96 lines · c
1//===-- DWARFFormValue.h ----------------------------------------*- C++ -*-===//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-exception6//7//===----------------------------------------------------------------------===//8 9#ifndef LLDB_SOURCE_PLUGINS_SYMBOLFILE_DWARF_DWARFFORMVALUE_H10#define LLDB_SOURCE_PLUGINS_SYMBOLFILE_DWARF_DWARFFORMVALUE_H11 12#include "DWARFDataExtractor.h"13#include "llvm/DebugInfo/DWARF/DWARFFormValue.h"14#include <optional>15 16namespace lldb_private::plugin {17namespace dwarf {18class DWARFUnit;19class SymbolFileDWARF;20class DWARFDIE;21 22class DWARFFormValue {23public:24 typedef llvm::DWARFFormValue::ValueType ValueType;25 enum {26 eValueTypeInvalid = 0,27 eValueTypeUnsigned,28 eValueTypeSigned,29 eValueTypeCStr,30 eValueTypeBlock31 };32 33 DWARFFormValue() = default;34 DWARFFormValue(const DWARFUnit *unit) : m_unit(unit) {}35 DWARFFormValue(const DWARFUnit *unit, dw_form_t form)36 : m_unit(unit), m_form(form) {}37 const DWARFUnit *GetUnit() const { return m_unit; }38 void SetUnit(const DWARFUnit *unit) { m_unit = unit; }39 dw_form_t Form() const { return m_form; }40 dw_form_t &FormRef() { return m_form; }41 void SetForm(dw_form_t form) { m_form = form; }42 const ValueType &Value() const { return m_value; }43 ValueType &ValueRef() { return m_value; }44 void SetValue(const ValueType &val) { m_value = val; }45 46 void Dump(Stream &s) const;47 bool ExtractValue(const DWARFDataExtractor &data, lldb::offset_t *offset_ptr);48 const uint8_t *BlockData() const;49 static std::optional<uint8_t> GetFixedSize(dw_form_t form,50 const DWARFUnit *u);51 std::optional<uint8_t> GetFixedSize() const;52 DWARFDIE Reference() const;53 54 /// If this is a reference to another DIE, return the corresponding DWARFUnit55 /// and DIE offset such that Unit->GetDIE(offset) produces the desired DIE.56 /// Otherwise, a nullptr and unspecified offset are returned.57 std::pair<DWARFUnit *, uint64_t> ReferencedUnitAndOffset() const;58 59 uint64_t Reference(dw_offset_t offset) const;60 bool Boolean() const { return m_value.uval != 0; }61 uint64_t Unsigned() const { return m_value.uval; }62 void SetUnsigned(uint64_t uval) { m_value.uval = uval; }63 int64_t Signed() const { return m_value.sval; }64 void SetSigned(int64_t sval) { m_value.sval = sval; }65 const char *AsCString() const;66 dw_addr_t Address() const;67 bool IsValid() const { return m_form != 0; }68 bool SkipValue(const DWARFDataExtractor &debug_info_data,69 lldb::offset_t *offset_ptr) const;70 static bool SkipValue(const dw_form_t form,71 const DWARFDataExtractor &debug_info_data,72 lldb::offset_t *offset_ptr, const DWARFUnit *unit);73 static bool IsBlockForm(const dw_form_t form);74 static bool IsDataForm(const dw_form_t form);75 static int Compare(const DWARFFormValue &a, const DWARFFormValue &b);76 void Clear();77 static bool FormIsSupported(dw_form_t form);78 79 // The following methods use LLVM naming convension in order to be are used by80 // LLVM libraries.81 std::optional<uint64_t> getAsUnsignedConstant() const;82 std::optional<int64_t> getAsSignedConstant() const;83 const char *getAsCString() const { return AsCString(); }84 85protected:86 // Compile unit where m_value was located.87 // It may be different from compile unit where m_value refers to.88 const DWARFUnit *m_unit = nullptr; // Unit for this form89 dw_form_t m_form = dw_form_t(0); // Form for this value90 ValueType m_value; // Contains all data for the form91};92} // namespace dwarf93} // namespace lldb_private::plugin94 95#endif // LLDB_SOURCE_PLUGINS_SYMBOLFILE_DWARF_DWARFFORMVALUE_H96