scr_dyn_release returned the last reference of a number or string box to
the free list without scr_cyc_dead, because the release paths never buffer
those boxes. A collector pass can: capture boxes trace their payload, and
scr_xg_release, which settles the cross-generation edges a restricted pass
skipped, calls scr_cyc_on_release on the target whatever its kind. The
pooled block then stayed in its candidate buffer, and the next box that
reused it carried the stale buffer position. Its death swapped another
object into that slot, which corrupted the buffers and crashed a later
scr_cyc_on_dead.
The fast path now takes a buffered box out of its buffer first. The
sanitized runtime does not pool boxes, so only plain builds were affected.
An arm's field check can run a getter that changes the discriminant. The
checked cast now reads the discriminant again after each failed arm;
when its case changed, the tests continue arm by arm after the failed
arm, so the cast picks the arm the arm-by-arm tests pick.
The sanitized self-hosting native-frontend build needs about 15 GB by
itself: its clang compile of the whole frontend under ASan peaks at
10.5 GB beside a 3.8 GB compile in Node. In the 14 GB scope, with the
shard's other work running beside it, the kernel killed that clang
intermittently, so SC5004 reported clang's warnings and no error (SAN
16/20 and 19/20). The scope now caps RAM at 15 GB, still below the
runner's 16 GB, and may still swap past it.
A union parameter's proof covered the union, not its payload: narrowing it
and storing, returning or pushing the result, a narrowed nullish read, and a
store into a nullable-pointer field all counted as projections. That holds
for a boxed union, whose payload is a separate object. A record passed
through a nullable-pointer union is that payload, so forwarding it to such a
callee let a record in its caller's frame escape the frame.
A pointer-wrapped argument now needs a second fact from the callee's union
parameter: its payload stays in place too. The payload is in place when it
is only tested, narrowed for a field read (directly or through the checked
narrowing a field read of a `T | undefined` parameter compiles to), or passed
on to a parameter that is proved in turn. The facts that other arguments use
are unchanged.
Corpus 7663 has callees that push (directly and through a non-null
assertion), default, store in a global record field or a class field, or
pass on the narrowed record, and one that only reads it.
A JavaScript module binding whose initializer joins an untyped value with
a string, number or boolean through `||`, `&&`, `??` or `?:`
(`export const APP_NAME = pkg.appConfig?.name || "app"`) stayed a local of
the module's initializer, so reads from other modules and functions
failed with "a binding form with no lowering". Such initializers now
register the binding in checked-dynamic module storage, like the untyped
initializers they combine.
pi-coding-agent's config.js declares APP_NAME, APP_TITLE and isBundledNode
this way.
Refs #1777.
An `export * from` declaration binds each re-exported name to the binding
of the module that declares it, like a named re-export, so it has no
initialization state of its own. Import cycles whose modules re-export
another member of the cycle this way now compile with the exact cycle
initialization: re-exported names read the same values, and throw the
same temporal dead zone errors, as in Node. `export * as ns` of a cycle
member keeps the SC1016 refusal.
pi-coding-agent's sdk.js (sdk.js → agent-session-runtime.js →
agent-session-services.js → sdk.js) has this shape.
Refs #1777.
Object.getPrototypeOf of an Error answers Error.prototype when the error's view was built from its fields and its prototype is still the object the view was built with. After Object.setPrototypeOf(error, {}), it answers the object that was set.
The native compiler's executable cache restored a linked executable only
on darwin. On Linux every exe build linked again, even when the frontend
and object caches answered the rest of the build.
- The cache now opens on Linux when the linker is a clang driver. One link
with `-v -Wl,-t` lists the driver's linker job and every file the linker
loads; their identities are checked again before an entry is published
and when it is restored.
- On Linux a key's first link only records that it was linked. A later
link of the same key traces and publishes, so a program built once pays
no tracing.
- The key names the runtime pack manifest by its file identity on Linux
instead of by its text.
- The executable and object caches share one digest of the LLVM text.
- Content-addressed entries are hashed once, and identities are compared
by field.
darwin keeps its own driver check, dry run and key.
A quotient x / Math.pow(2, n) divided on every evaluation, and a
division's latency bounds loops that carry the quotient, such as a key
that keeps its low bits with k - Math.floor(k / Math.pow(2, n)) *
Math.pow(2, n). A divisor that is a positive power of two from 2^-1022
to 2^1022 has a reciprocal that is a power of two too, whose bits are
0x7FE0000000000000 minus the divisor's, and the product with it is the
quotient for every dividend. The quotient now multiplies by that
reciprocal when the divisor's bits are such a power, and divides
otherwise.
Corpus 8180 compares the quotient with an ordinary division for every
integer exponent from -1080 to 1030, including divisors that are
subnormal, zero or infinite, and for exponents that are not integers.
A checked cast into a union whose discriminant has four or more string
literals reads the discriminant field once (scr_dyn_discriminant_case)
and then tests only the arms whose literal it holds and the arms without
a literal, in the union's arm order. Every other arm's literal test would
fail, so the arm chosen and the error for a value no arm matches are
unchanged. A typed capsule, an accessor or an inherited discriminant
still takes the tests arm by arm. Unions with fewer literals emit the
same code as before.
Buffer.from(arrayBuffer, byteOffset[, length]) lowers to
buffer.poolFromDynRange with its operands as checked values. The int32
slot analysis treats any runtime helper with a checked-value argument
as a possible store into a live class instance unless the helper is
listed as read-only, so one such call dropped every int32 class field
fact in the program (tsc-ts's scanner makes one).
buffer.poolFromDynRange and buffer.poolFromDynOffset read their
operands (the ArrayBuffer's view after Node's offset and length
conversions, or a copy of a string's, array-like's or typed array's
values) and store into no class instance, so they join DYN_READ_ONLY.
Chris Tate