From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 3370 invoked by alias); 30 May 2012 06:02:20 -0000 Received: (qmail 3333 invoked by uid 22791); 30 May 2012 06:02:16 -0000 X-SWARE-Spam-Status: No, hits=-4.3 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00,KHOP_THREADED,TW_GM X-Spam-Check-By: sourceware.org Received: from localhost (HELO gcc.gnu.org) (127.0.0.1) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Wed, 30 May 2012 06:01:25 +0000 From: "jimis at gmx dot net" To: gcc-bugs@gcc.gnu.org Subject: [Bug preprocessor/53525] Performance regression due to enabling track-macro-expansion Date: Wed, 30 May 2012 06:06:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: preprocessor X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: jimis at gmx dot net X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated Content-Type: text/plain; charset="UTF-8" MIME-Version: 1.0 Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org X-SW-Source: 2012-05/txt/msg02809.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53525 --- Comment #7 from jimis 2012-05-30 06:01:23 UTC --- Now time for the most intrusive and problematic patches. I tried moving all virt_locs, expanded, expanded_virt_locs to obstacks for allocation. After many failures to work with obstacks as they are I had to introduce two new functions, obstack_{mark,release}(), that allow me to continue growing an older object by pushing and popping a special marker. Previous patches are included with the following, but I'm submitting it separately because it's WIP. Even though it is now stable, there is a bad memory leak that I don't know how to handle since I'm kind of lost in the macro-expansion code. I'd appreciate suggestions, just search for LEAK or TODO in my comments. :-p Please ignore whitespace changes (that are highlighted by emacs so I fix them) or stylistic changes in parts that I rewrote so many times that lost completely their initial style.