DIERef.cpp revision 327952 
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
17DIERef::DIERef()
18    : cu_offset(DW_INVALID_OFFSET), die_offset(DW_INVALID_OFFSET) {}
19
20DIERef::DIERef(dw_offset_t c, dw_offset_t d) : cu_offset(c), die_offset(d) {}
21
22DIERef::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
45DIERef::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
59lldb::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 && die_offset != DW_INVALID_OFFSET)
69    return dwarf->GetID() | die_offset;
70  else
71    return LLDB_INVALID_UID;
72}
73