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LibDebug: Parse DWARF address ranges using Core::Stream

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This commit is contained in:
Tim Schumacher 2023-01-21 12:50:04 +01:00 • committed by Andreas Kling
parent 908b88db34
commit e235c42e4d
3 changed files with 56 additions and 50 deletions
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68
Userland/Libraries/LibDebug/Dwarf/AddressRanges.cpp
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@ -6,34 +6,34 @@
#include "AddressRanges.h"
#include "DwarfTypes.h"
#include <AK/LEB128.h>
#include <LibCore/Stream.h>
namespace Debug::Dwarf {
AddressRangesV5::AddressRangesV5(ReadonlyBytes range_lists_data, size_t offset, CompilationUnit const& compilation_unit)
: m_range_lists_stream(range_lists_data)
AddressRangesV5::AddressRangesV5(NonnullOwnPtr<Core::Stream::Stream> range_lists_stream, CompilationUnit const& compilation_unit)
: m_range_lists_stream(move(range_lists_stream))
, m_compilation_unit(compilation_unit)
{
m_range_lists_stream.seek(offset);
}
void AddressRangesV5::for_each_range(Function<void(Range)> callback)
ErrorOr<void> AddressRangesV5::for_each_range(Function<void(Range)> callback)
{
// Dwarf version 5, section 2.17.3 "Non-Contiguous Address Ranges"
Core::Stream::WrapInAKInputStream wrapped_range_lists_stream { *m_range_lists_stream };
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;
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: {
FlatPtr base;
m_range_lists_stream >> base;
current_base_address = base;
current_base_address = TRY(m_range_lists_stream->read_value<FlatPtr>());
break;
}
case RangeListEntryType::BaseAddressX: {
FlatPtr index;
m_range_lists_stream.read_LEB128_unsigned(index);
LEB128::read_unsigned(wrapped_range_lists_stream, index);
current_base_address = m_compilation_unit.get_address(index);
break;
}
@ -43,68 +43,66 @@ void AddressRangesV5::for_each_range(Function<void(Range)> callback)
base_address = m_compilation_unit.base_address();
}
if (!base_address.has_value()) {
dbgln("expected base_address for rangelist");
return;
}
if (!base_address.has_value())
return Error::from_string_literal("Expected base_address for rangelist");
size_t start_offset, end_offset;
m_range_lists_stream.read_LEB128_unsigned(start_offset);
m_range_lists_stream.read_LEB128_unsigned(end_offset);
LEB128::read_unsigned(wrapped_range_lists_stream, start_offset);
LEB128::read_unsigned(wrapped_range_lists_stream, end_offset);
callback(Range { start_offset + *base_address, end_offset + *base_address });
break;
}
case RangeListEntryType::StartLength: {
FlatPtr start;
m_range_lists_stream >> start;
auto start = TRY(m_range_lists_stream->read_value<FlatPtr>());
size_t length;
m_range_lists_stream.read_LEB128_unsigned(length);
LEB128::read_unsigned(wrapped_range_lists_stream, length);
callback(Range { start, start + length });
break;
}
case RangeListEntryType::StartXEndX: {
size_t start, end;
m_range_lists_stream.read_LEB128_unsigned(start);
m_range_lists_stream.read_LEB128_unsigned(end);
LEB128::read_unsigned(wrapped_range_lists_stream, start);
LEB128::read_unsigned(wrapped_range_lists_stream, end);
callback(Range { m_compilation_unit.get_address(start), m_compilation_unit.get_address(end) });
break;
}
case RangeListEntryType::StartXLength: {
size_t start, length;
m_range_lists_stream.read_LEB128_unsigned(start);
m_range_lists_stream.read_LEB128_unsigned(length);
LEB128::read_unsigned(wrapped_range_lists_stream, start);
LEB128::read_unsigned(wrapped_range_lists_stream, length);
auto start_addr = m_compilation_unit.get_address(start);
callback(Range { start_addr, start_addr + length });
break;
}
case RangeListEntryType::EndOfList:
return;
return {};
default:
dbgln("unsupported range list entry type: 0x{:x}", entry_type);
return;
return Error::from_string_literal("Unsupported range list entry type");
}
}
return {};
}
AddressRangesV4::AddressRangesV4(ReadonlyBytes ranges_data, size_t offset, CompilationUnit const& compilation_unit)
: m_ranges_stream(ranges_data)
AddressRangesV4::AddressRangesV4(NonnullOwnPtr<Core::Stream::Stream> ranges_stream, CompilationUnit const& compilation_unit)
: m_ranges_stream(move(ranges_stream))
, m_compilation_unit(compilation_unit)
{
m_ranges_stream.seek(offset);
}
void AddressRangesV4::for_each_range(Function<void(Range)> callback)
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.eof() && !m_ranges_stream.has_any_error()) {
FlatPtr begin, end;
m_ranges_stream >> begin >> end;
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;
return {};
} else if (begin == explode_byte(0xff)) {
current_base_address = end;
} else {
@ -112,6 +110,8 @@ void AddressRangesV4::for_each_range(Function<void(Range)> callback)
callback({ base + begin, base + end });
}
}
return {};
}
}