| // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "base/native_library.h" |
| |
| #include <dlfcn.h> |
| #include <mach-o/getsect.h> |
| |
| #include "base/files/file_path.h" |
| #include "base/files/file_util.h" |
| #include "base/logging.h" |
| #include "base/mac/scoped_cftyperef.h" |
| #include "base/strings/string_util.h" |
| #include "base/strings/utf_string_conversions.h" |
| #include "base/threading/thread_restrictions.h" |
| |
| namespace base { |
| |
| static NativeLibraryObjCStatus GetObjCStatusForImage( |
| const void* function_pointer) { |
| Dl_info info; |
| if (!dladdr(function_pointer, &info)) |
| return OBJC_UNKNOWN; |
| |
| // See if the the image contains an "ObjC image info" segment. This method |
| // of testing is used in _CFBundleGrokObjcImageInfoFromFile in |
| // CF-744/CFBundle.c, around lines 2447-2474. |
| // |
| // In 32-bit images, ObjC can be recognized in __OBJC,__image_info, whereas |
| // in 64-bit, the data is in __DATA,__objc_imageinfo. |
| #if __LP64__ |
| const section_64* section = getsectbynamefromheader_64( |
| reinterpret_cast<const struct mach_header_64*>(info.dli_fbase), |
| SEG_DATA, "__objc_imageinfo"); |
| #else |
| const section* section = getsectbynamefromheader( |
| reinterpret_cast<const struct mach_header*>(info.dli_fbase), |
| SEG_OBJC, "__image_info"); |
| #endif |
| return section == NULL ? OBJC_NOT_PRESENT : OBJC_PRESENT; |
| } |
| |
| std::string NativeLibraryLoadError::ToString() const { |
| return message; |
| } |
| |
| // static |
| NativeLibrary LoadNativeLibrary(const base::FilePath& library_path, |
| NativeLibraryLoadError* error) { |
| // dlopen() etc. open the file off disk. |
| if (library_path.Extension() == "dylib" || !DirectoryExists(library_path)) { |
| void* dylib = dlopen(library_path.value().c_str(), RTLD_LAZY); |
| if (!dylib) { |
| if (error) |
| error->message = dlerror(); |
| return NULL; |
| } |
| NativeLibrary native_lib = new NativeLibraryStruct(); |
| native_lib->type = DYNAMIC_LIB; |
| native_lib->dylib = dylib; |
| native_lib->objc_status = OBJC_UNKNOWN; |
| return native_lib; |
| } |
| base::ScopedCFTypeRef<CFURLRef> url(CFURLCreateFromFileSystemRepresentation( |
| kCFAllocatorDefault, |
| (const UInt8*)library_path.value().c_str(), |
| library_path.value().length(), |
| true)); |
| if (!url) |
| return NULL; |
| CFBundleRef bundle = CFBundleCreate(kCFAllocatorDefault, url.get()); |
| if (!bundle) |
| return NULL; |
| |
| NativeLibrary native_lib = new NativeLibraryStruct(); |
| native_lib->type = BUNDLE; |
| native_lib->bundle = bundle; |
| native_lib->bundle_resource_ref = CFBundleOpenBundleResourceMap(bundle); |
| native_lib->objc_status = OBJC_UNKNOWN; |
| return native_lib; |
| } |
| |
| // static |
| void UnloadNativeLibrary(NativeLibrary library) { |
| if (library->objc_status == OBJC_NOT_PRESENT) { |
| if (library->type == BUNDLE) { |
| CFBundleCloseBundleResourceMap(library->bundle, |
| library->bundle_resource_ref); |
| CFRelease(library->bundle); |
| } else { |
| dlclose(library->dylib); |
| } |
| } else { |
| VLOG(2) << "Not unloading NativeLibrary because it may contain an ObjC " |
| "segment. library->objc_status = " << library->objc_status; |
| // Deliberately do not CFRelease the bundle or dlclose the dylib because |
| // doing so can corrupt the ObjC runtime method caches. See |
| // http://crbug.com/172319 for details. |
| } |
| delete library; |
| } |
| |
| // static |
| void* GetFunctionPointerFromNativeLibrary(NativeLibrary library, |
| const char* name) { |
| void* function_pointer = NULL; |
| |
| // Get the function pointer using the right API for the type. |
| if (library->type == BUNDLE) { |
| base::ScopedCFTypeRef<CFStringRef> symbol_name(CFStringCreateWithCString( |
| kCFAllocatorDefault, name, kCFStringEncodingUTF8)); |
| function_pointer = CFBundleGetFunctionPointerForName(library->bundle, |
| symbol_name); |
| } else { |
| function_pointer = dlsym(library->dylib, name); |
| } |
| |
| // If this library hasn't been tested for having ObjC, use the function |
| // pointer to look up the section information for the library. |
| if (function_pointer && library->objc_status == OBJC_UNKNOWN) |
| library->objc_status = GetObjCStatusForImage(function_pointer); |
| |
| return function_pointer; |
| } |
| |
| // static |
| string16 GetNativeLibraryName(const string16& name) { |
| return name + ASCIIToUTF16(".dylib"); |
| } |
| |
| } // namespace base |