bool
DWARFFormValue::SkipValue(dw_form_t form, const DataExtractor& debug_info_data, lldb::offset_t *offset_ptr, const DWARFCompileUnit* cu)
{
switch (form)
{
// Blocks if inlined data that have a length field and the data bytes
// inlined in the .debug_info
case DW_FORM_exprloc:
case DW_FORM_block: { dw_uleb128_t size = debug_info_data.GetULEB128(offset_ptr); *offset_ptr += size; } return true;
case DW_FORM_block1: { dw_uleb128_t size = debug_info_data.GetU8(offset_ptr); *offset_ptr += size; } return true;
case DW_FORM_block2: { dw_uleb128_t size = debug_info_data.GetU16(offset_ptr); *offset_ptr += size; } return true;
case DW_FORM_block4: { dw_uleb128_t size = debug_info_data.GetU32(offset_ptr); *offset_ptr += size; } return true;
// Inlined NULL terminated C-strings
case DW_FORM_string:
debug_info_data.GetCStr(offset_ptr);
return true;
// Compile unit address sized values
case DW_FORM_addr:
*offset_ptr += DWARFCompileUnit::GetAddressByteSize(cu);
return true;
case DW_FORM_ref_addr:
if (cu->GetVersion() <= 2)
*offset_ptr += DWARFCompileUnit::GetAddressByteSize(cu);
else
*offset_ptr += 4;// 4 for DWARF32, 8 for DWARF64, but we don't support DWARF64 yet
return true;
// 0 bytes values (implied from DW_FORM)
case DW_FORM_flag_present:
return true;
// 1 byte values
case DW_FORM_data1:
case DW_FORM_flag:
case DW_FORM_ref1:
*offset_ptr += 1;
return true;
// 2 byte values
case DW_FORM_data2:
case DW_FORM_ref2:
*offset_ptr += 2;
return true;
// 32 bit for DWARF 32, 64 for DWARF 64
case DW_FORM_sec_offset:
*offset_ptr += 4;
return true;
// 4 byte values
case DW_FORM_strp:
case DW_FORM_data4:
case DW_FORM_ref4:
*offset_ptr += 4;
return true;
// 8 byte values
case DW_FORM_data8:
case DW_FORM_ref8:
case DW_FORM_ref_sig8:
*offset_ptr += 8;
return true;
// signed or unsigned LEB 128 values
case DW_FORM_sdata:
case DW_FORM_udata:
case DW_FORM_ref_udata:
debug_info_data.Skip_LEB128(offset_ptr);
return true;
case DW_FORM_indirect:
{
dw_form_t indirect_form = debug_info_data.GetULEB128(offset_ptr);
return DWARFFormValue::SkipValue (indirect_form,
debug_info_data,
offset_ptr,
cu);
}
default:
break;
}
return false;
}
