3 # Regenerate (overwriting only if changed):
8 # from information stored in this file. pod/perlguts.pod is not completely
9 # regenerated. Only the magic table is replaced; the other parts remain
12 # Accepts the standard regen_lib -q and -v args.
14 # This script is normally invoked from regen.pl.
20 # Get function prototypes
21 require 'regen/regen_lib.pl';
26 sv => { char => '\0', vtable => 'sv', readonly_acceptable => 1,
27 desc => 'Special scalar variable' },
28 overload => { char => 'A', vtable => 'amagic', desc => '%OVERLOAD hash' },
29 overload_elem => { char => 'a', vtable => 'amagicelem',
30 desc => '%OVERLOAD hash element' },
31 overload_table => { char => 'c', vtable => 'ovrld',
32 desc => 'Holds overload table (AMT) on stash' },
33 bm => { char => 'B', vtable => 'regexp', value_magic => 1,
34 readonly_acceptable => 1,
35 desc => 'Boyer-Moore (fast string search)' },
36 regdata => { char => 'D', vtable => 'regdata',
37 desc => "Regex match position data\n(\@+ and \@- vars)" },
38 regdatum => { char => 'd', vtable => 'regdatum',
39 desc => 'Regex match position data element' },
40 env => { char => 'E', vtable => 'env', desc => '%ENV hash' },
41 envelem => { char => 'e', vtable => 'envelem',
42 desc => '%ENV hash element' },
43 fm => { char => 'f', vtable => 'regdata', value_magic => 1,
44 readonly_acceptable => 1, desc => "Formline ('compiled' format)" },
45 study => { char => 'G', vtable => 'regexp', value_magic => 1,
46 readonly_acceptable => 1, desc => 'study()ed string' },
47 regex_global => { char => 'g', vtable => 'mglob', value_magic => 1,
48 readonly_acceptable => 1, desc => 'm//g target' },
49 hints => { char => 'H', vtable => 'hints', desc => '%^H hash' },
50 hintselem => { char => 'h', vtable => 'hintselem',
51 desc => '%^H hash element' },
52 isa => { char => 'I', vtable => 'isa', desc => '@ISA array' },
53 isaelem => { char => 'i', vtable => 'isaelem',
54 desc => '@ISA array element' },
55 nkeys => { char => 'k', vtable => 'nkeys', value_magic => 1,
56 desc => 'scalar(keys()) lvalue' },
57 dbfile => { char => 'L',
58 desc => 'Debugger %_<filename' },
59 dbline => { char => 'l', vtable => 'dbline',
60 desc => 'Debugger %_<filename element' },
61 shared => { char => 'N', desc => 'Shared between threads',
62 unknown_to_sv_magic => 1 },
63 shared_scalar => { char => 'n', desc => 'Shared between threads',
64 unknown_to_sv_magic => 1 },
65 collxfrm => { char => 'o', vtable => 'collxfrm', value_magic => 1,
66 desc => 'Locale transformation' },
67 tied => { char => 'P', vtable => 'pack',
68 value_magic => 1, # treat as value, so 'local @tied' isn't tied
69 desc => 'Tied array or hash' },
70 tiedelem => { char => 'p', vtable => 'packelem',
71 desc => 'Tied array or hash element' },
72 tiedscalar => { char => 'q', vtable => 'packelem',
73 desc => 'Tied scalar or handle' },
74 qr => { char => 'r', vtable => 'regexp', value_magic => 1,
75 desc => 'precompiled qr// regex' },
76 sig => { char => 'S', desc => '%SIG hash' },
77 sigelem => { char => 's', vtable => 'sigelem',
78 desc => '%SIG hash element' },
79 taint => { char => 't', vtable => 'taint', value_magic => 1,
80 desc => 'Taintedness' },
81 uvar => { char => 'U', vtable => 'uvar',
82 desc => 'Available for use by extensions' },
83 uvar_elem => { char => 'u', desc => 'Reserved for use by extensions',
84 unknown_to_sv_magic => 1 },
85 vec => { char => 'v', vtable => 'vec', value_magic => 1,
86 desc => 'vec() lvalue' },
87 vstring => { char => 'V', value_magic => 1, vtable => 'vstring',
88 desc => 'SV was vstring literal' },
89 utf8 => { char => 'w', vtable => 'utf8', value_magic => 1,
90 desc => 'Cached UTF-8 information' },
91 substr => { char => 'x', vtable => 'substr', value_magic => 1,
92 desc => 'substr() lvalue' },
93 defelem => { char => 'y', vtable => 'defelem', value_magic => 1,
94 desc => "Shadow \"foreach\" iterator variable /\nsmart parameter vivification" },
95 arylen => { char => '#', vtable => 'arylen', value_magic => 1,
96 desc => 'Array length ($#ary)' },
97 pos => { char => '.', vtable => 'pos', value_magic => 1,
98 desc => 'pos() lvalue' },
99 backref => { char => '<', vtable => 'backref', value_magic => 1,
100 readonly_acceptable => 1, desc => 'for weak ref data' },
101 symtab => { char => ':', value_magic => 1,
102 desc => 'extra data for symbol tables' },
103 rhash => { char => '%', value_magic => 1,
104 desc => 'extra data for restricted hashes' },
105 arylen_p => { char => '@', value_magic => 1,
106 desc => 'to move arylen out of XPVAV' },
107 ext => { char => '~', desc => 'Available for use by extensions' },
108 checkcall => { char => ']', value_magic => 1,
109 desc => 'inlining/mutation of call to this CV'},
112 # These have a subtly different "namespace" from the magic types.
115 'sv' => {get => 'get', set => 'set', len => 'len'},
116 'env' => {set => 'set_all_env', clear => 'clear_all_env'},
117 'envelem' => {set => 'setenv', clear => 'clearenv'},
118 'sigelem' => {get => 'getsig', set => 'setsig', clear => 'clearsig',
119 cond => '#ifndef PERL_MICRO'},
120 'pack' => {len => 'sizepack', clear => 'wipepack'},
121 'packelem' => {get => 'getpack', set => 'setpack', clear => 'clearpack'},
122 'dbline' => {set => 'setdbline'},
123 'isa' => {set => 'setisa', clear => 'clearisa'},
124 'isaelem' => {set => 'setisa'},
125 'arylen' => {get => 'getarylen', set => 'setarylen', const => 1},
126 'arylen_p' => {free => 'freearylen_p'},
127 'mglob' => {set => 'setmglob'},
128 'nkeys' => {get => 'getnkeys', set => 'setnkeys'},
129 'taint' => {get => 'gettaint', set => 'settaint'},
130 'substr' => {get => 'getsubstr', set => 'setsubstr'},
131 'vec' => {get => 'getvec', set => 'setvec'},
132 'pos' => {get => 'getpos', set => 'setpos'},
133 'uvar' => {get => 'getuvar', set => 'setuvar'},
134 'defelem' => {get => 'getdefelem', set => 'setdefelem'},
135 'regexp' => {set => 'setregexp', alias => [qw(bm fm)]},
136 'regdata' => {len => 'regdata_cnt'},
137 'regdatum' => {get => 'regdatum_get', set => 'regdatum_set'},
138 'amagic' => {set => 'setamagic', free => 'setamagic'},
139 'amagicelem' => {set => 'setamagic', free => 'setamagic'},
140 'backref' => {free => 'killbackrefs'},
141 'ovrld' => {free => 'freeovrld'},
142 'utf8' => {set => 'setutf8'},
143 'collxfrm' => {set => 'setcollxfrm',
144 cond => '#ifdef USE_LOCALE_COLLATE'},
145 'hintselem' => {set => 'sethint', clear => 'clearhint'},
146 'hints' => {clear => 'clearhints'},
147 'vstring' => {set => 'setvstring'},
150 my ($vt, $raw, $names) = map {
152 { by => 'regen/mg_vtable.pl', file => $_, style => '*' });
153 } 'mg_vtable.h', 'mg_raw.h', 'mg_names.c';
154 my $guts = open_new("pod/perlguts.pod", ">");
157 /* These constants should be used in preference to raw characters
158 * when using magic. Note that some perl guts still assume
159 * certain character properties of these constants, namely that
160 * isUPPER() and toLOWER() may do useful mappings.
165 # Of course, it would be *much* easier if we could output this table directly
166 # here and now. However, for our sins, we try to support EBCDIC, which wouldn't
167 # be *so* bad, except that there are (at least) 3 EBCDIC charset variants, and
168 # they don't agree on the code point for '~'. Which we use. Great.
169 # So we have to get the local build runtime to sort our table in character order
170 # (And of course, just to be helpful, in POSIX BC '~' is \xFF, so we can't even
171 # simplify the C code by assuming that the last element of the array is
177 $longest = length $_ if length $_ > $longest;
180 my $longest_p1 = $longest + 1;
183 while (my ($name, $data) = each %mg) {
184 my $byte = eval qq{"$data->{char}"};
185 $data->{byte} = $byte;
186 $mg_order{(uc $byte) . $byte} = $name;
189 foreach (sort keys %mg_order) {
190 my $name = $mg_order{$_};
191 my $data = $mg{$name};
192 my $i = ord $data->{byte};
193 unless ($data->{unknown_to_sv_magic}) {
194 my $value = $data->{vtable}
195 ? "want_vtbl_$data->{vtable}" : 'magic_vtable_max';
196 $value .= ' | PERL_MAGIC_READONLY_ACCEPTABLE'
197 if $data->{readonly_acceptable};
198 $value .= ' | PERL_MAGIC_VALUE_MAGIC' if $data->{value_magic};
199 my $comment = "/* $name '$data->{char}' $data->{desc} */";
200 $comment =~ s/([\\"])/\\$1/g;
201 $comment =~ tr/\n/ /;
202 print $raw qq{ { '$data->{char}', "$value",\n "$comment" },\n};
205 my $comment = $data->{desc};
206 my $leader = ' ' x ($longest + 27);
207 $comment =~ s/\n/\n$leader/s;
208 printf $vt "#define PERL_MAGIC_%-${longest}s '%s' /* %s */\n",
209 $name, $data->{char}, $comment;
211 my $char = $data->{char};
212 $char =~ s/([\\"])/\\$1/g;
213 printf $names qq[\t{ PERL_MAGIC_%-${longest_p1}s "%s(%s)" },\n],
214 "$name,", $name, $char;
216 push @rows, [(sprintf "%-2s PERL_MAGIC_%s", $data->{char}, $name),
217 $data->{vtable} ? "vtbl_$data->{vtable}" : '(none)',
220 select +(select($guts), do {
221 my @header = ('(old-style char and macro)', 'MGVTBL', 'Type of magic');
223 foreach my $row (@rows) {
225 $widths[$_] = length $row->[$_]
226 if length $row->[$_] > $widths[$_];
231 = sprintf "$indent%%-%ds%%-%ds%%s\n", $widths[0] + 1, $widths[1] + 1;
233 79 - 7 - (length $indent) - $widths[0] - $widths[1] - 2;
235 open my $oldguts, "<", "pod/perlguts.pod"
236 or die "$0 cannot open pod/perlguts.pod for reading: $!";
239 last if /^=for mg_vtable.pl begin/
242 print "\n", $indent . "mg_type\n";
243 printf $format, @header;
244 printf $format, map {'-' x length $_} @header;
246 my ($type, $vtbl, $desc) = @$_;
249 if (length $desc > $desc_wrap) {
250 # If it's too long, first split on '(', if there.
251 # [Which, if there, is always short enough, currently.
252 # Make this more robust if that changes]
253 ($desc, @cont) = split /(?=\()/, $desc;
255 ($desc, @cont) = $desc =~ /(.{1,$desc_wrap})(?: |\z)/g
258 printf $format, $type, $vtbl, $desc;
259 printf $format, '', '', $_ foreach @cont;
264 last if /^=for mg_vtable.pl end/;
266 do { print } while <$oldguts>;
270 my @names = sort keys %sig;
272 my $want = join ",\n ", (map {"want_vtbl_$_"} @names), 'magic_vtable_max';
273 my $names = join qq{",\n "}, @names;
277 enum { /* pass one of these to get_vtbl */
282 EXTCONST char *PL_magic_vtable_names[magic_vtable_max] = {
286 EXTCONST char *PL_magic_vtable_names[magic_vtable_max];
293 /* These all need to be 0, not NULL, as NULL can be (void*)0, which is a
294 * pointer to data, whereas we're assigning pointers to functions, which are
295 * not the same beast. ANSI doesn't allow the assignment from one to the other.
296 * (although most, but not all, compilers are prepared to do it)
311 EXT_MGVTBL PL_magic_vtables[magic_vtable_max] = {
317 while (my $name = shift @names) {
318 my $data = $sig{$name};
319 push @vtable_names, $name;
321 $data->{$_} ? "Perl_magic_$data->{$_}" : 0;
322 } qw(get set len clear free copy dup local);
324 $funcs[0] = "(int (*)(pTHX_ SV *, MAGIC *))" . $funcs[0] if $data->{const};
325 my $funcs = join ", ", @funcs;
327 # Because we can't have a , after the last {...}
328 my $comma = @names ? ',' : '';
330 print $vt "$data->{cond}\n" if $data->{cond};
331 print $vt " { $funcs }$comma\n";
332 print $vt <<"EOH" if $data->{cond};
334 { 0, 0, 0, 0, 0, 0, 0, 0 }$comma
337 foreach(@{$data->{alias}}) {
338 push @aliases, "#define want_vtbl_$_ want_vtbl_$name\n";
339 push @vtable_names, $_;
346 EXT_MGVTBL PL_magic_vtables[magic_vtable_max];
351 print $vt (sort @aliases), "\n";
353 print $vt "#define PL_vtbl_$_ PL_magic_vtables[want_vtbl_$_]\n"
354 foreach sort @vtable_names;
356 # 63, not 64, As we rely on the last possible value to mean "NULL vtable"
357 die "Too many vtable names" if @vtable_names > 63;
359 read_only_bottom_close_and_rename($_) foreach $vt, $raw, $names;
360 close_and_rename($guts);