Update perlhack.pod - fix link to mirror git repo #1
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p5p
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Feb 9, 2014
to avoid splain output like this on 80-column terminals: rewinddir() attempted on invalid dirhandle foo at -e line 1 (#1) (W io) The dirhandle you tried to do a rewinddir() on is either closed or no t really a dirhandle. Check your control flow.
p5p
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Sep 19, 2014
to the other part of the message. diagnostics.pm won’t find it otherwise: $ perl -Mdiagnostics -we '"foo"->bar' Can't locate object method "bar" via package "foo" (perhaps you forgot to load "foo"?) at -e line 1 (#1) Uncaught exception from user code: Can't locate object method "bar" via package "foo" (perhaps you forgot to load "foo"?) at -e line 1. Now we have this: Can't locate object method "bar" via package "foo" (perhaps you forgot to load "foo"?) at -e line 1 (#1) (F) You called a method on a class that did not exist, and the method could not be found in UNIVERSAL. This often means that a method requires a package that has not been loaded. Uncaught exception from user code: Can't locate object method "bar" via package "foo" (perhaps you forgot to load "foo"?) at -e line 1.
p5p
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Nov 7, 2014
In the op tree, a statement consists of a nextstate/dbstate op (of
class cop) followed by the contents of the statement. This cop is
created after the statement has been parsed. So if you have nested
statements, the outermost statement has the highest sequence number
(cop_seq). Every sub (including BEGIN blocks) has a sequence number
indicating where it occurs in its containing sub.
So
BEGIN { } #1
# seq 2
{
# seq 1
...
}
is indistinguishable from
# seq 2
{
BEGIN { } #1
# seq 1
...
}
because the sequence number of the BEGIN block is 1 in both examples.
By reserving a sequence number at the start of every block and using
it once the block has finished parsing, we can do this:
BEGIN { } #1
# seq 1
{
# seq 2
...
}
# seq 1
{
BEGIN { } #2
# seq 2
...
}
and now B::Deparse can tell where to put the blocks.
PL_compiling.cop_seq was unused, so this is where I am stashing
the pending sequence number.
p5p
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Jan 13, 2015
to the other part of the message. diagnostics.pm won’t find it otherwise: $ perl -Mdiagnostics -we '"foo"->bar' Can't locate object method "bar" via package "foo" (perhaps you forgot to load "foo"?) at -e line 1 (#1) Uncaught exception from user code: Can't locate object method "bar" via package "foo" (perhaps you forgot to load "foo"?) at -e line 1. Now we have this: Can't locate object method "bar" via package "foo" (perhaps you forgot to load "foo"?) at -e line 1 (#1) (F) You called a method on a class that did not exist, and the method could not be found in UNIVERSAL. This often means that a method requires a package that has not been loaded. Uncaught exception from user code: Can't locate object method "bar" via package "foo" (perhaps you forgot to load "foo"?) at -e line 1. (cherry picked from commit 8af56b9)
p5p
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Mar 2, 2015
8c2e27d changed B::Deparse to deparse $#{1} as that instead of as $#1 which is a syntax error, but also changed $#_ to deparse as $#{_} which isn't necessary, and broke GFUJI/macro-0.06.tar.gz This could be considered a bug in macro.pm, but since we don't need to deparse $#_ as $#{_} let's not do that.
p5p
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Feb 29, 2016
Coverity CID 135025 (#1 of 1): Out-of-bounds read (OVERRUN) 29. overrun-local: Overrunning array addr.sun_path of 108 bytes at byte offset 108 using index addr_len (which evaluates to 108). 864 for (addr_len = 0; addr.sun_path[addr_len] 28. incr: Incrementing addr_len. The value of addr_len may now be up to 108. 865 && addr_len < maxlen; addr_len++); Reported upstream as https://rt.cpan.org/Ticket/Display.html?id=111707
p5p
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Mar 1, 2016
Coverity CID 135025 (#1 of 1): Out-of-bounds read (OVERRUN) 29. overrun-local: Overrunning array addr.sun_path of 108 bytes at byte offset 108 using index addr_len (which evaluates to 108). 864 for (addr_len = 0; addr.sun_path[addr_len] 28. incr: Incrementing addr_len. The value of addr_len may now be up to 108. 865 && addr_len < maxlen; addr_len++); Reported upstream as https://rt.cpan.org/Ticket/Display.html?id=111707
preaction
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Mar 3, 2016
Coverity CID 135025 (Perl#1 of 1): Out-of-bounds read (OVERRUN) 29. overrun-local: Overrunning array addr.sun_path of 108 bytes at byte offset 108 using index addr_len (which evaluates to 108). 864 for (addr_len = 0; addr.sun_path[addr_len] 28. incr: Incrementing addr_len. The value of addr_len may now be up to 108. 865 && addr_len < maxlen; addr_len++); Reported upstream as https://rt.cpan.org/Ticket/Display.html?id=111707
p5p
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Aug 13, 2016
In an eighty-column terminal, this is what it looked like before this commit: $ ./perl -Ilib -Mdiagnostics -E 'state ($x)=1' Initialization of state variables in list context currently forbidden at -e line 1, at EOF Execution of -e aborted due to compilation errors (#1) (F) state only permits initializing a single scalar variable, in scalar context. So state $a = 42 is allowed, but not state ($a) = 42. To apply state semantics to a hash or array, store a hash or array reference in a sca lar variable.
This was referenced Oct 18, 2019
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khwilliamson
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Switch from «use vars» to «our» or «my»
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Change dead link http://github.com/mirrors/perl to https://github.com/Perl/perl5