1 //===-- HistoryUnwind.cpp ---------------------------------------*- C++ -*-===// 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-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "lldb/lldb-private.h" 10 11 #include "Plugins/Process/Utility/HistoryUnwind.h" 12 #include "Plugins/Process/Utility/RegisterContextHistory.h" 13 14 #include "lldb/Target/Process.h" 15 #include "lldb/Target/StackFrame.h" 16 #include "lldb/Target/Target.h" 17 #include "lldb/Target/Thread.h" 18 19 #include <memory> 20 21 using namespace lldb; 22 using namespace lldb_private; 23 24 // Constructor 25 26 HistoryUnwind::HistoryUnwind(Thread &thread, std::vector<lldb::addr_t> pcs) 27 : Unwind(thread), m_pcs(pcs) {} 28 29 // Destructor 30 31 HistoryUnwind::~HistoryUnwind() {} 32 33 void HistoryUnwind::DoClear() { 34 std::lock_guard<std::recursive_mutex> guard(m_unwind_mutex); 35 m_pcs.clear(); 36 } 37 38 lldb::RegisterContextSP 39 HistoryUnwind::DoCreateRegisterContextForFrame(StackFrame *frame) { 40 RegisterContextSP rctx; 41 if (frame) { 42 addr_t pc = frame->GetFrameCodeAddress().GetLoadAddress( 43 &frame->GetThread()->GetProcess()->GetTarget()); 44 if (pc != LLDB_INVALID_ADDRESS) { 45 rctx = std::make_shared<RegisterContextHistory>( 46 *frame->GetThread().get(), frame->GetConcreteFrameIndex(), 47 frame->GetThread()->GetProcess()->GetAddressByteSize(), pc); 48 } 49 } 50 return rctx; 51 } 52 53 bool HistoryUnwind::DoGetFrameInfoAtIndex(uint32_t frame_idx, lldb::addr_t &cfa, 54 lldb::addr_t &pc, 55 bool &behaves_like_zeroth_frame) { 56 // FIXME do not throw away the lock after we acquire it.. 57 std::unique_lock<std::recursive_mutex> guard(m_unwind_mutex); 58 guard.unlock(); 59 if (frame_idx < m_pcs.size()) { 60 cfa = frame_idx; 61 pc = m_pcs[frame_idx]; 62 behaves_like_zeroth_frame = (frame_idx == 0); 63 return true; 64 } 65 return false; 66 } 67 68 uint32_t HistoryUnwind::DoGetFrameCount() { return m_pcs.size(); } 69