Preserve scalar slots assigned through localized glob aliases

Aperta
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Dal 2/11/2026.

  • #1944 di @fglock — aperta

Valutazione

Difficoltà
4/5
Tempo stimato
3-5 giorni
Idoneità per principianti
35/100
Tipo di issue
Bug
Chiarezza
Specificata chiaramente
Stato di attività
Attiva
Stack tecnologico
java, perl
Ambito
backend

Direzione di ricerca

Start with the reproducer in the issue: a localized whole-glob alias (local *SYM = *{...}) followed by *SYM = \$value. The issue points to RuntimeGlob.set and getGlobAliasGroup(this.globName) as the place where the scalar slot is written to the wrong glob. Run the snippet on both the JVM and interpreter backends. Done when it prints /tmp/example-state on both, and a permanent regression test covers scalar-slot assignment through a localized glob alias.

Scritto dal modello di indicizzazione a partire dal testo della issue.

Descrizione

area:runtime bug

Summary

PerlOnJava loses the destination scalar slot when a scalar reference is assigned through a localized whole-glob alias. Text::Template 1.61 uses this pattern to expose HASH values to template fragments; those variables become undefined in the template.

Minimal reproducer

use strict;
use warnings;
my $package = 'Probe';
my $name = 'state_dir';
my $value = '/tmp/example-state';
{
    no strict 'refs';
    local *SYM = *{"${package}::$name"};
    *SYM = \$value;
    print defined ${"${package}::$name"}
        ? ${"${package}::$name"} : '<undef>', "\n";
}

System Perl prints /tmp/example-state. PerlOnJava 5.44.1 prints an empty value (with an uninitialized-value warning) on both JVM and interpreter backends.

CPAN evidence

In CPAN random-tester run 20261030-095654-34969, App-Milter-Limit 0.54 fails t/limit-from.t and t/smoke.t on PerlOnJava. Both tests provide a temporary state_dir in their generated config, but Text::Template expands it to an empty string. App-Milter-Limit then applies its /var/run/milter-limit default and fails to create that directory due to permissions.

The archived system-Perl oracle passes the complete App-Milter-Limit suite: 6 test files and 21 tests. The PerlOnJava suite reports 2/6 test programs failed. The relevant environment was macOS 26.7.1 arm64, Java 24.0.2, PerlOnJava 5.44.1 (4dc1a6f4d), and system Perl 5.42.2.

Root cause

Text::Template's _install_hash uses local *SYM = *{"${dest}::$name"} and then assigns *SYM = \$val. PerlOnJava handles the reference assignment in RuntimeGlob.set by updating the scalar slot for getGlobAliasGroup(this.globName). In this localized alias case, the alias group associated with SYM does not carry the destination glob identity, so the destination package scalar remains undefined. The failure is reproducible without Text::Template using the snippet above.

Related, but distinct, reports: #1258 covers direct dynamic package-scalar aliasing; #1630 covered whole-glob aliases and localized IO replacements.

Acceptance criteria

  • The reproducer prints /tmp/example-state on system Perl and both PerlOnJava backends.
  • Add permanent project-owned regression coverage for scalar-slot assignment through a localized whole-glob alias.
  • App-Milter-Limit 0.54 passes all tests on both PerlOnJava backends.
Lingua principale
Perl
Stelle
65
Fork
8
Merge medio
6h 33m
PR unite (30g)
178

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