Unwind.h revision bf97d74c0c3e9a0f7c89fe0cd4a059015ec482d5 
1//===-- Unwind.h ------------------------------------------------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10#ifndef liblldb_Unwind_h_
11#define liblldb_Unwind_h_
12
13// C Includes
14// C++ Includes
15// Other libraries and framework includes
16// Project includes
17#include "lldb/lldb-private.h"
18#include "lldb/Host/Mutex.h"
19
20namespace lldb_private {
21
22class Unwind
23{
24protected:
25    //------------------------------------------------------------------
26    // Classes that inherit from Unwind can see and modify these
27    //------------------------------------------------------------------
28    Unwind(Thread &thread) :
29        m_thread (thread),
30        m_unwind_mutex()
31    {
32    }
33
34public:
35    virtual
36    ~Unwind()
37    {
38    }
39
40    void
41    Clear()
42    {
43        Mutex::Locker locker(m_unwind_mutex);
44        DoClear();
45
46    }
47
48    uint32_t
49    GetFrameCount()
50    {
51        Mutex::Locker locker(m_unwind_mutex);
52        return DoGetFrameCount();
53    }
54
55    uint32_t
56    GetFramesUpTo (uint32_t end_idx)
57    {
58        lldb::addr_t cfa;
59        lldb::addr_t pc;
60        uint32_t idx;
61
62        for (idx = 0; idx < end_idx; idx++)
63        {
64            if (!DoGetFrameInfoAtIndex (idx, cfa, pc))
65            {
66                break;
67            }
68        }
69        return idx;
70    }
71
72    bool
73    GetFrameInfoAtIndex (uint32_t frame_idx,
74                         lldb::addr_t& cfa,
75                         lldb::addr_t& pc)
76    {
77        Mutex::Locker locker(m_unwind_mutex);
78        return DoGetFrameInfoAtIndex (frame_idx, cfa, pc);
79    }
80
81    lldb::RegisterContextSP
82    CreateRegisterContextForFrame (StackFrame *frame)
83    {
84        Mutex::Locker locker(m_unwind_mutex);
85        return DoCreateRegisterContextForFrame (frame);
86    }
87
88    Thread &
89    GetThread()
90    {
91        return m_thread;
92    }
93
94protected:
95    //------------------------------------------------------------------
96    // Classes that inherit from Unwind can see and modify these
97    //------------------------------------------------------------------
98    virtual void
99    DoClear() = 0;
100
101    virtual uint32_t
102    DoGetFrameCount() = 0;
103
104    virtual bool
105    DoGetFrameInfoAtIndex (uint32_t frame_idx,
106                         lldb::addr_t& cfa,
107                         lldb::addr_t& pc) = 0;
108
109    virtual lldb::RegisterContextSP
110    DoCreateRegisterContextForFrame (StackFrame *frame) = 0;
111
112    Thread &m_thread;
113    Mutex  m_unwind_mutex;
114private:
115    DISALLOW_COPY_AND_ASSIGN (Unwind);
116};
117
118} // namespace lldb_private
119
120#endif  // liblldb_Unwind_h_
121