From: Nobuyoshi Nakada <nobu@...>
Date: 2015-03-12T22:00:23+09:00
Subject: [ruby-core:68508] Re: Seven stacks (and two questions)

On 2015/03/12 19:15, Jakub Trzebiatowski wrote:
> The Ruby Hacking Guide says that Ruby has��� seven stacks. Is it an
> implementation choice (and it could be implemented with one stack),
> or is there really a need for seven logical stacks? For example, Lua
> has one stack, and still closures with upvalues are totally possible
> (it���s like Ruby���s blocks that can reference local variables of
> their enclosing method, but it works for any function with any
> upvalues).

RHG is a good book, but quite old for the core implementation.

> 2. When does Ruby generate `getdynamic` YARV opcode? Could you
> provide me with an example source code? (I really tried to make Ruby
> generate it. No results.)

No such instruction in YARV.
Do you mean `getlocal`?

-- 
Nobu Nakada