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/*
* Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include "DwarfInfo.h"
#include <AK/FlyString.h>
#include <AK/MemoryStream.h>
#include <AK/Vector.h>
namespace Debug::Dwarf {
struct [[gnu::packed]] LineProgramUnitHeader32Common {
u32 length;
u16 version;
};
struct [[gnu::packed]] LineProgramUnitHeader32V4Ext {
u32 header_length;
u8 min_instruction_length;
u8 max_instruction_length;
u8 default_is_stmt;
i8 line_base;
u8 line_range;
u8 opcode_base;
};
struct [[gnu::packed]] LineProgramUnitHeader32V5Ext {
u8 address_size;
u8 segment_selector_size;
u32 header_length;
u8 min_instruction_length;
u8 max_instruction_length;
u8 default_is_stmt;
i8 line_base;
u8 line_range;
u8 opcode_base;
};
struct [[gnu::packed]] LineProgramUnitHeader32 {
LineProgramUnitHeader32Common common;
union {
LineProgramUnitHeader32V4Ext v4;
LineProgramUnitHeader32V5Ext v5;
};
u8 std_opcode_lengths[13];
size_t header_size() const
{
return sizeof(common) + ((common.version <= 4) ? sizeof(v4) : sizeof(v5)) + (opcode_base() - 1) * sizeof(std_opcode_lengths[0]);
}
u32 length() const { return common.length; }
u16 version() const { return common.version; }
u32 header_length() const { return (common.version <= 4) ? v4.header_length : v5.header_length; }
u8 min_instruction_length() const { return (common.version <= 4) ? v4.min_instruction_length : v5.min_instruction_length; }
u8 default_is_stmt() const { return (common.version <= 4) ? v4.default_is_stmt : v5.default_is_stmt; }
i8 line_base() const { return (common.version <= 4) ? v4.line_base : v5.line_base; }
u8 line_range() const { return (common.version <= 4) ? v4.line_range : v5.line_range; }
u8 opcode_base() const { return (common.version <= 4) ? v4.opcode_base : v5.opcode_base; }
};
enum class ContentType {
Path = 1,
DirectoryIndex = 2,
Timestamp = 3,
Size = 4,
MD5 = 5,
LoUser = 0x2000,
HiUser = 0x3fff,
};
struct PathEntryFormat {
ContentType type;
AttributeDataForm form;
};
struct PathEntry {
String path;
size_t directory_index { 0 };
};
enum class PathListType {
Directories,
Filenames,
};
inline InputStream& operator>>(InputStream& stream, LineProgramUnitHeader32& header)
{
stream.read_or_error(Bytes { &header.common, sizeof(header.common) });
if (header.common.version <= 4)
stream.read_or_error(Bytes { &header.v4, sizeof(header.v4) });
else
stream.read_or_error(Bytes { &header.v5, sizeof(header.v5) });
stream.read_or_error(Bytes { &header.std_opcode_lengths, min(sizeof(header.std_opcode_lengths), (header.opcode_base() - 1) * sizeof(header.std_opcode_lengths[0])) });
return stream;
}
class LineProgram {
AK_MAKE_NONCOPYABLE(LineProgram);
AK_MAKE_NONMOVABLE(LineProgram);
public:
explicit LineProgram(DwarfInfo& dwarf_info, InputMemoryStream& stream);
struct LineInfo {
FlatPtr address { 0 };
FlyString file;
size_t line { 0 };
};
Vector<LineInfo> const& lines() const { return m_lines; }
struct DirectoryAndFile {
FlyString directory;
FlyString filename;
};
DirectoryAndFile get_directory_and_file(size_t file_index) const;
private:
void parse_unit_header();
void parse_source_directories();
void parse_source_files();
void run_program();
void append_to_line_info();
void reset_registers();
void handle_extended_opcode();
void handle_standard_opcode(u8 opcode);
void handle_special_opcode(u8 opcode);
void parse_path_entries(Function<void(PathEntry& entry)> callback, PathListType list_type);
enum StandardOpcodes {
Copy = 1,
AdvancePc,
AdvanceLine,
SetFile,
SetColumn,
NegateStatement,
SetBasicBlock,
ConstAddPc,
FixAdvancePc,
SetProlougeEnd,
SetEpilogueBegin,
SetIsa
};
enum ExtendedOpcodes {
EndSequence = 1,
SetAddress,
DefineFile,
SetDiscriminator,
};
struct FileEntry {
FlyString name;
size_t directory_index { 0 };
};
static constexpr u16 MIN_DWARF_VERSION = 3;
static constexpr u16 MAX_DWARF_VERSION = 5;
DwarfInfo& m_dwarf_info;
InputMemoryStream& m_stream;
size_t m_unit_offset { 0 };
LineProgramUnitHeader32 m_unit_header {};
Vector<String> m_source_directories;
Vector<FileEntry> m_source_files;
// The registers of the "line program" virtual machine
FlatPtr m_address { 0 };
size_t m_line { 0 };
size_t m_file_index { 0 };
bool m_is_statement { false };
bool m_basic_block { false };
Vector<LineInfo> m_lines;
};
}
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