From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 110599 invoked by alias); 18 Sep 2019 08:41:13 -0000 Mailing-List: contact gcc-patches-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-patches-owner@gcc.gnu.org Received: (qmail 110551 invoked by uid 89); 18 Sep 2019 08:41:12 -0000 Authentication-Results: sourceware.org; auth=none X-Spam-SWARE-Status: No, score=-10.8 required=5.0 tests=AWL,BAYES_00,GIT_PATCH_2,GIT_PATCH_3,SPF_NEUTRAL autolearn=ham version=3.3.1 spammy=secondary, sk:build_c X-HELO: eggs.gnu.org Received: from eggs.gnu.org (HELO eggs.gnu.org) (209.51.188.92) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP; Wed, 18 Sep 2019 08:41:11 +0000 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iAVVE-0008Jj-LM for gcc-patches@gcc.gnu.org; Wed, 18 Sep 2019 04:39:57 -0400 Received: from rock.gnat.com ([2620:20:4000:0:a9e:1ff:fe9b:1d1]:53808) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1iAVVC-0008Hb-9g for gcc-patches@gcc.gnu.org; Wed, 18 Sep 2019 04:39:56 -0400 Received: from localhost (localhost.localdomain [127.0.0.1]) by filtered-rock.gnat.com (Postfix) with ESMTP id B70B3117BD9; Wed, 18 Sep 2019 04:39:45 -0400 (EDT) Received: from rock.gnat.com ([127.0.0.1]) by localhost (rock.gnat.com [127.0.0.1]) (amavisd-new, port 10024) with LMTP id kyOQJ1UWZ+r4; Wed, 18 Sep 2019 04:39:45 -0400 (EDT) Received: from tron.gnat.com (tron.gnat.com [205.232.38.10]) by rock.gnat.com (Postfix) with ESMTP id 7489F117D25; Wed, 18 Sep 2019 04:39:45 -0400 (EDT) Received: by tron.gnat.com (Postfix, from userid 4862) id 704B1702; Wed, 18 Sep 2019 04:39:45 -0400 (EDT) Date: Wed, 18 Sep 2019 08:42:00 -0000 From: Pierre-Marie de Rodat To: gcc-patches@gcc.gnu.org Cc: Ed Schonberg Subject: [Ada] Use static discriminant value for discriminated task record Message-ID: <20190918083945.GA145262@adacore.com> MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="sdtB3X0nJg68CQEu" Content-Disposition: inline User-Agent: Mutt/1.5.23 (2014-03-12) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [fuzzy] X-Received-From: 2620:20:4000:0:a9e:1ff:fe9b:1d1 X-IsSubscribed: yes X-SW-Source: 2019-09/txt/msg01082.txt.bz2 --sdtB3X0nJg68CQEu Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-length: 699 This patch allows the construction of a static subtype for the generated constrained Secondary_Stack component of a task for which a stack size is specified, when compiling for a restricted run-time that forbids dynamic allocation. Needed for LLVM. Tested on x86_64-pc-linux-gnu, committed on trunk 2019-09-18 Ed Schonberg gcc/ada/ * sem_ch3.adb (Constrain_Component_Type): For a discriminated type, handle the case of a constraint given by a conversion of a discriminant of the enclosing type. Necessary when compiling a discriminated task for a restricted run-time, when the generated Secondary_Stack component may be set by means of an aspect on the task type. --sdtB3X0nJg68CQEu Content-Type: text/x-diff; charset=us-ascii Content-Disposition: attachment; filename="patch.diff" Content-length: 1763 --- gcc/ada/sem_ch3.adb +++ gcc/ada/sem_ch3.adb @@ -13258,7 +13258,9 @@ package body Sem_Ch3 is function Build_Constrained_Discriminated_Type (Old_Type : Entity_Id) return Entity_Id; - -- Ditto for record components + -- Ditto for record components. Handle the case where the constraint + -- is a conversion of the discriminant value, introduced during + -- expansion. function Build_Constrained_Access_Type (Old_Type : Entity_Id) return Entity_Id; @@ -13443,6 +13445,17 @@ package body Sem_Ch3 is if Is_Discriminant (Expr) then Need_To_Create_Itype := True; + + -- After expansion of discriminated task types, the value + -- of the discriminant may be converted to a run-time type + -- for restricted run-times. Propagate the value of the + -- discriminant ss well, so that e.g. the secondary stack + -- component has a static constraint. Necessry for LLVM. + + elsif Nkind (Expr) = N_Type_Conversion + and then Is_Discriminant (Expression (Expr)) + then + Need_To_Create_Itype := True; end if; Next_Elmt (Old_Constraint); @@ -13457,6 +13470,12 @@ package body Sem_Ch3 is if Is_Discriminant (Expr) then Expr := Get_Discr_Value (Expr); + + elsif Nkind (Expr) = N_Type_Conversion + and then Is_Discriminant (Expression (Expr)) + then + Expr := New_Copy_Tree (Expr); + Set_Expression (Expr, Get_Discr_Value (Expression (Expr))); end if; Append (New_Copy_Tree (Expr), To => Constr_List); --sdtB3X0nJg68CQEu--