ParparVM: collector and codegen cleanup - #5658

Merged

shai-almog merged 42 commits into

vm-performance-and-gc-cleanup

Sep 2, 2026

Commits on Sep 1, 2026

Make the clean target a usable program runtime, and let casts fail

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77da14d
Measure what a thread costs, and make the per-thread sizes tunable

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01b366d
Stop discarding uncaught exceptions on the clean target

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3d4b378
Fix two ParparVM portability bugs the backend build hit

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2ed10e5
Add virtual threads to the VM

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8d8e894
Yield the virtual thread instead of sleeping its carrier

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7f85de9
Keep the virtual-thread API out of the conservative-roots block

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7cfea66
Capture errno before the GC safepoint in the Linux socket read

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67a61b0
Stop waiting on a thread the GC cannot stop

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15bd697
Turn virtual threads on wherever the switch exists, and file .S as assembly

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6e6a18a
Assemble the .S the generated projects have been shipping unassembled

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fe581d5

Commits on Sep 2, 2026

Close five review findings on the VM half

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be886b6
Make the direct JSON writer agree with the map path, and test that it does

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03d2bf2
Give java.io.File a Windows implementation, and stage the header it now needs

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0119acd
An archive must not write outside the directory it is unpacked into

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9b4b1ca
Finish the Windows java.io.File arm: the four gaps behind the first one

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cea27a2
Zero a pthread_t portably, and stop declaring a local Windows cannot use

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ba22565
Close the VM-half review findings, and record the two that stay open

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80da86d
Four more ways the direct JSON writer disagreed with the map path

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764587f
Enumerate a directory once, and clamp skip without overflowing first

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6155b5f
Resolve drive-relative Windows paths, and create files in one syscall

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a112185
Decode argv and the environment as UTF-8 instead of widening bytes

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eaec4ed
Decode argv and the environment in the PLATFORM's encoding, not always UTF-8

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3451ef0
Validate an array store's index before checking its element type

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ea35b3b
Revert marking a running virtual thread's state active -- it hangs the collector

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2b9d12a
Stop the array store check rejecting valid multidimensional stores

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48e84bb
Probe an unresponsive thread briefly instead of skipping its roots

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287ab9d
Emit JSON null for an unset boxed Boolean or Character

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bb98371
Report thread-table exhaustion instead of writing before the table

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9f27f80
Mark active only what the collector can stop, and unbind TLS before freeing

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99f9263
Keep an unmapped reference field's wire type a string

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e1ea719
Honour close() on System.in

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f13a53c
Mark the unfinished VM surfaces EXPERIMENTAL, and keep checked casts inert

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fbc8ca8
Record the registry-snapshot scope as an experimental gap, not a fix

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9896b1f
Make the uncaught-exception test's timeout reachable

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de54965
File.renameTo renamed the destination onto itself

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5694e15
Keep unmapped list elements raw -- a regression from the reference fix

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2907915
Release a file stream's native handle if it is never closed

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30d7662
Qualify rooted Windows paths, make close idempotent, list the snapshot cap

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bd2057f
Park the mutator around every blocking stdio call, not just read and write

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0c96b7b
Answer null for an environment name holding a NUL; decline the rest

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9f7d96b
Park the seeks too, and let the thread benchmark exit

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4729dea