UnwindTable.h revision 280031 
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    lldb::FuncUnwindersSP
38    GetFuncUnwindersContainingAddress (const Address& addr, SymbolContext &sc);
39
40// Normally when we create a new FuncUnwinders object we track it in this UnwindTable so it can
41// be reused later.  But for the target modules show-unwind we want to create brand new
42// UnwindPlans for the function of interest - so ignore any existing FuncUnwinders for that
43// function and don't add this new one to our UnwindTable.
44// This FuncUnwinders object does have a reference to the UnwindTable but the lifetime of this
45// uncached FuncUnwinders is expected to be short so in practice this will not be a problem.
46    lldb::FuncUnwindersSP
47    GetUncachedFuncUnwindersContainingAddress (const Address& addr, SymbolContext &sc);
48
49    bool
50    GetArchitecture (lldb_private::ArchSpec &arch);
51
52private:
53    void
54    Dump (Stream &s);
55
56    void Initialize ();
57
58    typedef std::map<lldb::addr_t, lldb::FuncUnwindersSP> collection;
59    typedef collection::iterator iterator;
60    typedef collection::const_iterator const_iterator;
61
62    ObjectFile&         m_object_file;
63    collection          m_unwinds;
64
65    bool                m_initialized;  // delay some initialization until ObjectFile is set up
66    Mutex               m_mutex;
67
68    DWARFCallFrameInfo* m_eh_frame;
69    CompactUnwindInfo  *m_compact_unwind;
70
71    DISALLOW_COPY_AND_ASSIGN (UnwindTable);
72};
73
74} // namespace lldb_private
75
76#endif  // liblldb_UnwindTable_h
77