| OLD | NEW |
|---|
| (Empty) |
| 1 // Copyright (c) 2011 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 #include "base/native_library.h" | |
| 6 | |
| 7 #include <dlfcn.h> | |
| 8 #include <mach-o/getsect.h> | |
| 9 | |
| 10 #include "base/files/file_path.h" | |
| 11 #include "base/files/file_util.h" | |
| 12 #include "base/logging.h" | |
| 13 #include "base/mac/scoped_cftyperef.h" | |
| 14 #include "base/strings/string_util.h" | |
| 15 #include "base/strings/utf_string_conversions.h" | |
| 16 #include "base/threading/thread_restrictions.h" | |
| 17 | |
| 18 namespace base { | |
| 19 | |
| 20 static NativeLibraryObjCStatus GetObjCStatusForImage( | |
| 21 const void* function_pointer) { | |
| 22 Dl_info info; | |
| 23 if (!dladdr(function_pointer, &info)) | |
| 24 return OBJC_UNKNOWN; | |
| 25 | |
| 26 // See if the the image contains an "ObjC image info" segment. This method | |
| 27 // of testing is used in _CFBundleGrokObjcImageInfoFromFile in | |
| 28 // CF-744/CFBundle.c, around lines 2447-2474. | |
| 29 // | |
| 30 // In 32-bit images, ObjC can be recognized in __OBJC,__image_info, whereas | |
| 31 // in 64-bit, the data is in __DATA,__objc_imageinfo. | |
| 32 #if __LP64__ | |
| 33 const section_64* section = getsectbynamefromheader_64( | |
| 34 reinterpret_cast<const struct mach_header_64*>(info.dli_fbase), | |
| 35 SEG_DATA, "__objc_imageinfo"); | |
| 36 #else | |
| 37 const section* section = getsectbynamefromheader( | |
| 38 reinterpret_cast<const struct mach_header*>(info.dli_fbase), | |
| 39 SEG_OBJC, "__image_info"); | |
| 40 #endif | |
| 41 return section == NULL ? OBJC_NOT_PRESENT : OBJC_PRESENT; | |
| 42 } | |
| 43 | |
| 44 std::string NativeLibraryLoadError::ToString() const { | |
| 45 return message; | |
| 46 } | |
| 47 | |
| 48 // static | |
| 49 NativeLibrary LoadNativeLibrary(const base::FilePath& library_path, | |
| 50 NativeLibraryLoadError* error) { | |
| 51 // dlopen() etc. open the file off disk. | |
| 52 if (library_path.Extension() == "dylib" || !DirectoryExists(library_path)) { | |
| 53 void* dylib = dlopen(library_path.value().c_str(), RTLD_LAZY); | |
| 54 if (!dylib) { | |
| 55 error->message = dlerror(); | |
| 56 return NULL; | |
| 57 } | |
| 58 NativeLibrary native_lib = new NativeLibraryStruct(); | |
| 59 native_lib->type = DYNAMIC_LIB; | |
| 60 native_lib->dylib = dylib; | |
| 61 native_lib->objc_status = OBJC_UNKNOWN; | |
| 62 return native_lib; | |
| 63 } | |
| 64 base::ScopedCFTypeRef<CFURLRef> url(CFURLCreateFromFileSystemRepresentation( | |
| 65 kCFAllocatorDefault, | |
| 66 (const UInt8*)library_path.value().c_str(), | |
| 67 library_path.value().length(), | |
| 68 true)); | |
| 69 if (!url) | |
| 70 return NULL; | |
| 71 CFBundleRef bundle = CFBundleCreate(kCFAllocatorDefault, url.get()); | |
| 72 if (!bundle) | |
| 73 return NULL; | |
| 74 | |
| 75 NativeLibrary native_lib = new NativeLibraryStruct(); | |
| 76 native_lib->type = BUNDLE; | |
| 77 native_lib->bundle = bundle; | |
| 78 native_lib->bundle_resource_ref = CFBundleOpenBundleResourceMap(bundle); | |
| 79 native_lib->objc_status = OBJC_UNKNOWN; | |
| 80 return native_lib; | |
| 81 } | |
| 82 | |
| 83 // static | |
| 84 void UnloadNativeLibrary(NativeLibrary library) { | |
| 85 if (library->objc_status == OBJC_NOT_PRESENT) { | |
| 86 if (library->type == BUNDLE) { | |
| 87 CFBundleCloseBundleResourceMap(library->bundle, | |
| 88 library->bundle_resource_ref); | |
| 89 CFRelease(library->bundle); | |
| 90 } else { | |
| 91 dlclose(library->dylib); | |
| 92 } | |
| 93 } else { | |
| 94 VLOG(2) << "Not unloading NativeLibrary because it may contain an ObjC " | |
| 95 "segment. library->objc_status = " << library->objc_status; | |
| 96 // Deliberately do not CFRelease the bundle or dlclose the dylib because | |
| 97 // doing so can corrupt the ObjC runtime method caches. See | |
| 98 // http://crbug.com/172319 for details. | |
| 99 } | |
| 100 delete library; | |
| 101 } | |
| 102 | |
| 103 // static | |
| 104 void* GetFunctionPointerFromNativeLibrary(NativeLibrary library, | |
| 105 const char* name) { | |
| 106 void* function_pointer = NULL; | |
| 107 | |
| 108 // Get the function pointer using the right API for the type. | |
| 109 if (library->type == BUNDLE) { | |
| 110 base::ScopedCFTypeRef<CFStringRef> symbol_name(CFStringCreateWithCString( | |
| 111 kCFAllocatorDefault, name, kCFStringEncodingUTF8)); | |
| 112 function_pointer = CFBundleGetFunctionPointerForName(library->bundle, | |
| 113 symbol_name); | |
| 114 } else { | |
| 115 function_pointer = dlsym(library->dylib, name); | |
| 116 } | |
| 117 | |
| 118 // If this library hasn't been tested for having ObjC, use the function | |
| 119 // pointer to look up the section information for the library. | |
| 120 if (function_pointer && library->objc_status == OBJC_UNKNOWN) | |
| 121 library->objc_status = GetObjCStatusForImage(function_pointer); | |
| 122 | |
| 123 return function_pointer; | |
| 124 } | |
| 125 | |
| 126 // static | |
| 127 string16 GetNativeLibraryName(const string16& name) { | |
| 128 return name + ASCIIToUTF16(".dylib"); | |
| 129 } | |
| 130 | |
| 131 } // namespace base | |
| OLD | NEW |
|---|
Chromium Code Reviews
