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 // Project includes
19 #include "lldb/Target/Unwind.h"
20 #include "lldb/lldb-private.h"
21 
22 class UnwindMacOSXFrameBackchain : public lldb_private::Unwind {
23 public:
24   UnwindMacOSXFrameBackchain(lldb_private::Thread &thread);
25 
26   ~UnwindMacOSXFrameBackchain() override = default;
27 
28 protected:
29   void DoClear() override { m_cursors.clear(); }
30 
31   uint32_t DoGetFrameCount() override;
32 
33   bool DoGetFrameInfoAtIndex(uint32_t frame_idx, lldb::addr_t &cfa,
34                              lldb::addr_t &pc) override;
35 
36   lldb::RegisterContextSP
37   DoCreateRegisterContextForFrame(lldb_private::StackFrame *frame) override;
38 
39   friend class RegisterContextMacOSXFrameBackchain;
40 
41   struct Cursor {
42     lldb::addr_t pc; // Program counter
43     lldb::addr_t fp; // Frame pointer for us with backchain
44   };
45 
46 private:
47   std::vector<Cursor> m_cursors;
48 
49   size_t GetStackFrameData_i386(const lldb_private::ExecutionContext &exe_ctx);
50 
51   size_t
52   GetStackFrameData_x86_64(const lldb_private::ExecutionContext &exe_ctx);
53 
54   //------------------------------------------------------------------
55   // For UnwindMacOSXFrameBackchain only
56   //------------------------------------------------------------------
57   DISALLOW_COPY_AND_ASSIGN(UnwindMacOSXFrameBackchain);
58 };
59 
60 #endif // lldb_UnwindMacOSXFrameBackchain_h_
61