UnwindTable.h revision 321369 
1//===-- Symtab.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_UnwindTable_h
11#define liblldb_UnwindTable_h
12
13#include <map>
14#include <mutex>
15
16#include "lldb/lldb-private.h"
17
18namespace lldb_private {
19
20// A class which holds all the FuncUnwinders objects for a given ObjectFile.
21// The UnwindTable is populated with FuncUnwinders objects lazily during
22// the debug session.
23
24class UnwindTable {
25public:
26  UnwindTable(ObjectFile &objfile);
27  ~UnwindTable();
28
29  lldb_private::DWARFCallFrameInfo *GetEHFrameInfo();
30  lldb_private::DWARFCallFrameInfo *GetDebugFrameInfo();
31
32  lldb_private::CompactUnwindInfo *GetCompactUnwindInfo();
33
34  ArmUnwindInfo *GetArmUnwindInfo();
35
36  lldb::FuncUnwindersSP GetFuncUnwindersContainingAddress(const Address &addr,
37                                                          SymbolContext &sc);
38
39  bool GetAllowAssemblyEmulationUnwindPlans();
40
41  // Normally when we create a new FuncUnwinders object we track it in this
42  // UnwindTable so it can
43  // be reused later.  But for the target modules show-unwind we want to create
44  // brand new
45  // UnwindPlans for the function of interest - so ignore any existing
46  // FuncUnwinders for that
47  // function and don't add this new one to our UnwindTable.
48  // This FuncUnwinders object does have a reference to the UnwindTable but the
49  // lifetime of this
50  // uncached FuncUnwinders is expected to be short so in practice this will not
51  // be a problem.
52  lldb::FuncUnwindersSP
53  GetUncachedFuncUnwindersContainingAddress(const Address &addr,
54                                            SymbolContext &sc);
55
56  bool GetArchitecture(lldb_private::ArchSpec &arch);
57
58private:
59  void Dump(Stream &s);
60
61  void Initialize();
62  llvm::Optional<AddressRange> GetAddressRange(const Address &addr,
63                                               SymbolContext &sc);
64
65  typedef std::map<lldb::addr_t, lldb::FuncUnwindersSP> collection;
66  typedef collection::iterator iterator;
67  typedef collection::const_iterator const_iterator;
68
69  ObjectFile &m_object_file;
70  collection m_unwinds;
71
72  bool m_initialized; // delay some initialization until ObjectFile is set up
73  std::mutex m_mutex;
74
75  std::unique_ptr<DWARFCallFrameInfo> m_eh_frame_up;
76  std::unique_ptr<DWARFCallFrameInfo> m_debug_frame_up;
77  std::unique_ptr<CompactUnwindInfo> m_compact_unwind_up;
78  std::unique_ptr<ArmUnwindInfo> m_arm_unwind_up;
79
80  DISALLOW_COPY_AND_ASSIGN(UnwindTable);
81};
82
83} // namespace lldb_private
84
85#endif // liblldb_UnwindTable_h
86