1 //===-- HistoryUnwind.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-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 bool pcs_are_call_addresses) 28 : Unwind(thread), m_pcs(pcs), 29 m_pcs_are_call_addresses(pcs_are_call_addresses) {} 30 31 // Destructor 32 33 HistoryUnwind::~HistoryUnwind() = default; 34 35 void HistoryUnwind::DoClear() { 36 std::lock_guard<std::recursive_mutex> guard(m_unwind_mutex); 37 m_pcs.clear(); 38 } 39 40 lldb::RegisterContextSP 41 HistoryUnwind::DoCreateRegisterContextForFrame(StackFrame *frame) { 42 RegisterContextSP rctx; 43 if (frame) { 44 addr_t pc = frame->GetFrameCodeAddress().GetLoadAddress( 45 &frame->GetThread()->GetProcess()->GetTarget()); 46 if (pc != LLDB_INVALID_ADDRESS) { 47 rctx = std::make_shared<RegisterContextHistory>( 48 *frame->GetThread().get(), frame->GetConcreteFrameIndex(), 49 frame->GetThread()->GetProcess()->GetAddressByteSize(), pc); 50 } 51 } 52 return rctx; 53 } 54 55 bool HistoryUnwind::DoGetFrameInfoAtIndex(uint32_t frame_idx, lldb::addr_t &cfa, 56 lldb::addr_t &pc, 57 bool &behaves_like_zeroth_frame) { 58 // FIXME do not throw away the lock after we acquire it.. 59 std::unique_lock<std::recursive_mutex> guard(m_unwind_mutex); 60 guard.unlock(); 61 if (frame_idx < m_pcs.size()) { 62 cfa = frame_idx; 63 pc = m_pcs[frame_idx]; 64 if (m_pcs_are_call_addresses) 65 behaves_like_zeroth_frame = true; 66 else 67 behaves_like_zeroth_frame = (frame_idx == 0); 68 return true; 69 } 70 return false; 71 } 72 73 uint32_t HistoryUnwind::DoGetFrameCount() { return m_pcs.size(); } 74