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LibDebug: Use DW_AT_ranges to get address ranges of DIEs

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Previously, we only supported DIEs with a contiguous address ranges and
ignored ones with a non-contiguous set of ranges.

We now check if a DIE has the DW_AT_ranges attribute, and if it does we
parse its range list.

This improves the quality of our backtraces - we previously missed many
inlined function calls because their DIEs had non-contigues address
ranges.
This commit is contained in:
Itamar 2021-09-28 13:35:28 +03:00 • committed by Andreas Kling
parent 26a96d315d
commit 09153b8997
2 changed files with 18 additions and 2 deletions
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18
Userland/Libraries/LibDebug/Dwarf/DwarfInfo.cpp
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@ -5,6 +5,7 @@
*/
#include "DwarfInfo.h"
#include "AddressRanges.h"
#include "AttributeValue.h"
#include "CompilationUnit.h"
@ -21,6 +22,7 @@ DwarfInfo::DwarfInfo(ELF::Image const& elf)
m_debug_strings_data = section_data(".debug_str"sv);
m_debug_line_data = section_data(".debug_line"sv);
m_debug_line_strings_data = section_data(".debug_line_str"sv);
m_debug_range_lists_data = section_data(".debug_rnglists"sv);
populate_compilation_units();
}
@ -241,8 +243,20 @@ void DwarfInfo::build_cached_dies() const
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 = [](DIE const& die) -> Vector<DIERange> {
// TODO support DW_AT_ranges (appears when range is non-contiguous)
auto get_ranges_of_die = [this](DIE const& die) -> Vector<DIERange> {
auto ranges = die.get_attribute(Attribute::Ranges);
if (ranges.has_value()) {
// TODO Support DW_FORM_rnglistx
if (ranges->form != AttributeDataForm::SecOffset)
return {};
auto offset = ranges->data.as_addr;
AddressRanges address_ranges(debug_range_lists_data(), offset, die.compilation_unit());
Vector<DIERange> entries;
address_ranges.for_each_range([&entries](auto range) {
entries.empend(range.start, range.end);
});
return entries;
}
auto start = die.get_attribute(Attribute::LowPc);
auto end = die.get_attribute(Attribute::HighPc);