1 //===-- DIERef.cpp --------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "DIERef.h" 10 #include "lldb/Utility/DataEncoder.h" 11 #include "lldb/Utility/DataExtractor.h" 12 #include "llvm/Support/Format.h" 13 #include <optional> 14 15 using namespace lldb; 16 using namespace lldb_private; 17 using namespace lldb_private::plugin::dwarf; 18 19 void llvm::format_provider<DIERef>::format(const DIERef &ref, raw_ostream &OS, 20 StringRef Style) { 21 if (ref.file_index()) 22 OS << format_hex_no_prefix(*ref.file_index(), 8) << "/"; 23 OS << (ref.section() == DIERef::DebugInfo ? "INFO" : "TYPE"); 24 OS << "/" << format_hex_no_prefix(ref.die_offset(), 8); 25 } 26 27 std::optional<DIERef> DIERef::Decode(const DataExtractor &data, 28 lldb::offset_t *offset_ptr) { 29 DIERef die_ref(data.GetU64(offset_ptr)); 30 31 // DIE offsets can't be zero and if we fail to decode something from data, 32 // it will return 0 33 if (!die_ref.die_offset()) 34 return std::nullopt; 35 36 return die_ref; 37 } 38 39 void DIERef::Encode(DataEncoder &encoder) const { encoder.AppendU64(get_id()); } 40