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1 | package B::Concise; |
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2 | # Copyright (C) 2000-2003 Stephen McCamant. All rights reserved. |
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3 | # This program is free software; you can redistribute and/or modify it |
4 | # under the same terms as Perl itself. |
5 | |
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6 | use strict; |
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7 | use warnings; |
8 | |
9 | use Exporter (); |
10 | |
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11 | our $VERSION = "0.55"; |
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12 | our @ISA = qw(Exporter); |
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13 | our @EXPORT_OK = qw(set_style set_style_standard add_callback |
14 | concise_cv concise_main); |
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15 | |
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16 | use B qw(class ppname main_start main_root main_cv cstring svref_2object |
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17 | SVf_IOK SVf_NOK SVf_POK SVf_IVisUV OPf_KIDS); |
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18 | |
19 | my %style = |
20 | ("terse" => |
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21 | ["(?(#label =>\n)?)(*( )*)#class (#addr) #name (?([#targ])?) " |
22 | . "#svclass~(?((#svaddr))?)~#svval~(?(label \"#coplabel\")?)\n", |
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23 | "(*( )*)goto #class (#addr)\n", |
24 | "#class pp_#name"], |
25 | "concise" => |
26 | ["#hyphseq2 (*( (x( ;)x))*)<#classsym> " |
27 | . "#exname#arg(?([#targarglife])?)~#flags(?(/#private)?)(x(;~->#next)x)\n", |
28 | " (*( )*) goto #seq\n", |
29 | "(?(<#seq>)?)#exname#arg(?([#targarglife])?)"], |
30 | "linenoise" => |
31 | ["(x(;(*( )*))x)#noise#arg(?([#targarg])?)(x( ;\n)x)", |
32 | "gt_#seq ", |
33 | "(?(#seq)?)#noise#arg(?([#targarg])?)"], |
34 | "debug" => |
35 | ["#class (#addr)\n\top_next\t\t#nextaddr\n\top_sibling\t#sibaddr\n\t" |
36 | . "op_ppaddr\tPL_ppaddr[OP_#NAME]\n\top_type\t\t#typenum\n\top_seq\t\t" |
37 | . "#seqnum\n\top_flags\t#flagval\n\top_private\t#privval\n" |
38 | . "(?(\top_first\t#firstaddr\n)?)(?(\top_last\t\t#lastaddr\n)?)" |
39 | . "(?(\top_sv\t\t#svaddr\n)?)", |
40 | " GOTO #addr\n", |
41 | "#addr"], |
42 | "env" => [$ENV{B_CONCISE_FORMAT}, $ENV{B_CONCISE_GOTO_FORMAT}, |
43 | $ENV{B_CONCISE_TREE_FORMAT}], |
44 | ); |
45 | |
46 | my($format, $gotofmt, $treefmt); |
47 | my $curcv; |
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48 | my $cop_seq_base; |
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49 | my @callbacks; |
50 | |
51 | sub set_style { |
52 | ($format, $gotofmt, $treefmt) = @_; |
53 | } |
54 | |
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55 | sub set_style_standard { |
56 | my($name) = @_; |
57 | set_style(@{$style{$name}}); |
58 | } |
59 | |
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60 | sub add_callback { |
61 | push @callbacks, @_; |
62 | } |
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63 | |
64 | sub concise_cv { |
65 | my ($order, $cvref) = @_; |
66 | my $cv = svref_2object($cvref); |
67 | $curcv = $cv; |
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68 | sequence($cv->START); |
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69 | if ($order eq "exec") { |
70 | walk_exec($cv->START); |
71 | } elsif ($order eq "basic") { |
72 | walk_topdown($cv->ROOT, sub { $_[0]->concise($_[1]) }, 0); |
73 | } else { |
74 | print tree($cv->ROOT, 0) |
75 | } |
76 | } |
77 | |
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78 | sub concise_main { |
79 | my($order) = @_; |
80 | sequence(main_start); |
81 | $curcv = main_cv; |
82 | if ($order eq "exec") { |
83 | return if class(main_start) eq "NULL"; |
84 | walk_exec(main_start); |
85 | } elsif ($order eq "tree") { |
86 | return if class(main_root) eq "NULL"; |
87 | print tree(main_root, 0); |
88 | } elsif ($order eq "basic") { |
89 | return if class(main_root) eq "NULL"; |
90 | walk_topdown(main_root, |
91 | sub { $_[0]->concise($_[1]) }, 0); |
92 | } |
93 | } |
94 | |
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95 | my $start_sym = "\e(0"; # "\cN" sometimes also works |
96 | my $end_sym = "\e(B"; # "\cO" respectively |
97 | |
98 | my @tree_decorations = |
99 | ([" ", "--", "+-", "|-", "| ", "`-", "-", 1], |
100 | [" ", "-", "+", "+", "|", "`", "", 0], |
101 | [" ", map("$start_sym$_$end_sym", "qq", "wq", "tq", "x ", "mq", "q"), 1], |
102 | [" ", map("$start_sym$_$end_sym", "q", "w", "t", "x", "m"), "", 0], |
103 | ); |
104 | my $tree_style = 0; |
105 | |
106 | my $base = 36; |
107 | my $big_endian = 1; |
108 | |
109 | my $order = "basic"; |
110 | |
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111 | set_style_standard("concise"); |
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112 | |
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113 | sub compile { |
114 | my @options = grep(/^-/, @_); |
115 | my @args = grep(!/^-/, @_); |
116 | my $do_main = 0; |
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117 | for my $o (@options) { |
118 | if ($o eq "-basic") { |
119 | $order = "basic"; |
120 | } elsif ($o eq "-exec") { |
121 | $order = "exec"; |
122 | } elsif ($o eq "-tree") { |
123 | $order = "tree"; |
124 | } elsif ($o eq "-compact") { |
125 | $tree_style |= 1; |
126 | } elsif ($o eq "-loose") { |
127 | $tree_style &= ~1; |
128 | } elsif ($o eq "-vt") { |
129 | $tree_style |= 2; |
130 | } elsif ($o eq "-ascii") { |
131 | $tree_style &= ~2; |
132 | } elsif ($o eq "-main") { |
133 | $do_main = 1; |
134 | } elsif ($o =~ /^-base(\d+)$/) { |
135 | $base = $1; |
136 | } elsif ($o eq "-bigendian") { |
137 | $big_endian = 1; |
138 | } elsif ($o eq "-littleendian") { |
139 | $big_endian = 0; |
140 | } elsif (exists $style{substr($o, 1)}) { |
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141 | set_style(@{$style{substr($o, 1)}}); |
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142 | } else { |
143 | warn "Option $o unrecognized"; |
144 | } |
145 | } |
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146 | return sub { |
147 | if (@args) { |
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148 | for my $objname (@args) { |
149 | $objname = "main::" . $objname unless $objname =~ /::/; |
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150 | print "$objname:\n"; |
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151 | eval "concise_cv(\$order, \\&$objname)"; |
152 | die "concise_cv($order, \\&$objname) failed: $@" if $@; |
153 | } |
154 | } |
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155 | if (!@args or $do_main) { |
156 | print "main program:\n" if $do_main; |
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157 | concise_main($order); |
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158 | } |
159 | } |
160 | } |
161 | |
162 | my %labels; |
163 | my $lastnext; |
164 | |
165 | my %opclass = ('OP' => "0", 'UNOP' => "1", 'BINOP' => "2", 'LOGOP' => "|", |
166 | 'LISTOP' => "@", 'PMOP' => "/", 'SVOP' => "\$", 'GVOP' => "*", |
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167 | 'PVOP' => '"', 'LOOP' => "{", 'COP' => ";", 'PADOP' => "#"); |
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168 | |
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169 | no warnings 'qw'; # "Possible attempt to put comments..." |
170 | my @linenoise = |
171 | qw'# () sc ( @? 1 $* gv *{ m$ m@ m% m? p/ *$ $ $# & a& pt \\ s\\ rf bl |
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172 | ` *? <> ?? ?/ r/ c/ // qr s/ /c y/ = @= C sC Cp sp df un BM po +1 +I |
173 | -1 -I 1+ I+ 1- I- ** * i* / i/ %$ i% x + i+ - i- . " << >> < i< |
174 | > i> <= i, >= i. == i= != i! <? i? s< s> s, s. s= s! s? b& b^ b| -0 -i |
175 | ! ~ a2 si cs rd sr e^ lg sq in %x %o ab le ss ve ix ri sf FL od ch cy |
176 | uf lf uc lc qm @ [f [ @[ eh vl ky dl ex % ${ @{ uk pk st jn ) )[ a@ |
177 | a% sl +] -] [- [+ so rv GS GW MS MW .. f. .f && || ^^ ?: &= |= -> s{ s} |
178 | v} ca wa di rs ;; ; ;d }{ { } {} f{ it {l l} rt }l }n }r dm }g }e ^o |
179 | ^c ^| ^# um bm t~ u~ ~d DB db ^s se ^g ^r {w }w pf pr ^O ^K ^R ^W ^d ^v |
180 | ^e ^t ^k t. fc ic fl .s .p .b .c .l .a .h g1 s1 g2 s2 ?. l? -R -W -X -r |
181 | -w -x -e -o -O -z -s -M -A -C -S -c -b -f -d -p -l -u -g -k -t -T -B cd |
182 | co cr u. cm ut r. l@ s@ r@ mD uD oD rD tD sD wD cD f$ w$ p$ sh e$ k$ g3 |
183 | g4 s4 g5 s5 T@ C@ L@ G@ A@ S@ Hg Hc Hr Hw Mg Mc Ms Mr Sg Sc So rq do {e |
184 | e} {t t} g6 G6 6e g7 G7 7e g8 G8 8e g9 G9 9e 6s 7s 8s 9s 6E 7E 8E 9E Pn |
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185 | Pu GP SP EP Gn Gg GG SG EG g0 c$ lk t$ ;s n> // /= CO'; |
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186 | |
187 | my $chars = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"; |
188 | |
189 | sub op_flags { |
190 | my($x) = @_; |
191 | my(@v); |
192 | push @v, "v" if ($x & 3) == 1; |
193 | push @v, "s" if ($x & 3) == 2; |
194 | push @v, "l" if ($x & 3) == 3; |
195 | push @v, "K" if $x & 4; |
196 | push @v, "P" if $x & 8; |
197 | push @v, "R" if $x & 16; |
198 | push @v, "M" if $x & 32; |
199 | push @v, "S" if $x & 64; |
200 | push @v, "*" if $x & 128; |
201 | return join("", @v); |
202 | } |
203 | |
204 | sub base_n { |
205 | my $x = shift; |
206 | return "-" . base_n(-$x) if $x < 0; |
207 | my $str = ""; |
208 | do { $str .= substr($chars, $x % $base, 1) } while $x = int($x / $base); |
209 | $str = reverse $str if $big_endian; |
210 | return $str; |
211 | } |
212 | |
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213 | my %sequence_num; |
214 | my $seq_max = 1; |
215 | |
216 | sub seq { |
217 | my($op) = @_; |
218 | return "-" if not exists $sequence_num{$$op}; |
219 | return base_n($sequence_num{$$op}); |
220 | } |
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221 | |
222 | sub walk_topdown { |
223 | my($op, $sub, $level) = @_; |
224 | $sub->($op, $level); |
225 | if ($op->flags & OPf_KIDS) { |
226 | for (my $kid = $op->first; $$kid; $kid = $kid->sibling) { |
227 | walk_topdown($kid, $sub, $level + 1); |
228 | } |
229 | } |
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230 | if (class($op) eq "PMOP" and $op->pmreplroot and $ {$op->pmreplroot} |
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231 | and $op->pmreplroot->isa("B::OP")) { |
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232 | walk_topdown($op->pmreplroot, $sub, $level + 1); |
233 | } |
234 | } |
235 | |
236 | sub walklines { |
237 | my($ar, $level) = @_; |
238 | for my $l (@$ar) { |
239 | if (ref($l) eq "ARRAY") { |
240 | walklines($l, $level + 1); |
241 | } else { |
242 | $l->concise($level); |
243 | } |
244 | } |
245 | } |
246 | |
247 | sub walk_exec { |
248 | my($top, $level) = @_; |
249 | my %opsseen; |
250 | my @lines; |
251 | my @todo = ([$top, \@lines]); |
252 | while (@todo and my($op, $targ) = @{shift @todo}) { |
253 | for (; $$op; $op = $op->next) { |
254 | last if $opsseen{$$op}++; |
255 | push @$targ, $op; |
256 | my $name = $op->name; |
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257 | if (class($op) eq "LOGOP") { |
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258 | my $ar = []; |
259 | push @$targ, $ar; |
260 | push @todo, [$op->other, $ar]; |
261 | } elsif ($name eq "subst" and $ {$op->pmreplstart}) { |
262 | my $ar = []; |
263 | push @$targ, $ar; |
264 | push @todo, [$op->pmreplstart, $ar]; |
265 | } elsif ($name =~ /^enter(loop|iter)$/) { |
266 | $labels{$op->nextop->seq} = "NEXT"; |
267 | $labels{$op->lastop->seq} = "LAST"; |
268 | $labels{$op->redoop->seq} = "REDO"; |
269 | } |
270 | } |
271 | } |
272 | walklines(\@lines, 0); |
273 | } |
274 | |
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275 | # The structure of this routine is purposely modeled after op.c's peep() |
276 | sub sequence { |
277 | my($op) = @_; |
278 | my $oldop = 0; |
279 | return if class($op) eq "NULL" or exists $sequence_num{$$op}; |
280 | for (; $$op; $op = $op->next) { |
281 | last if exists $sequence_num{$$op}; |
282 | my $name = $op->name; |
283 | if ($name =~ /^(null|scalar|lineseq|scope)$/) { |
284 | next if $oldop and $ {$op->next}; |
285 | } else { |
286 | $sequence_num{$$op} = $seq_max++; |
287 | if (class($op) eq "LOGOP") { |
288 | my $other = $op->other; |
289 | $other = $other->next while $other->name eq "null"; |
290 | sequence($other); |
291 | } elsif (class($op) eq "LOOP") { |
292 | my $redoop = $op->redoop; |
293 | $redoop = $redoop->next while $redoop->name eq "null"; |
294 | sequence($redoop); |
295 | my $nextop = $op->nextop; |
296 | $nextop = $nextop->next while $nextop->name eq "null"; |
297 | sequence($nextop); |
298 | my $lastop = $op->lastop; |
299 | $lastop = $lastop->next while $lastop->name eq "null"; |
300 | sequence($lastop); |
301 | } elsif ($name eq "subst" and $ {$op->pmreplstart}) { |
302 | my $replstart = $op->pmreplstart; |
303 | $replstart = $replstart->next while $replstart->name eq "null"; |
304 | sequence($replstart); |
305 | } |
306 | } |
307 | $oldop = $op; |
308 | } |
309 | } |
310 | |
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311 | sub fmt_line { |
312 | my($hr, $fmt, $level) = @_; |
313 | my $text = $fmt; |
314 | $text =~ s/\(\?\(([^\#]*?)\#(\w+)([^\#]*?)\)\?\)/ |
315 | $hr->{$2} ? $1.$hr->{$2}.$3 : ""/eg; |
316 | $text =~ s/\(x\((.*?);(.*?)\)x\)/$order eq "exec" ? $1 : $2/egs; |
317 | $text =~ s/\(\*\(([^;]*?)\)\*\)/$1 x $level/egs; |
318 | $text =~ s/\(\*\((.*?);(.*?)\)\*\)/$1 x ($level - 1) . $2 x ($level>0)/egs; |
319 | $text =~ s/#([a-zA-Z]+)(\d+)/sprintf("%-$2s", $hr->{$1})/eg; |
320 | $text =~ s/#([a-zA-Z]+)/$hr->{$1}/eg; |
321 | $text =~ s/[ \t]*~+[ \t]*/ /g; |
322 | return $text; |
323 | } |
324 | |
325 | my %priv; |
326 | $priv{$_}{128} = "LVINTRO" |
327 | for ("pos", "substr", "vec", "threadsv", "gvsv", "rv2sv", "rv2hv", "rv2gv", |
328 | "rv2av", "rv2arylen", "aelem", "helem", "aslice", "hslice", "padsv", |
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329 | "padav", "padhv", "enteriter"); |
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330 | $priv{$_}{64} = "REFC" for ("leave", "leavesub", "leavesublv", "leavewrite"); |
331 | $priv{"aassign"}{64} = "COMMON"; |
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332 | $priv{"sassign"}{64} = "BKWARD"; |
333 | $priv{$_}{64} = "RTIME" for ("match", "subst", "substcont"); |
334 | @{$priv{"trans"}}{1,2,4,8,16,64} = ("<UTF", ">UTF", "IDENT", "SQUASH", "DEL", |
335 | "COMPL", "GROWS"); |
336 | $priv{"repeat"}{64} = "DOLIST"; |
337 | $priv{"leaveloop"}{64} = "CONT"; |
338 | @{$priv{$_}}{32,64,96} = ("DREFAV", "DREFHV", "DREFSV") |
339 | for ("entersub", map("rv2${_}v", "a", "s", "h", "g"), "aelem", "helem"); |
340 | $priv{"entersub"}{16} = "DBG"; |
341 | $priv{"entersub"}{32} = "TARG"; |
342 | @{$priv{$_}}{4,8,128} = ("INARGS","AMPER","NO()") for ("entersub", "rv2cv"); |
343 | $priv{"gv"}{32} = "EARLYCV"; |
344 | $priv{"aelem"}{16} = $priv{"helem"}{16} = "LVDEFER"; |
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345 | $priv{$_}{16} = "OURINTR" for ("gvsv", "rv2sv", "rv2av", "rv2hv", "r2gv", |
346 | "enteriter"); |
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347 | $priv{$_}{16} = "TARGMY" |
348 | for (map(($_,"s$_"),"chop", "chomp"), |
349 | map(($_,"i_$_"), "postinc", "postdec", "multiply", "divide", "modulo", |
350 | "add", "subtract", "negate"), "pow", "concat", "stringify", |
351 | "left_shift", "right_shift", "bit_and", "bit_xor", "bit_or", |
352 | "complement", "atan2", "sin", "cos", "rand", "exp", "log", "sqrt", |
353 | "int", "hex", "oct", "abs", "length", "index", "rindex", "sprintf", |
354 | "ord", "chr", "crypt", "quotemeta", "join", "push", "unshift", "flock", |
355 | "chdir", "chown", "chroot", "unlink", "chmod", "utime", "rename", |
356 | "link", "symlink", "mkdir", "rmdir", "wait", "waitpid", "system", |
357 | "exec", "kill", "getppid", "getpgrp", "setpgrp", "getpriority", |
358 | "setpriority", "time", "sleep"); |
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359 | @{$priv{"const"}}{8,16,32,64,128} = ("STRICT","ENTERED", '$[', "BARE", "WARN"); |
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360 | $priv{"flip"}{64} = $priv{"flop"}{64} = "LINENUM"; |
361 | $priv{"list"}{64} = "GUESSED"; |
362 | $priv{"delete"}{64} = "SLICE"; |
363 | $priv{"exists"}{64} = "SUB"; |
364 | $priv{$_}{64} = "LOCALE" |
365 | for ("sort", "prtf", "sprintf", "slt", "sle", "seq", "sne", "sgt", "sge", |
366 | "scmp", "lc", "uc", "lcfirst", "ucfirst"); |
367 | @{$priv{"sort"}}{1,2,4} = ("NUM", "INT", "REV"); |
368 | $priv{"threadsv"}{64} = "SVREFd"; |
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369 | @{$priv{$_}}{16,32,64,128} = ("INBIN","INCR","OUTBIN","OUTCR") |
370 | for ("open", "backtick"); |
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371 | $priv{"exit"}{128} = "VMS"; |
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372 | $priv{$_}{2} = "FTACCESS" |
373 | for ("ftrread", "ftrwrite", "ftrexec", "fteread", "ftewrite", "fteexec"); |
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374 | |
375 | sub private_flags { |
376 | my($name, $x) = @_; |
377 | my @s; |
378 | for my $flag (128, 96, 64, 32, 16, 8, 4, 2, 1) { |
379 | if ($priv{$name}{$flag} and $x & $flag and $x >= $flag) { |
380 | $x -= $flag; |
381 | push @s, $priv{$name}{$flag}; |
382 | } |
383 | } |
384 | push @s, $x if $x; |
385 | return join(",", @s); |
386 | } |
387 | |
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388 | sub concise_sv { |
389 | my($sv, $hr) = @_; |
390 | $hr->{svclass} = class($sv); |
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391 | $hr->{svclass} = "UV" |
392 | if $hr->{svclass} eq "IV" and $sv->FLAGS & SVf_IVisUV; |
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393 | $hr->{svaddr} = sprintf("%#x", $$sv); |
394 | if ($hr->{svclass} eq "GV") { |
395 | my $gv = $sv; |
396 | my $stash = $gv->STASH->NAME; |
397 | if ($stash eq "main") { |
398 | $stash = ""; |
399 | } else { |
400 | $stash = $stash . "::"; |
401 | } |
402 | $hr->{svval} = "*$stash" . $gv->SAFENAME; |
403 | return "*$stash" . $gv->SAFENAME; |
404 | } else { |
405 | while (class($sv) eq "RV") { |
406 | $hr->{svval} .= "\\"; |
407 | $sv = $sv->RV; |
408 | } |
409 | if (class($sv) eq "SPECIAL") { |
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410 | $hr->{svval} .= ["Null", "sv_undef", "sv_yes", "sv_no"]->[$$sv]; |
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411 | } elsif ($sv->FLAGS & SVf_NOK) { |
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412 | $hr->{svval} .= $sv->NV; |
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413 | } elsif ($sv->FLAGS & SVf_IOK) { |
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414 | $hr->{svval} .= $sv->int_value; |
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415 | } elsif ($sv->FLAGS & SVf_POK) { |
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416 | $hr->{svval} .= cstring($sv->PV); |
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417 | } elsif (class($sv) eq "HV") { |
418 | $hr->{svval} .= 'HASH'; |
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419 | } |
420 | return $hr->{svclass} . " " . $hr->{svval}; |
421 | } |
422 | } |
423 | |
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424 | sub concise_op { |
425 | my ($op, $level, $format) = @_; |
426 | my %h; |
427 | $h{exname} = $h{name} = $op->name; |
428 | $h{NAME} = uc $h{name}; |
429 | $h{class} = class($op); |
430 | $h{extarg} = $h{targ} = $op->targ; |
431 | $h{extarg} = "" unless $h{extarg}; |
432 | if ($h{name} eq "null" and $h{targ}) { |
433 | $h{exname} = "ex-" . substr(ppname($h{targ}), 3); |
434 | $h{extarg} = ""; |
435 | } elsif ($h{targ}) { |
436 | my $padname = (($curcv->PADLIST->ARRAY)[0]->ARRAY)[$h{targ}]; |
437 | if (defined $padname and class($padname) ne "SPECIAL") { |
0b40bd6d |
438 | $h{targarg} = $padname->PVX; |
c99ca59a |
439 | my $intro = $padname->NVX - $cop_seq_base; |
440 | my $finish = int($padname->IVX) - $cop_seq_base; |
441 | $finish = "end" if $finish == 999999999 - $cop_seq_base; |
442 | $h{targarglife} = "$h{targarg}:$intro,$finish"; |
443 | } else { |
444 | $h{targarglife} = $h{targarg} = "t" . $h{targ}; |
445 | } |
446 | } |
447 | $h{arg} = ""; |
448 | $h{svclass} = $h{svaddr} = $h{svval} = ""; |
449 | if ($h{class} eq "PMOP") { |
450 | my $precomp = $op->precomp; |
7a9b44b9 |
451 | if (defined $precomp) { |
c27ea44e |
452 | $precomp = cstring($precomp); # Escape literal control sequences |
453 | $precomp = "/$precomp/"; |
454 | } else { |
455 | $precomp = ""; |
7a9b44b9 |
456 | } |
b2a3cfdd |
457 | my $pmreplroot = $op->pmreplroot; |
34a48b4b |
458 | my $pmreplstart; |
31b49ad4 |
459 | if ($pmreplroot && $$pmreplroot && $pmreplroot->isa("B::GV")) { |
b2a3cfdd |
460 | # with C<@stash_array = split(/pat/, str);>, |
461 | # *stash_array is stored in pmreplroot. |
462 | $h{arg} = "($precomp => \@" . $pmreplroot->NAME . ")"; |
463 | } elsif ($ {$op->pmreplstart}) { |
c99ca59a |
464 | undef $lastnext; |
465 | $pmreplstart = "replstart->" . seq($op->pmreplstart); |
466 | $h{arg} = "(" . join(" ", $precomp, $pmreplstart) . ")"; |
467 | } else { |
468 | $h{arg} = "($precomp)"; |
469 | } |
470 | } elsif ($h{class} eq "PVOP" and $h{name} ne "trans") { |
471 | $h{arg} = '("' . $op->pv . '")'; |
472 | $h{svval} = '"' . $op->pv . '"'; |
473 | } elsif ($h{class} eq "COP") { |
474 | my $label = $op->label; |
c3caa09d |
475 | $h{coplabel} = $label; |
c99ca59a |
476 | $label = $label ? "$label: " : ""; |
477 | my $loc = $op->file; |
478 | $loc =~ s[.*/][]; |
479 | $loc .= ":" . $op->line; |
480 | my($stash, $cseq) = ($op->stash->NAME, $op->cop_seq - $cop_seq_base); |
481 | my $arybase = $op->arybase; |
482 | $arybase = $arybase ? ' $[=' . $arybase : ""; |
483 | $h{arg} = "($label$stash $cseq $loc$arybase)"; |
484 | } elsif ($h{class} eq "LOOP") { |
485 | $h{arg} = "(next->" . seq($op->nextop) . " last->" . seq($op->lastop) |
486 | . " redo->" . seq($op->redoop) . ")"; |
487 | } elsif ($h{class} eq "LOGOP") { |
488 | undef $lastnext; |
489 | $h{arg} = "(other->" . seq($op->other) . ")"; |
490 | } elsif ($h{class} eq "SVOP") { |
c27ea44e |
491 | if (! ${$op->sv}) { |
492 | my $sv = (($curcv->PADLIST->ARRAY)[1]->ARRAY)[$op->targ]; |
493 | $h{arg} = "[" . concise_sv($sv, \%h) . "]"; |
494 | $h{targarglife} = $h{targarg} = ""; |
c99ca59a |
495 | } else { |
c27ea44e |
496 | $h{arg} = "(" . concise_sv($op->sv, \%h) . ")"; |
c99ca59a |
497 | } |
31b49ad4 |
498 | } elsif ($h{class} eq "PADOP") { |
499 | my $sv = (($curcv->PADLIST->ARRAY)[1]->ARRAY)[$op->padix]; |
500 | $h{arg} = "[" . concise_sv($sv, \%h) . "]"; |
c99ca59a |
501 | } |
502 | $h{seq} = $h{hyphseq} = seq($op); |
503 | $h{seq} = "" if $h{seq} eq "-"; |
504 | $h{seqnum} = $op->seq; |
505 | $h{next} = $op->next; |
506 | $h{next} = (class($h{next}) eq "NULL") ? "(end)" : seq($h{next}); |
507 | $h{nextaddr} = sprintf("%#x", $ {$op->next}); |
508 | $h{sibaddr} = sprintf("%#x", $ {$op->sibling}); |
509 | $h{firstaddr} = sprintf("%#x", $ {$op->first}) if $op->can("first"); |
510 | $h{lastaddr} = sprintf("%#x", $ {$op->last}) if $op->can("last"); |
511 | |
512 | $h{classsym} = $opclass{$h{class}}; |
513 | $h{flagval} = $op->flags; |
514 | $h{flags} = op_flags($op->flags); |
515 | $h{privval} = $op->private; |
516 | $h{private} = private_flags($h{name}, $op->private); |
517 | $h{addr} = sprintf("%#x", $$op); |
518 | $h{label} = $labels{$op->seq}; |
519 | $h{typenum} = $op->type; |
520 | $h{noise} = $linenoise[$op->type]; |
78ad9108 |
521 | $_->(\%h, $op, \$format, \$level) for @callbacks; |
c99ca59a |
522 | return fmt_line(\%h, $format, $level); |
523 | } |
524 | |
525 | sub B::OP::concise { |
526 | my($op, $level) = @_; |
527 | if ($order eq "exec" and $lastnext and $$lastnext != $$op) { |
528 | my $h = {"seq" => seq($lastnext), "class" => class($lastnext), |
529 | "addr" => sprintf("%#x", $$lastnext)}; |
530 | print fmt_line($h, $gotofmt, $level+1); |
531 | } |
532 | $lastnext = $op->next; |
533 | print concise_op($op, $level, $format); |
534 | } |
535 | |
31b49ad4 |
536 | # B::OP::terse (see Terse.pm) now just calls this |
537 | sub b_terse { |
538 | my($op, $level) = @_; |
539 | |
540 | # This isn't necessarily right, but there's no easy way to get |
541 | # from an OP to the right CV. This is a limitation of the |
542 | # ->terse() interface style, and there isn't much to do about |
543 | # it. In particular, we can die in concise_op if the main pad |
544 | # isn't long enough, or has the wrong kind of entries, compared to |
545 | # the pad a sub was compiled with. The fix for that would be to |
546 | # make a backwards compatible "terse" format that never even |
547 | # looked at the pad, just like the old B::Terse. I don't think |
548 | # that's worth the effort, though. |
549 | $curcv = main_cv unless $curcv; |
550 | |
551 | if ($order eq "exec" and $lastnext and $$lastnext != $$op) { |
552 | my $h = {"seq" => seq($lastnext), "class" => class($lastnext), |
553 | "addr" => sprintf("%#x", $$lastnext)}; |
554 | print fmt_line($h, $style{"terse"}[1], $level+1); |
555 | } |
556 | $lastnext = $op->next; |
557 | print concise_op($op, $level, $style{"terse"}[0]); |
558 | } |
559 | |
c99ca59a |
560 | sub tree { |
561 | my $op = shift; |
562 | my $level = shift; |
563 | my $style = $tree_decorations[$tree_style]; |
564 | my($space, $single, $kids, $kid, $nokid, $last, $lead, $size) = @$style; |
565 | my $name = concise_op($op, $level, $treefmt); |
566 | if (not $op->flags & OPf_KIDS) { |
567 | return $name . "\n"; |
568 | } |
569 | my @lines; |
570 | for (my $kid = $op->first; $$kid; $kid = $kid->sibling) { |
571 | push @lines, tree($kid, $level+1); |
572 | } |
573 | my $i; |
574 | for ($i = $#lines; substr($lines[$i], 0, 1) eq " "; $i--) { |
575 | $lines[$i] = $space . $lines[$i]; |
576 | } |
577 | if ($i > 0) { |
578 | $lines[$i] = $last . $lines[$i]; |
579 | while ($i-- > 1) { |
580 | if (substr($lines[$i], 0, 1) eq " ") { |
581 | $lines[$i] = $nokid . $lines[$i]; |
582 | } else { |
583 | $lines[$i] = $kid . $lines[$i]; |
584 | } |
585 | } |
586 | $lines[$i] = $kids . $lines[$i]; |
587 | } else { |
588 | $lines[0] = $single . $lines[0]; |
589 | } |
590 | return("$name$lead" . shift @lines, |
591 | map(" " x (length($name)+$size) . $_, @lines)); |
592 | } |
593 | |
213a1a26 |
594 | # *** Warning: fragile kludge ahead *** |
595 | # Because the B::* modules run in the same interpreter as the code |
596 | # they're compiling, their presence tends to distort the view we have |
597 | # of the code we're looking at. In particular, perl gives sequence |
598 | # numbers to both OPs in general and COPs in particular. If the |
599 | # program we're looking at were run on its own, these numbers would |
600 | # start at 1. Because all of B::Concise and all the modules it uses |
601 | # are compiled first, though, by the time we get to the user's program |
602 | # the sequence numbers are alreay at pretty high numbers, which would |
603 | # be distracting if you're trying to tell OPs apart. Therefore we'd |
604 | # like to subtract an offset from all the sequence numbers we display, |
605 | # to restore the simpler view of the world. The trick is to know what |
606 | # that offset will be, when we're still compiling B::Concise! If we |
607 | # hardcoded a value, it would have to change every time B::Concise or |
608 | # other modules we use do. To help a little, what we do here is |
609 | # compile a little code at the end of the module, and compute the base |
610 | # sequence number for the user's program as being a small offset |
611 | # later, so all we have to worry about are changes in the offset. |
c27ea44e |
612 | # (Note that we now only play this game with COP sequence numbers. OP |
613 | # sequence numbers aren't used to refer to OPs from a distance, and |
614 | # they don't have much significance, so we just generate our own |
615 | # sequence numbers which are easier to control. This way we also don't |
616 | # stand in the way of a possible future removal of OP sequence |
617 | # numbers). |
213a1a26 |
618 | |
619 | # When you say "perl -MO=Concise -e '$a'", the output should look like: |
620 | |
621 | # 4 <@> leave[t1] vKP/REFC ->(end) |
622 | # 1 <0> enter ->2 |
623 | #^ smallest OP sequence number should be 1 |
624 | # 2 <;> nextstate(main 1 -e:1) v ->3 |
625 | # ^ smallest COP sequence number should be 1 |
626 | # - <1> ex-rv2sv vK/1 ->4 |
627 | # 3 <$> gvsv(*a) s ->4 |
628 | |
c27ea44e |
629 | # If the second of the marked numbers there isn't 1, it means you need |
630 | # to update the corresponding magic number in the next line. |
631 | # Remember, this needs to stay the last things in the module. |
e69a2255 |
632 | |
c27ea44e |
633 | # Why is this different for MacOS? Does it matter? |
634 | my $cop_seq_mnum = $^O eq 'MacOS' ? 10 : 9; |
e69a2255 |
635 | $cop_seq_base = svref_2object(eval 'sub{0;}')->START->cop_seq + $cop_seq_mnum; |
c99ca59a |
636 | |
637 | 1; |
638 | |
639 | __END__ |
640 | |
641 | =head1 NAME |
642 | |
643 | B::Concise - Walk Perl syntax tree, printing concise info about ops |
644 | |
645 | =head1 SYNOPSIS |
646 | |
647 | perl -MO=Concise[,OPTIONS] foo.pl |
648 | |
78ad9108 |
649 | use B::Concise qw(set_style add_callback); |
650 | |
c99ca59a |
651 | =head1 DESCRIPTION |
652 | |
653 | This compiler backend prints the internal OPs of a Perl program's syntax |
654 | tree in one of several space-efficient text formats suitable for debugging |
655 | the inner workings of perl or other compiler backends. It can print OPs in |
656 | the order they appear in the OP tree, in the order they will execute, or |
657 | in a text approximation to their tree structure, and the format of the |
658 | information displyed is customizable. Its function is similar to that of |
659 | perl's B<-Dx> debugging flag or the B<B::Terse> module, but it is more |
660 | sophisticated and flexible. |
661 | |
f8a679e6 |
662 | =head1 EXAMPLE |
663 | |
664 | Here's is a short example of output, using the default formatting |
665 | conventions : |
666 | |
667 | % perl -MO=Concise -e '$a = $b + 42' |
668 | 8 <@> leave[t1] vKP/REFC ->(end) |
669 | 1 <0> enter ->2 |
670 | 2 <;> nextstate(main 1 -e:1) v ->3 |
671 | 7 <2> sassign vKS/2 ->8 |
672 | 5 <2> add[t1] sK/2 ->6 |
673 | - <1> ex-rv2sv sK/1 ->4 |
674 | 3 <$> gvsv(*b) s ->4 |
675 | 4 <$> const(IV 42) s ->5 |
676 | - <1> ex-rv2sv sKRM*/1 ->7 |
677 | 6 <$> gvsv(*a) s ->7 |
678 | |
679 | Each line corresponds to an operator. Null ops appear as C<ex-opname>, |
680 | where I<opname> is the op that has been optimized away by perl. |
681 | |
682 | The number on the first row indicates the op's sequence number. It's |
683 | given in base 36 by default. |
684 | |
685 | The symbol between angle brackets indicates the op's type : for example, |
686 | <2> is a BINOP, <@> a LISTOP, etc. (see L</"OP class abbreviations">). |
687 | |
688 | The opname may be followed by op-specific information in parentheses |
689 | (e.g. C<gvsv(*b)>), and by targ information in brackets (e.g. |
690 | C<leave[t1]>). |
691 | |
692 | Next come the op flags. The common flags are listed below |
693 | (L</"OP flags abbreviations">). The private flags follow, separated |
694 | by a slash. For example, C<vKP/REFC> means that the leave op has |
695 | public flags OPf_WANT_VOID, OPf_KIDS, and OPf_PARENS, and the private |
696 | flag OPpREFCOUNTED. |
697 | |
698 | Finally an arrow points to the sequence number of the next op. |
699 | |
c99ca59a |
700 | =head1 OPTIONS |
701 | |
702 | Arguments that don't start with a hyphen are taken to be the names of |
703 | subroutines to print the OPs of; if no such functions are specified, the |
704 | main body of the program (outside any subroutines, and not including use'd |
705 | or require'd files) is printed. |
706 | |
707 | =over 4 |
708 | |
709 | =item B<-basic> |
710 | |
711 | Print OPs in the order they appear in the OP tree (a preorder |
712 | traversal, starting at the root). The indentation of each OP shows its |
713 | level in the tree. This mode is the default, so the flag is included |
714 | simply for completeness. |
715 | |
716 | =item B<-exec> |
717 | |
718 | Print OPs in the order they would normally execute (for the majority |
719 | of constructs this is a postorder traversal of the tree, ending at the |
720 | root). In most cases the OP that usually follows a given OP will |
721 | appear directly below it; alternate paths are shown by indentation. In |
722 | cases like loops when control jumps out of a linear path, a 'goto' |
723 | line is generated. |
724 | |
725 | =item B<-tree> |
726 | |
727 | Print OPs in a text approximation of a tree, with the root of the tree |
728 | at the left and 'left-to-right' order of children transformed into |
729 | 'top-to-bottom'. Because this mode grows both to the right and down, |
730 | it isn't suitable for large programs (unless you have a very wide |
731 | terminal). |
732 | |
733 | =item B<-compact> |
734 | |
735 | Use a tree format in which the minimum amount of space is used for the |
736 | lines connecting nodes (one character in most cases). This squeezes out |
737 | a few precious columns of screen real estate. |
738 | |
739 | =item B<-loose> |
740 | |
741 | Use a tree format that uses longer edges to separate OP nodes. This format |
742 | tends to look better than the compact one, especially in ASCII, and is |
743 | the default. |
744 | |
745 | =item B<-vt> |
746 | |
747 | Use tree connecting characters drawn from the VT100 line-drawing set. |
748 | This looks better if your terminal supports it. |
749 | |
750 | =item B<-ascii> |
751 | |
752 | Draw the tree with standard ASCII characters like C<+> and C<|>. These don't |
753 | look as clean as the VT100 characters, but they'll work with almost any |
754 | terminal (or the horizontal scrolling mode of less(1)) and are suitable |
755 | for text documentation or email. This is the default. |
756 | |
757 | =item B<-main> |
758 | |
759 | Include the main program in the output, even if subroutines were also |
760 | specified. |
761 | |
762 | =item B<-base>I<n> |
763 | |
764 | Print OP sequence numbers in base I<n>. If I<n> is greater than 10, the |
765 | digit for 11 will be 'a', and so on. If I<n> is greater than 36, the digit |
766 | for 37 will be 'A', and so on until 62. Values greater than 62 are not |
767 | currently supported. The default is 36. |
768 | |
769 | =item B<-bigendian> |
770 | |
771 | Print sequence numbers with the most significant digit first. This is the |
772 | usual convention for Arabic numerals, and the default. |
773 | |
774 | =item B<-littleendian> |
775 | |
776 | Print seqence numbers with the least significant digit first. |
777 | |
778 | =item B<-concise> |
779 | |
780 | Use the author's favorite set of formatting conventions. This is the |
781 | default, of course. |
782 | |
783 | =item B<-terse> |
784 | |
a6d05634 |
785 | Use formatting conventions that emulate the output of B<B::Terse>. The |
c99ca59a |
786 | basic mode is almost indistinguishable from the real B<B::Terse>, and the |
787 | exec mode looks very similar, but is in a more logical order and lacks |
788 | curly brackets. B<B::Terse> doesn't have a tree mode, so the tree mode |
789 | is only vaguely reminiscient of B<B::Terse>. |
790 | |
791 | =item B<-linenoise> |
792 | |
793 | Use formatting conventions in which the name of each OP, rather than being |
794 | written out in full, is represented by a one- or two-character abbreviation. |
795 | This is mainly a joke. |
796 | |
797 | =item B<-debug> |
798 | |
799 | Use formatting conventions reminiscient of B<B::Debug>; these aren't |
800 | very concise at all. |
801 | |
802 | =item B<-env> |
803 | |
804 | Use formatting conventions read from the environment variables |
805 | C<B_CONCISE_FORMAT>, C<B_CONCISE_GOTO_FORMAT>, and C<B_CONCISE_TREE_FORMAT>. |
806 | |
807 | =back |
808 | |
809 | =head1 FORMATTING SPECIFICATIONS |
810 | |
811 | For each general style ('concise', 'terse', 'linenoise', etc.) there are |
812 | three specifications: one of how OPs should appear in the basic or exec |
813 | modes, one of how 'goto' lines should appear (these occur in the exec |
814 | mode only), and one of how nodes should appear in tree mode. Each has the |
815 | same format, described below. Any text that doesn't match a special |
816 | pattern is copied verbatim. |
817 | |
818 | =over 4 |
819 | |
820 | =item B<(x(>I<exec_text>B<;>I<basic_text>B<)x)> |
821 | |
822 | Generates I<exec_text> in exec mode, or I<basic_text> in basic mode. |
823 | |
824 | =item B<(*(>I<text>B<)*)> |
825 | |
826 | Generates one copy of I<text> for each indentation level. |
827 | |
828 | =item B<(*(>I<text1>B<;>I<text2>B<)*)> |
829 | |
830 | Generates one fewer copies of I<text1> than the indentation level, followed |
831 | by one copy of I<text2> if the indentation level is more than 0. |
832 | |
833 | =item B<(?(>I<text1>B<#>I<var>I<Text2>B<)?)> |
834 | |
835 | If the value of I<var> is true (not empty or zero), generates the |
836 | value of I<var> surrounded by I<text1> and I<Text2>, otherwise |
837 | nothing. |
838 | |
839 | =item B<#>I<var> |
840 | |
841 | Generates the value of the variable I<var>. |
842 | |
843 | =item B<#>I<var>I<N> |
844 | |
845 | Generates the value of I<var>, left jutified to fill I<N> spaces. |
846 | |
847 | =item B<~> |
848 | |
849 | Any number of tildes and surrounding whitespace will be collapsed to |
850 | a single space. |
851 | |
852 | =back |
853 | |
854 | The following variables are recognized: |
855 | |
856 | =over 4 |
857 | |
858 | =item B<#addr> |
859 | |
860 | The address of the OP, in hexidecimal. |
861 | |
862 | =item B<#arg> |
863 | |
864 | The OP-specific information of the OP (such as the SV for an SVOP, the |
865 | non-local exit pointers for a LOOP, etc.) enclosed in paretheses. |
866 | |
867 | =item B<#class> |
868 | |
869 | The B-determined class of the OP, in all caps. |
870 | |
f8a679e6 |
871 | =item B<#classsym> |
c99ca59a |
872 | |
873 | A single symbol abbreviating the class of the OP. |
874 | |
c3caa09d |
875 | =item B<#coplabel> |
876 | |
877 | The label of the statement or block the OP is the start of, if any. |
878 | |
c99ca59a |
879 | =item B<#exname> |
880 | |
881 | The name of the OP, or 'ex-foo' if the OP is a null that used to be a foo. |
882 | |
883 | =item B<#extarg> |
884 | |
885 | The target of the OP, or nothing for a nulled OP. |
886 | |
887 | =item B<#firstaddr> |
888 | |
889 | The address of the OP's first child, in hexidecimal. |
890 | |
891 | =item B<#flags> |
892 | |
893 | The OP's flags, abbreviated as a series of symbols. |
894 | |
895 | =item B<#flagval> |
896 | |
897 | The numeric value of the OP's flags. |
898 | |
f8a679e6 |
899 | =item B<#hyphseq> |
c99ca59a |
900 | |
901 | The sequence number of the OP, or a hyphen if it doesn't have one. |
902 | |
903 | =item B<#label> |
904 | |
905 | 'NEXT', 'LAST', or 'REDO' if the OP is a target of one of those in exec |
906 | mode, or empty otherwise. |
907 | |
908 | =item B<#lastaddr> |
909 | |
910 | The address of the OP's last child, in hexidecimal. |
911 | |
912 | =item B<#name> |
913 | |
914 | The OP's name. |
915 | |
916 | =item B<#NAME> |
917 | |
918 | The OP's name, in all caps. |
919 | |
920 | =item B<#next> |
921 | |
922 | The sequence number of the OP's next OP. |
923 | |
924 | =item B<#nextaddr> |
925 | |
926 | The address of the OP's next OP, in hexidecimal. |
927 | |
928 | =item B<#noise> |
929 | |
c27ea44e |
930 | A one- or two-character abbreviation for the OP's name. |
c99ca59a |
931 | |
932 | =item B<#private> |
933 | |
934 | The OP's private flags, rendered with abbreviated names if possible. |
935 | |
936 | =item B<#privval> |
937 | |
938 | The numeric value of the OP's private flags. |
939 | |
940 | =item B<#seq> |
941 | |
c27ea44e |
942 | The sequence number of the OP. Note that this is now a sequence number |
943 | generated by B::Concise, rather than the real op_seq value (for which |
944 | see B<#seqnum>). |
c99ca59a |
945 | |
946 | =item B<#seqnum> |
947 | |
948 | The real sequence number of the OP, as a regular number and not adjusted |
949 | to be relative to the start of the real program. (This will generally be |
950 | a fairly large number because all of B<B::Concise> is compiled before |
951 | your program is). |
952 | |
953 | =item B<#sibaddr> |
954 | |
955 | The address of the OP's next youngest sibling, in hexidecimal. |
956 | |
957 | =item B<#svaddr> |
958 | |
959 | The address of the OP's SV, if it has an SV, in hexidecimal. |
960 | |
961 | =item B<#svclass> |
962 | |
963 | The class of the OP's SV, if it has one, in all caps (e.g., 'IV'). |
964 | |
965 | =item B<#svval> |
966 | |
967 | The value of the OP's SV, if it has one, in a short human-readable format. |
968 | |
969 | =item B<#targ> |
970 | |
971 | The numeric value of the OP's targ. |
972 | |
973 | =item B<#targarg> |
974 | |
975 | The name of the variable the OP's targ refers to, if any, otherwise the |
976 | letter t followed by the OP's targ in decimal. |
977 | |
978 | =item B<#targarglife> |
979 | |
980 | Same as B<#targarg>, but followed by the COP sequence numbers that delimit |
981 | the variable's lifetime (or 'end' for a variable in an open scope) for a |
982 | variable. |
983 | |
984 | =item B<#typenum> |
985 | |
986 | The numeric value of the OP's type, in decimal. |
987 | |
988 | =back |
989 | |
990 | =head1 ABBREVIATIONS |
991 | |
992 | =head2 OP flags abbreviations |
993 | |
994 | v OPf_WANT_VOID Want nothing (void context) |
995 | s OPf_WANT_SCALAR Want single value (scalar context) |
996 | l OPf_WANT_LIST Want list of any length (list context) |
997 | K OPf_KIDS There is a firstborn child. |
998 | P OPf_PARENS This operator was parenthesized. |
999 | (Or block needs explicit scope entry.) |
1000 | R OPf_REF Certified reference. |
1001 | (Return container, not containee). |
1002 | M OPf_MOD Will modify (lvalue). |
1003 | S OPf_STACKED Some arg is arriving on the stack. |
1004 | * OPf_SPECIAL Do something weird for this op (see op.h) |
1005 | |
1006 | =head2 OP class abbreviations |
1007 | |
1008 | 0 OP (aka BASEOP) An OP with no children |
1009 | 1 UNOP An OP with one child |
1010 | 2 BINOP An OP with two children |
1011 | | LOGOP A control branch OP |
1012 | @ LISTOP An OP that could have lots of children |
1013 | / PMOP An OP with a regular expression |
1014 | $ SVOP An OP with an SV |
1015 | " PVOP An OP with a string |
1016 | { LOOP An OP that holds pointers for a loop |
1017 | ; COP An OP that marks the start of a statement |
051f02e9 |
1018 | # PADOP An OP with a GV on the pad |
c99ca59a |
1019 | |
78ad9108 |
1020 | =head1 Using B::Concise outside of the O framework |
1021 | |
1022 | It is possible to extend B<B::Concise> by using it outside of the B<O> |
1023 | framework and providing new styles and new variables. |
1024 | |
1025 | use B::Concise qw(set_style add_callback); |
1026 | set_style($format, $gotofmt, $treefmt); |
1027 | add_callback |
1028 | ( |
1029 | sub |
1030 | { |
1031 | my ($h, $op, $level, $format) = @_; |
1032 | $h->{variable} = some_func($op); |
1033 | } |
1034 | ); |
1035 | B::Concise::compile(@options)->(); |
1036 | |
1037 | You can specify a style by calling the B<set_style> subroutine. If you |
1038 | have a new variable in your style, or you want to change the value of an |
1039 | existing variable, you will need to add a callback to specify the value |
1040 | for that variable. |
1041 | |
1042 | This is done by calling B<add_callback> passing references to any |
1043 | callback subroutines. The subroutines are called in the same order as |
1044 | they are added. Each subroutine is passed four parameters. These are a |
1045 | reference to a hash, the keys of which are the names of the variables |
1046 | and the values of which are their values, the op, the level and the |
1047 | format. |
1048 | |
1049 | To define your own variables, simply add them to the hash, or change |
1050 | existing values if you need to. The level and format are passed in as |
1051 | references to scalars, but it is unlikely that they will need to be |
1052 | changed or even used. |
1053 | |
31b49ad4 |
1054 | To switch back to one of the standard styles like C<concise> or |
1055 | C<terse>, use C<set_style_standard>. |
1056 | |
78ad9108 |
1057 | To see the output, call the subroutine returned by B<compile> in the |
1058 | same way that B<O> does. |
1059 | |
c99ca59a |
1060 | =head1 AUTHOR |
1061 | |
31b49ad4 |
1062 | Stephen McCamant, E<lt>smcc@CSUA.Berkeley.EDUE<gt>. |
c99ca59a |
1063 | |
1064 | =cut |