From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <piotr.krukowiecki@gmail.com>
Received: from mail-pf1-x431.google.com (mail-pf1-x431.google.com
 [IPv6:2607:f8b0:4864:20::431])
 by sourceware.org (Postfix) with ESMTPS id 5F6123857B93
 for <gcc-help@gcc.gnu.org>; Mon, 30 May 2022 16:02:02 +0000 (GMT)
DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 5F6123857B93
Received: by mail-pf1-x431.google.com with SMTP id j6so10885028pfe.13
 for <gcc-help@gcc.gnu.org>; Mon, 30 May 2022 09:02:02 -0700 (PDT)
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
 d=1e100.net; s=20210112;
 h=x-gm-message-state:mime-version:from:date:message-id:subject:to;
 bh=QnUpmnmm5F/waSVaDWK0Uz1RI5sEaFOhhbISHzsasFA=;
 b=wIGyibNS1vpaaBIXb8X2VvUsZRCh7hOVMJM54oc9+IyGeyj2639+nOwTEdQS58Fkl6
 z4x96384O5mZTrudblwek71JkeWa+Ss6SxAAkMTeYj+BAIBdUTWmyUIBFLupMnN8Uc33
 5bmYwMW7iPZPF9egsKA4O+hDhFiok3cTpu1KsBWDqS7CKLw0oyP0mTsPz4dZM39fCehc
 /NHdsq/msRPPq+BXgtflkgIhpAgS9PlUraN2//x3bZ10wjxotbMWpscwT1E1FvDYXXVR
 9O7NuzrrRWf3ZxV3z0ungkNO21W/BxiS2O3UYcic8wT6UaI9FVMG/S6ehEHGHqKQk64U
 uYvg==
X-Gm-Message-State: AOAM532pqYD06ugSrICjnI37uF+lFnXf+x7Fc2QZYVZZ5AJoFJiZAa3o
 LB5Jj3B08DOk9Tp/ODO7jXZcEn4w0VgVSwom7HPl1TudH2w=
X-Google-Smtp-Source: ABdhPJz9fYGbj7uSLwsG0DZ3hj90COnPk6GySw37oFFnLGTjA/44MQoVGleIWKJHrmb5Ob1K0940i7EPSqv/QwD4olA=
X-Received: by 2002:a65:554d:0:b0:3c6:3f22:72cd with SMTP id
 t13-20020a65554d000000b003c63f2272cdmr48890091pgr.283.1653926521275; Mon, 30
 May 2022 09:02:01 -0700 (PDT)
MIME-Version: 1.0
From: Piotr Krukowiecki <piotr.krukowiecki@gmail.com>
Date: Mon, 30 May 2022 18:01:48 +0200
Message-ID: <CAA01Csq+dGhDrf5UTbUXbMPbCV=M1MFUHQtb7dWF6M8wcenTAw@mail.gmail.com>
Subject: Format of Compiled Module Interface (gcm file - c++20 modules) ?
To: gcc-help@gcc.gnu.org
Content-Type: text/plain; charset="UTF-8"
X-Spam-Status: No, score=-0.4 required=5.0 tests=BAYES_00, DKIM_SIGNED,
 DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_FROM, KAM_SHORT,
 RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP,
 T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6
X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on
 server2.sourceware.org
X-BeenThere: gcc-help@gcc.gnu.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Gcc-help mailing list <gcc-help.gcc.gnu.org>
List-Unsubscribe: <https://gcc.gnu.org/mailman/options/gcc-help>,
 <mailto:gcc-help-request@gcc.gnu.org?subject=unsubscribe>
List-Archive: <https://gcc.gnu.org/pipermail/gcc-help/>
List-Post: <mailto:gcc-help@gcc.gnu.org>
List-Help: <mailto:gcc-help-request@gcc.gnu.org?subject=help>
List-Subscribe: <https://gcc.gnu.org/mailman/listinfo/gcc-help>,
 <mailto:gcc-help-request@gcc.gnu.org?subject=subscribe>
X-List-Received-Date: Mon, 30 May 2022 16:02:05 -0000

Hi,

is there a description of .gcm file content?

I've read https://gcc.gnu.org/onlinedocs/gcc/C_002b_002b-Compiled-Module-Interface.html
so I understand it's ELF32 file, but I'd like to understand what's
kept inside and how. For example, an inline function body may be
present inside CMI, I'd like to know how to find it and parse it.

It seems that gcc implementation is in
https://github.com/gcc-mirror/gcc/blob/master/gcc/cp/module.cc but is
the code the only documentation?

Thanks,
-- 
Piotr Krukowiecki