12dee9d3cd
In Android API level 23 and above, dynamic loader is able to load .so file directly from APK, which is zip file. https://android.googlesource.com/platform/bionic/+/master/ android-changes-for-ndk-developers.md# opening-shared-libraries-directly-from-an-apk The .so file is page aligned and uncompressed, so ObjectFileELF::GetModuleSpecifications works with .so file offset and size directly from zip file without extracting it. (D152757) GDBRemoteCommunicationServerCommon::GetModuleInfo returns a module spec to LLDB with "zip_path!/so_path" file spec, which is passed through from Android dynamic loader, and the .so file offset and size. PlatformAndroid::DownloadModuleSlice uses 'shell dd' to download the .so file slice from the zip file with the .so file offset and size. Differential Revision: https://reviews.llvm.org/D152759
58 lines
2.3 KiB
C++
58 lines
2.3 KiB
C++
//===-- ZipFileResolver.cpp -----------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "lldb/Host/common/ZipFileResolver.h"
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#include "lldb/Host/FileSystem.h"
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#include "lldb/Utility/DataBuffer.h"
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#include "lldb/Utility/FileSpec.h"
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#include "lldb/Utility/ZipFile.h"
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using namespace lldb_private;
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using namespace llvm::support;
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bool ZipFileResolver::ResolveSharedLibraryPath(const FileSpec &file_spec,
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FileKind &file_kind,
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std::string &file_path,
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lldb::offset_t &so_file_offset,
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lldb::offset_t &so_file_size) {
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// When bionic loads .so file from APK or zip file, this file_spec will be
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// "zip_path!/so_path". Otherwise it is just a normal file path.
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static constexpr llvm::StringLiteral k_zip_separator("!/");
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std::string path(file_spec.GetPath());
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size_t pos = path.find(k_zip_separator);
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if (pos == std::string::npos) {
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// This file_spec does not contain the zip separator.
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// Treat this file_spec as a normal file.
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// so_file_offset and so_file_size should be 0.
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file_kind = FileKind::eFileKindNormal;
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file_path = path;
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so_file_offset = 0;
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so_file_size = 0;
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return true;
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}
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// This file_spec is a zip .so path. Extract the zip path and the .so path.
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std::string zip_path(path.substr(0, pos));
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std::string so_path(path.substr(pos + k_zip_separator.size()));
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// Try to find the .so file from the zip file.
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FileSpec zip_file_spec(zip_path);
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uint64_t zip_file_size = FileSystem::Instance().GetByteSize(zip_file_spec);
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lldb::DataBufferSP zip_data =
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FileSystem::Instance().CreateDataBuffer(zip_file_spec, zip_file_size);
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if (ZipFile::Find(zip_data, so_path, so_file_offset, so_file_size)) {
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// Found the .so file from the zip file and got the file offset and size.
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// Return the zip path. so_file_offset and so_file_size are already set.
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file_kind = FileKind::eFileKindZip;
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file_path = zip_path;
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return true;
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}
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return false;
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}
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