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// 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/file_util.h"
#include "base/files/file_path.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;
}
// static
NativeLibrary LoadNativeLibrary(const base::FilePath& library_path,
std::string* 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)
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
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