From: Kouhei Sutou <kou@...>
Date: 2013-05-15T21:56:31+09:00
Subject: [ruby-core:55007] Re: [ruby-trunk - Bug #8399] Remove usage of RARRAY_PTR in C extensions when not needed

Hi,

In <519344E0.7020208@atdot.net>
  "[ruby-core:55004] Re: [ruby-trunk - Bug #8399] Remove usage of RARRAY_PTR in C extensions when not needed" on Wed, 15 May 2013 17:18:40 +0900,
  SASADA Koichi <ko1@atdot.net> wrote:

>   (3) I think RARRAY_PTR() is needed in a few cases for performance and
>       usability with C functions.
>       I want to introduce RARRAY_PTR_USE(ary, ptr, expr).
>         /* example code */
>         RARRAY_PTR_USE(ary, ptr, {
>           memset(ptr, 0, RARRAY_LEN(ary));
>         });
>       In this macro, we can observe that `ptr' is live only in `expr'.

As a GDB user, surrounding expressions type macro is not debugger
friendly. I can't run step by step with "next" GDB command.

I don't oppose it strongly. I'm happy that not surrounding
expressions type macro is also ready like:

  RARRAY_PTR_USE_BEGIN(ary, ptr);
  memset(ptr, 0, RARRAY_LEN(ary));
  RARRAY_PTR_USE_END(ary);


Thanks,
--
kou