Host reject to freeze?

It might be possible there is a host API like this:

const process = new Process('./native.so')
process.memory instanceof ArrayBuffer
process.memory.transferToImmutable() // or .detach()

Is this a case we want the host to be able to reject the detached behavior? (This also affects other APIs like transfer actually).

I'm confused, how would this not work out of the box? If it's actually a proper instance of ArrayBuffer, then it'd be detachable; if it's not detachable, then it's not a proper instance of ArrayBuffer.

I'm confused, how would this not work out of the box? If it's actually a proper instance of ArrayBuffer, then it'd be detachable; if it's not detachable, then it's not a proper instance of ArrayBuffer.

I mean, if there is a case that the host wants to reject the AB being detachable. this is like HostEnsureCanAddPrivateElement that limits the ability of adding a private field to a host object.

Why would we want to consider a host hook when no use case for that has presented itself?

I'm confused, how would this not work out of the box? If it's actually a proper instance of ArrayBuffer, then it'd be detachable; if it's not detachable, then it's not a proper instance of ArrayBuffer.

Why would we want to consider a host hook when no use case for that has presented itself?

Host buffers can already be non-detachable/transferable via [[ArrayBufferDetachKey]], e.g. WebAssembly.Memory can't be transfered/detached (except via other WebAssembly methods, e.g. mem.grow does detach the previous buffer):

const mem = new WebAssembly.Memory({ initial: 1 });
// Throws a TypeError
const newBuffer = mem.buffer.transfer();
const oldBuffer = mem.buffer;
mem.grow(1);
// Now detached
oldBuffer.detached; // true
oldBuffer === mem.buffer; // false

const mem = new WebAssembly.Memory({ initial: 1, maximum: 1 });
// Not detachable by any means
mem.buffer;

I don't see that this proposal needs anything special, if a host buffer can't be transfered to an immutable buffer then they can just set [[ArrayBufferDetachKey]] and provide a separate API.

Thank you! This is first time I learn ArrayBufferDetachKey

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Host reject to freeze? #20

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ljharb commented on Dec 24, 2024

Jack-Works commented on Dec 25, 2024

ljharb commented on Dec 25, 2024

Jamesernator commented on Dec 26, 2024

Jack-Works commented on Dec 26, 2024

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