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warnings.pl
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warnings.pl
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#!/usr/bin/perl
#
# Regenerate (overwriting only if changed):
#
# lib/warnings.pm
# warnings.h
#
# from information hardcoded into this script (the $tree hash), plus the
# template for warnings.pm in the DATA section.
#
# When changing the number of warnings, t/op/caller.t should change to
# correspond with the value of $BYTES in lib/warnings.pm
#
# With an argument of 'tree', just dump the contents of $tree and exits.
# Also accepts the standard regen_lib -q and -v args.
#
# This script is normally invoked from regen.pl.
$VERSION = '1.52';
BEGIN {
require './regen/regen_lib.pl';
push @INC, './lib';
}
use strict ;
sub DEFAULT_ON () { 1 }
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],
'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, {
'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, {
'experimental::lexical_subs' =>
[ 5.017, DEFAULT_ON ],
'experimental::regex_sets' =>
[ 5.017, DEFAULT_ON ],
'experimental::smartmatch' =>
[ 5.017, DEFAULT_ON ],
'experimental::postderef' =>
[ 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 ],
'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 ],
'experimental::isa' =>
[ 5.031, DEFAULT_ON ],
'experimental::try' =>
[ 5.033, DEFAULT_ON ],
'experimental::trim' =>
[ 5.033, 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 ],
}]};
my @def ;
my %list ;
my %Value ;
my %ValueToName ;
my %NameToValue ;
my %v_list = () ;
sub valueWalk
{
my $tre = shift ;
my @list = () ;
my ($k, $v) ;
foreach $k (sort keys %$tre) {
$v = $tre->{$k};
die "duplicate key $k\n" if defined $list{$k} ;
die "Value associated with key '$k' is not an ARRAY reference"
if !ref $v || ref $v ne 'ARRAY' ;
my ($ver, $rest) = @{ $v } ;
push @{ $v_list{$ver} }, $k;
if (ref $rest)
{ valueWalk ($rest) }
}
}
sub orderValues
{
my $index = 0;
foreach my $ver ( sort { $a <=> $b } keys %v_list ) {
foreach my $name (@{ $v_list{$ver} } ) {
$ValueToName{ $index } = [ uc $name, $ver ] ;
$NameToValue{ uc $name } = $index ++ ;
}
}
return $index ;
}
###########################################################################
sub walk
{
my $tre = shift ;
my @list = () ;
my ($k, $v) ;
foreach $k (sort keys %$tre) {
$v = $tre->{$k};
die "duplicate key $k\n" if defined $list{$k} ;
die "Can't find key '$k'"
if ! defined $NameToValue{uc $k} ;
push @{ $list{$k} }, $NameToValue{uc $k} ;
die "Value associated with key '$k' is not an ARRAY reference"
if !ref $v || ref $v ne 'ARRAY' ;
my ($ver, $rest) = @{ $v } ;
if (ref $rest)
{ push (@{ $list{$k} }, walk ($rest)) }
elsif ($rest == DEFAULT_ON)
{ push @def, $NameToValue{uc $k} }
push @list, @{ $list{$k} } ;
}
return @list ;
}
###########################################################################
sub mkRange
{
my @in = @_ ;
my @out = @in ;
for my $i (1 .. @in - 1) {
$out[$i] = ".."
if $in[$i] == $in[$i - 1] + 1
&& ($i >= @in - 1 || $in[$i] + 1 == $in[$i + 1] );
}
$out[-1] = $in[-1] if $out[-1] eq "..";
my $out = join(",",@out);
$out =~ s/,(\.\.,)+/../g ;
return $out;
}
###########################################################################
sub warningsTree
{
my $tre = shift ;
my $prefix = shift ;
my ($k, $v) ;
my $max = (sort {$a <=> $b} map { length $_ } keys %$tre)[-1] ;
my @keys = sort keys %$tre ;
my $rv = '';
while ($k = shift @keys) {
$v = $tre->{$k};
die "Value associated with key '$k' is not an ARRAY reference"
if !ref $v || ref $v ne 'ARRAY' ;
my $offset ;
if ($tre ne $tree) {
$rv .= $prefix . "|\n" ;
$rv .= $prefix . "+- $k" ;
$offset = ' ' x ($max + 4) ;
}
else {
$rv .= $prefix . "$k" ;
$offset = ' ' x ($max + 1) ;
}
my ($ver, $rest) = @{ $v } ;
if (ref $rest)
{
my $bar = @keys ? "|" : " ";
$rv .= " -" . "-" x ($max - length $k ) . "+\n" ;
$rv .= warningsTree ($rest, $prefix . $bar . $offset )
}
else
{ $rv .= "\n" }
}
return $rv;
}
###########################################################################
sub mkHexOct
{
my ($f, $max, @bits) = @_ ;
my $mask = "\x00" x $max ;
my $string = "" ;
foreach (@bits) {
vec($mask, $_, 1) = 1 ;
}
foreach (unpack("C*", $mask)) {
if ($f eq 'x') {
$string .= '\x' . sprintf("%2.2x", $_)
}
else {
$string .= '\\' . sprintf("%o", $_)
}
}
return $string ;
}
sub mkHex
{
my($max, @bits) = @_;
return mkHexOct("x", $max, @bits);
}
sub mkOct
{
my($max, @bits) = @_;
return mkHexOct("o", $max, @bits);
}
###########################################################################
if (@ARGV && $ARGV[0] eq "tree")
{
print warningsTree($tree, " ") ;
exit ;
}
my ($warn, $pm) = map {
open_new($_, '>', { by => 'regen/warnings.pl' });
} 'warnings.h', 'lib/warnings.pm';
my ($index, $warn_size);
{
# generate warnings.h
print $warn <<'EOM';
#define Perl_Warn_Off_(x) ((x) / 8)
#define Perl_Warn_Bit_(x) (1 << ((x) % 8))
#define PerlWarnIsSet_(a, x) ((a)[Perl_Warn_Off_(x)] & Perl_Warn_Bit_(x))
#define G_WARN_OFF 0 /* $^W == 0 */
#define G_WARN_ON 1 /* -w flag and $^W != 0 */
#define G_WARN_ALL_ON 2 /* -W flag */
#define G_WARN_ALL_OFF 4 /* -X flag */
#define G_WARN_ONCE 8 /* set if 'once' ever enabled */
#define G_WARN_ALL_MASK (G_WARN_ALL_ON|G_WARN_ALL_OFF)
#define pWARN_STD NULL
#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)
/* if PL_warnhook is set to this value, then warnings die */
#define PERL_WARNHOOK_FATAL (&PL_sv_placeholder)
EOM
my $offset = 0 ;
valueWalk ($tree) ;
$index = orderValues();
die <<EOM if $index > 255 ;
Too many warnings categories -- max is 255
rewrite packWARN* & unpackWARN* macros
EOM
walk ($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/:/_/;
$name = "WARN_$name";
print $warn tab(6, "#define $name"), " $k\n" ;
push @names, $name;
$last_ver = $version ;
}
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';
#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) (PerlWarnIsSet_((U8 *)(c + 1), 2*(x)))
#define isWARNf_on(c,x) (PerlWarnIsSet_((U8 *)(c + 1), 2*(x)+1))
#define DUP_WARNINGS(p) Perl_dup_warnings(aTHX_ p)
#define free_and_set_cop_warnings(cmp,w) STMT_START { \
if (!specialWARN((cmp)->cop_warnings)) PerlMemShared_free((cmp)->cop_warnings); \
(cmp)->cop_warnings = w; \
} STMT_END
/*
=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
=for apidoc_item ||ckWARN2|U32 w1|U32 w2
=for apidoc_item ||ckWARN3|U32 w1|U32 w2|U32 w3
=for apidoc_item ||ckWARN4|U32 w1|U32 w2|U32 w3|U32 w4
These return a boolean as to whether or not warnings are enabled for any of
the warning category(ies) parameters: C<w>, C<w1>, ....
Should any of the categories by default be enabled even if not within the
scope of S<C<use warnings>>, instead use the C<L</ckWARN_d>> macros.
The categories must be completely independent, one may not be subclassed from
the other.
=for apidoc Am|bool|ckWARN_d|U32 w
=for apidoc_item ||ckWARN2_d|U32 w1|U32 w2
=for apidoc_item ||ckWARN3_d|U32 w1|U32 w2|U32 w3
=for apidoc_item ||ckWARN4_d|U32 w1|U32 w2|U32 w3|U32 w4
Like C<L</ckWARN>>, but for use if and only if the warning category(ies) is by
default enabled even if not within the scope of S<C<use warnings>>.
=for apidoc Am|U32|packWARN|U32 w1
=for apidoc_item ||packWARN2|U32 w1|U32 w2
=for apidoc_item ||packWARN3|U32 w1|U32 w2|U32 w3
=for apidoc_item ||packWARN4|U32 w1|U32 w2|U32 w3|U32 w4
These macros are used to pack warning categories into a single U32 to pass to
macros and functions that take a warning category parameter. The number of
categories to pack is given by the name, with a corresponding number of
category parameters passed.
=cut
*/
#define ckWARN(w) Perl_ckwarn(aTHX_ packWARN(w))
/* The w1, w2 ... should be independent warnings categories; one shouldn't be
* a subcategory of any other */
#define ckWARN2(w1,w2) Perl_ckwarn(aTHX_ packWARN2(w1,w2))
#define ckWARN3(w1,w2,w3) Perl_ckwarn(aTHX_ packWARN3(w1,w2,w3))
#define ckWARN4(w1,w2,w3,w4) Perl_ckwarn(aTHX_ packWARN4(w1,w2,w3,w4))
#define ckWARN_d(w) Perl_ckwarn_d(aTHX_ packWARN(w))
#define ckWARN2_d(w1,w2) Perl_ckwarn_d(aTHX_ packWARN2(w1,w2))
#define ckWARN3_d(w1,w2,w3) Perl_ckwarn_d(aTHX_ packWARN3(w1,w2,w3))
#define ckWARN4_d(w1,w2,w3,w4) Perl_ckwarn_d(aTHX_ packWARN4(w1,w2,w3,w4))
#define WARNshift 8
#define packWARN(a) (a )
/* The a, b, ... should be independent warnings categories; one shouldn't be
* a subcategory of any other */
#define packWARN2(a,b) ((a) | ((b)<<8) )
#define packWARN3(a,b,c) ((a) | ((b)<<8) | ((c)<<16) )
#define packWARN4(a,b,c,d) ((a) | ((b)<<8) | ((c)<<16) | ((d) <<24))
#define unpackWARN1(x) ((x) & 0xFF)
#define unpackWARN2(x) (((x) >>8) & 0xFF)
#define unpackWARN3(x) (((x) >>16) & 0xFF)
#define unpackWARN4(x) (((x) >>24) & 0xFF)
#define ckDEAD(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)))))))))
EOM
print $warn "\n\n/*\n" ;
print $warn map { "=for apidoc Amnh||$_\n" } @names;
print $warn "\n=cut\n*/\n\n" ;
print $warn "/* end of file warnings.h */\n";
read_only_bottom_close_and_rename($warn);
}
while (<DATA>) {
last if /^VERSION$/ ;
print $pm $_ ;
}
print $pm qq(our \$VERSION = "$::VERSION";\n);
while (<DATA>) {
last if /^KEYWORDS$/ ;
print $pm $_ ;
}
my $last_ver = 0;
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(6, " # Warnings Categories added in Perl $version");
print $pm "\n";
}
print $pm tab(6, " '$name'"), "=> $k,\n" ;
$last_ver = $version;
}
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 $pm tab(6, " '$k'"), '=> "',
mkHex($warn_size, map $_ * 2 , @list),
'", # [', mkRange(@list), "]\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 $pm tab(6, " '$k'"), '=> "',
mkHex($warn_size, map $_ * 2 + 1 , @list),
'", # [', mkRange(@list), "]\n" ;
}
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(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>) {
if ($_ eq "=for warnings.pl tree-goes-here\n") {
print $pm warningsTree($tree, " ");
next;
}
print $pm $_ ;
}
read_only_bottom_close_and_rename($pm);
__END__
package warnings;
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.
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
sub Croaker
{
require Carp; # this initializes %CarpInternal
local $Carp::CarpInternal{'warnings'};
delete $Carp::CarpInternal{'warnings'};
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 $x = vec($bits, $Offsets{all} >> 1, 2);
$x |= $x << 2;
$x |= $x << 4;
$bits .= chr($x) 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;
$no_fatal = 0;
}
elsif ($word eq 'NONFATAL') {
$fatal = 0;
$no_fatal = 1;
}
elsif ($catmask = $Bits{$word}) {
$mask |= $catmask ;
$mask |= $DeadBits{$word} if $fatal ;
$mask = ~(~$mask | $DeadBits{$word}) if $no_fatal ;
}
else
{ Croaker("Unknown warnings category '$word'")}
}
return $mask ;
}
sub bits
{
# called from B::Deparse.pm
push @_, 'all' unless @_ ;
return _bits("", @_) ;
}
sub import
{
my $invocant = shift;
# append 'all' when implied (empty import list or after a lone
# "FATAL" or "NONFATAL")
push @_, 'all'
if !@_ || (@_==1 && ($_[0] eq 'FATAL' || $_[0] eq 'NONFATAL'));
my @fatal = ();
foreach my $warning (@_) {
if($warning =~ /^(NON)?FATAL$/) {
@fatal = ($warning);
} elsif(substr($warning, 0, 1) ne '-') {
my $mask = ${^WARNING_BITS} // ($^W ? $Bits{all} : $DEFAULT) ;
${^WARNING_BITS} = _bits($mask, @fatal, $warning);
} else {
$invocant->unimport(substr($warning, 1));
}
}
}
sub unimport
{
shift;
my $catmask ;
my $mask = ${^WARNING_BITS} // ($^W ? $Bits{all} : $DEFAULT) ;
# 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}) {
$mask = ~(~$mask | $catmask | $DeadBits{$word});
}
else
{ Croaker("Unknown warnings category '$word'")}
}
${^WARNING_BITS} = $mask ;
}
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 };
sub __chk
{
my $category ;
my $offset ;
my $isobj = 0 ;
my $wanted = shift;
my $has_message = $wanted & MESSAGE;
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)");
}
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=/ ;
}
$i -= 2 ;
}
elsif ($has_level) {
$i = 2 + shift;
}
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] // $DEFAULT : 0 ;
length($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);
}
# &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))
== (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 $results[0];
# will always get here for &warn. will only get here for &warnif if the
# category is enabled
Carp::carp($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}) {
$Offsets{$name} = $LAST_BIT;
$Bits{$name} = _mkMask($LAST_BIT++);
$DeadBits{$name} = _mkMask($LAST_BIT++);
if (length($Bits{$name}) > length($Bits{all})) {
$Bits{all} .= "\x55";
$DeadBits{all} .= "\xaa";
}
}
}
}
sub _error_loc {
require Carp;
goto &Carp::short_error_loc; # don't introduce another stack frame
}
sub enabled
{
return __chk(NORMAL, @_);
}
sub fatal_enabled
{
return __chk(FATAL, @_);
}
sub warn
{
return __chk(FATAL | MESSAGE, @_);
}
sub warnif
{
return __chk(NORMAL | FATAL | MESSAGE, @_);
}
sub enabled_at_level
{
return __chk(NORMAL | LEVEL, @_);
}
sub fatal_enabled_at_level
{
return __chk(FATAL | LEVEL, @_);
}
sub warn_at_level
{
return __chk(FATAL | MESSAGE | LEVEL, @_);
}
sub warnif_at_level
{
return __chk(NORMAL | FATAL | MESSAGE | LEVEL, @_);
}
# These are not part of any public interface, so we can delete them to save
# space.
delete @warnings::{qw(NORMAL FATAL MESSAGE LEVEL)};
1;
__END__
=head1 NAME
warnings - Perl pragma to control optional warnings
=head1 SYNOPSIS
use warnings;
no warnings;
use warnings "all";
no warnings "uninitialized";
# or equivalent to those last two ...
use warnings qw(all -uninitialized);
use warnings::register;
if (warnings::enabled()) {
warnings::warn("some warning");
}
if (warnings::enabled("void")) {
warnings::warn("void", "some warning");
}
if (warnings::enabled($object)) {
warnings::warn($object, "some warning");
}
warnings::warnif("some warning");
warnings::warnif("void", "some warning");
warnings::warnif($object, "some warning");
=head1 DESCRIPTION
The C<warnings> pragma gives control over which warnings are enabled in
which parts of a Perl program. It's a more flexible alternative for
both the command line flag B<-w> and the equivalent Perl variable,
C<$^W>.
This pragma works just like the C<strict> pragma.
This means that the scope of the warning pragma is limited to the
enclosing block. It also means that the pragma setting will not
leak across files (via C<use>, C<require> or C<do>). This allows
authors to independently define the degree of warning checks that will
be applied to their module.
By default, optional warnings are disabled, so any legacy code that
doesn't attempt to control the warnings will work unchanged.
All warnings are enabled in a block by either of these:
use warnings;
use warnings 'all';
Similarly all warnings are disabled in a block by either of these:
no warnings;
no warnings 'all';
For example, consider the code below:
use warnings;
my @x;
{
no warnings;
my $y = @x[0];
}
my $z = @x[0];
The code in the enclosing block has warnings enabled, but the inner
block has them disabled. In this case that means the assignment to the
scalar C<$z> will trip the C<"Scalar value @x[0] better written as $x[0]">
warning, but the assignment to the scalar C<$y> will not.
=head2 Default Warnings and Optional Warnings
Before the introduction of lexical warnings, Perl had two classes of
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.
For example, the code below would always produce an C<"isn't numeric">
warning about the "2:".
my $x = "2:" + 3;
With the introduction of lexical warnings, mandatory warnings now become
I<default> warnings. The difference is that although the previously
mandatory warnings are still enabled by default, they can then be
subsequently enabled or disabled with the lexical warning pragma. For
example, in the code below, an C<"isn't numeric"> warning will only
be reported for the C<$x> variable.
my $x = "2:" + 3;
no warnings;
my $y = "2:" + 3;
Note that neither the B<-w> flag or the C<$^W> can be used to
disable/enable default warnings. They are still mandatory in this case.
=head2 "Negative warnings"
As a convenience, you can (as of Perl 5.34) pass arguments to the
C<import()> method both positively and negatively. Negative warnings
are those with a C<-> sign prepended to their names; positive warnings
are anything else. This lets you turn on some warnings and turn off
others in one command. So, assuming that you've already turned on a
bunch of warnings but want to tweak them a bit in some block, you can
do this:
{
use warnings qw(uninitialized -redefine);
...
}
which is equivalent to:
{
use warnings qw(uninitialized);
no warnings qw(redefine);
...