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Support .debug_aranges for CU lookups

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This commit is contained in:
Jeremy 2023-09-17 14:41:10 -04:00
parent 2c4f271e23
commit 5fcfb34335
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GPG Key ID: 19AA8270105E8EB4
1 changed files with 36 additions and 1 deletions
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37
src/symbols/symbols_with_libdwarf.cpp
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@ -422,6 +422,16 @@ namespace libdwarf {
}
return false;
}
void print() const {
fprintf(
stderr,
"%08llx %s %s\n",
(unsigned long long) get_global_offset(),
get_tag_name(),
get_name().c_str()
);
}
};
bool is_mangled_name(const std::string& name) {
@ -811,7 +821,32 @@ namespace libdwarf {
fprintf(stderr, "%s\n", obj_path.c_str());
fprintf(stderr, "%llx\n", pc);
}
walk_dbg(pc, frame);
// Check for .debug_aranges for fast lookup
Dwarf_Arange *aranges;
Dwarf_Signed arange_count;
if(dwarf_get_aranges(dbg, &aranges, &arange_count, nullptr) == DW_DLV_OK) {
// Try to find pc in aranges
Dwarf_Arange arange;
if(dwarf_get_arange(aranges, arange_count, pc, &arange, nullptr) == DW_DLV_OK) {
// Address in table, load CU die
Dwarf_Off cu_die_offset;
CPPTRACE_VERIFY(dwarf_get_cu_die_offset(arange, &cu_die_offset, nullptr) == DW_DLV_OK);
Dwarf_Die raw_die;
// Setting is_info = true for now, assuming in .debug_info rather than .debug_types
CPPTRACE_VERIFY(dwarf_offdie_b(dbg, cu_die_offset, true, &raw_die, nullptr) == DW_DLV_OK);
die_object die(dbg, raw_die);
if(trace_dwarf) {
fprintf(stderr, "Found CU in aranges\n");
die.print();
}
retrieve_line_info(die, pc, 5, frame); // no offset for line info
retrieve_symbol(die, pc, 5, frame);
dwarf_dealloc(dbg, arange, DW_DLA_ARANGE);
}
dwarf_dealloc(dbg, aranges, DW_DLA_LIST);
} else {
walk_dbg(pc, frame);
}
}
CPPTRACE_FORCE_NO_INLINE