Preserve scalar slots assigned through localized glob aliases

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@fglock 已经在做这个了。

开始于 2026年11月2日。

  • #1944 来自 @fglock —— 未关闭

评估

难度
4/5
预计耗时
3-5 天
新手友好度
35/100
Issue 类型
缺陷
描述清晰度
描述清楚
活跃度
活跃
技术栈
java, perl
领域
backend

调研方向

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.

由索引模型根据 Issue 内容生成。

描述

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.
主要语言
Perl
星标
65
派生
8
平均合并
6 小时 33 分钟
30 天内合并 PR
178

环境准备

  • 提供 Dockerfile 或 Docker Compose 文件
  • 没有 Pull Request 模板
  • 阅读贡献指南

从这里开始

  1. 先读完整个 Issue，再读项目的贡献指南。
  2. 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
  3. Fork 仓库，在一个分支上完成修改。
  4. 提交 Pull Request，并在描述里引用这个 Issue 编号。

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