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//===-- SymbolVendorELF.cpp -----------------------------------------------===//
//
// 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 "SymbolVendorELF.h"
#include <cstring>
#include "Plugins/ObjectFile/ELF/ObjectFileELF.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/ModuleSpec.h"
#include "lldb/Core/PluginManager.h"
#include "lldb/Core/Section.h"
#include "lldb/Host/Host.h"
#include "lldb/Symbol/ObjectFile.h"
#include "lldb/Target/Target.h"
#include "lldb/Utility/StreamString.h"
#include "lldb/Utility/Timer.h"
using namespace lldb;
using namespace lldb_private;
LLDB_PLUGIN_DEFINE(SymbolVendorELF)
// SymbolVendorELF constructor
SymbolVendorELF::SymbolVendorELF(const lldb::ModuleSP &module_sp)
: SymbolVendor(module_sp) {}
void SymbolVendorELF::Initialize() {
PluginManager::RegisterPlugin(GetPluginNameStatic(),
GetPluginDescriptionStatic(), CreateInstance);
}
void SymbolVendorELF::Terminate() {
PluginManager::UnregisterPlugin(CreateInstance);
}
llvm::StringRef SymbolVendorELF::GetPluginDescriptionStatic() {
return "Symbol vendor for ELF that looks for dSYM files that match "
"executables.";
}
// If this is needed elsewhere, it can be exported/moved.
static bool IsDwpSymbolFile(const lldb::ModuleSP &module_sp,
const FileSpec &file_spec) {
DataBufferSP dwp_file_data_sp;
lldb::offset_t dwp_file_data_offset = 0;
// Try to create an ObjectFile from the file_spec.
ObjectFileSP dwp_obj_file = ObjectFile::FindPlugin(
module_sp, &file_spec, 0, FileSystem::Instance().GetByteSize(file_spec),
dwp_file_data_sp, dwp_file_data_offset);
// The presence of a debug_cu_index section is the key identifying feature of
// a DWP file. Make sure we don't fill in the section list on dwp_obj_file
// (by calling GetSectionList(false)) as this function could be called before
// we may have all the symbol files collected and available.
return dwp_obj_file && ObjectFileELF::classof(dwp_obj_file.get()) &&
dwp_obj_file->GetSectionList(false)->FindSectionByType(
eSectionTypeDWARFDebugCuIndex, false);
}
// CreateInstance
//
// Platforms can register a callback to use when creating symbol vendors to
// allow for complex debug information file setups, and to also allow for
// finding separate debug information files.
SymbolVendor *
SymbolVendorELF::CreateInstance(const lldb::ModuleSP &module_sp,
lldb_private::Stream *feedback_strm) {
if (!module_sp)
return nullptr;
ObjectFileELF *obj_file =
llvm::dyn_cast_or_null<ObjectFileELF>(module_sp->GetObjectFile());
if (!obj_file)
return nullptr;
lldb_private::UUID uuid = obj_file->GetUUID();
if (!uuid)
return nullptr;
// If the main object file already contains debug info, then we are done.
if (obj_file->GetSectionList()->FindSectionByType(
lldb::eSectionTypeDWARFDebugInfo, true))
return nullptr;
// If the module specified a filespec, use that.
FileSpec fspec = module_sp->GetSymbolFileFileSpec();
// Otherwise, try gnu_debuglink, if one exists.
if (!fspec)
fspec = obj_file->GetDebugLink().value_or(FileSpec());
LLDB_SCOPED_TIMERF("SymbolVendorELF::CreateInstance (module = %s)",
module_sp->GetFileSpec().GetPath().c_str());
ModuleSpec module_spec;
module_spec.GetFileSpec() = obj_file->GetFileSpec();
FileSystem::Instance().Resolve(module_spec.GetFileSpec());
module_spec.GetSymbolFileSpec() = fspec;
module_spec.GetUUID() = uuid;
FileSpecList search_paths = Target::GetDefaultDebugFileSearchPaths();
FileSpec dsym_fspec =
PluginManager::LocateExecutableSymbolFile(module_spec, search_paths);
if (!dsym_fspec || IsDwpSymbolFile(module_sp, dsym_fspec)) {
// If we have a stripped binary or if we have a DWP file, SymbolLocator
// plugins may be able to give us an unstripped binary or an
// 'only-keep-debug' stripped file.
ModuleSpec unstripped_spec =
PluginManager::LocateExecutableObjectFile(module_spec);
if (!unstripped_spec)
return nullptr;
// The default SymbolLocator plugin returns the original binary if no other
// plugin finds something better.
if (unstripped_spec.GetFileSpec() == module_spec.GetFileSpec())
return nullptr;
dsym_fspec = unstripped_spec.GetFileSpec();
}
DataBufferSP dsym_file_data_sp;
lldb::offset_t dsym_file_data_offset = 0;
ObjectFileSP dsym_objfile_sp = ObjectFile::FindPlugin(
module_sp, &dsym_fspec, 0, FileSystem::Instance().GetByteSize(dsym_fspec),
dsym_file_data_sp, dsym_file_data_offset);
if (!dsym_objfile_sp)
return nullptr;
// This objfile is for debugging purposes. Sadly, ObjectFileELF won't
// be able to figure this out consistently as the symbol file may not
// have stripped the code sections, etc.
dsym_objfile_sp->SetType(ObjectFile::eTypeDebugInfo);
SymbolVendorELF *symbol_vendor = new SymbolVendorELF(module_sp);
// Get the module unified section list and add our debug sections to
// that.
SectionList *module_section_list = module_sp->GetSectionList();
SectionList *objfile_section_list = dsym_objfile_sp->GetSectionList();
if (!module_section_list || !objfile_section_list)
return nullptr;
static const SectionType g_sections[] = {
eSectionTypeDWARFDebugAbbrev, eSectionTypeDWARFDebugAddr,
eSectionTypeDWARFDebugAranges, eSectionTypeDWARFDebugCuIndex,
eSectionTypeDWARFDebugFrame, eSectionTypeDWARFDebugInfo,
eSectionTypeDWARFDebugLine, eSectionTypeDWARFDebugLineStr,
eSectionTypeDWARFDebugLoc, eSectionTypeDWARFDebugLocLists,
eSectionTypeDWARFDebugMacInfo, eSectionTypeDWARFDebugMacro,
eSectionTypeDWARFDebugNames, eSectionTypeDWARFDebugPubNames,
eSectionTypeDWARFDebugPubTypes, eSectionTypeDWARFDebugRanges,
eSectionTypeDWARFDebugRngLists, eSectionTypeDWARFDebugStr,
eSectionTypeDWARFDebugStrOffsets, eSectionTypeDWARFDebugTypes,
eSectionTypeELFSymbolTable, eSectionTypeDWARFGNUDebugAltLink,
};
for (SectionType section_type : g_sections) {
if (SectionSP section_sp =
objfile_section_list->FindSectionByType(section_type, true)) {
if (SectionSP module_section_sp =
module_section_list->FindSectionByType(section_type, true))
module_section_list->ReplaceSection(module_section_sp->GetID(),
section_sp);
else
module_section_list->AddSection(section_sp);
}
}
symbol_vendor->AddSymbolFileRepresentation(dsym_objfile_sp);
return symbol_vendor;
}
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