1 //===-- DIERef.cpp ----------------------------------------------*- 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 #include "DIERef.h"
11 #include "DWARFCompileUnit.h"
12 #include "DWARFDebugInfo.h"
13 #include "DWARFFormValue.h"
14 #include "SymbolFileDWARF.h"
15 #include "SymbolFileDWARFDebugMap.h"
16 
17 DIERef::DIERef()
18     : cu_offset(DW_INVALID_OFFSET), die_offset(DW_INVALID_OFFSET) {}
19 
20 DIERef::DIERef(dw_offset_t c, dw_offset_t d) : cu_offset(c), die_offset(d) {}
21 
22 DIERef::DIERef(lldb::user_id_t uid, SymbolFileDWARF *dwarf)
23     : cu_offset(DW_INVALID_OFFSET), die_offset(uid & 0xffffffff) {
24   SymbolFileDWARFDebugMap *debug_map = dwarf->GetDebugMapSymfile();
25   if (debug_map) {
26     const uint32_t oso_idx = debug_map->GetOSOIndexFromUserID(uid);
27     SymbolFileDWARF *actual_dwarf = debug_map->GetSymbolFileByOSOIndex(oso_idx);
28     if (actual_dwarf) {
29       DWARFDebugInfo *debug_info = actual_dwarf->DebugInfo();
30       if (debug_info) {
31         DWARFCompileUnit *dwarf_cu =
32             debug_info->GetCompileUnitContainingDIEOffset(die_offset);
33         if (dwarf_cu) {
34           cu_offset = dwarf_cu->GetOffset();
35           return;
36         }
37       }
38     }
39     die_offset = DW_INVALID_OFFSET;
40   } else {
41     cu_offset = uid >> 32;
42   }
43 }
44 
45 DIERef::DIERef(const DWARFFormValue &form_value)
46     : cu_offset(DW_INVALID_OFFSET), die_offset(DW_INVALID_OFFSET) {
47   if (form_value.IsValid()) {
48     const DWARFCompileUnit *dwarf_cu = form_value.GetCompileUnit();
49     if (dwarf_cu) {
50       if (dwarf_cu->GetBaseObjOffset() != DW_INVALID_OFFSET)
51         cu_offset = dwarf_cu->GetBaseObjOffset();
52       else
53         cu_offset = dwarf_cu->GetOffset();
54     }
55     die_offset = form_value.Reference();
56   }
57 }
58 
59 lldb::user_id_t DIERef::GetUID(SymbolFileDWARF *dwarf) const {
60   //----------------------------------------------------------------------
61   // Each SymbolFileDWARF will set its ID to what is expected.
62   //
63   // SymbolFileDWARF, when used for DWARF with .o files on MacOSX, has the
64   // ID set to the compile unit index.
65   //
66   // SymbolFileDWARFDwo sets the ID to the compile unit offset.
67   //----------------------------------------------------------------------
68   if (dwarf)
69     return dwarf->GetID() | die_offset;
70   else
71     return LLDB_INVALID_UID;
72 }
73