1 //===-- HistoryUnwind.cpp ---------------------------------------*- C++ -*-===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9
10 #include "lldb/lldb-private.h"
11
12 #include "Plugins/Process/Utility/HistoryUnwind.h"
13 #include "Plugins/Process/Utility/RegisterContextHistory.h"
14
15 #include "lldb/Target/Process.h"
16 #include "lldb/Target/StackFrame.h"
17 #include "lldb/Target/Target.h"
18 #include "lldb/Target/Thread.h"
19
20 using namespace lldb;
21 using namespace lldb_private;
22
23 // Constructor
24
HistoryUnwind(Thread & thread,std::vector<lldb::addr_t> pcs,bool stop_id_is_valid)25 HistoryUnwind::HistoryUnwind(Thread &thread, std::vector<lldb::addr_t> pcs,
26 bool stop_id_is_valid)
27 : Unwind(thread), m_pcs(pcs), m_stop_id_is_valid(stop_id_is_valid) {}
28
29 // Destructor
30
~HistoryUnwind()31 HistoryUnwind::~HistoryUnwind() {}
32
DoClear()33 void HistoryUnwind::DoClear() {
34 std::lock_guard<std::recursive_mutex> guard(m_unwind_mutex);
35 m_pcs.clear();
36 m_stop_id_is_valid = false;
37 }
38
39 lldb::RegisterContextSP
DoCreateRegisterContextForFrame(StackFrame * frame)40 HistoryUnwind::DoCreateRegisterContextForFrame(StackFrame *frame) {
41 RegisterContextSP rctx;
42 if (frame) {
43 addr_t pc = frame->GetFrameCodeAddress().GetLoadAddress(
44 &frame->GetThread()->GetProcess()->GetTarget());
45 if (pc != LLDB_INVALID_ADDRESS) {
46 rctx.reset(new RegisterContextHistory(
47 *frame->GetThread().get(), frame->GetConcreteFrameIndex(),
48 frame->GetThread()->GetProcess()->GetAddressByteSize(), pc));
49 }
50 }
51 return rctx;
52 }
53
DoGetFrameInfoAtIndex(uint32_t frame_idx,lldb::addr_t & cfa,lldb::addr_t & pc)54 bool HistoryUnwind::DoGetFrameInfoAtIndex(uint32_t frame_idx, lldb::addr_t &cfa,
55 lldb::addr_t &pc) {
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 return true;
63 }
64 return false;
65 }
66
DoGetFrameCount()67 uint32_t HistoryUnwind::DoGetFrameCount() { return m_pcs.size(); }
68