47 lines · cpp
1//===-- Utility.cpp -------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#include "Utility.h"10 11#include "lldb/Core/Module.h"12#include "lldb/Target/Target.h"13 14namespace lldb_private {15 16std::tuple<lldb::ModuleSP, HistoryPCType>17GetPreferredAsanModule(const Target &target) {18 // Currently only Darwin provides ASan runtime support as part of the OS19 // (libsanitizers).20 if (!target.GetArchitecture().GetTriple().isOSDarwin())21 return {nullptr, HistoryPCType::Calls};22 23 lldb::ModuleSP module;24 llvm::Regex pattern(R"(libclang_rt\.asan_.*_dynamic\.dylib)");25 target.GetImages().ForEach([&](const lldb::ModuleSP &m) {26 if (pattern.match(m->GetFileSpec().GetFilename().GetStringRef())) {27 module = m;28 return IterationAction::Stop;29 }30 31 return IterationAction::Continue;32 });33 34 // `Calls` - The ASan compiler-rt runtime already massages the return35 // addresses into call addresses, so we don't want LLDB's unwinder to try to36 // locate the previous instruction again as this might lead to us reporting37 // a different line.38 // `ReturnsNoZerothFrame` - Darwin, but not ASan compiler-rt implies39 // libsanitizers which collects return addresses. It also discards a few40 // non-user frames at the top of the stack.41 auto pc_type =42 (module ? HistoryPCType::Calls : HistoryPCType::ReturnsNoZerothFrame);43 return {module, pc_type};44}45 46} // namespace lldb_private47