1 /*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "SymbolDatabase.h"
18
19 #include "SymbolFileParser.h"
20
21 #include <err.h>
22 #include <stdio.h>
23 #include <stdlib.h>
24
25 #include <fstream>
26 #include <streambuf>
27 #include <string>
28 #include <unordered_set>
29
30 #include <llvm/ADT/SmallVector.h>
31 #include <llvm/ADT/StringRef.h>
32 #include <llvm/Object/Binary.h>
33 #include <llvm/Object/ELFObjectFile.h>
34
35 #include "versioner.h"
36
37 using namespace llvm;
38 using namespace llvm::object;
39
getSymbols(const std::string & filename)40 std::unordered_set<std::string> getSymbols(const std::string& filename) {
41 std::unordered_set<std::string> result;
42 auto binaryOrError = createBinary(filename);
43 if (!binaryOrError) {
44 errx(1, "failed to open library at %s: %s\n", filename.c_str(),
45 llvm::toString(binaryOrError.takeError()).c_str());
46 }
47
48 ELFObjectFileBase* elf = dyn_cast_or_null<ELFObjectFileBase>(binaryOrError.get().getBinary());
49 if (!elf) {
50 errx(1, "failed to parse %s as ELF", filename.c_str());
51 }
52
53 for (const ELFSymbolRef symbol : elf->getDynamicSymbolIterators()) {
54 Expected<StringRef> symbolNameOrError = symbol.getName();
55
56 if (!symbolNameOrError) {
57 errx(1, "failed to get symbol name for symbol in %s: %s", filename.c_str(),
58 llvm::toString(symbolNameOrError.takeError()).c_str());
59 }
60
61 result.insert(symbolNameOrError.get().str());
62 }
63
64 return result;
65 }
66
parsePlatform(const CompilationType & type,const std::string & platform_dir)67 static std::map<std::string, NdkSymbolType> parsePlatform(const CompilationType& type,
68 const std::string& platform_dir) {
69 static const std::pair<const char*, bool> wanted_files[] = {
70 {"crtbegin.map.txt", false},
71 {"libc.map.txt", true},
72 };
73
74 std::map<std::string, NdkSymbolType> result;
75
76 for (auto&& [filename, required] : wanted_files) {
77 std::string path = platform_dir + "/" + filename;
78
79 std::optional<SymbolMap> symbols = parseSymbolFile(path, type);
80 if (!symbols) {
81 if (required) {
82 errx(1, "error: failed to load: %s", path.c_str());
83 }
84 continue;
85 }
86
87 for (auto&& [symbol_name, symbol_type] : *symbols) {
88 if (symbol_name.empty()) {
89 continue;
90 }
91
92 if (result.count(symbol_name) != 0) {
93 if (strict) {
94 printf("duplicated symbol '%s' in '%s'\n", symbol_name.c_str(), path.c_str());
95 }
96 }
97
98 result[symbol_name] = symbol_type;
99 }
100 }
101
102 return result;
103 }
104
parsePlatforms(const std::set<CompilationType> & types,const std::string & platform_dir)105 std::optional<NdkSymbolDatabase> parsePlatforms(const std::set<CompilationType>& types,
106 const std::string& platform_dir) {
107 NdkSymbolDatabase result;
108 for (const CompilationType& type : types) {
109 std::map<std::string, NdkSymbolType> symbols = parsePlatform(type, platform_dir);
110 for (const auto& it : symbols) {
111 result[it.first][type] = it.second;
112 }
113 }
114 return std::make_optional(std::move(result));
115 }
116