lldb/source/Plugins/SymbolFile/DWARF/DWARFDeclContext.cpp

   1 //===-- DWARFDeclContext.cpp ----------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "DWARFDeclContext.h"
  10 #include "llvm/Support/raw_ostream.h"
  11
  12 using namespace lldb_private::dwarf;
  13 using namespace lldb_private::plugin::dwarf;
  14
  15 const char *DWARFDeclContext::Entry::GetName() const {
  16   if (name != nullptr)
  17     return name;
  18   if (tag == DW_TAG_namespace)
  19     return "(anonymous namespace)";
  20   if (tag == DW_TAG_class_type)
  21     return "(anonymous class)";
  22   if (tag == DW_TAG_structure_type)
  23     return "(anonymous struct)";
  24   if (tag == DW_TAG_union_type)
  25     return "(anonymous union)";
  26   return "(anonymous)";
  27 }
  28
  29 const char *DWARFDeclContext::GetQualifiedName() const {
  30   if (m_qualified_name.empty()) {
  31     // The declaration context array for a class named "foo" in namespace
  32     // "a::b::c" will be something like:
  33     //  [0] DW_TAG_class_type "foo"
  34     //  [1] DW_TAG_namespace "c"
  35     //  [2] DW_TAG_namespace "b"
  36     //  [3] DW_TAG_namespace "a"
  37     if (!m_entries.empty()) {
  38       if (m_entries.size() == 1) {
  39         if (m_entries[0].name) {
  40           m_qualified_name.append("::");
  41           m_qualified_name.append(m_entries[0].name);
  42         }
  43       } else {
  44         llvm::raw_string_ostream string_stream(m_qualified_name);
  45         llvm::interleave(
  46             llvm::reverse(m_entries), string_stream,
  47             [&](auto entry) { string_stream << entry.GetName(); }, "::");
  48       }
  49     }
  50   }
  51   if (m_qualified_name.empty())
  52     return nullptr;
  53   return m_qualified_name.c_str();
  54 }
  55
  56 bool DWARFDeclContext::operator==(const DWARFDeclContext &rhs) const {
  57   if (m_entries.size() != rhs.m_entries.size())
  58     return false;
  59
  60   collection::const_iterator pos;
  61   collection::const_iterator begin = m_entries.begin();
  62   collection::const_iterator end = m_entries.end();
  63
  64   collection::const_iterator rhs_pos;
  65   collection::const_iterator rhs_begin = rhs.m_entries.begin();
  66   // The two entry arrays have the same size
  67
  68   // First compare the tags before we do expensive name compares
  69   for (pos = begin, rhs_pos = rhs_begin; pos != end; ++pos, ++rhs_pos) {
  70     if (pos->tag != rhs_pos->tag) {
  71       // Check for DW_TAG_structure_type and DW_TAG_class_type as they are
  72       // often used interchangeably in GCC
  73       if (pos->tag == DW_TAG_structure_type &&
  74           rhs_pos->tag == DW_TAG_class_type)
  75         continue;
  76       if (pos->tag == DW_TAG_class_type &&
  77           rhs_pos->tag == DW_TAG_structure_type)
  78         continue;
  79       return false;
  80     }
  81   }
  82   // The tags all match, now compare the names
  83   for (pos = begin, rhs_pos = rhs_begin; pos != end; ++pos, ++rhs_pos) {
  84     if (!pos->NameMatches(*rhs_pos))
  85       return false;
  86   }
  87   // All tags and names match
  88   return true;
  89 }