1 /*
2 * Copyright (C) 2018 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 "art_api/dex_file_support.h"
18
19 #include <dlfcn.h>
20 #include <mutex>
21
22 #ifndef STATIC_LIB
23 // Not used in the static lib, so avoid a dependency on this header in
24 // libdexfile_support_static.
25 #include <log/log.h>
26 #endif
27
28 namespace art_api {
29 namespace dex {
30
31 #ifdef STATIC_LIB
32 #define DEFINE_DLFUNC_PTR(CLASS, DLFUNC) decltype(DLFUNC)* CLASS::g_##DLFUNC = DLFUNC
33 #else
34 #define DEFINE_DLFUNC_PTR(CLASS, DLFUNC) decltype(DLFUNC)* CLASS::g_##DLFUNC = nullptr
35 #endif
36
37 DEFINE_DLFUNC_PTR(DexString, ExtDexFileMakeString);
38 DEFINE_DLFUNC_PTR(DexString, ExtDexFileGetString);
39 DEFINE_DLFUNC_PTR(DexString, ExtDexFileFreeString);
40 DEFINE_DLFUNC_PTR(DexFile, ExtDexFileOpenFromMemory);
41 DEFINE_DLFUNC_PTR(DexFile, ExtDexFileOpenFromFd);
42 DEFINE_DLFUNC_PTR(DexFile, ExtDexFileGetMethodInfoForOffset);
43 DEFINE_DLFUNC_PTR(DexFile, ExtDexFileGetAllMethodInfos);
44 DEFINE_DLFUNC_PTR(DexFile, ExtDexFileFree);
45
46 #undef DEFINE_DLFUNC_PTR
47
LoadLibdexfileExternal()48 void LoadLibdexfileExternal() {
49 #if defined(STATIC_LIB)
50 // Nothing to do here since all function pointers are initialised statically.
51 #elif defined(NO_DEXFILE_SUPPORT)
52 LOG_FATAL("Dex file support not available.");
53 #else
54 static std::once_flag dlopen_once;
55 std::call_once(dlopen_once, []() {
56 constexpr char kLibdexfileExternalLib[] = "libdexfile_external.so";
57 void* handle =
58 dlopen(kLibdexfileExternalLib, RTLD_NOW | RTLD_GLOBAL | RTLD_NODELETE);
59 LOG_ALWAYS_FATAL_IF(handle == nullptr, "Failed to load %s: %s",
60 kLibdexfileExternalLib, dlerror());
61
62 #define SET_DLFUNC_PTR(CLASS, DLFUNC) \
63 do { \
64 CLASS::g_##DLFUNC = reinterpret_cast<decltype(DLFUNC)*>(dlsym(handle, #DLFUNC)); \
65 LOG_ALWAYS_FATAL_IF(CLASS::g_##DLFUNC == nullptr, \
66 "Failed to find %s in %s: %s", \
67 #DLFUNC, \
68 kLibdexfileExternalLib, \
69 dlerror()); \
70 } while (0)
71
72 SET_DLFUNC_PTR(DexString, ExtDexFileMakeString);
73 SET_DLFUNC_PTR(DexString, ExtDexFileGetString);
74 SET_DLFUNC_PTR(DexString, ExtDexFileFreeString);
75 SET_DLFUNC_PTR(DexFile, ExtDexFileOpenFromMemory);
76 SET_DLFUNC_PTR(DexFile, ExtDexFileOpenFromFd);
77 SET_DLFUNC_PTR(DexFile, ExtDexFileGetMethodInfoForOffset);
78 SET_DLFUNC_PTR(DexFile, ExtDexFileGetAllMethodInfos);
79 SET_DLFUNC_PTR(DexFile, ExtDexFileFree);
80
81 #undef SET_DLFUNC_PTR
82 });
83 #endif // !defined(NO_DEXFILE_SUPPORT) && !defined(STATIC_LIB)
84 }
85
~DexFile()86 DexFile::~DexFile() { g_ExtDexFileFree(ext_dex_file_); }
87
AbsorbMethodInfo(const ExtDexFileMethodInfo & ext_method_info)88 MethodInfo DexFile::AbsorbMethodInfo(const ExtDexFileMethodInfo& ext_method_info) {
89 return {ext_method_info.offset, ext_method_info.len, DexString(ext_method_info.name)};
90 }
91
AddMethodInfoCallback(const ExtDexFileMethodInfo * ext_method_info,void * ctx)92 void DexFile::AddMethodInfoCallback(const ExtDexFileMethodInfo* ext_method_info, void* ctx) {
93 auto vect = static_cast<MethodInfoVector*>(ctx);
94 vect->emplace_back(AbsorbMethodInfo(*ext_method_info));
95 }
96
97 } // namespace dex
98 } // namespace art_api
99