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Commits
| Author | SHA1 | Message | Date | |
|---|---|---|---|---|
|
9181dd1ef3 |
fix(extraction): land upstream declaration initializer walks (#1511) (#1802)
Squash danusha2345's PR #1511 at |
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|
Colby Mchenry
|
838006c947 |
fix(kernel): guard the native walkers against stack overflow and defer deep files to wasm (#1581) (#1600)
Fixes #1581.
## What was wrong
`codegraph init` / `codegraph index` died with `Segmentation fault` — the whole CLI
process, not a parse worker — on a C/C++ file with very deep brace nesting (llvm's
`clang/test/Parser/parser_overflow.c`, 16,384 nested `{`). The reporter's diagnosis is
exactly right: tree-sitter's parser is iterative, so the file parses fine, and then the
native kernel's **recursive walker** (`visit_node` → `visit_for_calls_and_structure` → …,
one frame per AST level) overflowed the thread's stack. A native overflow can't be caught
the way a wasm abort can, and a parse worker is a thread of the `codegraph` process, so
the SIGSEGV took the entire indexer down — no message, no per-file fallback, no partial
index.
Two things made "just give the worker a bigger stack" the wrong fix:
- it only moves the cliff — reproduced here: the reporter's 16,384-deep file kills a
default 4 MiB worker (rc=132 on macOS / 139 on Linux), and a 100k-deep file kills the
8 MiB **main** thread too;
- the walkers are shared by every kernel-routed language (20 of them), and each has
several recursion points with different frame sizes, so no single stack size is a
provable bound.
Meanwhile the wasm path already handles this shape gracefully: its JS walker catches its
own `RangeError` per file and stores a partial result with a `parse_error`. The kernel
just needed a way to get there instead of dying.
## What this does
**The kernel guards its own recursion against the calling thread's real stack bounds and
defers a too-deep file to wasm** — the same `defer:` routing signal it already uses for
files with parse errors, which `src/extraction/kernel/index.ts` treats as "take the wasm
path for this file", silently.
- `codegraph-kernel/src/stack.rs`: per-thread stack bounds from the OS, computed once per
thread and cached — glibc/musl `pthread_getattr_np` + `pthread_attr_getstack`, macOS
`pthread_get_stackaddr_np` + `pthread_get_stacksize_np`, Win32
`GetCurrentThreadStackLimits` (a hand-declared `kernel32` extern; no `windows-sys`).
`exhausted()` is one thread-local load and one compare: true once the stack pointer is
within a 256 KiB red zone of the limit, and it latches a flag. Where the OS can't report
bounds it falls back to a fixed 1 MiB descent budget measured from the entry stack
pointer — safe on anything from Node's 4 MiB worker default up. So the guard is exact on
the 4 MiB worker, the 8 MiB main thread, and any `resourceLimits.stackSizeMb` alike.
- `stack_guard!()` (defined in `lib.rs`) is the first statement of every recursive walker
function — all **150** self-recursive or on-cycle functions across the 15 walker modules,
found by script (every cycle in the call graph, not just direct self-calls). It returns
`Default::default()` (`()`, `false`, `None`, `""`) so an exhausted walk simply stops
descending; a hook returning `false` sends its caller down the generic child walk, whose
own guard returns at once.
- `extract_file` runs the whole walk under `stack::run_guarded`: if the flag is set
afterwards the (truncated) result is discarded and replaced by
`defer: nesting too deep for the native walker — wasm recovery handles it`.
- `parse-pool.ts`: a comment at `new Worker(scriptPath)` records why there is deliberately
no `resourceLimits.stackSizeMb` bump.
- No new crates beyond `libc` as a direct unix dependency (already in `Cargo.lock`
transitively). No wire/ABI change.
Net effect for the reporter's repo: `deep.c` goes to the wasm path, lands as
`function foo` plus a recorded parse warning, and the other 31,607 files index normally.
`CODEGRAPH_KERNEL=0` and the `exclude` workaround are no longer needed.
## Tests
**Rust unit tests** (`cargo test`, 21 passed — 7 new in `stack.rs`): the walkers for
C, C++, Rust, TypeScript and Python are driven on a **1 MiB** thread (a quarter of Node's
worker default) with 30k-deep nesting and must return `defer:` instead of crashing;
shallow files are untouched; the latch resets between runs; the OS bounds are sane on the
main thread and describe a small thread's own stack.
**`__tests__/kernel-deep-nesting.test.ts`** (new, 8 tests — skips without a staged `.node`,
fails under `CODEGRAPH_KERNEL_EXPECT=1` if the kernel is missing, like the other kernel
suites):
- every default-routed language (all 20) survives a 60k-deep expression on the main thread
— clean result or the wasm fallback's partial result, never a crash;
- the reporter's exact 16,384-brace C file is indexed (partial) on the main thread;
- 200-deep expressions in every language still take the kernel path clean (the guard never
trips on normal code);
- inside a **default-sized 4 MiB `worker_threads` Worker** through `dist/`: the reporter's
`deep.c` and a 60k-deep expression in every language come back `deferred` with exit 0,
and a normal file still extracts natively;
- end-to-end through the built CLI: `codegraph init` on a repo holding `deep.c` + `ok.c`
exits 0 and records both files, with both functions.
**Existing kernel suites**: all 15 (`kernel-*-parity`, `kernel-scaffold`,
`kernel-retry-materialize`, `kernel-grammar-parity`) pass unchanged, 147 tests — the guard
never fires on the parity fixtures.
**Reporter's probes** (`one.js` from the issue, default 4 MiB worker, this build):
`deep.c` → `deferred`, exitCode=0 (was rc=132/139); `deep100k.c` → `deferred`, exitCode=0.
Main thread: `deep.c` / `deep100k.c` → wasm partial with
`Parse error: Maximum call stack size exceeded`; a 6,000-term binary expression and a
3,000-branch `else if` chain stay on the kernel path with clean results.
**Perf** (same `dist/`, only the `.node` swapped via `CODEGRAPH_KERNEL_PATH`; interleaved
main/new ×3, `codegraph init`, macOS arm64):
| repo | main (median) | guarded (median) | nodes / edges |
|---|---|---|---|
| express (141 files) | 0.60 s (0.58–0.65) | 0.61 s (0.58–0.61) | 1,084 / identical |
| redis (786 C/H files) | 4.44 s (4.39–4.66) | 4.49 s (4.41–4.70) | 19,942 / 76,446 identical |
Within run-to-run noise, as expected for one TLS load + compare per recursion entry.
**Linux (Docker, `node:22-bookworm`, kernel built in-container, `docker run --rm --init`)** —
the reporter's platform and the glibc `pthread_getattr_np` bounds path:
```
=== platform ===
Linux efe3cc86947b 6.12.54-linuxkit #1 SMP Tue Nov 4 21:21:47 UTC 2025 aarch64 GNU/Linux
v22.22.3
-rwxr-xr-x 1 root root 35332288 Aug 22 18:02 codegraph-kernel/prebuilds/linux-arm64/codegraph-kernel.node
=== reporter repro (issue #1581): 16,384-brace deep.c, codegraph init ===
│
└ Done
init exit code: 0
file: deep.c
file: deep100k.c
file: ok.c
function: add
function: bar
function: foo
=== worker probe: kernel raw extract in a default 4 MiB worker ===
deep.c: deferred
deep.c: worker exitCode=0
deep100k.c: deferred
deep100k.c: worker exitCode=0
ok.c: kernel nodes=2
ok.c: worker exitCode=0
=== cargo test stack:: (glibc pthread_getattr_np bounds path) ===
test stack::tests::os_bounds_are_sane_on_this_platform ... ok
test stack::tests::small_stack_reports_its_own_bounds ... ok
test stack::tests::normal_files_are_untouched_by_the_guard ... ok
test stack::tests::deep_braces_c_defer_instead_of_crashing ... ok
test stack::tests::latch_resets_between_runs ... ok
test stack::tests::deep_parens_cpp_rust_ts_python_defer_instead_of_crashing ... ok
test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 15 filtered out; finished in 0.23s
=== vitest: kernel-deep-nesting + kernel-scaffold ===
✓ __tests__/kernel-scaffold.test.ts (10 tests) 30ms
✓ __tests__/kernel-deep-nesting.test.ts (8 tests) 36989ms
Test Files 2 passed (2)
Tests 18 passed (18)
```
(The pre-fix crash was reproduced on macOS — rc=132 in a default worker, rc=139 on the main thread at 100k depth — not re-run inside this container; the reporter's Linux x86_64 trace is the SIGSEGV form of the same overflow.)
**Windows (Parallels ARM64 VM, MSVC 14.44, `cargo 1.97`, kernel built on the VM,
`GetCurrentThreadStackLimits` path)**:
```
head:
|
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Colby MchenryandClaude Fable 5
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bdd687b49f |
feat(kernel): R7b Scala walker — scala module, vendored-grammar-C master@0aca5d0a6f, scala default-routed (#1385)
R7b batch 4 #3 (docs/design/scala-kernel-port-checklist.md is the authoritative quirk list). The third vendored-grammar-C language and the biggest grammar in the tree (35MB parser.c): the vendored wasm is tree-sitter/tree-sitter-scala master@0aca5d0a6f — a post-v0.26.0 generation sync that is not a release (the 0.26.0 crate is 30 states BEHIND, so a crate pin would be a silent downgrade). NO wasm change: production has parsed with this exact revision since #91 — the kernel-grammar-parity row (ABI 15, 26,650 states, 32 fields, id-by-id tables) is the whole alignment proof. Preserved bug-for-bug (all probe-pinned): the leak-through asymmetries — extension methods mint NO nodes (first def's body calls leak to the enclosing scope, later defs invisible, and the braced form resolves its body field to the `{` TOKEN via first-match-wins field lookup → whole extension invisible); anonymous `new T { … }` template_body members leak to the enclosing scope (findAnonymousClassBody misses template_body); the bodied-vs-bodiless class asymmetry (bodiless headers walk class_parameters → default-value calls emit FROM the class; bodied ones never see them) — plus first-segment import names (`import com.example.C` → `com`), the val/var hook keyed on the enclosing-definition NODE TYPE (object vals → constants/value-ref targets, class/trait/enum/given vals → fields) with consumed initializers, every def routed through extractMethod with the top-level function fallback, nested defs in bodies minting NOTHING (the inverse of kotlin) while body-local classes extract fully, curried signatures keeping only the FIRST parameter list (type params win the `parameters` field), enum cases positioned at the CASE node with invisible params/extends tails, extends with-chains via scalaBaseTypeName, `@deprecated(args)` decorates, the #750 capitalized-chain re-encode (`WidgetS.create().render`), literal-receiver silence, static-member reads AND writes, infix invisibility, `derives` silence, scaladoc retention with the CRLF `\r` pin, full value-reference machinery (shadow prune, last-wins same-name targets, `$X`/`${X}` interpolation reads), and SCALA_SPEC fn-refs (bare ids + postfix eta unwrap + varinit, var-init non-capture). Gates: parity sweeps first-run 0-diff on os-lib/cats/scala3-compiler-src/ scala3-library-src — 1,935 clean files byte-parity, deferrals 0/15/57/116 matching the survey's predictions exactly (scala-3's PHANTOM hasError files — flag-true, zero ERROR nodes, capture-checking `^` — defer on the FLAG); full-init dumps byte-identical ×3 (os-lib, cats, scala3 whole-repo 950,889 dump lines); kernel-scala-parity suite (9 fixtures + 9 in-memory CRLF variants incl. Scala-3 indentation through the external scanner + phantom/real-error defer pins + first-segment/namespace/value-ref pins); full suite 2,669 green ×3 with CODEGRAPH_KERNEL_EXPECT=1 (kernel-scaffold's stays-wasm example moved scala → pascal). DEFAULT_ROUTED += scala (19 langs). Co-authored-by: Claude Fable 5 <noreply@anthropic.com> |