contrib/llvm-project/lldb/source/Plugins/Process/Utility/HistoryThread.cpp

   1 //===-- HistoryThread.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/HistoryThread.h"
  12
  13 #include "Plugins/Process/Utility/HistoryUnwind.h"
  14 #include "Plugins/Process/Utility/RegisterContextHistory.h"
  15
  16 #include "lldb/Target/Process.h"
  17 #include "lldb/Target/StackFrameList.h"
  18 #include "lldb/Utility/Log.h"
  19
  20 #include <memory>
  21
  22 using namespace lldb;
  23 using namespace lldb_private;
  24
  25 //  Constructor
  26
  27 HistoryThread::HistoryThread(lldb_private::Process &process, lldb::tid_t tid,
  28                              std::vector<lldb::addr_t> pcs)
  29     : Thread(process, tid, true), m_framelist_mutex(), m_framelist(),
  30       m_pcs(pcs), m_extended_unwind_token(LLDB_INVALID_ADDRESS), m_queue_name(),
  31       m_thread_name(), m_originating_unique_thread_id(tid),
  32       m_queue_id(LLDB_INVALID_QUEUE_ID) {
  33   m_unwinder_up.reset(new HistoryUnwind(*this, pcs));
  34   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_OBJECT));
  35   LLDB_LOGF(log, "%p HistoryThread::HistoryThread", static_cast<void *>(this));
  36 }
  37
  38 //  Destructor
  39
  40 HistoryThread::~HistoryThread() {
  41   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_OBJECT));
  42   LLDB_LOGF(log, "%p HistoryThread::~HistoryThread (tid=0x%" PRIx64 ")",
  43             static_cast<void *>(this), GetID());
  44   DestroyThread();
  45 }
  46
  47 lldb::RegisterContextSP HistoryThread::GetRegisterContext() {
  48   RegisterContextSP rctx;
  49   if (m_pcs.size() > 0) {
  50     rctx = std::make_shared<RegisterContextHistory>(
  51         *this, 0, GetProcess()->GetAddressByteSize(), m_pcs[0]);
  52   }
  53   return rctx;
  54 }
  55
  56 lldb::RegisterContextSP
  57 HistoryThread::CreateRegisterContextForFrame(StackFrame *frame) {
  58   return m_unwinder_up->CreateRegisterContextForFrame(frame);
  59 }
  60
  61 lldb::StackFrameListSP HistoryThread::GetStackFrameList() {
  62   // FIXME do not throw away the lock after we acquire it..
  63   std::unique_lock<std::mutex> lock(m_framelist_mutex);
  64   lock.unlock();
  65   if (m_framelist.get() == nullptr) {
  66     m_framelist =
  67         std::make_shared<StackFrameList>(*this, StackFrameListSP(), true);
  68   }
  69
  70   return m_framelist;
  71 }
  72
  73 uint32_t HistoryThread::GetExtendedBacktraceOriginatingIndexID() {
  74   if (m_originating_unique_thread_id != LLDB_INVALID_THREAD_ID) {
  75     if (GetProcess()->HasAssignedIndexIDToThread(
  76             m_originating_unique_thread_id)) {
  77       return GetProcess()->AssignIndexIDToThread(
  78           m_originating_unique_thread_id);
  79     }
  80   }
  81   return LLDB_INVALID_THREAD_ID;
  82 }