1 //===-- ThreadMemory.cpp ----------------------------------------------*- C++
2 //-*-===//
3 //
4 //                     The LLVM Compiler Infrastructure
5 //
6 // This file is distributed under the University of Illinois Open Source
7 // License. See LICENSE.TXT for details.
8 //
9 //===----------------------------------------------------------------------===//
10 
11 #include "Plugins/Process/Utility/ThreadMemory.h"
12 #include "Plugins/Process/Utility/RegisterContextThreadMemory.h"
13 #include "lldb/Target/OperatingSystem.h"
14 #include "lldb/Target/Process.h"
15 #include "lldb/Target/RegisterContext.h"
16 #include "lldb/Target/StopInfo.h"
17 #include "lldb/Target/Unwind.h"
18 
19 using namespace lldb;
20 using namespace lldb_private;
21 
22 ThreadMemory::ThreadMemory(Process &process, tid_t tid,
23                            const ValueObjectSP &thread_info_valobj_sp)
24     : Thread(process, tid), m_backing_thread_sp(),
25       m_thread_info_valobj_sp(thread_info_valobj_sp), m_name(), m_queue() {}
26 
27 ThreadMemory::ThreadMemory(Process &process, lldb::tid_t tid,
28                            llvm::StringRef name, llvm::StringRef queue,
29                            lldb::addr_t register_data_addr)
30     : Thread(process, tid), m_backing_thread_sp(), m_thread_info_valobj_sp(),
31       m_name(name), m_queue(queue), m_register_data_addr(register_data_addr) {}
32 
33 ThreadMemory::~ThreadMemory() { DestroyThread(); }
34 
35 void ThreadMemory::WillResume(StateType resume_state) {
36   if (m_backing_thread_sp)
37     m_backing_thread_sp->WillResume(resume_state);
38 }
39 
40 void ThreadMemory::ClearStackFrames() {
41   if (m_backing_thread_sp)
42     m_backing_thread_sp->ClearStackFrames();
43   Thread::ClearStackFrames();
44 }
45 
46 RegisterContextSP ThreadMemory::GetRegisterContext() {
47   if (!m_reg_context_sp)
48     m_reg_context_sp.reset(
49         new RegisterContextThreadMemory(*this, m_register_data_addr));
50   return m_reg_context_sp;
51 }
52 
53 RegisterContextSP
54 ThreadMemory::CreateRegisterContextForFrame(StackFrame *frame) {
55   RegisterContextSP reg_ctx_sp;
56   uint32_t concrete_frame_idx = 0;
57 
58   if (frame)
59     concrete_frame_idx = frame->GetConcreteFrameIndex();
60 
61   if (concrete_frame_idx == 0) {
62     reg_ctx_sp = GetRegisterContext();
63   } else {
64     Unwind *unwinder = GetUnwinder();
65     if (unwinder != nullptr)
66       reg_ctx_sp = unwinder->CreateRegisterContextForFrame(frame);
67   }
68   return reg_ctx_sp;
69 }
70 
71 bool ThreadMemory::CalculateStopInfo() {
72   if (m_backing_thread_sp) {
73     lldb::StopInfoSP backing_stop_info_sp(
74         m_backing_thread_sp->GetPrivateStopInfo());
75     if (backing_stop_info_sp &&
76         backing_stop_info_sp->IsValidForOperatingSystemThread(*this)) {
77       backing_stop_info_sp->SetThread(shared_from_this());
78       SetStopInfo(backing_stop_info_sp);
79       return true;
80     }
81   } else {
82     ProcessSP process_sp(GetProcess());
83 
84     if (process_sp) {
85       OperatingSystem *os = process_sp->GetOperatingSystem();
86       if (os) {
87         SetStopInfo(os->CreateThreadStopReason(this));
88         return true;
89       }
90     }
91   }
92   return false;
93 }
94 
95 void ThreadMemory::RefreshStateAfterStop() {
96   if (m_backing_thread_sp)
97     return m_backing_thread_sp->RefreshStateAfterStop();
98 
99   if (m_reg_context_sp)
100     m_reg_context_sp->InvalidateAllRegisters();
101 }
102