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//===-- DWARFFormValue.h ----------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef LLDB_SOURCE_PLUGINS_SYMBOLFILE_DWARF_DWARFFORMVALUE_H
#define LLDB_SOURCE_PLUGINS_SYMBOLFILE_DWARF_DWARFFORMVALUE_H
#include "DWARFDataExtractor.h"
#include <cstddef>
#include <optional>
namespace lldb_private::plugin {
namespace dwarf {
class DWARFUnit;
class SymbolFileDWARF;
class DWARFDIE;
class DWARFFormValue {
public:
typedef struct ValueTypeTag {
ValueTypeTag() : value() { value.uval = 0; }
union {
uint64_t uval;
int64_t sval;
const char *cstr;
} value;
const uint8_t *data = nullptr;
} ValueType;
enum {
eValueTypeInvalid = 0,
eValueTypeUnsigned,
eValueTypeSigned,
eValueTypeCStr,
eValueTypeBlock
};
DWARFFormValue() = default;
DWARFFormValue(const DWARFUnit *unit) : m_unit(unit) {}
DWARFFormValue(const DWARFUnit *unit, dw_form_t form)
: m_unit(unit), m_form(form) {}
const DWARFUnit *GetUnit() const { return m_unit; }
void SetUnit(const DWARFUnit *unit) { m_unit = unit; }
dw_form_t Form() const { return m_form; }
dw_form_t &FormRef() { return m_form; }
void SetForm(dw_form_t form) { m_form = form; }
const ValueType &Value() const { return m_value; }
ValueType &ValueRef() { return m_value; }
void SetValue(const ValueType &val) { m_value = val; }
void Dump(Stream &s) const;
bool ExtractValue(const DWARFDataExtractor &data, lldb::offset_t *offset_ptr);
const uint8_t *BlockData() const;
static std::optional<uint8_t> GetFixedSize(dw_form_t form,
const DWARFUnit *u);
std::optional<uint8_t> GetFixedSize() const;
DWARFDIE Reference() const;
/// If this is a reference to another DIE, return the corresponding DWARFUnit
/// and DIE offset such that Unit->GetDIE(offset) produces the desired DIE.
/// Otherwise, a nullptr and unspecified offset are returned.
std::pair<DWARFUnit *, uint64_t> ReferencedUnitAndOffset() const;
uint64_t Reference(dw_offset_t offset) const;
bool Boolean() const { return m_value.value.uval != 0; }
uint64_t Unsigned() const { return m_value.value.uval; }
void SetUnsigned(uint64_t uval) { m_value.value.uval = uval; }
int64_t Signed() const { return m_value.value.sval; }
void SetSigned(int64_t sval) { m_value.value.sval = sval; }
const char *AsCString() const;
dw_addr_t Address() const;
bool IsValid() const { return m_form != 0; }
bool SkipValue(const DWARFDataExtractor &debug_info_data,
lldb::offset_t *offset_ptr) const;
static bool SkipValue(const dw_form_t form,
const DWARFDataExtractor &debug_info_data,
lldb::offset_t *offset_ptr, const DWARFUnit *unit);
static bool IsBlockForm(const dw_form_t form);
static bool IsDataForm(const dw_form_t form);
static int Compare(const DWARFFormValue &a, const DWARFFormValue &b);
void Clear();
static bool FormIsSupported(dw_form_t form);
protected:
// Compile unit where m_value was located.
// It may be different from compile unit where m_value refers to.
const DWARFUnit *m_unit = nullptr; // Unit for this form
dw_form_t m_form = dw_form_t(0); // Form for this value
ValueType m_value; // Contains all data for the form
};
} // namespace dwarf
} // namespace lldb_private::plugin
#endif // LLDB_SOURCE_PLUGINS_SYMBOLFILE_DWARF_DWARFFORMVALUE_H
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