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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 | # Note: we need to keep track of how many use declarations/BEGIN |
7 | # blocks this module uses, so we can avoid printing them when user |
8 | # asks for the BEGIN blocks in her program. Update the comments and |
9 | # the count in concise_specials if you add or delete one. The |
10 | # -MO=Concise counts as use #1. |
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11 | |
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12 | use strict; # use #2 |
13 | use warnings; # uses #3 and #4, since warnings uses Carp |
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14 | |
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15 | use Exporter (); # use #5 |
16 | |
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17 | our $VERSION = "0.71"; |
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18 | our @ISA = qw(Exporter); |
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19 | our @EXPORT_OK = qw( set_style set_style_standard add_callback |
20 | concise_subref concise_cv concise_main |
21 | add_style walk_output compile reset_sequence ); |
22 | our %EXPORT_TAGS = |
23 | ( io => [qw( walk_output compile reset_sequence )], |
24 | style => [qw( add_style set_style_standard )], |
25 | cb => [qw( add_callback )], |
26 | mech => [qw( concise_subref concise_cv concise_main )], ); |
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27 | |
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28 | # use #6 |
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29 | use B qw(class ppname main_start main_root main_cv cstring svref_2object |
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30 | SVf_IOK SVf_NOK SVf_POK SVf_IVisUV SVf_FAKE OPf_KIDS OPf_SPECIAL |
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31 | CVf_ANON PAD_FAKELEX_ANON PAD_FAKELEX_MULTI); |
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32 | |
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33 | my %style = |
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34 | ("terse" => |
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35 | ["(?(#label =>\n)?)(*( )*)#class (#addr) #name (?([#targ])?) " |
36 | . "#svclass~(?((#svaddr))?)~#svval~(?(label \"#coplabel\")?)\n", |
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37 | "(*( )*)goto #class (#addr)\n", |
38 | "#class pp_#name"], |
39 | "concise" => |
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40 | ["#hyphseq2 (*( (x( ;)x))*)<#classsym> #exname#arg(?([#targarglife])?)" |
41 | . "~#flags(?(/#private)?)(?(:#hints)?)(x(;~->#next)x)\n" |
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42 | , " (*( )*) goto #seq\n", |
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43 | "(?(<#seq>)?)#exname#arg(?([#targarglife])?)"], |
44 | "linenoise" => |
45 | ["(x(;(*( )*))x)#noise#arg(?([#targarg])?)(x( ;\n)x)", |
46 | "gt_#seq ", |
47 | "(?(#seq)?)#noise#arg(?([#targarg])?)"], |
48 | "debug" => |
49 | ["#class (#addr)\n\top_next\t\t#nextaddr\n\top_sibling\t#sibaddr\n\t" |
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50 | . "op_ppaddr\tPL_ppaddr[OP_#NAME]\n\top_type\t\t#typenum\n" . |
51 | ($] > 5.009 ? '' : "\top_seq\t\t#seqnum\n") |
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52 | . "\top_flags\t#flagval\n\top_private\t#privval\t#hintsval\n" |
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53 | . "(?(\top_first\t#firstaddr\n)?)(?(\top_last\t\t#lastaddr\n)?)" |
54 | . "(?(\top_sv\t\t#svaddr\n)?)", |
55 | " GOTO #addr\n", |
56 | "#addr"], |
57 | "env" => [$ENV{B_CONCISE_FORMAT}, $ENV{B_CONCISE_GOTO_FORMAT}, |
58 | $ENV{B_CONCISE_TREE_FORMAT}], |
59 | ); |
60 | |
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61 | # Renderings, ie how Concise prints, is controlled by these vars |
62 | # primary: |
63 | our $stylename; # selects current style from %style |
64 | my $order = "basic"; # how optree is walked & printed: basic, exec, tree |
65 | |
66 | # rendering mechanics: |
67 | # these 'formats' are the line-rendering templates |
68 | # they're updated from %style when $stylename changes |
69 | my ($format, $gotofmt, $treefmt); |
70 | |
71 | # lesser players: |
72 | my $base = 36; # how <sequence#> is displayed |
73 | my $big_endian = 1; # more <sequence#> display |
74 | my $tree_style = 0; # tree-order details |
75 | my $banner = 1; # print banner before optree is traversed |
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76 | my $do_main = 0; # force printing of main routine |
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77 | |
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78 | # another factor: can affect all styles! |
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79 | our @callbacks; # allow external management |
80 | |
81 | set_style_standard("concise"); |
82 | |
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83 | my $curcv; |
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84 | my $cop_seq_base; |
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85 | |
86 | sub set_style { |
87 | ($format, $gotofmt, $treefmt) = @_; |
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88 | #warn "set_style: deprecated, use set_style_standard instead\n"; # someday |
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89 | die "expecting 3 style-format args\n" unless @_ == 3; |
90 | } |
91 | |
92 | sub add_style { |
93 | my ($newstyle,@args) = @_; |
94 | die "style '$newstyle' already exists, choose a new name\n" |
95 | if exists $style{$newstyle}; |
96 | die "expecting 3 style-format args\n" unless @args == 3; |
97 | $style{$newstyle} = [@args]; |
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98 | $stylename = $newstyle; # update rendering state |
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99 | } |
100 | |
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101 | sub set_style_standard { |
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102 | ($stylename) = @_; # update rendering state |
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103 | die "err: style '$stylename' unknown\n" unless exists $style{$stylename}; |
104 | set_style(@{$style{$stylename}}); |
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105 | } |
106 | |
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107 | sub add_callback { |
108 | push @callbacks, @_; |
109 | } |
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110 | |
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111 | # output handle, used with all Concise-output printing |
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112 | our $walkHandle; # public for your convenience |
113 | BEGIN { $walkHandle = \*STDOUT } |
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114 | |
115 | sub walk_output { # updates $walkHandle |
116 | my $handle = shift; |
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117 | return $walkHandle unless $handle; # allow use as accessor |
118 | |
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119 | if (ref $handle eq 'SCALAR') { |
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120 | require Config; |
121 | die "no perlio in this build, can't call walk_output (\\\$scalar)\n" |
122 | unless $Config::Config{useperlio}; |
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123 | # in 5.8+, open(FILEHANDLE,MODE,REFERENCE) writes to string |
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124 | open my $tmp, '>', $handle; # but cant re-set existing STDOUT |
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125 | $walkHandle = $tmp; # so use my $tmp as intermediate var |
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126 | return $walkHandle; |
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127 | } |
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128 | my $iotype = ref $handle; |
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129 | die "expecting argument/object that can print\n" |
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130 | unless $iotype eq 'GLOB' or $iotype and $handle->can('print'); |
131 | $walkHandle = $handle; |
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132 | } |
133 | |
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134 | sub concise_subref { |
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135 | my($order, $coderef, $name) = @_; |
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136 | my $codeobj = svref_2object($coderef); |
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137 | |
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138 | return concise_stashref(@_) |
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139 | unless ref $codeobj eq 'B::CV'; |
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140 | concise_cv_obj($order, $codeobj, $name); |
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141 | } |
142 | |
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143 | sub concise_stashref { |
144 | my($order, $h) = @_; |
145 | foreach my $k (sort keys %$h) { |
146 | local *s = $h->{$k}; |
147 | my $coderef = *s{CODE} or next; |
148 | reset_sequence(); |
149 | print "FUNC: ", *s, "\n"; |
150 | my $codeobj = svref_2object($coderef); |
151 | next unless ref $codeobj eq 'B::CV'; |
152 | eval { concise_cv_obj($order, $codeobj) } |
153 | or warn "err $@ on $codeobj"; |
154 | } |
155 | } |
156 | |
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157 | # This should have been called concise_subref, but it was exported |
158 | # under this name in versions before 0.56 |
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159 | *concise_cv = \&concise_subref; |
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160 | |
161 | sub concise_cv_obj { |
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162 | my ($order, $cv, $name) = @_; |
163 | # name is either a string, or a CODE ref (copy of $cv arg??) |
164 | |
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165 | $curcv = $cv; |
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166 | |
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167 | if (ref($cv->XSUBANY) =~ /B::(\w+)/) { |
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168 | print $walkHandle "$name is a constant sub, optimized to a $1\n"; |
169 | return; |
170 | } |
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171 | if ($cv->XSUB) { |
172 | print $walkHandle "$name is XS code\n"; |
173 | return; |
174 | } |
175 | if (class($cv->START) eq "NULL") { |
176 | no strict 'refs'; |
177 | if (ref $name eq 'CODE') { |
178 | print $walkHandle "coderef $name has no START\n"; |
179 | } |
180 | elsif (exists &$name) { |
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181 | print $walkHandle "$name exists in stash, but has no START\n"; |
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182 | } |
183 | else { |
184 | print $walkHandle "$name not in symbol table\n"; |
185 | } |
186 | return; |
187 | } |
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188 | sequence($cv->START); |
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189 | if ($order eq "exec") { |
190 | walk_exec($cv->START); |
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191 | } |
192 | elsif ($order eq "basic") { |
193 | # walk_topdown($cv->ROOT, sub { $_[0]->concise($_[1]) }, 0); |
194 | my $root = $cv->ROOT; |
195 | unless (ref $root eq 'B::NULL') { |
196 | walk_topdown($root, sub { $_[0]->concise($_[1]) }, 0); |
197 | } else { |
198 | print $walkHandle "B::NULL encountered doing ROOT on $cv. avoiding disaster\n"; |
199 | } |
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200 | } else { |
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201 | print $walkHandle tree($cv->ROOT, 0); |
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202 | } |
203 | } |
204 | |
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205 | sub concise_main { |
206 | my($order) = @_; |
207 | sequence(main_start); |
208 | $curcv = main_cv; |
209 | if ($order eq "exec") { |
210 | return if class(main_start) eq "NULL"; |
211 | walk_exec(main_start); |
212 | } elsif ($order eq "tree") { |
213 | return if class(main_root) eq "NULL"; |
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214 | print $walkHandle tree(main_root, 0); |
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215 | } elsif ($order eq "basic") { |
216 | return if class(main_root) eq "NULL"; |
217 | walk_topdown(main_root, |
218 | sub { $_[0]->concise($_[1]) }, 0); |
219 | } |
220 | } |
221 | |
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222 | sub concise_specials { |
223 | my($name, $order, @cv_s) = @_; |
224 | my $i = 1; |
225 | if ($name eq "BEGIN") { |
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226 | splice(@cv_s, 0, 8); # skip 7 BEGIN blocks in this file. NOW 8 ?? |
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227 | } elsif ($name eq "CHECK") { |
228 | pop @cv_s; # skip the CHECK block that calls us |
229 | } |
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230 | for my $cv (@cv_s) { |
231 | print $walkHandle "$name $i:\n"; |
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232 | $i++; |
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233 | concise_cv_obj($order, $cv, $name); |
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234 | } |
235 | } |
236 | |
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237 | my $start_sym = "\e(0"; # "\cN" sometimes also works |
238 | my $end_sym = "\e(B"; # "\cO" respectively |
239 | |
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240 | my @tree_decorations = |
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241 | ([" ", "--", "+-", "|-", "| ", "`-", "-", 1], |
242 | [" ", "-", "+", "+", "|", "`", "", 0], |
243 | [" ", map("$start_sym$_$end_sym", "qq", "wq", "tq", "x ", "mq", "q"), 1], |
244 | [" ", map("$start_sym$_$end_sym", "q", "w", "t", "x", "m"), "", 0], |
245 | ); |
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246 | |
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247 | |
248 | sub compileOpts { |
249 | # set rendering state from options and args |
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250 | my (@options,@args); |
251 | if (@_) { |
252 | @options = grep(/^-/, @_); |
253 | @args = grep(!/^-/, @_); |
254 | } |
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255 | for my $o (@options) { |
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256 | # mode/order |
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257 | if ($o eq "-basic") { |
258 | $order = "basic"; |
259 | } elsif ($o eq "-exec") { |
260 | $order = "exec"; |
261 | } elsif ($o eq "-tree") { |
262 | $order = "tree"; |
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263 | } |
264 | # tree-specific |
265 | elsif ($o eq "-compact") { |
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266 | $tree_style |= 1; |
267 | } elsif ($o eq "-loose") { |
268 | $tree_style &= ~1; |
269 | } elsif ($o eq "-vt") { |
270 | $tree_style |= 2; |
271 | } elsif ($o eq "-ascii") { |
272 | $tree_style &= ~2; |
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273 | } |
274 | # sequence numbering |
275 | elsif ($o =~ /^-base(\d+)$/) { |
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276 | $base = $1; |
277 | } elsif ($o eq "-bigendian") { |
278 | $big_endian = 1; |
279 | } elsif ($o eq "-littleendian") { |
280 | $big_endian = 0; |
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281 | } |
282 | elsif ($o eq "-nobanner") { |
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283 | $banner = 0; |
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284 | } elsif ($o eq "-banner") { |
285 | $banner = 1; |
286 | } |
287 | elsif ($o eq "-main") { |
288 | $do_main = 1; |
289 | } elsif ($o eq "-nomain") { |
290 | $do_main = 0; |
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291 | } |
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292 | # line-style options |
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293 | elsif (exists $style{substr($o, 1)}) { |
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294 | $stylename = substr($o, 1); |
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295 | set_style_standard($stylename); |
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296 | } else { |
297 | warn "Option $o unrecognized"; |
298 | } |
299 | } |
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300 | return (@args); |
301 | } |
302 | |
303 | sub compile { |
304 | my (@args) = compileOpts(@_); |
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305 | return sub { |
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306 | my @newargs = compileOpts(@_); # accept new rendering options |
307 | warn "disregarding non-options: @newargs\n" if @newargs; |
308 | |
309 | for my $objname (@args) { |
59910b6d |
310 | next unless $objname; # skip null args to avoid noisy responses |
311 | |
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312 | if ($objname eq "BEGIN") { |
313 | concise_specials("BEGIN", $order, |
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314 | B::begin_av->isa("B::AV") ? |
315 | B::begin_av->ARRAY : ()); |
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316 | } elsif ($objname eq "INIT") { |
317 | concise_specials("INIT", $order, |
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318 | B::init_av->isa("B::AV") ? |
319 | B::init_av->ARRAY : ()); |
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320 | } elsif ($objname eq "CHECK") { |
321 | concise_specials("CHECK", $order, |
c0939cee |
322 | B::check_av->isa("B::AV") ? |
323 | B::check_av->ARRAY : ()); |
676456c2 |
324 | } elsif ($objname eq "UNITCHECK") { |
325 | concise_specials("UNITCHECK", $order, |
326 | B::unitcheck_av->isa("B::AV") ? |
327 | B::unitcheck_av->ARRAY : ()); |
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328 | } elsif ($objname eq "END") { |
329 | concise_specials("END", $order, |
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330 | B::end_av->isa("B::AV") ? |
331 | B::end_av->ARRAY : ()); |
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332 | } |
333 | else { |
334 | # convert function names to subrefs |
335 | my $objref; |
336 | if (ref $objname) { |
337 | print $walkHandle "B::Concise::compile($objname)\n" |
338 | if $banner; |
339 | $objref = $objname; |
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340 | } else { |
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341 | $objname = "main::" . $objname unless $objname =~ /::/; |
342 | print $walkHandle "$objname:\n"; |
343 | no strict 'refs'; |
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344 | unless (exists &$objname) { |
345 | print $walkHandle "err: unknown function ($objname)\n"; |
346 | return; |
347 | } |
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348 | $objref = \&$objname; |
8ec8fbef |
349 | } |
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350 | concise_subref($order, $objref, $objname); |
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351 | } |
352 | } |
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353 | if (!@args or $do_main) { |
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354 | print $walkHandle "main program:\n" if $do_main; |
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355 | concise_main($order); |
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356 | } |
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357 | return @args; # something |
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358 | } |
359 | } |
360 | |
361 | my %labels; |
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362 | my $lastnext; # remembers op-chain, used to insert gotos |
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363 | |
364 | my %opclass = ('OP' => "0", 'UNOP' => "1", 'BINOP' => "2", 'LOGOP' => "|", |
365 | 'LISTOP' => "@", 'PMOP' => "/", 'SVOP' => "\$", 'GVOP' => "*", |
051f02e9 |
366 | 'PVOP' => '"', 'LOOP' => "{", 'COP' => ";", 'PADOP' => "#"); |
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367 | |
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368 | no warnings 'qw'; # "Possible attempt to put comments..."; use #7 |
35fc55f1 |
369 | my @linenoise = |
370 | qw'# () sc ( @? 1 $* gv *{ m$ m@ m% m? p/ *$ $ $# & a& pt \\ s\\ rf bl |
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371 | ` *? <> ?? ?/ r/ c/ // qr s/ /c y/ = @= C sC Cp sp df un BM po +1 +I |
372 | -1 -I 1+ I+ 1- I- ** * i* / i/ %$ i% x + i+ - i- . " << >> < i< |
373 | > i> <= i, >= i. == i= != i! <? i? s< s> s, s. s= s! s? b& b^ b| -0 -i |
374 | ! ~ a2 si cs rd sr e^ lg sq in %x %o ab le ss ve ix ri sf FL od ch cy |
375 | uf lf uc lc qm @ [f [ @[ eh vl ky dl ex % ${ @{ uk pk st jn ) )[ a@ |
376 | a% sl +] -] [- [+ so rv GS GW MS MW .. f. .f && || ^^ ?: &= |= -> s{ s} |
377 | v} ca wa di rs ;; ; ;d }{ { } {} f{ it {l l} rt }l }n }r dm }g }e ^o |
378 | ^c ^| ^# um bm t~ u~ ~d DB db ^s se ^g ^r {w }w pf pr ^O ^K ^R ^W ^d ^v |
379 | ^e ^t ^k t. fc ic fl .s .p .b .c .l .a .h g1 s1 g2 s2 ?. l? -R -W -X -r |
380 | -w -x -e -o -O -z -s -M -A -C -S -c -b -f -d -p -l -u -g -k -t -T -B cd |
381 | co cr u. cm ut r. l@ s@ r@ mD uD oD rD tD sD wD cD f$ w$ p$ sh e$ k$ g3 |
382 | g4 s4 g5 s5 T@ C@ L@ G@ A@ S@ Hg Hc Hr Hw Mg Mc Ms Mr Sg Sc So rq do {e |
383 | e} {t t} g6 G6 6e g7 G7 7e g8 G8 8e g9 G9 9e 6s 7s 8s 9s 6E 7E 8E 9E Pn |
c27ea44e |
384 | Pu GP SP EP Gn Gg GG SG EG g0 c$ lk t$ ;s n> // /= CO'; |
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385 | |
386 | my $chars = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"; |
387 | |
19e169bf |
388 | sub op_flags { # common flags (see BASOP.op_flags in op.h) |
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389 | my($x) = @_; |
390 | my(@v); |
391 | push @v, "v" if ($x & 3) == 1; |
392 | push @v, "s" if ($x & 3) == 2; |
393 | push @v, "l" if ($x & 3) == 3; |
394 | push @v, "K" if $x & 4; |
395 | push @v, "P" if $x & 8; |
396 | push @v, "R" if $x & 16; |
397 | push @v, "M" if $x & 32; |
398 | push @v, "S" if $x & 64; |
399 | push @v, "*" if $x & 128; |
400 | return join("", @v); |
401 | } |
402 | |
403 | sub base_n { |
404 | my $x = shift; |
405 | return "-" . base_n(-$x) if $x < 0; |
406 | my $str = ""; |
407 | do { $str .= substr($chars, $x % $base, 1) } while $x = int($x / $base); |
408 | $str = reverse $str if $big_endian; |
409 | return $str; |
410 | } |
411 | |
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412 | my %sequence_num; |
413 | my $seq_max = 1; |
414 | |
f95e3c3c |
415 | sub reset_sequence { |
416 | # reset the sequence |
417 | %sequence_num = (); |
418 | $seq_max = 1; |
cc02ea56 |
419 | $lastnext = 0; |
f95e3c3c |
420 | } |
421 | |
c27ea44e |
422 | sub seq { |
423 | my($op) = @_; |
424 | return "-" if not exists $sequence_num{$$op}; |
425 | return base_n($sequence_num{$$op}); |
426 | } |
c99ca59a |
427 | |
428 | sub walk_topdown { |
429 | my($op, $sub, $level) = @_; |
430 | $sub->($op, $level); |
431 | if ($op->flags & OPf_KIDS) { |
432 | for (my $kid = $op->first; $$kid; $kid = $kid->sibling) { |
433 | walk_topdown($kid, $sub, $level + 1); |
434 | } |
435 | } |
c0939cee |
436 | elsif (class($op) eq "PMOP") { |
c6e79e55 |
437 | my $maybe_root = $op->pmreplroot; |
438 | if (ref($maybe_root) and $maybe_root->isa("B::OP")) { |
439 | # It really is the root of the replacement, not something |
440 | # else stored here for lack of space elsewhere |
441 | walk_topdown($maybe_root, $sub, $level + 1); |
442 | } |
c99ca59a |
443 | } |
444 | } |
445 | |
446 | sub walklines { |
447 | my($ar, $level) = @_; |
448 | for my $l (@$ar) { |
449 | if (ref($l) eq "ARRAY") { |
450 | walklines($l, $level + 1); |
451 | } else { |
452 | $l->concise($level); |
453 | } |
454 | } |
455 | } |
456 | |
457 | sub walk_exec { |
458 | my($top, $level) = @_; |
459 | my %opsseen; |
460 | my @lines; |
461 | my @todo = ([$top, \@lines]); |
462 | while (@todo and my($op, $targ) = @{shift @todo}) { |
463 | for (; $$op; $op = $op->next) { |
464 | last if $opsseen{$$op}++; |
465 | push @$targ, $op; |
466 | my $name = $op->name; |
62e36f8a |
467 | if (class($op) eq "LOGOP") { |
c99ca59a |
468 | my $ar = []; |
469 | push @$targ, $ar; |
470 | push @todo, [$op->other, $ar]; |
471 | } elsif ($name eq "subst" and $ {$op->pmreplstart}) { |
472 | my $ar = []; |
473 | push @$targ, $ar; |
474 | push @todo, [$op->pmreplstart, $ar]; |
475 | } elsif ($name =~ /^enter(loop|iter)$/) { |
7252851f |
476 | if ($] > 5.009) { |
477 | $labels{${$op->nextop}} = "NEXT"; |
478 | $labels{${$op->lastop}} = "LAST"; |
479 | $labels{${$op->redoop}} = "REDO"; |
480 | } else { |
481 | $labels{$op->nextop->seq} = "NEXT"; |
482 | $labels{$op->lastop->seq} = "LAST"; |
483 | $labels{$op->redoop->seq} = "REDO"; |
484 | } |
c99ca59a |
485 | } |
486 | } |
487 | } |
488 | walklines(\@lines, 0); |
489 | } |
490 | |
c27ea44e |
491 | # The structure of this routine is purposely modeled after op.c's peep() |
492 | sub sequence { |
493 | my($op) = @_; |
494 | my $oldop = 0; |
495 | return if class($op) eq "NULL" or exists $sequence_num{$$op}; |
496 | for (; $$op; $op = $op->next) { |
497 | last if exists $sequence_num{$$op}; |
498 | my $name = $op->name; |
499 | if ($name =~ /^(null|scalar|lineseq|scope)$/) { |
500 | next if $oldop and $ {$op->next}; |
501 | } else { |
502 | $sequence_num{$$op} = $seq_max++; |
503 | if (class($op) eq "LOGOP") { |
504 | my $other = $op->other; |
505 | $other = $other->next while $other->name eq "null"; |
506 | sequence($other); |
507 | } elsif (class($op) eq "LOOP") { |
508 | my $redoop = $op->redoop; |
509 | $redoop = $redoop->next while $redoop->name eq "null"; |
510 | sequence($redoop); |
511 | my $nextop = $op->nextop; |
512 | $nextop = $nextop->next while $nextop->name eq "null"; |
513 | sequence($nextop); |
514 | my $lastop = $op->lastop; |
515 | $lastop = $lastop->next while $lastop->name eq "null"; |
516 | sequence($lastop); |
517 | } elsif ($name eq "subst" and $ {$op->pmreplstart}) { |
518 | my $replstart = $op->pmreplstart; |
519 | $replstart = $replstart->next while $replstart->name eq "null"; |
520 | sequence($replstart); |
521 | } |
522 | } |
523 | $oldop = $op; |
524 | } |
525 | } |
526 | |
724aa791 |
527 | sub fmt_line { # generate text-line for op. |
cc02ea56 |
528 | my($hr, $op, $text, $level) = @_; |
529 | |
530 | $_->($hr, $op, \$text, \$level, $stylename) for @callbacks; |
531 | |
724aa791 |
532 | return '' if $hr->{SKIP}; # suppress line if a callback said so |
cc02ea56 |
533 | return '' if $hr->{goto} and $hr->{goto} eq '-'; # no goto nowhere |
f95e3c3c |
534 | |
cc02ea56 |
535 | # spec: (?(text1#varText2)?) |
c99ca59a |
536 | $text =~ s/\(\?\(([^\#]*?)\#(\w+)([^\#]*?)\)\?\)/ |
f95e3c3c |
537 | $hr->{$2} ? $1.$hr->{$2}.$3 : ""/eg; |
538 | |
cc02ea56 |
539 | # spec: (x(exec_text;basic_text)x) |
c99ca59a |
540 | $text =~ s/\(x\((.*?);(.*?)\)x\)/$order eq "exec" ? $1 : $2/egs; |
cc02ea56 |
541 | |
542 | # spec: (*(text)*) |
c99ca59a |
543 | $text =~ s/\(\*\(([^;]*?)\)\*\)/$1 x $level/egs; |
cc02ea56 |
544 | |
545 | # spec: (*(text1;text2)*) |
c99ca59a |
546 | $text =~ s/\(\*\((.*?);(.*?)\)\*\)/$1 x ($level - 1) . $2 x ($level>0)/egs; |
cc02ea56 |
547 | |
548 | # convert #Var to tag=>val form: Var\t#var |
549 | $text =~ s/\#([A-Z][a-z]+)(\d+)?/\t\u$1\t\L#$1$2/gs; |
550 | |
551 | # spec: #varN |
724aa791 |
552 | $text =~ s/\#([a-zA-Z]+)(\d+)/sprintf("%-$2s", $hr->{$1})/eg; |
553 | |
cc02ea56 |
554 | $text =~ s/\#([a-zA-Z]+)/$hr->{$1}/eg; # populate #var's |
555 | $text =~ s/[ \t]*~+[ \t]*/ /g; # squeeze tildes |
f95e3c3c |
556 | chomp $text; |
557 | return "$text\n" if $text ne ""; |
558 | return $text; # suppress empty lines |
c99ca59a |
559 | } |
560 | |
19e169bf |
561 | our %priv; # used to display each opcode's BASEOP.op_private values |
562 | |
c99ca59a |
563 | $priv{$_}{128} = "LVINTRO" |
564 | for ("pos", "substr", "vec", "threadsv", "gvsv", "rv2sv", "rv2hv", "rv2gv", |
565 | "rv2av", "rv2arylen", "aelem", "helem", "aslice", "hslice", "padsv", |
241416b8 |
566 | "padav", "padhv", "enteriter"); |
c99ca59a |
567 | $priv{$_}{64} = "REFC" for ("leave", "leavesub", "leavesublv", "leavewrite"); |
568 | $priv{"aassign"}{64} = "COMMON"; |
461824dc |
569 | $priv{"aassign"}{32} = $] < 5.009 ? "PHASH" : "STATE"; |
952306ac |
570 | $priv{"sassign"}{32} = "STATE"; |
c99ca59a |
571 | $priv{"sassign"}{64} = "BKWARD"; |
7abc42fc |
572 | $priv{$_}{64} = "RTIME" for ("match", "subst", "substcont", "qr"); |
c99ca59a |
573 | @{$priv{"trans"}}{1,2,4,8,16,64} = ("<UTF", ">UTF", "IDENT", "SQUASH", "DEL", |
574 | "COMPL", "GROWS"); |
575 | $priv{"repeat"}{64} = "DOLIST"; |
576 | $priv{"leaveloop"}{64} = "CONT"; |
577 | @{$priv{$_}}{32,64,96} = ("DREFAV", "DREFHV", "DREFSV") |
314d4778 |
578 | for (qw(rv2gv rv2sv padsv aelem helem)); |
a5911867 |
579 | $priv{$_}{16} = "STATE" for ("padav", "padhv", "padsv"); |
d4797c1d |
580 | @{$priv{"entersub"}}{16,32,64} = ("DBG","TARG","NOMOD"); |
c99ca59a |
581 | @{$priv{$_}}{4,8,128} = ("INARGS","AMPER","NO()") for ("entersub", "rv2cv"); |
582 | $priv{"gv"}{32} = "EARLYCV"; |
583 | $priv{"aelem"}{16} = $priv{"helem"}{16} = "LVDEFER"; |
241416b8 |
584 | $priv{$_}{16} = "OURINTR" for ("gvsv", "rv2sv", "rv2av", "rv2hv", "r2gv", |
585 | "enteriter"); |
c99ca59a |
586 | $priv{$_}{16} = "TARGMY" |
587 | for (map(($_,"s$_"),"chop", "chomp"), |
588 | map(($_,"i_$_"), "postinc", "postdec", "multiply", "divide", "modulo", |
589 | "add", "subtract", "negate"), "pow", "concat", "stringify", |
590 | "left_shift", "right_shift", "bit_and", "bit_xor", "bit_or", |
591 | "complement", "atan2", "sin", "cos", "rand", "exp", "log", "sqrt", |
592 | "int", "hex", "oct", "abs", "length", "index", "rindex", "sprintf", |
593 | "ord", "chr", "crypt", "quotemeta", "join", "push", "unshift", "flock", |
594 | "chdir", "chown", "chroot", "unlink", "chmod", "utime", "rename", |
595 | "link", "symlink", "mkdir", "rmdir", "wait", "waitpid", "system", |
596 | "exec", "kill", "getppid", "getpgrp", "setpgrp", "getpriority", |
597 | "setpriority", "time", "sleep"); |
ef3e5ea9 |
598 | $priv{$_}{4} = "REVERSED" for ("enteriter", "iter"); |
d4797c1d |
599 | @{$priv{"const"}}{4,8,16,32,64,128} = ("SHORT","STRICT","ENTERED",'$[',"BARE","WARN"); |
c99ca59a |
600 | $priv{"flip"}{64} = $priv{"flop"}{64} = "LINENUM"; |
601 | $priv{"list"}{64} = "GUESSED"; |
602 | $priv{"delete"}{64} = "SLICE"; |
603 | $priv{"exists"}{64} = "SUB"; |
7b9ef140 |
604 | @{$priv{"sort"}}{1,2,4,8,16,32,64} = ("NUM", "INT", "REV", "INPLACE","DESC","QSORT","STABLE"); |
c99ca59a |
605 | $priv{"threadsv"}{64} = "SVREFd"; |
c27ea44e |
606 | @{$priv{$_}}{16,32,64,128} = ("INBIN","INCR","OUTBIN","OUTCR") |
607 | for ("open", "backtick"); |
c99ca59a |
608 | $priv{"exit"}{128} = "VMS"; |
feaeca78 |
609 | $priv{$_}{2} = "FTACCESS" |
610 | for ("ftrread", "ftrwrite", "ftrexec", "fteread", "ftewrite", "fteexec"); |
7b9ef140 |
611 | $priv{"entereval"}{2} = "HAS_HH"; |
32454ac8 |
612 | if ($] >= 5.009) { |
613 | # Stacked filetests are post 5.8.x |
614 | $priv{$_}{4} = "FTSTACKED" |
615 | for ("ftrread", "ftrwrite", "ftrexec", "fteread", "ftewrite", "fteexec", |
616 | "ftis", "fteowned", "ftrowned", "ftzero", "ftsize", "ftmtime", |
617 | "ftatime", "ftctime", "ftsock", "ftchr", "ftblk", "ftfile", "ftdir", |
618 | "ftpipe", "ftlink", "ftsuid", "ftsgid", "ftsvtx", "fttty", "fttext", |
619 | "ftbinary"); |
620 | # Lexical $_ is post 5.8.x |
621 | $priv{$_}{2} = "GREPLEX" |
622 | for ("mapwhile", "mapstart", "grepwhile", "grepstart"); |
623 | } |
c99ca59a |
624 | |
d5ec2987 |
625 | our %hints; # used to display each COP's op_hints values |
626 | |
627 | # strict refs, subs, vars |
628 | @hints{2,512,1024} = ('$', '&', '*'); |
629 | # integers, locale, bytes, arybase |
630 | @hints{1,4,8,16,32} = ('i', 'l', 'b', '['); |
8b850bd5 |
631 | # block scope, localise %^H, $^OPEN (in), $^OPEN (out) |
632 | @hints{256,131072,262144,524288} = ('{','%','<','>'); |
d5ec2987 |
633 | # overload new integer, float, binary, string, re |
634 | @hints{4096,8192,16384,32768,65536} = ('I', 'F', 'B', 'S', 'R'); |
635 | # taint and eval |
636 | @hints{1048576,2097152} = ('T', 'E'); |
637 | # filetest access, UTF-8, assertions, assertions seen |
638 | @hints{4194304,8388608,16777216,33554432} = ('X', 'U', 'A', 'a'); |
639 | |
640 | sub _flags { |
641 | my($hash, $x) = @_; |
c99ca59a |
642 | my @s; |
d5ec2987 |
643 | for my $flag (sort {$b <=> $a} keys %$hash) { |
644 | if ($hash->{$flag} and $x & $flag and $x >= $flag) { |
c99ca59a |
645 | $x -= $flag; |
d5ec2987 |
646 | push @s, $hash->{$flag}; |
c99ca59a |
647 | } |
648 | } |
649 | push @s, $x if $x; |
650 | return join(",", @s); |
651 | } |
652 | |
d5ec2987 |
653 | sub private_flags { |
654 | my($name, $x) = @_; |
655 | _flags($priv{$name}, $x); |
656 | } |
657 | |
658 | sub hints_flags { |
659 | my($x) = @_; |
660 | _flags(\%hints, $x); |
661 | } |
662 | |
c27ea44e |
663 | sub concise_sv { |
2db5ca0a |
664 | my($sv, $hr, $preferpv) = @_; |
c27ea44e |
665 | $hr->{svclass} = class($sv); |
31b49ad4 |
666 | $hr->{svclass} = "UV" |
667 | if $hr->{svclass} eq "IV" and $sv->FLAGS & SVf_IVisUV; |
5b493bdf |
668 | Carp::cluck("bad concise_sv: $sv") unless $sv and $$sv; |
c27ea44e |
669 | $hr->{svaddr} = sprintf("%#x", $$sv); |
670 | if ($hr->{svclass} eq "GV") { |
671 | my $gv = $sv; |
672 | my $stash = $gv->STASH->NAME; |
673 | if ($stash eq "main") { |
674 | $stash = ""; |
675 | } else { |
676 | $stash = $stash . "::"; |
677 | } |
678 | $hr->{svval} = "*$stash" . $gv->SAFENAME; |
679 | return "*$stash" . $gv->SAFENAME; |
680 | } else { |
681 | while (class($sv) eq "RV") { |
682 | $hr->{svval} .= "\\"; |
683 | $sv = $sv->RV; |
684 | } |
685 | if (class($sv) eq "SPECIAL") { |
40b5b14f |
686 | $hr->{svval} .= ["Null", "sv_undef", "sv_yes", "sv_no"]->[$$sv]; |
2db5ca0a |
687 | } elsif ($preferpv && $sv->FLAGS & SVf_POK) { |
688 | $hr->{svval} .= cstring($sv->PV); |
c27ea44e |
689 | } elsif ($sv->FLAGS & SVf_NOK) { |
40b5b14f |
690 | $hr->{svval} .= $sv->NV; |
c27ea44e |
691 | } elsif ($sv->FLAGS & SVf_IOK) { |
31b49ad4 |
692 | $hr->{svval} .= $sv->int_value; |
c27ea44e |
693 | } elsif ($sv->FLAGS & SVf_POK) { |
40b5b14f |
694 | $hr->{svval} .= cstring($sv->PV); |
31b49ad4 |
695 | } elsif (class($sv) eq "HV") { |
696 | $hr->{svval} .= 'HASH'; |
c27ea44e |
697 | } |
cc02ea56 |
698 | |
699 | $hr->{svval} = 'undef' unless defined $hr->{svval}; |
700 | my $out = $hr->{svclass}; |
701 | return $out .= " $hr->{svval}" ; |
c27ea44e |
702 | } |
703 | } |
704 | |
c99ca59a |
705 | sub concise_op { |
706 | my ($op, $level, $format) = @_; |
707 | my %h; |
708 | $h{exname} = $h{name} = $op->name; |
709 | $h{NAME} = uc $h{name}; |
710 | $h{class} = class($op); |
711 | $h{extarg} = $h{targ} = $op->targ; |
712 | $h{extarg} = "" unless $h{extarg}; |
713 | if ($h{name} eq "null" and $h{targ}) { |
8ec8fbef |
714 | # targ holds the old type |
c99ca59a |
715 | $h{exname} = "ex-" . substr(ppname($h{targ}), 3); |
716 | $h{extarg} = ""; |
8ec8fbef |
717 | } elsif ($op->name =~ /^leave(sub(lv)?|write)?$/) { |
718 | # targ potentially holds a reference count |
719 | if ($op->private & 64) { |
720 | my $refs = "ref" . ($h{targ} != 1 ? "s" : ""); |
721 | $h{targarglife} = $h{targarg} = "$h{targ} $refs"; |
722 | } |
c99ca59a |
723 | } elsif ($h{targ}) { |
724 | my $padname = (($curcv->PADLIST->ARRAY)[0]->ARRAY)[$h{targ}]; |
725 | if (defined $padname and class($padname) ne "SPECIAL") { |
0b40bd6d |
726 | $h{targarg} = $padname->PVX; |
127212b2 |
727 | if ($padname->FLAGS & SVf_FAKE) { |
4ac6efe6 |
728 | if ($] < 5.009) { |
729 | $h{targarglife} = "$h{targarg}:FAKE"; |
730 | } else { |
731 | # These changes relate to the jumbo closure fix. |
732 | # See changes 19939 and 20005 |
733 | my $fake = ''; |
6c5e080d |
734 | $fake .= 'a' |
735 | if $padname->PARENT_FAKELEX_FLAGS & PAD_FAKELEX_ANON; |
736 | $fake .= 'm' |
737 | if $padname->PARENT_FAKELEX_FLAGS & PAD_FAKELEX_MULTI; |
809abb02 |
738 | $fake .= ':' . $padname->PARENT_PAD_INDEX |
739 | if $curcv->CvFLAGS & CVf_ANON; |
4ac6efe6 |
740 | $h{targarglife} = "$h{targarg}:FAKE:$fake"; |
741 | } |
127212b2 |
742 | } |
743 | else { |
809abb02 |
744 | my $intro = $padname->COP_SEQ_RANGE_LOW - $cop_seq_base; |
745 | my $finish = int($padname->COP_SEQ_RANGE_HIGH) - $cop_seq_base; |
127212b2 |
746 | $finish = "end" if $finish == 999999999 - $cop_seq_base; |
747 | $h{targarglife} = "$h{targarg}:$intro,$finish"; |
748 | } |
c99ca59a |
749 | } else { |
750 | $h{targarglife} = $h{targarg} = "t" . $h{targ}; |
751 | } |
752 | } |
753 | $h{arg} = ""; |
754 | $h{svclass} = $h{svaddr} = $h{svval} = ""; |
755 | if ($h{class} eq "PMOP") { |
756 | my $precomp = $op->precomp; |
7a9b44b9 |
757 | if (defined $precomp) { |
c27ea44e |
758 | $precomp = cstring($precomp); # Escape literal control sequences |
759 | $precomp = "/$precomp/"; |
760 | } else { |
761 | $precomp = ""; |
7a9b44b9 |
762 | } |
b2a3cfdd |
763 | my $pmreplroot = $op->pmreplroot; |
34a48b4b |
764 | my $pmreplstart; |
c6e79e55 |
765 | if (ref($pmreplroot) eq "B::GV") { |
b2a3cfdd |
766 | # with C<@stash_array = split(/pat/, str);>, |
c6e79e55 |
767 | # *stash_array is stored in /pat/'s pmreplroot. |
b2a3cfdd |
768 | $h{arg} = "($precomp => \@" . $pmreplroot->NAME . ")"; |
c6e79e55 |
769 | } elsif (!ref($pmreplroot) and $pmreplroot) { |
770 | # same as the last case, except the value is actually a |
771 | # pad offset for where the GV is kept (this happens under |
772 | # ithreads) |
773 | my $gv = (($curcv->PADLIST->ARRAY)[1]->ARRAY)[$pmreplroot]; |
774 | $h{arg} = "($precomp => \@" . $gv->NAME . ")"; |
b2a3cfdd |
775 | } elsif ($ {$op->pmreplstart}) { |
c99ca59a |
776 | undef $lastnext; |
777 | $pmreplstart = "replstart->" . seq($op->pmreplstart); |
778 | $h{arg} = "(" . join(" ", $precomp, $pmreplstart) . ")"; |
779 | } else { |
780 | $h{arg} = "($precomp)"; |
781 | } |
782 | } elsif ($h{class} eq "PVOP" and $h{name} ne "trans") { |
783 | $h{arg} = '("' . $op->pv . '")'; |
784 | $h{svval} = '"' . $op->pv . '"'; |
785 | } elsif ($h{class} eq "COP") { |
786 | my $label = $op->label; |
c3caa09d |
787 | $h{coplabel} = $label; |
c99ca59a |
788 | $label = $label ? "$label: " : ""; |
789 | my $loc = $op->file; |
790 | $loc =~ s[.*/][]; |
791 | $loc .= ":" . $op->line; |
792 | my($stash, $cseq) = ($op->stash->NAME, $op->cop_seq - $cop_seq_base); |
793 | my $arybase = $op->arybase; |
794 | $arybase = $arybase ? ' $[=' . $arybase : ""; |
795 | $h{arg} = "($label$stash $cseq $loc$arybase)"; |
796 | } elsif ($h{class} eq "LOOP") { |
797 | $h{arg} = "(next->" . seq($op->nextop) . " last->" . seq($op->lastop) |
798 | . " redo->" . seq($op->redoop) . ")"; |
799 | } elsif ($h{class} eq "LOGOP") { |
800 | undef $lastnext; |
801 | $h{arg} = "(other->" . seq($op->other) . ")"; |
5b493bdf |
802 | } |
803 | elsif ($h{class} eq "SVOP" or $h{class} eq "PADOP") { |
6a077020 |
804 | unless ($h{name} eq 'aelemfast' and $op->flags & OPf_SPECIAL) { |
5b493bdf |
805 | my $idx = ($h{class} eq "SVOP") ? $op->targ : $op->padix; |
2db5ca0a |
806 | my $preferpv = $h{name} eq "method_named"; |
5b493bdf |
807 | if ($h{class} eq "PADOP" or !${$op->sv}) { |
808 | my $sv = (($curcv->PADLIST->ARRAY)[1]->ARRAY)[$idx]; |
2db5ca0a |
809 | $h{arg} = "[" . concise_sv($sv, \%h, $preferpv) . "]"; |
6a077020 |
810 | $h{targarglife} = $h{targarg} = ""; |
811 | } else { |
2db5ca0a |
812 | $h{arg} = "(" . concise_sv($op->sv, \%h, $preferpv) . ")"; |
6a077020 |
813 | } |
c99ca59a |
814 | } |
815 | } |
816 | $h{seq} = $h{hyphseq} = seq($op); |
817 | $h{seq} = "" if $h{seq} eq "-"; |
7252851f |
818 | if ($] > 5.009) { |
819 | $h{opt} = $op->opt; |
820 | $h{static} = $op->static; |
821 | $h{label} = $labels{$$op}; |
822 | } else { |
823 | $h{seqnum} = $op->seq; |
824 | $h{label} = $labels{$op->seq}; |
825 | } |
c99ca59a |
826 | $h{next} = $op->next; |
827 | $h{next} = (class($h{next}) eq "NULL") ? "(end)" : seq($h{next}); |
828 | $h{nextaddr} = sprintf("%#x", $ {$op->next}); |
829 | $h{sibaddr} = sprintf("%#x", $ {$op->sibling}); |
830 | $h{firstaddr} = sprintf("%#x", $ {$op->first}) if $op->can("first"); |
831 | $h{lastaddr} = sprintf("%#x", $ {$op->last}) if $op->can("last"); |
832 | |
833 | $h{classsym} = $opclass{$h{class}}; |
834 | $h{flagval} = $op->flags; |
835 | $h{flags} = op_flags($op->flags); |
836 | $h{privval} = $op->private; |
837 | $h{private} = private_flags($h{name}, $op->private); |
d5ec2987 |
838 | if ($op->can("hints")) { |
839 | $h{hintsval} = $op->hints; |
840 | $h{hints} = hints_flags($h{hintsval}); |
841 | } else { |
842 | $h{hintsval} = $h{hints} = ''; |
843 | } |
c99ca59a |
844 | $h{addr} = sprintf("%#x", $$op); |
c99ca59a |
845 | $h{typenum} = $op->type; |
846 | $h{noise} = $linenoise[$op->type]; |
f95e3c3c |
847 | |
cc02ea56 |
848 | return fmt_line(\%h, $op, $format, $level); |
c99ca59a |
849 | } |
850 | |
851 | sub B::OP::concise { |
852 | my($op, $level) = @_; |
853 | if ($order eq "exec" and $lastnext and $$lastnext != $$op) { |
724aa791 |
854 | # insert a 'goto' line |
cc02ea56 |
855 | my $synth = {"seq" => seq($lastnext), "class" => class($lastnext), |
856 | "addr" => sprintf("%#x", $$lastnext), |
857 | "goto" => seq($lastnext), # simplify goto '-' removal |
858 | }; |
859 | print $walkHandle fmt_line($synth, $op, $gotofmt, $level+1); |
c99ca59a |
860 | } |
861 | $lastnext = $op->next; |
f95e3c3c |
862 | print $walkHandle concise_op($op, $level, $format); |
c99ca59a |
863 | } |
864 | |
31b49ad4 |
865 | # B::OP::terse (see Terse.pm) now just calls this |
866 | sub b_terse { |
867 | my($op, $level) = @_; |
868 | |
869 | # This isn't necessarily right, but there's no easy way to get |
870 | # from an OP to the right CV. This is a limitation of the |
871 | # ->terse() interface style, and there isn't much to do about |
872 | # it. In particular, we can die in concise_op if the main pad |
873 | # isn't long enough, or has the wrong kind of entries, compared to |
874 | # the pad a sub was compiled with. The fix for that would be to |
875 | # make a backwards compatible "terse" format that never even |
876 | # looked at the pad, just like the old B::Terse. I don't think |
877 | # that's worth the effort, though. |
878 | $curcv = main_cv unless $curcv; |
879 | |
880 | if ($order eq "exec" and $lastnext and $$lastnext != $$op) { |
724aa791 |
881 | # insert a 'goto' |
31b49ad4 |
882 | my $h = {"seq" => seq($lastnext), "class" => class($lastnext), |
883 | "addr" => sprintf("%#x", $$lastnext)}; |
cc02ea56 |
884 | print # $walkHandle |
885 | fmt_line($h, $op, $style{"terse"}[1], $level+1); |
31b49ad4 |
886 | } |
887 | $lastnext = $op->next; |
cc02ea56 |
888 | print # $walkHandle |
889 | concise_op($op, $level, $style{"terse"}[0]); |
31b49ad4 |
890 | } |
891 | |
c99ca59a |
892 | sub tree { |
893 | my $op = shift; |
894 | my $level = shift; |
895 | my $style = $tree_decorations[$tree_style]; |
896 | my($space, $single, $kids, $kid, $nokid, $last, $lead, $size) = @$style; |
897 | my $name = concise_op($op, $level, $treefmt); |
898 | if (not $op->flags & OPf_KIDS) { |
899 | return $name . "\n"; |
900 | } |
901 | my @lines; |
902 | for (my $kid = $op->first; $$kid; $kid = $kid->sibling) { |
903 | push @lines, tree($kid, $level+1); |
904 | } |
905 | my $i; |
906 | for ($i = $#lines; substr($lines[$i], 0, 1) eq " "; $i--) { |
907 | $lines[$i] = $space . $lines[$i]; |
908 | } |
909 | if ($i > 0) { |
910 | $lines[$i] = $last . $lines[$i]; |
911 | while ($i-- > 1) { |
912 | if (substr($lines[$i], 0, 1) eq " ") { |
913 | $lines[$i] = $nokid . $lines[$i]; |
914 | } else { |
f95e3c3c |
915 | $lines[$i] = $kid . $lines[$i]; |
c99ca59a |
916 | } |
917 | } |
918 | $lines[$i] = $kids . $lines[$i]; |
919 | } else { |
920 | $lines[0] = $single . $lines[0]; |
921 | } |
922 | return("$name$lead" . shift @lines, |
923 | map(" " x (length($name)+$size) . $_, @lines)); |
924 | } |
925 | |
213a1a26 |
926 | # *** Warning: fragile kludge ahead *** |
927 | # Because the B::* modules run in the same interpreter as the code |
2814eb74 |
928 | # they're compiling, their presence tends to distort the view we have of |
929 | # the code we're looking at. In particular, perl gives sequence numbers |
930 | # to COPs. If the program we're looking at were run on its own, this |
931 | # would start at 1. Because all of B::Concise and all the modules it |
932 | # uses are compiled first, though, by the time we get to the user's |
933 | # program the sequence number is already pretty high, which could be |
934 | # distracting if you're trying to tell OPs apart. Therefore we'd like to |
935 | # subtract an offset from all the sequence numbers we display, to |
936 | # restore the simpler view of the world. The trick is to know what that |
937 | # offset will be, when we're still compiling B::Concise! If we |
213a1a26 |
938 | # hardcoded a value, it would have to change every time B::Concise or |
2814eb74 |
939 | # other modules we use do. To help a little, what we do here is compile |
940 | # a little code at the end of the module, and compute the base sequence |
941 | # number for the user's program as being a small offset later, so all we |
942 | # have to worry about are changes in the offset. |
7252851f |
943 | |
944 | # [For 5.8.x and earlier perl is generating sequence numbers for all ops, |
945 | # and using them to reference labels] |
946 | |
947 | |
213a1a26 |
948 | # When you say "perl -MO=Concise -e '$a'", the output should look like: |
949 | |
950 | # 4 <@> leave[t1] vKP/REFC ->(end) |
951 | # 1 <0> enter ->2 |
952 | #^ smallest OP sequence number should be 1 |
953 | # 2 <;> nextstate(main 1 -e:1) v ->3 |
954 | # ^ smallest COP sequence number should be 1 |
955 | # - <1> ex-rv2sv vK/1 ->4 |
956 | # 3 <$> gvsv(*a) s ->4 |
957 | |
c27ea44e |
958 | # If the second of the marked numbers there isn't 1, it means you need |
959 | # to update the corresponding magic number in the next line. |
960 | # Remember, this needs to stay the last things in the module. |
e69a2255 |
961 | |
c27ea44e |
962 | # Why is this different for MacOS? Does it matter? |
8ec8fbef |
963 | my $cop_seq_mnum = $^O eq 'MacOS' ? 12 : 11; |
e69a2255 |
964 | $cop_seq_base = svref_2object(eval 'sub{0;}')->START->cop_seq + $cop_seq_mnum; |
c99ca59a |
965 | |
966 | 1; |
967 | |
968 | __END__ |
969 | |
970 | =head1 NAME |
971 | |
972 | B::Concise - Walk Perl syntax tree, printing concise info about ops |
973 | |
974 | =head1 SYNOPSIS |
975 | |
976 | perl -MO=Concise[,OPTIONS] foo.pl |
977 | |
78ad9108 |
978 | use B::Concise qw(set_style add_callback); |
979 | |
c99ca59a |
980 | =head1 DESCRIPTION |
981 | |
982 | This compiler backend prints the internal OPs of a Perl program's syntax |
983 | tree in one of several space-efficient text formats suitable for debugging |
984 | the inner workings of perl or other compiler backends. It can print OPs in |
985 | the order they appear in the OP tree, in the order they will execute, or |
986 | in a text approximation to their tree structure, and the format of the |
3c4b39be |
987 | information displayed is customizable. Its function is similar to that of |
c99ca59a |
988 | perl's B<-Dx> debugging flag or the B<B::Terse> module, but it is more |
989 | sophisticated and flexible. |
990 | |
f8a679e6 |
991 | =head1 EXAMPLE |
992 | |
f9f861ec |
993 | Here's two outputs (or 'renderings'), using the -exec and -basic |
994 | (i.e. default) formatting conventions on the same code snippet. |
19e169bf |
995 | |
996 | % perl -MO=Concise,-exec -e '$a = $b + 42' |
997 | 1 <0> enter |
998 | 2 <;> nextstate(main 1 -e:1) v |
999 | 3 <#> gvsv[*b] s |
1000 | 4 <$> const[IV 42] s |
1001 | * 5 <2> add[t3] sK/2 |
1002 | 6 <#> gvsv[*a] s |
1003 | 7 <2> sassign vKS/2 |
1004 | 8 <@> leave[1 ref] vKP/REFC |
1005 | |
f9f861ec |
1006 | In this -exec rendering, each opcode is executed in the order shown. |
1007 | The add opcode, marked with '*', is discussed in more detail. |
19e169bf |
1008 | |
1009 | The 1st column is the op's sequence number, starting at 1, and is |
f9f861ec |
1010 | displayed in base 36 by default. Here they're purely linear; the |
1011 | sequences are very helpful when looking at code with loops and |
1012 | branches. |
19e169bf |
1013 | |
1014 | The symbol between angle brackets indicates the op's type, for |
1015 | example; <2> is a BINOP, <@> a LISTOP, and <#> is a PADOP, which is |
1016 | used in threaded perls. (see L</"OP class abbreviations">). |
1017 | |
f9f861ec |
1018 | The opname, as in B<'add[t1]'>, may be followed by op-specific |
19e169bf |
1019 | information in parentheses or brackets (ex B<'[t1]'>). |
1020 | |
f9f861ec |
1021 | The op-flags (ex B<'sK/2'>) are described in (L</"OP flags |
19e169bf |
1022 | abbreviations">). |
f8a679e6 |
1023 | |
1024 | % perl -MO=Concise -e '$a = $b + 42' |
8ec8fbef |
1025 | 8 <@> leave[1 ref] vKP/REFC ->(end) |
f8a679e6 |
1026 | 1 <0> enter ->2 |
1027 | 2 <;> nextstate(main 1 -e:1) v ->3 |
1028 | 7 <2> sassign vKS/2 ->8 |
19e169bf |
1029 | * 5 <2> add[t1] sK/2 ->6 |
f8a679e6 |
1030 | - <1> ex-rv2sv sK/1 ->4 |
1031 | 3 <$> gvsv(*b) s ->4 |
1032 | 4 <$> const(IV 42) s ->5 |
1033 | - <1> ex-rv2sv sKRM*/1 ->7 |
1034 | 6 <$> gvsv(*a) s ->7 |
1035 | |
19e169bf |
1036 | The default rendering is top-down, so they're not in execution order. |
1037 | This form reflects the way the stack is used to parse and evaluate |
1038 | expressions; the add operates on the two terms below it in the tree. |
f8a679e6 |
1039 | |
19e169bf |
1040 | Nullops appear as C<ex-opname>, where I<opname> is an op that has been |
1041 | optimized away by perl. They're displayed with a sequence-number of |
1042 | '-', because they are not executed (they don't appear in previous |
1043 | example), they're printed here because they reflect the parse. |
f8a679e6 |
1044 | |
19e169bf |
1045 | The arrow points to the sequence number of the next op; they're not |
1046 | displayed in -exec mode, for obvious reasons. |
f8a679e6 |
1047 | |
19e169bf |
1048 | Note that because this rendering was done on a non-threaded perl, the |
1049 | PADOPs in the previous examples are now SVOPs, and some (but not all) |
1050 | of the square brackets have been replaced by round ones. This is a |
1051 | subtle feature to provide some visual distinction between renderings |
1052 | on threaded and un-threaded perls. |
f8a679e6 |
1053 | |
f8a679e6 |
1054 | |
c99ca59a |
1055 | =head1 OPTIONS |
1056 | |
1057 | Arguments that don't start with a hyphen are taken to be the names of |
8ec8fbef |
1058 | subroutines to print the OPs of; if no such functions are specified, |
1059 | the main body of the program (outside any subroutines, and not |
19e169bf |
1060 | including use'd or require'd files) is rendered. Passing C<BEGIN>, |
676456c2 |
1061 | C<UNITCHECK>, C<CHECK>, C<INIT>, or C<END> will cause all of the |
1062 | corresponding special blocks to be printed. |
c99ca59a |
1063 | |
724aa791 |
1064 | Options affect how things are rendered (ie printed). They're presented |
1065 | here by their visual effect, 1st being strongest. They're grouped |
1066 | according to how they interrelate; within each group the options are |
1067 | mutually exclusive (unless otherwise stated). |
1068 | |
1069 | =head2 Options for Opcode Ordering |
1070 | |
1071 | These options control the 'vertical display' of opcodes. The display |
1072 | 'order' is also called 'mode' elsewhere in this document. |
1073 | |
c99ca59a |
1074 | =over 4 |
1075 | |
1076 | =item B<-basic> |
1077 | |
1078 | Print OPs in the order they appear in the OP tree (a preorder |
1079 | traversal, starting at the root). The indentation of each OP shows its |
19e169bf |
1080 | level in the tree, and the '->' at the end of the line indicates the |
1081 | next opcode in execution order. This mode is the default, so the flag |
1082 | is included simply for completeness. |
c99ca59a |
1083 | |
1084 | =item B<-exec> |
1085 | |
1086 | Print OPs in the order they would normally execute (for the majority |
1087 | of constructs this is a postorder traversal of the tree, ending at the |
1088 | root). In most cases the OP that usually follows a given OP will |
1089 | appear directly below it; alternate paths are shown by indentation. In |
1090 | cases like loops when control jumps out of a linear path, a 'goto' |
1091 | line is generated. |
1092 | |
1093 | =item B<-tree> |
1094 | |
1095 | Print OPs in a text approximation of a tree, with the root of the tree |
1096 | at the left and 'left-to-right' order of children transformed into |
1097 | 'top-to-bottom'. Because this mode grows both to the right and down, |
1098 | it isn't suitable for large programs (unless you have a very wide |
1099 | terminal). |
1100 | |
724aa791 |
1101 | =back |
1102 | |
1103 | =head2 Options for Line-Style |
1104 | |
1105 | These options select the line-style (or just style) used to render |
1106 | each opcode, and dictates what info is actually printed into each line. |
1107 | |
1108 | =over 4 |
1109 | |
1110 | =item B<-concise> |
1111 | |
1112 | Use the author's favorite set of formatting conventions. This is the |
1113 | default, of course. |
1114 | |
1115 | =item B<-terse> |
1116 | |
1117 | Use formatting conventions that emulate the output of B<B::Terse>. The |
1118 | basic mode is almost indistinguishable from the real B<B::Terse>, and the |
1119 | exec mode looks very similar, but is in a more logical order and lacks |
1120 | curly brackets. B<B::Terse> doesn't have a tree mode, so the tree mode |
1121 | is only vaguely reminiscent of B<B::Terse>. |
1122 | |
1123 | =item B<-linenoise> |
1124 | |
1125 | Use formatting conventions in which the name of each OP, rather than being |
1126 | written out in full, is represented by a one- or two-character abbreviation. |
1127 | This is mainly a joke. |
1128 | |
1129 | =item B<-debug> |
1130 | |
1131 | Use formatting conventions reminiscent of B<B::Debug>; these aren't |
1132 | very concise at all. |
1133 | |
1134 | =item B<-env> |
1135 | |
1136 | Use formatting conventions read from the environment variables |
1137 | C<B_CONCISE_FORMAT>, C<B_CONCISE_GOTO_FORMAT>, and C<B_CONCISE_TREE_FORMAT>. |
1138 | |
1139 | =back |
1140 | |
1141 | =head2 Options for tree-specific formatting |
1142 | |
1143 | =over 4 |
1144 | |
c99ca59a |
1145 | =item B<-compact> |
1146 | |
1147 | Use a tree format in which the minimum amount of space is used for the |
1148 | lines connecting nodes (one character in most cases). This squeezes out |
1149 | a few precious columns of screen real estate. |
1150 | |
1151 | =item B<-loose> |
1152 | |
1153 | Use a tree format that uses longer edges to separate OP nodes. This format |
1154 | tends to look better than the compact one, especially in ASCII, and is |
1155 | the default. |
1156 | |
1157 | =item B<-vt> |
1158 | |
1159 | Use tree connecting characters drawn from the VT100 line-drawing set. |
1160 | This looks better if your terminal supports it. |
1161 | |
1162 | =item B<-ascii> |
1163 | |
1164 | Draw the tree with standard ASCII characters like C<+> and C<|>. These don't |
1165 | look as clean as the VT100 characters, but they'll work with almost any |
1166 | terminal (or the horizontal scrolling mode of less(1)) and are suitable |
1167 | for text documentation or email. This is the default. |
1168 | |
724aa791 |
1169 | =back |
c99ca59a |
1170 | |
724aa791 |
1171 | These are pairwise exclusive, i.e. compact or loose, vt or ascii. |
1172 | |
1173 | =head2 Options controlling sequence numbering |
1174 | |
1175 | =over 4 |
c99ca59a |
1176 | |
1177 | =item B<-base>I<n> |
1178 | |
1179 | Print OP sequence numbers in base I<n>. If I<n> is greater than 10, the |
1180 | digit for 11 will be 'a', and so on. If I<n> is greater than 36, the digit |
1181 | for 37 will be 'A', and so on until 62. Values greater than 62 are not |
1182 | currently supported. The default is 36. |
1183 | |
1184 | =item B<-bigendian> |
1185 | |
1186 | Print sequence numbers with the most significant digit first. This is the |
1187 | usual convention for Arabic numerals, and the default. |
1188 | |
1189 | =item B<-littleendian> |
1190 | |
724aa791 |
1191 | Print seqence numbers with the least significant digit first. This is |
1192 | obviously mutually exclusive with bigendian. |
c99ca59a |
1193 | |
724aa791 |
1194 | =back |
c99ca59a |
1195 | |
724aa791 |
1196 | =head2 Other options |
c99ca59a |
1197 | |
cc02ea56 |
1198 | These are pairwise exclusive. |
1199 | |
724aa791 |
1200 | =over 4 |
c99ca59a |
1201 | |
724aa791 |
1202 | =item B<-main> |
c99ca59a |
1203 | |
724aa791 |
1204 | Include the main program in the output, even if subroutines were also |
cc02ea56 |
1205 | specified. This rendering is normally suppressed when a subroutine |
1206 | name or reference is given. |
1207 | |
1208 | =item B<-nomain> |
1209 | |
1210 | This restores the default behavior after you've changed it with '-main' |
1211 | (it's not normally needed). If no subroutine name/ref is given, main is |
1212 | rendered, regardless of this flag. |
1213 | |
1214 | =item B<-nobanner> |
1215 | |
1216 | Renderings usually include a banner line identifying the function name |
1217 | or stringified subref. This suppresses the printing of the banner. |
1218 | |
1219 | TBC: Remove the stringified coderef; while it provides a 'cookie' for |
1220 | each function rendered, the cookies used should be 1,2,3.. not a |
1221 | random hex-address. It also complicates string comparison of two |
1222 | different trees. |
c99ca59a |
1223 | |
724aa791 |
1224 | =item B<-banner> |
c99ca59a |
1225 | |
cc02ea56 |
1226 | restores default banner behavior. |
1227 | |
1228 | =item B<-banneris> => subref |
1229 | |
1230 | TBC: a hookpoint (and an option to set it) for a user-supplied |
1231 | function to produce a banner appropriate for users needs. It's not |
1232 | ideal, because the rendering-state variables, which are a natural |
1233 | candidate for use in concise.t, are unavailable to the user. |
c99ca59a |
1234 | |
724aa791 |
1235 | =back |
c99ca59a |
1236 | |
724aa791 |
1237 | =head2 Option Stickiness |
c99ca59a |
1238 | |
724aa791 |
1239 | If you invoke Concise more than once in a program, you should know that |
1240 | the options are 'sticky'. This means that the options you provide in |
1241 | the first call will be remembered for the 2nd call, unless you |
1242 | re-specify or change them. |
c99ca59a |
1243 | |
cc02ea56 |
1244 | =head1 ABBREVIATIONS |
1245 | |
1246 | The concise style uses symbols to convey maximum info with minimal |
1247 | clutter (like hex addresses). With just a little practice, you can |
1248 | start to see the flowers, not just the branches, in the trees. |
1249 | |
1250 | =head2 OP class abbreviations |
1251 | |
1252 | These symbols appear before the op-name, and indicate the |
1253 | B:: namespace that represents the ops in your Perl code. |
1254 | |
1255 | 0 OP (aka BASEOP) An OP with no children |
1256 | 1 UNOP An OP with one child |
1257 | 2 BINOP An OP with two children |
1258 | | LOGOP A control branch OP |
1259 | @ LISTOP An OP that could have lots of children |
1260 | / PMOP An OP with a regular expression |
1261 | $ SVOP An OP with an SV |
1262 | " PVOP An OP with a string |
1263 | { LOOP An OP that holds pointers for a loop |
1264 | ; COP An OP that marks the start of a statement |
1265 | # PADOP An OP with a GV on the pad |
1266 | |
1267 | =head2 OP flags abbreviations |
1268 | |
19e169bf |
1269 | OP flags are either public or private. The public flags alter the |
1270 | behavior of each opcode in consistent ways, and are represented by 0 |
1271 | or more single characters. |
cc02ea56 |
1272 | |
1273 | v OPf_WANT_VOID Want nothing (void context) |
1274 | s OPf_WANT_SCALAR Want single value (scalar context) |
1275 | l OPf_WANT_LIST Want list of any length (list context) |
19e169bf |
1276 | Want is unknown |
cc02ea56 |
1277 | K OPf_KIDS There is a firstborn child. |
1278 | P OPf_PARENS This operator was parenthesized. |
1279 | (Or block needs explicit scope entry.) |
1280 | R OPf_REF Certified reference. |
1281 | (Return container, not containee). |
1282 | M OPf_MOD Will modify (lvalue). |
1283 | S OPf_STACKED Some arg is arriving on the stack. |
1284 | * OPf_SPECIAL Do something weird for this op (see op.h) |
1285 | |
19e169bf |
1286 | Private flags, if any are set for an opcode, are displayed after a '/' |
1287 | |
1288 | 8 <@> leave[1 ref] vKP/REFC ->(end) |
1289 | 7 <2> sassign vKS/2 ->8 |
1290 | |
1291 | They're opcode specific, and occur less often than the public ones, so |
1292 | they're represented by short mnemonics instead of single-chars; see |
00baac8f |
1293 | F<op.h> for gory details, or try this quick 2-liner: |
19e169bf |
1294 | |
1295 | $> perl -MB::Concise -de 1 |
1296 | DB<1> |x \%B::Concise::priv |
1297 | |
c99ca59a |
1298 | =head1 FORMATTING SPECIFICATIONS |
1299 | |
724aa791 |
1300 | For each line-style ('concise', 'terse', 'linenoise', etc.) there are |
1301 | 3 format-specs which control how OPs are rendered. |
1302 | |
1303 | The first is the 'default' format, which is used in both basic and exec |
1304 | modes to print all opcodes. The 2nd, goto-format, is used in exec |
1305 | mode when branches are encountered. They're not real opcodes, and are |
1306 | inserted to look like a closing curly brace. The tree-format is tree |
1307 | specific. |
1308 | |
cc02ea56 |
1309 | When a line is rendered, the correct format-spec is copied and scanned |
1310 | for the following items; data is substituted in, and other |
1311 | manipulations like basic indenting are done, for each opcode rendered. |
1312 | |
1313 | There are 3 kinds of items that may be populated; special patterns, |
1314 | #vars, and literal text, which is copied verbatim. (Yes, it's a set |
1315 | of s///g steps.) |
1316 | |
1317 | =head2 Special Patterns |
1318 | |
1319 | These items are the primitives used to perform indenting, and to |
1320 | select text from amongst alternatives. |
c99ca59a |
1321 | |
1322 | =over 4 |
1323 | |
1324 | =item B<(x(>I<exec_text>B<;>I<basic_text>B<)x)> |
1325 | |
1326 | Generates I<exec_text> in exec mode, or I<basic_text> in basic mode. |
1327 | |
1328 | =item B<(*(>I<text>B<)*)> |
1329 | |
1330 | Generates one copy of I<text> for each indentation level. |
1331 | |
1332 | =item B<(*(>I<text1>B<;>I<text2>B<)*)> |
1333 | |
1334 | Generates one fewer copies of I<text1> than the indentation level, followed |
1335 | by one copy of I<text2> if the indentation level is more than 0. |
1336 | |
1337 | =item B<(?(>I<text1>B<#>I<var>I<Text2>B<)?)> |
1338 | |
1339 | If the value of I<var> is true (not empty or zero), generates the |
1340 | value of I<var> surrounded by I<text1> and I<Text2>, otherwise |
1341 | nothing. |
1342 | |
cc02ea56 |
1343 | =item B<~> |
1344 | |
1345 | Any number of tildes and surrounding whitespace will be collapsed to |
1346 | a single space. |
1347 | |
1348 | =back |
1349 | |
1350 | =head2 # Variables |
1351 | |
1352 | These #vars represent opcode properties that you may want as part of |
1353 | your rendering. The '#' is intended as a private sigil; a #var's |
1354 | value is interpolated into the style-line, much like "read $this". |
1355 | |
1356 | These vars take 3 forms: |
1357 | |
1358 | =over 4 |
1359 | |
c99ca59a |
1360 | =item B<#>I<var> |
1361 | |
cc02ea56 |
1362 | A property named 'var' is assumed to exist for the opcodes, and is |
1363 | interpolated into the rendering. |
c99ca59a |
1364 | |
1365 | =item B<#>I<var>I<N> |
1366 | |
cc02ea56 |
1367 | Generates the value of I<var>, left justified to fill I<N> spaces. |
1368 | Note that this means while you can have properties 'foo' and 'foo2', |
1369 | you cannot render 'foo2', but you could with 'foo2a'. You would be |
1370 | wise not to rely on this behavior going forward ;-) |
c99ca59a |
1371 | |
cc02ea56 |
1372 | =item B<#>I<Var> |
c99ca59a |
1373 | |
cc02ea56 |
1374 | This ucfirst form of #var generates a tag-value form of itself for |
1375 | display; it converts '#Var' into a 'Var => #var' style, which is then |
1376 | handled as described above. (Imp-note: #Vars cannot be used for |
1377 | conditional-fills, because the => #var transform is done after the check |
1378 | for #Var's value). |
c99ca59a |
1379 | |
1380 | =back |
1381 | |
cc02ea56 |
1382 | The following variables are 'defined' by B::Concise; when they are |
1383 | used in a style, their respective values are plugged into the |
1384 | rendering of each opcode. |
1385 | |
1386 | Only some of these are used by the standard styles, the others are |
1387 | provided for you to delve into optree mechanics, should you wish to |
1388 | add a new style (see L</add_style> below) that uses them. You can |
00baac8f |
1389 | also add new ones using L</add_callback>. |
c99ca59a |
1390 | |
1391 | =over 4 |
1392 | |
1393 | =item B<#addr> |
1394 | |
cc02ea56 |
1395 | The address of the OP, in hexadecimal. |
c99ca59a |
1396 | |
1397 | =item B<#arg> |
1398 | |
1399 | The OP-specific information of the OP (such as the SV for an SVOP, the |
cc02ea56 |
1400 | non-local exit pointers for a LOOP, etc.) enclosed in parentheses. |
c99ca59a |
1401 | |
1402 | =item B<#class> |
1403 | |
1404 | The B-determined class of the OP, in all caps. |
1405 | |
f8a679e6 |
1406 | =item B<#classsym> |
c99ca59a |
1407 | |
1408 | A single symbol abbreviating the class of the OP. |
1409 | |
c3caa09d |
1410 | =item B<#coplabel> |
1411 | |
1412 | The label of the statement or block the OP is the start of, if any. |
1413 | |
c99ca59a |
1414 | =item B<#exname> |
1415 | |
1416 | The name of the OP, or 'ex-foo' if the OP is a null that used to be a foo. |
1417 | |
1418 | =item B<#extarg> |
1419 | |
1420 | The target of the OP, or nothing for a nulled OP. |
1421 | |
1422 | =item B<#firstaddr> |
1423 | |
19e169bf |
1424 | The address of the OP's first child, in hexadecimal. |
c99ca59a |
1425 | |
1426 | =item B<#flags> |
1427 | |
1428 | The OP's flags, abbreviated as a series of symbols. |
1429 | |
1430 | =item B<#flagval> |
1431 | |
1432 | The numeric value of the OP's flags. |
1433 | |
d5ec2987 |
1434 | =item B<#hints> |
1435 | |
1436 | The COP's hint flags, rendered with abbreviated names if possible. An empty |
1437 | string if this is not a COP. |
1438 | |
1439 | =item B<#hintsval> |
1440 | |
1441 | The numeric value of the COP's hint flags, or an empty string if this is not |
1442 | a COP. |
1443 | |
f8a679e6 |
1444 | =item B<#hyphseq> |
c99ca59a |
1445 | |
1446 | The sequence number of the OP, or a hyphen if it doesn't have one. |
1447 | |
1448 | =item B<#label> |
1449 | |
1450 | 'NEXT', 'LAST', or 'REDO' if the OP is a target of one of those in exec |
1451 | mode, or empty otherwise. |
1452 | |
1453 | =item B<#lastaddr> |
1454 | |
19e169bf |
1455 | The address of the OP's last child, in hexadecimal. |
c99ca59a |
1456 | |
1457 | =item B<#name> |
1458 | |
1459 | The OP's name. |
1460 | |
1461 | =item B<#NAME> |
1462 | |
1463 | The OP's name, in all caps. |
1464 | |
1465 | =item B<#next> |
1466 | |
1467 | The sequence number of the OP's next OP. |
1468 | |
1469 | =item B<#nextaddr> |
1470 | |
19e169bf |
1471 | The address of the OP's next OP, in hexadecimal. |
c99ca59a |
1472 | |
1473 | =item B<#noise> |
1474 | |
c27ea44e |
1475 | A one- or two-character abbreviation for the OP's name. |
c99ca59a |
1476 | |
1477 | =item B<#private> |
1478 | |
1479 | The OP's private flags, rendered with abbreviated names if possible. |
1480 | |
1481 | =item B<#privval> |
1482 | |
1483 | The numeric value of the OP's private flags. |
1484 | |
1485 | =item B<#seq> |
1486 | |
2814eb74 |
1487 | The sequence number of the OP. Note that this is a sequence number |
1488 | generated by B::Concise. |
c99ca59a |
1489 | |
7252851f |
1490 | =item B<#seqnum> |
1491 | |
1492 | 5.8.x and earlier only. 5.9 and later do not provide this. |
1493 | |
1494 | The real sequence number of the OP, as a regular number and not adjusted |
1495 | to be relative to the start of the real program. (This will generally be |
1496 | a fairly large number because all of B<B::Concise> is compiled before |
1497 | your program is). |
1498 | |
2814eb74 |
1499 | =item B<#opt> |
c99ca59a |
1500 | |
2814eb74 |
1501 | Whether or not the op has been optimised by the peephole optimiser. |
1502 | |
7252851f |
1503 | Only available in 5.9 and later. |
1504 | |
2814eb74 |
1505 | =item B<#static> |
1506 | |
1507 | Whether or not the op is statically defined. This flag is used by the |
1508 | B::C compiler backend and indicates that the op should not be freed. |
c99ca59a |
1509 | |
7252851f |
1510 | Only available in 5.9 and later. |
1511 | |
c99ca59a |
1512 | =item B<#sibaddr> |
1513 | |
19e169bf |
1514 | The address of the OP's next youngest sibling, in hexadecimal. |
c99ca59a |
1515 | |
1516 | =item B<#svaddr> |
1517 | |
19e169bf |
1518 | The address of the OP's SV, if it has an SV, in hexadecimal. |
c99ca59a |
1519 | |
1520 | =item B<#svclass> |
1521 | |
1522 | The class of the OP's SV, if it has one, in all caps (e.g., 'IV'). |
1523 | |
1524 | =item B<#svval> |
1525 | |
1526 | The value of the OP's SV, if it has one, in a short human-readable format. |
1527 | |
1528 | =item B<#targ> |
1529 | |
1530 | The numeric value of the OP's targ. |
1531 | |
1532 | =item B<#targarg> |
1533 | |
1534 | The name of the variable the OP's targ refers to, if any, otherwise the |
1535 | letter t followed by the OP's targ in decimal. |
1536 | |
1537 | =item B<#targarglife> |
1538 | |
1539 | Same as B<#targarg>, but followed by the COP sequence numbers that delimit |
1540 | the variable's lifetime (or 'end' for a variable in an open scope) for a |
1541 | variable. |
1542 | |
1543 | =item B<#typenum> |
1544 | |
1545 | The numeric value of the OP's type, in decimal. |
1546 | |
1547 | =back |
1548 | |
f9f861ec |
1549 | =head1 One-Liner Command tips |
1550 | |
1551 | =over 4 |
1552 | |
1553 | =item perl -MO=Concise,bar foo.pl |
1554 | |
1555 | Renders only bar() from foo.pl. To see main, drop the ',bar'. To see |
1556 | both, add ',-main' |
1557 | |
1558 | =item perl -MDigest::MD5=md5 -MO=Concise,md5 -e1 |
1559 | |
1560 | Identifies md5 as an XS function. The export is needed so that BC can |
1561 | find it in main. |
1562 | |
1563 | =item perl -MPOSIX -MO=Concise,_POSIX_ARG_MAX -e1 |
1564 | |
1565 | Identifies _POSIX_ARG_MAX as a constant sub, optimized to an IV. |
1566 | Although POSIX isn't entirely consistent across platforms, this is |
1567 | likely to be present in virtually all of them. |
1568 | |
1569 | =item perl -MPOSIX -MO=Concise,a -e 'print _POSIX_SAVED_IDS' |
1570 | |
1571 | This renders a print statement, which includes a call to the function. |
1572 | It's identical to rendering a file with a use call and that single |
1573 | statement, except for the filename which appears in the nextstate ops. |
1574 | |
1575 | =item perl -MPOSIX -MO=Concise,a -e 'sub a{_POSIX_SAVED_IDS}' |
1576 | |
1577 | This is B<very> similar to previous, only the first two ops differ. This |
1578 | subroutine rendering is more representative, insofar as a single main |
1579 | program will have many subs. |
1580 | |
1581 | |
d5e42f17 |
1582 | =back |
f9f861ec |
1583 | |
78ad9108 |
1584 | =head1 Using B::Concise outside of the O framework |
1585 | |
cc02ea56 |
1586 | The common (and original) usage of B::Concise was for command-line |
1587 | renderings of simple code, as given in EXAMPLE. But you can also use |
1588 | B<B::Concise> from your code, and call compile() directly, and |
724aa791 |
1589 | repeatedly. By doing so, you can avoid the compile-time only |
cc02ea56 |
1590 | operation of O.pm, and even use the debugger to step through |
1591 | B::Concise::compile() itself. |
f95e3c3c |
1592 | |
cc02ea56 |
1593 | Once you're doing this, you may alter Concise output by adding new |
1594 | rendering styles, and by optionally adding callback routines which |
1595 | populate new variables, if such were referenced from those (just |
1596 | added) styles. |
f95e3c3c |
1597 | |
724aa791 |
1598 | =head2 Example: Altering Concise Renderings |
78ad9108 |
1599 | |
1600 | use B::Concise qw(set_style add_callback); |
cc02ea56 |
1601 | add_style($yourStyleName => $defaultfmt, $gotofmt, $treefmt); |
78ad9108 |
1602 | add_callback |
f95e3c3c |
1603 | ( sub { |
1604 | my ($h, $op, $format, $level, $stylename) = @_; |
78ad9108 |
1605 | $h->{variable} = some_func($op); |
cc02ea56 |
1606 | }); |
1607 | $walker = B::Concise::compile(@options,@subnames,@subrefs); |
1608 | $walker->(); |
78ad9108 |
1609 | |
f95e3c3c |
1610 | =head2 set_style() |
1611 | |
724aa791 |
1612 | B<set_style> accepts 3 arguments, and updates the three format-specs |
1613 | comprising a line-style (basic-exec, goto, tree). It has one minor |
1614 | drawback though; it doesn't register the style under a new name. This |
1615 | can become an issue if you render more than once and switch styles. |
1616 | Thus you may prefer to use add_style() and/or set_style_standard() |
1617 | instead. |
1618 | |
1619 | =head2 set_style_standard($name) |
1620 | |
1621 | This restores one of the standard line-styles: C<terse>, C<concise>, |
1622 | C<linenoise>, C<debug>, C<env>, into effect. It also accepts style |
1623 | names previously defined with add_style(). |
f95e3c3c |
1624 | |
1625 | =head2 add_style() |
78ad9108 |
1626 | |
f95e3c3c |
1627 | This subroutine accepts a new style name and three style arguments as |
1628 | above, and creates, registers, and selects the newly named style. It is |
1629 | an error to re-add a style; call set_style_standard() to switch between |
1630 | several styles. |
1631 | |
f95e3c3c |
1632 | =head2 add_callback() |
1633 | |
19e169bf |
1634 | If your newly minted styles refer to any new #variables, you'll need |
1635 | to define a callback subroutine that will populate (or modify) those |
1636 | variables. They are then available for use in the style you've |
1637 | chosen. |
f95e3c3c |
1638 | |
1639 | The callbacks are called for each opcode visited by Concise, in the |
1640 | same order as they are added. Each subroutine is passed five |
1641 | parameters. |
1642 | |
1643 | 1. A hashref, containing the variable names and values which are |
1644 | populated into the report-line for the op |
1645 | 2. the op, as a B<B::OP> object |
1646 | 3. a reference to the format string |
1647 | 4. the formatting (indent) level |
1648 | 5. the selected stylename |
78ad9108 |
1649 | |
1650 | To define your own variables, simply add them to the hash, or change |
1651 | existing values if you need to. The level and format are passed in as |
1652 | references to scalars, but it is unlikely that they will need to be |
1653 | changed or even used. |
1654 | |
724aa791 |
1655 | =head2 Running B::Concise::compile() |
f95e3c3c |
1656 | |
1657 | B<compile> accepts options as described above in L</OPTIONS>, and |
1658 | arguments, which are either coderefs, or subroutine names. |
1659 | |
cc02ea56 |
1660 | It constructs and returns a $treewalker coderef, which when invoked, |
1661 | traverses, or walks, and renders the optrees of the given arguments to |
1662 | STDOUT. You can reuse this, and can change the rendering style used |
1663 | each time; thereafter the coderef renders in the new style. |
f95e3c3c |
1664 | |
1665 | B<walk_output> lets you change the print destination from STDOUT to |
19e169bf |
1666 | another open filehandle, or into a string passed as a ref (unless |
1667 | you've built perl with -Uuseperlio). |
f95e3c3c |
1668 | |
cc02ea56 |
1669 | my $walker = B::Concise::compile('-terse','aFuncName', \&aSubRef); # 1 |
f95e3c3c |
1670 | walk_output(\my $buf); |
cc02ea56 |
1671 | $walker->(); # 1 renders -terse |
1672 | set_style_standard('concise'); # 2 |
1673 | $walker->(); # 2 renders -concise |
1674 | $walker->(@new); # 3 renders whatever |
1675 | print "3 different renderings: terse, concise, and @new: $buf\n"; |
1676 | |
1677 | When $walker is called, it traverses the subroutines supplied when it |
1678 | was created, and renders them using the current style. You can change |
1679 | the style afterwards in several different ways: |
1680 | |
1681 | 1. call C<compile>, altering style or mode/order |
1682 | 2. call C<set_style_standard> |
1683 | 3. call $walker, passing @new options |
1684 | |
1685 | Passing new options to the $walker is the easiest way to change |
1686 | amongst any pre-defined styles (the ones you add are automatically |
1687 | recognized as options), and is the only way to alter rendering order |
1688 | without calling compile again. Note however that rendering state is |
1689 | still shared amongst multiple $walker objects, so they must still be |
1690 | used in a coordinated manner. |
f95e3c3c |
1691 | |
1692 | =head2 B::Concise::reset_sequence() |
1693 | |
1694 | This function (not exported) lets you reset the sequence numbers (note |
1695 | that they're numbered arbitrarily, their goal being to be human |
1696 | readable). Its purpose is mostly to support testing, i.e. to compare |
1697 | the concise output from two identical anonymous subroutines (but |
1698 | different instances). Without the reset, B::Concise, seeing that |
1699 | they're separate optrees, generates different sequence numbers in |
1700 | the output. |
1701 | |
1702 | =head2 Errors |
1703 | |
9a3b3024 |
1704 | Errors in rendering (non-existent function-name, non-existent coderef) |
1705 | are written to the STDOUT, or wherever you've set it via |
1706 | walk_output(). |
31b49ad4 |
1707 | |
9a3b3024 |
1708 | Errors using the various *style* calls, and bad args to walk_output(), |
1709 | result in die(). Use an eval if you wish to catch these errors and |
1710 | continue processing. |
78ad9108 |
1711 | |
c99ca59a |
1712 | =head1 AUTHOR |
1713 | |
31b49ad4 |
1714 | Stephen McCamant, E<lt>smcc@CSUA.Berkeley.EDUE<gt>. |
c99ca59a |
1715 | |
1716 | =cut |