contrib/llvm-project/lldb/source/Plugins/Process/Utility/UnwindMacOSXFrameBackchain.h

   1 //===-- UnwindMacOSXFrameBackchain.h ----------------------------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #ifndef lldb_UnwindMacOSXFrameBackchain_h_
  10 #define lldb_UnwindMacOSXFrameBackchain_h_
  11
  12 #include <vector>
  13
  14 #include "lldb/Target/Unwind.h"
  15 #include "lldb/lldb-private.h"
  16
  17 class UnwindMacOSXFrameBackchain : public lldb_private::Unwind {
  18 public:
  19   UnwindMacOSXFrameBackchain(lldb_private::Thread &thread);
  20
  21   ~UnwindMacOSXFrameBackchain() override = default;
  22
  23 protected:
  24   void DoClear() override { m_cursors.clear(); }
  25
  26   uint32_t DoGetFrameCount() override;
  27
  28   bool DoGetFrameInfoAtIndex(uint32_t frame_idx, lldb::addr_t &cfa,
  29                              lldb::addr_t &pc,
  30                              bool &behaves_like_zeroth_frame) override;
  31
  32   lldb::RegisterContextSP
  33   DoCreateRegisterContextForFrame(lldb_private::StackFrame *frame) override;
  34
  35   friend class RegisterContextMacOSXFrameBackchain;
  36
  37   struct Cursor {
  38     lldb::addr_t pc; // Program counter
  39     lldb::addr_t fp; // Frame pointer for us with backchain
  40   };
  41
  42 private:
  43   std::vector<Cursor> m_cursors;
  44
  45   size_t GetStackFrameData_i386(const lldb_private::ExecutionContext &exe_ctx);
  46
  47   size_t
  48   GetStackFrameData_x86_64(const lldb_private::ExecutionContext &exe_ctx);
  49
  50   // For UnwindMacOSXFrameBackchain only
  51   DISALLOW_COPY_AND_ASSIGN(UnwindMacOSXFrameBackchain);
  52 };
  53
  54 #endif // lldb_UnwindMacOSXFrameBackchain_h_