1#!/bin/bash -e
2
3# Copyright 2020 Google Inc. All rights reserved.
4#
5# Licensed under the Apache License, Version 2.0 (the "License");
6# you may not use this file except in compliance with the License.
7# You may obtain a copy of the License at
8#
9#     http://www.apache.org/licenses/LICENSE-2.0
10#
11# Unless required by applicable law or agreed to in writing, software
12# distributed under the License is distributed on an "AS IS" BASIS,
13# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14# See the License for the specific language governing permissions and
15# limitations under the License.
16
17# Generates NDK API txt file used by Mainline modules. NDK APIs would have value
18# "UND" in Ndx column and have suffix "@LIB_NAME" in Name column.
19# For example, current line llvm-readelf output is:
20# 1: 00000000     0     FUNC      GLOBAL  DEFAULT   UND   dlopen@LIBC
21# After the parse function below "dlopen" would be write to the output file.
22printHelp() {
23    echo "**************************** Usage Instructions ****************************"
24    echo "This script is used to generate the Mainline modules backed-by NDK symbols."
25    echo ""
26    echo "To run this script use: ./gen_ndk_backed_by_apex.sh \$OUTPUT_FILE_PATH \$NDK_LIB_NAME_LIST \$MODULE_LIB1 \$MODULE_LIB2..."
27    echo "For example: If output write to /backedby.txt then the command would be:"
28    echo "./gen_ndk_backed_by_apex.sh /backedby.txt /ndkLibList.txt lib1.so lib2.so"
29    echo "If the module1 is backing lib1 then the backedby.txt would contains: "
30    echo "lib1"
31}
32
33contains() {
34  val="$1"
35  shift
36  for x in "$@"; do
37    if [ "$x" = "$val" ]; then
38      return 0
39    fi
40  done
41  return 1
42}
43
44
45genBackedByList() {
46  out="$1"
47  shift
48  ndk_list="$1"
49  shift
50  rm -f "$out"
51  touch "$out"
52  while IFS= read -r line
53  do
54    soFileName=$(echo "$line" | sed 's/\(.*so\).*/\1/')
55    if [[ ! -z "$soFileName" && "$soFileName" != *"#"* ]]
56    then
57      if contains "$soFileName" "$@"; then
58        echo "$soFileName" >> "$out"
59      fi
60    fi
61  done < "$ndk_list"
62}
63
64if [[ "$1" == "help" ]]
65then
66  printHelp
67elif [[ "$#" -lt 2 ]]
68then
69  echo "Wrong argument length. Expecting at least 2 argument representing output path, path to ndk library list, followed by a list of libraries in the Mainline module."
70else
71  genBackedByList "$@"
72fi
73