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| //===-- ObjectFileJIT.cpp ---------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/StringRef.h"
#include "ObjectFileJIT.h"
#include "lldb/Core/Debugger.h"
#include "lldb/Core/FileSpecList.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/ModuleSpec.h"
#include "lldb/Core/PluginManager.h"
#include "lldb/Core/Section.h"
#include "lldb/Core/StreamFile.h"
#include "lldb/Host/Host.h"
#include "lldb/Symbol/ObjectFile.h"
#include "lldb/Target/Platform.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/SectionLoadList.h"
#include "lldb/Target/Target.h"
#include "lldb/Utility/ArchSpec.h"
#include "lldb/Utility/DataBuffer.h"
#include "lldb/Utility/DataBufferHeap.h"
#include "lldb/Utility/FileSpec.h"
#include "lldb/Utility/Log.h"
#include "lldb/Utility/RangeMap.h"
#include "lldb/Utility/StreamString.h"
#include "lldb/Utility/Timer.h"
#include "lldb/Utility/UUID.h"
#ifndef __APPLE__
#include "Utility/UuidCompatibility.h"
#endif
using namespace lldb;
using namespace lldb_private;
char ObjectFileJIT::ID;
void ObjectFileJIT::Initialize() {
PluginManager::RegisterPlugin(GetPluginNameStatic(),
GetPluginDescriptionStatic(), CreateInstance,
CreateMemoryInstance, GetModuleSpecifications);
}
void ObjectFileJIT::Terminate() {
PluginManager::UnregisterPlugin(CreateInstance);
}
lldb_private::ConstString ObjectFileJIT::GetPluginNameStatic() {
static ConstString g_name("jit");
return g_name;
}
const char *ObjectFileJIT::GetPluginDescriptionStatic() {
return "JIT code object file";
}
ObjectFile *ObjectFileJIT::CreateInstance(const lldb::ModuleSP &module_sp,
DataBufferSP &data_sp,
lldb::offset_t data_offset,
const FileSpec *file,
lldb::offset_t file_offset,
lldb::offset_t length) {
// JIT'ed object file is backed by the ObjectFileJITDelegate, never read from
// a file
return nullptr;
}
ObjectFile *ObjectFileJIT::CreateMemoryInstance(const lldb::ModuleSP &module_sp,
DataBufferSP &data_sp,
const ProcessSP &process_sp,
lldb::addr_t header_addr) {
// JIT'ed object file is backed by the ObjectFileJITDelegate, never read from
// memory
return nullptr;
}
size_t ObjectFileJIT::GetModuleSpecifications(
const lldb_private::FileSpec &file, lldb::DataBufferSP &data_sp,
lldb::offset_t data_offset, lldb::offset_t file_offset,
lldb::offset_t length, lldb_private::ModuleSpecList &specs) {
// JIT'ed object file can't be read from a file on disk
return 0;
}
ObjectFileJIT::ObjectFileJIT(const lldb::ModuleSP &module_sp,
const ObjectFileJITDelegateSP &delegate_sp)
: ObjectFile(module_sp, nullptr, 0, 0, DataBufferSP(), 0), m_delegate_wp() {
if (delegate_sp) {
m_delegate_wp = delegate_sp;
m_data.SetByteOrder(delegate_sp->GetByteOrder());
m_data.SetAddressByteSize(delegate_sp->GetAddressByteSize());
}
}
ObjectFileJIT::~ObjectFileJIT() {}
bool ObjectFileJIT::ParseHeader() {
// JIT code is never in a file, nor is it required to have any header
return false;
}
ByteOrder ObjectFileJIT::GetByteOrder() const { return m_data.GetByteOrder(); }
bool ObjectFileJIT::IsExecutable() const { return false; }
uint32_t ObjectFileJIT::GetAddressByteSize() const {
return m_data.GetAddressByteSize();
}
Symtab *ObjectFileJIT::GetSymtab() {
ModuleSP module_sp(GetModule());
if (module_sp) {
std::lock_guard<std::recursive_mutex> guard(module_sp->GetMutex());
if (m_symtab_up == nullptr) {
m_symtab_up.reset(new Symtab(this));
std::lock_guard<std::recursive_mutex> symtab_guard(
m_symtab_up->GetMutex());
ObjectFileJITDelegateSP delegate_sp(m_delegate_wp.lock());
if (delegate_sp)
delegate_sp->PopulateSymtab(this, *m_symtab_up);
// TODO: get symbols from delegate
m_symtab_up->Finalize();
}
}
return m_symtab_up.get();
}
bool ObjectFileJIT::IsStripped() {
return false; // JIT code that is in a module is never stripped
}
void ObjectFileJIT::CreateSections(SectionList &unified_section_list) {
if (!m_sections_up) {
m_sections_up.reset(new SectionList());
ObjectFileJITDelegateSP delegate_sp(m_delegate_wp.lock());
if (delegate_sp) {
delegate_sp->PopulateSectionList(this, *m_sections_up);
unified_section_list = *m_sections_up;
}
}
}
void ObjectFileJIT::Dump(Stream *s) {
ModuleSP module_sp(GetModule());
if (module_sp) {
std::lock_guard<std::recursive_mutex> guard(module_sp->GetMutex());
s->Printf("%p: ", static_cast<void *>(this));
s->Indent();
s->PutCString("ObjectFileJIT");
if (ArchSpec arch = GetArchitecture())
*s << ", arch = " << arch.GetArchitectureName();
s->EOL();
SectionList *sections = GetSectionList();
if (sections)
sections->Dump(s, nullptr, true, UINT32_MAX);
if (m_symtab_up)
m_symtab_up->Dump(s, nullptr, eSortOrderNone);
}
}
UUID ObjectFileJIT::GetUUID() {
// TODO: maybe get from delegate, not needed for first pass
return UUID();
}
uint32_t ObjectFileJIT::GetDependentModules(FileSpecList &files) {
// JIT modules don't have dependencies, but they could
// if external functions are called and we know where they are
files.Clear();
return 0;
}
lldb_private::Address ObjectFileJIT::GetEntryPointAddress() {
return Address();
}
lldb_private::Address ObjectFileJIT::GetBaseAddress() { return Address(); }
ObjectFile::Type ObjectFileJIT::CalculateType() { return eTypeJIT; }
ObjectFile::Strata ObjectFileJIT::CalculateStrata() { return eStrataJIT; }
ArchSpec ObjectFileJIT::GetArchitecture() {
if (ObjectFileJITDelegateSP delegate_sp = m_delegate_wp.lock())
return delegate_sp->GetArchitecture();
return ArchSpec();
}
// PluginInterface protocol
lldb_private::ConstString ObjectFileJIT::GetPluginName() {
return GetPluginNameStatic();
}
uint32_t ObjectFileJIT::GetPluginVersion() { return 1; }
bool ObjectFileJIT::SetLoadAddress(Target &target, lldb::addr_t value,
bool value_is_offset) {
size_t num_loaded_sections = 0;
SectionList *section_list = GetSectionList();
if (section_list) {
const size_t num_sections = section_list->GetSize();
// "value" is an offset to apply to each top level segment
for (size_t sect_idx = 0; sect_idx < num_sections; ++sect_idx) {
// Iterate through the object file sections to find all of the sections
// that size on disk (to avoid __PAGEZERO) and load them
SectionSP section_sp(section_list->GetSectionAtIndex(sect_idx));
if (section_sp && section_sp->GetFileSize() > 0 &&
!section_sp->IsThreadSpecific()) {
if (target.GetSectionLoadList().SetSectionLoadAddress(
section_sp, section_sp->GetFileAddress() + value))
++num_loaded_sections;
}
}
}
return num_loaded_sections > 0;
}
size_t ObjectFileJIT::ReadSectionData(lldb_private::Section *section,
lldb::offset_t section_offset, void *dst,
size_t dst_len) {
lldb::offset_t file_size = section->GetFileSize();
if (section_offset < file_size) {
size_t src_len = file_size - section_offset;
if (src_len > dst_len)
src_len = dst_len;
const uint8_t *src =
((uint8_t *)(uintptr_t)section->GetFileOffset()) + section_offset;
memcpy(dst, src, src_len);
return src_len;
}
return 0;
}
size_t ObjectFileJIT::ReadSectionData(
lldb_private::Section *section,
lldb_private::DataExtractor §ion_data) {
if (section->GetFileSize()) {
const void *src = (void *)(uintptr_t)section->GetFileOffset();
DataBufferSP data_sp =
std::make_shared<DataBufferHeap>(src, section->GetFileSize());
section_data.SetData(data_sp, 0, data_sp->GetByteSize());
section_data.SetByteOrder(GetByteOrder());
section_data.SetAddressByteSize(GetAddressByteSize());
return section_data.GetByteSize();
}
section_data.Clear();
return 0;
}
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