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LibDebug: Support addrx*, strx* and rnglistx forms

Browse source 
These forms were introduced in DWARF5, and have a fair deal of
advantages over the more traditional encodings: they reduce the size of
the binary and the number of relocations.

GCC does not emit these with `-g1` by default, but Clang does at all
debug levels.
This commit is contained in:
Daniel Bertalan 2021-10-09 17:38:26 +02:00 • committed by Linus Groh
parent 8e5b70a0ba
commit ac53569bd1
7 changed files with 213 additions and 3 deletions
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66
Userland/Libraries/LibDebug/Dwarf/CompilationUnit.cpp
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@ -44,4 +44,70 @@ Optional<FlatPtr> CompilationUnit::base_address() const
return m_cached_base_address;
}
u64 CompilationUnit::address_table_base() const
{
if (m_has_cached_address_table_base)
return m_cached_address_table_base;
auto die = root_die();
auto res = die.get_attribute(Attribute::AddrBase);
if (res.has_value()) {
VERIFY(res->form() == AttributeDataForm::SecOffset);
m_cached_address_table_base = res->as_unsigned();
}
m_has_cached_address_table_base = true;
return m_cached_address_table_base;
}
u64 CompilationUnit::string_offsets_base() const
{
if (m_has_cached_string_offsets_base)
return m_cached_string_offsets_base;
auto die = root_die();
auto res = die.get_attribute(Attribute::StrOffsetsBase);
if (res.has_value()) {
VERIFY(res->form() == AttributeDataForm::SecOffset);
m_cached_string_offsets_base = res->as_unsigned();
}
m_has_cached_string_offsets_base = true;
return m_cached_string_offsets_base;
}
u64 CompilationUnit::range_lists_base() const
{
if (m_has_cached_range_lists_base)
return m_cached_range_lists_base;
auto die = root_die();
auto res = die.get_attribute(Attribute::RngListsBase);
if (res.has_value()) {
VERIFY(res->form() == AttributeDataForm::SecOffset);
m_cached_range_lists_base = res->as_unsigned();
}
m_has_cached_range_lists_base = true;
return m_cached_range_lists_base;
}
FlatPtr CompilationUnit::get_address(size_t index) const
{
auto base = address_table_base();
auto debug_addr_data = dwarf_info().debug_addr_data();
VERIFY(base < debug_addr_data.size());
auto addresses = reinterpret_cast<FlatPtr const*>(debug_addr_data.offset(base));
VERIFY(base + index * sizeof(FlatPtr) < debug_addr_data.size());
return addresses[index];
}
char const* CompilationUnit::get_string(size_t index) const
{
auto base = string_offsets_base();
auto debug_str_offsets_data = dwarf_info().debug_str_offsets_data();
VERIFY(base < debug_str_offsets_data.size());
// FIXME: This assumes DWARF32
auto offsets = reinterpret_cast<u32 const*>(debug_str_offsets_data.offset(base));
VERIFY(base + index * sizeof(u32) < debug_str_offsets_data.size());
auto offset = offsets[index];
return reinterpret_cast<char const*>(dwarf_info().debug_strings_data().offset(offset));
}
}