Re: LuaJIT 2 clone-on-write for tables

[Alexander Gladysh <agladysh@...>]

On Wed, Jan 19, 2011 at 22:05, Mike Pall <mikelu-1101@mike.de> wrote:
> Alexander Gladysh wrote:
>> On Wed, Jan 19, 2011 at 21:46, Tony Finch <dot@dotat.at> wrote:
>> > You can do that with a proxy table. Point __index at the table to be
>> > cloned, and when __newindex is called, copy everything to the proxy.

>> Thank you. As I noted in my original post, I'm aware of that solution.

>> My question is about LJ2 optimizations.

> Well, this is at the wrong level for a compiler optimization. How
> could it do better than that? It would have to do exactly the same
> things behind the curtains. It's not the compiler's business to
> handle stuff you can do at the user level with similar efficiency.

Ok, fair enough.

> [And I'm pretty sure it doesn't pay off either way. Rethink the
> whole thing and find easier ways to do what you're really trying
> to achieve. This sounds a lot like architecture astronautics.]

Quite possibly so.

Anyway, I need to get whole thing working first and then do some
profiling. I'm at the "get it working, no matter how" prototyping
stage so far.

Alexander.