fix(object): stop returning the native-module sentinel as a class ref from Object.getPrototypeOf - #8369
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proggeramlug merged 1 commit intoAug 18, 2026
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…ntinel (-2)
Object.create(proto) where proto is a native-module namespace object
(class_id = NATIVE_MODULE_CLASS_ID = 0xFFFFFFFE) registered the sentinel
as the synthetic class's parent via register_class. Later,
Object.getPrototypeOf on that synthetic class's ref (returned by
instance.constructor) walked the parent chain and returned the raw
sentinel as an INT32-tagged class ref (-2). Object.create(-2) then
threw TypeError: Object prototype may only be an Object or null: -2.
This was the blocker for sdxgen --help: rolldown's __toESM calls
Object.create(Object.getPrototypeOf(mod)) on built-in module namespaces,
and a prior Object.create(builtin_namespace) in the same module
(isPlainObject/deepMerge path in external-pack.js) seeded the bad
parent registration.
Fix in two layers:
1. js_object_create: skip register_class when the proto's class_id is
NATIVE_MODULE_CLASS_ID — it is a sentinel, not a real declared class.
The synthetic class's prototype is already stored in
CLASS_PROTOTYPE_OBJECTS by class_prototype_object_root_store, which
is what getPrototypeOf reads.
2. js_object_get_prototype_of (class-ref branch): defensively skip
returning NATIVE_MODULE_CLASS_ID as a class ref, treating it as a
root whose [[Prototype]] is Object.prototype. This catches any
pre-existing or alternative registration path.
Regression tests:
- cjs_wrap_object_create_on_builtin_namespace_get_prototype_of_not_sentinel:
the minimal witness (Object.create(require('process')) → .constructor →
getPrototypeOf → Object.create) that threw -2 pre-fix.
- cjs_wrap_rolldown_toesm_after_object_create_on_builtin_namespace:
the full rolldown __toESM shape interleaved with the
Object.create(builtin) that seeds the sentinel parent.
Refs PerryTS#8343 (CJS-wrap bug stack: alias blanking → HIR drop → this).
📝 WalkthroughWalkthroughThe runtime now treats the native-module sentinel as a prototype hierarchy root. Regression tests cover built-in namespace prototype operations and rolldown ChangesPrototype sentinel handling
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: 🔵 Low · up to The runtime change prevents native-module prototype sentinels from being returned as invalid class references, resolving the reported TypeError. Merge is reasonable with owner awareness that the regression test should also invoke __toESM on the synthetic constructor path to guard against reintroducing this failure. Suggested reviewers: 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In `@crates/perry/tests/cjs_wrap_builtin_require.rs`:
- Around line 225-237: Update the test to call __toESM with the synthetic
constructor reference ctor before wrapping node_os, ensuring the changed
class-reference path in js_object_get_prototype_of is exercised while preserving
the existing os.cpus assertion.
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jdalton
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…ort bindings Follow-up to PerryTS#8341, PerryTS#8343, PerryTS#8369, and PerryTS#8338 addressing review findings on the merged cjs-wrap builtin-require chain. * Generate the __perry_cjs_require_is_builtin switch cases from the shared perry_hir::NODE_BUILTIN_MODULES table instead of a hardcoded list. The hardcoded list omitted 16 entries (tls, dgram, diagnostics_channel, domain, fs/promises, inspector, inspector/promises, repl, stream/consumers, stream/web, trace_events, v8, vm, wasi, sea, sqlite), so a computed require(specifier) for one of those fell through to compiled-module resolution and raised MODULE_NOT_FOUND instead of routing through createRequire. Re-export NODE_BUILTIN_MODULES from perry-hir so the perry crate can build the predicate. * Back built-in named re-exports with _cjs.<name> instead of the dropped import _req_N binding. PerryTS#8343 stopped hoisting `import _req_N from '<builtin>'`, but direct_named_reexports still emitted `export { _req_N as name }` for `exports.name = require('<builtin>')`, referencing an undeclared ESM binding. The IIFE body populates _cjs.name via the synthetic require's createRequire arm, so the re-export now reads that, matching named_export_decls. * Match the complete normalized specifier (fs/promises, path/win32) rather than the truncated base name when classifying built-ins, so unsupported subpaths such as fs/unknown fall through to compiled- module resolution instead of being routed to createRequire. * Route the rolldown __toESM regression test through the synthetic class reference (ctor) so Object.getPrototypeOf(ctor) takes the class-id-tagged branch the sentinel-suppression fix changed; without it the heap-pointer path hid a regression. * Use std::path::MAIN_SEPARATOR in the builtin-require test assertions so path.join('a','b') expectations hold on Windows. * Serialize env mutation in optional_framework_dir_tests::env_var_takes_precedence_over_perry_toml with the shared env_lock() so it cannot race the other env-touching tests in the same binary. Add a regression test for computed require of a previously-missing built-in (domain).
jdalton
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to jdalton/perry
that referenced
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Aug 18, 2026
…ort bindings Follow-up to PerryTS#8341, PerryTS#8343, PerryTS#8369, and PerryTS#8338 addressing review findings on the merged cjs-wrap builtin-require chain. * Generate the __perry_cjs_require_is_builtin switch cases from the shared perry_hir::NODE_BUILTIN_MODULES table instead of a hardcoded list. The hardcoded list omitted 16 entries (tls, dgram, diagnostics_channel, domain, fs/promises, inspector, inspector/promises, repl, stream/consumers, stream/web, trace_events, v8, vm, wasi, sea, sqlite), so a computed require(specifier) for one of those fell through to compiled-module resolution and raised MODULE_NOT_FOUND instead of routing through createRequire. Re-export NODE_BUILTIN_MODULES from perry-hir so the perry crate can build the predicate. * Back built-in named re-exports with _cjs.<name> instead of the dropped import _req_N binding. PerryTS#8343 stopped hoisting `import _req_N from '<builtin>'`, but direct_named_reexports still emitted `export { _req_N as name }` for `exports.name = require('<builtin>')`, referencing an undeclared ESM binding. The IIFE body populates _cjs.name via the synthetic require's createRequire arm, so the re-export now reads that, matching named_export_decls. * Match the complete normalized specifier (fs/promises, path/win32) rather than the truncated base name when classifying built-ins, so unsupported subpaths such as fs/unknown fall through to compiled- module resolution instead of being routed to createRequire. * Route the rolldown __toESM regression test through the synthetic class reference (ctor) so Object.getPrototypeOf(ctor) takes the class-id-tagged branch the sentinel-suppression fix changed; without it the heap-pointer path hid a regression. * Use std::path::MAIN_SEPARATOR in the builtin-require test assertions so path.join('a','b') expectations hold on Windows. * Serialize env mutation in optional_framework_dir_tests::env_var_takes_precedence_over_perry_toml with the shared env_lock() so it cannot race the other env-touching tests in the same binary. Add a regression test for computed require of a previously-missing built-in (domain).
proggeramlug
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Aug 18, 2026
…ort bindings (#8380) Follow-up to #8341, #8343, #8369, and #8338 addressing review findings on the merged cjs-wrap builtin-require chain. * Generate the __perry_cjs_require_is_builtin switch cases from the shared perry_hir::NODE_BUILTIN_MODULES table instead of a hardcoded list. The hardcoded list omitted 16 entries (tls, dgram, diagnostics_channel, domain, fs/promises, inspector, inspector/promises, repl, stream/consumers, stream/web, trace_events, v8, vm, wasi, sea, sqlite), so a computed require(specifier) for one of those fell through to compiled-module resolution and raised MODULE_NOT_FOUND instead of routing through createRequire. Re-export NODE_BUILTIN_MODULES from perry-hir so the perry crate can build the predicate. * Back built-in named re-exports with _cjs.<name> instead of the dropped import _req_N binding. #8343 stopped hoisting `import _req_N from '<builtin>'`, but direct_named_reexports still emitted `export { _req_N as name }` for `exports.name = require('<builtin>')`, referencing an undeclared ESM binding. The IIFE body populates _cjs.name via the synthetic require's createRequire arm, so the re-export now reads that, matching named_export_decls. * Match the complete normalized specifier (fs/promises, path/win32) rather than the truncated base name when classifying built-ins, so unsupported subpaths such as fs/unknown fall through to compiled- module resolution instead of being routed to createRequire. * Route the rolldown __toESM regression test through the synthetic class reference (ctor) so Object.getPrototypeOf(ctor) takes the class-id-tagged branch the sentinel-suppression fix changed; without it the heap-pointer path hid a regression. * Use std::path::MAIN_SEPARATOR in the builtin-require test assertions so path.join('a','b') expectations hold on Windows. * Serialize env mutation in optional_framework_dir_tests::env_var_takes_precedence_over_perry_toml with the shared env_lock() so it cannot race the other env-touching tests in the same binary. Add a regression test for computed require of a previously-missing built-in (domain).
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Fixes
TypeError: Object prototype may only be an Object or null: -2when__toESM'sObject.create(Object.getPrototypeOf(mod))runs on a reified native-module namespace (e.g.require("process")). This is the last blocker in the sdxgen CJS-wrap chain (#8341/#8343 were the prior layers).Where
-2comes fromNATIVE_MODULE_CLASS_ID = 0xFFFFFFFE(as a signed i32,-2) is the sentinelclass_idstamped on every native-module namespace object created byjs_create_native_module_namespace(crates/perry-runtime/src/object/native_module.rs:299).The chain:
Object.create(proto)whereprotois a native-module namespace readsproto.class_idand callsregister_class(synthetic_cid, 0xFFFFFFFE), registering the sentinel as the synthetic class's parent. LaterObject.getPrototypeOfon the synthetic class walks the parent chain, gets0xFFFFFFFE, and returns it as an INT32-tagged class ref (0x7FFE_0000_FFFF_FFFE=-2).Object.create(-2)rejects it.Fix
Two layers in
crates/perry-runtime/src/object/object_ops/prototype.rs:js_object_create(root cause): skipregister_classwhenparent_class_id == NATIVE_MODULE_CLASS_ID— the sentinel is not a real class; the synthetic class's prototype is already inCLASS_PROTOTYPE_OBJECTS.js_object_get_prototype_of(defensive): skip returningNATIVE_MODULE_CLASS_IDas a class ref, treating it as a root — catches any registration path.Verification
Object.create(require("process"))→.constructor→getPrototypeOf→Object.create— passes (wasTypeError: … -2).cargo test -p perry-runtime: 2590 passed, 0 failed (identical to parent).crates/perry/tests/cjs_wrap_builtin_require.rs, both passing.What this does NOT fix (a further blocker, named not hidden)
sdxgen
--helpnow fails withLinkError: WebAssembly.Instance: perry does not support WebAssembly yetatdist/acorn-bindgen.cjs:816— known limitation #6558, a separate wasm-instantiation gap, not this getPrototypeOf bug. The getPrototypeOf bug is fixed; the wasm path is the next blocker and is filed/tracked, not papered over.Summary by CodeRabbit
Bug Fixes
__toESMconversion flow.Tests