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LibDebug: Support parsing non-contiguous DWARF address ranges

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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.
This commit is contained in:
Itamar 2021-09-28 13:19:32 +03:00 • committed by Andreas Kling
parent 2b04a86d4d
commit 26a96d315d
4 changed files with 115 additions and 0 deletions
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67
Userland/Libraries/LibDebug/Dwarf/AddressRanges.cpp Normal file
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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"
namespace Debug::Dwarf {
AddressRanges::AddressRanges(ReadonlyBytes range_lists_data, size_t offset, CompilationUnit const& compilation_unit)
: m_range_lists_stream(range_lists_data)
, m_compilation_unit(compilation_unit)
{
m_range_lists_stream.seek(offset);
}
void AddressRanges::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.eof() && !m_range_lists_stream.has_any_error()) {
u8 entry_type;
m_range_lists_stream >> entry_type;
switch (static_cast<RangeListEntryType>(entry_type)) {
case RangeListEntryType::BaseAddress: {
FlatPtr base;
m_range_lists_stream >> base;
current_base_address = base;
break;
}
case RangeListEntryType::OffsetPair: {
Optional<FlatPtr> base_address = current_base_address;
if (!base_address.has_value()) {
base_address = m_compilation_unit.base_address();
}
if (!base_address.has_value()) {
dbgln("expected base_address for rangelist");
return;
}
size_t start_offset, end_offset;
m_range_lists_stream.read_LEB128_unsigned(start_offset);
m_range_lists_stream.read_LEB128_unsigned(end_offset);
callback(Range { start_offset + *base_address, end_offset + *base_address });
break;
}
case RangeListEntryType::StartLength: {
FlatPtr start;
m_range_lists_stream >> start;
size_t length;
m_range_lists_stream.read_LEB128_unsigned(length);
callback(Range { start, start + length });
}
case RangeListEntryType::EndOfList:
return;
default:
dbgln("unsupported range list entry type: 0x{:x}", (int)entry_type);
return;
}
}
}
}