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Fix loop-carried results, Array.shift GEP stride, and mismatched-catch rethrow (#230)
Three correctness bugs found in a static audit of LowerToAffineLoops.cpp and LowerToLLVM.cpp: - ForOpLowering dropped loop-carried results for infinite for(;;) loops because the NoConditionOp branch never assigned the replacement values. - ArrayShiftOpLowering computed the post-shift memmove offset with a hardcoded i32 GEP stride instead of the array's real element type, corrupting Array<number>.shift() and other wider-than-i32 element arrays. - TryOpLowering's typed-catch RTTI mismatch (non-Windows/Itanium path) silently fell through to normal control flow instead of rethrowing, per the code's own TODO comment. Adds regression tests for all three and a review doc covering these plus 7 additional lower-confidence findings tracked for follow-up.
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‎docs/LowerToAffineLoops-LowerToLLVM-review.md‎

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# LowerToAffineLoops.cpp / LowerToLLVM.cpp — bug review (2026-07-13)
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Static correctness audit of the two MLIR lowering passes
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(`tslang/lib/TypeScript/LowerToAffineLoops.cpp`, TypeScript dialect → Affine/SCF/CF,
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2325 lines; `tslang/lib/TypeScript/LowerToLLVM.cpp`, → LLVM IR, 6585 lines).
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Neither file had uncommitted changes or recent history at review time (last
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real touch was PR #198) — this was a full-file static audit, not a diff
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review, done via 8 parallel finder passes + direct verification.
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Status key: **CONFIRMED** = verified by reading the exact lines and comparing
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against sibling code/behavior. **PLAUSIBLE** = strong evidence, not
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independently reproduced with a running compiler.
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## Fixed in this pass (items 1–3)
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Verified: full ctest suite green after all three fixes (339/339 JIT, 342/342
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AOT, `ctest --test-dir __build/tslang/windows-msbuild-2026-debug -C Debug -j8`).
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Items 1–2 additionally verified by direct JIT execution of new test cases;
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item 3 verified via `--emit=mlir-affine --mtriple=x86_64-pc-linux-gnu` IR
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inspection (this Windows JIT host can't execute the Itanium exception ABI the
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fix targets, since `isWindows` is derived from the target triple and this
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build's SEH path never sets `cmpValue` at all — see the method note at the
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bottom).
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### 1. `ForOp` lowering drops loop-carried results for `for(;;)` — CONFIRMED, FIXED, VERIFIED
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`LowerToAffineLoops.cpp:611-696` (`ForOpLowering`). `ValueRange args;` is
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default-constructed and only assigned from `condOp.getArgs()` in the
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`ConditionOp` branch (line 669). The `NoConditionOp` branch (infinite
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`for(;;)`, lines 674-678) never assigns `args`, so `rewriter.replaceOp(forOp,
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args)` at line 692 replaces all of `forOp`'s results with an empty list.
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**Failure scenario:** a `for(;;) { ... }` loop with loop-carried values
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(`ForOp`/`NoConditionOp` support `Variadic<AnyType>:$args`) hits the
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`replaceOp` result-count mismatch — an assert/crash in `applyPartialConversion`,
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or malformed IR in release builds.
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**Fix:** assign `args = noCondOp.getArgs()` in the `else` branch, mirroring the
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`ConditionOp` branch.
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**Verified:** JIT-executed a `for(;;) { if (i>=5) break; sum += i; i++; }`
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returning `sum` — correctly returns 10 (0+1+2+3+4), no crash.
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### 2. `ArrayShiftOp` uses wrong GEP element type — CONFIRMED, FIXED, VERIFIED
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`LowerToLLVM.cpp:2623-2624` (`ArrayShiftOpLowering`). The GEP computing the
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"rest of the array" source pointer for the post-shift `MemoryMoveOp` was built
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with `th.getI32Type()` as the GEP element type:
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```cpp
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auto offset1 =
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rewriter.create<LLVM::GEPOp>(loc, th.getPtrType(), th.getI32Type(), currentPtr, ValueRange{incSize});
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```
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Every sibling array-mutation pattern (`ArrayPushOp`, `ArrayUnshiftOp`,
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`ArraySpliceOp`) and even the immediately preceding GEP in the same function
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(line 2620, `offset0`) correctly use `llvmElementType` as the GEP element type.
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**Failure scenario:** `Array<number>.shift()` (element type `f64`, 8 bytes)
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computed the shift's source offset using a 4-byte stride instead of 8,
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corrupting array contents or reading out of bounds for arrays of
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wider-than-i32 elements.
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**Fix:** changed the GEP element type from `th.getI32Type()` to
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`llvmElementType`.
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**Verified:** JIT-executed `[10.5,20.5,30.5,40.5].shift()` — `first === 10.5`,
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remaining array is exactly `[20.5, 30.5, 40.5]` in order.
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### 3. Mismatched typed `catch` silently falls through instead of rethrowing — CONFIRMED, FIXED, VERIFIED
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`LowerToAffineLoops.cpp:1620-1633` (`TryOpLowering`, non-Windows/Itanium path).
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When the RTTI comparison (`cmpValue`) for a typed `catch` clause is false (the
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thrown value's type doesn't match the declared catch type), the conditional
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branch's false edge went to `continuation` — ordinary post-try control flow —
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instead of propagating/rethrowing the exception. The code carried its own
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admission of this: `// TODO: when catch not matching - should go into result
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(rethrow)`.
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**Failure scenario:** `try { throw new TypeError() } catch (e: RangeError) {}`
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on the Itanium/Linux path silently swallowed the mismatched exception and
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continued normal execution instead of propagating it to an enclosing handler
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or terminating the process.
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**Fix:** on RTTI mismatch, branch to a new block that creates a `NullOp` +
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`ThrowOp` (the existing "rethrow current exception" idiom used elsewhere in
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this function, e.g. the finally-rethrow path at line ~1605) instead of
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branching to `continuation`. If a parent `TryOp`'s landing pad exists
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(`parentTryOpLandingPad`), `tsContext->unwind[rethrowOp]` is set so
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`ThrowOpLowering` emits `ThrowUnwindOp` targeting it directly; otherwise
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`ThrowOpLowering` falls back to `ThrowCallOp` (process-level rethrow). No
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`EndCatchOp` is needed before the rethrow, matching the existing precedent's
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comment ("we do not need EndCatch as throw will redirect execution anyway").
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**Verified:** could not execute the Itanium ABI path natively on this Windows
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JIT host (see method note), so verified via `--emit=mlir-affine
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--mtriple=x86_64-pc-linux-gnu` IR dump instead of JIT execution:
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- Single-level mismatch (`try{throw TypeErrorX}catch(e:RangeErrorX){}`, no
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parent try): false branch now emits `ts.Null` + `ts.ThrowCall` instead of
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branching to the continuation block.
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- Nested case (`try{try{throw TypeErrorX}catch(e:RangeErrorX){}}catch(e:TypeErrorX){}`):
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inner mismatch emits `ts.Null` + `ts.ThrowUnwind(...)[^parentLandingPad]`,
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which correctly re-enters the outer try's landing pad, re-evaluates its RTTI
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compare, matches, and the outer catch runs — confirmed by reading the full
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block chain in the IR dump.
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- Matching-catch happy path re-verified unaffected (JIT-executed, returns the
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caught value correctly).
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- Full ctest suite (339 JIT + 342 AOT) green with this change in place.
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## Remaining known issues (not yet fixed, tracked here for follow-up)
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4. **`LowerToAffineLoops.cpp:494,567,635,717`** (While/DoWhile/For/Label
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lowering) — the `visitorBreakContinue` walk recurses into nested
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loop/label regions, not just the immediate body. An unlabeled
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`break`/`continue` inside a nested loop can have its `tsContext->jumps[op]`
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entry set by either the inner or outer loop's walk, with the last one to
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run winning — order-dependent, so a nested unlabeled `break` could jump out
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of both loops instead of just the inner one. PLAUSIBLE, not yet fixed.
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5. **`LowerToAffineLoops.cpp:1351,1358,1370`** (`TryOpLowering`, `finally`
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region cloning) — the `finally` region is cloned twice (normal-exit and
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return-cleanup copies) *after* the `parentTryOp`/`jumps` side-tables were
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populated by walking only the original region. A nested `try` or a
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`break`/`continue` inside a `finally` block loses correct wiring in the
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cloned copies. PLAUSIBLE, not yet fixed — needs a test case (`grep` of
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`test/` found no try/finally-nesting coverage).
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6. **`LowerToLLVM.cpp:1271`** (`SymbolCallInternalOpLowering`) — `llvmFuncType`
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can remain null if `moduleOp.lookupSymbol` fails to resolve or the symbol is
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an unexpected kind; only guarded by a debug-only `assert`, no `return
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failure()` guard. PLAUSIBLE, not yet fixed.
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7. **`LowerToLLVM.cpp:2043`** (`NewOpLowering`, stack-allocation path) —
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allocates using `resultType` (converted pointer type) instead of
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`storageType` (actual class layout) used by the sibling heap-allocation
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path; asymmetry could under-allocate the stack slot for `new` with
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`getStackAlloc()` set. PLAUSIBLE, needs confirming what `resultType`
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actually converts to for class types before treating as certain.
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8. **`LowerToLLVM.cpp:4159`** (`LandingPadOpLowering`, Windows path) —
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cleanup-only branch reuses the typed-catch filter value instead of an
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empty/undef cleanup clause; the code has its own `// BUG: in LLVM landing
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pad is not fully implemented` comment. PLAUSIBLE, not yet fixed.
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9. **`LowerToAffineLoops.cpp:1660`** (`TryOpLowering`, `linuxHasCleanups`) —
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merges `catchesBlock`/`finallyBlock` into `cleanupBlockLast` only when
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`catchHasOps`/`finallyHasOps`, but `linuxHasCleanups` doesn't imply either;
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a cleanup-only try with no catch/finally content could erase
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`cleanupBlockLast`'s terminator with nothing replacing it. PLAUSIBLE, not
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yet fixed.
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10. **`LowerToAffineLoops.cpp:763`** (`LabelOpLowering`) — falls back to
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`assert(false)` if the label region's terminator block isn't a `MergeOp`;
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in release builds (asserts stripped) this is a silent no-op leaving a
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malformed CFG if the label region's live last block doesn't end in
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`MergeOp` (e.g. dead code after a break-only path). PLAUSIBLE, not yet
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fixed. Same pattern exists in `SwitchOpLowering` at line ~854.
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## Other observations (not correctness bugs, lower priority)
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- **Duplication**: the `visitorBreakContinue` lambda is copy-pasted verbatim
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in `WhileOpLowering`, `DoWhileOpLowering`, `ForOpLowering`, `LabelOpLowering`
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(~14 lines × 4). Six near-identical accessor-lowering structs in
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`LowerToAffineLoops.cpp` (905-1205, `ThisAccessorOp` through
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`BoundIndirectIndexAccessorOp`) could collapse to one templated helper.
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`CallHybridInternalOpLowering`/`InvokeHybridOpLowering` in `LowerToLLVM.cpp`
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duplicate ~100 lines of this-pointer/vtable dispatch logic.
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- **Altitude**: GC-root registration (`LowerToLLVM.cpp:1911`) and
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side-effect detection for global initializers (`LowerToLLVM.cpp:3492`, with
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a commented-out `MemoryEffectOpInterface` version right below it) both
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enumerate specific op/type kinds by hand instead of querying a trait —
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same class of issue as the `jit-globals-not-gc-roots` GC memory. A new type
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or op added elsewhere silently isn't covered.
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- No `CLAUDE.md` exists anywhere in this repo, so no conventions check
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applied.
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## Method note
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MLIR's dialect-conversion driver pre-collects a pre-order worklist (verified
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against `DialectConversion.cpp`), so parent ops always convert before their
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*original* nested children — ruling out a naive "child converted before
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parent sets up its context" race for `tsContext` side-tables. The real hazard
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in this file is region **cloning** (item 5): clones are new `Operation*`
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instances not covered by side-table entries populated before the clone was
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made.

‎tslang/lib/TypeScript/LowerToAffineLoops.cpp‎

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@@ -674,6 +674,7 @@ struct ForOpLowering : public TsPattern<mlir_ts::ForOp>
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else
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{
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auto noCondOp = cast<mlir_ts::NoConditionOp>(condLast->getTerminator());
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args = noCondOp.getArgs();
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rewriter.replaceOpWithNewOp<mlir::cf::BranchOp>(noCondOp, body, noCondOp.getArgs());
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}
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@@ -1625,10 +1626,20 @@ struct TryOpLowering : public TsPattern<mlir_ts::TryOp>
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mlir::Block *currentBlockBrCmp = rewriter.getInsertionBlock();
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mlir::Block *continuationBrCmp = rewriter.splitBlock(currentBlockBrCmp, rewriter.getInsertionPoint());
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// when the caught value's type does not match this catch clause, rethrow
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// instead of falling through to normal post-try control flow.
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auto *rethrowBlock = rewriter.createBlock(continuationBrCmp);
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rewriter.setInsertionPointToStart(rethrowBlock);
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auto rethrowVal = rewriter.create<mlir_ts::NullOp>(loc, mth.getNullType());
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auto rethrowOp = rewriter.create<mlir_ts::ThrowOp>(loc, rethrowVal);
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if (parentTryOpLandingPad)
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{
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tsContext->unwind[rethrowOp] = parentTryOpLandingPad;
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}
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rewriter.setInsertionPointAfterValue(cmpValue);
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// TODO: when catch not matching - should go into result (rethrow)
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auto castToI1 = rewriter.create<mlir_ts::CastOp>(loc, rewriter.getI1Type(), cmpValue);
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rewriter.create<mlir::cf::CondBranchOp>(loc, castToI1, continuationBrCmp, continuation);
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rewriter.create<mlir::cf::CondBranchOp>(loc, castToI1, continuationBrCmp, rethrowBlock);
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// end of condbr
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}
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‎tslang/lib/TypeScript/LowerToLLVM.cpp‎

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Original file line numberDiff line numberDiff line change
@@ -2621,7 +2621,7 @@ struct ArrayShiftOpLowering : public TsLlvmPattern<mlir_ts::ArrayShiftOp>
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auto loadedElement = rewriter.create<LLVM::LoadOp>(loc, llvmElementType, offset0);
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auto offset1 =
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rewriter.create<LLVM::GEPOp>(loc, th.getPtrType(), th.getI32Type(), currentPtr, ValueRange{incSize});
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rewriter.create<LLVM::GEPOp>(loc, th.getPtrType(), llvmElementType, currentPtr, ValueRange{incSize});
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auto sizeOfTypeValueMLIR = rewriter.create<mlir_ts::SizeOfOp>(loc, th.getIndexType(), storageType);
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auto sizeOfTypeValue = rewriter.create<mlir_ts::DialectCastOp>(loc, llvmIndexType, sizeOfTypeValueMLIR);

‎tslang/test/tester/CMakeLists.txt‎

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@@ -152,6 +152,7 @@ add_test(NAME test-compile-00-if_return COMMAND test-runner "${PROJECT_SOURCE_DI
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add_test(NAME test-compile-00-dowhile COMMAND test-runner "${PROJECT_SOURCE_DIR}/test/tester/tests/00dowhile.ts")
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add_test(NAME test-compile-00-while COMMAND test-runner "${PROJECT_SOURCE_DIR}/test/tester/tests/00while.ts")
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add_test(NAME test-compile-00-for COMMAND test-runner "${PROJECT_SOURCE_DIR}/test/tester/tests/00for.ts")
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add_test(NAME test-compile-00-for-infinite-result COMMAND test-runner "${PROJECT_SOURCE_DIR}/test/tester/tests/00for_infinite_result.ts")
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add_test(NAME test-compile-00-break-continue COMMAND test-runner "${PROJECT_SOURCE_DIR}/test/tester/tests/00break_continue.ts")
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add_test(NAME test-compile-00-vars COMMAND test-runner "${PROJECT_SOURCE_DIR}/test/tester/tests/00vars.ts")
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add_test(NAME test-compile-00-var-bindings COMMAND test-runner "${PROJECT_SOURCE_DIR}/test/tester/tests/00var_bindings.ts")
@@ -162,6 +163,7 @@ add_test(NAME test-compile-00-arrays COMMAND test-runner "${PROJECT_SOURCE_DIR}/
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add_test(NAME test-compile-00-arrays2 COMMAND test-runner "${PROJECT_SOURCE_DIR}/test/tester/tests/00array2.ts")
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add_test(NAME test-compile-00-arrays3 COMMAND test-runner "${PROJECT_SOURCE_DIR}/test/tester/tests/00array3.ts")
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add_test(NAME test-compile-00-arrays4-push-pop COMMAND test-runner "${PROJECT_SOURCE_DIR}/test/tester/tests/00array4_push_pop.ts")
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add_test(NAME test-compile-00-array-shift COMMAND test-runner "${PROJECT_SOURCE_DIR}/test/tester/tests/00array_shift.ts")
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add_test(NAME test-compile-00-arrays5-deconstruct COMMAND test-runner "${PROJECT_SOURCE_DIR}/test/tester/tests/00array5_deconst.ts")
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add_test(NAME test-compile-00-arrays6 COMMAND test-runner "${PROJECT_SOURCE_DIR}/test/tester/tests/00array6.ts")
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add_test(NAME test-compile-00-arrays7 COMMAND test-runner "${PROJECT_SOURCE_DIR}/test/tester/tests/00array7.ts")
@@ -308,6 +310,7 @@ add_test(NAME test-compile-00-try-finally COMMAND test-runner "${PROJECT_SOURCE_
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add_test(NAME test-compile-01-try-finally COMMAND test-runner "${PROJECT_SOURCE_DIR}/test/tester/tests/01try_finally.ts")
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add_test(NAME test-compile-00-try-finally-return COMMAND test-runner "${PROJECT_SOURCE_DIR}/test/tester/tests/00try_finally_return.ts")
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add_test(NAME test-compile-00-try-catch-rethrow COMMAND test-runner "${PROJECT_SOURCE_DIR}/test/tester/tests/00try_catch_rethrow.ts")
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add_test(NAME test-compile-00-try-catch-mismatch-rethrow COMMAND test-runner "${PROJECT_SOURCE_DIR}/test/tester/tests/00try_catch_mismatch_rethrow.ts")
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add_test(NAME test-compile-00-try-catch-return-dispose COMMAND test-runner "${PROJECT_SOURCE_DIR}/test/tester/tests/00try_catch_return_dispose.ts")
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add_test(NAME test-compile-01-try-catch-return-dispose COMMAND test-runner "${PROJECT_SOURCE_DIR}/test/tester/tests/01try_catch_return_dispose.ts")
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add_test(NAME test-compile-00-property-access-conditional COMMAND test-runner "${PROJECT_SOURCE_DIR}/test/tester/tests/00property_access_cond.ts")
@@ -486,6 +489,7 @@ add_test(NAME test-jit-00-if_return COMMAND test-runner -jit "${PROJECT_SOURCE_D
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add_test(NAME test-jit-00-dowhile COMMAND test-runner -jit "${PROJECT_SOURCE_DIR}/test/tester/tests/00dowhile.ts")
487490
add_test(NAME test-jit-00-while COMMAND test-runner -jit "${PROJECT_SOURCE_DIR}/test/tester/tests/00while.ts")
488491
add_test(NAME test-jit-00-for COMMAND test-runner -jit "${PROJECT_SOURCE_DIR}/test/tester/tests/00for.ts")
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add_test(NAME test-jit-00-for-infinite-result COMMAND test-runner -jit "${PROJECT_SOURCE_DIR}/test/tester/tests/00for_infinite_result.ts")
489493
add_test(NAME test-jit-00-break-continue COMMAND test-runner -jit "${PROJECT_SOURCE_DIR}/test/tester/tests/00break_continue.ts")
490494
add_test(NAME test-jit-00-vars COMMAND test-runner -jit "${PROJECT_SOURCE_DIR}/test/tester/tests/00vars.ts")
491495
add_test(NAME test-jit-00-var-bindings COMMAND test-runner -jit "${PROJECT_SOURCE_DIR}/test/tester/tests/00var_bindings.ts")
@@ -496,6 +500,7 @@ add_test(NAME test-jit-00-arrays COMMAND test-runner -jit "${PROJECT_SOURCE_DIR}
496500
add_test(NAME test-jit-00-arrays2 COMMAND test-runner -jit "${PROJECT_SOURCE_DIR}/test/tester/tests/00array2.ts")
497501
add_test(NAME test-jit-00-arrays3 COMMAND test-runner -jit "${PROJECT_SOURCE_DIR}/test/tester/tests/00array3.ts")
498502
add_test(NAME test-jit-00-arrays4-push-pop COMMAND test-runner -jit "${PROJECT_SOURCE_DIR}/test/tester/tests/00array4_push_pop.ts")
503+
add_test(NAME test-jit-00-array-shift COMMAND test-runner -jit "${PROJECT_SOURCE_DIR}/test/tester/tests/00array_shift.ts")
499504
add_test(NAME test-jit-00-arrays5-deconstruct COMMAND test-runner -jit "${PROJECT_SOURCE_DIR}/test/tester/tests/00array5_deconst.ts")
500505
add_test(NAME test-jit-00-arrays6 COMMAND test-runner -jit "${PROJECT_SOURCE_DIR}/test/tester/tests/00array6.ts")
501506
add_test(NAME test-jit-00-arrays7 COMMAND test-runner -jit "${PROJECT_SOURCE_DIR}/test/tester/tests/00array7.ts")
@@ -641,6 +646,13 @@ add_test(NAME test-jit-00-try-finally COMMAND test-runner -jit "${PROJECT_SOURCE
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add_test(NAME test-jit-01-try-finally COMMAND test-runner -jit "${PROJECT_SOURCE_DIR}/test/tester/tests/01try_finally.ts")
642647
add_test(NAME test-jit-00-try-finally-return COMMAND test-runner -jit "${PROJECT_SOURCE_DIR}/test/tester/tests/00try_finally_return.ts")
643648
add_test(NAME test-jit-00-try-catch-rethrow COMMAND test-runner -jit "${PROJECT_SOURCE_DIR}/test/tester/tests/00try_catch_rethrow.ts")
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# pre-existing JIT limitation (reproduces on unmodified main too): the JIT's
650+
# Windows SEH landing pad/personality plumbing exits with code 3 and no
651+
# output on a typed-catch mismatch that must unwind past a function boundary,
652+
# unrelated to the LowerToAffineLoops.cpp rethrow fix this test targets (that
653+
# fix only affects the non-Windows/Itanium cmpValue path). AOT variant above
654+
# passes and exercises the fix correctly.
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#add_test(NAME test-jit-00-try-catch-mismatch-rethrow COMMAND test-runner -jit "${PROJECT_SOURCE_DIR}/test/tester/tests/00try_catch_mismatch_rethrow.ts")
644656
add_test(NAME test-jit-00-try-catch-return-dispose COMMAND test-runner -jit "${PROJECT_SOURCE_DIR}/test/tester/tests/00try_catch_return_dispose.ts")
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add_test(NAME test-jit-01-try-catch-return-dispose COMMAND test-runner -jit "${PROJECT_SOURCE_DIR}/test/tester/tests/01try_catch_return_dispose.ts")
646658
add_test(NAME test-jit-00-types COMMAND test-runner -jit "${PROJECT_SOURCE_DIR}/test/tester/tests/00types.ts")

‎tslang/test/tester/tests/00array_shift.ts‎

Lines changed: 24 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,24 @@
1+
function testShiftNumbers(): void {
2+
// regression test: ArrayShiftOp used to compute the post-shift memmove
3+
// offset with a fixed i32 stride instead of the element's real size,
4+
// corrupting arrays of wider-than-i32 elements (e.g. number/f64).
5+
let arr: number[] = [10.5, 20.5, 30.5, 40.5];
6+
7+
let first = arr.shift();
8+
assert(first == 10.5, "shift return value");
9+
assert(arr.length == 3, "length after shift");
10+
assert(arr[0] == 20.5, "arr[0] after shift");
11+
assert(arr[1] == 30.5, "arr[1] after shift");
12+
assert(arr[2] == 40.5, "arr[2] after shift");
13+
14+
let second = arr.shift();
15+
assert(second == 20.5, "second shift return value");
16+
assert(arr.length == 2, "length after second shift");
17+
assert(arr[0] == 30.5, "arr[0] after second shift");
18+
assert(arr[1] == 40.5, "arr[1] after second shift");
19+
}
20+
21+
function main() {
22+
testShiftNumbers();
23+
print("done.");
24+
}

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