e61d89efd7
This creates a library for fetching debug info by build ID, whether locally or remotely via debuginfod. The functionality was refactored out of existing code in the Symboliize library. Existing utilities were refactored to use this library. Reviewed By: phosek Differential Revision: https://reviews.llvm.org/D132504
94 lines
2.8 KiB
C++
94 lines
2.8 KiB
C++
//===- llvm/Object/BuildID.cpp - Build ID ---------------------------------===//
|
|
//
|
|
// 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
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
///
|
|
/// \file
|
|
/// This file defines a library for handling Build IDs and using them to find
|
|
/// debug info.
|
|
///
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/Object/BuildID.h"
|
|
|
|
#include "llvm/Object/ELFObjectFile.h"
|
|
#include "llvm/Support/FileSystem.h"
|
|
#include "llvm/Support/Path.h"
|
|
|
|
namespace llvm {
|
|
namespace object {
|
|
|
|
namespace {
|
|
|
|
template <typename ELFT>
|
|
Optional<BuildIDRef> getBuildID(const ELFFile<ELFT> &Obj) {
|
|
auto PhdrsOrErr = Obj.program_headers();
|
|
if (!PhdrsOrErr) {
|
|
consumeError(PhdrsOrErr.takeError());
|
|
return {};
|
|
}
|
|
for (const auto &P : *PhdrsOrErr) {
|
|
if (P.p_type != ELF::PT_NOTE)
|
|
continue;
|
|
Error Err = Error::success();
|
|
for (auto N : Obj.notes(P, Err))
|
|
if (N.getType() == ELF::NT_GNU_BUILD_ID &&
|
|
N.getName() == ELF::ELF_NOTE_GNU)
|
|
return N.getDesc();
|
|
consumeError(std::move(Err));
|
|
}
|
|
return {};
|
|
}
|
|
|
|
} // namespace
|
|
|
|
Optional<BuildIDRef> getBuildID(const ObjectFile *Obj) {
|
|
if (auto *O = dyn_cast<ELFObjectFile<ELF32LE>>(Obj))
|
|
return getBuildID(O->getELFFile());
|
|
if (auto *O = dyn_cast<ELFObjectFile<ELF32BE>>(Obj))
|
|
return getBuildID(O->getELFFile());
|
|
if (auto *O = dyn_cast<ELFObjectFile<ELF64LE>>(Obj))
|
|
return getBuildID(O->getELFFile());
|
|
if (auto *O = dyn_cast<ELFObjectFile<ELF64BE>>(Obj))
|
|
return getBuildID(O->getELFFile());
|
|
return None;
|
|
}
|
|
|
|
Optional<std::string> BuildIDFetcher::fetch(BuildIDRef BuildID) const {
|
|
auto GetDebugPath = [&](StringRef Directory) {
|
|
SmallString<128> Path{Directory};
|
|
sys::path::append(Path, ".build-id",
|
|
llvm::toHex(BuildID[0], /*LowerCase=*/true),
|
|
llvm::toHex(BuildID.slice(1), /*LowerCase=*/true));
|
|
Path += ".debug";
|
|
return Path;
|
|
};
|
|
if (DebugFileDirectories.empty()) {
|
|
SmallString<128> Path = GetDebugPath(
|
|
#if defined(__NetBSD__)
|
|
// Try /usr/libdata/debug/.build-id/../...
|
|
"/usr/libdata/debug"
|
|
#else
|
|
// Try /usr/lib/debug/.build-id/../...
|
|
"/usr/lib/debug"
|
|
#endif
|
|
);
|
|
if (llvm::sys::fs::exists(Path))
|
|
return std::string(Path);
|
|
} else {
|
|
for (const auto &Directory : DebugFileDirectories) {
|
|
// Try <debug-file-directory>/.build-id/../...
|
|
SmallString<128> Path = GetDebugPath(Directory);
|
|
if (llvm::sys::fs::exists(Path))
|
|
return std::string(Path);
|
|
}
|
|
}
|
|
return None;
|
|
}
|
|
|
|
} // namespace object
|
|
} // namespace llvm
|