Add some preloaded classes related files and tools

Added copyright-header to be used by generation scripts to
automatically add a copyright header to preloaded classes.

Add a default blacklist file to avoid needing to manually
remove classes that can't be preloaded in the zygote.

Added a script go generate a preloaded classes list from a raw class
list. This script adds the copyright headers and comments and removes
blacklisted classes.

Bug: 37966211
Test: manually run the scripts

Change-Id: I166f990c41978c80134d2f1e12c1b1079a12752a

3 files changed, 49 insertions, 0 deletions

diff --git a/config/copyright-header b/config/copyright-header
new file mode 100644
index 000000000000..93071cd7e2ef
--- /dev/null
+++ b/config/copyright-header
@@ -0,0 +1,15 @@
+#
+# Copyright (C) 2017 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
diff --git a/config/generate-preloaded-classes.sh b/config/generate-preloaded-classes.sh
new file mode 100755
index 000000000000..d55190bf4256
--- /dev/null
+++ b/config/generate-preloaded-classes.sh
@@ -0,0 +1,33 @@
+#!/bin/bash
+#
+# Copyright (C) 2017 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+if [ "$#" -lt 2 ]; then
+  echo "Usage $0 <input classes file> <blacklist file> [extra classes files]"
+  exit 1
+fi
+echo "# Preloaded-classes filter file for phones.
+#
+# Classes in this file will be allocated into the boot image, and forcibly initialized in
+# the zygote during initialization. This is a trade-off, using virtual address space to share
+# common heap between apps.
+#
+# This file has been derived for mainline phone (and tablet) usage.
+#"
+input=$1
+blacklist=$2
+shift 2
+extra_classes_files=("$@")
+sort "$input" "${extra_classes_files[@]}" | uniq | grep -f "$blacklist" -v -F -x
+
diff --git a/config/preloaded-classes-blacklist b/config/preloaded-classes-blacklist
new file mode 100644
index 000000000000..48cdce852872
--- /dev/null
+++ b/config/preloaded-classes-blacklist
@@ -0,0 +1 @@
+placeholder