mirror of
https://github.com/RGBCube/serenity
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395313039d
The same file path occurs over and over in debug info, so let's store them as FlyString to ensure we only have one of each in memory.
119 lines
3.3 KiB
C++
119 lines
3.3 KiB
C++
/*
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* Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/FlyString.h>
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#include <AK/MemoryStream.h>
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#include <AK/Vector.h>
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namespace Debug::Dwarf {
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class LineProgram {
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public:
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explicit LineProgram(InputMemoryStream& stream);
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struct LineInfo {
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u32 address { 0 };
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FlyString file;
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size_t line { 0 };
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};
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const Vector<LineInfo>& lines() const { return m_lines; }
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private:
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void parse_unit_header();
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void parse_source_directories();
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void parse_source_files();
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void run_program();
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void append_to_line_info();
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void reset_registers();
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void handle_extended_opcode();
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void handle_standard_opcode(u8 opcode);
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void handle_sepcial_opcode(u8 opcode);
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struct [[gnu::packed]] UnitHeader32
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{
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u32 length;
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u16 version;
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u32 header_length;
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u8 min_instruction_length;
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u8 default_is_stmt;
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i8 line_base;
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u8 line_range;
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u8 opcode_base;
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u8 std_opcode_lengths[12];
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};
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enum StandardOpcodes {
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Copy = 1,
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AdvancePc,
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AdvanceLine,
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SetFile,
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SetColumn,
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NegateStatement,
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SetBasicBlock,
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ConstAddPc,
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FixAdvancePc,
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SetProlougeEnd,
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SetEpilogueBegin,
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SetIsa
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};
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enum ExtendedOpcodes {
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EndSequence = 1,
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SetAddress,
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DefineFile,
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SetDiscriminator,
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};
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struct FileEntry {
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FlyString name;
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size_t directory_index { 0 };
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};
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static constexpr u16 DWARF_VERSION = 3;
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static constexpr u8 SPECIAL_OPCODES_BASE = 13;
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InputMemoryStream& m_stream;
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size_t m_unit_offset { 0 };
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UnitHeader32 m_unit_header {};
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Vector<String> m_source_directories;
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Vector<FileEntry> m_source_files;
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// The registers of the "line program" virtual machine
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u32 m_address { 0 };
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size_t m_line { 0 };
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size_t m_file_index { 0 };
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bool m_is_statement { false };
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Vector<LineInfo> m_lines;
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};
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}
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