620 lines
20 KiB
Perl
620 lines
20 KiB
Perl
package Carp;
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{ use 5.006; }
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use strict;
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use warnings;
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BEGIN {
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# Very old versions of warnings.pm load Carp. This can go wrong due
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# to the circular dependency. If warnings is invoked before Carp,
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# then warnings starts by loading Carp, then Carp (above) tries to
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# invoke warnings, and gets nothing because warnings is in the process
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# of loading and hasn't defined its import method yet. If we were
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# only turning on warnings ("use warnings" above) this wouldn't be too
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# bad, because Carp would just gets the state of the -w switch and so
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# might not get some warnings that it wanted. The real problem is
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# that we then want to turn off Unicode warnings, but "no warnings
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# 'utf8'" won't be effective if we're in this circular-dependency
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# situation. So, if warnings.pm is an affected version, we turn
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# off all warnings ourselves by directly setting ${^WARNING_BITS}.
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# On unaffected versions, we turn off just Unicode warnings, via
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# the proper API.
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if(!defined($warnings::VERSION) || eval($warnings::VERSION) < 1.06) {
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${^WARNING_BITS} = "";
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} else {
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"warnings"->unimport("utf8");
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}
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}
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sub _fetch_sub { # fetch sub without autovivifying
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my($pack, $sub) = @_;
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$pack .= '::';
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# only works with top-level packages
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return unless exists($::{$pack});
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for ($::{$pack}) {
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return unless ref \$_ eq 'GLOB' && *$_{HASH} && exists $$_{$sub};
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for ($$_{$sub}) {
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return ref \$_ eq 'GLOB' ? *$_{CODE} : undef
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}
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}
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}
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# UTF8_REGEXP_PROBLEM is a compile-time constant indicating whether Carp
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# must avoid applying a regular expression to an upgraded (is_utf8)
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# string. There are multiple problems, on different Perl versions,
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# that require this to be avoided. All versions prior to 5.13.8 will
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# load utf8_heavy.pl for the swash system, even if the regexp doesn't
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# use character classes. Perl 5.6 and Perls [5.11.2, 5.13.11) exhibit
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# specific problems when Carp is being invoked in the aftermath of a
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# syntax error.
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BEGIN {
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if("$]" < 5.013011) {
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*UTF8_REGEXP_PROBLEM = sub () { 1 };
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} else {
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*UTF8_REGEXP_PROBLEM = sub () { 0 };
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}
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}
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# is_utf8() is essentially the utf8::is_utf8() function, which indicates
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# whether a string is represented in the upgraded form (using UTF-8
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# internally). As utf8::is_utf8() is only available from Perl 5.8
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# onwards, extra effort is required here to make it work on Perl 5.6.
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BEGIN {
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if(defined(my $sub = _fetch_sub utf8 => 'is_utf8')) {
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*is_utf8 = $sub;
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} else {
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# black magic for perl 5.6
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*is_utf8 = sub { unpack("C", "\xaa".$_[0]) != 170 };
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}
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}
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# The downgrade() function defined here is to be used for attempts to
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# downgrade where it is acceptable to fail. It must be called with a
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# second argument that is a true value.
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BEGIN {
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if(defined(my $sub = _fetch_sub utf8 => 'downgrade')) {
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*downgrade = \&{"utf8::downgrade"};
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} else {
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*downgrade = sub {
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my $r = "";
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my $l = length($_[0]);
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for(my $i = 0; $i != $l; $i++) {
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my $o = ord(substr($_[0], $i, 1));
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return if $o > 255;
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$r .= chr($o);
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}
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$_[0] = $r;
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};
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}
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}
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our $VERSION = '1.42';
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$VERSION =~ tr/_//d;
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our $MaxEvalLen = 0;
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our $Verbose = 0;
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our $CarpLevel = 0;
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our $MaxArgLen = 64; # How much of each argument to print. 0 = all.
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our $MaxArgNums = 8; # How many arguments to print. 0 = all.
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our $RefArgFormatter = undef; # allow caller to format reference arguments
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require Exporter;
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our @ISA = ('Exporter');
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our @EXPORT = qw(confess croak carp);
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our @EXPORT_OK = qw(cluck verbose longmess shortmess);
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our @EXPORT_FAIL = qw(verbose); # hook to enable verbose mode
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# The members of %Internal are packages that are internal to perl.
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# Carp will not report errors from within these packages if it
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# can. The members of %CarpInternal are internal to Perl's warning
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# system. Carp will not report errors from within these packages
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# either, and will not report calls *to* these packages for carp and
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# croak. They replace $CarpLevel, which is deprecated. The
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# $Max(EvalLen|(Arg(Len|Nums)) variables are used to specify how the eval
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# text and function arguments should be formatted when printed.
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our %CarpInternal;
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our %Internal;
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# disable these by default, so they can live w/o require Carp
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$CarpInternal{Carp}++;
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$CarpInternal{warnings}++;
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$Internal{Exporter}++;
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$Internal{'Exporter::Heavy'}++;
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# if the caller specifies verbose usage ("perl -MCarp=verbose script.pl")
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# then the following method will be called by the Exporter which knows
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# to do this thanks to @EXPORT_FAIL, above. $_[1] will contain the word
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# 'verbose'.
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sub export_fail { shift; $Verbose = shift if $_[0] eq 'verbose'; @_ }
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sub _cgc {
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no strict 'refs';
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return \&{"CORE::GLOBAL::caller"} if defined &{"CORE::GLOBAL::caller"};
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return;
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}
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sub longmess {
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local($!, $^E);
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# Icky backwards compatibility wrapper. :-(
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#
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# The story is that the original implementation hard-coded the
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# number of call levels to go back, so calls to longmess were off
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# by one. Other code began calling longmess and expecting this
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# behaviour, so the replacement has to emulate that behaviour.
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my $cgc = _cgc();
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my $call_pack = $cgc ? $cgc->() : caller();
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if ( $Internal{$call_pack} or $CarpInternal{$call_pack} ) {
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return longmess_heavy(@_);
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}
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else {
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local $CarpLevel = $CarpLevel + 1;
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return longmess_heavy(@_);
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}
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}
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our @CARP_NOT;
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sub shortmess {
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local($!, $^E);
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my $cgc = _cgc();
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# Icky backwards compatibility wrapper. :-(
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local @CARP_NOT = $cgc ? $cgc->() : caller();
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shortmess_heavy(@_);
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}
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sub croak { die shortmess @_ }
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sub confess { die longmess @_ }
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sub carp { warn shortmess @_ }
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sub cluck { warn longmess @_ }
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BEGIN {
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if("$]" >= 5.015002 || ("$]" >= 5.014002 && "$]" < 5.015) ||
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("$]" >= 5.012005 && "$]" < 5.013)) {
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*CALLER_OVERRIDE_CHECK_OK = sub () { 1 };
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} else {
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*CALLER_OVERRIDE_CHECK_OK = sub () { 0 };
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}
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}
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sub caller_info {
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my $i = shift(@_) + 1;
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my %call_info;
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my $cgc = _cgc();
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{
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# Some things override caller() but forget to implement the
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# @DB::args part of it, which we need. We check for this by
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# pre-populating @DB::args with a sentinel which no-one else
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# has the address of, so that we can detect whether @DB::args
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# has been properly populated. However, on earlier versions
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# of perl this check tickles a bug in CORE::caller() which
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# leaks memory. So we only check on fixed perls.
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@DB::args = \$i if CALLER_OVERRIDE_CHECK_OK;
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package DB;
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@call_info{
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qw(pack file line sub has_args wantarray evaltext is_require) }
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= $cgc ? $cgc->($i) : caller($i);
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}
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unless ( defined $call_info{file} ) {
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return ();
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}
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my $sub_name = Carp::get_subname( \%call_info );
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if ( $call_info{has_args} ) {
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my @args;
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if (CALLER_OVERRIDE_CHECK_OK && @DB::args == 1
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&& ref $DB::args[0] eq ref \$i
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&& $DB::args[0] == \$i ) {
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@DB::args = (); # Don't let anyone see the address of $i
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local $@;
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my $where = eval {
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my $func = $cgc or return '';
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my $gv =
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(_fetch_sub B => 'svref_2object' or return '')
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->($func)->GV;
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my $package = $gv->STASH->NAME;
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my $subname = $gv->NAME;
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return unless defined $package && defined $subname;
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# returning CORE::GLOBAL::caller isn't useful for tracing the cause:
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return if $package eq 'CORE::GLOBAL' && $subname eq 'caller';
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" in &${package}::$subname";
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} || '';
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@args
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= "** Incomplete caller override detected$where; \@DB::args were not set **";
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}
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else {
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@args = @DB::args;
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my $overflow;
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if ( $MaxArgNums and @args > $MaxArgNums )
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{ # More than we want to show?
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$#args = $MaxArgNums - 1;
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$overflow = 1;
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}
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@args = map { Carp::format_arg($_) } @args;
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if ($overflow) {
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push @args, '...';
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}
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}
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# Push the args onto the subroutine
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$sub_name .= '(' . join( ', ', @args ) . ')';
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}
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$call_info{sub_name} = $sub_name;
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return wantarray() ? %call_info : \%call_info;
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}
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# Transform an argument to a function into a string.
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our $in_recurse;
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sub format_arg {
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my $arg = shift;
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if ( ref($arg) ) {
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# legitimate, let's not leak it.
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if (!$in_recurse &&
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do {
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local $@;
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local $in_recurse = 1;
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local $SIG{__DIE__} = sub{};
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eval {$arg->can('CARP_TRACE') }
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})
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{
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return $arg->CARP_TRACE();
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}
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elsif (!$in_recurse &&
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defined($RefArgFormatter) &&
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do {
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local $@;
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local $in_recurse = 1;
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local $SIG{__DIE__} = sub{};
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eval {$arg = $RefArgFormatter->($arg); 1}
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})
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{
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return $arg;
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}
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else
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{
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my $sub = _fetch_sub(overload => 'StrVal');
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return $sub ? &$sub($arg) : "$arg";
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}
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}
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return "undef" if !defined($arg);
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downgrade($arg, 1);
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return $arg if !(UTF8_REGEXP_PROBLEM && is_utf8($arg)) &&
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$arg =~ /\A-?[0-9]+(?:\.[0-9]*)?(?:[eE][-+]?[0-9]+)?\z/;
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my $suffix = "";
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if ( 2 < $MaxArgLen and $MaxArgLen < length($arg) ) {
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substr ( $arg, $MaxArgLen - 3 ) = "";
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$suffix = "...";
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}
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if(UTF8_REGEXP_PROBLEM && is_utf8($arg)) {
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for(my $i = length($arg); $i--; ) {
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my $c = substr($arg, $i, 1);
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my $x = substr($arg, 0, 0); # work around bug on Perl 5.8.{1,2}
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if($c eq "\"" || $c eq "\\" || $c eq "\$" || $c eq "\@") {
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substr $arg, $i, 0, "\\";
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next;
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}
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my $o = ord($c);
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# This code is repeated in Regexp::CARP_TRACE()
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if ($] ge 5.007_003) {
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substr $arg, $i, 1, sprintf("\\x{%x}", $o)
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if utf8::native_to_unicode($o) < utf8::native_to_unicode(0x20)
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|| utf8::native_to_unicode($o) > utf8::native_to_unicode(0x7e);
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} elsif (ord("A") == 65) {
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substr $arg, $i, 1, sprintf("\\x{%x}", $o)
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if $o < 0x20 || $o > 0x7e;
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} else { # Early EBCDIC
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# 3 EBCDIC code pages supported then; all controls but one
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# are the code points below SPACE. The other one is 0x5F on
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# POSIX-BC; FF on the other two.
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substr $arg, $i, 1, sprintf("\\x{%x}", $o)
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if $o < ord(" ") || ((ord ("^") == 106)
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? $o == 0x5f
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: $o == 0xff);
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}
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}
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} else {
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$arg =~ s/([\"\\\$\@])/\\$1/g;
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# This is all the ASCII printables spelled-out. It is portable to all
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# Perl versions and platforms (such as EBCDIC). There are other more
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# compact ways to do this, but may not work everywhere every version.
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$arg =~ s/([^ !"\$\%#'()*+,\-.\/0123456789:;<=>?\@ABCDEFGHIJKLMNOPQRSTUVWXYZ\[\\\]^_`abcdefghijklmnopqrstuvwxyz\{|}~])/sprintf("\\x{%x}",ord($1))/eg;
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}
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downgrade($arg, 1);
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return "\"".$arg."\"".$suffix;
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}
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sub Regexp::CARP_TRACE {
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my $arg = "$_[0]";
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downgrade($arg, 1);
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if(UTF8_REGEXP_PROBLEM && is_utf8($arg)) {
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for(my $i = length($arg); $i--; ) {
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my $o = ord(substr($arg, $i, 1));
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my $x = substr($arg, 0, 0); # work around bug on Perl 5.8.{1,2}
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# This code is repeated in format_arg()
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if ($] ge 5.007_003) {
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substr $arg, $i, 1, sprintf("\\x{%x}", $o)
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if utf8::native_to_unicode($o) < utf8::native_to_unicode(0x20)
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|| utf8::native_to_unicode($o) > utf8::native_to_unicode(0x7e);
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} elsif (ord("A") == 65) {
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substr $arg, $i, 1, sprintf("\\x{%x}", $o)
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if $o < 0x20 || $o > 0x7e;
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} else { # Early EBCDIC
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substr $arg, $i, 1, sprintf("\\x{%x}", $o)
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if $o < ord(" ") || ((ord ("^") == 106)
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? $o == 0x5f
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: $o == 0xff);
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}
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}
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} else {
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# See comment in format_arg() about this same regex.
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$arg =~ s/([^ !"\$\%#'()*+,\-.\/0123456789:;<=>?\@ABCDEFGHIJKLMNOPQRSTUVWXYZ\[\\\]^_`abcdefghijklmnopqrstuvwxyz\{|}~])/sprintf("\\x{%x}",ord($1))/eg;
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}
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downgrade($arg, 1);
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my $suffix = "";
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if($arg =~ /\A\(\?\^?([a-z]*)(?:-[a-z]*)?:(.*)\)\z/s) {
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($suffix, $arg) = ($1, $2);
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}
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if ( 2 < $MaxArgLen and $MaxArgLen < length($arg) ) {
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substr ( $arg, $MaxArgLen - 3 ) = "";
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$suffix = "...".$suffix;
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}
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return "qr($arg)$suffix";
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}
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# Takes an inheritance cache and a package and returns
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# an anon hash of known inheritances and anon array of
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# inheritances which consequences have not been figured
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# for.
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sub get_status {
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my $cache = shift;
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my $pkg = shift;
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$cache->{$pkg} ||= [ { $pkg => $pkg }, [ trusts_directly($pkg) ] ];
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return @{ $cache->{$pkg} };
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}
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# Takes the info from caller() and figures out the name of
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# the sub/require/eval
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sub get_subname {
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my $info = shift;
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if ( defined( $info->{evaltext} ) ) {
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my $eval = $info->{evaltext};
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if ( $info->{is_require} ) {
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return "require $eval";
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}
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else {
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$eval =~ s/([\\\'])/\\$1/g;
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return "eval '" . str_len_trim( $eval, $MaxEvalLen ) . "'";
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}
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}
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# this can happen on older perls when the sub (or the stash containing it)
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# has been deleted
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if ( !defined( $info->{sub} ) ) {
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return '__ANON__::__ANON__';
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}
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return ( $info->{sub} eq '(eval)' ) ? 'eval {...}' : $info->{sub};
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}
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# Figures out what call (from the point of view of the caller)
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# the long error backtrace should start at.
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sub long_error_loc {
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my $i;
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my $lvl = $CarpLevel;
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{
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++$i;
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my $cgc = _cgc();
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my @caller = $cgc ? $cgc->($i) : caller($i);
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my $pkg = $caller[0];
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unless ( defined($pkg) ) {
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# This *shouldn't* happen.
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if (%Internal) {
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local %Internal;
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$i = long_error_loc();
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last;
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}
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elsif (defined $caller[2]) {
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# this can happen when the stash has been deleted
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# in that case, just assume that it's a reasonable place to
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# stop (the file and line data will still be intact in any
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# case) - the only issue is that we can't detect if the
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# deleted package was internal (so don't do that then)
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# -doy
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redo unless 0 > --$lvl;
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last;
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}
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else {
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return 2;
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}
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}
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redo if $CarpInternal{$pkg};
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redo unless 0 > --$lvl;
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redo if $Internal{$pkg};
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}
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return $i - 1;
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}
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sub longmess_heavy {
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if ( ref( $_[0] ) ) { # don't break references as exceptions
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return wantarray ? @_ : $_[0];
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}
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my $i = long_error_loc();
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return ret_backtrace( $i, @_ );
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}
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# Returns a full stack backtrace starting from where it is
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# told.
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sub ret_backtrace {
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my ( $i, @error ) = @_;
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my $mess;
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my $err = join '', @error;
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$i++;
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my $tid_msg = '';
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if ( defined &threads::tid ) {
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my $tid = threads->tid;
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$tid_msg = " thread $tid" if $tid;
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}
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my %i = caller_info($i);
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$mess = "$err at $i{file} line $i{line}$tid_msg";
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if( defined $. ) {
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local $@ = '';
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local $SIG{__DIE__};
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eval {
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CORE::die;
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};
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if($@ =~ /^Died at .*(, <.*?> (?:line|chunk) \d+).$/ ) {
|
|
$mess .= $1;
|
|
}
|
|
}
|
|
$mess .= "\.\n";
|
|
|
|
while ( my %i = caller_info( ++$i ) ) {
|
|
$mess .= "\t$i{sub_name} called at $i{file} line $i{line}$tid_msg\n";
|
|
}
|
|
|
|
return $mess;
|
|
}
|
|
|
|
sub ret_summary {
|
|
my ( $i, @error ) = @_;
|
|
my $err = join '', @error;
|
|
$i++;
|
|
|
|
my $tid_msg = '';
|
|
if ( defined &threads::tid ) {
|
|
my $tid = threads->tid;
|
|
$tid_msg = " thread $tid" if $tid;
|
|
}
|
|
|
|
my %i = caller_info($i);
|
|
return "$err at $i{file} line $i{line}$tid_msg\.\n";
|
|
}
|
|
|
|
sub short_error_loc {
|
|
# You have to create your (hash)ref out here, rather than defaulting it
|
|
# inside trusts *on a lexical*, as you want it to persist across calls.
|
|
# (You can default it on $_[2], but that gets messy)
|
|
my $cache = {};
|
|
my $i = 1;
|
|
my $lvl = $CarpLevel;
|
|
{
|
|
my $cgc = _cgc();
|
|
my $called = $cgc ? $cgc->($i) : caller($i);
|
|
$i++;
|
|
my $caller = $cgc ? $cgc->($i) : caller($i);
|
|
|
|
if (!defined($caller)) {
|
|
my @caller = $cgc ? $cgc->($i) : caller($i);
|
|
if (@caller) {
|
|
# if there's no package but there is other caller info, then
|
|
# the package has been deleted - treat this as a valid package
|
|
# in this case
|
|
redo if defined($called) && $CarpInternal{$called};
|
|
redo unless 0 > --$lvl;
|
|
last;
|
|
}
|
|
else {
|
|
return 0;
|
|
}
|
|
}
|
|
redo if $Internal{$caller};
|
|
redo if $CarpInternal{$caller};
|
|
redo if $CarpInternal{$called};
|
|
redo if trusts( $called, $caller, $cache );
|
|
redo if trusts( $caller, $called, $cache );
|
|
redo unless 0 > --$lvl;
|
|
}
|
|
return $i - 1;
|
|
}
|
|
|
|
sub shortmess_heavy {
|
|
return longmess_heavy(@_) if $Verbose;
|
|
return @_ if ref( $_[0] ); # don't break references as exceptions
|
|
my $i = short_error_loc();
|
|
if ($i) {
|
|
ret_summary( $i, @_ );
|
|
}
|
|
else {
|
|
longmess_heavy(@_);
|
|
}
|
|
}
|
|
|
|
# If a string is too long, trims it with ...
|
|
sub str_len_trim {
|
|
my $str = shift;
|
|
my $max = shift || 0;
|
|
if ( 2 < $max and $max < length($str) ) {
|
|
substr( $str, $max - 3 ) = '...';
|
|
}
|
|
return $str;
|
|
}
|
|
|
|
# Takes two packages and an optional cache. Says whether the
|
|
# first inherits from the second.
|
|
#
|
|
# Recursive versions of this have to work to avoid certain
|
|
# possible endless loops, and when following long chains of
|
|
# inheritance are less efficient.
|
|
sub trusts {
|
|
my $child = shift;
|
|
my $parent = shift;
|
|
my $cache = shift;
|
|
my ( $known, $partial ) = get_status( $cache, $child );
|
|
|
|
# Figure out consequences until we have an answer
|
|
while ( @$partial and not exists $known->{$parent} ) {
|
|
my $anc = shift @$partial;
|
|
next if exists $known->{$anc};
|
|
$known->{$anc}++;
|
|
my ( $anc_knows, $anc_partial ) = get_status( $cache, $anc );
|
|
my @found = keys %$anc_knows;
|
|
@$known{@found} = ();
|
|
push @$partial, @$anc_partial;
|
|
}
|
|
return exists $known->{$parent};
|
|
}
|
|
|
|
# Takes a package and gives a list of those trusted directly
|
|
sub trusts_directly {
|
|
my $class = shift;
|
|
no strict 'refs';
|
|
my $stash = \%{"$class\::"};
|
|
for my $var (qw/ CARP_NOT ISA /) {
|
|
# Don't try using the variable until we know it exists,
|
|
# to avoid polluting the caller's namespace.
|
|
if ( $stash->{$var} && *{$stash->{$var}}{ARRAY} && @{$stash->{$var}} ) {
|
|
return @{$stash->{$var}}
|
|
}
|
|
}
|
|
return;
|
|
}
|
|
|
|
if(!defined($warnings::VERSION) ||
|
|
do { no warnings "numeric"; $warnings::VERSION < 1.03 }) {
|
|
# Very old versions of warnings.pm import from Carp. This can go
|
|
# wrong due to the circular dependency. If Carp is invoked before
|
|
# warnings, then Carp starts by loading warnings, then warnings
|
|
# tries to import from Carp, and gets nothing because Carp is in
|
|
# the process of loading and hasn't defined its import method yet.
|
|
# So we work around that by manually exporting to warnings here.
|
|
no strict "refs";
|
|
*{"warnings::$_"} = \&$_ foreach @EXPORT;
|
|
}
|
|
|
|
1;
|
|
|
|
__END__
|
|
|