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Handle DW_AT_specification

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This commit is contained in:
Jeremy 2023-09-12 13:03:54 -04:00
parent ffe5fa2524
commit f95b25f0d6
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GPG Key ID: 3E11861CB34E158C
1 changed files with 56 additions and 0 deletions
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56
src/symbols/symbols_with_libdwarf.cpp
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@ -390,6 +390,56 @@ namespace cpptrace {
assert(ret == DW_DLV_OK);
return off;
}
die_object resolve_reference_attribute(Dwarf_Half dw_attrnum) const {
Dwarf_Attribute attr;
int ret = dwarf_attr(die, dw_attrnum, &attr, nullptr);
Dwarf_Half form = 0;
ret = dwarf_whatform(attr, &form, nullptr);
switch(form) {
case DW_FORM_ref1:
case DW_FORM_ref2:
case DW_FORM_ref4:
case DW_FORM_ref8:
case DW_FORM_ref_udata:
{
Dwarf_Off off = 0;
Dwarf_Bool is_info = dwarf_get_die_infotypes_flag(die);
ret = dwarf_formref(attr, &off, &is_info, nullptr);
assert(ret == DW_DLV_OK);
Dwarf_Off goff = 0;
ret = dwarf_convert_to_global_offset(attr, off, &goff, nullptr);
assert(ret == DW_DLV_OK);
Dwarf_Die targ_die_a = 0;
ret = dwarf_offdie_b(dbg, goff, is_info, &targ_die_a, nullptr);
assert(ret == DW_DLV_OK);
return die_object(dbg, targ_die_a);
}
case DW_FORM_ref_addr:
{
Dwarf_Off off;
ret = dwarf_global_formref(attr, &off, nullptr);
int is_info_a = dwarf_get_die_infotypes_flag(die);
Dwarf_Die targ_die_a = 0;
ret = dwarf_offdie_b(dbg, off, is_info_a, &targ_die_a, nullptr);
assert(ret == DW_DLV_OK);
return die_object(dbg, targ_die_a);
}
case DW_FORM_ref_sig8:
{
Dwarf_Sig8 signature;
ret = dwarf_formsig8(attr, &signature, nullptr);
assert(ret == DW_DLV_OK);
Dwarf_Die targdie = 0;
Dwarf_Bool targ_is_info = false;
ret = dwarf_find_die_given_sig8(dbg, &signature, &targdie, &targ_is_info, nullptr);
assert(ret == DW_DLV_OK);
return die_object(dbg, targdie);
}
default:
assert(false);
}
}
};
void walk_die_list(
@ -691,6 +741,12 @@ namespace cpptrace {
}
if(name) {
frame.symbol = std::move(name).unwrap();
} else {
if(die.has_attr(DW_AT_specification)) {
die_object spec = die.resolve_reference_attribute(DW_AT_specification);
// TODO: Passing pc here is misleading
return retrieve_symbol_for_subprogram(dbg, spec, pc, dwversion, frame);
}
}
// TODO: Handle namespaces
// TODO: Disabled for now