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enhancement proposal for caller() #16465

p5pRT opened this issue Mar 14, 2018 · 1 comment

enhancement proposal for caller() #16465

p5pRT opened this issue Mar 14, 2018 · 1 comment


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@p5pRT p5pRT commented Mar 14, 2018

Migrated from (status was 'new')

Searchable as RT132976$

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@p5pRT p5pRT commented Mar 14, 2018


Created by

This is a bug report for perl from Ulrich.Windl@​,
generated with the help of perlbug 1.39 running under perl 5.18.2.

I had the need to find out whether my die handler is receiving messages
from a require or use, so I used caller(). Unfortunately caller() is
less comfortable to use that other Perl functions.
For example when I need to inspect a "slice" of all stack frames, I'll
have to call caller() repeatedly to find out the depth of the call stack,
and then inspect all the lists for the desired elements.

What I'd like to get from caller() is​:
1) The actual depth of the call stack
2) All call frames, not just one
3) A "slice" of a selection of call stacks

Possible implementations could be​:
caller(-1) returns a list with array references to all call frames

Maybe better​:
Add a new callers() that returns all call frames like caller(-1) above.
If given a list of numeric arguments, the result is restricted to the
columns ("slices") given.

So grep { $_->[0] } callers(7) would find all the is_require colums.
Maybe if just one column is requested, the result could be a simple list
instead a list of single-element lists.

callers()[0] would be top or bottom of the call stack, and callers()[-1]
the other end...

I hope you get the idea.

Perl Info


This perlbug was built using Perl 5.18.2 - Fri Nov 24 17:17:29 UTC 2017
It is being executed now by  Perl 5.18.2 - Fri Nov 24 17:15:01 UTC 2017.

Site configuration information for perl 5.18.2:

Configured by abuild at Fri Nov 24 17:15:01 UTC 2017.

Summary of my perl5 (revision 5 version 18 subversion 2) configuration:
    osname=linux, osvers=4.4.92-31-default, archname=x86_64-linux-thread-multi
    uname='linux build70 4.4.92-31-default #1 smp sun oct 22 06:56:24 utc 2017 (1d80e8a) x86_64 x86_64 x86_64 gnulinux '
    config_args='-ds -e -Dprefix=/usr -Dvendorprefix=/usr -Dinstallusrbinperl -Dusethreads -Di_db -Di_dbm -Di_ndbm -Di_gdbm -Dd_dbm_open -Duseshrplib=true -Doptimize=-fmessage-length=0 -grecord-gcc-switches -O2 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector -funwind-tables -fasynchronous-unwind-tables -g -Wall -pipe -Accflags=-DPERL_USE_SAFE_PUTENV -Dotherlibdirs=/usr/lib/perl5/site_perl -Dinc_version_list=5.18.0/x86_64-linux-thread-multi 5.18.0 5.18.1/x86_64-linux-thread-multi 5.18.1'
    hint=recommended, useposix=true, d_sigaction=define
    useithreads=define, usemultiplicity=define
    useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
    use64bitint=define, use64bitall=define, uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
    cc='cc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -DPERL_USE_SAFE_PUTENV -fno-strict-aliasing -pipe -fstack-protector -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
    optimize='-fmessage-length=0 -grecord-gcc-switches -O2 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector -funwind-tables -fasynchronous-unwind-tables -g -Wall -pipe',
    cppflags='-D_REENTRANT -D_GNU_SOURCE -DPERL_USE_SAFE_PUTENV -fno-strict-aliasing -pipe -fstack-protector'
    ccversion='', gccversion='4.8.5', gccosandvers=''
    intsize=4, longsize=8, ptrsize=8, doublesize=8, byteorder=12345678
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16

    ivtype='long', ivsize=8, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
    alignbytes=8, prototype=define
  Linker and Libraries:
    ld='cc', ldflags =' -L/usr/local/lib64 -fstack-protector'
    libpth=/lib64 /usr/lib64 /usr/local/lib64
    libs=-lm -ldl -lcrypt -lpthread
    perllibs=-lm -ldl -lcrypt -lpthread
    libc=/lib64/, so=so, useshrplib=true,
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E -Wl,-rpath,/usr/lib/perl5/5.18.2/x86_64-linux-thread-multi/CORE'
    cccdlflags='-fPIC', lddlflags='-shared -L/usr/local/lib64 -fstack-protector'

Locally applied patches:

@INC for perl 5.18.2:

Environment for perl 5.18.2:
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)

    PERL_BADLANG (unset)

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