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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 "native_library.h"
#include <dlfcn.h>
#include <mach-o/getsect.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 std::string& library_path,
NativeLibraryLoadError* error) {
// dlopen() etc. open the file off disk.
std::string::size_type delim(library_path.find_last_of('.', library_path.length()));
if ((delim != std::string::npos && library_path.substr(delim+1) == "dylib")) {
void* dylib = dlopen(library_path.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;
}
CFURLRef url = CFURLCreateFromFileSystemRepresentation(
kCFAllocatorDefault,
(const UInt8*)library_path.c_str(),
library_path.length(),
true);
if (!url)
return NULL;
CFBundleRef bundle = CFBundleCreate(kCFAllocatorDefault, url);
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)
return;
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);
}
}
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) {
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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