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//===-- SymbolLocatorDefault.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 "SymbolLocatorDefault.h"
#include <cstring>
#include <optional>
#include "Plugins/ObjectFile/wasm/ObjectFileWasm.h"
#include "lldb/Core/Debugger.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/ModuleList.h"
#include "lldb/Core/ModuleSpec.h"
#include "lldb/Core/PluginManager.h"
#include "lldb/Core/Progress.h"
#include "lldb/Core/Section.h"
#include "lldb/Host/FileSystem.h"
#include "lldb/Host/Host.h"
#include "lldb/Symbol/ObjectFile.h"
#include "lldb/Target/Target.h"
#include "lldb/Utility/ArchSpec.h"
#include "lldb/Utility/DataBuffer.h"
#include "lldb/Utility/DataExtractor.h"
#include "lldb/Utility/LLDBLog.h"
#include "lldb/Utility/Log.h"
#include "lldb/Utility/StreamString.h"
#include "lldb/Utility/Timer.h"
#include "lldb/Utility/UUID.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/ThreadPool.h"
// From MacOSX system header "mach/machine.h"
typedef int cpu_type_t;
typedef int cpu_subtype_t;
using namespace lldb;
using namespace lldb_private;
LLDB_PLUGIN_DEFINE(SymbolLocatorDefault)
SymbolLocatorDefault::SymbolLocatorDefault() : SymbolLocator() {}
void SymbolLocatorDefault::Initialize() {
PluginManager::RegisterPlugin(
GetPluginNameStatic(), GetPluginDescriptionStatic(), CreateInstance,
LocateExecutableObjectFile, LocateExecutableSymbolFile,
DownloadObjectAndSymbolFile);
}
void SymbolLocatorDefault::Terminate() {
PluginManager::UnregisterPlugin(CreateInstance);
}
llvm::StringRef SymbolLocatorDefault::GetPluginDescriptionStatic() {
return "Default symbol locator.";
}
SymbolLocator *SymbolLocatorDefault::CreateInstance() {
return new SymbolLocatorDefault();
}
std::optional<ModuleSpec> SymbolLocatorDefault::LocateExecutableObjectFile(
const ModuleSpec &module_spec) {
const FileSpec &exec_fspec = module_spec.GetFileSpec();
const ArchSpec *arch = module_spec.GetArchitecturePtr();
const UUID *uuid = module_spec.GetUUIDPtr();
LLDB_SCOPED_TIMERF(
"LocateExecutableObjectFile (file = %s, arch = %s, uuid = %p)",
exec_fspec ? exec_fspec.GetFilename().AsCString("<NULL>") : "<NULL>",
arch ? arch->GetArchitectureName() : "<NULL>", (const void *)uuid);
ModuleSpecList module_specs;
ModuleSpec matched_module_spec;
if (exec_fspec &&
ObjectFile::GetModuleSpecifications(exec_fspec, 0, 0, module_specs) &&
module_specs.FindMatchingModuleSpec(module_spec, matched_module_spec)) {
ModuleSpec result;
result.GetFileSpec() = exec_fspec;
return result;
}
return {};
}
// Keep "symbols.enable-external-lookup" description in sync with this function.
std::optional<FileSpec> SymbolLocatorDefault::LocateExecutableSymbolFile(
const ModuleSpec &module_spec, const FileSpecList &default_search_paths) {
FileSpec symbol_file_spec = module_spec.GetSymbolFileSpec();
if (symbol_file_spec.IsAbsolute() &&
FileSystem::Instance().Exists(symbol_file_spec))
return symbol_file_spec;
Progress progress(
"Locating external symbol file",
module_spec.GetFileSpec().GetFilename().AsCString("<Unknown>"));
FileSpecList debug_file_search_paths = default_search_paths;
// Add module directory.
FileSpec module_file_spec = module_spec.GetFileSpec();
// We keep the unresolved pathname if it fails.
FileSystem::Instance().ResolveSymbolicLink(module_file_spec,
module_file_spec);
ConstString file_dir = module_file_spec.GetDirectory();
{
FileSpec file_spec(file_dir.AsCString("."));
FileSystem::Instance().Resolve(file_spec);
debug_file_search_paths.AppendIfUnique(file_spec);
}
if (ModuleList::GetGlobalModuleListProperties().GetEnableExternalLookup()) {
// Add current working directory.
{
FileSpec file_spec(".");
FileSystem::Instance().Resolve(file_spec);
debug_file_search_paths.AppendIfUnique(file_spec);
}
#ifndef _WIN32
#if defined(__NetBSD__)
// Add /usr/libdata/debug directory.
{
FileSpec file_spec("/usr/libdata/debug");
FileSystem::Instance().Resolve(file_spec);
debug_file_search_paths.AppendIfUnique(file_spec);
}
#else
// Add /usr/lib/debug directory.
{
FileSpec file_spec("/usr/lib/debug");
FileSystem::Instance().Resolve(file_spec);
debug_file_search_paths.AppendIfUnique(file_spec);
}
#endif
#endif // _WIN32
}
std::string uuid_str;
const UUID &module_uuid = module_spec.GetUUID();
if (module_uuid.IsValid()) {
// Some debug files are stored in the .build-id directory like this:
// /usr/lib/debug/.build-id/ff/e7fe727889ad82bb153de2ad065b2189693315.debug
uuid_str = module_uuid.GetAsString("");
std::transform(uuid_str.begin(), uuid_str.end(), uuid_str.begin(),
::tolower);
uuid_str.insert(2, 1, '/');
uuid_str = uuid_str + ".debug";
}
size_t num_directories = debug_file_search_paths.GetSize();
for (size_t idx = 0; idx < num_directories; ++idx) {
FileSpec dirspec = debug_file_search_paths.GetFileSpecAtIndex(idx);
FileSystem::Instance().Resolve(dirspec);
if (!FileSystem::Instance().IsDirectory(dirspec))
continue;
std::vector<std::string> files;
std::string dirname = dirspec.GetPath();
if (!uuid_str.empty())
files.push_back(dirname + "/.build-id/" + uuid_str);
if (symbol_file_spec.GetFilename()) {
files.push_back(dirname + "/" +
symbol_file_spec.GetFilename().GetCString());
files.push_back(dirname + "/.debug/" +
symbol_file_spec.GetFilename().GetCString());
// Some debug files may stored in the module directory like this:
// /usr/lib/debug/usr/lib/library.so.debug
if (!file_dir.IsEmpty())
files.push_back(dirname + file_dir.AsCString() + "/" +
symbol_file_spec.GetFilename().GetCString());
}
const uint32_t num_files = files.size();
for (size_t idx_file = 0; idx_file < num_files; ++idx_file) {
const std::string &filename = files[idx_file];
FileSpec file_spec(filename);
FileSystem::Instance().Resolve(file_spec);
if (llvm::sys::fs::equivalent(file_spec.GetPath(),
module_file_spec.GetPath()))
continue;
if (FileSystem::Instance().Exists(file_spec)) {
lldb_private::ModuleSpecList specs;
const size_t num_specs =
ObjectFile::GetModuleSpecifications(file_spec, 0, 0, specs);
ModuleSpec mspec;
bool valid_mspec = false;
if (num_specs == 2) {
// Special case to handle both i386 and i686 from ObjectFilePECOFF
ModuleSpec mspec2;
if (specs.GetModuleSpecAtIndex(0, mspec) &&
specs.GetModuleSpecAtIndex(1, mspec2) &&
mspec.GetArchitecture().GetTriple().isCompatibleWith(
mspec2.GetArchitecture().GetTriple())) {
valid_mspec = true;
}
}
if (!valid_mspec) {
assert(num_specs <= 1 &&
"Symbol Vendor supports only a single architecture");
if (num_specs == 1) {
if (specs.GetModuleSpecAtIndex(0, mspec)) {
valid_mspec = true;
}
}
}
if (valid_mspec) {
// Skip the uuids check if module_uuid is invalid. For example,
// this happens for *.dwp files since at the moment llvm-dwp
// doesn't output build ids, nor does binutils dwp.
if (!module_uuid.IsValid() || module_uuid == mspec.GetUUID())
return file_spec;
}
}
}
}
return {};
}
bool SymbolLocatorDefault::DownloadObjectAndSymbolFile(ModuleSpec &module_spec,
Status &error,
bool force_lookup,
bool copy_executable) {
return false;
}
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