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Fallback to the cu cache or walking cu's if aranges lookup fails

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This commit is contained in:
Jeremy 2023-12-06 00:17:38 -05:00
parent aa5315769e
commit e8fd01bbe1
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GPG Key ID: BE03111EB7ED6E2E
1 changed files with 78 additions and 66 deletions
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46
src/symbols/symbols_with_libdwarf.cpp
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@ -95,6 +95,7 @@ namespace libdwarf {
std::unordered_map<Dwarf_Off, std::vector<subprogram_entry>> subprograms_cache;
// Vector of ranges and their corresponding CU offsets
std::vector<cu_entry> cu_cache;
bool generated_cu_cache = false;
// Map from CU -> {srcfiles, count}
std::unordered_map<Dwarf_Off, std::pair<char**, Dwarf_Signed>> srcfiles_cache;
@ -165,21 +166,6 @@ namespace libdwarf {
// Check for .debug_aranges for fast lookup
wrap(dwarf_get_aranges, dbg, &aranges, &arange_count);
}
if(ok && !aranges && get_cache_mode() != cache_mode::prioritize_memory) {
walk_compilation_units([this] (const die_object& cu_die) {
Dwarf_Half offset_size = 0;
Dwarf_Half dwversion = 0;
dwarf_get_version_of_die(cu_die.get(), &dwversion, &offset_size);
auto ranges_vec = cu_die.get_rangelist_entries(dwversion);
for(auto range : ranges_vec) {
cu_cache.push_back({ cu_die.clone(), dwversion, range.first, range.second });
}
return true;
});
std::sort(cu_cache.begin(), cu_cache.end(), [] (const cu_entry& a, const cu_entry& b) {
return a.low < b.low;
});
}
}
CPPTRACE_FORCE_NO_INLINE_FOR_PROFILING
@ -213,6 +199,7 @@ namespace libdwarf {
line_contexts(std::move(other.line_contexts)),
subprograms_cache(std::move(other.subprograms_cache)),
cu_cache(std::move(other.cu_cache)),
generated_cu_cache(other.generated_cu_cache),
srcfiles_cache(std::move(other.srcfiles_cache))
{
other.dbg = nullptr;
@ -228,6 +215,7 @@ namespace libdwarf {
line_contexts = std::move(other.line_contexts);
subprograms_cache = std::move(other.subprograms_cache);
cu_cache = std::move(other.cu_cache);
generated_cu_cache = other.generated_cu_cache;
srcfiles_cache = std::move(other.srcfiles_cache);
other.dbg = nullptr;
other.aranges = nullptr;
@ -282,6 +270,25 @@ namespace libdwarf {
}
}
void lazy_generate_cu_cache() {
if(!generated_cu_cache) {
walk_compilation_units([this] (const die_object& cu_die) {
Dwarf_Half offset_size = 0;
Dwarf_Half dwversion = 0;
dwarf_get_version_of_die(cu_die.get(), &dwversion, &offset_size);
auto ranges_vec = cu_die.get_rangelist_entries(dwversion);
for(auto range : ranges_vec) {
cu_cache.push_back({ cu_die.clone(), dwversion, range.first, range.second });
}
return true;
});
std::sort(cu_cache.begin(), cu_cache.end(), [] (const cu_entry& a, const cu_entry& b) {
return a.low < b.low;
});
generated_cu_cache = true;
}
}
std::string subprogram_symbol(
const die_object& die,
Dwarf_Half dwversion
@ -787,8 +794,13 @@ namespace libdwarf {
}
retrieve_line_info(cu_die, pc, frame); // no offset for line info
retrieve_symbol(cu_die, pc, dwversion, frame, inlines);
return;
}
} else {
}
// otherwise, or if not in aranges
// one reason to fallback here is if the compilation has dwarf generated from different compilers and only
// some of them generate aranges (e.g. static linking with cpptrace after specifying clang++ as the c++
// compiler while the C compiler defaults to an older gcc)
if(get_cache_mode() == cache_mode::prioritize_memory) {
// walk for the cu and go from there
walk_compilation_units([this, pc, &frame, &inlines] (const die_object& cu_die) {
@ -818,6 +830,7 @@ namespace libdwarf {
return true;
});
} else {
lazy_generate_cu_cache();
// look up the cu
auto vec_it = std::lower_bound(
cu_cache.begin(),
@ -844,7 +857,6 @@ namespace libdwarf {
}
}
}
}
CPPTRACE_FORCE_NO_INLINE_FOR_PROFILING
frame_with_inlines resolve_frame(const object_frame& frame_info) {