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[chromium-blink-merge.git] / base / base_paths_mac.mm
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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 // Defines base::PathProviderMac which replaces base::PathProviderPosix for Mac
6 // in base/path_service.cc.
8 #include <dlfcn.h>
9 #import <Foundation/Foundation.h>
10 #include <mach-o/dyld.h>
12 #include "base/base_paths.h"
13 #include "base/compiler_specific.h"
14 #include "base/file_util.h"
15 #include "base/files/file_path.h"
16 #include "base/logging.h"
17 #include "base/mac/foundation_util.h"
18 #include "base/path_service.h"
19 #include "base/strings/string_util.h"
20 #include "build/build_config.h"
22 namespace {
24 void GetNSExecutablePath(base::FilePath* path) {
25   DCHECK(path);
26   // Executable path can have relative references ("..") depending on
27   // how the app was launched.
28   uint32_t executable_length = 0;
29   _NSGetExecutablePath(NULL, &executable_length);
30   DCHECK_GT(executable_length, 1u);
31   std::string executable_path;
32   int rv = _NSGetExecutablePath(WriteInto(&executable_path, executable_length),
33                                 &executable_length);
34   DCHECK_EQ(rv, 0);
36   // _NSGetExecutablePath may return paths containing ./ or ../ which makes
37   // FilePath::DirName() work incorrectly, convert it to absolute path so that
38   // paths such as DIR_SOURCE_ROOT can work, since we expect absolute paths to
39   // be returned here.
40   *path = base::MakeAbsoluteFilePath(base::FilePath(executable_path));
43 // Returns true if the module for |address| is found. |path| will contain
44 // the path to the module. Note that |path| may not be absolute.
45 bool GetModulePathForAddress(base::FilePath* path,
46                              const void* address) WARN_UNUSED_RESULT;
48 bool GetModulePathForAddress(base::FilePath* path, const void* address) {
49   Dl_info info;
50   if (dladdr(address, &info) == 0)
51     return false;
52   *path = base::FilePath(info.dli_fname);
53   return true;
56 }  // namespace
58 namespace base {
60 bool PathProviderMac(int key, base::FilePath* result) {
61   switch (key) {
62     case base::FILE_EXE:
63       GetNSExecutablePath(result);
64       return true;
65     case base::FILE_MODULE:
66       return GetModulePathForAddress(result,
67           reinterpret_cast<const void*>(&base::PathProviderMac));
68     case base::DIR_APP_DATA: {
69       bool success = base::mac::GetUserDirectory(NSApplicationSupportDirectory,
70                                                  result);
71 #if defined(OS_IOS)
72       // On IOS, this directory does not exist unless it is created explicitly.
73       if (success && !base::PathExists(*result))
74         success = base::CreateDirectory(*result);
75 #endif  // defined(OS_IOS)
76       return success;
77     }
78     case base::DIR_SOURCE_ROOT:
79       // Go through PathService to catch overrides.
80       if (!PathService::Get(base::FILE_EXE, result))
81         return false;
83       // Start with the executable's directory.
84       *result = result->DirName();
86 #if !defined(OS_IOS)
87       if (base::mac::AmIBundled()) {
88         // The bundled app executables (Chromium, TestShell, etc) live five
89         // levels down, eg:
90         // src/xcodebuild/{Debug|Release}/Chromium.app/Contents/MacOS/Chromium
91         *result = result->DirName().DirName().DirName().DirName().DirName();
92       } else {
93         // Unit tests execute two levels deep from the source root, eg:
94         // src/xcodebuild/{Debug|Release}/base_unittests
95         *result = result->DirName().DirName();
96       }
97 #endif
98       return true;
99     case base::DIR_USER_DESKTOP:
100 #if defined(OS_IOS)
101       // iOS does not have desktop directories.
102       NOTIMPLEMENTED();
103       return false;
104 #else
105       return base::mac::GetUserDirectory(NSDesktopDirectory, result);
106 #endif
107     case base::DIR_CACHE:
108       return base::mac::GetUserDirectory(NSCachesDirectory, result);
109     default:
110       return false;
111   }
114 }  // namespace base