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/*
* Copyright (c) 2020-2021, Itamar S. <itamar8910@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "AddressRanges.h"
#include "DwarfTypes.h"
#include <AK/LEB128.h>
#include <LibCore/Stream.h>
namespace Debug::Dwarf {
AddressRangesV5::AddressRangesV5(NonnullOwnPtr<AK::Stream> range_lists_stream, CompilationUnit const& compilation_unit)
: m_range_lists_stream(move(range_lists_stream))
, m_compilation_unit(compilation_unit)
{
}
ErrorOr<void> AddressRangesV5::for_each_range(Function<void(Range)> callback)
{
// Dwarf version 5, section 2.17.3 "Non-Contiguous Address Ranges"
Optional<FlatPtr> current_base_address;
while (!m_range_lists_stream->is_eof()) {
auto entry_type = TRY(m_range_lists_stream->read_value<u8>());
switch (static_cast<RangeListEntryType>(entry_type)) {
case RangeListEntryType::BaseAddress: {
current_base_address = TRY(m_range_lists_stream->read_value<FlatPtr>());
break;
}
case RangeListEntryType::BaseAddressX: {
FlatPtr index;
TRY(LEB128::read_unsigned(*m_range_lists_stream, index));
current_base_address = TRY(m_compilation_unit.get_address(index));
break;
}
case RangeListEntryType::OffsetPair: {
Optional<FlatPtr> base_address = current_base_address;
if (!base_address.has_value()) {
base_address = TRY(m_compilation_unit.base_address());
}
if (!base_address.has_value())
return Error::from_string_literal("Expected base_address for rangelist");
size_t start_offset, end_offset;
TRY(LEB128::read_unsigned(*m_range_lists_stream, start_offset));
TRY(LEB128::read_unsigned(*m_range_lists_stream, end_offset));
callback(Range { start_offset + *base_address, end_offset + *base_address });
break;
}
case RangeListEntryType::StartLength: {
auto start = TRY(m_range_lists_stream->read_value<FlatPtr>());
size_t length;
TRY(LEB128::read_unsigned(*m_range_lists_stream, length));
callback(Range { start, start + length });
break;
}
case RangeListEntryType::StartXEndX: {
size_t start, end;
TRY(LEB128::read_unsigned(*m_range_lists_stream, start));
TRY(LEB128::read_unsigned(*m_range_lists_stream, end));
callback(Range { TRY(m_compilation_unit.get_address(start)), TRY(m_compilation_unit.get_address(end)) });
break;
}
case RangeListEntryType::StartXLength: {
size_t start, length;
TRY(LEB128::read_unsigned(*m_range_lists_stream, start));
TRY(LEB128::read_unsigned(*m_range_lists_stream, length));
auto start_addr = TRY(m_compilation_unit.get_address(start));
callback(Range { start_addr, start_addr + length });
break;
}
case RangeListEntryType::EndOfList:
return {};
default:
dbgln("unsupported range list entry type: 0x{:x}", entry_type);
return Error::from_string_literal("Unsupported range list entry type");
}
}
return {};
}
AddressRangesV4::AddressRangesV4(NonnullOwnPtr<AK::Stream> ranges_stream, CompilationUnit const& compilation_unit)
: m_ranges_stream(move(ranges_stream))
, m_compilation_unit(compilation_unit)
{
}
ErrorOr<void> AddressRangesV4::for_each_range(Function<void(Range)> callback)
{
// Dwarf version 4, section 2.17.3 "Non-Contiguous Address Ranges"
Optional<FlatPtr> current_base_address;
while (!m_ranges_stream->is_eof()) {
auto begin = TRY(m_ranges_stream->read_value<FlatPtr>());
auto end = TRY(m_ranges_stream->read_value<FlatPtr>());
if (begin == 0 && end == 0) {
// end of list entry
return {};
} else if (begin == explode_byte(0xff)) {
current_base_address = end;
} else {
FlatPtr base = current_base_address.value_or(TRY(m_compilation_unit.base_address()).value_or(0));
callback({ base + begin, base + end });
}
}
return {};
}
}
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