sub DEFAULT_OFF () { 2 }
my $tree = {
-
'all' => [ 5.008, {
- 'io' => [ 5.008, {
- 'pipe' => [ 5.008, DEFAULT_OFF],
- 'unopened' => [ 5.008, DEFAULT_OFF],
- 'closed' => [ 5.008, DEFAULT_OFF],
- 'newline' => [ 5.008, DEFAULT_OFF],
- 'exec' => [ 5.008, DEFAULT_OFF],
- 'layer' => [ 5.008, DEFAULT_OFF],
- 'syscalls' => [ 5.019, DEFAULT_OFF],
- }],
- 'syntax' => [ 5.008, {
- 'ambiguous' => [ 5.008, DEFAULT_OFF],
- 'semicolon' => [ 5.008, DEFAULT_OFF],
- 'precedence' => [ 5.008, DEFAULT_OFF],
- 'bareword' => [ 5.008, DEFAULT_OFF],
- 'reserved' => [ 5.008, DEFAULT_OFF],
- 'digit' => [ 5.008, DEFAULT_OFF],
- 'parenthesis' => [ 5.008, DEFAULT_OFF],
- 'printf' => [ 5.008, DEFAULT_OFF],
- 'prototype' => [ 5.008, DEFAULT_OFF],
- 'qw' => [ 5.008, DEFAULT_OFF],
+ 'io' => [ 5.008, {
+ 'pipe' => [ 5.008, DEFAULT_OFF],
+ 'unopened' => [ 5.008, DEFAULT_OFF],
+ 'closed' => [ 5.008, DEFAULT_OFF],
+ 'newline' => [ 5.008, DEFAULT_OFF],
+ 'exec' => [ 5.008, DEFAULT_OFF],
+ 'layer' => [ 5.008, DEFAULT_OFF],
+ 'syscalls' => [ 5.019, DEFAULT_OFF],
+ }],
+ 'syntax' => [ 5.008, {
+ 'ambiguous' => [ 5.008, DEFAULT_OFF],
+ 'semicolon' => [ 5.008, DEFAULT_OFF],
+ 'precedence' => [ 5.008, DEFAULT_OFF],
+ 'bareword' => [ 5.008, DEFAULT_OFF],
+ 'reserved' => [ 5.008, DEFAULT_OFF],
+ 'digit' => [ 5.008, DEFAULT_OFF],
+ 'parenthesis' => [ 5.008, DEFAULT_OFF],
+ 'printf' => [ 5.008, DEFAULT_OFF],
+ 'prototype' => [ 5.008, DEFAULT_OFF],
+ 'qw' => [ 5.008, DEFAULT_OFF],
'illegalproto' => [ 5.011, DEFAULT_OFF],
- }],
- 'severe' => [ 5.008, {
- 'inplace' => [ 5.008, DEFAULT_ON],
- 'internal' => [ 5.008, DEFAULT_OFF],
- 'debugging' => [ 5.008, DEFAULT_ON],
- 'malloc' => [ 5.008, DEFAULT_ON],
- }],
- 'deprecated' => [ 5.008, DEFAULT_ON],
- 'void' => [ 5.008, DEFAULT_OFF],
- 'recursion' => [ 5.008, DEFAULT_OFF],
- 'redefine' => [ 5.008, DEFAULT_OFF],
- 'numeric' => [ 5.008, DEFAULT_OFF],
- 'uninitialized' => [ 5.008, DEFAULT_OFF],
- 'once' => [ 5.008, DEFAULT_OFF],
- 'misc' => [ 5.008, DEFAULT_OFF],
- 'regexp' => [ 5.008, DEFAULT_OFF],
- 'glob' => [ 5.008, DEFAULT_ON],
- 'untie' => [ 5.008, DEFAULT_OFF],
- 'substr' => [ 5.008, DEFAULT_OFF],
- 'taint' => [ 5.008, DEFAULT_OFF],
- 'signal' => [ 5.008, DEFAULT_OFF],
- 'closure' => [ 5.008, DEFAULT_OFF],
- 'overflow' => [ 5.008, DEFAULT_OFF],
- 'portable' => [ 5.008, DEFAULT_OFF],
- 'utf8' => [ 5.008, {
+ }],
+ 'severe' => [ 5.008, {
+ 'inplace' => [ 5.008, DEFAULT_ON],
+ 'internal' => [ 5.008, DEFAULT_OFF],
+ 'debugging' => [ 5.008, DEFAULT_ON],
+ 'malloc' => [ 5.008, DEFAULT_ON],
+ }],
+ 'deprecated' => [ 5.008, DEFAULT_ON],
+ 'void' => [ 5.008, DEFAULT_OFF],
+ 'recursion' => [ 5.008, DEFAULT_OFF],
+ 'redefine' => [ 5.008, DEFAULT_OFF],
+ 'numeric' => [ 5.008, DEFAULT_OFF],
+ 'uninitialized' => [ 5.008, DEFAULT_OFF],
+ 'once' => [ 5.008, DEFAULT_OFF],
+ 'misc' => [ 5.008, DEFAULT_OFF],
+ 'regexp' => [ 5.008, DEFAULT_OFF],
+ 'glob' => [ 5.008, DEFAULT_ON],
+ 'untie' => [ 5.008, DEFAULT_OFF],
+ 'substr' => [ 5.008, DEFAULT_OFF],
+ 'taint' => [ 5.008, DEFAULT_OFF],
+ 'signal' => [ 5.008, DEFAULT_OFF],
+ 'closure' => [ 5.008, DEFAULT_OFF],
+ 'overflow' => [ 5.008, DEFAULT_OFF],
+ 'portable' => [ 5.008, DEFAULT_OFF],
+ 'utf8' => [ 5.008, {
'surrogate' => [ 5.013, DEFAULT_OFF],
'nonchar' => [ 5.013, DEFAULT_OFF],
'non_unicode' => [ 5.013, DEFAULT_OFF],
}],
- 'exiting' => [ 5.008, DEFAULT_OFF],
- 'pack' => [ 5.008, DEFAULT_OFF],
- 'unpack' => [ 5.008, DEFAULT_OFF],
- 'threads' => [ 5.008, DEFAULT_OFF],
- 'imprecision' => [ 5.011, DEFAULT_OFF],
- 'experimental' => [ 5.017, {
+ 'exiting' => [ 5.008, DEFAULT_OFF],
+ 'pack' => [ 5.008, DEFAULT_OFF],
+ 'unpack' => [ 5.008, DEFAULT_OFF],
+ 'threads' => [ 5.008, DEFAULT_OFF],
+ 'imprecision' => [ 5.011, DEFAULT_OFF],
+ 'experimental' => [ 5.017, {
'experimental::lexical_subs' =>
[ 5.017, DEFAULT_ON ],
'experimental::regex_sets' =>
[ 5.017, DEFAULT_ON ],
'experimental::postderef' =>
[ 5.019, DEFAULT_ON ],
- 'experimental::autoderef' =>
- [ 5.019, DEFAULT_ON ],
'experimental::signatures' =>
[ 5.019, DEFAULT_ON ],
+ 'experimental::win32_perlio' =>
+ [ 5.021, DEFAULT_ON ],
+ 'experimental::refaliasing' =>
+ [ 5.021, DEFAULT_ON ],
+ 'experimental::re_strict' =>
+ [ 5.021, DEFAULT_ON ],
+ 'experimental::const_attr' =>
+ [ 5.021, DEFAULT_ON ],
+ 'experimental::bitwise' =>
+ [ 5.021, DEFAULT_ON ],
}],
- #'default' => [ 5.008, DEFAULT_ON ],
- }],
-} ;
+ 'missing' => [ 5.021, DEFAULT_OFF],
+ 'redundant' => [ 5.021, DEFAULT_OFF],
+ 'locale' => [ 5.021, DEFAULT_ON],
+
+ #'default' => [ 5.008, DEFAULT_ON ],
+}]};
my @def ;
my %list ;
print $warn "\n/* Warnings Categories added in Perl $version */\n\n"
if $last_ver != $version ;
$name =~ y/:/_/;
- print $warn tab(5, "#define WARN_$name"), " $k\n" ;
+ print $warn tab(6, "#define WARN_$name"), " $k\n" ;
$last_ver = $version ;
}
print $warn "\n" ;
- print $warn tab(5, '#define WARNsize'), "$warn_size\n" ;
- print $warn tab(5, '#define WARN_ALLstring'), '"', ('\125' x $warn_size) , "\"\n" ;
- print $warn tab(5, '#define WARN_NONEstring'), '"', ('\0' x $warn_size) , "\"\n" ;
+ print $warn tab(6, '#define WARNsize'), " $warn_size\n" ;
+ print $warn tab(6, '#define WARN_ALLstring'), ' "', ('\125' x $warn_size) , "\"\n" ;
+ print $warn tab(6, '#define WARN_NONEstring'), ' "', ('\0' x $warn_size) , "\"\n" ;
print $warn <<'EOM';
while (<DATA>) {
last if /^KEYWORDS$/ ;
- if ($_ eq "=for warnings.pl tree-goes-here\n") {
- print $pm warningsTree($tree, " ");
- next;
- }
print $pm $_ ;
}
my $last_ver = 0;
-print $pm "our %Offsets = (\n" ;
+print $pm "our %Offsets = (" ;
foreach my $k (sort { $a <=> $b } keys %ValueToName) {
my ($name, $version) = @{ $ValueToName{$k} };
$name = lc $name;
$k *= 2 ;
if ( $last_ver != $version ) {
print $pm "\n";
- print $pm tab(4, " # Warnings Categories added in Perl $version");
- print $pm "\n\n";
+ print $pm tab(6, " # Warnings Categories added in Perl $version");
+ print $pm "\n";
}
- print $pm tab(4, " '$name'"), "=> $k,\n" ;
+ print $pm tab(6, " '$name'"), "=> $k,\n" ;
$last_ver = $version;
}
-print $pm " );\n\n" ;
+print $pm ");\n\n" ;
print $pm "our %Bits = (\n" ;
foreach my $k (sort keys %list) {
my $v = $list{$k} ;
my @list = sort { $a <=> $b } @$v ;
- print $pm tab(4, " '$k'"), '=> "',
+ print $pm tab(6, " '$k'"), '=> "',
mkHex($warn_size, map $_ * 2 , @list),
'", # [', mkRange(@list), "]\n" ;
}
-print $pm " );\n\n" ;
+print $pm ");\n\n" ;
print $pm "our %DeadBits = (\n" ;
foreach my $k (sort keys %list) {
my $v = $list{$k} ;
my @list = sort { $a <=> $b } @$v ;
- print $pm tab(4, " '$k'"), '=> "',
+ print $pm tab(6, " '$k'"), '=> "',
mkHex($warn_size, map $_ * 2 + 1 , @list),
'", # [', mkRange(@list), "]\n" ;
}
-print $pm " );\n\n" ;
-print $pm '$NONE = "', ('\0' x $warn_size) , "\";\n" ;
-print $pm '$DEFAULT = "', mkHex($warn_size, map $_ * 2, @def),
+print $pm ");\n\n" ;
+print $pm "# These are used by various things, including our own tests\n";
+print $pm tab(6, 'our $NONE'), '= "', ('\0' x $warn_size) , "\";\n" ;
+print $pm tab(6, 'our $DEFAULT'), '= "', mkHex($warn_size, map $_ * 2, @def),
'", # [', mkRange(@def), "]\n" ;
-print $pm '$LAST_BIT = ' . "$index ;\n" ;
-print $pm '$BYTES = ' . "$warn_size ;\n" ;
+print $pm tab(6, 'our $LAST_BIT'), '= ' . "$index ;\n" ;
+print $pm tab(6, 'our $BYTES'), '= ' . "$warn_size ;\n" ;
while (<DATA>) {
+ if ($_ eq "=for warnings.pl tree-goes-here\n") {
+ print $pm warningsTree($tree, " ");
+ next;
+ }
print $pm $_ ;
}
__END__
package warnings;
-our $VERSION = '1.23';
+our $VERSION = '1.33';
# Verify that we're called correctly so that warnings will work.
# see also strict.pm.
die("Incorrect use of pragma '${\__PACKAGE__}' at $f line $l.\n");
}
+KEYWORDS
+
+our $All = "" ; vec($All, $Offsets{'all'}, 2) = 3 ;
+
+sub Croaker
+{
+ require Carp; # this initializes %CarpInternal
+ local $Carp::CarpInternal{'warnings'};
+ delete $Carp::CarpInternal{'warnings'};
+ Carp::croak(@_);
+}
+
+sub _bits {
+ my $mask = shift ;
+ my $catmask ;
+ my $fatal = 0 ;
+ my $no_fatal = 0 ;
+
+ foreach my $word ( @_ ) {
+ if ($word eq 'FATAL') {
+ $fatal = 1;
+ $no_fatal = 0;
+ }
+ elsif ($word eq 'NONFATAL') {
+ $fatal = 0;
+ $no_fatal = 1;
+ }
+ elsif ($catmask = $Bits{$word}) {
+ $mask |= $catmask ;
+ $mask |= $DeadBits{$word} if $fatal ;
+ $mask &= ~($DeadBits{$word}|$All) if $no_fatal ;
+ }
+ else
+ { Croaker("Unknown warnings category '$word'")}
+ }
+
+ return $mask ;
+}
+
+sub bits
+{
+ # called from B::Deparse.pm
+ push @_, 'all' unless @_ ;
+ return _bits(undef, @_) ;
+}
+
+sub import
+{
+ shift;
+
+ my $mask = ${^WARNING_BITS} // ($^W ? $Bits{all} : $DEFAULT) ;
+
+ if (vec($mask, $Offsets{'all'}, 1)) {
+ $mask |= $Bits{'all'} ;
+ $mask |= $DeadBits{'all'} if vec($mask, $Offsets{'all'}+1, 1);
+ }
+
+ # append 'all' when implied (after a lone "FATAL" or "NONFATAL")
+ push @_, 'all' if @_==1 && ( $_[0] eq 'FATAL' || $_[0] eq 'NONFATAL' );
+
+ # Empty @_ is equivalent to @_ = 'all' ;
+ ${^WARNING_BITS} = @_ ? _bits($mask, @_) : $mask | $Bits{all} ;
+}
+
+sub unimport
+{
+ shift;
+
+ my $catmask ;
+ my $mask = ${^WARNING_BITS} // ($^W ? $Bits{all} : $DEFAULT) ;
+
+ if (vec($mask, $Offsets{'all'}, 1)) {
+ $mask |= $Bits{'all'} ;
+ $mask |= $DeadBits{'all'} if vec($mask, $Offsets{'all'}+1, 1);
+ }
+
+ # append 'all' when implied (empty import list or after a lone "FATAL")
+ push @_, 'all' if !@_ || @_==1 && $_[0] eq 'FATAL';
+
+ foreach my $word ( @_ ) {
+ if ($word eq 'FATAL') {
+ next;
+ }
+ elsif ($catmask = $Bits{$word}) {
+ $mask &= ~($catmask | $DeadBits{$word} | $All);
+ }
+ else
+ { Croaker("Unknown warnings category '$word'")}
+ }
+
+ ${^WARNING_BITS} = $mask ;
+}
+
+my %builtin_type; @builtin_type{qw(SCALAR ARRAY HASH CODE REF GLOB LVALUE Regexp)} = ();
+
+sub MESSAGE () { 4 };
+sub FATAL () { 2 };
+sub NORMAL () { 1 };
+
+sub __chk
+{
+ my $category ;
+ my $offset ;
+ my $isobj = 0 ;
+ my $wanted = shift;
+ my $has_message = $wanted & MESSAGE;
+
+ unless (@_ == 1 || @_ == ($has_message ? 2 : 0)) {
+ my $sub = (caller 1)[3];
+ my $syntax = $has_message ? "[category,] 'message'" : '[category]';
+ Croaker("Usage: $sub($syntax)");
+ }
+
+ my $message = pop if $has_message;
+
+ if (@_) {
+ # check the category supplied.
+ $category = shift ;
+ if (my $type = ref $category) {
+ Croaker("not an object")
+ if exists $builtin_type{$type};
+ $category = $type;
+ $isobj = 1 ;
+ }
+ $offset = $Offsets{$category};
+ Croaker("Unknown warnings category '$category'")
+ unless defined $offset;
+ }
+ else {
+ $category = (caller(1))[0] ;
+ $offset = $Offsets{$category};
+ Croaker("package '$category' not registered for warnings")
+ unless defined $offset ;
+ }
+
+ my $i;
+
+ if ($isobj) {
+ my $pkg;
+ $i = 2;
+ while (do { { package DB; $pkg = (caller($i++))[0] } } ) {
+ last unless @DB::args && $DB::args[0] =~ /^$category=/ ;
+ }
+ $i -= 2 ;
+ }
+ else {
+ $i = _error_loc(); # see where Carp will allocate the error
+ }
+
+ # Default to 0 if caller returns nothing. Default to $DEFAULT if it
+ # explicitly returns undef.
+ my(@callers_bitmask) = (caller($i))[9] ;
+ my $callers_bitmask =
+ @callers_bitmask ? $callers_bitmask[0] // $DEFAULT : 0 ;
+
+ my @results;
+ foreach my $type (FATAL, NORMAL) {
+ next unless $wanted & $type;
+
+ push @results, (vec($callers_bitmask, $offset + $type - 1, 1) ||
+ vec($callers_bitmask, $Offsets{'all'} + $type - 1, 1));
+ }
+
+ # &enabled and &fatal_enabled
+ return $results[0] unless $has_message;
+
+ # &warnif, and the category is neither enabled as warning nor as fatal
+ return if $wanted == (NORMAL | FATAL | MESSAGE)
+ && !($results[0] || $results[1]);
+
+ require Carp;
+ Carp::croak($message) if $results[0];
+ # will always get here for &warn. will only get here for &warnif if the
+ # category is enabled
+ Carp::carp($message);
+}
+
+sub _mkMask
+{
+ my ($bit) = @_;
+ my $mask = "";
+
+ vec($mask, $bit, 1) = 1;
+ return $mask;
+}
+
+sub register_categories
+{
+ my @names = @_;
+
+ for my $name (@names) {
+ if (! defined $Bits{$name}) {
+ $Bits{$name} = _mkMask($LAST_BIT);
+ vec($Bits{'all'}, $LAST_BIT, 1) = 1;
+ $Offsets{$name} = $LAST_BIT ++;
+ foreach my $k (keys %Bits) {
+ vec($Bits{$k}, $LAST_BIT, 1) = 0;
+ }
+ $DeadBits{$name} = _mkMask($LAST_BIT);
+ vec($DeadBits{'all'}, $LAST_BIT++, 1) = 1;
+ }
+ }
+}
+
+sub _error_loc {
+ require Carp;
+ goto &Carp::short_error_loc; # don't introduce another stack frame
+}
+
+sub enabled
+{
+ return __chk(NORMAL, @_);
+}
+
+sub fatal_enabled
+{
+ return __chk(FATAL, @_);
+}
+
+sub warn
+{
+ return __chk(FATAL | MESSAGE, @_);
+}
+
+sub warnif
+{
+ return __chk(NORMAL | FATAL | MESSAGE, @_);
+}
+
+# These are not part of any public interface, so we can delete them to save
+# space.
+delete @warnings::{qw(NORMAL FATAL MESSAGE)};
+
+1;
+__END__
=head1 NAME
warnings - Perl pragma to control optional warnings
=head2 Default Warnings and Optional Warnings
Before the introduction of lexical warnings, Perl had two classes of
-warnings: mandatory and optional.
+warnings: mandatory and optional.
As its name suggests, if your code tripped a mandatory warning, you
would get a warning whether you wanted it or not.
The B<-w> flag just sets the global C<$^W> variable as in 5.005. This
means that any legacy code that currently relies on manipulating C<$^W>
-to control warning behavior will still work as is.
+to control warning behavior will still work as is.
=item 3.
no warnings qw(io syntax untie);
Also like the "strict" pragma, if there is more than one instance of the
-C<warnings> pragma in a given scope the cumulative effect is additive.
+C<warnings> pragma in a given scope the cumulative effect is additive.
use warnings qw(void); # only "void" warnings enabled
...
sub-category of the "syntax" category. It is now a top-level category
in its own right.
+Note: Before 5.21.0, the "missing" lexical warnings category was
+internally defined to be the same as the "uninitialized" category. It
+is now a top-level category in its own right.
+
=head2 Fatal Warnings
X<warning, fatal>
-The presence of the word "FATAL" in the category list will escalate any
-warnings detected from the categories specified in the lexical scope
-into fatal errors. In the code below, the use of C<time>, C<length>
+The presence of the word "FATAL" in the category list will escalate
+warnings in those categories into fatal errors in that lexical scope.
+
+B<NOTE:> FATAL warnings should be used with care, particularly
+C<< FATAL => 'all' >>.
+
+Libraries using L<warnings::warn|/FUNCTIONS> for custom warning categories
+generally don't expect L<warnings::warn|/FUNCTIONS> to be fatal and can wind up
+in an unexpected state as a result. For XS modules issuing categorized
+warnings, such unanticipated exceptions could also expose memory leak bugs.
+
+Moreover, the Perl interpreter itself has had serious bugs involving
+fatalized warnings. For a summary of resolved and unresolved problems as
+of January 2015, please see
+L<this perl5-porters post|http://www.nntp.perl.org/group/perl.perl5.porters/2015/01/msg225235.html>.
+
+While some developers find fatalizing some warnings to be a useful
+defensive programming technique, using C<< FATAL => 'all' >> to fatalize
+all possible warning categories -- including custom ones -- is particularly
+risky. Therefore, the use of C<< FATAL => 'all' >> is
+L<discouraged|perlpolicy/discouraged>.
+
+The L<strictures|strictures/VERSION-2> module on CPAN offers one example of
+a warnings subset that the module's authors believe is relatively safe to
+fatalize.
+
+B<NOTE:> users of FATAL warnings, especially those using
+C<< FATAL => 'all' >>, should be fully aware that they are risking future
+portability of their programs by doing so. Perl makes absolutely no
+commitments to not introduce new warnings or warnings categories in the
+future; indeed, we explicitly reserve the right to do so. Code that may
+not warn now may warn in a future release of Perl if the Perl5 development
+team deems it in the best interests of the community to do so. Should code
+using FATAL warnings break due to the introduction of a new warning we will
+NOT consider it an incompatible change. Users of FATAL warnings should
+take special caution during upgrades to check to see if their code triggers
+any new warnings and should pay particular attention to the fine print of
+the documentation of the features they use to ensure they do not exploit
+features that are documented as risky, deprecated, or unspecified, or where
+the documentation says "so don't do that", or anything with the same sense
+and spirit. Use of such features in combination with FATAL warnings is
+ENTIRELY AT THE USER'S RISK.
+
+The following documentation describes how to use FATAL warnings but the
+perl5 porters strongly recommend that you understand the risks before doing
+so, especially for library code intended for use by others, as there is no
+way for downstream users to change the choice of fatal categories.
+
+In the code below, the use of C<time>, C<length>
and C<join> can all produce a C<"Useless use of xxx in void context">
warning.
When run it produces this output
Useless use of time in void context at fatal line 3.
- Useless use of length in void context at fatal line 7.
+ Useless use of length in void context at fatal line 7.
The scope where C<length> is used has escalated the C<void> warnings
category into a fatal error, so the program terminates immediately when it
C<< no warnings 'FATAL'; >> was unspecified; they did not behave as if
they included the C<< => 'all' >> portion. As of 5.20, they do.)
-B<NOTE:> Users of FATAL warnings, especially
-those using C<< FATAL => 'all' >>
-should be fully aware that they are risking future portability of their
-programs by doing so. Perl makes absolutely no commitments to not
-introduce new warnings, or warnings categories in the future, and indeed
-we explicitly reserve the right to do so. Code that may not warn now may
-warn in a future release of Perl if the Perl5 development team deems it
-in the best interests of the community to do so. Should code using FATAL
-warnings break due to the introduction of a new warning we will NOT
-consider it an incompatible change. Users of FATAL warnings should take
-special caution during upgrades to check to see if their code triggers
-any new warnings and should pay particular attention to the fine print of
-the documentation of the features they use to ensure they do not exploit
-features that are documented as risky, deprecated, or unspecified, or where
-the documentation says "so don't do that", or anything with the same sense
-and spirit. Use of such features in combination with FATAL warnings is
-ENTIRELY AT THE USER'S RISK.
-
=head2 Reporting Warnings from a Module
X<warning, reporting> X<warning, registering>
package MyMod::Abc;
sub open {
- warnings::warnif("deprecated",
+ warnings::warnif("deprecated",
"open is deprecated, use new instead");
new(@_);
}
1;
-The code below makes use of both modules, but it only enables warnings from
+The code below makes use of both modules, but it only enables warnings from
C<Derived>.
use Original;
$a->doit(1);
When this code is run only the C<Derived> object, C<$b>, will generate
-a warning.
+a warning.
Odd numbers are unsafe at main.pl line 7
See also L<perlmodlib/Pragmatic Modules> and L<perldiag>.
=cut
-
-KEYWORDS
-
-$All = "" ; vec($All, $Offsets{'all'}, 2) = 3 ;
-
-sub Croaker
-{
- require Carp; # this initializes %CarpInternal
- local $Carp::CarpInternal{'warnings'};
- delete $Carp::CarpInternal{'warnings'};
- Carp::croak(@_);
-}
-
-sub _bits {
- my $mask = shift ;
- my $catmask ;
- my $fatal = 0 ;
- my $no_fatal = 0 ;
-
- foreach my $word ( @_ ) {
- if ($word eq 'FATAL') {
- $fatal = 1;
- $no_fatal = 0;
- }
- elsif ($word eq 'NONFATAL') {
- $fatal = 0;
- $no_fatal = 1;
- }
- elsif ($catmask = $Bits{$word}) {
- $mask |= $catmask ;
- $mask |= $DeadBits{$word} if $fatal ;
- $mask &= ~($DeadBits{$word}|$All) if $no_fatal ;
- }
- else
- { Croaker("Unknown warnings category '$word'")}
- }
-
- return $mask ;
-}
-
-sub bits
-{
- # called from B::Deparse.pm
- push @_, 'all' unless @_ ;
- return _bits(undef, @_) ;
-}
-
-sub import
-{
- shift;
-
- my $mask = ${^WARNING_BITS} // ($^W ? $Bits{all} : $DEFAULT) ;
-
- if (vec($mask, $Offsets{'all'}, 1)) {
- $mask |= $Bits{'all'} ;
- $mask |= $DeadBits{'all'} if vec($mask, $Offsets{'all'}+1, 1);
- }
-
- # append 'all' when implied (after a lone "FATAL" or "NONFATAL")
- push @_, 'all' if @_==1 && ( $_[0] eq 'FATAL' || $_[0] eq 'NONFATAL' );
-
- # Empty @_ is equivalent to @_ = 'all' ;
- ${^WARNING_BITS} = @_ ? _bits($mask, @_) : $mask | $Bits{all} ;
-}
-
-sub unimport
-{
- shift;
-
- my $catmask ;
- my $mask = ${^WARNING_BITS} // ($^W ? $Bits{all} : $DEFAULT) ;
-
- if (vec($mask, $Offsets{'all'}, 1)) {
- $mask |= $Bits{'all'} ;
- $mask |= $DeadBits{'all'} if vec($mask, $Offsets{'all'}+1, 1);
- }
-
- # append 'all' when implied (empty import list or after a lone "FATAL")
- push @_, 'all' if !@_ || @_==1 && $_[0] eq 'FATAL';
-
- foreach my $word ( @_ ) {
- if ($word eq 'FATAL') {
- next;
- }
- elsif ($catmask = $Bits{$word}) {
- $mask &= ~($catmask | $DeadBits{$word} | $All);
- }
- else
- { Croaker("Unknown warnings category '$word'")}
- }
-
- ${^WARNING_BITS} = $mask ;
-}
-
-my %builtin_type; @builtin_type{qw(SCALAR ARRAY HASH CODE REF GLOB LVALUE Regexp)} = ();
-
-sub MESSAGE () { 4 };
-sub FATAL () { 2 };
-sub NORMAL () { 1 };
-
-sub __chk
-{
- my $category ;
- my $offset ;
- my $isobj = 0 ;
- my $wanted = shift;
- my $has_message = $wanted & MESSAGE;
-
- unless (@_ == 1 || @_ == ($has_message ? 2 : 0)) {
- my $sub = (caller 1)[3];
- my $syntax = $has_message ? "[category,] 'message'" : '[category]';
- Croaker("Usage: $sub($syntax)");
- }
-
- my $message = pop if $has_message;
-
- if (@_) {
- # check the category supplied.
- $category = shift ;
- if (my $type = ref $category) {
- Croaker("not an object")
- if exists $builtin_type{$type};
- $category = $type;
- $isobj = 1 ;
- }
- $offset = $Offsets{$category};
- Croaker("Unknown warnings category '$category'")
- unless defined $offset;
- }
- else {
- $category = (caller(1))[0] ;
- $offset = $Offsets{$category};
- Croaker("package '$category' not registered for warnings")
- unless defined $offset ;
- }
-
- my $i;
-
- if ($isobj) {
- my $pkg;
- $i = 2;
- while (do { { package DB; $pkg = (caller($i++))[0] } } ) {
- last unless @DB::args && $DB::args[0] =~ /^$category=/ ;
- }
- $i -= 2 ;
- }
- else {
- $i = _error_loc(); # see where Carp will allocate the error
- }
-
- # Default to 0 if caller returns nothing. Default to $DEFAULT if it
- # explicitly returns undef.
- my(@callers_bitmask) = (caller($i))[9] ;
- my $callers_bitmask =
- @callers_bitmask ? $callers_bitmask[0] // $DEFAULT : 0 ;
-
- my @results;
- foreach my $type (FATAL, NORMAL) {
- next unless $wanted & $type;
-
- push @results, (vec($callers_bitmask, $offset + $type - 1, 1) ||
- vec($callers_bitmask, $Offsets{'all'} + $type - 1, 1));
- }
-
- # &enabled and &fatal_enabled
- return $results[0] unless $has_message;
-
- # &warnif, and the category is neither enabled as warning nor as fatal
- return if $wanted == (NORMAL | FATAL | MESSAGE)
- && !($results[0] || $results[1]);
-
- require Carp;
- Carp::croak($message) if $results[0];
- # will always get here for &warn. will only get here for &warnif if the
- # category is enabled
- Carp::carp($message);
-}
-
-sub _mkMask
-{
- my ($bit) = @_;
- my $mask = "";
-
- vec($mask, $bit, 1) = 1;
- return $mask;
-}
-
-sub register_categories
-{
- my @names = @_;
-
- for my $name (@names) {
- if (! defined $Bits{$name}) {
- $Bits{$name} = _mkMask($LAST_BIT);
- vec($Bits{'all'}, $LAST_BIT, 1) = 1;
- $Offsets{$name} = $LAST_BIT ++;
- foreach my $k (keys %Bits) {
- vec($Bits{$k}, $LAST_BIT, 1) = 0;
- }
- $DeadBits{$name} = _mkMask($LAST_BIT);
- vec($DeadBits{'all'}, $LAST_BIT++, 1) = 1;
- }
- }
-}
-
-sub _error_loc {
- require Carp;
- goto &Carp::short_error_loc; # don't introduce another stack frame
-}
-
-sub enabled
-{
- return __chk(NORMAL, @_);
-}
-
-sub fatal_enabled
-{
- return __chk(FATAL, @_);
-}
-
-sub warn
-{
- return __chk(FATAL | MESSAGE, @_);
-}
-
-sub warnif
-{
- return __chk(NORMAL | FATAL | MESSAGE, @_);
-}
-
-# These are not part of any public interface, so we can delete them to save
-# space.
-delete @warnings::{qw(NORMAL FATAL MESSAGE)};
-
-1;
https://perl5.git.perl.org / perl5.git / blobdiff