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- // Copyright 2019 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/android/bundle_utils.h"
- #include <android/dlext.h>
- #include <dlfcn.h>
- #include "base/android/jni_android.h"
- #include "base/android/jni_string.h"
- #include "base/base_jni_headers/BundleUtils_jni.h"
- #include "base/check.h"
- #include "base/files/file_path.h"
- #include "base/notreached.h"
- // These symbols are added by the lld linker when creating a partitioned shared
- // library. The symbols live in the base library, and are used to properly load
- // the other partitions (feature libraries) when needed.
- struct PartitionIndexEntry {
- int32_t name_relptr;
- int32_t addr_relptr;
- uint32_t size;
- };
- static_assert(sizeof(PartitionIndexEntry) == 12U,
- "Unexpected PartitionIndexEntry size");
- // Marked as weak_import because these symbols are lld-specific. The method that
- // uses them will only be invoked in builds that have lld-generated partitions.
- extern PartitionIndexEntry __part_index_begin[] __attribute__((weak_import));
- extern PartitionIndexEntry __part_index_end[] __attribute__((weak_import));
- extern "C" {
- // Marked as weak_import because this symbol is either supplied by the system
- // (on Android N+), or by Crazy Linker (Android M and prior).
- extern void* android_dlopen_ext(const char* __filename,
- int __flags,
- const android_dlextinfo* __info)
- __attribute__((weak_import));
- } // extern "C"
- namespace base {
- namespace android {
- namespace {
- const void* ReadRelPtr(const int32_t* relptr) {
- return reinterpret_cast<const char*>(relptr) + *relptr;
- }
- } // namespace
- // static
- std::string BundleUtils::ResolveLibraryPath(const std::string& library_name,
- const std::string& split_name) {
- JNIEnv* env = AttachCurrentThread();
- ScopedJavaLocalRef<jstring> java_path = Java_BundleUtils_getNativeLibraryPath(
- env, ConvertUTF8ToJavaString(env, library_name),
- ConvertUTF8ToJavaString(env, split_name));
- // TODO(https://crbug.com/1019853): Remove this tolerance.
- if (!java_path) {
- return std::string();
- }
- return ConvertJavaStringToUTF8(env, java_path);
- }
- // static
- bool BundleUtils::IsBundle() {
- return Java_BundleUtils_isBundleForNative(AttachCurrentThread());
- }
- // static
- void* BundleUtils::DlOpenModuleLibraryPartition(const std::string& library_name,
- const std::string& partition,
- const std::string& split_name) {
- // TODO(https://crbug.com/1019853): Remove this tolerance.
- std::string library_path = ResolveLibraryPath(library_name, split_name);
- if (library_path.empty()) {
- return nullptr;
- }
- // Linear search is required here because the partition descriptors are not
- // ordered. If a large number of partitions come into existence, lld could be
- // modified to sort the partitions.
- DCHECK(__part_index_begin != nullptr);
- DCHECK(__part_index_end != nullptr);
- for (const PartitionIndexEntry* part = __part_index_begin;
- part != __part_index_end; ++part) {
- std::string name(
- reinterpret_cast<const char*>(ReadRelPtr(&part->name_relptr)));
- if (name == partition) {
- android_dlextinfo info = {};
- info.flags = ANDROID_DLEXT_RESERVED_ADDRESS;
- info.reserved_addr = const_cast<void*>(ReadRelPtr(&part->addr_relptr));
- info.reserved_size = part->size;
- DCHECK(android_dlopen_ext != nullptr);
- return android_dlopen_ext(library_path.c_str(), RTLD_LOCAL, &info);
- }
- }
- NOTREACHED();
- return nullptr;
- }
- } // namespace android
- } // namespace base
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