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1 /*
2  * Copyright (C) 2019 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 <android-base/logging.h>
18 
19 #include <dlfcn.h>
20 
21 #include "globals.h"
22 
23 namespace art {
24 
25 #ifndef ART_STATIC_LIBARTBASE
26 
27 #ifdef __APPLE__
28 // dlopen(3) on Linux with just an SO name will search the already
29 // opened libraries. On Darwin, we need dlopen(3) needs the SO name
30 // qualified with it's path (if the SO is not on the search path). Use
31 // linker path when compiling app. See man pages for dlopen(3) and
32 // dlyd(1).
33   static constexpr const char kLibArtBaseDebug[] = "@rpath/libartbased.dylib";
34   static constexpr const char kLibArtBaseRelease[] = "@rpath/libartbase.dylib";
35 #else
36   static constexpr const char kLibArtBaseDebug[] = "libartbased.so";
37   static constexpr const char kLibArtBaseRelease[] = "libartbase.so";
38 #endif  // __APPLE__
39 
40 // Check that we have not loaded both debug and release version of libartbase at the same time.
41 //
42 // This can be a cascade problem originating from a call to
43 // LoadLibdexfileExternal in libdexfile_support: If it was called before any ART
44 // libraries were loaded it will default to the non-debug version, which can
45 // then clash with a later load of the debug version.
46 static struct CheckLoadedBuild {
CheckLoadedBuildart::CheckLoadedBuild47   CheckLoadedBuild() {
48     bool debug_build_loaded = (dlopen(kLibArtBaseDebug, RTLD_NOW | RTLD_NOLOAD) != nullptr);
49     bool release_build_loaded = (dlopen(kLibArtBaseRelease, RTLD_NOW | RTLD_NOLOAD) != nullptr);
50     // TODO: The exit calls below are needed as CHECK would cause recursive backtracing. Fix it.
51     if (!(debug_build_loaded || release_build_loaded)) {
52       LOG(FATAL_WITHOUT_ABORT) << "Failed to dlopen "
53                                << kLibArtBaseDebug
54                                << " or "
55                                << kLibArtBaseRelease;
56       exit(1);
57     }
58     if (kIsDebugBuild && release_build_loaded) {
59       LOG(FATAL_WITHOUT_ABORT) << "Loading "
60                                << kLibArtBaseDebug
61                                << " while "
62                                << kLibArtBaseRelease
63                                << " is already loaded";
64       exit(1);
65     }
66     if (!kIsDebugBuild && debug_build_loaded) {
67       LOG(FATAL_WITHOUT_ABORT) << "Loading "
68                                << kLibArtBaseRelease
69                                << " while "
70                                << kLibArtBaseDebug
71                                << " is already loaded";
72       exit(1);
73     }
74   }
75 } g_check_loaded_build;
76 
77 #endif  // !ART_STATIC_LIBARTBASE
78 
79 }  // namespace art
80