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

   1 //===-- DWARFAbbreviationDeclaration.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 "DWARFAbbreviationDeclaration.h"
  11
  12 #include "lldb/Core/dwarf.h"
  13 #include "lldb/Utility/Stream.h"
  14
  15 #include "DWARFFormValue.h"
  16
  17 using namespace lldb_private;
  18
  19 DWARFAbbreviationDeclaration::DWARFAbbreviationDeclaration()
  20     : m_code(InvalidCode), m_tag(0), m_has_children(0), m_attributes() {}
  21
  22 DWARFAbbreviationDeclaration::DWARFAbbreviationDeclaration(dw_tag_t tag,
  23                                                            uint8_t has_children)
  24     : m_code(InvalidCode), m_tag(tag), m_has_children(has_children),
  25       m_attributes() {}
  26
  27 bool DWARFAbbreviationDeclaration::Extract(const DWARFDataExtractor &data,
  28                                            lldb::offset_t *offset_ptr) {
  29   return Extract(data, offset_ptr, data.GetULEB128(offset_ptr));
  30 }
  31
  32 bool DWARFAbbreviationDeclaration::Extract(const DWARFDataExtractor &data,
  33                                            lldb::offset_t *offset_ptr,
  34                                            dw_uleb128_t code) {
  35   m_code = code;
  36   m_attributes.clear();
  37   if (m_code) {
  38     m_tag = data.GetULEB128(offset_ptr);
  39     m_has_children = data.GetU8(offset_ptr);
  40
  41     while (data.ValidOffset(*offset_ptr)) {
  42       dw_attr_t attr = data.GetULEB128(offset_ptr);
  43       dw_form_t form = data.GetULEB128(offset_ptr);
  44
  45       if (attr && form)
  46         m_attributes.push_back(DWARFAttribute(attr, form));
  47       else
  48         break;
  49     }
  50
  51     return m_tag != 0;
  52   } else {
  53     m_tag = 0;
  54     m_has_children = 0;
  55   }
  56
  57   return false;
  58 }
  59
  60 void DWARFAbbreviationDeclaration::Dump(Stream *s) const {
  61   s->Printf("Debug Abbreviation Declaration: code = 0x%4.4x, tag = %s, "
  62             "has_children = %s\n",
  63             m_code, DW_TAG_value_to_name(m_tag),
  64             DW_CHILDREN_value_to_name(m_has_children));
  65
  66   DWARFAttribute::const_iterator pos;
  67
  68   for (pos = m_attributes.begin(); pos != m_attributes.end(); ++pos)
  69     s->Printf("        attr = %s, form = %s\n",
  70               DW_AT_value_to_name(pos->get_attr()),
  71               DW_FORM_value_to_name(pos->get_form()));
  72
  73   s->Printf("\n");
  74 }
  75
  76 bool DWARFAbbreviationDeclaration::IsValid() {
  77   return m_code != 0 && m_tag != 0;
  78 }
  79
  80 uint32_t
  81 DWARFAbbreviationDeclaration::FindAttributeIndex(dw_attr_t attr) const {
  82   uint32_t i;
  83   const uint32_t kNumAttributes = m_attributes.size();
  84   for (i = 0; i < kNumAttributes; ++i) {
  85     if (m_attributes[i].get_attr() == attr)
  86       return i;
  87   }
  88   return DW_INVALID_INDEX;
  89 }
  90
  91 bool DWARFAbbreviationDeclaration::
  92 operator==(const DWARFAbbreviationDeclaration &rhs) const {
  93   return Tag() == rhs.Tag() && HasChildren() == rhs.HasChildren() &&
  94          Attributes() == rhs.Attributes();
  95 }