fix: eliminate remaining DBIC-final regressions (op/do.t, op/postfixderef.t, op/tie.t) by fglock · Pull Request #566 · fglock/PerlOnJava

fglock · 2026-04-27T07:15:33Z

Summary

Final DBIC integration on top of master, with all real regressions eliminated while maintaining 100% DBIx::Class test parity.

Test results

Gate	Result
`make` (unit tests)	BUILD SUCCESSFUL
DBIx::Class	314/314 PASS, 13858 subtests, 0 Dubious
Moo	71/71
Template::Toolkit	106/106
`op/do.t`	69/73 (matches master, RT 124248 fixed)
`op/postfixderef.t`	117/128 (matches master, test #40 fixed)
`op/tie.t`	matches master (test #20 fixed)
perl_test_runner `perl5_t/t/op/`	net +1 ok / -1 not_ok = exactly RT 124248, zero new regressions across 43,524 op/ tests

vs PR554 baseline: +347 net passing tests in perl_test_runner.

Changes (steps A-D)

Step A (12bcfb3dc): Whitelist environmental flakes in compare_test_logs.pl (op/stat.t TTY-dependent, win32/seekdir.t, porting/checkcase.t).
Step B (83422dad8): Compile-time bareword check for tie BAREWORD produces matching "Can't modify constant item in tie" error. Fixes op/tie.t test tied variable in void context doesn't call FETCH #20.
Step C (d1c7361ad): Fire DESTROY for blessed local'd arrays/hashes at scope exit. Fixes op/postfixderef.t test Fix declared references support for local and improve reference retur… #40 "no stooges outlast their scope". Implementation in GlobalRuntimeArray.dynamicRestoreState and GlobalRuntimeHash.dynamicRestoreState (with destroyFired guard to prevent double-fire).
Step D (a9615df58): FREETMPS for do-blocks with fresh-result expressions. When the last expression of a do { } block is a "fresh-result" operator (!, not, comparison ops, defined, exists, ref, length, scalar, wantarray, isa, or a literal), the result is guaranteed independent of any inner my-var, so we can safely flush the MortalList at scope exit. Matches Perl 5 SAVETMPS/FREETMPS semantics. Fixes op/do.t test Fix filetest operator stacking and bytecode verification error #70 RT 124248. Conservative whitelist preserves DBIC's do { my $x = ...; $x } patterns where the result IS an inner my-var.

Recovery

Tag dbic-final-good-pre-stepd (at ba8021aed) marks the pre-Step-D safe checkpoint in case Step D causes any issues post-merge:

git reset --hard dbic-final-good-pre-stepd

Plan / investigation notes

See dev/prompts/dbic_final_remaining_regressions_plan.md for full investigation, including the Path 1 attempt that was rejected (introduced 2 new regressions) before the Path 3 (AST whitelist) approach succeeded.

Test plan

make BUILD SUCCESSFUL
./jcpan -t DBIx::Class PASS (314/314)
./jcpan -t Moo PASS (71/71)
./jcpan -t Template PASS (106/106)
op/do.t, op/postfixderef.t, op/tie.t match master baselines
perl_test_runner full op/ suite: zero new regressions (43,524 tests)

Generated with Devin

… of master Flattens 161 commits from the `perf/dbic-safe-port` work branch into a single commit on top of the current master tip. The individual commit history is preserved on the safety branch `backup/perf-dbic-safe-port-pre-flatten` and in the pushed history under refs/heads/perf/dbic-safe-port before this force-push. Port the subset of the `1c79bbc7b` performance work that is safe for DBIx::Class onto the current master, plus the handful of correctness fixes discovered while validating. Drive DBIx::Class to 100 % pass, preserve Moo / Template / bundled-modules parity, stay compatible with the rest of master's changes. ~5.6 Mcells/s (baseline on the pre-perf DBIC-clean master) → ~11.8 Mcells/s after this branch. Exceeds the 11.69 Mcells/s target measured on `1c79bbc7b` (which was DBIC-broken). Four perf phases, all gated on "weak refs exist" so zero-overhead when no weak refs are live in the process: - gate `ScalarRefRegistry.registerRef` on `weakRefsExist` - gate `MyVarCleanupStack.liveCounts` on `weakRefsExist` - gate `MyVarCleanupStack.unregister` emission per-sub - skip `MyVarCleanupStack.register` for simple subs - revert commit `bca73bd5` ("scope-exit LIFO reverse") — it actually produced declaration-order cleanup, breaking `destroy_eval_die.t` test 4. Restored the prior HashMap-iteration behaviour that empirically matches Perl 5's reverse-declaration LIFO for the workloads we run. - `CORE::GLOBAL::require` delete+restore round-trip (`RuntimeStashEntry.set` GLOB branch): mark the destination in `globalGlobs` and install detached-glob slot values directly into `GlobalVariable` maps so the parser's `isGlobAssigned && existsGlobalCodeRef` gate keeps seeing the override after an outer `delete + re-assign` pattern. - `our` alias inheritance into eval STRING: preserve declaring `perlPackage` across `ScopedSymbolTable.snapShot()`, plumb `parentOurPackages` into `BytecodeCompiler` for the interpreter eval path, and honour the symbol entry's `perlPackage` in `compileVariableReference`. Unblocks `DBICTest::Util::OverrideRequire` → `t/53lean_startup.t`. - narrow the stash-alias canonicalisation that arrived via master commit `7f3e0d12d`: leave `bless`/`ref($x)` untouched (broad canonicalisation there produced 29+ DBIC Dubious failures via "detached result source" errors), but linearise both the caller name and its canonical form in `UNIVERSAL::isa` so `$x->isa("alias")` / `$x->isa("canonical")` both succeed regardless of which name `$x` was blessed into. The earlier merge from master brought in upstream DBI 1.647 + DBI::PurePerl, which was fundamentally incompatible with DBIC (PurePerl's `connect` returned handles with `Active = false`, which DBIC rejects — cascaded into ~218 Dubious failures across DBIC). This branch restores the pre-merge purpose-built minimal `DBI.pm` / `DBI.java` and deletes `DBI/PurePerl.pm`. A proper DBI 1.647 migration (which also fixes the PurePerl `Active` bug) is tracked as a follow-up in `dev/design/perf-dbic-safe-port.md` and is NOT part of this PR. - `make dev` removed (it skipped the unit tests, so regressions silently piled up on branches); the `dev` target now errors out pointing at `make`. Master has an equivalent change with more elaborate wording — the merge took master's. - `SKIPPED_MODULE_TESTS` set added to `ModuleTestExecutionTest` as a documented mechanism for skipping bundled-module tests that are false alarms; currently contains only `Net-SSLeay/t/local/01_pod.t` (pod-coverage author test with no Test::Pod::Coverage installed). - `dev/design/perf-dbic-safe-port.md` — full plan + running measurements + step status. - `dev/architecture/weaken-destroy.md` — refreshed status header to the current test counts. - `dev/modules/dbi_test_parity.md` — top-of-file note explaining that the upstream DBI.pm switch was reverted on this branch. | Test suite | Result | |---|---| | `make` | BUILD SUCCESSFUL | | `./jcpan -t Moo` | PASS — Files=71, Tests=841 | | `./jcpan -t Template` | PASS — Files=106, Tests=2935 | | `./jcpan -t DBIx::Class` | PASS — Files=314, Tests=13858, 0 Dubious | | `./jcpan -t JSON` | 67/68 files green; 1 dubious `t/13_limit.t` (recursion/limit test, not introduced here, tracked as follow-up) | | `make test-bundled-modules` | 2 pre-existing failures already tracked (Net-SSLeay/33_x509_create_cert.t Crypt::OpenSSL::Bignum bug; Text-CSV/55_combi.t subtest 26 content) | Individual commit history preserved at `backup/perf-dbic-safe-port-pre-flatten` locally and in the git reflog. See `dev/design/perf-dbic-safe-port.md` for the ordered plan followed during this work. Generated with [Devin](https://cli.devin.ai/docs) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

The bytecode interpreter's `CompileAssignment` only handled the `@hashname{keys} = values` hash slice assignment pattern when `hashOp.operand` was an `IdentifierNode` or an `OperatorNode`. When the parser produces a `BlockNode` wrapper (e.g. `@{$ref}{'a','b'}` or `@{EXPR}{...}`), the interpreter-backend compiler threw: Hash slice assignment requires identifier or reference The JVM backend handles this pattern correctly, so the bug only surfaces when the script falls back to the interpreter — typically for large test files like `perl5_t/t/op/ref.t` where the JVM compiler hits its 65KB method limit. Extended the `OperatorNode` branch to also accept `BlockNode`: both paths compile the operand to a scalar ref and emit the same hash dereference. Same for strict-refs and non-strict paths. ### Impact `perl5_t/t/op/ref.t` now runs 264/265 (same as master) instead of crashing with the above error at compile time (previously 0/0). Generated with [Devin](https://cli.devin.ai/docs) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

@b

`ParseMapGrepSort.parseSort` was flagging the sort comparator with the `isMapGrepBlock` annotation it uses for `map`/`grep` blocks. That flag causes `return` inside the block to be treated as a non-local return and propagated upward through the enclosing sub — appropriate for `map`/`grep` (where `return` really is escaping a pseudo block) but WRONG for `sort`, where the comparator is a proper subroutine. In real Perl: my @b = sort { my $dummy; return $b <=> $a } @A; # works Our jperl died with: `Can't "return" out of a pseudo block`. Dropped the `isMapGrepBlock` annotation from the sort parse path. `parseMapGrep` still sets it — unchanged. ### Impact `perl5_t/t/op/sort.t` now runs 176/206 (was 36/206 after this regression; master was 178/206 — we are back to within normal variance). Generated with [Devin](https://cli.devin.ai/docs) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

`CompileBinaryOperatorHelper.compileBinaryOperatorSwitch` was hard-coding `RuntimeContextType.LIST` as the fourth operand of the `SPLIT` opcode. That's the context in which `Operator.split` is invoked at runtime, and forcing it to LIST meant `$cnt = split(...)` ended up with the last element of the split result as a scalar (via list-to-scalar reduction) instead of the element count. Pass `bytecodeCompiler.currentCallContext` instead, so scalar context returns the count and list context returns the elements — matching the JVM backend. ### Impact `perl5_t/t/op/split.t` now runs 184/219 (was 139/219 after regression; master was 186/219 — within variance). Generated with [Devin](https://cli.devin.ai/docs) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

…lobal The interpreter's `visit(For1Node)` only detected global loop variables via the `node.needsArrayOfAlias` flag (set by the parser for implicit `$_`), leaving `for our $i (...)` to fall through to the local-register path. The iterator then wrote to a temp register that nothing in the body read, and the body's `$i` reference resolved to the uninitialised `$main::i` — so the loop body ran, but the loop variable always looked empty. Detect the `our` wrapper (`OperatorNode("our", OperatorNode("$", IdentifierNode))`) and route it to the same `globalLoopVarName` path used for implicit `$_`: `FOREACH_GLOBAL_NEXT_OR_EXIT` aliases the iterator's element onto the package global each iteration, and `LOCAL_SCALAR_SAVE_LEVEL` / `POP_LOCAL_LEVEL` bracket the loop so the previous value of the `our` is restored on exit. ### Impact `perl5_t/t/op/for.t` now runs 135/149 (was 128/149; master was 141 — 7 of 13 regressions recovered). Generated with [Devin](https://cli.devin.ai/docs) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

…ands `patchLastHashGetForLocal()` scanned raw bytecode backwards looking for any int slot whose value equalled `Opcodes.HASH_GET` (476), `Opcodes.HASH_DEREF_FETCH`, or `Opcodes.HASH_DEREF_FETCH_NONSTRICT`, and flipped that slot to the `_FOR_LOCAL` variant. Bytecode operands (register indices, string-pool indices, jump offsets, ...) share the same int stream as opcodes, so any coincidental match would be silently corrupted. One concrete symptom seen with `use strict; use builtin 'weaken'` processed through the interpreter: a register index happened to equal `HASH_GET` (476); the scan flipped it to `HASH_GET_FOR_LOCAL` (482); at runtime the adjacent HASH_GET dispatched `executeHashGet` with `hashReg=482` and died with "Index 482 out of bounds for length 71". Replaced the backward scan with an explicit PC-tracked rewrite: a new `lastHashGetPc` field is set to `bytecode.size()` right before every `emit(Opcodes.HASH_GET / HASH_DEREF_FETCH / HASH_DEREF_FETCH_NONSTRICT)`, and `patchLastHashGetForLocal()` only rewrites at that exact PC after verifying the value is still the expected opcode. If no PC was recorded (or the opcode value has drifted), the patch is a no-op — `local $array[i]` etc. already exercise this no-op path safely. Generated with [Devin](https://cli.devin.ai/docs) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

…ret operands" This reverts commit 8c69500.

…ring Previously, `undef %hash` deferred DESTROY for every value, emptied the map, then flushed -- so destructors saw an already-empty hash. Perl semantics: each DESTROY invoked during `undef %hash` must see the remaining (not-yet-destroyed) entries via keys/values/each, and may even re-insert entries that should then be destroyed in turn. Test: op/undef.t tests 19-66 (bug 3096), "hash remains consistent during destructor- triggered deletions". Fix: iterate `undefine()` one entry at a time -- remove the entry from the live map first, then defer+flush just that value's DESTROY. Repeat until empty (picking up any entries re-inserted by a destructor). Before: - op/undef.t branch 49 ok / 35 not ok - op/undef.t master 56 ok / 28 not ok After: - op/undef.t branch 87 ok / 1 not ok (also fixes many pre-existing undef.t failures on master) Generated with [Devin](https://cli.devin.ai/docs) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

…dingExists ReachabilityWalker only seeds from globals and ScalarRefRegistry (scalars), so a `my %h` / `my @a` lexical whose only weak reference is `\%h` was always "unreachable" -- the auto-sweep would then clear the weak ref even though the named lexical slot is still very much alive. Fixes op/hashassign.t 218 (perl bug #76716): after my %tb; weaken(my $p = \%tb); is $p, \%tb, "first"; # each `\%tb` in the test harness creates # a mortal ref; the mortal flush triggers # maybeAutoSweep which calls sweepWeakRefs undef %tb; is $p, \%tb, "second"; # $p was zapped by the auto-sweep Guard: in sweepWeakRefs, skip clearing weak refs to a RuntimeHash or RuntimeArray whose localBindingExists is true. The flag is set by createReference() (the path taken by `\%h`/`\@a` on a named lexical) and cleared by scopeExitCleanupHash/Array when the lexical scope ends, so the guard tracks the lifetime of the named slot precisely. Anonymous hash/array refs go through createAnonymousReference() or createReferenceWithTrackedElements() -- neither sets localBindingExists -- so DBIC leak detection (t/52leaks.t) is unaffected. Before: - op/hashassign.t 308 ok / 1 not ok After: - op/hashassign.t 309 ok / 0 not ok Generated with [Devin](https://cli.devin.ai/docs) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

@foo

The interpreter's CREATE_REF opcode handler already called list.createListReference() when the operand register held a RuntimeList, but it skipped the flatten step the JVM backend performs in EmitOperator.handleCreateReference: list.flattenElements().createListReference() Without the flatten, constructs like @foo = \(1..3); # expected: 3 scalar refs @bar = \(@foo); # expected: 3 scalar refs produced a single-element RuntimeList containing a PerlRange / RuntimeArray, so createListReference() iterated once and yielded a single ARRAY ref instead of per-element SCALAR refs. Fix: call flattenElements() before createListReference() inside InlineOpcodeHandler.executeCreateRef, matching the JVM path. op/ref.t 113, 114, 116, 117 all pass under the interpreter fallback now. (Test 115, `\(1,@foo,@bar)`, still fails — both backends incorrectly flatten embedded @arrays instead of taking one array ref per top-level list element; tracked separately.) Generated with [Devin](https://cli.devin.ai/docs) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

Documents 13 remaining ref.t/for.t/sort.t/split.t regressions after three fixes landed today (undef.t progressive DESTROY, weak-ref walker localBindingExists guard, interpreter \(LIST) flatten). Biggest remaining cluster is 7 tests that need interpreter-level alias semantics -- the interpreter's list construction converts RuntimeScalarReadOnly into mutable RuntimeScalar before the foreach iterator, so `for (3) { $_ = 4 }` fails to throw "Modification of a read-only value". The JVM path preserves aliases via RuntimeBase.getArrayOfAlias(); porting that to the interpreter's CREATE_LIST path is a multi-hour refactor, deferred. Generated with [Devin](https://cli.devin.ai/docs) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

@main

…ourReg Standalone statement `local our @pkg;` compiled to: LOAD_GLOBAL_ARRAY r5 = @main::pkg (original global) LOCAL_ARRAY r6 = local @main::pkg ; ourReg=r5 still points at the saved (pre-local) array Then `@pkg = (1,2,3);` resolved `@pkg` to the cached r5 and emitted `ARRAY_SET_FROM_LIST r5`, writing to the ORIGINAL array — the localized (current) @pkg stayed empty. The assign-and-localize path in CompileAssignment.java:178-189 already re-loads the global into ourReg after LOCAL_SCALAR, but only for the `$` case; the `@` and `%` cases (and the statement-form `local our VAR`) were missing the reload. Fix: after LOCAL_SCALAR / LOCAL_ARRAY / LOCAL_HASH in the statement-form path (BytecodeCompiler.java:3725), emit a fresh LOAD_GLOBAL_* into ourReg so subsequent reads/writes through the `our`-bound variable see the current (localized) container. Before: - op/split.t 184 ok / 35 not ok After: - op/split.t 186 ok / 33 not ok (matches master; fixes 164, 166) Generated with [Devin](https://cli.devin.ai/docs) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

`local(*foo) = *bar` — a parenthesized 1-element list where the element is a glob — fell through the handleLocalListAssignment fast-path (which only matched `$` and binary-op lvalues) into the main loop (which only matched `$` and binary-op again), so NOTHING was emitted for the glob element. The assignment was a silent no-op. Add the `*` case to the 1-element fast path, emitting LOCAL_GLOB + STORE_GLOB (the same sequence used by the non-parenthesized form `local *foo = *bar` in handleLocalAssignment). Fixes op/ref.t 1 (interpreter fallback). Generated with [Devin](https://cli.devin.ai/docs) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

@foo

After five fixes (undef.t progressive DESTROY, weak-ref walker guard, \(LIST) flatten, `local our VAR` re-load, `local(*foo) = *bar` list- assign), the remaining regression count drops from 26 to 12: - 7: for-loop readonly aliasing (ref.t 231-234, for.t 130-134) — needs new ReadOnlyAlias wrapper class to intercept mutation on foreach iterator elements without the existing isImmutableProxy strip path unboxing it. - 2: sort.t 169, 172 — DESTROY counter context-specific, not reproducible in isolation. - 2: for.t 103, 105 — do{foreach}, foreach-over-undef-slot, likely related to cluster A. - 1: ref.t 115 — `\(1, @foo, @bar)` distributive flatten rule (both backends flatten embedded arrays when Perl only flattens a lone `(@arr)`). All 12 remaining regressions are in tests that fall back to the bytecode interpreter because of JVM method-too-large; fixing them requires interpreter-level work or bytecode-size reduction. Generated with [Devin](https://cli.devin.ai/docs) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

…ntext `for (3) { ++$_ }` / `for my $i (3, undef, "abc") { $i = 4 }` in the bytecode interpreter silently succeeded where real Perl throws "Modification of a read-only value attempted". The JVM backend already handles this correctly via `RuntimeBase.getArrayOfAlias()` preserving whatever read-only markers the list elements carry. Three coordinated changes: 1. **LIST-context literal emission** — BytecodeCompiler.visit(NumberNode) and visit(StringNode), plus CompileOperator "undef": in LIST context, emit `LOAD_CONST` of the cached `RuntimeScalarReadOnly` from `RuntimeScalarCache.getScalarInt/getScalarString/…` instead of `LOAD_INT` / `LOAD_STRING` / `LOAD_UNDEF` (which create fresh mutable `RuntimeScalar`). Only in LIST context — SCALAR-context literals (e.g. `my $x = 3`) still get a mutable because `MY_SCALAR` / `ALIAS` copy the value anyway, and downstream `++$x` needs mutable storage. 2. **FOREACH dispatchers preserve read-only** — BytecodeInterpreter `FOREACH_NEXT_OR_EXIT` and `FOREACH_GLOBAL_NEXT_OR_EXIT`: iterate elements verbatim. Previously `isImmutableProxy` check unboxed `RuntimeScalarReadOnly` into a mutable copy before storing into the loop-variable register, defeating the alias. `ScalarSpecialVariable` ($&, $1, …) is still unboxed for compatibility with the surrounding interpreter paths that don't propagate alias state. 3. **Increment/decrement don't strip read-only** — OpcodeHandlerExtended `executePre/PostAutoIncrement/Decrement`: call `preAutoIncrement()` etc. on the register value as-is, so `RuntimeScalarReadOnly.vivify()` throws. Still strip `ScalarSpecialVariable` for the same reason as above. These three changes are interdependent: (1) makes the read-only arrive into the iterator; (2) preserves it through the loop-variable register; (3) makes the mutation attempt throw instead of silently unboxing. Results: - op/ref.t 240 → 242 ok (fixes 231, 233) - op/for.t 135 → 140 ok (fixes 105, 130, 131, 133, 134) - Still failing: op/ref.t 232, 234 (`${\$_} = 4` refgen path); op/for.t 103 (`do { foreach }` in scalar context); op/sort.t 169, 172 (DESTROY counting, test-context specific). Generated with [Devin](https://cli.devin.ai/docs) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

… path Follow-up to "preserve read-only aliasing for literals in LIST context". The SET_SCALAR opcode handler was silently stripping RuntimeScalarReadOnly into a fresh mutable, defeating tests like for (3) { ${\$_} = 4 } # op/ref.t 232, 234 where the `${\$_}` refgen/deref round-trip lands the literal read-only scalar into SET_SCALAR's destination register. Stripping there made the assignment silently succeed. Change: only strip ScalarSpecialVariable ($&, $1, …), matching the narrower strip policy already adopted in FOREACH_NEXT_OR_EXIT and executePre/PostAutoIncrement/Decrement. RuntimeScalarReadOnly falls through to `addToScalar(scalar)` → `scalar.set(rhs)` → `.vivify()` → "Modification of a read-only value". Results: - op/ref.t 242 → 244 ok (now EXCEEDS master's 243) - Regression count on this branch vs master: 5 → 3 (only op/for.t 103, op/sort.t 169, 172 remain) Generated with [Devin](https://cli.devin.ai/docs) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

Two commits in the final session landed the biggest remaining clusters: - `91285924b` (literal LIST-context read-only) fixed op/ref.t 231, 233 and op/for.t 105, 130, 131, 133, 134 — 7 regressions. - `0258c7f4b` (SET_SCALAR read-only) fixed op/ref.t 232, 234 via the refgen/deref path — 2 more. Only 3 regressions remain, all of which pass in isolated `--interpreter` runs and only reproduce inside the full test harness (suggesting interactions with surrounding test state rather than architectural gaps): - op/for.t 103 — `do { foreach(…) { … } }` value in scalar context - op/sort.t 169, 172 — Counter DESTROY counter during sort Also: - op/ref.t 244/265 ok — now EXCEEDS master (243) - op/undef.t 87/88 ok — 31 more passing than master (56) Generated with [Devin](https://cli.devin.ai/docs) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

… aliasing The previous fix removed the read-only-strip from PRE/POST_AUTOINCREMENT and SET_SCALAR opcode handlers so that `for (3) { ++$_ }` would throw "Modification of a read-only value". That broke `$#_++` on an empty array, where MathOperators.subtract returns the cached `RuntimeScalarCache.getScalarInt(-1)` (a real RuntimeScalarReadOnly that the surrounding bytecode legitimately needs to silently copy). New approach: introduce `ReadOnlyAlias`, a RuntimeScalar subclass that overrides `set/preAuto*/postAuto*/undefine/chop/chomp` to throw "Modification of a read-only value", but is NOT a `RuntimeScalarReadOnly` (so `BytecodeInterpreter.isImmutableProxy` returns false and the defensive strip in mutating opcodes leaves it alone). In FOREACH_NEXT_OR_EXIT and FOREACH_GLOBAL_NEXT_OR_EXIT, wrap iterator elements that are `RuntimeScalarReadOnly` (i.e., literal rvalues from `for (3, "abc", undef) {…}`) in `ReadOnlyAlias`. The cached read-only itself is unchanged — the wrapper points at it via shared `type`+`value` fields, so reads work, and writes throw because `ReadOnlyAlias.set` throws. Revert the broad PRE/POST_AUTOINCREMENT/DECREMENT and SET_SCALAR strip changes — they no longer need to know about the foreach case. Also: `RuntimeGlob.set` checks `instanceof RuntimeScalarReadOnly` to decide whether to replace the GvSV slot vs mutate in-place. Extend that check to recognise `ReadOnlyAlias` as well, otherwise `*foo = "x"` on a glob whose current slot is a foreach-aliased literal throws instead of replacing. Result: - op/for.t 139 ok / 149 (master 141; remaining regressions: 103, 105) - op/ref.t 244 ok / 265 (master 243; exceeds master) - `$#_++` works again, `for (3) { ++\$_ }` still throws. Generated with [Devin](https://cli.devin.ai/docs) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

Updates the regression report with the latest test-comparison numbers after the ReadOnlyAlias-wrapper fix landed: - 5 "regressed" files in the harness comparison are all false positives or non-deterministic count differences. Direct runs of comp/term.t, op/quotemeta.t, op/stat.t all produce identical ok/ not_ok counts on master and branch. - The 80 tests reported missing from win32/seekdir.t and porting/checkcase.t come from total-count differences (both files pass 100% in both runs). - Remaining small deltas across ~14 files (op/grep.t, op/decl-refs.t, op/inccode*, op/postfixderef.t, comp/require.t, …) are real but individually small and in distinct subsystems; documented for follow-up. Branch achievements: - exceeds master on op/ref.t (+1), op/undef.t (+31), op/goto-sub.t (+3), op/gv.t (+231) - net +151 passing tests across the full perl5_t/t/ suite - delivers perf + refcount-tracking infrastructure intended by PR Generated with [Devin](https://cli.devin.ai/docs) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

…ted reads Previous version of ReadOnlyAlias was a plain RuntimeScalar subclass that overrode mutating methods (set, ++, --) to throw. That broke op/bop.t (-285), op/split.t (-85), op/quotemeta.t (-2), comp/term.t (-2), and dozens of other tests because so many code paths check `instanceof RuntimeScalarReadOnly` to decide: 1. utf8::upgrade/downgrade -- skip in-place mutation, return success 2. Internals::SvREADONLY -- report read-only-ness 3. RuntimeGlob.set -- replace GvSV slot vs mutate in place 4. Autovivification (RuntimeScalar.arrayDeref/hashDeref/arrayDerefGet) 5. RuntimeList placeholder detection for `(undef, ...)` LHS 6. ScalarUtil::readonly builtin When ReadOnlyAlias wasn't a RuntimeScalarReadOnly, all those checks fell through to the mutating path, which then called .set() on the ReadOnlyAlias and threw -- aborting test files mid-run. New design: ReadOnlyAlias extends RuntimeScalarReadOnly so all those sites treat it correctly. Two complications resolved: 1. RuntimeScalarReadOnly's `b` and `s` fields are final and the parent default constructor sets them to `false`/`""`. The ReadOnlyAlias ctor cannot reassign them. Solution: store the wrapped `src` scalar and override `toString()`, `getBoolean()`, `getInt()`, `getLong()`, `getDouble()` to delegate to it. Reads see the correct value; the inherited `vivify()` still throws for writes. 2. The interpreter's `isImmutableProxy()` strips RuntimeScalarReadOnly into a mutable copy at every ALIAS, SET_SCALAR, and PRE/POST_AUTOINCREMENT/DECREMENT opcode -- which would defeat foreach literal-aliasing. Solution: explicit instanceof exclusion in BytecodeInterpreter.isImmutableProxy and InlineOpcodeHandler.isImmutableProxy. ReadOnlyAlias slips through the strip path so mutations reach `vivify()` and throw. Test results: - op/bop.t 215 -> 500 ok / 522 (master 500) +285 - op/split.t 101 -> 186 ok / 219 (master 186) +85 - op/ref.t 244 ok / 265 (exceeds master 243) +1 - op/for.t 139 ok / 149 (master 141) -2 - foreach `for (3) { ++$_ }` still throws correctly - foreach `for ("x", "y") { utf8::upgrade($_) ... }` no longer crashes Generated with [Devin](https://cli.devin.ai/docs) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

After the ReadOnlyAlias refinement (extends RuntimeScalarReadOnly with delegated read methods), the branch's net improvement vs master is: - +327 passing tests across 19 files - -74 passing tests across 17 files (32 pseudo-regressions from test-count variability + 50 real regressions) - **Net +253 passing tests** Real regressions cluster into: - 20 refcount-precision (perf-design tradeoff: branch increfs container stores; tests that probe exact DESTROY timing differ) - 12 declared references (op/decl-refs.t multi-element list returns) - 7 module loading (comp/require.t $INC tracking) - ~11 misc one-offs across op/lex_assign.t, op/sort.t, op/for.t, op/do.t, op/recurse.t, op/stat.t, op/tie.t, test_pl/examples.t Generated with [Devin](https://cli.devin.ai/docs) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

`[ bless [], 'A', bless [], 'B' ]` and `( bless [], 'A', bless [], 'B' )` were destroying element A while constructing element B because the inner `[]` of B's bless emitted suppressFlush+flush envelope, and the closing flush() drained the *entire* mortal pending list -- including A's mortal entry from the outer construction. A had refCount=1 (from bless's mortalize) and was waiting in `pending`. The inner `[]` flush decremented to 0 -> DESTROY, even though A was still strongly held by the outer list literal we were building. Fix: anonymous array literal `[...]` now wraps its body with `pushMark`+`suppressFlush(true)` and ends with `popAndFlush()` instead of `flush()`. popAndFlush only processes pending entries added since the mark, leaving outer-scope entries (like A's bless mortal) alone to be drained at the proper outer flush boundary. Test results: - op/grep.t 71 -> 74 ok / 77 (matches master) +3 - op/sort.t 176 -> 178 ok / 206 (matches master) +2 Five tests recovered. Generated with [Devin](https://cli.devin.ai/docs) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

@A

…-element Perl's distributive `\(LIST)` rule: \(@A) → (\$a[0], \$a[1], …) (flatten the lone array) \(@A, @b) → (\@A, \@b) (no flatten) \(1, @A) → (\1, \@A) (no flatten) \my (\@f, @g) → (\\@f, \@g) (no flatten of @g) We always called RuntimeList.flattenElements() before RuntimeList.createListReference(), which expanded embedded arrays/hashes even when the list had multiple top-level items. That gave wrong results for multi-element lists in op/ref.t test 115 and op/decl-refs.t (12 tests covering my/state/our/local × @/% with declared-refs). Fix: introduce RuntimeList.flattenForRefgen() that only flattens when the list has exactly one element AND that element is a RuntimeArray / RuntimeHash / PerlRange. Otherwise return self (per-element refs become refs of top-level items). Both backends updated: - JVM: EmitOperator.handleCreateReference uses flattenForRefgen - Interp: InlineOpcodeHandler.executeCreateRef uses flattenForRefgen Test results: op/decl-refs.t 334 -> 346 ok (matches master) +12 op/ref.t 244 ok (test 115 now correct, still +1 over master) Generated with [Devin](https://cli.devin.ai/docs) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

Two issues caused comp/require.t -7 vs master: 1. doFile()'s catch block REMOVED the %INC entry on compilation failure. Perl 5's documented behaviour is to leave the entry as undef, marking the file as "already attempted, failed". Tests 24, 27-33 in comp/require.t check `exists $INC{$file}` after a failed require. 2. require()'s post-doFile error path (line 909) also removed the entry "to allow XS-to-pure-Perl fallback". This duplicated the bug for the same file's catch path. 3. The cached-failure short-circuit threw "Can't locate ... (compilation previously failed)" but Perl 5 reports "Attempt to reload <file> aborted.\nCompilation failed in require". Test 32 "Compilation failed" checks `$@ =~ /Compilation failed/i`. Fix: doFile catch sets `$INC{$fileName} = undef`. require()'s post- doFile branch only sets if not already set. Cached-failure path now throws the Perl 5-compatible "Attempt to reload ..." message. Result: comp/require.t 1736 -> 1743 ok (matches master) +7 Generated with [Devin](https://cli.devin.ai/docs) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

…hrow `chop "literal"` / `chomp "literal"` (a literal in argument position) threw "Modification of a read-only value attempted" via the inherited RuntimeBaseProxy.chop/chomp -> vivify path. Real Perl raises this as a compile-time "Can't modify constant item in chop" error; our compiler doesn't catch this case, so we used to allow the runtime call which then attempted to modify the literal. Override RuntimeScalarReadOnly.chop / chomp to: - chop: return a fresh scalar containing the last character (or "") without modifying the original - chomp: return 0 (the count of newlines removed - none, since we don't modify) This matches the no-op behaviour observable on master, where the compile-time error never fires and the runtime silently lets the operation slide. Test results: op/lex_assign.t 351 -> 353 ok (matches master) +2 op/inccode.t 68 -> 70 ok (test 66 unrelated FETCH count) op/inccode-tie.t 72 -> 74 ok op/for.t 139 -> 141 ok (test 103 do{foreach} value) -- multiple downstream tests recover because chop/chomp on read-only scalars no longer aborts evals mid-run. Generated with [Devin](https://cli.devin.ai/docs) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

After 13 fix commits, branch matches master on every previously- regressed test file in direct testing. The 5 remaining files in the harness comparison report (porting/checkcase.t, win32/seekdir.t, comp/term.t, op/quotemeta.t, op/stat.t) all show identical pass rates when each test is run directly -- the count drift is from non-deterministic test-harness timing, not actual code differences. Branch achievements: - op/gv.t +231 (new modules-as-globs work) - re/overload.t +36 - op/undef.t +31 (progressive DESTROY) - op/decl-refs.t +12 (refgen distributive rule) - comp/require.t +7 (%INC preservation) - op/bop.t (matches master after foreach readonly + list flush) - ... and many smaller wins - net +199 passing tests across full perl5_t/t/ PR #552 ready for merge review. Generated with [Devin](https://cli.devin.ai/docs) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

Reverts the EmitLiteral.java change from commit 3fe1669 ("fix(jvm): array-literal closing flush is scope-bound (popAndFlush)"). That change wrapped `[ ... ]` body with pushMark+suppressFlush+popAndFlush to fix tests like op/sort.t 169/172 by preventing the closing flush from draining sibling mortals. But it caused DBIC Schema to be GC'd prematurely later — t/64db.t and ~98 other DBIC tests regressed with "Schema GCed" / "no such table" errors. Trade-off: 4-5 perl5_t tests (op/sort.t 169/172, op/postfixderef.t "no stooges outlast scope", op/grep.t "pre" subtests, op/inccode*.t, op/for-many.t) revert to their pre-fix state in exchange for DBIC parity. DBIC was the branch's primary objective. Bisect confirmation: - 3fe1669~1 (479765f): t/64db.t 4/4 PASS - 3fe1669: t/64db.t 1/4 (Schema GCed) - HEAD with revert: t/64db.t 4/4 PASS, dbic_fast_check 8/8 PASS Future work: a correct mark-based scheme should pop the mark on exit AND merge remaining above-mark entries back below mark (so the outer scope can still process them at its own flush). The current popAndFlush removes the entries, leaving outer-scope mortals undrained. Generated with [Devin](https://cli.devin.ai/docs) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

Two related issues caused orphan JVMs to spin at 99% CPU for hours after the test harness gave up on a slow DBIC test: 1. `./jperl` ran `java ...` without `exec`. The bash wrapper stayed as parent of the JVM, so when prove's `kill 9 $pid` fired (pid was the bash wrapper), bash died but JVM continued orphaned. 2. TAP::Parser::Iterator::Process killed only `$self->{pid}`, not the process group. With (1) fixed, kill goes to the JVM directly, but the process-group kill provides defence-in-depth for any other Perl/shell wrapper that might forget to exec. After the fix, `kill 9 -$pid` reaps the entire process tree (wrapper + JVM + any children) on timeout. Symptoms cured: - `t/96_is_deteministic_value.t`, `t/cdbi/68-inflate_has_a.t`, `t/debug/core.t` were each spawning JVMs that ran for 1-2.5 hours at 99% CPU after the harness emitted "# Test timed out after 300s". Each test passes in 5-7s standalone — they were just CPU-starved under parallel load and the unkillable orphans accumulated. - `jstack` on the orphans showed a hot loop in Sub::Defer, but that was a phantom: the orphan JVM was running with a closed stdout pipe (from the dead bash parent) and DBIC's leak-checker `print` calls during END/DESTROY were retrying silently in some PerlOnJava code path. With proper kill, the process dies before reaching that code. Generated with [Devin](https://cli.devin.ai/docs) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

… values Commit 48ebef3 made `RuntimeHash.undefine()` a per-entry loop that calls `MortalList.flush()` once per element to give blessed destructors a view of the not-yet-destroyed remaining entries (op/undef.t 19-35, bug 3096). That was a correctness fix. The cost: for a hash with N entries, we paid N flushes — even when no value could ever fire a DESTROY. Each flush: - iterates the entire `pending` list - calls `System.nanoTime()` for the auto-sweep guard - can trigger a full ReachabilityWalker sweep (every 5 s) Most DBIC hashes hold plain scalars (SQL strings, ints, undef) or unblessed structures — none of which need the slow path. Under parallel-load DBIC runs, the cumulative O(N) flush cost was the most visible source of test-time slowdown. Fix: scan once for any blessed value. If none, take the original one-shot path: `deferDestroyForContainerClear(values)` + `clear()` + single `flush()`. Verification: - op/undef.t: 87/88 (unchanged — test 18 was already failing pre-fix; tests 19-35 still take the slow path because they bless the values). - t/96, t/cdbi/68, t/debug/core: pass standalone in 4-7 s (unchanged). - `make`: BUILD SUCCESSFUL. Generated with [Devin](https://cli.devin.ai/docs) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

Restores the canonicalisation removed by base commit 4329ccd, which had narrowed `7f3e0d12d` ("bless / isa canonicalise through stash aliases") to avoid DBIC "detached result source" errors. With the lifetime fixes accumulated on this branch — popAndFlush revert (908c474), harness exec/process-group kill (7af5af5), and RuntimeHash.undefine() fast path (98e1fe7) — the underlying weak-ref/refcount issues that produced the detached-source errors are resolved. Re-running `./jcpan -t DBIx::Class` after the change shows: Files=314, Tests=13858, Result: PASS (0 Dubious) 1499 wallclock secs Same pass rate as base, exact match with master tip's behavioural expectations. Verification: - src/test/resources/unit/stash_aliasing.t: 6/6 (was 5/6 — the "bless through aliased package name" subtest now passes). - op/bless.t in perl5_t/t: 111/118 (was 109/118 — +2 from canonicalisation). - ./jcpan -t Moo: 71/71 PASS. - ./jcpan -t Template: 106/106 PASS. - ./jcpan -t DBIx::Class: 314/314 PASS, 0 Dubious. - make: BUILD SUCCESSFUL. Generated with [Devin](https://cli.devin.ai/docs) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

Removes the spurious `MortalList.flush()` at the end of `[ ... ]` construction and lets the existing statement-boundary `flushAboveMark()` (emitted by EmitBlock per Perl's nextstate FREETMPS) handle drainage at the right time. ## Background `[ A, B, C ]` previously did: suppressFlush(true) ... build body ... createReferenceWithTrackedElements # increfs elements suppressFlush restore flush() # <-- WRONG That closing `flush()` drained the entire `pending` list — including mortals from the outer scope that should survive to the statement end. Two failure modes: 1. **DBIC**: in `bless { ... }, "Schema"` chained with a `[ ... ]` expression, schema's mortal entry got drained mid-statement → schema GC'd while still in use → "no such table: artist" cascade. 2. **sort/grep leak tests**: a sibling `[ ... ]` flushing the entire pending list dropped temporaries from `sort {} LIST` / `grep {} LIST` that should have lived to statement end. A previous attempt (commit 3fe1669, since reverted) used `pushMark`+`popAndFlush` to scope the drain. That removed above-mark entries from `pending`, which caused DBIC's schema mortal to be "lost" before statement-end, breaking it differently. ## Fix Remove the closing `flush()` entirely. Perl's model is: - SAVETMPS at block entry (PerlOnJava: function-entry pushMark) - FREETMPS at every statement boundary AND block exit - Mortals from sub-expressions stay alive until the enclosing statement ends PerlOnJava already has the right machinery: - `EmitBlock` emits `MortalList.flushAboveMark()` after each statement (matches Perl's nextstate FREETMPS). - `emitScopeExitNullStores(flush=true)` does pushMark+popAndFlush around block-exit cleanup (matches Perl's block FREETMPS). The per-`[...]` `flush()` was just redundant — and wrong. ## Verification - `make`: BUILD SUCCESSFUL. - `./jcpan -t DBIx::Class`: Files=314, Tests=13858, Result: PASS, 0 Dubious. Same as base + same as previous PR560. - perl_test_runner vs previous PR560: - op/grep.t +3 (recovered to PR554 level: 74/77) - op/sort.t +2 (recovered to PR554 level: 178/206) - re/pat_advanced.t -2 (1336→1334; minor regression — different mortal timing in regex captures) - op/ref.t -1 (244→243; minor) - Net: +2 - vs PR554: net +334 passing tests across the suite. Generated with [Devin](https://cli.devin.ai/docs) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

@arr

Two related refcount fixes that recover Categories B and C from dev/prompts/dbic_final_postfix_for_inccode_plan.md without breaking DBIC, Moo, or Template. ## Fix 1: Internals::SvREFCNT includes localBindingExists `Internals::SvREFCNT(\@arr)` previously returned only the raw `refCount` value, which counts external refs (RVs, container slots) but excludes the lexical pad slot. Real Perl's SvREFCNT includes the pad slot — so a `my @arr` with no other refs reports SvREFCNT=1 (pad ownership), not 0. Add `+1` when `localBindingExists` is true. The `rc==0 && extra==0` guard preserves the legacy "fudge to 1 for live SVs with no owner" convention for anonymous tracked objects. Recovers `op/for-many.t` from 70/81 → 72/81 (matches master). ## Fix 2: list-assignment undef placeholder undoes copy incref `my (undef, $name) = @_;` patterns leaked +1 refCount per call on the discarded first arg, visible in `op/inccode.t` "no leaks" tests #61, #63 (perl bug #92252). Root cause: `RuntimeList.setFromList` materializes the RHS once into a flat array (`addToArray` → `addToScalar` → `set` → `setLarge`), which increments the referent's refCount on each ref-typed copy. The branch that handles assigned scalars already undoes this increment before discarding the copy. The `undef` placeholder branch was missing the corresponding undo. Mirrors the existing fix from the assigned-scalar branch. Recovers `op/inccode.t` 68/75 → 70/75 (matches master) and `op/inccode-tie.t` 72/75 → 74/75 (matches master). ## Verification - `make`: BUILD SUCCESSFUL. - DBIC fast check: 8/8 PASS (same as before). - Test counts: | file | before | after | master target | |---|---|---|---| | op/for-many.t | 70/81 | 72/81 | 72 | | op/inccode.t | 68/75 | 70/75 | 70 | | op/inccode-tie.t | 72/75 | 74/75 | 74 | Categories A (postfixderef.t #38 eval-string DESTROY) and D (for.t #103 do-block return + #105 undef element) remain — separate commits. Generated with [Devin](https://cli.devin.ai/docs) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

`op/recurse.t` line 110 calls `sillysum(1000)`, a 1000-deep recursion. PerlOnJava maps each Perl call to a JVM frame, so the JVM default stack (~512 KB on macOS) overflows around frame 1000. Standalone the test passes 28/28 (default JPERL_OPTS empty under shell). Under `perl_test_runner.pl --jobs 8` it lost tests 26-28 to StackOverflowError because recurse.t was missing from the runner's existing -Xss256m whitelist (which already covers re/pat.t, op/repeat.t, op/list.t). Saved test output prior to fix: ok 25 - premature FREETMPS (change 5699) # Looks like you planned 28 tests but ran 25. StackOverflowError main at op/recurse.t line 110 ... (deep stack) Verified after fix: 5 consecutive runs each report 28/28 ok. Recovers `op/recurse.t` from 25/28 → 28/28 (matches master at 26/28 or better depending on parallel timing — flake eliminated). Plan reference: dev/prompts/dbic_final_remaining_regressions_plan.md Step 6. Generated with [Devin](https://cli.devin.ai/docs) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

@A

`&Internals::SvREFCNT($x)` for an anonymous container-ref now reports `refCount + lex_extra - 1` (the "-1" discounts the function arg itself, which is one of the counted owners). Matches real Perl: my @A; &SvREFCNT(\@A) => 1 (just lex pad) $r=\@A; &SvREFCNT(\@A) => 2 (lex + $r) my $x = []; &SvREFCNT($x) => 0 (1 owner, reports owner-1) $r=$x; &SvREFCNT($x) => 1 (2 owners, reports owner-1) Before this commit, anonymous-container queries reported `refCount + lex_extra` (no -1), so `my $x=[]; &SvREFCNT($x)` returned 1 instead of 0, and the "two references" check after `my $r = $x` returned 2 instead of 1. Recovers `test_pl/examples.t` from 10/17 → 12/17 (master is 11/17 — the fix also unsticks one master-failing test). Verification: - `make`: BUILD SUCCESSFUL. - DBIC fast check: 8/8 PASS. - Categories B+C unchanged: for-many.t 72, inccode.t 70, inccode-tie.t 74. - DBIC code never reads Internals::SvREFCNT — diagnostic API only. Plan reference: dev/prompts/dbic_final_remaining_regressions_plan.md Step 1. Generated with [Devin](https://cli.devin.ai/docs) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

The base flatten commit added a `MortalList.flushAboveMark()` call after every non-last statement in a block. Comment claimed it was needed to fire DESTROY at statement boundaries. In practice this caused two regressions vs master: - op/for.t #103 (`do {17; foreach (1, 2) { 1; } } in scalar context`) returned undef instead of "" (foreach's empty-string result was being lost to the post-statement flush) - op/for.t #105 (`foreach (@_) { is eval { \$_ }, \undef, ...; }` over `(undef)`) — `$_` was no longer aliased to the canonical undef SV when the foreach list contained undef Removing the per-statement flushAboveMark restores both. The proper SAVETMPS/FREETMPS model is preserved by: - sub-entry pushMark (RuntimeCode.apply) - block-exit popAndFlush via emitScopeExitNullStores (still in EmitBlock at end of block, just NOT after every statement) - subroutine return value boundary Verified: - make: BUILD SUCCESSFUL - ./jcpan -t DBIx::Class: 314/314 PASS, 0 Dubious (1418 wallclock) - ./jcpan -t Moo: PASS - ./jcpan -t Template: PASS - op/for.t: 139 → 141 (matches master, recovers tests 103, 105) - op/postfixderef.t: 114 unchanged - op/grep.t: 74, op/sort.t: 178, op/recurse.t: 28 unchanged - Categories B+C unchanged (for-many 72, inccode 70, inccode-tie 74) Plan reference: dev/prompts/dbic_final_remaining_regressions_plan.md Steps 3 + 4 (combined fix — same root cause). Generated with [Devin](https://cli.devin.ai/docs) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

A rare NPE during END/global-destruction: Cannot read field "type" because "arr" is null GlobalDestruction.runGlobalDestruction line 42 `globalArrays.values()` and `globalHashes.values()` can contain sporadic null entries during END (e.g. when a TEMP glob's array slot is cleared mid-walk). The walk should defensively skip them rather than crash and abort the entire END queue. Visible in the postfixderef.t #38 test run after the END phase trying to walk arrays whose `type` field had been already cleared by a prior destructor. Plan reference: dev/prompts/dbic_final_remaining_regressions_plan.md Step 2 (NPE fix is a bundled subset; the full FREETMPS-at-do-block work was deferred per fallback note — DBIC parity takes priority). Generated with [Devin](https://cli.devin.ai/docs) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

Tests like op/stat.t (TTY-detection subtests), win32/seekdir.t (Windows filesystem), and porting/checkcase.t (file-count) report -1/-30/-27 in compare reports under the parallel perl_test_runner, but standalone runs on both master and feature branch produce identical pass counts. These are environmental flakes, not actual code regressions. Add a known-flake whitelist with documented reasons. By default, flake files are excluded from the regression count and shown in a separate "KNOWN-FLAKE FILES" section. Use --show-flakes to include them in the regression list. Effect on the merge gate: Before: 6 files with regressions (5 real + 30 + 27 environmental) After: 3 files with regressions (5 real tests) Skipped: 3 files (-58 tests) shown as known flakes Generated with [Devin](https://cli.devin.ai/docs) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

@A

…stant" Real Perl rejects `tie FH, 'main';` at compile time: Can't modify constant item in tie at - line 3, near "'main';" PerlOnJava previously accepted it and failed at runtime with the unrelated "Can't locate object method TIESCALAR via package main". The tie/untie/tied prototype `\[$@%*]` (lvalue scalar/array/hash/glob group) requires its first argument to be an lvalue. A bareword identifier at that position would parse as a constant function call — not modifiable. Real Perl rejects this at compile time. Fix: in `PrototypeArgs.handleBackslashArgument`, when the parsed arg inside a `\[...]` group is a bare `IdentifierNode`, throw a compile- time error matching real Perl's message format exactly. The "near" text is built manually from the upcoming tokens (rather than relying on `buildNearString`'s 3-token limit) so the diagnostic shows the last argument + statement terminator (e.g. `"'main';"`). Valid forms unaffected: tie *FH, 'main'; # glob — OK tie $s, 'main'; # scalar lvalue — OK tie @A, 'main'; # array lvalue — OK tie %h, 'main'; # hash lvalue — OK Only `tie BAREWORD, ...` is rejected. Recovers `op/tie.t` from 58/95 → 59/95 (matches master). DBIC risk: zero. DBIC never `tie`s a bareword; this only adds a compile-time error for invalid syntax that no DBIC code uses. Verified: make: BUILD SUCCESSFUL DBIC fast check: 8/8 PASS Plan reference: dev/prompts/dbic_final_remaining_regressions_plan.md Step B. Generated with [Devin](https://cli.devin.ai/docs) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

@array

… exit When a global @array or %hash is localized via `local @x`/`local %x`, GlobalRuntimeArray/GlobalRuntimeHash swap the global slot with a fresh empty container. If the local container is then blessed during the scope (e.g. `bless \@x, 'Class'`), at scope exit the local container is discarded silently — DESTROY never fires. This is what postfixderef.t #40 "no stooges outlast their scope" exercises via `local @curly; bless \'curly'->@*, 'coulda';` (symref deref). Fix: in GlobalRuntimeArray.dynamicRestoreState and GlobalRuntimeHash .dynamicRestoreState, before swapping the original container back, check if the displaced (local) container is blessed and DESTROY hasn't already fired. If so, mark refCount = MIN_VALUE and call DestroyDispatch .callDestroy(localContainer). The destroyFired guard prevents double-fire when an inner `my $obj = bless \@x, ...` already cascaded DESTROY first. Also propagate the same logic to RuntimeArray/RuntimeHash dynamicRestoreState for the in-place save/restore path used by lexical aliases / DynamicVariableManager. Test: perl5_t/t/op/postfixderef.t #40 now passes (previously failing). Verified gates: - make: BUILD SUCCESSFUL, all unit tests PASS - DBIC: 313/314 (1 flake, t/cdbi/68-inflate_has_a.t passes standalone) - Moo: 71/71 PASS - Template::Toolkit: 106/106 PASS - op/local.t: identical baseline (no regression) Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

Three implementation paths analyzed, recommendation Path 3 (AST analysis). Step D remains deferred pending careful DBIC stress-testing. Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

When a `do { ... }` block's last expression is a "fresh-result" operator (`!`, `not`, `==`, `eq`, comparison ops, `defined`, `exists`, `ref`, `length`, `scalar`, `wantarray`, `isa`, or a literal), the block's return value is guaranteed to be a brand-new RuntimeScalar (boolean/number/string) that does NOT alias any inner my-var or container. In that case it is safe to flush the MortalList at do-block scope exit, which fires DESTROY for transient blessed objects whose lexical owners went out of scope inside the do-block. This matches Perl 5's SAVETMPS/FREETMPS semantics and fixes op/do.t test #70 RT 124248: f(do { 1; !!(my \$x = bless []); }); For do-blocks whose last expression is anything else (e.g. a variable read like `\$x`, a function call, a reference operator, etc.), the existing flush=false behavior is preserved. This keeps DBIC's `\$self->{cursor} ||= do { my \$x = ...; \$x }` pattern working — the result IS an inner my-var, so we must not flush. Implementation: small whitelist of always-fresh-result operators in EmitBlock.doBlockResultIsAlwaysFresh(). When the do-block's last element matches, pass flush=true to emitScopeExitNullStores. Conservative — returns false for anything not on the whitelist. Verified gates: - make: BUILD SUCCESSFUL, all unit tests PASS - DBIx::Class: 314/314 PASS, 13858 subtests, Result: PASS - Moo: 71/71 PASS - Template::Toolkit: 106/106 PASS - op/do.t: 69/73 (matches master baseline; RT 124248 now passes) - perl_test_runner perl5_t/t/op/: net +1 ok / -1 not_ok = exactly the RT 124248 fix, zero new regressions across 43524 op/ tests. Closes the last regression on feature/dbic-final-integration vs master. Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

fglock and others added 30 commits April 26, 2026 21:39

Revert "fix(interpreter): patchLastHashGetForLocal must not misinterp…

db5fe31

…ret operands" This reverts commit 8c69500.

fglock and others added 13 commits April 26, 2026 21:39

docs: update plan doc with current status, Step C complete

05e35fd

docs: Step D Path 1 attempt rejected (2 new regressions)

ba8021a

fglock merged commit 12fb016 into master Apr 27, 2026
2 checks passed

fglock deleted the feature/dbic-final-integration branch April 27, 2026 07:55

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fix: eliminate remaining DBIC-final regressions (op/do.t, op/postfixderef.t, op/tie.t)#566

fix: eliminate remaining DBIC-final regressions (op/do.t, op/postfixderef.t, op/tie.t)#566
fglock merged 43 commits intomasterfrom
feature/dbic-final-integration

fglock commented Apr 27, 2026

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fglock commented Apr 27, 2026

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