ParparVM: make the translator self-hosting, and fix what that exposed - #5766

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shai-almog wants to merge 67 commits into

parparvm-selfhost-optimizations

Commits on Sep 9, 2026

Give ParparVM real primitive class objects; Integer.TYPE was null

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da3e292
Make ParparVM self-hosting: the translator now translates itself

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87be20f
Measure the self-hosted translator: it is 6x slower and uses 2.8x the memory

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9ebb174

Commits on Sep 10, 2026

Stop stubbing JavascriptNativeRegistry; gates A and B are now byte-identical

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842bc63
Profile the self-hosted translator: the 6x gap is one pacing clamp, not the GC

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6263a35
Scale the GC pacing floor with available RAM, and index the constant pool

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fff6f53
Wire up the heap/allocation census, and make -O3 imply ThinLTO

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0077691
Stop ArrayList and IdentityHashMap allocating for nothing

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82a710a
Add a live-heap census: what is IN the heap, not just what was allocated

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3f20c45
Census the heap by WHY each slot is occupied, and answer it with experiments

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3f1bee7
Make the second grace cycle optional: it is a 2014 pre-SATB workaround

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d12892d
Revert the aging switch: the rule is load-bearing, and it was only worth 2-3%

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6069535
Record why the second grace cycle stays: four mechanisms now depend on it

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f44235f
ParparVM: make the translator self-hosting, and fix what that exposed

shaiblah
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118044d
Review fixes: guard on the completion flag, refuse stack manipulation, keep the pacing bound off placeholder hosts
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01643b7
Apple targets: stop the translated java.io.File overwriting the port's native
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a57b3ec
Revert the inline class-init guards; keep the memory-ordering fix
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b236ee3

Commits on Sep 11, 2026

Park at the safepoint after a pacing assist, and drop a synthetic bridge

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28e62d6
Give a for-each the concrete Iterator type its collection returns

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f0718e6
Collect real crash evidence, and withdraw the lazy ArrayList allocation

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68503d5
Root cause: the fused concat natives allocate with the source strings unrooted

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2ad038a
Revert the fused-concat GC bracket: the premise was wrong

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a5ec187
BISECT PROBE: turn off both bytecode-rewriting passes

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7d1b503
BISECT PROBE 2: revert the whole runtime side to the merge base

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718aa7b
BISECT PROBE 3: the cause is in the runtime; narrow it to java/util

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036daff
Bounds-check the ArrayList iterator's array read

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25205a8

Commits on Sep 12, 2026

Withdraw the GC pacing work and the String natives; keep what is justified

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2700998
Restore the pacing cap, drop the StringBuilder growth change

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84065db
Merge remote-tracking branch 'origin/master' into parparvm-selfhost-optimizations
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7d8754b
Re-apply the self-hosting rewrites on top of master's refactor

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c81f41d
Fix the iterator lowering's lifetime bug, and withdraw the concat fusion

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f00db7e
Review round: primitive-class reflection, empty resources, duplicate cores

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8275e5b
Restore readFileAsString, and make replaceInFile single-pass

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ea47102
Install gdb from an absolute path: it has never been installed at all

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4333174
Guard class use on completion, not on "initialisation started"

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1b2cbfb
Bind Class.getResourceAsStream to the generated port resource tables

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670fb6c
PROBE: run the Linux suite with the mutator assist disabled

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73a49fc
Add a diagnostic define hook to the generated Linux CMake project

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a995987
Guard the Windows resource override behind _WIN32

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3c32a10
The mutator assist is exonerated; turn the heap verifier on instead

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7a4b086
Make the verifier run prove it ran

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8483268
Report whether the generated project declares the diagnostic hook

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a86b7cd
Probe the built ELF for the verifier instead of trusting the chain

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7eaab0b
The GC is exonerated: 2213 clean epochs. Look at page recycling instead

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ef5b6f9
PROBE: revert java/util, the last delta the collector work did not clear

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2f6748b
PROBE: withdraw the safepoint park; restore java/util, which is clear

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628c0da
PROBE: stop handing out the primitive class objects

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c66da37
Initialise java.lang.Class before handing out a primitive class object

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ed057be
Register the primitive class descriptors in the GC's clazz registry

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1c6dc85

Commits on Sep 13, 2026

Commits on Sep 14, 2026