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303 | { |
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304 | dSP; |
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305 | SV *targ = PAD_SV ((PADOFFSET)$targ); |
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306 | sv_copypv (TARG, TOPs); |
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307 | SETTARG; |
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308 | PUTBACK; |
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309 | } |
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310 | EOF |
253 | |
311 | |
254 | out_next; |
312 | out_next; |
255 | } |
313 | } |
256 | |
314 | |
257 | sub op_and { |
315 | sub op_and { |
… | |
… | |
322 | # pattern const method_named |
380 | # pattern const method_named |
323 | sub op_method_named { |
381 | sub op_method_named { |
324 | $source .= <<EOF; |
382 | $source .= <<EOF; |
325 | { |
383 | { |
326 | static HV *last_stash; |
384 | static HV *last_stash; |
327 | static SV *last_res; |
385 | static SV *last_cv; |
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386 | static U32 last_sub_generation; |
328 | |
387 | |
329 | SV *obj = *(PL_stack_base + TOPMARK + 1); |
388 | SV *obj = *(PL_stack_base + TOPMARK + 1); |
330 | |
389 | |
331 | printf ("todo: PL_subgeneration or somesuch\\n"); |
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332 | if (SvROK (obj) && SvOBJECT (SvRV (obj))) |
390 | if (!SvGMAGICAL (obj) && SvROK (obj) && SvOBJECT (SvRV (obj))) |
333 | { |
391 | { |
334 | dSP; |
392 | dSP; |
335 | HV *stash = SvSTASH (SvRV (obj)); |
393 | HV *stash = SvSTASH (SvRV (obj)); |
336 | |
394 | |
337 | /* simple "polymorphic" inline cache */ |
395 | /* simple "polymorphic" inline cache */ |
338 | if (stash == last_stash) |
396 | if (stash == last_stash |
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397 | && PL_sub_generation == last_sub_generation) |
339 | { |
398 | { |
340 | XPUSHs (last_res); |
399 | XPUSHs (last_cv); |
341 | PUTBACK; |
400 | PUTBACK; |
342 | } |
401 | } |
343 | else |
402 | else |
344 | { |
403 | { |
345 | PL_op = nextop; |
|
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346 | nextop = Perl_pp_method_named (aTHX); |
404 | PL_op = nextop; nextop = Perl_pp_method_named (aTHX); |
347 | |
405 | |
348 | SPAGAIN; |
406 | SPAGAIN; |
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407 | last_sub_generation = PL_sub_generation; |
349 | last_stash = stash; |
408 | last_stash = stash; |
350 | last_res = TOPs; |
409 | last_cv = TOPs; |
351 | } |
410 | } |
352 | } |
411 | } |
353 | else |
412 | else |
354 | { |
413 | { |
355 | /* error case usually */ |
414 | /* error case usually */ |
356 | PL_op = nextop; |
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357 | nextop = Perl_pp_method_named (aTHX); |
415 | PL_op = nextop; nextop = Perl_pp_method_named (aTHX); |
358 | } |
416 | } |
359 | } |
417 | } |
360 | EOF |
418 | EOF |
361 | |
419 | |
362 | out_next; |
420 | out_next; |
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421 | } |
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422 | |
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423 | sub op_grepstart { |
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424 | out_callop; |
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425 | $op = $op->next; |
|
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426 | out_cond_jump $op->other; |
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427 | out_jump_next; |
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428 | } |
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429 | |
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430 | *op_mapstart = \&op_grepstart; |
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431 | |
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432 | sub op_substcont { |
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433 | out_callop; |
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434 | out_cond_jump $op->other->pmreplstart; |
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435 | assert "nextop == (OP *)${$op->other->next}L"; |
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436 | $source .= " goto op_${$op->other->next};\n"; |
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437 | } |
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438 | |
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439 | sub out_break_op { |
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440 | my ($idx) = @_; |
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441 | |
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442 | out_callop; |
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443 | |
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444 | out_cond_jump $_->[$idx] |
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445 | for reverse @op_loop; |
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446 | |
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447 | $source .= " return nextop;\n"; |
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448 | } |
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449 | |
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450 | sub xop_next { |
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451 | out_break_op 0; |
|
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452 | } |
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453 | |
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454 | sub op_last { |
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455 | out_break_op 1; |
|
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456 | } |
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457 | |
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458 | sub xop_redo { |
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459 | out_break_op 2; |
363 | } |
460 | } |
364 | |
461 | |
365 | sub cv2c { |
462 | sub cv2c { |
366 | my ($cv) = @_; |
463 | my ($cv) = @_; |
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464 | |
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465 | local @ops; |
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466 | local @op_loop; |
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467 | local %op_regcomp; |
367 | |
468 | |
368 | my %opsseen; |
469 | my %opsseen; |
369 | my @todo = $cv->START; |
470 | my @todo = $cv->START; |
370 | |
471 | |
371 | while (my $op = shift @todo) { |
472 | while (my $op = shift @todo) { |
372 | for (; $$op; $op = $op->next) { |
473 | for (; $$op; $op = $op->next) { |
373 | last if $opsseen{$$op}++; |
474 | last if $opsseen{$$op}++; |
374 | push @ops, $op; |
475 | push @ops, $op; |
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476 | |
375 | my $name = $op->name; |
477 | my $name = $op->name; |
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478 | my $class = B::class $op; |
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479 | |
376 | if (B::class($op) eq "LOGOP") { |
480 | if ($class eq "LOGOP") { |
377 | push @todo, $op->other; |
481 | unshift @todo, $op->other; # unshift vs. push saves jumps |
378 | } elsif ($name eq "subst" and ${ $op->pmreplstart }) { |
482 | |
379 | push @todo, $op->pmreplstart; |
483 | # regcomp/o patches ops at runtime, lets expect that |
380 | } elsif ($name =~ /^enter(loop|iter)$/) { |
484 | $op_regcomp{${$op->first}} = $op->next |
381 | # if ($] > 5.009) { |
485 | if $name eq "regcomp" && $op->other->pmflags & B::PMf_KEEP; |
382 | # $labels{${$op->nextop}} = "NEXT"; |
486 | |
383 | # $labels{${$op->lastop}} = "LAST"; |
487 | } elsif ($class eq "PMOP") { |
384 | # $labels{${$op->redoop}} = "REDO"; |
488 | unshift @todo, $op->pmreplstart if ${$op->pmreplstart}; |
385 | # } else { |
489 | |
386 | # $labels{$op->nextop->seq} = "NEXT"; |
490 | } elsif ($class eq "LOOP") { |
387 | # $labels{$op->lastop->seq} = "LAST"; |
491 | push @op_loop, [$op->nextop, $op->lastop->next, $op->redoop->next]; |
388 | # $labels{$op->redoop->seq} = "REDO"; |
492 | push @todo, $op->nextop, $op->lastop->next, $op->redoop->next; |
389 | # } |
|
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390 | } |
493 | } |
391 | } |
494 | } |
392 | } |
495 | } |
393 | |
496 | |
394 | local $source = <<EOF; |
497 | local $source = <<EOF; |
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498 | OP *%%%FUNC%%% (pTHX) |
|
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499 | { |
|
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500 | register OP *nextop = (OP *)${$ops[0]}L; |
|
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501 | EOF |
|
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502 | |
|
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503 | while (@ops) { |
|
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504 | $op = shift @ops; |
|
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505 | $op_name = $op->name; |
|
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506 | |
|
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507 | $source .= "op_$$op: /* $op_name */\n"; |
|
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508 | #$source .= "fprintf (stderr, \"$$op in op $op_name\\n\");\n";#d# |
|
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509 | #$source .= "{ dSP; sv_dump (TOPs); }\n";#d# |
|
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510 | |
|
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511 | $source .= " PERL_ASYNC_CHECK ();\n" |
|
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512 | unless exists $flag{noasync}{$op_name}; |
|
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513 | |
|
|
514 | if (my $can = __PACKAGE__->can ("op_$op_name")) { |
|
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515 | # handcrafted replacement |
|
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516 | $can->($op); |
|
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517 | |
|
|
518 | } elsif (exists $flag{unsafe}{$op_name}) { |
|
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519 | # unsafe, return to interpreter |
|
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520 | assert "nextop == (OP *)$$op"; |
|
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521 | $source .= " return nextop;\n"; |
|
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522 | |
|
|
523 | } elsif ("LOGOP" eq B::class $op) { |
|
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524 | # logical operation with optionaö branch |
|
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525 | out_callop; |
|
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526 | out_cond_jump $op->other; |
|
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527 | out_jump_next; |
|
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528 | |
|
|
529 | } elsif ("PMOP" eq B::class $op) { |
|
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530 | # regex-thingy |
|
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531 | out_callop; |
|
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532 | out_cond_jump $op->pmreplroot if ${$op->pmreplroot}; |
|
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533 | out_jump_next; |
|
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534 | |
|
|
535 | } else { |
|
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536 | # normal operator, linear execution |
|
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537 | out_linear; |
|
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538 | } |
|
|
539 | } |
|
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540 | |
|
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541 | $op_name = "func exit"; assert (0); |
|
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542 | |
|
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543 | $source .= <<EOF; |
|
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544 | op_0: |
|
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545 | return 0; |
|
|
546 | } |
|
|
547 | EOF |
|
|
548 | #warn $source; |
|
|
549 | |
|
|
550 | $source |
|
|
551 | } |
|
|
552 | |
|
|
553 | sub source2ptr { |
|
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554 | my ($source) = @_; |
|
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555 | |
|
|
556 | my $md5 = Digest::MD5::md5_hex $source; |
|
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557 | $source =~ s/%%%FUNC%%%/Faster_$md5/; |
|
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558 | |
|
|
559 | my $stem = "/tmp/$md5"; |
|
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560 | |
|
|
561 | unless (-e "$stem$_so") { |
|
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562 | open FILE, ">:raw", "$stem.c"; |
|
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563 | print FILE <<EOF; |
395 | #define PERL_NO_GET_CONTEXT |
564 | #define PERL_NO_GET_CONTEXT |
396 | |
565 | |
397 | //#define NDEBUG 1 |
|
|
398 | #include <assert.h> |
566 | #include <assert.h> |
399 | |
567 | |
400 | #include "EXTERN.h" |
568 | #include "EXTERN.h" |
401 | #include "perl.h" |
569 | #include "perl.h" |
402 | #include "XSUB.h" |
570 | #include "XSUB.h" |
403 | |
571 | |
404 | OP *%%%FUNC%%% (pTHX) |
572 | #define RUNOPS_TILL(op) \\ |
405 | { |
573 | while (nextop != (op)) \\ |
406 | register OP *nextop = (OP *)${$ops[0]}L; |
574 | { \\ |
407 | EOF |
575 | PERL_ASYNC_CHECK (); \\ |
408 | |
576 | PL_op = nextop; nextop = (PL_op->op_ppaddr)(aTHX); \\ |
409 | while (@ops) { |
|
|
410 | $op = shift @ops; |
|
|
411 | $op_name = $op->name; |
|
|
412 | |
|
|
413 | $source .= "op_$$op: /* $op_name */\n"; |
|
|
414 | #$source .= "fprintf (stderr, \"$$op in op $op_name\\n\");\n";#d# |
|
|
415 | #$source .= "{ dSP; sv_dump (TOPs); }\n";#d# |
|
|
416 | |
|
|
417 | unless (exists $flag{noasync}{$op_name}) { |
|
|
418 | $source .= " PERL_ASYNC_CHECK ();\n"; |
|
|
419 | } |
|
|
420 | |
|
|
421 | if (my $can = __PACKAGE__->can ("op_$op_name")) { |
|
|
422 | $can->($op); |
|
|
423 | } elsif (exists $flag{unsafe}{$op_name}) { |
|
|
424 | $source .= " assert ((\"$op_name\", nextop == (OP *)$$op));\n"; |
|
|
425 | $source .= " return nextop;\n"; |
|
|
426 | } elsif ("LOGOP" eq B::class $op or exists $flag{otherop}{$op_name}) { |
|
|
427 | $source .= " assert ((\"$op_name\", nextop == (OP *)$$op));\n"; |
|
|
428 | $source .= " PL_op = nextop; nextop = " . (callop $op) . ";\n"; |
|
|
429 | $source .= " if (nextop == (OP *)${$op->other}L) goto op_${$op->other};\n"; |
|
|
430 | $source .= " assert ((\"$op_name\", nextop == (OP *)${$op->next}));\n"; |
|
|
431 | $source .= ${$op->next} ? " goto op_${$op->next};\n" : " return 0;\n"; |
|
|
432 | } else { |
|
|
433 | out_linear; |
|
|
434 | } |
|
|
435 | } |
577 | } |
436 | |
578 | |
437 | $source .= "}\n"; |
579 | EOF |
438 | #warn $source; |
|
|
439 | |
|
|
440 | $source |
|
|
441 | } |
|
|
442 | |
|
|
443 | sub source2ptr { |
|
|
444 | my ($source) = @_; |
|
|
445 | |
|
|
446 | my $md5 = Digest::MD5::md5_hex $source; |
|
|
447 | $source =~ s/%%%FUNC%%%/Faster_$md5/; |
|
|
448 | |
|
|
449 | my $stem = "/tmp/$md5"; |
|
|
450 | |
|
|
451 | unless (-e "$stem$_so") { |
|
|
452 | open FILE, ">:raw", "$stem.c"; |
|
|
453 | print FILE $source; |
580 | print FILE $source; |
454 | close FILE; |
581 | close FILE; |
455 | system "$COMPILE -o $stem$_o $stem.c"; |
582 | system "$COMPILE -o $stem$_o $stem.c"; |
456 | system "$LINK -o $stem$_so $stem$_o $LIBS"; |
583 | system "$LINK -o $stem$_so $stem$_o $LIBS"; |
457 | } |
584 | } |
… | |
… | |
465 | } |
592 | } |
466 | |
593 | |
467 | sub entersub { |
594 | sub entersub { |
468 | my ($cv) = @_; |
595 | my ($cv) = @_; |
469 | |
596 | |
|
|
597 | # always compile the whole stash |
|
|
598 | # my @stash = $cv->STASH->ARRAY; |
|
|
599 | # warn join ":", @stash; |
|
|
600 | # exit; |
|
|
601 | |
470 | eval { |
602 | eval { |
471 | my $source = cv2c $cv; |
603 | my $source = cv2c $cv; |
472 | |
604 | |
473 | my $ptr = source2ptr $source; |
605 | my $ptr = source2ptr $source; |
474 | |
606 | |
475 | patch_cv $cv, $ptr; |
607 | patch_cv $cv, $ptr; |
476 | }; |
608 | }; |
477 | |
609 | |
478 | warn $@ if $@; |
610 | warn $@ if $@; |
479 | } |
611 | } |
480 | |
612 | |
… | |
… | |
482 | |
614 | |
483 | 1; |
615 | 1; |
484 | |
616 | |
485 | =back |
617 | =back |
486 | |
618 | |
487 | =head1 LIMITATIONS |
619 | =head1 BUGS/LIMITATIONS |
488 | |
620 | |
489 | Tainting and debugging will disable Faster. |
621 | Perl will check much less often for asynchronous signals in |
|
|
622 | Faster-compiled code. It tries to check on every function call, loop |
|
|
623 | iteration and every I/O operator, though. |
|
|
624 | |
|
|
625 | The following things will disable Faster. If you manage to enable them at |
|
|
626 | runtime, bad things will happen. |
|
|
627 | |
|
|
628 | enabled tainting |
|
|
629 | enabled debugging |
|
|
630 | |
|
|
631 | This will dramatically reduce Faster's performance: |
|
|
632 | |
|
|
633 | threads (but you don't care about speed if you use threads anyway) |
|
|
634 | |
|
|
635 | These constructs will force the use of the interpreter as soon as they are |
|
|
636 | being executed, for the rest of the currently executed: |
|
|
637 | |
|
|
638 | .., ... (flipflop operators) |
|
|
639 | goto |
|
|
640 | next, redo (but not well-behaved last's) |
|
|
641 | eval |
|
|
642 | require |
|
|
643 | any use of formats |
490 | |
644 | |
491 | =head1 AUTHOR |
645 | =head1 AUTHOR |
492 | |
646 | |
493 | Marc Lehmann <schmorp@schmorp.de> |
647 | Marc Lehmann <schmorp@schmorp.de> |
494 | http://home.schmorp.de/ |
648 | http://home.schmorp.de/ |