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

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//===-- LocateSymbolFile.cpp ------------------------------------*- C++ -*-===//
//
// 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 "lldb/Symbol/LocateSymbolFile.h"
#include "lldb/Core/ModuleList.h"
#include "lldb/Core/ModuleSpec.h"
#include "lldb/Host/FileSystem.h"
#include "lldb/Symbol/ObjectFile.h"
#include "lldb/Utility/ArchSpec.h"
#include "lldb/Utility/DataBuffer.h"
#include "lldb/Utility/DataExtractor.h"
#include "lldb/Utility/Log.h"
#include "lldb/Utility/StreamString.h"
#include "lldb/Utility/Timer.h"
#include "lldb/Utility/UUID.h"
#include "llvm/Support/FileSystem.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;
#if defined(__APPLE__)
// Forward declaration of method defined in source/Host/macosx/Symbols.cpp
int LocateMacOSXFilesUsingDebugSymbols(const ModuleSpec &module_spec,
ModuleSpec &return_module_spec);
#else
int LocateMacOSXFilesUsingDebugSymbols(const ModuleSpec &module_spec,
ModuleSpec &return_module_spec) {
// Cannot find MacOSX files using debug symbols on non MacOSX.
return 0;
}
#endif
static bool FileAtPathContainsArchAndUUID(const FileSpec &file_fspec,
const ArchSpec *arch,
const lldb_private::UUID *uuid) {
ModuleSpecList module_specs;
if (ObjectFile::GetModuleSpecifications(file_fspec, 0, 0, module_specs)) {
ModuleSpec spec;
for (size_t i = 0; i < module_specs.GetSize(); ++i) {
bool got_spec = module_specs.GetModuleSpecAtIndex(i, spec);
UNUSED_IF_ASSERT_DISABLED(got_spec);
assert(got_spec);
if ((uuid == nullptr || (spec.GetUUIDPtr() && spec.GetUUID() == *uuid)) &&
(arch == nullptr ||
(spec.GetArchitecturePtr() &&
spec.GetArchitecture().IsCompatibleMatch(*arch)))) {
return true;
}
}
}
return false;
}
// Given a binary exec_fspec, and a ModuleSpec with an architecture/uuid,
// return true if there is a matching dSYM bundle next to the exec_fspec,
// and return that value in dsym_fspec.
// If there is a .dSYM.yaa compressed archive next to the exec_fspec,
// call through Symbols::DownloadObjectAndSymbolFile to download the
// expanded/uncompressed dSYM and return that filepath in dsym_fspec.
static bool LookForDsymNextToExecutablePath(const ModuleSpec &mod_spec,
const FileSpec &exec_fspec,
FileSpec &dsym_fspec) {
ConstString filename = exec_fspec.GetFilename();
FileSpec dsym_directory = exec_fspec;
dsym_directory.RemoveLastPathComponent();
std::string dsym_filename = filename.AsCString();
dsym_filename += ".dSYM";
dsym_directory.AppendPathComponent(dsym_filename);
dsym_directory.AppendPathComponent("Contents");
dsym_directory.AppendPathComponent("Resources");
dsym_directory.AppendPathComponent("DWARF");
if (FileSystem::Instance().Exists(dsym_directory)) {
// See if the binary name exists in the dSYM DWARF
// subdir.
dsym_fspec = dsym_directory;
dsym_fspec.AppendPathComponent(filename.AsCString());
if (FileSystem::Instance().Exists(dsym_fspec) &&
FileAtPathContainsArchAndUUID(dsym_fspec, mod_spec.GetArchitecturePtr(),
mod_spec.GetUUIDPtr())) {
return true;
}
// See if we have "../CF.framework" - so we'll look for
// CF.framework.dSYM/Contents/Resources/DWARF/CF
// We need to drop the last suffix after '.' to match
// 'CF' in the DWARF subdir.
std::string binary_name(filename.AsCString());
auto last_dot = binary_name.find_last_of('.');
if (last_dot != std::string::npos) {
binary_name.erase(last_dot);
dsym_fspec = dsym_directory;
dsym_fspec.AppendPathComponent(binary_name);
if (FileSystem::Instance().Exists(dsym_fspec) &&
FileAtPathContainsArchAndUUID(dsym_fspec,
mod_spec.GetArchitecturePtr(),
mod_spec.GetUUIDPtr())) {
return true;
}
}
}
// See if we have a .dSYM.yaa next to this executable path.
FileSpec dsym_yaa_fspec = exec_fspec;
dsym_yaa_fspec.RemoveLastPathComponent();
std::string dsym_yaa_filename = filename.AsCString();
dsym_yaa_filename += ".dSYM.yaa";
dsym_yaa_fspec.AppendPathComponent(dsym_yaa_filename);
if (FileSystem::Instance().Exists(dsym_yaa_fspec)) {
ModuleSpec mutable_mod_spec = mod_spec;
if (Symbols::DownloadObjectAndSymbolFile(mutable_mod_spec, true) &&
FileSystem::Instance().Exists(mutable_mod_spec.GetSymbolFileSpec())) {
dsym_fspec = mutable_mod_spec.GetSymbolFileSpec();
return true;
}
}
return false;
}
// Given a ModuleSpec with a FileSpec and optionally uuid/architecture
// filled in, look for a .dSYM bundle next to that binary. Returns true
// if a .dSYM bundle is found, and that path is returned in the dsym_fspec
// FileSpec.
//
// This routine looks a few directory layers above the given exec_path -
// exec_path might be /System/Library/Frameworks/CF.framework/CF and the
// dSYM might be /System/Library/Frameworks/CF.framework.dSYM.
//
// If there is a .dSYM.yaa compressed archive found next to the binary,
// we'll call DownloadObjectAndSymbolFile to expand it into a plain .dSYM
static bool LocateDSYMInVincinityOfExecutable(const ModuleSpec &module_spec,
FileSpec &dsym_fspec) {
Log *log = lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_HOST);
const FileSpec &exec_fspec = module_spec.GetFileSpec();
if (exec_fspec) {
if (::LookForDsymNextToExecutablePath(module_spec, exec_fspec,
dsym_fspec)) {
if (log) {
log->Printf("dSYM with matching UUID & arch found at %s",
dsym_fspec.GetPath().c_str());
}
return true;
} else {
FileSpec parent_dirs = exec_fspec;
// Remove the binary name from the FileSpec
parent_dirs.RemoveLastPathComponent();
// Add a ".dSYM" name to each directory component of the path,
// stripping off components. e.g. we may have a binary like
// /S/L/F/Foundation.framework/Versions/A/Foundation and
// /S/L/F/Foundation.framework.dSYM
//
// so we'll need to start with
// /S/L/F/Foundation.framework/Versions/A, add the .dSYM part to the
// "A", and if that doesn't exist, strip off the "A" and try it again
// with "Versions", etc., until we find a dSYM bundle or we've
// stripped off enough path components that there's no need to
// continue.
for (int i = 0; i < 4; i++) {
// Does this part of the path have a "." character - could it be a
// bundle's top level directory?
const char *fn = parent_dirs.GetFilename().AsCString();
if (fn == nullptr)
break;
if (::strchr(fn, '.') != nullptr) {
if (::LookForDsymNextToExecutablePath(module_spec, parent_dirs,
dsym_fspec)) {
if (log) {
log->Printf("dSYM with matching UUID & arch found at %s",
dsym_fspec.GetPath().c_str());
}
return true;
}
}
parent_dirs.RemoveLastPathComponent();
}
}
}
dsym_fspec.Clear();
return false;
}
static FileSpec LocateExecutableSymbolFileDsym(const ModuleSpec &module_spec) {
const FileSpec *exec_fspec = module_spec.GetFileSpecPtr();
const ArchSpec *arch = module_spec.GetArchitecturePtr();
const UUID *uuid = module_spec.GetUUIDPtr();
static Timer::Category func_cat(LLVM_PRETTY_FUNCTION);
Timer scoped_timer(
func_cat,
"LocateExecutableSymbolFileDsym (file = %s, arch = %s, uuid = %p)",
exec_fspec ? exec_fspec->GetFilename().AsCString("<NULL>") : "<NULL>",
arch ? arch->GetArchitectureName() : "<NULL>", (const void *)uuid);
FileSpec symbol_fspec;
ModuleSpec dsym_module_spec;
// First try and find the dSYM in the same directory as the executable or in
// an appropriate parent directory
if (!LocateDSYMInVincinityOfExecutable(module_spec, symbol_fspec)) {
// We failed to easily find the dSYM above, so use DebugSymbols
LocateMacOSXFilesUsingDebugSymbols(module_spec, dsym_module_spec);
} else {
dsym_module_spec.GetSymbolFileSpec() = symbol_fspec;
}
return dsym_module_spec.GetSymbolFileSpec();
}
ModuleSpec Symbols::LocateExecutableObjectFile(const ModuleSpec &module_spec) {
ModuleSpec result;
const FileSpec *exec_fspec = module_spec.GetFileSpecPtr();
const ArchSpec *arch = module_spec.GetArchitecturePtr();
const UUID *uuid = module_spec.GetUUIDPtr();
static Timer::Category func_cat(LLVM_PRETTY_FUNCTION);
Timer scoped_timer(
func_cat, "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)) {
result.GetFileSpec() = exec_fspec;
} else {
LocateMacOSXFilesUsingDebugSymbols(module_spec, result);
}
return result;
}
// Keep "symbols.enable-external-lookup" description in sync with this function.
FileSpec
Symbols::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;
const char *symbol_filename = symbol_file_spec.GetFilename().AsCString();
if (symbol_filename && symbol_filename[0]) {
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();
files.push_back(dirname + "/" + symbol_filename);
files.push_back(dirname + "/.debug/" + symbol_filename);
files.push_back(dirname + "/.build-id/" + uuid_str);
// 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_filename);
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);
assert(num_specs <= 1 &&
"Symbol Vendor supports only a single architecture");
if (num_specs == 1) {
ModuleSpec mspec;
if (specs.GetModuleSpecAtIndex(0, 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 LocateExecutableSymbolFileDsym(module_spec);
}
#if !defined(__APPLE__)
FileSpec Symbols::FindSymbolFileInBundle(const FileSpec &symfile_bundle,
const lldb_private::UUID *uuid,
const ArchSpec *arch) {
// FIXME
return FileSpec();
}
bool Symbols::DownloadObjectAndSymbolFile(ModuleSpec &module_spec,
bool force_lookup) {
// Fill in the module_spec.GetFileSpec() for the object file and/or the
// module_spec.GetSymbolFileSpec() for the debug symbols file.
return false;
}
#endif
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