1 //===-- UnwindMacOSXFrameBackchain.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 lldb_UnwindMacOSXFrameBackchain_h_
11 #define lldb_UnwindMacOSXFrameBackchain_h_
12 
13 // C Includes
14 // C++ Includes
15 #include <vector>
16 
17 // Other libraries and framework includes
18 
19 // Project includes
20 #include "lldb/lldb-private.h"
21 #include "lldb/Target/Unwind.h"
22 
23 class UnwindMacOSXFrameBackchain : public lldb_private::Unwind
24 {
25 public:
26     UnwindMacOSXFrameBackchain (lldb_private::Thread &thread);
27 
28     virtual
~UnwindMacOSXFrameBackchain()29     ~UnwindMacOSXFrameBackchain()
30     {
31     }
32 
33 protected:
34     virtual void
DoClear()35     DoClear()
36     {
37         m_cursors.clear();
38     }
39 
40     virtual uint32_t
41     DoGetFrameCount();
42 
43     bool
44     DoGetFrameInfoAtIndex (uint32_t frame_idx,
45                          lldb::addr_t& cfa,
46                          lldb::addr_t& pc);
47 
48     lldb::RegisterContextSP
49     DoCreateRegisterContextForFrame (lldb_private::StackFrame *frame);
50 
51     friend class RegisterContextMacOSXFrameBackchain;
52 
53     struct Cursor
54     {
55         lldb::addr_t pc;    // Program counter
56         lldb::addr_t fp;    // Frame pointer for us with backchain
57     };
58 
59 private:
60     std::vector<Cursor> m_cursors;
61 
62     size_t
63     GetStackFrameData_i386 (const lldb_private::ExecutionContext &exe_ctx);
64 
65     size_t
66     GetStackFrameData_x86_64 (const lldb_private::ExecutionContext &exe_ctx);
67 
68     //------------------------------------------------------------------
69     // For UnwindMacOSXFrameBackchain only
70     //------------------------------------------------------------------
71     DISALLOW_COPY_AND_ASSIGN (UnwindMacOSXFrameBackchain);
72 };
73 
74 #endif  // lldb_UnwindMacOSXFrameBackchain_h_
75