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

Open

shai-almog wants to merge 49 commits into

parparvm-selfhost-optimizations

Commits on Sep 9, 2026

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

shai-almog
and
claude
committed
da3e292
Make ParparVM self-hosting: the translator now translates itself

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

shai-almog
and
claude
committed
9ebb174

Commits on Sep 10, 2026

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

shai-almog
and
claude
committed
842bc63
Profile the self-hosted translator: the 6x gap is one pacing clamp, not the GC

shai-almog
and
claude
committed
6263a35
Scale the GC pacing floor with available RAM, and index the constant pool

shai-almog
and
claude
committed
fff6f53
Wire up the heap/allocation census, and make -O3 imply ThinLTO

shai-almog
and
claude
committed
0077691
Stop ArrayList and IdentityHashMap allocating for nothing

shai-almog
and
claude
committed
82a710a
Add a live-heap census: what is IN the heap, not just what was allocated

shai-almog
and
claude
committed
3f20c45
Census the heap by WHY each slot is occupied, and answer it with experiments

shai-almog
and
claude
committed
3f1bee7
Make the second grace cycle optional: it is a 2014 pre-SATB workaround

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

shai-almog
and
claude
committed
6069535
Record why the second grace cycle stays: four mechanisms now depend on it

shai-almog
and
claude
committed
f44235f
ParparVM: make the translator self-hosting, and fix what that exposed

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

Commits on Sep 11, 2026

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

shai-almog
and
claude
committed
28e62d6
Give a for-each the concrete Iterator type its collection returns

shai-almog
and
claude
committed
f0718e6
Collect real crash evidence, and withdraw the lazy ArrayList allocation

shai-almog
and
claude
committed
68503d5
Root cause: the fused concat natives allocate with the source strings unrooted

shai-almog
and
claude
committed
2ad038a
Revert the fused-concat GC bracket: the premise was wrong

shai-almog
and
claude
committed
a5ec187
BISECT PROBE: turn off both bytecode-rewriting passes

shai-almog
and
claude
committed
7d1b503
BISECT PROBE 2: revert the whole runtime side to the merge base

shai-almog
and
claude
committed
718aa7b
BISECT PROBE 3: the cause is in the runtime; narrow it to java/util

shai-almog
and
claude
committed
036daff
Bounds-check the ArrayList iterator's array read

shai-almog
and
claude
committed
25205a8

Commits on Sep 12, 2026

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

shai-almog
and
claude
committed
2700998
Restore the pacing cap, drop the StringBuilder growth change

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

shai-almog
and
claude
committed
c81f41d
Fix the iterator lowering's lifetime bug, and withdraw the concat fusion

shai-almog
and
claude
committed
f00db7e
Review round: primitive-class reflection, empty resources, duplicate cores

shai-almog
and
claude
committed
8275e5b
Restore readFileAsString, and make replaceInFile single-pass

shai-almog
and
claude
committed
ea47102
Install gdb from an absolute path: it has never been installed at all

shai-almog
and
claude
committed
4333174
Guard class use on completion, not on "initialisation started"

shai-almog
and
claude
committed
1b2cbfb
Bind Class.getResourceAsStream to the generated port resource tables

shai-almog
and
claude
committed
670fb6c
PROBE: run the Linux suite with the mutator assist disabled

shai-almog
and
claude
committed
73a49fc
Add a diagnostic define hook to the generated Linux CMake project

shai-almog
and
claude
committed
a995987
Guard the Windows resource override behind _WIN32

shai-almog
and
claude
committed
3c32a10
The mutator assist is exonerated; turn the heap verifier on instead

shai-almog
and
claude
committed
7a4b086
Make the verifier run prove it ran

shai-almog
and
claude
committed
8483268
Report whether the generated project declares the diagnostic hook

shai-almog
and
claude
committed
a86b7cd
Probe the built ELF for the verifier instead of trusting the chain

shai-almog
and
claude
committed
7eaab0b
The GC is exonerated: 2213 clean epochs. Look at page recycling instead

shai-almog
and
claude
committed
ef5b6f9
PROBE: revert java/util, the last delta the collector work did not clear

shai-almog
and
claude
committed
2f6748b
PROBE: withdraw the safepoint park; restore java/util, which is clear

shai-almog
and
claude
committed
628c0da
PROBE: stop handing out the primitive class objects

shai-almog
and
claude
committed
c66da37
Initialise java.lang.Class before handing out a primitive class object

shai-almog
and
claude
committed
ed057be
Register the primitive class descriptors in the GC's clazz registry

shai-almog
and
claude
committed
1c6dc85