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//===-- DWARFDebugRanges.cpp ----------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "DWARFDebugRanges.h"
#include "DWARFUnit.h"
#include "llvm/DebugInfo/DWARF/DWARFDebugRangeList.h"
using namespace lldb_private;
using namespace lldb_private::plugin::dwarf;
DWARFDebugRanges::DWARFDebugRanges() : m_range_map() {}
void DWARFDebugRanges::Extract(DWARFContext &context) {
llvm::DWARFDataExtractor extractor =
context.getOrLoadRangesData().GetAsLLVMDWARF();
llvm::DWARFDebugRangeList extracted_list;
uint64_t current_offset = 0;
auto extract_next_list = [&] {
if (auto error = extracted_list.extract(extractor, ¤t_offset)) {
consumeError(std::move(error));
return false;
}
return true;
};
uint64_t previous_offset = current_offset;
while (extractor.isValidOffset(current_offset) && extract_next_list()) {
DWARFRangeList &lldb_range_list = m_range_map[previous_offset];
lldb_range_list.Reserve(extracted_list.getEntries().size());
for (auto &range : extracted_list.getEntries())
lldb_range_list.Append(range.StartAddress,
range.EndAddress - range.StartAddress);
lldb_range_list.Sort();
previous_offset = current_offset;
}
}
DWARFRangeList
DWARFDebugRanges::FindRanges(const DWARFUnit *cu,
dw_offset_t debug_ranges_offset) const {
dw_addr_t debug_ranges_address = cu->GetRangesBase() + debug_ranges_offset;
auto pos = m_range_map.find(debug_ranges_address);
DWARFRangeList ans =
pos == m_range_map.end() ? DWARFRangeList() : pos->second;
// All DW_AT_ranges are relative to the base address of the compile
// unit. We add the compile unit base address to make sure all the
// addresses are properly fixed up.
ans.Slide(cu->GetBaseAddress());
return ans;
}
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