tools/coverage: clean up

bin/coverage

Index: bin/coverage
diff --git a/bin/coverage b/bin/coverage
new file mode 100755
index 0000000000000000000000000000000000000000..3339c17ce9046127b517b58570de7404ca8c51cc
--- /dev/null
+++ b/bin/coverage
@@ -0,0 +1,47 @@
+#!/bin/sh
+# Copyright 2013 Google Inc.

[mtklein_C, 2016/09/16 19:21:43]

:/

[hal.canary, 2016/09/20 18:19:01]

It's based on a copy of a file from 2013.

Done.

+#
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# Run something like this:
+#   $ bin/coverage dm --src tests
+# or
+#   $ bin/coverage dm --src gm skp
+
+set -x
+set -e
+
+cd "$(dirname "$0")/.."
+
+EXECUTABLE="$1"

[mtklein_C, 2016/09/16 19:21:43]

What's the deal with all the quoting?  Is $1 or $@ not safe to use?

[hal.canary, 2016/09/20 18:19:01]

It's always good habit in shell scripting.

[mtklein, 2016/09/20 22:38:53]

I'm not sure that that's true.  If the simple option works and you choose the
complex option, someone will one day assume the complexity you're adding here
matters.  It's disquieting to delete code and see no effect.  Please delete the
unnecessary code now so that we don't feel that disquiet later.

+shift
+GCOV=$(realpath tools/gcov_shim)
+
+QUIET=-q
+
+DIR="$(mktemp -d "${TMPDIR:-/tmp}/skia_coverage_XXXXXXXXXX")"

[mtklein_C, 2016/09/16 19:21:43]

Why not out/Coverage or somewhere else that lets you cache between runs?

[hal.canary, 2016/09/20 18:19:01]

I had issues with caching while testing.   It's fixed now.

Done.

+
+# Build $EXECUTABLE
+bin/sync

[mtklein_C, 2016/09/16 19:21:43]

Are you sure you want this here?  Syncing deps can be surprising.

[hal.canary, 2016/09/20 18:19:01]

Suprising how?

Not syncing deps before building can cause a lot of problems.

[mtklein, 2016/09/20 22:38:53]

It seems like an odd, but perhaps harmless, thing for a script handling code
coverage to have to know about syncing deps.

+bin/fetch-gn
+gn gen \
+   --args='cc="gcc -fprofile-arcs " cxx="g++ -fprofile-arcs" extra_cflags="-ftest-coverage"' \

[mtklein_C, 2016/09/16 19:21:43]

We used to use --coverage.  What's different here?

[hal.canary, 2016/09/20 18:19:01]

not sure why I changed.  `--coverage` works.

Done.

+   "$DIR"/build
+ninja -C "$DIR"/build "$EXECUTABLE"
+
+# Generate a zero-baseline so files not covered by $EXECUTABLE $@ will
+# still show up in the report.  This reads the .gcno files that are
+# created at compile time.
+lcov $QUIET --gcov-tool=$GCOV -c -b "$DIR"/build -d "$DIR"/build -o "$DIR"/baseline -i
+
+# Running the binary generates the real coverage information, the .gcda files.
+"$DIR"/build/"$EXECUTABLE" "$@"
+
+lcov $QUIET --gcov-tool=$GCOV -c -b "$DIR"/build -d "$DIR"/build -o "$DIR"/coverage
+
+lcov $QUIET -a "$DIR"/baseline -a "$DIR"/coverage -o "$DIR"/merged
+
+genhtml $QUIET "$DIR"/merged --legend -o "$DIR"/coverage_report --ignore-errors source
+
+xdg-open "$DIR"/coverage_report/index.html