contrib/llvm/tools/lldb/source/Plugins/Process/Utility/HistoryUnwind.cpp

   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/RegisterContextHistory.h"
  13 #include "Plugins/Process/Utility/HistoryUnwind.h"
  14
  15 #include "lldb/Target/StackFrame.h"
  16 #include "lldb/Target/Thread.h"
  17 #include "lldb/Target/Process.h"
  18 #include "lldb/Target/Target.h"
  19
  20 using namespace lldb;
  21 using namespace lldb_private;
  22
  23 HistoryUnwind::HistoryUnwind (Thread &thread,
  24                               std::vector<lldb::addr_t> pcs,
  25                               uint32_t stop_id,
  26                               bool stop_id_is_valid) :
  27         Unwind (thread),
  28         m_pcs (pcs),
  29         m_stop_id (stop_id),
  30         m_stop_id_is_valid (stop_id_is_valid)
  31 {
  32 }
  33
  34 HistoryUnwind::~HistoryUnwind ()
  35 {
  36 }
  37
  38 void
  39 HistoryUnwind::DoClear ()
  40 {
  41     Mutex::Locker locker(m_unwind_mutex);
  42     m_pcs.clear();
  43     m_stop_id_is_valid = false;
  44 }
  45
  46 lldb::RegisterContextSP
  47 HistoryUnwind::DoCreateRegisterContextForFrame (StackFrame *frame)
  48 {
  49     RegisterContextSP rctx;
  50     if (frame)
  51     {
  52         addr_t pc = frame->GetFrameCodeAddress().GetLoadAddress (&frame->GetThread()->GetProcess()->GetTarget());
  53         if (pc != LLDB_INVALID_ADDRESS)
  54         {
  55             rctx.reset (new RegisterContextHistory (*frame->GetThread().get(), frame->GetConcreteFrameIndex(),
  56                         frame->GetThread()->GetProcess()->GetAddressByteSize(), pc));
  57         }
  58     }
  59     return rctx;
  60 }
  61
  62 bool
  63 HistoryUnwind::DoGetFrameInfoAtIndex (uint32_t frame_idx, lldb::addr_t& cfa, lldb::addr_t& pc)
  64 {
  65     Mutex::Locker (m_unwind_mutex);
  66     if (frame_idx < m_pcs.size())
  67     {
  68         cfa = frame_idx;
  69         pc = m_pcs[frame_idx];
  70         return true;
  71     }
  72     return false;
  73 }
  74
  75 uint32_t
  76 HistoryUnwind::DoGetFrameCount ()
  77 {
  78     return m_pcs.size();
  79 }