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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.
      4 
      5 // Defines base::PathProviderMac which replaces base::PathProviderPosix for Mac
      6 // in base/path_service.cc.
      7 
      8 #include <dlfcn.h>
      9 #import <Foundation/Foundation.h>
     10 #include <mach-o/dyld.h>
     11 
     12 #include "base/base_paths.h"
     13 #include "base/compiler_specific.h"
     14 #include "base/files/file_path.h"
     15 #include "base/files/file_util.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"
     21 
     22 namespace {
     23 
     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);
     35 
     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));
     41 }
     42 
     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;
     47 
     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;
     54 }
     55 
     56 }  // namespace
     57 
     58 namespace base {
     59 
     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;
     82 
     83       // Start with the executable's directory.
     84       *result = result->DirName();
     85 
     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   }
    112 }
    113 
    114 }  // namespace base
    115