lldb/source/Plugins/Process/Utility/HistoryThread.cpp

   1 //===-- HistoryThread.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/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/LLDBLog.h"
  19 #include "lldb/Utility/Log.h"
  20
  21 #include <memory>
  22
  23 using namespace lldb;
  24 using namespace lldb_private;
  25
  26 //  Constructor
  27
  28 HistoryThread::HistoryThread(lldb_private::Process &process, lldb::tid_t tid,
  29                              std::vector<lldb::addr_t> pcs,
  30                              bool pcs_are_call_addresses)
  31     : Thread(process, tid, true), m_framelist_mutex(), m_framelist(),
  32       m_pcs(pcs), m_extended_unwind_token(LLDB_INVALID_ADDRESS), m_queue_name(),
  33       m_thread_name(), m_originating_unique_thread_id(tid),
  34       m_queue_id(LLDB_INVALID_QUEUE_ID) {
  35   m_unwinder_up =
  36       std::make_unique<HistoryUnwind>(*this, pcs, pcs_are_call_addresses);
  37   Log *log = GetLog(LLDBLog::Object);
  38   LLDB_LOGF(log, "%p HistoryThread::HistoryThread", static_cast<void *>(this));
  39 }
  40
  41 //  Destructor
  42
  43 HistoryThread::~HistoryThread() {
  44   Log *log = GetLog(LLDBLog::Object);
  45   LLDB_LOGF(log, "%p HistoryThread::~HistoryThread (tid=0x%" PRIx64 ")",
  46             static_cast<void *>(this), GetID());
  47   DestroyThread();
  48 }
  49
  50 lldb::RegisterContextSP HistoryThread::GetRegisterContext() {
  51   RegisterContextSP rctx;
  52   if (m_pcs.size() > 0) {
  53     rctx = std::make_shared<RegisterContextHistory>(
  54         *this, 0, GetProcess()->GetAddressByteSize(), m_pcs[0]);
  55   }
  56   return rctx;
  57 }
  58
  59 lldb::RegisterContextSP
  60 HistoryThread::CreateRegisterContextForFrame(StackFrame *frame) {
  61   return m_unwinder_up->CreateRegisterContextForFrame(frame);
  62 }
  63
  64 lldb::StackFrameListSP HistoryThread::GetStackFrameList() {
  65   // FIXME do not throw away the lock after we acquire it..
  66   std::unique_lock<std::mutex> lock(m_framelist_mutex);
  67   lock.unlock();
  68   if (m_framelist.get() == nullptr) {
  69     m_framelist =
  70         std::make_shared<StackFrameList>(*this, StackFrameListSP(), true);
  71   }
  72
  73   return m_framelist;
  74 }
  75
  76 uint32_t HistoryThread::GetExtendedBacktraceOriginatingIndexID() {
  77   if (m_originating_unique_thread_id != LLDB_INVALID_THREAD_ID) {
  78     if (GetProcess()->HasAssignedIndexIDToThread(
  79             m_originating_unique_thread_id)) {
  80       return GetProcess()->AssignIndexIDToThread(
  81           m_originating_unique_thread_id);
  82     }
  83   }
  84   return LLDB_INVALID_THREAD_ID;
  85 }