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llvm-project/lldb/source/Plugins/ObjectFile/JIT/ObjectFileJIT.cpp

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//===-- ObjectFileJIT.cpp ---------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/StringRef.h"
#include "ObjectFileJIT.h"
#include "lldb/Core/ArchSpec.h"
#include "lldb/Core/DataBuffer.h"
#include "lldb/Core/DataBufferHeap.h"
#include "lldb/Core/Debugger.h"
#include "lldb/Core/FileSpecList.h"
#include "lldb/Core/Log.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/ModuleSpec.h"
#include "lldb/Core/PluginManager.h"
#include "lldb/Core/RangeMap.h"
#include "lldb/Core/Section.h"
#include "lldb/Core/StreamFile.h"
#include "lldb/Core/StreamString.h"
#include "lldb/Core/Timer.h"
#include "lldb/Core/UUID.h"
#include "lldb/Host/Host.h"
#include "lldb/Host/FileSpec.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"
#ifndef __APPLE__
#include "Utility/UuidCompatibility.h"
#endif
using namespace lldb;
using namespace lldb_private;
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 NULL;
}
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 NULL;
}
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, NULL, 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)
{
lldb_private::Mutex::Locker locker(module_sp->GetMutex());
if (m_symtab_ap.get() == NULL)
{
m_symtab_ap.reset(new Symtab(this));
Mutex::Locker symtab_locker (m_symtab_ap->GetMutex());
ObjectFileJITDelegateSP delegate_sp (m_delegate_wp.lock());
if (delegate_sp)
delegate_sp->PopulateSymtab(this, *m_symtab_ap);
// TODO: get symbols from delegate
m_symtab_ap->Finalize ();
}
}
return m_symtab_ap.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_ap.get())
{
m_sections_ap.reset(new SectionList());
ObjectFileJITDelegateSP delegate_sp (m_delegate_wp.lock());
if (delegate_sp)
{
delegate_sp->PopulateSectionList(this, *m_sections_ap);
unified_section_list = *m_sections_ap;
}
}
}
void
ObjectFileJIT::Dump (Stream *s)
{
ModuleSP module_sp(GetModule());
if (module_sp)
{
lldb_private::Mutex::Locker locker(module_sp->GetMutex());
s->Printf("%p: ", static_cast<void*>(this));
s->Indent();
s->PutCString("ObjectFileJIT");
ArchSpec arch;
if (GetArchitecture(arch))
*s << ", arch = " << arch.GetArchitectureName();
s->EOL();
SectionList *sections = GetSectionList();
if (sections)
sections->Dump(s, NULL, true, UINT32_MAX);
if (m_symtab_ap.get())
m_symtab_ap->Dump(s, NULL, eSortOrderNone);
}
}
bool
ObjectFileJIT::GetUUID (lldb_private::UUID* uuid)
{
// TODO: maybe get from delegate, not needed for first pass
return false;
}
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::GetHeaderAddress ()
{
return Address();
}
ObjectFile::Type
ObjectFileJIT::CalculateType()
{
return eTypeJIT;
}
ObjectFile::Strata
ObjectFileJIT::CalculateStrata()
{
return eStrataJIT;
}
bool
ObjectFileJIT::GetArchitecture (ArchSpec &arch)
{
ObjectFileJITDelegateSP delegate_sp (m_delegate_wp.lock());
if (delegate_sp)
return delegate_sp->GetArchitecture(arch);
return false;
}
//------------------------------------------------------------------
// 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() == false)
{
if (target.GetSectionLoadList().SetSectionLoadAddress (section_sp, section_sp->GetFileAddress() + value))
++num_loaded_sections;
}
}
}
return num_loaded_sections > 0;
}
size_t
ObjectFileJIT::ReadSectionData (const lldb_private::Section *section,
lldb::offset_t section_offset,
void *dst,
size_t dst_len) const
{
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 (const lldb_private::Section *section,
lldb_private::DataExtractor& section_data) const
{
if (section->GetFileSize())
{
const void *src = (void *)(uintptr_t)section->GetFileOffset();
DataBufferSP data_sp (new lldb_private::DataBufferHeap(src, section->GetFileSize()));
if (data_sp)
{
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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