UnwindTable.h revision 296417 
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
16#include "lldb/lldb-private.h"
17#include "lldb/Host/Mutex.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// Normally when we create a new FuncUnwinders object we track it in this UnwindTable so it can
44// be reused later.  But for the target modules show-unwind we want to create brand new
45// UnwindPlans for the function of interest - so ignore any existing FuncUnwinders for that
46// function and don't add this new one to our UnwindTable.
47// This FuncUnwinders object does have a reference to the UnwindTable but the lifetime of this
48// uncached FuncUnwinders is expected to be short so in practice this will not be a problem.
49    lldb::FuncUnwindersSP
50    GetUncachedFuncUnwindersContainingAddress (const Address& addr, SymbolContext &sc);
51
52    bool
53    GetArchitecture (lldb_private::ArchSpec &arch);
54
55private:
56    void
57    Dump (Stream &s);
58
59    void Initialize ();
60
61    typedef std::map<lldb::addr_t, lldb::FuncUnwindersSP> collection;
62    typedef collection::iterator iterator;
63    typedef collection::const_iterator const_iterator;
64
65    ObjectFile&         m_object_file;
66    collection          m_unwinds;
67
68    bool                m_initialized;  // delay some initialization until ObjectFile is set up
69    Mutex               m_mutex;
70
71    std::unique_ptr<DWARFCallFrameInfo> m_eh_frame_up;
72    std::unique_ptr<CompactUnwindInfo>  m_compact_unwind_up;
73    std::unique_ptr<ArmUnwindInfo>      m_arm_unwind_up;
74
75    DISALLOW_COPY_AND_ASSIGN (UnwindTable);
76};
77
78} // namespace lldb_private
79
80#endif  // liblldb_UnwindTable_h
81