#
# This script is normally invoked from regen.pl.
-$VERSION = '1.03';
+$VERSION = '1.45';
BEGIN {
- require 'regen/regen_lib.pl';
+ require './regen/regen_lib.pl';
push @INC, './lib';
}
use strict ;
[ 5.017, DEFAULT_ON ],
'experimental::regex_sets' =>
[ 5.017, DEFAULT_ON ],
- 'experimental::lexical_topic' =>
- [ 5.017, DEFAULT_ON ],
'experimental::smartmatch' =>
[ 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::bitwise' =>
[ 5.021, DEFAULT_ON ],
+ 'experimental::declared_refs' =>
+ [ 5.025, DEFAULT_ON ],
+ 'experimental::script_run' =>
+ [ 5.027, DEFAULT_ON ],
+ 'experimental::alpha_assertions' =>
+ [ 5.027, DEFAULT_ON ],
+ 'experimental::private_use' =>
+ [ 5.029, DEFAULT_ON ],
+ 'experimental::uniprop_wildcards' =>
+ [ 5.029, DEFAULT_ON ],
+ 'experimental::vlb' =>
+ [ 5.029, DEFAULT_ON ],
}],
'missing' => [ 5.021, DEFAULT_OFF],
'redundant' => [ 5.021, DEFAULT_OFF],
'locale' => [ 5.021, DEFAULT_ON],
+ 'shadow' => [ 5.027, DEFAULT_OFF],
#'default' => [ 5.008, DEFAULT_ON ],
}]};
#define G_WARN_ALL_MASK (G_WARN_ALL_ON|G_WARN_ALL_OFF)
#define pWARN_STD NULL
-#define pWARN_ALL (((STRLEN*)0)+1) /* use warnings 'all' */
-#define pWARN_NONE (((STRLEN*)0)+2) /* no warnings 'all' */
+#define pWARN_ALL (STRLEN *) &PL_WARN_ALL /* use warnings 'all' */
+#define pWARN_NONE (STRLEN *) &PL_WARN_NONE /* no warnings 'all' */
#define specialWARN(x) ((x) == pWARN_STD || (x) == pWARN_ALL || \
(x) == pWARN_NONE)
EOM
walk ($tree) ;
+ for (my $i = $index; $i & 3; $i++) {
+ push @{$list{all}}, $i;
+ }
$index *= 2 ;
$warn_size = int($index / 8) + ($index % 8 != 0) ;
my $k ;
my $last_ver = 0;
+ my @names;
foreach $k (sort { $a <=> $b } keys %ValueToName) {
my ($name, $version) = @{ $ValueToName{$k} };
print $warn "\n/* Warnings Categories added in Perl $version */\n\n"
if $last_ver != $version ;
$name =~ y/:/_/;
- print $warn tab(6, "#define WARN_$name"), " $k\n" ;
+ $name = "WARN_$name";
+ print $warn tab(6, "#define $name"), " $k\n" ;
+ push @names, $name;
$last_ver = $version ;
}
- print $warn "\n" ;
+ print $warn "\n\n/*\n" ;
+
+ print $warn map { "=for apidoc Amnh||$_\n" } @names;
+ print $warn "\n=cut\n*/\n\n" ;
print $warn tab(6, '#define WARNsize'), " $warn_size\n" ;
print $warn tab(6, '#define WARN_ALLstring'), ' "', ('\125' x $warn_size) , "\"\n" ;
print $warn <<'EOM';
-#define isLEXWARN_on (PL_curcop->cop_warnings != pWARN_STD)
-#define isLEXWARN_off (PL_curcop->cop_warnings == pWARN_STD)
+#define isLEXWARN_on \
+ cBOOL(PL_curcop && PL_curcop->cop_warnings != pWARN_STD)
+#define isLEXWARN_off \
+ cBOOL(!PL_curcop || PL_curcop->cop_warnings == pWARN_STD)
#define isWARN_ONCE (PL_dowarn & (G_WARN_ON|G_WARN_ONCE))
#define isWARN_on(c,x) (IsSet((U8 *)(c + 1), 2*(x)))
#define isWARNf_on(c,x) (IsSet((U8 *)(c + 1), 2*(x)+1))
-#define DUP_WARNINGS(p) \
- (specialWARN(p) ? (STRLEN*)(p) \
- : (STRLEN*)CopyD(p, PerlMemShared_malloc(sizeof(*p)+*p), sizeof(*p)+*p, \
- char))
+#define DUP_WARNINGS(p) Perl_dup_warnings(aTHX_ p)
+
+/*
+
+=head1 Warning and Dieing
+
+In all these calls, the C<U32 wI<n>> parameters are warning category
+constants. You can see the ones currently available in
+L<warnings/Category Hierarchy>, just capitalize all letters in the names
+and prefix them by C<WARN_>. So, for example, the category C<void> used in a
+perl program becomes C<WARN_VOID> when used in XS code and passed to one of
+the calls below.
+
+=for apidoc Am|bool|ckWARN|U32 w
+
+Returns a boolean as to whether or not warnings are enabled for the warning
+category C<w>. If the category is by default enabled even if not within the
+scope of S<C<use warnings>>, instead use the L</ckWARN_d> macro.
+
+=for apidoc Am|bool|ckWARN_d|U32 w
+
+Like C<L</ckWARN>>, but for use if and only if the warning category is by
+default enabled even if not within the scope of S<C<use warnings>>.
+
+=for apidoc Am|bool|ckWARN2|U32 w1|U32 w2
+
+Like C<L</ckWARN>>, but takes two warnings categories as input, and returns
+TRUE if either is enabled. If either category is by default enabled even if
+not within the scope of S<C<use warnings>>, instead use the L</ckWARN2_d>
+macro. The categories must be completely independent, one may not be
+subclassed from the other.
+
+=for apidoc Am|bool|ckWARN2_d|U32 w1|U32 w2
+
+Like C<L</ckWARN2>>, but for use if and only if either warning category is by
+default enabled even if not within the scope of S<C<use warnings>>.
+
+=for apidoc Am|bool|ckWARN3|U32 w1|U32 w2|U32 w3
+
+Like C<L</ckWARN2>>, but takes three warnings categories as input, and returns
+TRUE if any is enabled. If any of the categories is by default enabled even
+if not within the scope of S<C<use warnings>>, instead use the L</ckWARN3_d>
+macro. The categories must be completely independent, one may not be
+subclassed from any other.
+
+=for apidoc Am|bool|ckWARN3_d|U32 w1|U32 w2|U32 w3
+
+Like C<L</ckWARN3>>, but for use if and only if any of the warning categories
+is by default enabled even if not within the scope of S<C<use warnings>>.
+
+=for apidoc Am|bool|ckWARN4|U32 w1|U32 w2|U32 w3|U32 w4
+
+Like C<L</ckWARN3>>, but takes four warnings categories as input, and returns
+TRUE if any is enabled. If any of the categories is by default enabled even
+if not within the scope of S<C<use warnings>>, instead use the L</ckWARN4_d>
+macro. The categories must be completely independent, one may not be
+subclassed from any other.
+
+=for apidoc Am|bool|ckWARN4_d|U32 w1|U32 w2|U32 w3|U32 w4
+
+Like C<L</ckWARN4>>, but for use if and only if any of the warning categories
+is by default enabled even if not within the scope of S<C<use warnings>>.
+
+=cut
+
+*/
#define ckWARN(w) Perl_ckwarn(aTHX_ packWARN(w))
#define unpackWARN4(x) (((x) >>24) & 0xFF)
#define ckDEAD(x) \
- ( ! specialWARN(PL_curcop->cop_warnings) && \
- ( isWARNf_on(PL_curcop->cop_warnings, WARN_ALL) || \
- isWARNf_on(PL_curcop->cop_warnings, unpackWARN1(x)) || \
- isWARNf_on(PL_curcop->cop_warnings, unpackWARN2(x)) || \
- isWARNf_on(PL_curcop->cop_warnings, unpackWARN3(x)) || \
- isWARNf_on(PL_curcop->cop_warnings, unpackWARN4(x))))
+ (PL_curcop && \
+ !specialWARN(PL_curcop->cop_warnings) && \
+ (isWARNf_on(PL_curcop->cop_warnings, unpackWARN1(x)) || \
+ (unpackWARN2(x) && \
+ (isWARNf_on(PL_curcop->cop_warnings, unpackWARN2(x)) || \
+ (unpackWARN3(x) && \
+ (isWARNf_on(PL_curcop->cop_warnings, unpackWARN3(x)) || \
+ (unpackWARN4(x) && \
+ isWARNf_on(PL_curcop->cop_warnings, unpackWARN4(x)))))))))
/* end of file warnings.h */
EOM
}
while (<DATA>) {
+ last if /^VERSION$/ ;
+ print $pm $_ ;
+}
+
+print $pm qq(our \$VERSION = "$::VERSION";\n);
+
+while (<DATA>) {
last if /^KEYWORDS$/ ;
print $pm $_ ;
}
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" ;
+ '", # [', mkRange(sort { $a <=> $b } @def), "]\n" ;
print $pm tab(6, 'our $LAST_BIT'), '= ' . "$index ;\n" ;
print $pm tab(6, 'our $BYTES'), '= ' . "$warn_size ;\n" ;
while (<DATA>) {
__END__
package warnings;
-our $VERSION = '1.31';
+VERSION
# Verify that we're called correctly so that warnings will work.
+# Can't use Carp, since Carp uses us!
+# String regexps because constant folding = smaller optree = less memory vs regexp literal
# see also strict.pm.
-unless ( __FILE__ =~ /(^|[\/\\])\Q${\__PACKAGE__}\E\.pmc?$/ ) {
- my (undef, $f, $l) = caller;
- die("Incorrect use of pragma '${\__PACKAGE__}' at $f line $l.\n");
-}
+die sprintf "Incorrect use of pragma '%s' at %s line %d.\n", __PACKAGE__, +(caller)[1,2]
+ if __FILE__ !~ ( '(?x) \b '.__PACKAGE__.' \.pmc? \z' )
+ && __FILE__ =~ ( '(?x) \b (?i:'.__PACKAGE__.') \.pmc? \z' );
KEYWORDS
-our $All = "" ; vec($All, $Offsets{'all'}, 2) = 3 ;
-
sub Croaker
{
require Carp; # this initializes %CarpInternal
Carp::croak(@_);
}
+sub _expand_bits {
+ my $bits = shift;
+ my $want_len = ($LAST_BIT + 7) >> 3;
+ my $len = length($bits);
+ if ($len != $want_len) {
+ if ($bits eq "") {
+ $bits = "\x00" x $want_len;
+ } elsif ($len > $want_len) {
+ substr $bits, $want_len, $len-$want_len, "";
+ } else {
+ my $a = vec($bits, $Offsets{all} >> 1, 2);
+ $a |= $a << 2;
+ $a |= $a << 4;
+ $bits .= chr($a) x ($want_len - $len);
+ }
+ }
+ return $bits;
+}
+
sub _bits {
my $mask = shift ;
my $catmask ;
my $fatal = 0 ;
my $no_fatal = 0 ;
+ $mask = _expand_bits($mask);
foreach my $word ( @_ ) {
if ($word eq 'FATAL') {
$fatal = 1;
elsif ($catmask = $Bits{$word}) {
$mask |= $catmask ;
$mask |= $DeadBits{$word} if $fatal ;
- $mask &= ~($DeadBits{$word}|$All) if $no_fatal ;
+ $mask = ~(~$mask | $DeadBits{$word}) if $no_fatal ;
}
else
{ Croaker("Unknown warnings category '$word'")}
{
# called from B::Deparse.pm
push @_, 'all' unless @_ ;
- return _bits(undef, @_) ;
+ return _bits("", @_) ;
}
sub import
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' || $_[0] eq 'NONFATAL' );
+ # append 'all' when implied (empty import list or after a lone
+ # "FATAL" or "NONFATAL")
+ push @_, 'all'
+ if !@_ || (@_==1 && ($_[0] eq 'FATAL' || $_[0] eq 'NONFATAL'));
- # Empty @_ is equivalent to @_ = 'all' ;
- ${^WARNING_BITS} = @_ ? _bits($mask, @_) : $mask | $Bits{all} ;
+ ${^WARNING_BITS} = _bits($mask, @_);
}
sub unimport
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';
+ $mask = _expand_bits($mask);
foreach my $word ( @_ ) {
if ($word eq 'FATAL') {
next;
}
elsif ($catmask = $Bits{$word}) {
- $mask &= ~($catmask | $DeadBits{$word} | $All);
+ $mask = ~(~$mask | $catmask | $DeadBits{$word});
}
else
{ Croaker("Unknown warnings category '$word'")}
my %builtin_type; @builtin_type{qw(SCALAR ARRAY HASH CODE REF GLOB LVALUE Regexp)} = ();
+sub LEVEL () { 8 };
sub MESSAGE () { 4 };
sub FATAL () { 2 };
sub NORMAL () { 1 };
my $isobj = 0 ;
my $wanted = shift;
my $has_message = $wanted & MESSAGE;
-
- unless (@_ == 1 || @_ == ($has_message ? 2 : 0)) {
+ my $has_level = $wanted & LEVEL ;
+
+ if ($has_level) {
+ if (@_ != ($has_message ? 3 : 2)) {
+ my $sub = (caller 1)[3];
+ my $syntax = $has_message
+ ? "category, level, 'message'"
+ : 'category, level';
+ Croaker("Usage: $sub($syntax)");
+ }
+ }
+ elsif (not @_ == 1 || @_ == ($has_message ? 2 : 0)) {
my $sub = (caller 1)[3];
my $syntax = $has_message ? "[category,] 'message'" : '[category]';
Croaker("Usage: $sub($syntax)");
}
$i -= 2 ;
}
+ elsif ($has_level) {
+ $i = 2 + shift;
+ }
else {
$i = _error_loc(); # see where Carp will allocate the error
}
my(@callers_bitmask) = (caller($i))[9] ;
my $callers_bitmask =
@callers_bitmask ? $callers_bitmask[0] // $DEFAULT : 0 ;
+ length($callers_bitmask) > ($offset >> 3) or $offset = $Offsets{all};
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'} + $type - 1, 1));
+ push @results, vec($callers_bitmask, $offset + $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 $wanted == (NORMAL | FATAL | MESSAGE)
+ return if ($wanted & (NORMAL | FATAL | MESSAGE))
+ == (NORMAL | FATAL | MESSAGE)
&& !($results[0] || $results[1]);
+ # If we have an explicit level, bypass Carp.
+ if ($has_level and @callers_bitmask) {
+ # logic copied from util.c:mess_sv
+ my $stuff = " at " . join " line ", (caller $i)[1,2];
+ $stuff .= sprintf ", <%s> %s %d",
+ *${^LAST_FH}{NAME},
+ ($/ eq "\n" ? "line" : "chunk"), $.
+ if $. && ${^LAST_FH};
+ die "$message$stuff.\n" if $results[0];
+ return warn "$message$stuff.\n";
+ }
+
require Carp;
Carp::croak($message) if $results[0];
# will always get here for &warn. will only get here for &warnif if the
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;
+ $Offsets{$name} = $LAST_BIT;
+ $Bits{$name} = _mkMask($LAST_BIT++);
+ $DeadBits{$name} = _mkMask($LAST_BIT++);
+ if (length($Bits{$name}) > length($Bits{all})) {
+ $Bits{all} .= "\x55";
+ $DeadBits{all} .= "\xaa";
}
- $DeadBits{$name} = _mkMask($LAST_BIT);
- vec($DeadBits{'all'}, $LAST_BIT++, 1) = 1;
}
}
}
return __chk(NORMAL | FATAL | MESSAGE, @_);
}
+sub enabled_at_level
+{
+ return __chk(NORMAL | LEVEL, @_);
+}
+
+sub fatal_enabled_at_level
+{
+ return __chk(FATAL | LEVEL, @_);
+}
+
+sub warn_at_level
+{
+ return __chk(FATAL | MESSAGE | LEVEL, @_);
+}
+
+sub warnif_at_level
+{
+ return __chk(NORMAL | FATAL | MESSAGE | LEVEL, @_);
+}
+
# These are not part of any public interface, so we can delete them to save
# space.
-delete @warnings::{qw(NORMAL FATAL MESSAGE)};
+delete @warnings::{qw(NORMAL FATAL MESSAGE LEVEL)};
1;
__END__
+
=head1 NAME
warnings - Perl pragma to control optional warnings
This is the existing flag. If the lexical warnings pragma is B<not>
used in any of you code, or any of the modules that you use, this flag
-will enable warnings everywhere. See L<Backward Compatibility> for
+will enable warnings everywhere. See L</Backward Compatibility> for
details of how this flag interacts with lexical warnings.
=item B<-W>
=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.
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",
- "open is deprecated, use new instead");
+ if (warnings::enabled("deprecated")) {
+ warnings::warn("deprecated",
+ "open is deprecated, use new instead");
+ }
new(@_);
}
=head1 FUNCTIONS
+Note: The functions with names ending in C<_at_level> were added in Perl
+5.28.
+
=over 4
=item use warnings::register
where the object is used.
Otherwise returns FALSE.
+=item warnings::enabled_at_level($category, $level)
+
+Like C<warnings::enabled>, but $level specifies the exact call frame, 0
+being the immediate caller.
+
=item warnings::fatal_enabled()
Return TRUE if the warnings category with the same name as the current
scope where the object is used.
Otherwise returns FALSE.
+=item warnings::fatal_enabled_at_level($category, $level)
+
+Like C<warnings::fatal_enabled>, but $level specifies the exact call frame,
+0 being the immediate caller.
+
=item warnings::warn($message)
Print C<$message> to STDERR.
If that warnings category has been set to "FATAL" in the scope where C<$object>
is first used then die. Otherwise return.
+=item warnings::warn_at_level($category, $level, $message)
+
+Like C<warnings::warn>, but $level specifies the exact call frame,
+0 being the immediate caller.
=item warnings::warnif($message)
if (warnings::enabled($object))
{ warnings::warn($object, $message) }
+=item warnings::warnif_at_level($category, $level, $message)
+
+Like C<warnings::warnif>, but $level specifies the exact call frame,
+0 being the immediate caller.
+
=item warnings::register_categories(@names)
This registers warning categories for the given names and is primarily for
https://perl5.git.perl.org / perl5.git / blobdiff