RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-25 21:07:35 +00:00
Code Issues Activity Actions

LibDebug: Propagate errors throughout DWARF parsing

Browse source 
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
Download patch file Download diff file Expand all files Collapse all files

32
Userland/Libraries/LibDebug/Dwarf/DIE.cpp
View file

@ -15,10 +15,10 @@ namespace Debug::Dwarf {
DIE::DIE(CompilationUnit const& unit, u32 offset, Optional<u32> parent_offset)
: m_compilation_unit(unit)
{
rehydrate_from(offset, parent_offset);
rehydrate_from(offset, parent_offset).release_value_but_fixme_should_propagate_errors();
}
void DIE::rehydrate_from(u32 offset, Optional<u32> parent_offset)
ErrorOr<void> DIE::rehydrate_from(u32 offset, Optional<u32> parent_offset)
{
m_offset = offset;
@ -39,14 +39,15 @@ void DIE::rehydrate_from(u32 offset, Optional<u32> parent_offset)
// We iterate the attributes data only to calculate this DIE's size
for (auto& attribute_spec : abbreviation_info->attribute_specifications) {
m_compilation_unit.dwarf_info().get_attribute_value(attribute_spec.form, attribute_spec.value, stream, &m_compilation_unit);
TRY(m_compilation_unit.dwarf_info().get_attribute_value(attribute_spec.form, attribute_spec.value, stream, &m_compilation_unit));
}
}
m_size = stream.offset() - m_offset;
m_parent_offset = parent_offset;
return {};
}
Optional<AttributeValue> DIE::get_attribute(Attribute const& attribute) const
ErrorOr<Optional<AttributeValue>> DIE::get_attribute(Attribute const& attribute) const
{
InputMemoryStream stream { m_compilation_unit.dwarf_info().debug_info_data() };
stream.discard_or_error(m_data_offset);
@ -55,42 +56,45 @@ Optional<AttributeValue> DIE::get_attribute(Attribute const& attribute) const
VERIFY(abbreviation_info);
for (auto const& attribute_spec : abbreviation_info->attribute_specifications) {
auto value = m_compilation_unit.dwarf_info().get_attribute_value(attribute_spec.form, attribute_spec.value, stream, &m_compilation_unit);
auto value = TRY(m_compilation_unit.dwarf_info().get_attribute_value(attribute_spec.form, attribute_spec.value, stream, &m_compilation_unit));
if (attribute_spec.attribute == attribute) {
return value;
}
}
return {};
return Optional<AttributeValue> {};
}
void DIE::for_each_child(Function<void(DIE const& child)> callback) const
ErrorOr<void> DIE::for_each_child(Function<ErrorOr<void>(DIE const& child)> callback) const
{
if (!m_has_children)
return;
return {};
auto current_child = DIE(m_compilation_unit, m_offset + m_size, m_offset);
while (true) {
callback(current_child);
TRY(callback(current_child));
if (current_child.is_null())
break;
if (!current_child.has_children()) {
current_child.rehydrate_from(current_child.offset() + current_child.size(), m_offset);
TRY(current_child.rehydrate_from(current_child.offset() + current_child.size(), m_offset));
continue;
}
auto sibling = current_child.get_attribute(Attribute::Sibling);
auto sibling = TRY(current_child.get_attribute(Attribute::Sibling));
u32 sibling_offset = 0;
if (sibling.has_value()) {
sibling_offset = sibling.value().as_unsigned();
} else {
// NOTE: According to the spec, the compiler doesn't have to supply the sibling information.
// When it doesn't, we have to recursively iterate the current child's children to find where they end
current_child.for_each_child([&](DIE const& sub_child) {
TRY(current_child.for_each_child([&](DIE const& sub_child) -> ErrorOr<void> {
sibling_offset = sub_child.offset() + sub_child.size();
});
return {};
}));
}
current_child.rehydrate_from(sibling_offset, m_offset);
TRY(current_child.rehydrate_from(sibling_offset, m_offset));
}
return {};
}
}