99 lines
3.6 KiB
C++
99 lines
3.6 KiB
C++
//===-- DWARFFormValue.h ----------------------------------------*- C++ -*-===//
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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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#ifndef LLDB_SOURCE_PLUGINS_SYMBOLFILE_DWARF_DWARFFORMVALUE_H
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#define LLDB_SOURCE_PLUGINS_SYMBOLFILE_DWARF_DWARFFORMVALUE_H
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#include "DWARFDataExtractor.h"
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#include <cstddef>
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#include <optional>
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namespace lldb_private::plugin {
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namespace dwarf {
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class DWARFUnit;
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class SymbolFileDWARF;
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class DWARFDIE;
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class DWARFFormValue {
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public:
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typedef struct ValueTypeTag {
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ValueTypeTag() : value() { value.uval = 0; }
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union {
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uint64_t uval;
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int64_t sval;
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const char *cstr;
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} value;
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const uint8_t *data = nullptr;
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} ValueType;
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enum {
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eValueTypeInvalid = 0,
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eValueTypeUnsigned,
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eValueTypeSigned,
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eValueTypeCStr,
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eValueTypeBlock
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};
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DWARFFormValue() = default;
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DWARFFormValue(const DWARFUnit *unit) : m_unit(unit) {}
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DWARFFormValue(const DWARFUnit *unit, dw_form_t form)
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: m_unit(unit), m_form(form) {}
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const DWARFUnit *GetUnit() const { return m_unit; }
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void SetUnit(const DWARFUnit *unit) { m_unit = unit; }
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dw_form_t Form() const { return m_form; }
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dw_form_t &FormRef() { return m_form; }
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void SetForm(dw_form_t form) { m_form = form; }
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const ValueType &Value() const { return m_value; }
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ValueType &ValueRef() { return m_value; }
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void SetValue(const ValueType &val) { m_value = val; }
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void Dump(Stream &s) const;
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bool ExtractValue(const DWARFDataExtractor &data, lldb::offset_t *offset_ptr);
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const uint8_t *BlockData() const;
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static std::optional<uint8_t> GetFixedSize(dw_form_t form,
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const DWARFUnit *u);
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std::optional<uint8_t> GetFixedSize() const;
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DWARFDIE Reference() const;
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/// If this is a reference to another DIE, return the corresponding DWARFUnit
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/// and DIE offset such that Unit->GetDIE(offset) produces the desired DIE.
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/// Otherwise, a nullptr and unspecified offset are returned.
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std::pair<DWARFUnit *, uint64_t> ReferencedUnitAndOffset() const;
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uint64_t Reference(dw_offset_t offset) const;
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bool Boolean() const { return m_value.value.uval != 0; }
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uint64_t Unsigned() const { return m_value.value.uval; }
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void SetUnsigned(uint64_t uval) { m_value.value.uval = uval; }
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int64_t Signed() const { return m_value.value.sval; }
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void SetSigned(int64_t sval) { m_value.value.sval = sval; }
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const char *AsCString() const;
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dw_addr_t Address() const;
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bool IsValid() const { return m_form != 0; }
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bool SkipValue(const DWARFDataExtractor &debug_info_data,
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lldb::offset_t *offset_ptr) const;
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static bool SkipValue(const dw_form_t form,
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const DWARFDataExtractor &debug_info_data,
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lldb::offset_t *offset_ptr, const DWARFUnit *unit);
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static bool IsBlockForm(const dw_form_t form);
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static bool IsDataForm(const dw_form_t form);
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static int Compare(const DWARFFormValue &a, const DWARFFormValue &b);
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void Clear();
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static bool FormIsSupported(dw_form_t form);
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protected:
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// Compile unit where m_value was located.
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// It may be different from compile unit where m_value refers to.
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const DWARFUnit *m_unit = nullptr; // Unit for this form
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dw_form_t m_form = dw_form_t(0); // Form for this value
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ValueType m_value; // Contains all data for the form
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};
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} // namespace dwarf
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} // namespace lldb_private::plugin
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#endif // LLDB_SOURCE_PLUGINS_SYMBOLFILE_DWARF_DWARFFORMVALUE_H
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