1 //===-- DIERef.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 SymbolFileDWARF_DIERef_h_
11 #define SymbolFileDWARF_DIERef_h_
12 
13 #include "lldb/Core/dwarf.h"
14 #include "lldb/lldb-defines.h"
15 
16 class DWARFFormValue;
17 class SymbolFileDWARF;
18 
19 struct DIERef {
20   DIERef() = default;
21 
DIERefDIERef22   DIERef(dw_offset_t c, dw_offset_t d) : cu_offset(c), die_offset(d) {}
23 
24   //----------------------------------------------------------------------
25   // In order to properly decode a lldb::user_id_t back into a DIERef we
26   // need the DWARF file since it knows if DWARF in .o files is being used
27   // (MacOSX) or if DWO files are being used. The encoding of the user ID
28   // differs between the two types of DWARF.
29   //----------------------------------------------------------------------
30   explicit DIERef(lldb::user_id_t uid, SymbolFileDWARF *dwarf);
31 
32   explicit DIERef(const DWARFFormValue &form_value);
33 
34   //----------------------------------------------------------------------
35   // In order to properly encode a DIERef unto a lldb::user_id_t we need
36   // the DWARF file since it knows if DWARF in .o files is being used
37   // (MacOSX) or if DWO files are being used. The encoding of the user ID
38   // differs between the two types of DWARF.
39   //----------------------------------------------------------------------
40   lldb::user_id_t GetUID(SymbolFileDWARF *dwarf) const;
41 
42   bool operator<(const DIERef &ref) const {
43     return die_offset < ref.die_offset;
44   }
45 
46   bool operator<(const DIERef &ref) { return die_offset < ref.die_offset; }
47 
48   explicit operator bool() const {
49     return cu_offset != DW_INVALID_OFFSET || die_offset != DW_INVALID_OFFSET;
50   }
51 
52   dw_offset_t cu_offset = DW_INVALID_OFFSET;
53   dw_offset_t die_offset = DW_INVALID_OFFSET;
54 };
55 
56 typedef std::vector<DIERef> DIEArray;
57 
58 #endif // SymbolFileDWARF_DIERef_h_
59