contrib/llvm/tools/lldb/source/Plugins/SymbolFile/DWARF/DIERef.cpp

   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
  17 DIERef::DIERef() :
  18     cu_offset(DW_INVALID_OFFSET),
  19     die_offset(DW_INVALID_OFFSET)
  20 {}
  21
  22 DIERef::DIERef(dw_offset_t c, dw_offset_t d) :
  23     cu_offset(c),
  24     die_offset(d)
  25 {}
  26
  27 DIERef::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
  57 DIERef::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
  75 lldb::user_id_t
  76 DIERef::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