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implement find_global_var to locate variable by name

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This commit is contained in:
Gabriel Ionita 2025-10-25 15:10:00 +01:00
parent 481a5c6cb2
commit 106a620dfc
Signed by: gabi
SSH Key Fingerprint: SHA256:mrbYmB/SGtDvT3etRoS6pDrMYWxR0/B5GSF6rR3qhhc
1 changed files with 67 additions and 0 deletions
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67
src/symbol.cpp
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@ -224,6 +224,73 @@ size_t Symbol::get_var_size(Dwarf_Debug dbg, Dwarf_Die die) {
return byte_size;
}
std::optional<VarInfo> Symbol::find_global_var(Dwarf_Debug dbg, const std::string &var_name) {
Dwarf_Error err;
Dwarf_Unsigned cu_hdr_len, abbr_offset, next_cu_hdr;
Dwarf_Half ver_stamp, addr_sz;
Dwarf_Half length_size, extension_size;
Dwarf_Sig8 type_signature;
Dwarf_Unsigned typeoffset;
Dwarf_Half header_cu_type;
// Iterate through all compilation units
while (dwarf_next_cu_header_d(dbg, true, &cu_hdr_len, &ver_stamp, &abbr_offset,
&addr_sz, &length_size, &extension_size,
&type_signature, &typeoffset, &next_cu_hdr,
&header_cu_type, &err) == DW_DLV_OK) {
Dwarf_Die cu_die = nullptr;
// Get the compilation unit DIE
if (dwarf_siblingof_b(dbg, nullptr, true, &cu_die, &err) != DW_DLV_OK)
continue;
// Get the first child DIE
Dwarf_Die child_die = nullptr;
if (dwarf_child(cu_die, &child_die, &err) != DW_DLV_OK) {
dwarf_dealloc(dbg, cu_die, DW_DLA_DIE);
continue;
}
// Iterate through all child DIEs
while (child_die != nullptr) {
Dwarf_Half tag;
if (dwarf_tag(child_die, &tag, &err) == DW_DLV_OK && tag == DW_TAG_variable) {
char *name = nullptr;
if (dwarf_diename(child_die, &name, &err) == DW_DLV_OK && name) {
if (var_name == name) {
Dwarf_Addr addr = get_global_var_addr(dbg, child_die);
size_t size = get_var_size(dbg, child_die);
VarInfo info{std::string(name), addr, size};
dwarf_dealloc(dbg, name, DW_DLA_STRING);
dwarf_dealloc(dbg, child_die, DW_DLA_DIE);
dwarf_dealloc(dbg, cu_die, DW_DLA_DIE);
return info;
}
dwarf_dealloc(dbg, name, DW_DLA_STRING);
}
}
// Move to the next sibling
Dwarf_Die next_die = nullptr;
int rc = dwarf_siblingof_c(child_die, &next_die, &err);
dwarf_dealloc(dbg, child_die, DW_DLA_DIE);
child_die = next_die;
if (rc != DW_DLV_OK)
break;
}
dwarf_dealloc(dbg, cu_die, DW_DLA_DIE);
}
return std::nullopt;
}
void Symbol::list_global_integer_vars(Dwarf_Debug dbg) {
Dwarf_Error err;
Dwarf_Unsigned cu_hdr_len, abbr_offset, next_cu_hdr;