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