DIERef.cpp revision 309124 
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 "DWARFFormValue.h"
13#include "DWARFDebugInfo.h"
14#include "SymbolFileDWARF.h"
15#include "SymbolFileDWARFDebugMap.h"
16
17DIERef::DIERef() :
18    cu_offset(DW_INVALID_OFFSET),
19    die_offset(DW_INVALID_OFFSET)
20{}
21
22DIERef::DIERef(dw_offset_t c, dw_offset_t d) :
23    cu_offset(c),
24    die_offset(d)
25{}
26
27DIERef::DIERef(lldb::user_id_t uid, SymbolFileDWARF *dwarf) :
28    cu_offset(DW_INVALID_OFFSET),
29    die_offset(uid&0xffffffff)
30{
31    SymbolFileDWARFDebugMap *debug_map = dwarf->GetDebugMapSymfile();
32    if (debug_map)
33    {
34        const uint32_t oso_idx = debug_map->GetOSOIndexFromUserID(uid);
35        SymbolFileDWARF *actual_dwarf = debug_map->GetSymbolFileByOSOIndex(oso_idx);
36        if (actual_dwarf)
37        {
38            DWARFDebugInfo *debug_info = actual_dwarf->DebugInfo();
39            if (debug_info)
40            {
41                DWARFCompileUnit *dwarf_cu = debug_info->GetCompileUnitContainingDIEOffset(die_offset);
42                if (dwarf_cu)
43                {
44                    cu_offset = dwarf_cu->GetOffset();
45                    return;
46                }
47            }
48        }
49        die_offset = DW_INVALID_OFFSET;
50    }
51    else
52    {
53        cu_offset = uid>>32;
54    }
55}
56
57DIERef::DIERef(const DWARFFormValue& form_value) :
58    cu_offset(DW_INVALID_OFFSET),
59    die_offset(DW_INVALID_OFFSET)
60{
61    if (form_value.IsValid())
62    {
63        const DWARFCompileUnit* dwarf_cu = form_value.GetCompileUnit();
64        if (dwarf_cu)
65        {
66            if (dwarf_cu->GetBaseObjOffset() != DW_INVALID_OFFSET)
67                cu_offset = dwarf_cu->GetBaseObjOffset();
68            else
69                cu_offset = dwarf_cu->GetOffset();
70        }
71        die_offset = form_value.Reference();
72    }
73}
74
75lldb::user_id_t
76DIERef::GetUID(SymbolFileDWARF *dwarf) const
77{
78    //----------------------------------------------------------------------
79    // Each SymbolFileDWARF will set its ID to what is expected.
80    //
81    // SymbolFileDWARF, when used for DWARF with .o files on MacOSX, has the
82    // ID set to the compile unit index.
83    //
84    // SymbolFileDWARFDwo sets the ID to the compile unit offset.
85    //----------------------------------------------------------------------
86    if (dwarf)
87        return dwarf->GetID() | die_offset;
88    else
89        return LLDB_INVALID_UID;
90}
91
92