UnwindTable.h revision 344779 
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 the
22// 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 be reused later.  But for the target modules show-
43  // unwind we want to create brand new UnwindPlans for the function of
44  // interest - so ignore any existing FuncUnwinders for that function and
45  // don't add this new one to our UnwindTable. This FuncUnwinders object does
46  // have a reference to the UnwindTable but the lifetime of this uncached
47  // FuncUnwinders is expected to be short so in practice this will not be a
48  // problem.
49  lldb::FuncUnwindersSP
50  GetUncachedFuncUnwindersContainingAddress(const Address &addr,
51                                            SymbolContext &sc);
52
53  ArchSpec GetArchitecture();
54
55private:
56  void Dump(Stream &s);
57
58  void Initialize();
59  llvm::Optional<AddressRange> GetAddressRange(const Address &addr,
60                                               SymbolContext &sc);
61
62  typedef std::map<lldb::addr_t, lldb::FuncUnwindersSP> collection;
63  typedef collection::iterator iterator;
64  typedef collection::const_iterator const_iterator;
65
66  ObjectFile &m_object_file;
67  collection m_unwinds;
68
69  bool m_initialized; // delay some initialization until ObjectFile is set up
70  std::mutex m_mutex;
71
72  std::unique_ptr<DWARFCallFrameInfo> m_eh_frame_up;
73  std::unique_ptr<DWARFCallFrameInfo> m_debug_frame_up;
74  std::unique_ptr<CompactUnwindInfo> m_compact_unwind_up;
75  std::unique_ptr<ArmUnwindInfo> m_arm_unwind_up;
76
77  DISALLOW_COPY_AND_ASSIGN(UnwindTable);
78};
79
80} // namespace lldb_private
81
82#endif // liblldb_UnwindTable_h
83