56 lines
2.1 KiB
C++
56 lines
2.1 KiB
C++
//===-- DIERef.cpp --------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "DIERef.h"
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#include "lldb/Utility/DataEncoder.h"
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#include "lldb/Utility/DataExtractor.h"
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#include "llvm/Support/Format.h"
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using namespace lldb;
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using namespace lldb_private;
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void llvm::format_provider<DIERef>::format(const DIERef &ref, raw_ostream &OS,
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StringRef Style) {
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if (ref.dwo_num())
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OS << format_hex_no_prefix(*ref.dwo_num(), 8) << "/";
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OS << (ref.section() == DIERef::DebugInfo ? "INFO" : "TYPE");
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OS << "/" << format_hex_no_prefix(ref.die_offset(), 8);
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}
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constexpr uint32_t k_dwo_num_mask = 0x3FFFFFFF;
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constexpr uint32_t k_dwo_num_valid_bitmask = (1u << 30);
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constexpr uint32_t k_section_bitmask = (1u << 31);
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llvm::Optional<DIERef> DIERef::Decode(const DataExtractor &data,
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lldb::offset_t *offset_ptr) {
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const uint32_t bitfield_storage = data.GetU32(offset_ptr);
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uint32_t dwo_num = bitfield_storage & k_dwo_num_mask;
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bool dwo_num_valid = (bitfield_storage & (k_dwo_num_valid_bitmask)) != 0;
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Section section = (Section)((bitfield_storage & (k_section_bitmask)) != 0);
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// DIE offsets can't be zero and if we fail to decode something from data,
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// it will return 0
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dw_offset_t die_offset = data.GetU32(offset_ptr);
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if (die_offset == 0)
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return std::nullopt;
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if (dwo_num_valid)
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return DIERef(dwo_num, section, die_offset);
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else
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return DIERef(std::nullopt, section, die_offset);
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}
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void DIERef::Encode(DataEncoder &encoder) const {
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uint32_t bitfield_storage = m_dwo_num;
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if (m_dwo_num_valid)
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bitfield_storage |= k_dwo_num_valid_bitmask;
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if (m_section)
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bitfield_storage |= k_section_bitmask;
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encoder.AppendU32(bitfield_storage);
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static_assert(sizeof(m_die_offset) == 4, "m_die_offset must be 4 bytes");
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encoder.AppendU32(m_die_offset);
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}
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