UnwindTable.h revision 276479 
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::FuncUnwindersSP
35    GetFuncUnwindersContainingAddress (const Address& addr, SymbolContext &sc);
36
37// Normally when we create a new FuncUnwinders object we track it in this UnwindTable so it can
38// be reused later.  But for the target modules show-unwind we want to create brand new
39// UnwindPlans for the function of interest - so ignore any existing FuncUnwinders for that
40// function and don't add this new one to our UnwindTable.
41// This FuncUnwinders object does have a reference to the UnwindTable but the lifetime of this
42// uncached FuncUnwinders is expected to be short so in practice this will not be a problem.
43    lldb::FuncUnwindersSP
44    GetUncachedFuncUnwindersContainingAddress (const Address& addr, SymbolContext &sc);
45
46    bool
47    GetArchitecture (lldb_private::ArchSpec &arch);
48
49private:
50    void
51    Dump (Stream &s);
52
53    void Initialize ();
54
55    typedef std::map<lldb::addr_t, lldb::FuncUnwindersSP> collection;
56    typedef collection::iterator iterator;
57    typedef collection::const_iterator const_iterator;
58
59    ObjectFile&         m_object_file;
60    collection          m_unwinds;
61
62    bool                m_initialized;  // delay some initialization until ObjectFile is set up
63    Mutex               m_mutex;
64
65    DWARFCallFrameInfo* m_eh_frame;
66
67    DISALLOW_COPY_AND_ASSIGN (UnwindTable);
68};
69
70} // namespace lldb_private
71
72#endif  // liblldb_UnwindTable_h
73