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 #include "Plugins/Process/Utility/HistoryUnwind.h"
13 #include "Plugins/Process/Utility/RegisterContextHistory.h"
14 
15 #include "lldb/Target/Process.h"
16 #include "lldb/Target/StackFrameList.h"
17 #include "lldb/Utility/Log.h"
18 
19 using namespace lldb;
20 using namespace lldb_private;
21 
22 //  Constructor
23 
24 HistoryThread::HistoryThread(lldb_private::Process &process, lldb::tid_t tid,
25                              std::vector<lldb::addr_t> pcs, uint32_t stop_id,
26                              bool stop_id_is_valid)
27     : Thread(process, tid, true), m_framelist_mutex(), m_framelist(),
28       m_pcs(pcs), m_stop_id(stop_id), m_stop_id_is_valid(stop_id_is_valid),
29       m_extended_unwind_token(LLDB_INVALID_ADDRESS), m_queue_name(),
30       m_thread_name(), m_originating_unique_thread_id(tid),
31       m_queue_id(LLDB_INVALID_QUEUE_ID) {
32   m_unwinder_ap.reset(new HistoryUnwind(*this, pcs, stop_id_is_valid));
33   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_OBJECT));
34   if (log)
35     log->Printf("%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   if (log)
43     log->Printf("%p HistoryThread::~HistoryThread (tid=0x%" PRIx64 ")",
44                 static_cast<void *>(this), GetID());
45   DestroyThread();
46 }
47 
48 lldb::RegisterContextSP HistoryThread::GetRegisterContext() {
49   RegisterContextSP rctx;
50   if (m_pcs.size() > 0) {
51     rctx.reset(new RegisterContextHistory(
52         *this, 0, GetProcess()->GetAddressByteSize(), m_pcs[0]));
53   }
54   return rctx;
55 }
56 
57 lldb::RegisterContextSP
58 HistoryThread::CreateRegisterContextForFrame(StackFrame *frame) {
59   return m_unwinder_ap->CreateRegisterContextForFrame(frame);
60 }
61 
62 lldb::StackFrameListSP HistoryThread::GetStackFrameList() {
63   // FIXME do not throw away the lock after we acquire it..
64   std::unique_lock<std::mutex> lock(m_framelist_mutex);
65   lock.unlock();
66   if (m_framelist.get() == NULL) {
67     m_framelist.reset(new 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 }
83