HistoryThread.cpp revision 360784 
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
22using namespace lldb;
23using namespace lldb_private;
24
25//  Constructor
26
27HistoryThread::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
40HistoryThread::~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
47lldb::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
56lldb::RegisterContextSP
57HistoryThread::CreateRegisterContextForFrame(StackFrame *frame) {
58  return m_unwinder_up->CreateRegisterContextForFrame(frame);
59}
60
61lldb::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
73uint32_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}
83