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