c4fb7180cb
Lots of code around LLDB was directly accessing the target's section load list. This NFC patch makes the section load list private so the Target class can access it, but everyone else now uses accessor functions. This allows us to control the resolving of addresses and will allow for functionality in LLDB which can lazily resolve addresses in JIT plug-ins with a future patch.
223 lines
7.5 KiB
C++
223 lines
7.5 KiB
C++
//===-- ObjectFileJIT.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 "llvm/ADT/StringRef.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/Core/Section.h"
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#include "lldb/Expression/ObjectFileJIT.h"
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#include "lldb/Target/Process.h"
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#include "lldb/Target/SectionLoadList.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/DataBufferHeap.h"
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#include "lldb/Utility/FileSpec.h"
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#include "lldb/Utility/FileSpecList.h"
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#include "lldb/Utility/Log.h"
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#include "lldb/Utility/Timer.h"
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#include "lldb/Utility/UUID.h"
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using namespace lldb;
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using namespace lldb_private;
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char ObjectFileJIT::ID;
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void ObjectFileJIT::Initialize() {
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PluginManager::RegisterPlugin(GetPluginNameStatic(),
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GetPluginDescriptionStatic(), CreateInstance,
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CreateMemoryInstance, GetModuleSpecifications);
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}
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void ObjectFileJIT::Terminate() {
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PluginManager::UnregisterPlugin(CreateInstance);
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}
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ObjectFile *ObjectFileJIT::CreateInstance(const lldb::ModuleSP &module_sp,
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DataBufferSP data_sp,
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lldb::offset_t data_offset,
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const FileSpec *file,
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lldb::offset_t file_offset,
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lldb::offset_t length) {
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// JIT'ed object file is backed by the ObjectFileJITDelegate, never read from
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// a file
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return nullptr;
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}
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ObjectFile *ObjectFileJIT::CreateMemoryInstance(const lldb::ModuleSP &module_sp,
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WritableDataBufferSP data_sp,
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const ProcessSP &process_sp,
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lldb::addr_t header_addr) {
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// JIT'ed object file is backed by the ObjectFileJITDelegate, never read from
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// memory
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return nullptr;
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}
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size_t ObjectFileJIT::GetModuleSpecifications(
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const lldb_private::FileSpec &file, lldb::DataBufferSP &data_sp,
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lldb::offset_t data_offset, lldb::offset_t file_offset,
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lldb::offset_t length, lldb_private::ModuleSpecList &specs) {
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// JIT'ed object file can't be read from a file on disk
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return 0;
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}
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ObjectFileJIT::ObjectFileJIT(const lldb::ModuleSP &module_sp,
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const ObjectFileJITDelegateSP &delegate_sp)
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: ObjectFile(module_sp, nullptr, 0, 0, DataBufferSP(), 0), m_delegate_wp() {
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if (delegate_sp) {
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m_delegate_wp = delegate_sp;
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m_data.SetByteOrder(delegate_sp->GetByteOrder());
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m_data.SetAddressByteSize(delegate_sp->GetAddressByteSize());
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}
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}
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ObjectFileJIT::~ObjectFileJIT() = default;
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bool ObjectFileJIT::ParseHeader() {
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// JIT code is never in a file, nor is it required to have any header
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return false;
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}
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ByteOrder ObjectFileJIT::GetByteOrder() const { return m_data.GetByteOrder(); }
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bool ObjectFileJIT::IsExecutable() const { return false; }
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uint32_t ObjectFileJIT::GetAddressByteSize() const {
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return m_data.GetAddressByteSize();
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}
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void ObjectFileJIT::ParseSymtab(Symtab &symtab) {
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ObjectFileJITDelegateSP delegate_sp(m_delegate_wp.lock());
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if (delegate_sp)
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delegate_sp->PopulateSymtab(this, symtab);
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}
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bool ObjectFileJIT::IsStripped() {
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return false; // JIT code that is in a module is never stripped
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}
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void ObjectFileJIT::CreateSections(SectionList &unified_section_list) {
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if (!m_sections_up) {
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m_sections_up = std::make_unique<SectionList>();
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ObjectFileJITDelegateSP delegate_sp(m_delegate_wp.lock());
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if (delegate_sp) {
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delegate_sp->PopulateSectionList(this, *m_sections_up);
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unified_section_list = *m_sections_up;
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}
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}
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}
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void ObjectFileJIT::Dump(Stream *s) {
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ModuleSP module_sp(GetModule());
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if (module_sp) {
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std::lock_guard<std::recursive_mutex> guard(module_sp->GetMutex());
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s->Printf("%p: ", static_cast<void *>(this));
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s->Indent();
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s->PutCString("ObjectFileJIT");
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if (ArchSpec arch = GetArchitecture())
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*s << ", arch = " << arch.GetArchitectureName();
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s->EOL();
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SectionList *sections = GetSectionList();
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if (sections)
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sections->Dump(s->AsRawOstream(), s->GetIndentLevel(), nullptr, true,
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UINT32_MAX);
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if (m_symtab_up)
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m_symtab_up->Dump(s, nullptr, eSortOrderNone);
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}
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}
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UUID ObjectFileJIT::GetUUID() {
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// TODO: maybe get from delegate, not needed for first pass
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return UUID();
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}
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uint32_t ObjectFileJIT::GetDependentModules(FileSpecList &files) {
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// JIT modules don't have dependencies, but they could
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// if external functions are called and we know where they are
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files.Clear();
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return 0;
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}
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lldb_private::Address ObjectFileJIT::GetEntryPointAddress() {
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return Address();
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}
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lldb_private::Address ObjectFileJIT::GetBaseAddress() { return Address(); }
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ObjectFile::Type ObjectFileJIT::CalculateType() { return eTypeJIT; }
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ObjectFile::Strata ObjectFileJIT::CalculateStrata() { return eStrataJIT; }
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ArchSpec ObjectFileJIT::GetArchitecture() {
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if (ObjectFileJITDelegateSP delegate_sp = m_delegate_wp.lock())
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return delegate_sp->GetArchitecture();
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return ArchSpec();
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}
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bool ObjectFileJIT::SetLoadAddress(Target &target, lldb::addr_t value,
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bool value_is_offset) {
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size_t num_loaded_sections = 0;
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SectionList *section_list = GetSectionList();
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if (section_list) {
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const size_t num_sections = section_list->GetSize();
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// "value" is an offset to apply to each top level segment
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for (size_t sect_idx = 0; sect_idx < num_sections; ++sect_idx) {
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// Iterate through the object file sections to find all of the sections
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// that size on disk (to avoid __PAGEZERO) and load them
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SectionSP section_sp(section_list->GetSectionAtIndex(sect_idx));
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if (section_sp && section_sp->GetFileSize() > 0 &&
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!section_sp->IsThreadSpecific()) {
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if (target.SetSectionLoadAddress(section_sp,
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section_sp->GetFileAddress() + value))
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++num_loaded_sections;
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}
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}
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}
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return num_loaded_sections > 0;
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}
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size_t ObjectFileJIT::ReadSectionData(lldb_private::Section *section,
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lldb::offset_t section_offset, void *dst,
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size_t dst_len) {
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lldb::offset_t file_size = section->GetFileSize();
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if (section_offset < file_size) {
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size_t src_len = file_size - section_offset;
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if (src_len > dst_len)
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src_len = dst_len;
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const uint8_t *src =
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((uint8_t *)(uintptr_t)section->GetFileOffset()) + section_offset;
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memcpy(dst, src, src_len);
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return src_len;
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}
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return 0;
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}
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size_t
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ObjectFileJIT::ReadSectionData(lldb_private::Section *section,
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lldb_private::DataExtractor §ion_data) {
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if (section->GetFileSize()) {
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const void *src = (void *)(uintptr_t)section->GetFileOffset();
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DataBufferSP data_sp =
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std::make_shared<DataBufferHeap>(src, section->GetFileSize());
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section_data.SetData(data_sp, 0, data_sp->GetByteSize());
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section_data.SetByteOrder(GetByteOrder());
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section_data.SetAddressByteSize(GetAddressByteSize());
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return section_data.GetByteSize();
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}
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section_data.Clear();
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return 0;
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}
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