From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thomas Rast Subject: [PATCH 1/8] Support coverage testing with GCC/gcov Date: Sun, 15 Feb 2009 23:25:38 +0100 Message-ID: References: Cc: Junio C Hamano To: git@vger.kernel.org X-From: git-owner@vger.kernel.org Sun Feb 15 23:28:01 2009 Return-path: Envelope-to: gcvg-git-2@gmane.org Received: from vger.kernel.org ([209.132.176.167]) by lo.gmane.org with esmtp (Exim 4.50) id 1LYpSt-0004VH-30 for gcvg-git-2@gmane.org; Sun, 15 Feb 2009 23:27:55 +0100 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753429AbZBOWZ7 (ORCPT ); Sun, 15 Feb 2009 17:25:59 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752918AbZBOWZ6 (ORCPT ); Sun, 15 Feb 2009 17:25:58 -0500 Received: from xsmtp1.ethz.ch ([82.130.70.13]:11608 "EHLO xsmtp1.ethz.ch" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753233AbZBOWZ4 (ORCPT ); Sun, 15 Feb 2009 17:25:56 -0500 Received: from xfe1.d.ethz.ch ([82.130.124.41]) by xsmtp1.ethz.ch with Microsoft SMTPSVC(6.0.3790.3959); Sun, 15 Feb 2009 23:25:54 +0100 Received: from localhost.localdomain ([77.56.223.244]) by xfe1.d.ethz.ch over TLS secured channel with Microsoft SMTPSVC(6.0.3790.3959); Sun, 15 Feb 2009 23:25:53 +0100 X-Mailer: git-send-email 1.6.2.rc0.335.g1a2b In-Reply-To: X-OriginalArrivalTime: 15 Feb 2009 22:25:53.0944 (UTC) FILETIME=[5D57F980:01C98FBC] Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org Archived-At: With gcc's --coverage option, we can perform automatic coverage data collection for the test suite. Add a new Makefile target 'coverage' that scraps all previous coverage results, recompiles git with the required compiler/linker flags (in addition to any flags you specify manually), then runs the test suite and compiles a report. The compilation must be done with all optimizations disabled, since inlined functions (and for line-by-line coverage, also optimized branches/loops) break coverage tracking. The tests are run serially (with -j1). The coverage code should theoretically allow concurrent access to its data files, but the author saw random test failures. Obviously this could be improved. The report currently consists of a list of functions that were never executed during the tests, which is written to 'coverage-untested-functions'. Once this list becomes reasonably short, we would also want to look at branches that were never taken. Currently only toplevel *.c files are considered. It would be nice to at least include xdiff, but --coverage did not save data to subdirectories on the system used to write this (gcc 4.3.2). Signed-off-by: Thomas Rast --- Makefile | 23 +++++++++++++++++++++++ 1 files changed, 23 insertions(+), 0 deletions(-) diff --git a/Makefile b/Makefile index b040a96..1c514a9 100644 --- a/Makefile +++ b/Makefile @@ -1640,3 +1640,26 @@ check-docs:: check-builtins:: ./check-builtins.sh +### Test suite coverage testing +# +.PHONY: coverage coverage-clean coverage-build coverage-report + +coverage: + $(MAKE) coverage-build + $(MAKE) coverage-report + +coverage-clean: + rm -f *.gcda *.gcno + +COVERAGE_CFLAGS = $(CFLAGS) -O0 -ftest-coverage -fprofile-arcs +COVERAGE_LDFLAGS = $(CFLAGS) -O0 -lgcov + +coverage-build: coverage-clean + $(MAKE) CFLAGS="$(COVERAGE_CFLAGS)" LDFLAGS="$(COVERAGE_LDFLAGS)" \ + -j1 all test + +coverage-report: + gcov -b *.c + grep '^function.*called 0 ' *.c.gcov \ + | sed -e 's/\([^:]*\)\.gcov: *function \([^ ]*\) called.*/\1: \2/' \ + | tee coverage-untested-functions -- 1.6.2.rc0.335.g1a2b