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Re: What is "fnspec function type attribute"?

From: Marc Glisse <marc dot glisse at inria dot fr>
To: FX <fxcoudert at gmail dot com>
Cc: GCC Development <gcc at gcc dot gnu dot org>, gfortran <fortran at gcc dot gnu dot org>
Date: Fri, 6 Jun 2014 22:24:27 +0200 (CEST)
Subject: Re: What is "fnspec function type attribute"?
Authentication-results: sourceware.org; auth=none
References: <D9AA3F44-CF35-4915-B152-B952C4B95933 at gmail dot com>
Reply-to: gcc at gcc dot gnu dot org

On Fri, 6 Jun 2014, FX wrote:

In fortran/trans-decl.c, we have a comment above the code building function decls, saying:

   The SPEC parameter specifies the function argument and return type
   specification according to the fnspec function type attribute.  */


I was away from GCC development for some time, so this is news to me. The syntax is not immediately clear, and neither a Google search nor a grep of the trunkʼs numerous .texi files reveals any information. Iʼm creating new decls, what I am to do with it?

You can look at the 2 functions in gimple.c that use gimple_call_fnspec,and refer to tree-core.h for the meaning of EAF_*, etc. A string like"2x." means:'2': the first letter is about the return, here we are returning thesecond argument

'x': the first argument is ignored
'.': not saying anything about the second argument.

--
Marc Glisse

References:
- What is "fnspec function type attribute"?
  - From: FX

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