fix(codegen): canonicalize constants before RS4GC - #8068
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📝 WalkthroughWalkthroughThe RS4GC pipeline now runs ChangesRS4GC root consistency
Estimated code review effort: 3 (Moderate) | ~20 minutes Mergeability Score: ⚪ Minimal · up to The change canonicalizes constant folding before GC lowering, with focused regressions and build checks passing; no actionable merge-blocking risk remains. Sequence Diagram(s)sequenceDiagram
participant IRConstruction
participant Mem2RegSCCP
participant RS4GC
participant TextAndNativeEmitter
IRConstruction->>Mem2RegSCCP: construct IR and canonicalize folds
Mem2RegSCCP->>RS4GC: provide folded IR with dynamic roots
RS4GC->>TextAndNativeEmitter: add gc-live metadata and relocations
TextAndNativeEmitter-->>IRConstruction: produce comparable assembly
Possibly related PRs
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In `@crates/perry-codegen/src/inprocess.rs`:
- Around line 445-455: Update the generated IR around may_collect so cslot0
through cslot7 are loaded and combined after the safepoint, keeping
constant-root-derived values live across it. Modify the IR construction in the
surrounding in-process fixture while preserving the existing XOR reduction and
return behavior.
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changelog.d/8068-rs4gc-constant-fold-order.mdcrates/perry-codegen/src/inprocess.rscrates/perry-codegen/src/native_emit.rs
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Summary
Canonicalize construction-time constant folds before RewriteStatepointsForGC so textual parsing and native C-API construction assign the same live roots, machine code, and compact GC map.
This is the narrow follow-up found by the local #7971 audit. #7971 remains open until this PR lands and the complete matrix is rerun on latest
main.Changes
gc-liveandgc.relocatebefore exact emitted-byte equality.This is distinct from #8052/#8062: that fix applied precise-root lowering to the native path; this fix converges construction-time constant folding before the already-shared RS4GC pass assigns liveness.
Related issue
Closes #8065.
Refs #7971.
Refs #7966.
Test plan
Exact tested product base:
fe4cd09db0f1e260fc0ff63ec2e5c0079fceac3d(the later #8066 commit is CI-only and non-overlapping). PR branch base:08173f8b403be848f2218746b22a462fd883042f.Focused shared regression: 1 passed, exit 0.
Focused direct + split emitted-object regressions: 2 passed, exit 0.
cargo build --profile perry-dev -p perry -p perry-runtime-static -p perry-stdlib-static --features perry/llvm-inprocess: exit 0 with LLVM 22.1.4.Spike diff: byte-identical text/native objects, 164671 bytes; compile and verdict assertion exit 0.
Spike text/native: all compile/execute statuses 0; banner assertion 0; behavior
cmp0 (92 bytes, SHA-256ccfecd9c51f0cd29a7fa349f3047d527e96b2b60f2078a269f91d0e9b6a4bf9c).Batch diff with
PERRY_CODEGEN_UNITS=3: byte-identical merged objects, 58160 bytes; command and 3-unit assertion exit 0.EH text/native/diff: all compile/execute statuses 0; native banner assertion 0; behavior
cmp0 (116 bytes, SHA-2561e5f575323cceebe5e2e822084f346097845a7050e885ed83de45b25e8d7a6b6); diff verdict 266985 bytes, exit/assertion 0.PERRY_RUNTIME_DIRpinned to the isolated perry-dev target withPERRY_NO_AUTO_OPTIMIZE=1; runtime and stdlib archives remained unchanged at mtimes1786670014and1786670221.cargo fmt --all -- --check: exit 0.git diff --check: exit 0.cargo build --releasecleancargo test --workspace --exclude perry-ui-ios --exclude perry-ui-tvos --exclude perry-ui-watchos --exclude perry-ui-gtk4 --exclude perry-ui-android --exclude perry-ui-windowspasses(if user-facing) Added or updated a test under
test-files/or a#[test]in the affected crate(if CLI / stdlib / runtime API changed) Updated
docs/src/(if touching a platform UI backend) Built
-p perry-ui-<backend>locally on that platformChecklist
feat:/fix:/docs:/chore:prefix convention used in the logSummary by CodeRabbit
Bug Fixes
Tests