| //===-- Utility.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 "Utility.h" |
| |
| #include "lldb/Core/Module.h" |
| #include "lldb/Target/Target.h" |
| |
| namespace lldb_private { |
| |
| std::tuple<lldb::ModuleSP, HistoryPCType> |
| GetPreferredAsanModule(const Target &target) { |
| // Currently only Darwin provides ASan runtime support as part of the OS |
| // (libsanitizers). |
| if (!target.GetArchitecture().GetTriple().isOSDarwin()) |
| return {nullptr, HistoryPCType::Calls}; |
| |
| lldb::ModuleSP module; |
| llvm::Regex pattern(R"(libclang_rt\.asan_.*_dynamic\.dylib)"); |
| target.GetImages().ForEach([&](const lldb::ModuleSP &m) { |
| if (pattern.match(m->GetFileSpec().GetFilename().GetStringRef())) { |
| module = m; |
| return IterationAction::Stop; |
| } |
| |
| return IterationAction::Continue; |
| }); |
| |
| // `Calls` - The ASan compiler-rt runtime already massages the return |
| // addresses into call addresses, so we don't want LLDB's unwinder to try to |
| // locate the previous instruction again as this might lead to us reporting |
| // a different line. |
| // `ReturnsNoZerothFrame` - Darwin, but not ASan compiler-rt implies |
| // libsanitizers which collects return addresses. It also discards a few |
| // non-user frames at the top of the stack. |
| auto pc_type = |
| (module ? HistoryPCType::Calls : HistoryPCType::ReturnsNoZerothFrame); |
| return {module, pc_type}; |
| } |
| |
| } // namespace lldb_private |
