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LibDebug: Propagate errors throughout DWARF parsing

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Splitting this into a separate commit was an afterthought, so this does
not yet feature any fallible operations.
This commit is contained in:
Tim Schumacher 2023-01-22 00:32:08 +01:00 • committed by Andreas Kling
parent e235c42e4d
commit e62269650a
17 changed files with 243 additions and 204 deletions
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76
Userland/Libraries/LibDebug/Dwarf/DwarfInfo.cpp
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@ -29,7 +29,7 @@ DwarfInfo::DwarfInfo(ELF::Image const& elf)
m_debug_addr_data = section_data(".debug_addr"sv);
m_debug_ranges_data = section_data(".debug_ranges"sv);
populate_compilation_units();
populate_compilation_units().release_value_but_fixme_should_propagate_errors();
}
DwarfInfo::~DwarfInfo() = default;
@ -42,10 +42,10 @@ ReadonlyBytes DwarfInfo::section_data(StringView section_name) const
return section->bytes();
}
void DwarfInfo::populate_compilation_units()
ErrorOr<void> DwarfInfo::populate_compilation_units()
{
if (!m_debug_info_data.data())
return;
return {};
InputMemoryStream debug_info_stream { m_debug_info_data };
InputMemoryStream line_info_stream { m_debug_line_data };
@ -77,20 +77,22 @@ void DwarfInfo::populate_compilation_units()
}
VERIFY(line_info_stream.eof());
return {};
}
AttributeValue DwarfInfo::get_attribute_value(AttributeDataForm form, ssize_t implicit_const_value,
ErrorOr<AttributeValue> DwarfInfo::get_attribute_value(AttributeDataForm form, ssize_t implicit_const_value,
InputMemoryStream& debug_info_stream, CompilationUnit const* unit) const
{
AttributeValue value;
value.m_form = form;
value.m_compilation_unit = unit;
auto assign_raw_bytes_value = [&](size_t length) {
auto assign_raw_bytes_value = [&](size_t length) -> ErrorOr<void> {
value.m_data.as_raw_bytes = { debug_info_data().offset_pointer(debug_info_stream.offset()), length };
debug_info_stream.discard_or_error(length);
VERIFY(!debug_info_stream.has_any_error());
return {};
};
switch (form) {
@ -170,7 +172,7 @@ AttributeValue DwarfInfo::get_attribute_value(AttributeDataForm form, ssize_t im
}
case AttributeDataForm::Data16: {
value.m_type = AttributeValue::Type::RawBytes;
assign_raw_bytes_value(16);
TRY(assign_raw_bytes_value(16));
VERIFY(!debug_info_stream.has_any_error());
break;
}
@ -193,7 +195,7 @@ AttributeValue DwarfInfo::get_attribute_value(AttributeDataForm form, ssize_t im
debug_info_stream.read_LEB128_unsigned(length);
VERIFY(!debug_info_stream.has_any_error());
value.m_type = AttributeValue::Type::DwarfExpression;
assign_raw_bytes_value(length);
TRY(assign_raw_bytes_value(length));
break;
}
case AttributeDataForm::String: {
@ -210,7 +212,7 @@ AttributeValue DwarfInfo::get_attribute_value(AttributeDataForm form, ssize_t im
u8 length;
debug_info_stream >> length;
VERIFY(!debug_info_stream.has_any_error());
assign_raw_bytes_value(length);
TRY(assign_raw_bytes_value(length));
break;
}
case AttributeDataForm::Block2: {
@ -218,7 +220,7 @@ AttributeValue DwarfInfo::get_attribute_value(AttributeDataForm form, ssize_t im
u16 length;
debug_info_stream >> length;
VERIFY(!debug_info_stream.has_any_error());
assign_raw_bytes_value(length);
TRY(assign_raw_bytes_value(length));
break;
}
case AttributeDataForm::Block4: {
@ -226,7 +228,7 @@ AttributeValue DwarfInfo::get_attribute_value(AttributeDataForm form, ssize_t im
u32 length;
debug_info_stream >> length;
VERIFY(!debug_info_stream.has_any_error());
assign_raw_bytes_value(length);
TRY(assign_raw_bytes_value(length));
break;
}
case AttributeDataForm::Block: {
@ -234,7 +236,7 @@ AttributeValue DwarfInfo::get_attribute_value(AttributeDataForm form, ssize_t im
size_t length;
debug_info_stream.read_LEB128_unsigned(length);
VERIFY(!debug_info_stream.has_any_error());
assign_raw_bytes_value(length);
TRY(assign_raw_bytes_value(length));
break;
}
case AttributeDataForm::LineStrP: {
@ -332,21 +334,21 @@ AttributeValue DwarfInfo::get_attribute_value(AttributeDataForm form, ssize_t im
return value;
}
void DwarfInfo::build_cached_dies() const
ErrorOr<void> DwarfInfo::build_cached_dies() const
{
auto insert_to_cache = [this](DIE const& die, DIERange const& range) {
m_cached_dies_by_range.insert(range.start_address, DIEAndRange { die, range });
m_cached_dies_by_offset.insert(die.offset(), die);
};
auto get_ranges_of_die = [this](DIE const& die) -> ErrorOr<Vector<DIERange>> {
auto ranges = die.get_attribute(Attribute::Ranges);
auto ranges = TRY(die.get_attribute(Attribute::Ranges));
if (ranges.has_value()) {
size_t offset;
if (ranges->form() == AttributeDataForm::SecOffset) {
offset = ranges->as_unsigned();
} else {
auto index = ranges->as_unsigned();
auto base = die.compilation_unit().range_lists_base();
auto base = TRY(die.compilation_unit().range_lists_base());
// FIXME: This assumes that the format is DWARf32
auto offsets = debug_range_lists_data().slice(base);
offset = ByteReader::load32(offsets.offset_pointer(index * sizeof(u32))) + base;
@ -371,8 +373,8 @@ void DwarfInfo::build_cached_dies() const
return entries;
}
auto start = die.get_attribute(Attribute::LowPc);
auto end = die.get_attribute(Attribute::HighPc);
auto start = TRY(die.get_attribute(Attribute::LowPc));
auto end = TRY(die.get_attribute(Attribute::HighPc));
if (!start.has_value() || !end.has_value())
return Vector<DIERange> {};
@ -384,40 +386,44 @@ void DwarfInfo::build_cached_dies() const
uint32_t range_end = 0;
if (end->form() == Dwarf::AttributeDataForm::Addr)
range_end = end->as_addr();
range_end = TRY(end->as_addr());
else
range_end = start->as_addr() + end->as_unsigned();
range_end = TRY(start->as_addr()) + end->as_unsigned();
return Vector<DIERange> { DIERange { start.value().as_addr(), range_end } };
return Vector<DIERange> { DIERange { TRY(start.value().as_addr()), range_end } };
};
// If we simply use a lambda, type deduction fails because it's used recursively.
Function<void(DIE const& die)> insert_to_cache_recursively;
insert_to_cache_recursively = [&](DIE const& die) {
Function<ErrorOr<void>(DIE const& die)> insert_to_cache_recursively;
insert_to_cache_recursively = [&](DIE const& die) -> ErrorOr<void> {
if (die.offset() == 0 || die.parent_offset().has_value()) {
auto ranges = get_ranges_of_die(die).release_value_but_fixme_should_propagate_errors();
auto ranges = TRY(get_ranges_of_die(die));
for (auto& range : ranges) {
insert_to_cache(die, range);
}
}
die.for_each_child([&](DIE const& child) {
TRY(die.for_each_child([&](DIE const& child) -> ErrorOr<void> {
if (!child.is_null()) {
insert_to_cache_recursively(child);
TRY(insert_to_cache_recursively(child));
}
});
return {};
}));
return {};
};
for_each_compilation_unit([&](CompilationUnit const& compilation_unit) {
insert_to_cache_recursively(compilation_unit.root_die());
});
TRY(for_each_compilation_unit([&](CompilationUnit const& compilation_unit) -> ErrorOr<void> {
TRY(insert_to_cache_recursively(compilation_unit.root_die()));
return {};
}));
m_built_cached_dies = true;
return {};
}
Optional<DIE> DwarfInfo::get_die_at_address(FlatPtr address) const
ErrorOr<Optional<DIE>> DwarfInfo::get_die_at_address(FlatPtr address) const
{
if (!m_built_cached_dies)
build_cached_dies();
TRY(build_cached_dies());
auto iter = m_cached_dies_by_range.find_largest_not_above_iterator(address);
while (!iter.is_end() && !iter.is_begin() && iter->range.end_address < address) {
@ -425,23 +431,23 @@ Optional<DIE> DwarfInfo::get_die_at_address(FlatPtr address) const
}
if (iter.is_end())
return {};
return Optional<DIE> {};
if (iter->range.start_address > address || iter->range.end_address < address) {
return {};
return Optional<DIE> {};
}
return iter->die;
}
Optional<DIE> DwarfInfo::get_cached_die_at_offset(FlatPtr offset) const
ErrorOr<Optional<DIE>> DwarfInfo::get_cached_die_at_offset(FlatPtr offset) const
{
if (!m_built_cached_dies)
build_cached_dies();
TRY(build_cached_dies());
auto* die = m_cached_dies_by_offset.find(offset);
if (!die)
return {};
return Optional<DIE> {};
return *die;
}