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llvm-project/lldb/source/Symbol/ObjectFile.cpp

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//===-- ObjectFile.cpp ------------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "lldb/lldb-private.h"
#include "lldb/lldb-private-log.h"
#include "lldb/Core/DataBuffer.h"
#include "lldb/Core/DataBufferHeap.h"
#include "lldb/Core/Log.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/ModuleSpec.h"
#include "lldb/Core/PluginManager.h"
#include "lldb/Core/RegularExpression.h"
#include "lldb/Core/Section.h"
#include "lldb/Core/Timer.h"
#include "lldb/Symbol/ObjectFile.h"
#include "lldb/Symbol/ObjectContainer.h"
#include "lldb/Symbol/SymbolFile.h"
#include "lldb/Target/Process.h"
#include "Plugins/ObjectContainer/BSD-Archive/ObjectContainerBSDArchive.h"
using namespace lldb;
using namespace lldb_private;
ObjectFileSP
ObjectFile::FindPlugin (const lldb::ModuleSP &module_sp,
const FileSpec* file,
lldb::offset_t file_offset,
lldb::offset_t file_size,
DataBufferSP &data_sp,
lldb::offset_t &data_offset)
{
ObjectFileSP object_file_sp;
if (module_sp)
{
Timer scoped_timer (__PRETTY_FUNCTION__,
"ObjectFile::FindPlugin (module = %s, file = %p, file_offset = 0x%8.8" PRIx64 ", file_size = 0x%8.8" PRIx64 ")",
module_sp->GetFileSpec().GetPath().c_str(),
file, (uint64_t) file_offset, (uint64_t) file_size);
if (file)
{
FileSpec archive_file;
ObjectContainerCreateInstance create_object_container_callback;
const bool file_exists = file->Exists();
if (!data_sp)
{
// We have an object name which most likely means we have
// a .o file in a static archive (.a file). Try and see if
// we have a cached archive first without reading any data
// first
if (file_exists && module_sp->GetObjectName())
{
for (uint32_t idx = 0; (create_object_container_callback = PluginManager::GetObjectContainerCreateCallbackAtIndex(idx)) != NULL; ++idx)
{
std::unique_ptr<ObjectContainer> object_container_ap(create_object_container_callback(module_sp, data_sp, data_offset, file, file_offset, file_size));
if (object_container_ap.get())
object_file_sp = object_container_ap->GetObjectFile(file);
if (object_file_sp.get())
return object_file_sp;
}
}
// Ok, we didn't find any containers that have a named object, now
// lets read the first 512 bytes from the file so the object file
// and object container plug-ins can use these bytes to see if they
// can parse this file.
if (file_size > 0)
{
data_sp = file->ReadFileContents(file_offset, std::min<size_t>(512, file_size));
data_offset = 0;
}
}
if (!data_sp || data_sp->GetByteSize() == 0)
{
// Check for archive file with format "/path/to/archive.a(object.o)"
char path_with_object[PATH_MAX*2];
module_sp->GetFileSpec().GetPath(path_with_object, sizeof(path_with_object));
ConstString archive_object;
const bool must_exist = true;
if (ObjectFile::SplitArchivePathWithObject (path_with_object, archive_file, archive_object, must_exist))
{
file_size = archive_file.GetByteSize();
if (file_size > 0)
{
file = &archive_file;
module_sp->SetFileSpecAndObjectName (archive_file, archive_object);
// Check if this is a object container by iterating through all object
// container plugin instances and then trying to get an object file
// from the container plugins since we had a name. Also, don't read
// ANY data in case there is data cached in the container plug-ins
// (like BSD archives caching the contained objects within an file).
for (uint32_t idx = 0; (create_object_container_callback = PluginManager::GetObjectContainerCreateCallbackAtIndex(idx)) != NULL; ++idx)
{
std::unique_ptr<ObjectContainer> object_container_ap(create_object_container_callback(module_sp, data_sp, data_offset, file, file_offset, file_size));
if (object_container_ap.get())
object_file_sp = object_container_ap->GetObjectFile(file);
if (object_file_sp.get())
return object_file_sp;
}
// We failed to find any cached object files in the container
// plug-ins, so lets read the first 512 bytes and try again below...
data_sp = archive_file.ReadFileContents(file_offset, 512);
}
}
}
if (data_sp && data_sp->GetByteSize() > 0)
{
// Check if this is a normal object file by iterating through
// all object file plugin instances.
ObjectFileCreateInstance create_object_file_callback;
for (uint32_t idx = 0; (create_object_file_callback = PluginManager::GetObjectFileCreateCallbackAtIndex(idx)) != NULL; ++idx)
{
object_file_sp.reset (create_object_file_callback(module_sp, data_sp, data_offset, file, file_offset, file_size));
if (object_file_sp.get())
return object_file_sp;
}
// Check if this is a object container by iterating through
// all object container plugin instances and then trying to get
// an object file from the container.
for (uint32_t idx = 0; (create_object_container_callback = PluginManager::GetObjectContainerCreateCallbackAtIndex(idx)) != NULL; ++idx)
{
std::unique_ptr<ObjectContainer> object_container_ap(create_object_container_callback(module_sp, data_sp, data_offset, file, file_offset, file_size));
if (object_container_ap.get())
object_file_sp = object_container_ap->GetObjectFile(file);
if (object_file_sp.get())
return object_file_sp;
}
}
}
}
// We didn't find it, so clear our shared pointer in case it
// contains anything and return an empty shared pointer
object_file_sp.reset();
return object_file_sp;
}
ObjectFileSP
ObjectFile::FindPlugin (const lldb::ModuleSP &module_sp,
const ProcessSP &process_sp,
lldb::addr_t header_addr,
DataBufferSP &data_sp)
{
ObjectFileSP object_file_sp;
if (module_sp)
{
Timer scoped_timer (__PRETTY_FUNCTION__,
"ObjectFile::FindPlugin (module = %s, process = %p, header_addr = 0x%" PRIx64 ")",
module_sp->GetFileSpec().GetPath().c_str(),
process_sp.get(), header_addr);
uint32_t idx;
// Check if this is a normal object file by iterating through
// all object file plugin instances.
ObjectFileCreateMemoryInstance create_callback;
for (idx = 0; (create_callback = PluginManager::GetObjectFileCreateMemoryCallbackAtIndex(idx)) != NULL; ++idx)
{
object_file_sp.reset (create_callback(module_sp, data_sp, process_sp, header_addr));
if (object_file_sp.get())
return object_file_sp;
}
}
// We didn't find it, so clear our shared pointer in case it
// contains anything and return an empty shared pointer
object_file_sp.reset();
return object_file_sp;
}
size_t
ObjectFile::GetModuleSpecifications (const FileSpec &file,
lldb::offset_t file_offset,
lldb::offset_t file_size,
ModuleSpecList &specs)
{
DataBufferSP data_sp (file.ReadFileContents(file_offset, 512));
if (data_sp)
{
if (file_size == 0)
{
const lldb::offset_t actual_file_size = file.GetByteSize();
if (actual_file_size > file_offset)
file_size = actual_file_size - file_offset;
}
return ObjectFile::GetModuleSpecifications (file, // file spec
data_sp, // data bytes
0, // data offset
file_offset,// file offset
file_size, // file length
specs);
}
return 0;
}
size_t
ObjectFile::GetModuleSpecifications (const lldb_private::FileSpec& file,
lldb::DataBufferSP& data_sp,
lldb::offset_t data_offset,
lldb::offset_t file_offset,
lldb::offset_t file_size,
lldb_private::ModuleSpecList &specs)
{
const size_t initial_count = specs.GetSize();
ObjectFileGetModuleSpecifications callback;
uint32_t i;
// Try the ObjectFile plug-ins
for (i = 0; (callback = PluginManager::GetObjectFileGetModuleSpecificationsCallbackAtIndex(i)) != NULL; ++i)
{
if (callback (file, data_sp, data_offset, file_offset, file_size, specs) > 0)
return specs.GetSize() - initial_count;
}
// Try the ObjectContainer plug-ins
for (i = 0; (callback = PluginManager::GetObjectContainerGetModuleSpecificationsCallbackAtIndex(i)) != NULL; ++i)
{
if (callback (file, data_sp, data_offset, file_offset, file_size, specs) > 0)
return specs.GetSize() - initial_count;
}
return 0;
}
ObjectFile::ObjectFile (const lldb::ModuleSP &module_sp,
const FileSpec *file_spec_ptr,
lldb::offset_t file_offset,
lldb::offset_t length,
lldb::DataBufferSP& data_sp,
lldb::offset_t data_offset
) :
ModuleChild (module_sp),
m_file (), // This file could be different from the original module's file
m_type (eTypeInvalid),
m_strata (eStrataInvalid),
m_file_offset (file_offset),
m_length (length),
m_data (),
m_unwind_table (*this),
m_process_wp(),
m_memory_addr (LLDB_INVALID_ADDRESS),
m_sections_ap(),
m_symtab_ap ()
{
if (file_spec_ptr)
m_file = *file_spec_ptr;
if (data_sp)
m_data.SetData (data_sp, data_offset, length);
Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_OBJECT));
if (log)
{
if (m_file)
{
log->Printf ("%p ObjectFile::ObjectFile() module = %p (%s), file = %s, file_offset = 0x%8.8" PRIx64 ", size = %" PRIu64,
this,
module_sp.get(),
module_sp->GetSpecificationDescription().c_str(),
m_file.GetPath().c_str(),
m_file_offset,
m_length);
}
else
{
log->Printf ("%p ObjectFile::ObjectFile() module = %p (%s), file = <NULL>, file_offset = 0x%8.8" PRIx64 ", size = %" PRIu64,
this,
module_sp.get(),
module_sp->GetSpecificationDescription().c_str(),
m_file_offset,
m_length);
}
}
}
ObjectFile::ObjectFile (const lldb::ModuleSP &module_sp,
const ProcessSP &process_sp,
lldb::addr_t header_addr,
DataBufferSP& header_data_sp) :
ModuleChild (module_sp),
m_file (),
m_type (eTypeInvalid),
m_strata (eStrataInvalid),
m_file_offset (0),
m_length (0),
m_data (),
m_unwind_table (*this),
m_process_wp (process_sp),
m_memory_addr (header_addr),
m_sections_ap(),
m_symtab_ap ()
{
if (header_data_sp)
m_data.SetData (header_data_sp, 0, header_data_sp->GetByteSize());
Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_OBJECT));
if (log)
{
log->Printf ("%p ObjectFile::ObjectFile() module = %p (%s), process = %p, header_addr = 0x%" PRIx64,
this,
module_sp.get(),
module_sp->GetSpecificationDescription().c_str(),
process_sp.get(),
m_memory_addr);
}
}
ObjectFile::~ObjectFile()
{
Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_OBJECT));
if (log)
log->Printf ("%p ObjectFile::~ObjectFile ()\n", this);
}
bool
ObjectFile::SetModulesArchitecture (const ArchSpec &new_arch)
{
ModuleSP module_sp (GetModule());
if (module_sp)
return module_sp->SetArchitecture (new_arch);
return false;
}
AddressClass
ObjectFile::GetAddressClass (addr_t file_addr)
{
Symtab *symtab = GetSymtab();
if (symtab)
{
Symbol *symbol = symtab->FindSymbolContainingFileAddress(file_addr);
if (symbol)
{
if (symbol->ValueIsAddress())
{
const SectionSP section_sp (symbol->GetAddress().GetSection());
if (section_sp)
{
const SectionType section_type = section_sp->GetType();
switch (section_type)
{
case eSectionTypeInvalid: return eAddressClassUnknown;
case eSectionTypeCode: return eAddressClassCode;
case eSectionTypeContainer: return eAddressClassUnknown;
case eSectionTypeData:
case eSectionTypeDataCString:
case eSectionTypeDataCStringPointers:
case eSectionTypeDataSymbolAddress:
case eSectionTypeData4:
case eSectionTypeData8:
case eSectionTypeData16:
case eSectionTypeDataPointers:
case eSectionTypeZeroFill:
case eSectionTypeDataObjCMessageRefs:
case eSectionTypeDataObjCCFStrings:
return eAddressClassData;
case eSectionTypeDebug:
case eSectionTypeDWARFDebugAbbrev:
case eSectionTypeDWARFDebugAranges:
case eSectionTypeDWARFDebugFrame:
case eSectionTypeDWARFDebugInfo:
case eSectionTypeDWARFDebugLine:
case eSectionTypeDWARFDebugLoc:
case eSectionTypeDWARFDebugMacInfo:
case eSectionTypeDWARFDebugPubNames:
case eSectionTypeDWARFDebugPubTypes:
case eSectionTypeDWARFDebugRanges:
case eSectionTypeDWARFDebugStr:
case eSectionTypeDWARFAppleNames:
case eSectionTypeDWARFAppleTypes:
case eSectionTypeDWARFAppleNamespaces:
case eSectionTypeDWARFAppleObjC:
return eAddressClassDebug;
case eSectionTypeEHFrame: return eAddressClassRuntime;
case eSectionTypeELFSymbolTable:
case eSectionTypeELFDynamicSymbols:
case eSectionTypeELFRelocationEntries:
case eSectionTypeELFDynamicLinkInfo:
case eSectionTypeOther: return eAddressClassUnknown;
}
}
}
const SymbolType symbol_type = symbol->GetType();
switch (symbol_type)
{
case eSymbolTypeAny: return eAddressClassUnknown;
case eSymbolTypeAbsolute: return eAddressClassUnknown;
case eSymbolTypeCode: return eAddressClassCode;
case eSymbolTypeTrampoline: return eAddressClassCode;
case eSymbolTypeResolver: return eAddressClassCode;
case eSymbolTypeData: return eAddressClassData;
case eSymbolTypeRuntime: return eAddressClassRuntime;
case eSymbolTypeException: return eAddressClassRuntime;
case eSymbolTypeSourceFile: return eAddressClassDebug;
case eSymbolTypeHeaderFile: return eAddressClassDebug;
case eSymbolTypeObjectFile: return eAddressClassDebug;
case eSymbolTypeCommonBlock: return eAddressClassDebug;
case eSymbolTypeBlock: return eAddressClassDebug;
case eSymbolTypeLocal: return eAddressClassData;
case eSymbolTypeParam: return eAddressClassData;
case eSymbolTypeVariable: return eAddressClassData;
case eSymbolTypeVariableType: return eAddressClassDebug;
case eSymbolTypeLineEntry: return eAddressClassDebug;
case eSymbolTypeLineHeader: return eAddressClassDebug;
case eSymbolTypeScopeBegin: return eAddressClassDebug;
case eSymbolTypeScopeEnd: return eAddressClassDebug;
case eSymbolTypeAdditional: return eAddressClassUnknown;
case eSymbolTypeCompiler: return eAddressClassDebug;
case eSymbolTypeInstrumentation:return eAddressClassDebug;
case eSymbolTypeUndefined: return eAddressClassUnknown;
case eSymbolTypeObjCClass: return eAddressClassRuntime;
case eSymbolTypeObjCMetaClass: return eAddressClassRuntime;
case eSymbolTypeObjCIVar: return eAddressClassRuntime;
}
}
}
return eAddressClassUnknown;
}
DataBufferSP
ObjectFile::ReadMemory (const ProcessSP &process_sp, lldb::addr_t addr, size_t byte_size)
{
DataBufferSP data_sp;
if (process_sp)
{
std::unique_ptr<DataBufferHeap> data_ap (new DataBufferHeap (byte_size, 0));
Error error;
const size_t bytes_read = process_sp->ReadMemory (addr,
data_ap->GetBytes(),
data_ap->GetByteSize(),
error);
if (bytes_read == byte_size)
data_sp.reset (data_ap.release());
}
return data_sp;
}
size_t
ObjectFile::GetData (off_t offset, size_t length, DataExtractor &data) const
{
// The entire file has already been mmap'ed into m_data, so just copy from there
// as the back mmap buffer will be shared with shared pointers.
return data.SetData (m_data, offset, length);
}
size_t
ObjectFile::CopyData (off_t offset, size_t length, void *dst) const
{
// The entire file has already been mmap'ed into m_data, so just copy from there
// Note that the data remains in target byte order.
return m_data.CopyData (offset, length, dst);
}
size_t
ObjectFile::ReadSectionData (const Section *section, off_t section_offset, void *dst, size_t dst_len) const
{
// If some other objectfile owns this data, pass this to them.
if (section->GetObjectFile() != this)
return section->GetObjectFile()->ReadSectionData (section, section_offset, dst, dst_len);
if (IsInMemory())
{
ProcessSP process_sp (m_process_wp.lock());
if (process_sp)
{
Error error;
const addr_t base_load_addr = section->GetLoadBaseAddress (&process_sp->GetTarget());
if (base_load_addr != LLDB_INVALID_ADDRESS)
return process_sp->ReadMemory (base_load_addr + section_offset, dst, dst_len, error);
}
}
else
{
const uint64_t section_file_size = section->GetFileSize();
if (section_offset < section_file_size)
{
const uint64_t section_bytes_left = section_file_size - section_offset;
uint64_t section_dst_len = dst_len;
if (section_dst_len > section_bytes_left)
section_dst_len = section_bytes_left;
return CopyData (section->GetFileOffset() + section_offset, section_dst_len, dst);
}
else
{
if (section->GetType() == eSectionTypeZeroFill)
{
const uint64_t section_size = section->GetByteSize();
const uint64_t section_bytes_left = section_size - section_offset;
uint64_t section_dst_len = dst_len;
if (section_dst_len > section_bytes_left)
section_dst_len = section_bytes_left;
memset(dst, 0, section_dst_len);
return section_dst_len;
}
}
}
return 0;
}
//----------------------------------------------------------------------
// Get the section data the file on disk
//----------------------------------------------------------------------
size_t
ObjectFile::ReadSectionData (const Section *section, DataExtractor& section_data) const
{
// If some other objectfile owns this data, pass this to them.
if (section->GetObjectFile() != this)
return section->GetObjectFile()->ReadSectionData (section, section_data);
if (IsInMemory())
{
ProcessSP process_sp (m_process_wp.lock());
if (process_sp)
{
const addr_t base_load_addr = section->GetLoadBaseAddress (&process_sp->GetTarget());
if (base_load_addr != LLDB_INVALID_ADDRESS)
{
DataBufferSP data_sp (ReadMemory (process_sp, base_load_addr, section->GetByteSize()));
if (data_sp)
{
section_data.SetData (data_sp, 0, data_sp->GetByteSize());
section_data.SetByteOrder (process_sp->GetByteOrder());
section_data.SetAddressByteSize (process_sp->GetAddressByteSize());
return section_data.GetByteSize();
}
}
}
}
else
{
// The object file now contains a full mmap'ed copy of the object file data, so just use this
return MemoryMapSectionData (section, section_data);
}
section_data.Clear();
return 0;
}
size_t
ObjectFile::MemoryMapSectionData (const Section *section, DataExtractor& section_data) const
{
// If some other objectfile owns this data, pass this to them.
if (section->GetObjectFile() != this)
return section->GetObjectFile()->MemoryMapSectionData (section, section_data);
if (IsInMemory())
{
return ReadSectionData (section, section_data);
}
else
{
// The object file now contains a full mmap'ed copy of the object file data, so just use this
return GetData(section->GetFileOffset(), section->GetFileSize(), section_data);
}
section_data.Clear();
return 0;
}
bool
ObjectFile::SplitArchivePathWithObject (const char *path_with_object, FileSpec &archive_file, ConstString &archive_object, bool must_exist)
{
RegularExpression g_object_regex("(.*)\\(([^\\)]+)\\)$");
RegularExpression::Match regex_match(2);
if (g_object_regex.Execute (path_with_object, &regex_match))
{
std::string path;
std::string obj;
if (regex_match.GetMatchAtIndex (path_with_object, 1, path) &&
regex_match.GetMatchAtIndex (path_with_object, 2, obj))
{
archive_file.SetFile (path.c_str(), false);
archive_object.SetCString(obj.c_str());
if (must_exist && !archive_file.Exists())
return false;
return true;
}
}
return false;
}
void
ObjectFile::ClearSymtab ()
{
ModuleSP module_sp(GetModule());
if (module_sp)
{
lldb_private::Mutex::Locker locker(module_sp->GetMutex());
Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_OBJECT));
if (log)
{
log->Printf ("%p ObjectFile::ClearSymtab () symtab = %p",
this,
m_symtab_ap.get());
}
m_symtab_ap.reset();
}
}
SectionList *
ObjectFile::GetSectionList()
{
if (m_sections_ap.get() == NULL)
{
ModuleSP module_sp(GetModule());
if (module_sp)
CreateSections(*module_sp->GetUnifiedSectionList());
}
return m_sections_ap.get();
}
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