3f024d0835
I was reading through ObjectContainerBSDArchive and came across some dead method decls, a less-than-completely-clear `shared_ptr` typedef in `ObjectContainerBSDArchive::Archive` for a shared_ptr<Archive> which was a little unclear when reading a decl like `shared_ptr archive_sp;` for a local variable.
217 lines
7.9 KiB
C++
217 lines
7.9 KiB
C++
//===-- ObjectContainerUniversalMachO.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 "ObjectContainerUniversalMachO.h"
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#include "lldb/Core/Module.h"
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#include "lldb/Core/ModuleSpec.h"
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#include "lldb/Core/PluginManager.h"
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#include "lldb/Symbol/ObjectFile.h"
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#include "lldb/Target/Target.h"
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#include "lldb/Utility/ArchSpec.h"
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#include "lldb/Utility/DataBuffer.h"
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#include "lldb/Utility/Stream.h"
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using namespace lldb;
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using namespace lldb_private;
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using namespace llvm::MachO;
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LLDB_PLUGIN_DEFINE_ADV(ObjectContainerUniversalMachO,
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ObjectContainerMachOArchive)
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void ObjectContainerUniversalMachO::Initialize() {
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PluginManager::RegisterPlugin(GetPluginNameStatic(),
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GetPluginDescriptionStatic(), CreateInstance,
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GetModuleSpecifications);
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}
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void ObjectContainerUniversalMachO::Terminate() {
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PluginManager::UnregisterPlugin(CreateInstance);
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}
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ObjectContainer *ObjectContainerUniversalMachO::CreateInstance(
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const lldb::ModuleSP &module_sp, DataBufferSP &data_sp,
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lldb::offset_t data_offset, const FileSpec *file,
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lldb::offset_t file_offset, lldb::offset_t length) {
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// We get data when we aren't trying to look for cached container
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// information, so only try and look for an architecture slice if we get data
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if (data_sp) {
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DataExtractor data;
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data.SetData(data_sp, data_offset, length);
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if (ObjectContainerUniversalMachO::MagicBytesMatch(data)) {
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std::unique_ptr<ObjectContainerUniversalMachO> container_up(
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new ObjectContainerUniversalMachO(module_sp, data_sp, data_offset,
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file, file_offset, length));
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if (container_up->ParseHeader()) {
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return container_up.release();
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}
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}
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}
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return nullptr;
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}
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bool ObjectContainerUniversalMachO::MagicBytesMatch(const DataExtractor &data) {
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lldb::offset_t offset = 0;
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uint32_t magic = data.GetU32(&offset);
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return magic == FAT_MAGIC || magic == FAT_CIGAM || magic == FAT_MAGIC_64 ||
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magic == FAT_CIGAM_64;
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}
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ObjectContainerUniversalMachO::ObjectContainerUniversalMachO(
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const lldb::ModuleSP &module_sp, DataBufferSP &data_sp,
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lldb::offset_t data_offset, const FileSpec *file,
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lldb::offset_t file_offset, lldb::offset_t length)
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: ObjectContainer(module_sp, file, file_offset, length, data_sp,
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data_offset),
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m_header(), m_fat_archs() {
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memset(&m_header, 0, sizeof(m_header));
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}
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ObjectContainerUniversalMachO::~ObjectContainerUniversalMachO() = default;
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bool ObjectContainerUniversalMachO::ParseHeader() {
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bool success = ParseHeader(*m_extractor_sp, m_header, m_fat_archs);
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// We no longer need any data, we parsed all we needed to parse and cached it
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// in m_header and m_fat_archs. Need to have an empty DataExtractor for code
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// that assumes it is non-null.
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m_extractor_sp = std::make_shared<DataExtractor>();
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return success;
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}
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bool ObjectContainerUniversalMachO::ParseHeader(
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lldb_private::DataExtractor &extractor, llvm::MachO::fat_header &header,
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std::vector<FatArch> &fat_archs) {
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// Store the file offset for this universal file as we could have a universal
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// .o file in a BSD archive, or be contained in another kind of object.
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lldb::offset_t offset = 0;
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extractor.SetByteOrder(eByteOrderBig);
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header.magic = extractor.GetU32(&offset);
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fat_archs.clear();
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// Universal mach-o files always have their headers in big endian.
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if (header.magic == FAT_MAGIC || header.magic == FAT_MAGIC_64) {
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const bool is_fat64 = header.magic == FAT_MAGIC_64;
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extractor.SetAddressByteSize(is_fat64 ? 8 : 4);
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header.nfat_arch = extractor.GetU32(&offset);
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// Now we should have enough data for all of the fat headers, so lets index
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// them so we know how many architectures that this universal binary
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// contains.
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for (uint32_t arch_idx = 0; arch_idx < header.nfat_arch; ++arch_idx) {
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if (extractor.ValidOffsetForDataOfSize(offset, sizeof(fat_arch))) {
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if (is_fat64) {
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fat_arch_64 arch;
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arch.cputype = extractor.GetU32(&offset);
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arch.cpusubtype = extractor.GetU32(&offset);
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arch.offset = extractor.GetU64(&offset);
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arch.size = extractor.GetU64(&offset);
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arch.align = extractor.GetU32(&offset);
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arch.reserved = extractor.GetU32(&offset);
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fat_archs.emplace_back(arch);
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} else {
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fat_arch arch;
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arch.cputype = extractor.GetU32(&offset);
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arch.cpusubtype = extractor.GetU32(&offset);
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arch.offset = extractor.GetU32(&offset);
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arch.size = extractor.GetU32(&offset);
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arch.align = extractor.GetU32(&offset);
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fat_archs.emplace_back(arch);
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}
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}
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}
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return true;
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}
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memset(&header, 0, sizeof(header));
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return true;
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}
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size_t ObjectContainerUniversalMachO::GetNumArchitectures() const {
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return m_header.nfat_arch;
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}
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bool ObjectContainerUniversalMachO::GetArchitectureAtIndex(
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uint32_t idx, ArchSpec &arch) const {
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if (idx < m_header.nfat_arch) {
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arch.SetArchitecture(eArchTypeMachO, m_fat_archs[idx].GetCPUType(),
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m_fat_archs[idx].GetCPUSubType());
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return true;
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}
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return false;
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}
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ObjectFileSP
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ObjectContainerUniversalMachO::GetObjectFile(const FileSpec *file) {
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uint32_t arch_idx = 0;
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ArchSpec arch;
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// If the module hasn't specified an architecture yet, set it to the default
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// architecture:
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ModuleSP module_sp(GetModule());
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if (module_sp) {
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if (!module_sp->GetArchitecture().IsValid()) {
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arch = Target::GetDefaultArchitecture();
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if (!arch.IsValid())
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arch.SetTriple(LLDB_ARCH_DEFAULT);
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} else
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arch = module_sp->GetArchitecture();
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ArchSpec curr_arch;
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// First, try to find an exact match for the Arch of the Target.
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for (arch_idx = 0; arch_idx < m_header.nfat_arch; ++arch_idx) {
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if (GetArchitectureAtIndex(arch_idx, curr_arch) &&
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arch.IsExactMatch(curr_arch))
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break;
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}
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// Failing an exact match, try to find a compatible Arch of the Target.
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if (arch_idx >= m_header.nfat_arch) {
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for (arch_idx = 0; arch_idx < m_header.nfat_arch; ++arch_idx) {
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if (GetArchitectureAtIndex(arch_idx, curr_arch) &&
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arch.IsCompatibleMatch(curr_arch))
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break;
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}
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}
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if (arch_idx < m_header.nfat_arch) {
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DataExtractorSP extractor_sp;
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lldb::offset_t data_offset = 0;
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return ObjectFile::FindPlugin(
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module_sp, file, m_offset + m_fat_archs[arch_idx].GetOffset(),
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m_fat_archs[arch_idx].GetSize(), extractor_sp, data_offset);
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}
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}
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return ObjectFileSP();
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}
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size_t ObjectContainerUniversalMachO::GetModuleSpecifications(
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const lldb_private::FileSpec &file, lldb::DataExtractorSP &extractor_sp,
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lldb::offset_t data_offset, lldb::offset_t file_offset,
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lldb::offset_t file_size, lldb_private::ModuleSpecList &specs) {
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const size_t initial_count = specs.GetSize();
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if (!extractor_sp)
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return initial_count;
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DataExtractorSP data_extractor_sp =
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extractor_sp->GetSubsetExtractorSP(data_offset);
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if (ObjectContainerUniversalMachO::MagicBytesMatch(*data_extractor_sp)) {
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llvm::MachO::fat_header header;
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std::vector<FatArch> fat_archs;
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if (ParseHeader(*data_extractor_sp, header, fat_archs)) {
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for (const FatArch &fat_arch : fat_archs) {
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const lldb::offset_t slice_file_offset =
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fat_arch.GetOffset() + file_offset;
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if (fat_arch.GetOffset() < file_size && file_size > slice_file_offset) {
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ObjectFile::GetModuleSpecifications(
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file, slice_file_offset, file_size - slice_file_offset, specs);
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}
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}
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}
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}
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return specs.GetSize() - initial_count;
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}
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