| //===-- HistoryUnwind.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 "lldb/lldb-private.h" |
| |
| #include "Plugins/Process/Utility/HistoryUnwind.h" |
| #include "Plugins/Process/Utility/RegisterContextHistory.h" |
| |
| #include "lldb/Target/Process.h" |
| #include "lldb/Target/StackFrame.h" |
| #include "lldb/Target/Target.h" |
| #include "lldb/Target/Thread.h" |
| |
| #include <memory> |
| |
| using namespace lldb; |
| using namespace lldb_private; |
| |
| // Constructor |
| |
| HistoryUnwind::HistoryUnwind(Thread &thread, std::vector<lldb::addr_t> pcs, |
| bool pcs_are_call_addresses) |
| : Unwind(thread), m_pcs(pcs), |
| m_pcs_are_call_addresses(pcs_are_call_addresses) {} |
| |
| // Destructor |
| |
| HistoryUnwind::~HistoryUnwind() = default; |
| |
| void HistoryUnwind::DoClear() { |
| std::lock_guard<std::recursive_mutex> guard(m_unwind_mutex); |
| m_pcs.clear(); |
| } |
| |
| lldb::RegisterContextSP |
| HistoryUnwind::DoCreateRegisterContextForFrame(StackFrame *frame) { |
| RegisterContextSP rctx; |
| if (frame) { |
| addr_t pc = frame->GetFrameCodeAddress().GetLoadAddress( |
| &frame->GetThread()->GetProcess()->GetTarget()); |
| if (pc != LLDB_INVALID_ADDRESS) { |
| rctx = std::make_shared<RegisterContextHistory>( |
| *frame->GetThread().get(), frame->GetConcreteFrameIndex(), |
| frame->GetThread()->GetProcess()->GetAddressByteSize(), pc); |
| } |
| } |
| return rctx; |
| } |
| |
| bool HistoryUnwind::DoGetFrameInfoAtIndex(uint32_t frame_idx, lldb::addr_t &cfa, |
| lldb::addr_t &pc, |
| bool &behaves_like_zeroth_frame) { |
| // FIXME do not throw away the lock after we acquire it.. |
| std::unique_lock<std::recursive_mutex> guard(m_unwind_mutex); |
| guard.unlock(); |
| if (frame_idx < m_pcs.size()) { |
| cfa = frame_idx; |
| pc = m_pcs[frame_idx]; |
| if (m_pcs_are_call_addresses) |
| behaves_like_zeroth_frame = true; |
| else |
| behaves_like_zeroth_frame = (frame_idx == 0); |
| return true; |
| } |
| return false; |
| } |
| |
| uint32_t HistoryUnwind::DoGetFrameCount() { return m_pcs.size(); } |