source/Plugins/Process/Utility/UnwindMacOSXFrameBackchain.h

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