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

   1 //===-- DWARFDebugAranges.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 "DWARFDebugAranges.h"
  10 #include "DWARFUnit.h"
  11 #include "LogChannelDWARF.h"
  12 #include "lldb/Utility/Log.h"
  13 #include "lldb/Utility/Timer.h"
  14 #include "llvm/DebugInfo/DWARF/DWARFDebugArangeSet.h"
  15
  16 using namespace lldb;
  17 using namespace lldb_private;
  18 using namespace lldb_private::plugin::dwarf;
  19 using llvm::DWARFDebugArangeSet;
  20
  21 // Constructor
  22 DWARFDebugAranges::DWARFDebugAranges() : m_aranges() {}
  23
  24 // Extract
  25 void DWARFDebugAranges::extract(const DWARFDataExtractor &debug_aranges_data) {
  26   llvm::DWARFDataExtractor dwarf_data = debug_aranges_data.GetAsLLVMDWARF();
  27   lldb::offset_t offset = 0;
  28
  29   DWARFDebugArangeSet set;
  30   Range range;
  31   while (dwarf_data.isValidOffset(offset)) {
  32     const lldb::offset_t set_offset = offset;
  33     if (llvm::Error error = set.extract(dwarf_data, &offset)) {
  34       Log *log = GetLog(DWARFLog::DebugInfo);
  35       LLDB_LOG_ERROR(log, std::move(error),
  36                      "DWARFDebugAranges::extract failed to extract "
  37                      ".debug_aranges set at offset {1:x}: {0}",
  38                      set_offset);
  39       set.clear();
  40       return;
  41     }
  42     const uint64_t cu_offset = set.getCompileUnitDIEOffset();
  43     for (const auto &desc : set.descriptors()) {
  44       if (desc.Length != 0)
  45         m_aranges.Append(
  46             RangeToDIE::Entry(desc.Address, desc.Length, cu_offset));
  47     }
  48   }
  49 }
  50
  51 void DWARFDebugAranges::Dump(Log *log) const {
  52   if (log == nullptr)
  53     return;
  54
  55   const size_t num_entries = m_aranges.GetSize();
  56   for (size_t i = 0; i < num_entries; ++i) {
  57     const RangeToDIE::Entry *entry = m_aranges.GetEntryAtIndex(i);
  58     if (entry)
  59       LLDB_LOG(log, "{0:x8}: [{1:x16} - {2:x16})", entry->data,
  60                entry->GetRangeBase(), entry->GetRangeEnd());
  61   }
  62 }
  63
  64 void DWARFDebugAranges::AppendRange(dw_offset_t offset, dw_addr_t low_pc,
  65                                     dw_addr_t high_pc) {
  66   if (high_pc > low_pc)
  67     m_aranges.Append(RangeToDIE::Entry(low_pc, high_pc - low_pc, offset));
  68 }
  69
  70 void DWARFDebugAranges::Sort(bool minimize) {
  71   LLDB_SCOPED_TIMER();
  72
  73   m_aranges.Sort();
  74   m_aranges.CombineConsecutiveEntriesWithEqualData();
  75 }
  76
  77 // FindAddress
  78 dw_offset_t DWARFDebugAranges::FindAddress(dw_addr_t address) const {
  79   const RangeToDIE::Entry *entry = m_aranges.FindEntryThatContains(address);
  80   if (entry)
  81     return entry->data;
  82   return DW_INVALID_OFFSET;
  83 }