Autovivify undefined hash reference in list assignment
维护者通常 1 天内回复
已经有一个关联 PR 被合并了。
- #1960 来自 @fglock —— 已合并
评估
调研方向
Start by tracing shared list assignment for a hash dereference in the PerlOnJava runtime, then compare how both the JVM and interpreter backends handle an undefined scalar against an initialized hash reference. Add a focused regression for both cases; done means the reproducer passes on both backends, including the existing initialized-reference behavior.
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描述
Summary
List assignment into a hash dereference does not autovivify an undefined scalar on either PerlOnJava backend. This breaks pure-Perl code that initializes a hash reference with ($self, %$type) = @_ and then reads it.
Reproducer
my ($self, $type);
($self, %$type) = ('Object::Hybrid', reftype => 'HASH', tieable => 0, mutable => 0, caller => 0);
die "missing hash assignment" unless $type->{reftype} eq 'HASH';
System Perl 5.42.2 passes. PerlOnJava at master b43a65250 leaves $type undefined and the key missing on both the JVM and interpreter backends. Initializing $type to {} before the assignment makes both PerlOnJava backends pass.
CPAN evidence
Object-Hybrid 0.07 passed all 909 tests under system Perl. CPAN run 20261103-123832-91742 failed at t/Object-Hybrid.t line 21 after its first assertion, with No 'reftype' parameter specified; the same failure reproduces on both PerlOnJava backends.
Suspected runtime path
The failure is in shared list assignment to a hash dereference. The assignment replaces the pending autovivification hash before the referenced scalar becomes a hash reference. A focused regression should cover the undefined-scalar case and continue to pass when the hash reference is already initialized.
- 主要语言
- Perl
- 星标
- 65
- 派生
- 8
- 平均合并
- 5 小时 57 分钟
- 30 天内合并 PR
- 177
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