UnwindTable.h revision 309124 
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
11#ifndef liblldb_UnwindTable_h
12#define liblldb_UnwindTable_h
13
14#include <map>
15#include <mutex>
16
17#include "lldb/lldb-private.h"
18
19namespace lldb_private {
20
21// A class which holds all the FuncUnwinders objects for a given ObjectFile.
22// The UnwindTable is populated with FuncUnwinders objects lazily during
23// the debug session.
24
25class UnwindTable
26{
27public:
28    UnwindTable(ObjectFile& objfile);
29    ~UnwindTable();
30
31    lldb_private::DWARFCallFrameInfo *
32    GetEHFrameInfo ();
33
34    lldb_private::CompactUnwindInfo *
35    GetCompactUnwindInfo ();
36
37    ArmUnwindInfo *
38    GetArmUnwindInfo ();
39
40    lldb::FuncUnwindersSP
41    GetFuncUnwindersContainingAddress (const Address& addr, SymbolContext &sc);
42
43    bool
44    GetAllowAssemblyEmulationUnwindPlans ();
45
46// Normally when we create a new FuncUnwinders object we track it in this UnwindTable so it can
47// be reused later.  But for the target modules show-unwind we want to create brand new
48// UnwindPlans for the function of interest - so ignore any existing FuncUnwinders for that
49// function and don't add this new one to our UnwindTable.
50// This FuncUnwinders object does have a reference to the UnwindTable but the lifetime of this
51// uncached FuncUnwinders is expected to be short so in practice this will not be a problem.
52    lldb::FuncUnwindersSP
53    GetUncachedFuncUnwindersContainingAddress (const Address& addr, SymbolContext &sc);
54
55    bool
56    GetArchitecture (lldb_private::ArchSpec &arch);
57
58private:
59    void
60    Dump (Stream &s);
61
62    void Initialize ();
63
64    typedef std::map<lldb::addr_t, lldb::FuncUnwindersSP> collection;
65    typedef collection::iterator iterator;
66    typedef collection::const_iterator const_iterator;
67
68    ObjectFile&         m_object_file;
69    collection          m_unwinds;
70
71    bool                m_initialized;  // delay some initialization until ObjectFile is set up
72    std::mutex m_mutex;
73
74    std::unique_ptr<DWARFCallFrameInfo> m_eh_frame_up;
75    std::unique_ptr<CompactUnwindInfo>  m_compact_unwind_up;
76    std::unique_ptr<ArmUnwindInfo>      m_arm_unwind_up;
77
78    DISALLOW_COPY_AND_ASSIGN (UnwindTable);
79};
80
81} // namespace lldb_private
82
83#endif  // liblldb_UnwindTable_h
84