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<rdar://problem/10103468>

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I started work on being able to add symbol files after a debug session
had started with a new "target symfile add" command and quickly ran into
problems with stale Address objects in breakpoint locations that had 
lldb_private::Section pointers into modules that had been removed or 
replaced. This also let to grabbing stale modules from those sections. 
So I needed to thread harded the Address, Section and related objects.

To do this I modified the ModuleChild class to now require a ModuleSP
on initialization so that a weak reference can created. I also changed
all places that were handing out "Section *" to have them hand out SectionSP.
All ObjectFile, SymbolFile and SymbolVendors were inheriting from ModuleChild
so all of the find plug-in, static creation function and constructors now
require ModuleSP references instead of Module *. 

Address objects now have weak references to their sections which can
safely go stale when a module gets destructed. 

This checkin doesn't complete the "target symfile add" command, but it
does get us a lot clioser to being able to do such things without a high
risk of crashing or memory corruption.

llvm-svn: 151336
This commit is contained in:
Greg Clayton
2012-02-24 01:59:29 +00:00
parent da97054114
commit e72dfb321c
90 changed files with 1357 additions and 1027 deletions
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17
lldb/source/Plugins/ObjectFile/PECOFF/ObjectFilePECOFF.cpp
View File

@@ -145,11 +145,11 @@ ObjectFilePECOFF::GetPluginDescriptionStatic()
ObjectFile *
ObjectFilePECOFF::CreateInstance (Module* module, DataBufferSP& dataSP, const FileSpec* file, addr_t offset, addr_t length)
ObjectFilePECOFF::CreateInstance (const lldb::ModuleSP &module_sp, DataBufferSP& dataSP, const FileSpec* file, addr_t offset, addr_t length)
{
if (ObjectFilePECOFF::MagicBytesMatch(dataSP))
{
std::auto_ptr<ObjectFile> objfile_ap(new ObjectFilePECOFF (module, dataSP, file, offset, length));
std::auto_ptr<ObjectFile> objfile_ap(new ObjectFilePECOFF (module_sp, dataSP, file, offset, length));
if (objfile_ap.get() && objfile_ap->ParseHeader())
return objfile_ap.release();
}
@@ -157,7 +157,7 @@ ObjectFilePECOFF::CreateInstance (Module* module, DataBufferSP& dataSP, const Fi
}
ObjectFile *
ObjectFilePECOFF::CreateMemoryInstance (lldb_private::Module* module,
ObjectFilePECOFF::CreateMemoryInstance (const lldb::ModuleSP &module_sp,
lldb::DataBufferSP& data_sp,
const lldb::ProcessSP &process_sp,
lldb::addr_t header_addr)
@@ -175,12 +175,12 @@ ObjectFilePECOFF::MagicBytesMatch (DataBufferSP& dataSP)
}
ObjectFilePECOFF::ObjectFilePECOFF (Module* module,
ObjectFilePECOFF::ObjectFilePECOFF (const lldb::ModuleSP &module_sp,
DataBufferSP& dataSP,
const FileSpec* file,
addr_t offset,
addr_t length) :
ObjectFile (module, file, offset, length, dataSP),
ObjectFile (module_sp, file, offset, length, dataSP),
m_mutex (Mutex::eMutexTypeRecursive),
m_dos_header (),
m_coff_header (),
@@ -537,7 +537,7 @@ ObjectFilePECOFF::GetSymtab()
symbol.type = symtab_data.GetU16 (&offset);
symbol.storage = symtab_data.GetU8 (&offset);
symbol.naux = symtab_data.GetU8 (&offset);
Address symbol_addr(sect_list->GetSectionAtIndex(symbol.sect-1).get(), symbol.value);
Address symbol_addr(sect_list->GetSectionAtIndex(symbol.sect-1), symbol.value);
symbols[i].GetMangled ().SetValue (symbol_name.c_str(), symbol_name[0]=='_' && symbol_name[1] == 'Z');
symbols[i].SetValue(symbol_addr);
@@ -559,7 +559,7 @@ ObjectFilePECOFF::GetSectionList()
{
m_sections_ap.reset(new SectionList());
const uint32_t nsects = m_sect_headers.size();
Module *module = GetModule();
ModuleSP module_sp (GetModule());
for (uint32_t idx = 0; idx<nsects; ++idx)
{
std::string sect_name;
@@ -624,8 +624,7 @@ ObjectFilePECOFF::GetSectionList()
// Use a segment ID of the segment index shifted left by 8 so they
// never conflict with any of the sections.
SectionSP section_sp (new Section (NULL,
module, // Module to which this section belongs
SectionSP section_sp (new Section (module_sp, // Module to which this section belongs
idx + 1, // Section ID is the 1 based segment index shifted right by 8 bits as not to collide with any of the 256 section IDs that are possible
const_sect_name, // Name of this section
section_type, // This section is a container of other sections.