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762f7135e290696595b6c7233245581f59eeb07c
llvm-project/lldb/source/Symbol/ObjectFile.cpp
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Greg Clayton 762f7135e2 Don't put modules for .o files into the global shared module list. We 
used to do this because we needed to find the shared pointer for a .o
file when the .o file's module was needed in a SymbolContext since the
module in a symbol context was a shared pointer. Now that we are using
intrusive pointers we don't have this limitation anymore since any
instrusive shared pointer can be made from a pointer to an object
all on its own.

Also switched over to having the Module and SymbolVendor use shared 
pointers to their object files as had a leak on MacOSX when the 
SymbolVendor's object file wasn't the same as the Module's (debug info
in a stand along file (dSYM file)). Now everything will correctly clean
itself up when the module goes away after an executable gets rebuilt.

Now we correctly get rid of .o files that are used with the DWARF with 
debug map executables on subsequent runs since the only shared pointer
to the object files in from the DWARF symbol file debug map parser, and
when the module gets replaced, it destroys to old one along with all .o 
files. 

Also added a small optimization when using BSD archives where we will
remove old BSD containers from the shared list when they are outdated.

llvm-svn: 140002
2011-09-18 18:59:15 +00:00

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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/Log.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/PluginManager.h"
#include "lldb/Core/RegularExpression.h"
#include "lldb/Core/Timer.h"
#include "lldb/Symbol/ObjectFile.h"
#include "lldb/Symbol/ObjectContainer.h"
#include "lldb/Symbol/SymbolFile.h"
using namespace lldb;
using namespace lldb_private;
ObjectFileSP
ObjectFile::FindPlugin (Module* module, const FileSpec* file, addr_t file_offset, addr_t file_size)
{
Timer scoped_timer (__PRETTY_FUNCTION__,
"ObjectFile::FindPlugin (module = %s/%s, file = %p, file_offset = 0x%z8.8x, file_size = 0x%z8.8x)",
module->GetFileSpec().GetDirectory().AsCString(),
module->GetFileSpec().GetFilename().AsCString(),
file, file_offset, file_size);
ObjectFileSP object_file_sp;
if (module != NULL)
{
if (file)
{
if (file_size == 0)
file_size = file->GetByteSize();
if (file_size == 0)
{
// Check for archive file with format "/path/to/archive.a(object.o)"
char path_with_object[PATH_MAX*2];
module->GetFileSpec().GetPath(path_with_object, sizeof(path_with_object));
RegularExpression g_object_regex("(.*)\\(([^\\)]+)\\)$");
if (g_object_regex.Execute (path_with_object, 2))
{
FileSpec archive_file;
std::string path;
std::string object;
if (g_object_regex.GetMatchAtIndex (path_with_object, 1, path) &&
g_object_regex.GetMatchAtIndex (path_with_object, 2, object))
{
archive_file.SetFile (path.c_str(), false);
file_size = archive_file.GetByteSize();
if (file_size > 0)
module->SetFileSpecAndObjectName (archive_file, ConstString(object.c_str()));
}
}
}
// No need to delegate further if (file_offset, file_size) exceeds the total file size.
// This is the base case.
// if (file_offset + file_size > file->GetByteSize())
// return NULL;
DataBufferSP file_header_data_sp(file->ReadFileContents(file_offset, 512));
uint32_t idx;
// Check if this is a normal object file by iterating through
// all object file plugin instances.
ObjectFileCreateInstance create_object_file_callback;
for (idx = 0; (create_object_file_callback = PluginManager::GetObjectFileCreateCallbackAtIndex(idx)) != NULL; ++idx)
{
object_file_sp.reset (create_object_file_callback(module, file_header_data_sp, 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.
ObjectContainerCreateInstance create_object_container_callback;
for (idx = 0; (create_object_container_callback = PluginManager::GetObjectContainerCreateCallbackAtIndex(idx)) != NULL; ++idx)
{
std::auto_ptr<ObjectContainer> object_container_ap(create_object_container_callback(module, file_header_data_sp, 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;
}
ObjectFile::ObjectFile (Module* module,
const FileSpec *file_spec_ptr,
addr_t offset,
addr_t length,
DataBufferSP& headerDataSP) :
ModuleChild (module),
m_file (), // This file could be different from the original module's file
m_type (eTypeInvalid),
m_strata (eStrataInvalid),
m_offset (offset),
m_length (length),
m_data (headerDataSP, endian::InlHostByteOrder(), 4),
m_unwind_table (*this)
{
if (file_spec_ptr)
m_file = *file_spec_ptr;
LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_OBJECT));
if (log)
{
if (m_file)
{
log->Printf ("%p ObjectFile::ObjectFile () module = %s/%s, file = %s/%s, offset = 0x%8.8llx, size = %llu\n",
this,
m_module->GetFileSpec().GetDirectory().AsCString(),
m_module->GetFileSpec().GetFilename().AsCString(),
m_file.GetDirectory().AsCString(),
m_file.GetFilename().AsCString(),
m_offset,
m_length);
}
else
{
log->Printf ("%p ObjectFile::ObjectFile () module = %s/%s, file = <NULL>, offset = 0x%8.8llx, size = %llu\n",
this,
m_module->GetFileSpec().GetDirectory().AsCString(),
m_module->GetFileSpec().GetFilename().AsCString(),
m_offset,
m_length);
}
}
}
ObjectFile::~ObjectFile()
{
LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_OBJECT));
if (log)
{
if (m_file)
{
log->Printf ("%p ObjectFile::~ObjectFile () module = %s/%s, file = %s/%s, offset = 0x%8.8llx, size = %llu\n",
this,
m_module->GetFileSpec().GetDirectory().AsCString(),
m_module->GetFileSpec().GetFilename().AsCString(),
m_file.GetDirectory().AsCString(),
m_file.GetFilename().AsCString(),
m_offset,
m_length);
}
else
{
log->Printf ("%p ObjectFile::~ObjectFile () module = %s/%s, file = <NULL>, offset = 0x%8.8llx, size = %llu\n",
this,
m_module->GetFileSpec().GetDirectory().AsCString(),
m_module->GetFileSpec().GetFilename().AsCString(),
m_offset,
m_length);
}
}
}
bool
ObjectFile::SetModulesArchitecture (const ArchSpec &new_arch)
{
return m_module->SetArchitecture (new_arch);
}
AddressClass
ObjectFile::GetAddressClass (addr_t file_addr)
{
Symtab *symtab = GetSymtab();
if (symtab)
{
Symbol *symbol = symtab->FindSymbolContainingFileAddress(file_addr);
if (symbol)
{
const AddressRange *range_ptr = symbol->GetAddressRangePtr();
if (range_ptr)
{
const Section *section = range_ptr->GetBaseAddress().GetSection();
if (section)
{
const SectionType section_type = section->GetType();
switch (section_type)
{
case eSectionTypeInvalid: return eAddressClassUnknown;
case eSectionTypeCode: return eAddressClassCode;
case eSectionTypeContainer: return eAddressClassUnknown;
case eSectionTypeData: return eAddressClassData;
case eSectionTypeDataCString: return eAddressClassData;
case eSectionTypeDataCStringPointers: return eAddressClassData;
case eSectionTypeDataSymbolAddress: return eAddressClassData;
case eSectionTypeData4: return eAddressClassData;
case eSectionTypeData8: return eAddressClassData;
case eSectionTypeData16: return eAddressClassData;
case eSectionTypeDataPointers: return eAddressClassData;
case eSectionTypeZeroFill: return eAddressClassData;
case eSectionTypeDataObjCMessageRefs: return eAddressClassData;
case eSectionTypeDataObjCCFStrings: return eAddressClassData;
case eSectionTypeDebug: return eAddressClassDebug;
case eSectionTypeDWARFDebugAbbrev: return eAddressClassDebug;
case eSectionTypeDWARFDebugAranges: return eAddressClassDebug;
case eSectionTypeDWARFDebugFrame: return eAddressClassDebug;
case eSectionTypeDWARFDebugInfo: return eAddressClassDebug;
case eSectionTypeDWARFDebugLine: return eAddressClassDebug;
case eSectionTypeDWARFDebugLoc: return eAddressClassDebug;
case eSectionTypeDWARFDebugMacInfo: return eAddressClassDebug;
case eSectionTypeDWARFDebugPubNames: return eAddressClassDebug;
case eSectionTypeDWARFDebugPubTypes: return eAddressClassDebug;
case eSectionTypeDWARFDebugRanges: return eAddressClassDebug;
case eSectionTypeDWARFDebugStr: return eAddressClassDebug;
case eSectionTypeDWARFDebugNames: return eAddressClassDebug;
case eSectionTypeDWARFDebugTypes: return eAddressClassDebug;
case eSectionTypeEHFrame: return eAddressClassRuntime;
case eSectionTypeOther: return eAddressClassUnknown;
}
}
}
const SymbolType symbol_type = symbol->GetType();
switch (symbol_type)
{
case eSymbolTypeAny: return eAddressClassUnknown;
case eSymbolTypeAbsolute: return eAddressClassUnknown;
case eSymbolTypeExtern: return eAddressClassUnknown;
case eSymbolTypeCode: return eAddressClassCode;
case eSymbolTypeTrampoline: 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;
}
}
}
return eAddressClassUnknown;
}
ObjectFileSP
ObjectFile::GetSP ()
{
// This object contains an instrusive ref count base class so we can
// easily make a shared pointer to this object
return ObjectFileSP (this);
}
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