From: "naruse (Yui NARUSE)" <naruse@...>
Date: 2013-06-25T19:48:09+09:00
Subject: [ruby-core:55647] [CommonRuby - Feature #8568] Introduce RbConfig value for native word size, to avoid Fixnum#size use


Issue #8568 has been updated by naruse (Yui NARUSE).


The place where word size info should be seems RbConfig, if it is needed.

nobu (Nobuyoshi Nakada) wrote:
> 'pointer' or 'value'?
> 
> I'm curious for what purpose people use that size.
> Pointers are not used usually in ruby, I think.

See #8553
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Feature #8568: Introduce RbConfig value for native word size, to avoid Fixnum#size use
https://bugs.ruby-lang.org/issues/8568#change-40131

Author: headius (Charles Nutter)
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 


Fixnum#size is not really useful to represent native word size across all platforms and implementations. On JRuby, for example, our Fixnum is always represented as a 64-bit Java "long" value, regardless of the underlying native platform. There may be other implementations that fix Fixnum's size to a specific bit width as well. Therefore, using Fixnum#size to determine the size of a word on the underlying native platform is not reliable.

I propose two additions to Ruby:

1. RbConfig value "word_size" for native word size. This could reflect bit size (32, 64) or byte size (4, 8).

2. A constant, somewhere in Ruby, to provide access to this value more directly. I'm not sure where this should go. ObjectSpace::WORD_SIZE?


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