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

   1 //===-- DWARFDebugMacinfoEntry.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 "DWARFDebugMacinfoEntry.h"
  11
  12 #include "lldb/Core/Stream.h"
  13
  14 using namespace lldb_private;
  15 using namespace std;
  16
  17 DWARFDebugMacinfoEntry::DWARFDebugMacinfoEntry() :
  18     m_type_code(0),
  19     m_line(0),
  20     m_op2()
  21 {
  22     m_op2.cstr = NULL;
  23 }
  24
  25 DWARFDebugMacinfoEntry::~DWARFDebugMacinfoEntry()
  26 {
  27 }
  28
  29 const char*
  30 DWARFDebugMacinfoEntry::GetCString() const
  31 {
  32     switch (m_type_code)
  33     {
  34     case 0:
  35     case DW_MACINFO_start_file:
  36     case DW_MACINFO_end_file:
  37         return NULL;
  38     default:
  39         break;
  40     }
  41     return m_op2.cstr;
  42 }
  43
  44
  45
  46 void
  47 DWARFDebugMacinfoEntry::Dump(Stream *s) const
  48 {
  49     if (m_type_code)
  50     {
  51         s->PutCString(DW_MACINFO_value_to_name(m_type_code));
  52
  53         switch (m_type_code)
  54         {
  55         case DW_MACINFO_define:
  56             s->Printf(" line:%u  #define %s\n", (uint32_t)m_line, m_op2.cstr);
  57             break;
  58
  59         case DW_MACINFO_undef:
  60             s->Printf(" line:%u  #undef %s\n", (uint32_t)m_line, m_op2.cstr);
  61             break;
  62
  63         default:
  64             s->Printf(" line:%u  str: '%s'\n", (uint32_t)m_line, m_op2.cstr);
  65             break;
  66
  67         case DW_MACINFO_start_file:
  68             s->Printf(" line:%u  file index: '%u'\n", (uint32_t)m_line, (uint32_t)m_op2.file_idx);
  69             break;
  70
  71         case DW_MACINFO_end_file:
  72             break;
  73         }
  74     }
  75     else
  76     {
  77         s->PutCString(" END\n");
  78     }
  79 }
  80
  81
  82 bool
  83 DWARFDebugMacinfoEntry::Extract(const DataExtractor& mac_info_data, lldb::offset_t* offset_ptr)
  84 {
  85     if (mac_info_data.ValidOffset(*offset_ptr))
  86     {
  87         m_type_code = mac_info_data.GetU8(offset_ptr);
  88
  89         switch (m_type_code)
  90         {
  91
  92         case DW_MACINFO_define:
  93         case DW_MACINFO_undef:
  94             // 2 operands:
  95             // Arg 1: operand encodes the line number of the source line on which
  96             //      the relevant defining or undefining pre-processor directives
  97             //      appeared.
  98             m_line  = mac_info_data.GetULEB128(offset_ptr);
  99             // Arg 2: define string
 100             m_op2.cstr  = mac_info_data.GetCStr(offset_ptr);
 101             break;
 102
 103         case DW_MACINFO_start_file:
 104             // 2 operands:
 105             // Op 1: line number of the source line on which the inclusion
 106             //      pre-processor directive occurred.
 107             m_line  = mac_info_data.GetULEB128(offset_ptr);
 108             // Op 2: a source file name index to a file number in the statement
 109             //      information table for the relevant compilation unit.
 110             m_op2.file_idx  = mac_info_data.GetULEB128(offset_ptr);
 111             break;
 112
 113         case 0: // End of list
 114         case DW_MACINFO_end_file:
 115             // No operands
 116             m_line = DW_INVALID_OFFSET;
 117             m_op2.cstr = NULL;
 118             break;
 119         default:
 120             // Vendor specific entries always have a ULEB128 and a string
 121             m_line      = mac_info_data.GetULEB128(offset_ptr);
 122             m_op2.cstr  = mac_info_data.GetCStr(offset_ptr);
 123             break;
 124         }
 125         return true;
 126     }
 127     else
 128         m_type_code = 0;
 129
 130     return false;
 131 }
 132