ac53569bd1
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.
113 lines
3.5 KiB
C++
113 lines
3.5 KiB
C++
/*
|
|
* Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include "CompilationUnit.h"
|
|
#include "DIE.h"
|
|
|
|
namespace Debug::Dwarf {
|
|
|
|
CompilationUnit::CompilationUnit(DwarfInfo const& dwarf_info, u32 offset, CompilationUnitHeader const& header, NonnullOwnPtr<LineProgram>&& line_program)
|
|
: m_dwarf_info(dwarf_info)
|
|
, m_offset(offset)
|
|
, m_header(header)
|
|
, m_abbreviations(dwarf_info, header.abbrev_offset())
|
|
, m_line_program(move(line_program))
|
|
{
|
|
VERIFY(header.version() < 5 || header.unit_type() == CompilationUnitType::Full);
|
|
}
|
|
|
|
DIE CompilationUnit::root_die() const
|
|
{
|
|
return DIE(*this, m_offset + m_header.header_size());
|
|
}
|
|
|
|
DIE CompilationUnit::get_die_at_offset(u32 die_offset) const
|
|
{
|
|
VERIFY(die_offset >= offset() && die_offset < offset() + size());
|
|
return DIE(*this, die_offset);
|
|
}
|
|
|
|
Optional<FlatPtr> CompilationUnit::base_address() const
|
|
{
|
|
if (m_has_cached_base_address)
|
|
return m_cached_base_address;
|
|
|
|
auto die = root_die();
|
|
auto res = die.get_attribute(Attribute::LowPc);
|
|
if (res.has_value()) {
|
|
m_cached_base_address = res->as_addr();
|
|
}
|
|
m_has_cached_base_address = true;
|
|
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));
|
|
}
|
|
}
|