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/*
* Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "CompilationUnit.h"
#include "DwarfTypes.h"
#include <AK/Function.h>
#include <AK/NonnullOwnPtr.h>
#include <AK/Optional.h>
#include <AK/Types.h>
namespace Dwarf {
class CompilationUnit;
// DIE = Debugging Information Entry
class DIE {
public:
DIE(const CompilationUnit&, u32 offset);
struct AttributeValue {
enum class Type {
UnsignedNumber,
SignedNumber,
String,
DieReference, // Reference to another DIE in the same compilation unit
Boolean,
DwarfExpression,
SecOffset,
RawBytes,
} type;
union {
u32 as_u32;
i32 as_i32;
const char* as_string; // points to bytes in the memory mapped elf image
bool as_bool;
struct {
u32 length;
const u8* bytes; // points to bytes in the memory mapped elf image
} as_raw_bytes;
} data {};
};
u32 offset() const { return m_offset; }
u32 size() const { return m_size; }
bool has_children() const { return m_has_children; }
EntryTag tag() const { return m_tag; }
Optional<AttributeValue> get_attribute(const Attribute&) const;
void for_each_child(Function<void(const DIE& child)> callback) const;
bool is_null() const { return m_tag == EntryTag::None; }
DIE get_die_at_offset(u32 offset) const;
private:
AttributeValue get_attribute_value(AttributeDataForm form,
InputMemoryStream& debug_info_stream) const;
const CompilationUnit& m_compilation_unit;
u32 m_offset { 0 };
u32 m_data_offset { 0 };
size_t m_abbreviation_code { 0 };
EntryTag m_tag { EntryTag::None };
bool m_has_children { false };
u32 m_size { 0 };
};
}
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