mirror of
https://github.com/RGBCube/serenity
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26a96d315d
This adds support for parsing DWARF "range lists", which are identified by the DW_AT_ranges form. They contain code addresses for DIEs whose location is not contiguous.
67 lines
2.1 KiB
C++
67 lines
2.1 KiB
C++
/*
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* Copyright (c) 2020-2021, Itamar S. <itamar8910@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "AddressRanges.h"
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#include "DwarfTypes.h"
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namespace Debug::Dwarf {
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AddressRanges::AddressRanges(ReadonlyBytes range_lists_data, size_t offset, CompilationUnit const& compilation_unit)
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: m_range_lists_stream(range_lists_data)
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, m_compilation_unit(compilation_unit)
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{
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m_range_lists_stream.seek(offset);
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}
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void AddressRanges::for_each_range(Function<void(Range)> callback)
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{
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// Dwarf version 5, section 2.17.3 "Non-Contiguous Address Ranges"
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Optional<FlatPtr> current_base_address;
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while (!m_range_lists_stream.eof() && !m_range_lists_stream.has_any_error()) {
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u8 entry_type;
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m_range_lists_stream >> entry_type;
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switch (static_cast<RangeListEntryType>(entry_type)) {
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case RangeListEntryType::BaseAddress: {
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FlatPtr base;
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m_range_lists_stream >> base;
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current_base_address = base;
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break;
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}
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case RangeListEntryType::OffsetPair: {
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Optional<FlatPtr> base_address = current_base_address;
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if (!base_address.has_value()) {
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base_address = m_compilation_unit.base_address();
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}
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if (!base_address.has_value()) {
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dbgln("expected base_address for rangelist");
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return;
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}
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size_t start_offset, end_offset;
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m_range_lists_stream.read_LEB128_unsigned(start_offset);
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m_range_lists_stream.read_LEB128_unsigned(end_offset);
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callback(Range { start_offset + *base_address, end_offset + *base_address });
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break;
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}
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case RangeListEntryType::StartLength: {
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FlatPtr start;
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m_range_lists_stream >> start;
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size_t length;
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m_range_lists_stream.read_LEB128_unsigned(length);
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callback(Range { start, start + length });
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}
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case RangeListEntryType::EndOfList:
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return;
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default:
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dbgln("unsupported range list entry type: 0x{:x}", (int)entry_type);
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return;
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}
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}
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}
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}
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