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//===-- 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
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