Port Devel::Size for PerlOnJava
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評価
調査の方向性
This is a substantial port: reimplement the XS-based Devel::Size as a pure-Perl module plus a Java runtime implementation inside PerlOnJava, following the project's existing module-registration pattern (look at how other bundled CPAN modules are registered). Start by running a minimal use Devel::Size qw(size total_size) to see the lookup failure, then study an existing small module port for the wiring, and adapt upstream 0.87 tests (cycle, shared-reference, export-tag cases) as project-owned tests run on both backends. Done means the acceptance criteria pass on JVM and interpreter backends; this needs real familiarity with the PerlOnJava runtime, so it suits a contributor who already knows the codebase rather than a first-timer.
索引モデルが issue の本文から書いたものです。
説明
Summary
Port Devel::Size for PerlOnJava so CPAN modules that use it as a runtime dependency can load and estimate Perl object sizes on the JVM and interpreter backends.
Devel::Size is currently absent from PerlOnJava's bundled modules. A minimal use fails during module lookup:
use Devel::Size qw(size total_size);
The missing module blocks consumers that declare it as a runtime prerequisite. One concrete consumer observed during CPAN testing is DBG 0.4.1.
Upstream behavior and expected API
The current CPAN release is Devel-Size 0.87, released 2026-03-31. Its Perl wrapper exports size and total_size on request (and via the :all tag), and exposes $Devel::Size::warn and $Devel::Size::dangle controls. The implementation currently loads XS and traverses Perl values, including aggregate/reference structures.
On PerlOnJava, size($value) should return a useful estimate for the value's PerlOnJava representation, and total_size($value) should estimate the reachable structure while counting shared referents once and handling cycles. Estimates should be stable enough for comparisons and diagnostics, but need not match Perl's C allocator byte-for-byte. The module should load without XS and work on both execution backends.
Porting scope
- Add a bundled
Devel::SizePerl module and Java runtime implementation, following the existing PerlOnJava module-registration pattern. - Traverse PerlOnJava runtime values and account for scalars, arrays, hashes, references, code/glob-like values where supported, shared references, and cyclic graphs.
- Preserve the documented exports and warning/dangling-reference controls where applicable; document any deliberate limitations of the Java object model.
- Adapt the upstream tests as project-owned tests, including recursion/cycle and shared-reference cases, and run them on system Perl before relying on them for PerlOnJava behavior.
- Document that these values estimate PerlOnJava-managed object footprints, not process RSS or exact native Perl allocation sizes.
Reverse-dependency estimate
MetaCPAN's reverse-dependency endpoint currently reports 24 distinct distributions mentioning Devel::Size across prerequisite phases. Filtering the latest release metadata to direct runtime requires gives an estimated 22 direct runtime dependants; 6 of those latest releases were updated in the two years before 2026-10-24. These are distribution-level metadata counts, not a count of active users or all transitive consumers. The runtime dependants include diagnostic, profiling, benchmark, GUI, and application distributions.
Sources: MetaCPAN reverse dependencies API and MetaCPAN API documentation.
Acceptance criteria
use Devel::Size qw(size total_size)succeeds without an installed nativeDevel::Sizeon both JVM and interpreter backends.sizeandtotal_sizereturn non-negative numeric estimates for supported values; aggregate size grows as contained data grows.- Shared referents are not counted repeatedly by
total_size, and cyclic structures terminate. - Export/tag behavior and documented controls have focused regression coverage, with unsupported behavior documented.
- The adapted project-owned tests pass with system Perl as an oracle where the semantics are standard Perl behavior, and on both PerlOnJava backends.
Related: #1873 (a separate FileHandle/IO::Seekable porting issue whose CPAN investigation also encountered this missing prerequisite).
- 主要言語
- Perl
- スター
- 65
- フォーク
- 8
- 平均マージ
- 5時間 56分
- マージ済み PR（30日）
- 184
環境構築
- Dockerfile または Docker Compose ファイルあり
- プルリクエストのテンプレートなし
- コントリビューションガイドを読む
はじめの一歩
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