fix(compile): always keep the keep-alive anchors in the auto-optimize runtime - #8338
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proggeramlug merged 1 commit intoAug 18, 2026
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PerryTS#6917 gated the ~490 #[used] keep-alive anchor statics behind the keepalive-anchors feature and only enabled it for the bitcode-LTO path (PERRY_LLVM_BITCODE_LINK=1). The assumption was that the classic link path "keeps every reachable runtime symbol via real undefined references from the program's objects." That assumption is wrong: #[no_mangle] pub extern "C" fn symbols that are only called from codegen (not from within the perry-runtime crate itself) are dead-code-eliminated by rustc during staticlib archive creation when no #[used] anchor pins them. The resulting libperry_runtime.a is missing core symbols — js_box_release, js_bool_box_release, js_closure_set_box_capture_ptr, js_link_path_module_parent — and programs whose codegen emits calls to them fail to link with "Undefined symbols for architecture arm64." This blocks sdxgen and any program whose codegen references these codegen-only entry points. Fix: always include perry-runtime/keepalive-anchors in the auto-optimize cross-feature set (not just when PERRY_LLVM_BITCODE_LINK=1). In a staticlib archive the linker only pulls in object files that resolve an undefined reference, so #[used] anchors only become -dead_strip roots when their object file is pulled in — the size cost is limited to the transitive callees of symbols the program actually uses, not the entire runtime surface. Also update the cache key's anchors field to always true (was PERRY_LLVM_BITCODE_LINK == "1") so old incomplete archives get new hash dirs and are never reused.
📝 WalkthroughWalkthroughThe compiler now always enables ChangesKeepalive anchor feature wiring
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: 🔵 Low · up to The PR fixes missing runtime symbols and adds regression coverage. One test still changes process environment variables without shared synchronization, which could make concurrent test runs flaky; the PR is otherwise mergeable with explicit owner follow-up. Possibly related PRs
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In `@crates/perry/src/commands/compile/optimized_libs/tests.rs`:
- Around line 1084-1101: Update
optional_framework_dir_tests::env_var_takes_precedence_over_perry_toml and the
auto_optimize_keepalive_anchors_not_bitcode_only test to serialize every
std::env reader and writer using the shared env_lock(), or isolate the test in a
subprocess. Ensure direct set_var, remove_var, and environment reads cannot run
concurrently anywhere in the test binary.
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crates/perry-runtime/Cargo.tomlcrates/perry/src/commands/compile/optimized_libs/freshness.rscrates/perry/src/commands/compile/optimized_libs/tests.rs
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This was referenced Aug 18, 2026
proggeramlug
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#8337 landed from a fork branch with cargo fmt --check failing on no_auto.rs and tests.rs. Verified this is the branch's own formatting and not the #8338 merge: clean main was fmt-clean and #8337 alone still failed, including no_auto.rs which #8338 never touched. Co-authored-by: Ralph Küpper <ralph3@skelpo.com>
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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).
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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).
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 a link failure where the auto-optimize runtime/stdlib rebuild produces an incomplete
libperry_runtime.amissing core symbols (_js_box_release,_js_bool_box_release,_js_closure_set_box_capture_ptr,_js_link_path_module_parent), so programs whose codegen emits calls to them fail withUndefined symbols for architecture arm64. Blocks sdxgen and any program on the auto-optimize path.Root cause — not a stale cache
Not a freshness-cache issue (that path is sound: a no-edit rebuild reuses the archive, a source-edit rebuild rebuilds it). It's a feature-exclusion/DCE bug introduced by #6917: that PR gated all ~490
#[used]keep-alive anchor statics behind akeepalive-anchorsfeature and only enabled it for the bitcode-LTO path, on the assumption that the classic link path "keeps every reachable runtime symbol via real undefined references from the program's objects."That assumption is wrong.
#[no_mangle] pub extern "C" fnsymbols called only from codegen (not from within theperry-runtimecrate) are dead-code-eliminated by rustc during staticlib archive creation when no#[used]anchor pins them. The resulting archive drops those symbols.Fix
Always include
perry-runtime/keepalive-anchorsin the auto-optimize cross-feature set (optimized_libs/freshness.rs), and update the cache key'sanchorsfield to alwaystrueso old incomplete archives get new hash dirs. Two regression tests added.Verification
Tsymbols vs 5555 before).cargo test -p perry --bin perry: 991 passed, 0 failed.cargo test -p perry-runtime --lib: 2579 passed, 0 failed.Summary by CodeRabbit
Bug Fixes
Documentation
Tests