belka/elna
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Create a minimal interactive shell

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This commit is contained in:
Eugen Wissner 2024-02-22 21:29:25 +01:00
parent 86d579e8d5
commit ad29dbdc14
Signed by: belka
GPG Key ID: A27FDC1E8EE902C0
43 changed files with 1192 additions and 3264 deletions
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5
.gitignore vendored
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@ -1,3 +1,4 @@
/.dub/
/dub.selections.json
/build/
.cache/
CMakeFiles/
CMakeCache.txt

18
CMakeLists.txt
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@ -1,5 +1,21 @@
cmake_minimum_required(VERSION 3.21)
project(Elna)
set(CMAKE_EXPORT_COMPILE_COMMANDS 1)
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
add_executable(tester tests/runner.cpp)
find_package(Boost COMPONENTS filesystem REQUIRED)
add_executable(tester tests/runner.cpp include/elna/tester.hpp)
target_include_directories(tester PRIVATE include)
add_executable(elnsh shell/main.cpp
shell/interactive.cpp include/elna/interactive.hpp
shell/history.cpp include/elna/history.hpp
shell/state.cpp include/elna/state.hpp
shell/lexer.cpp include/elna/lexer.hpp
shell/result.cpp include/elna/result.hpp)
target_include_directories(elnsh PRIVATE include)
target_link_libraries(elnsh PUBLIC
${Boost_FILESYSTEM_LIBRARY}
)

45
README
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# Elna programming language
Elna compiles simple mathematical operations to machine code.
The compiled program returns the result of the operation.
## File extension
.elna
## Grammar PL/0
program = block "." ;
block = [ "const" ident "=" number {"," ident "=" number} ";"]
[ "var" ident {"," ident} ";"]
{ "procedure" ident ";" block ";" } statement ;
statement = [ ident ":=" expression | "call" ident
| "?" ident | "!" expression
| "begin" statement {";" statement } "end"
| "if" condition "then" statement
| "while" condition "do" statement ];
condition = "odd" expression |
expression ("="|"#"|"<"|"<="|">"|">=") expression ;
expression = [ "+"|"-"] term { ("+"|"-") term};
term = factor {("*"|"/") factor};
factor = ident | number | "(" expression ")";
## Operations
"!" - Write a line.
"?" - Read user input.
"odd" - The only function, returns whether a number is odd.
# Build and test
```sh
cmake -B build
make -C build
./build/bin/tester
```

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Rakefile
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require 'pathname'
require 'rake/clean'
require 'open3'
DFLAGS = ['--warn-no-deprecated', '-L/usr/lib64/gcc-12']
BINARY = 'build/bin/elna'
TESTS = FileList['tests/*.eln'].flat_map do |test|
build = Pathname.new 'build'
test_basename = Pathname.new(test).basename('')
[build + 'riscv' + test_basename].map { |path| path.sub_ext('').to_path }
end
SOURCES = FileList['source/**/*.d']
directory 'build'
CLEAN.include 'build'
CLEAN.include '.dub'
rule(/build\/riscv\/[^\/\.]+$/ => ->(file) { test_for_out(file, '.o') }) do |t|
sh '/opt/riscv/bin/riscv32-unknown-elf-ld',
'-o', t.name,
'-L/opt/riscv/lib/gcc/riscv32-unknown-elf/13.2.0/',
'-L/opt/riscv/riscv32-unknown-elf/lib',
'/opt/riscv/riscv32-unknown-elf/lib/crt0.o',
'/opt/riscv/lib/gcc/riscv32-unknown-elf/13.2.0/crtbegin.o',
t.source,
'--start-group', '-lgcc', '-lc', '-lgloss', '--end-group',
'/opt/riscv/lib/gcc/riscv32-unknown-elf/13.2.0/crtend.o'
end
rule(/build\/riscv\/.+\.o$/ => ->(file) { test_for_object(file, '.eln') }) do |t|
Pathname.new(t.name).dirname.mkpath
sh BINARY, '-o', t.name, t.source
end
file BINARY => SOURCES do |t|
sh({ 'DFLAGS' => (DFLAGS * ' ') }, 'dub', 'build', '--compiler=gdc')
end
task default: TESTS
task default: BINARY
desc 'Run unittest blocks'
task unittest: SOURCES do |t|
sh('dub', 'test', '--compiler=gdc-12')
end
def test_for_object(out_file, extension)
test_source = Pathname
.new(out_file)
.sub_ext(extension)
.sub(/^build\/[[:alpha:]]+\//, 'tests/')
.to_path
[test_source, BINARY]
end
def test_for_out(out_file, extension)
Pathname
.new(out_file)
.sub_ext(extension)
.to_path
end

23
TODO
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- Mark all classes as extern(C++) to interface with C++.
- Some nodes assert(false, "Not implemented") because their logic is handled
in the parent nodes. Move this logic to the nodes themselves.
- Implement multiplication and division.
- Split tester.cpp into a header and implementation files.
- The generate function in backend.d contains the whole compilation logic.
It's not a backend task.
- Output assembly.
- After inserting autocompletion move the cursor to the end of the insertion.
- Support multiple selections for insertion in fzf.
- Vi mode.
- Don't hardcode fzf binary path.
- Persist the history.
- Send the word under the cursor to fzf as initial input.
- Replace hard coded ANSI codes with constants or functions.
- Show the hostname in the prompt.
- Crash if the cd directory doesn't exist.
- Home directory expansion.
- Paste pastes only the first character.
- When we read the key and an error occures how it should be handled?
- Kitty protocol works with UTF8 code points for escape sequences with modifiers.
They can be wider than an unsigned char.
- Add a bar with additional information under the prompt (edit_bar).

9
dub.json
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{
"dependencies": {
"tanya": "~>0.19.0"
},
"name": "elna",
"targetType": "executable",
"targetPath": "build/bin",
"mainSourceFile": "source/main.d"
}

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include/elna/history.hpp Normal file
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#pragma once
#include <boost/core/noncopyable.hpp>
#include <string>
#include <list>
namespace elna
{
struct editor_history : public boost::noncopyable
{
using const_iterator = std::list<std::string>::const_iterator;
editor_history();
void push(const std::string& entry);
void clear();
const_iterator next() noexcept;
const_iterator prev() noexcept;
const_iterator cbegin() const noexcept;
const_iterator cend() const noexcept;
const_iterator current() const noexcept;
private:
std::list<std::string> commands;
std::list<std::string>::const_iterator current_pointer;
};
}

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include/elna/interactive.hpp Normal file
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#pragma once
#include <boost/core/noncopyable.hpp>
#include <stdexcept>
#include <string>
#include <optional>
#include "elna/lexer.hpp"
#include "elna/state.hpp"
#include "elna/history.hpp"
namespace elna
{
/**
* Runtime exception for non recoverable errors.
*/
struct interactive_exception : public std::runtime_error
{
/**
* Constructor.
*/
interactive_exception();
};
/**
* Main loop.
*/
void loop();
/**
* Reads the next line.
* Returns no value upon receiving end of file.
*
* \param history Shell history.
* \return The read line.
*/
std::optional<editor_state> read_line(editor_history& history);
/**
* Runs a built-in or a command.
*
* \param line The command and arguments.
* \return Whether the input shoud continued (no exit requested).
*/
bool execute(const std::vector<token>& line);
/**
* Runs the binary specified in its argument.
*
* \param program Program name in PATH.
* \param arguments Command arguments.
*/
void launch(const std::string& program, const std::vector<std::string>& arguments);
/**
* Enables the raw mode.
*
* \return Whether the operation was successful.
*/
bool enable_raw_mode();
/**
* Disables the raw mode.
*/
void disable_raw_mode();
/**
* Reads a key.
*
* \return Read character.
*/
key read_key();
/**
* Calls autocompletion.
*
* \return Selected item.
*/
std::string complete();
}

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include/elna/lexer.hpp Normal file
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#pragma once
#include <string>
#include "elna/result.hpp"
namespace elna
{
/**
* Range over the source text that keeps track of the current position.
*/
struct source
{
class const_iterator
{
std::string::const_iterator m_buffer;
Position m_position;
const_iterator(std::string::const_iterator buffer, const Position& position);
public:
using iterator_category = std::forward_iterator_tag;
using difference_type = ptrdiff_t;
using value_type = char;
using pointer = const value_type *;
using reference = const value_type&;
const Position& position() const noexcept;
reference operator*() const noexcept;
pointer operator->() const noexcept;
const_iterator& operator++();
const_iterator& operator++(int);
bool operator==(const const_iterator& that) const noexcept;
bool operator!=(const const_iterator& that) const noexcept;
friend source;
};
source(const std::string& buffer);
const_iterator begin() const;
const_iterator end() const;
private:
const std::string& m_buffer;
};
/**
* Union type representing a single token.
*/
struct token
{
/**
* Token type.
*/
enum class type
{
word,
};
/**
* Type of the token value.
*/
using value = std::string;
token(const type of, source::const_iterator begin, source::const_iterator end);
type of() const noexcept;
const value& identifier() const noexcept;
const Position& position() const noexcept;
private:
std::string m_value;
Position m_position;
type m_type;
};
/**
* Split the source into tokens.
*
* \return Tokens or error.
*/
result<std::vector<token>> lex(const std::string& buffer);
}

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include/elna/result.hpp Normal file
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#pragma once
#include <cstddef>
#include <boost/outcome.hpp>
namespace elna
{
/**
* Position in the source text.
*/
struct Position
{
/// Line.
std::size_t line = 1;
/// Column.
std::size_t column = 1;
};
/**
* A compilation error consists of an error message and position.
*/
struct CompileError
{
private:
char const *message_;
Position position_;
public:
/**
* @param message Error text.
* @param position Error position in the source text.
*/
CompileError(char const *message, Position position) noexcept;
/// Error text.
char const *message() const noexcept;
/// Error line in the source text.
std::size_t line() const noexcept;
/// Error column in the source text.
std::size_t column() const noexcept;
};
template<typename T>
using result = boost::outcome_v2::result<T, CompileError>;
}

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include/elna/state.hpp Normal file
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#include <cstdint>
#include <cstring>
#include <string>
#include <variant>
namespace elna
{
constexpr const char *erase_line = "\x1b[2K";
constexpr const char *start_kitty_keybaord = "\x1b[>1u";
constexpr const char *end_kitty_keybaord = "\x1b[<u";
std::string cursor_to_column(const std::uint16_t position = 1);
enum class special_key
{
arrow_left,
arrow_right,
arrow_up,
arrow_down,
page_up,
page_down,
home_key,
end_key,
};
/**
* Key modifiers.
*/
enum class modifier : std::uint8_t
{
shift = 0b1, ///< 1
alt = 0b10, ///< 2
ctrl = 0b100, ///< 4
super = 0b1000, ///< 8
hyper = 0b10000, ///< 16
meta = 0b100000, ///< 32
caps_lock = 0b1000000, ///< 64
num_lock = 0b10000000, ///< 128
};
class key
{
std::variant<special_key, unsigned char> store;
std::uint8_t modifiers;
public:
key();
explicit key(const unsigned char c, const std::uint8_t modifiers = 0);
explicit key(const unsigned char c, const modifier modifiers);
explicit key(const special_key control, const std::uint8_t modifiers = 0);
explicit key(const special_key control, const modifier modifiers);
bool operator==(const unsigned char c) const;
friend bool operator==(const unsigned char c, const key& that);
bool operator==(const special_key control) const;
friend bool operator==(const special_key control, const key& that);
bool operator==(const key& that) const;
bool operator!=(const unsigned char c) const;
friend bool operator!=(const unsigned char c, const key& that);
bool operator!=(const special_key control) const;
friend bool operator!=(const special_key control, const key& that);
bool operator!=(const key& that) const;
unsigned char character() const;
special_key control() const;
bool modified(const std::uint8_t modifiers) const noexcept;
bool modified(const modifier modifiers) const noexcept;
bool is_character() const noexcept;
bool is_control() const noexcept;
bool empty() const noexcept;
};
/**
* The action should be performed after updating the editor state.
*/
enum class action
{
redraw, ///< Redraw everything.
write, ///< Write a single character.
finalize, ///< Finalize command input.
move, ///< Move the cursor.
ignore, ///< Do nothing.
complete, ///< Complete the input.
history, ///< Navigate the history.
};
/**
* The line editor with its state.
*/
class editor_state
{
std::string input;
std::string prompt = "> ";
std::size_t position{ 1 };
public:
editor_state();
/**
* Returns the current input gathered by the lin editor.
*
* \return User input.
*/
const std::string& command_line() const noexcept;
/**
* Processes the next keypress by changing the line editor state.
*
* \param key Pressed key.
* \return Action to do after the key was pressed.
*/
action process_keypress(const key& press);
/**
* Clears editors working area and writes drawing sequences into the
* buffer.
*
* \param T Output range for bytes.
* \param output Output buffer.
*/
template<typename T>
void draw(T output) const
{
std::string code;
std::copy(erase_line, erase_line + strlen(erase_line), output);
code = cursor_to_column();
std::copy(std::cbegin(code), std::cend(code), output);
std::copy(std::cbegin(this->prompt), std::cend(this->prompt), output);
std::copy(std::cbegin(this->input), std::cend(this->input), output);
code = cursor_to_column(absolute_position());
std::copy(std::cbegin(code), std::cend(code), output);
}
/**
* Computes the position in the terminal line.
*
* \return Position in the terminal line.
*/
std::size_t absolute_position() const noexcept;
/**
* Inserts text at cursor position.
*
* \param text Text to insert.
*/
void insert(const std::string& text);
/**
* Replaces the user input with the given string.
*
* \param text New user input string.
*/
void load(const std::string& text);
};
}

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include/elna/tester.hpp Normal file
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#pragma once
#include <cstdint>
namespace elna
{
class test_results final
{
std::uint32_t m_total{ 0 };
std::uint32_t m_passed{ 0 };
public:
test_results() = default;
std::uint32_t total() const noexcept;
std::uint32_t passed() const noexcept;
std::uint32_t failed() const noexcept;
int exit_code() const noexcept;
void add_exit_code(const int exit_code) noexcept;
};
}

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shell/history.cpp Normal file
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#include "elna/history.hpp"
namespace elna
{
editor_history::editor_history()
: commands{}, current_pointer(commands.cend())
{
}
void editor_history::push(const std::string& entry)
{
commands.push_front(entry);
current_pointer = commands.cbegin();
}
void editor_history::clear()
{
commands.clear();
current_pointer = commands.cend();
}
editor_history::const_iterator editor_history::prev() noexcept
{
if (this->current_pointer != cbegin())
{
this->current_pointer = std::prev(this->current_pointer);
}
return this->current_pointer;
}
editor_history::const_iterator editor_history::next() noexcept
{
if (this->current_pointer != cend())
{
this->current_pointer = std::next(this->current_pointer);
}
return this->current_pointer;
}
editor_history::const_iterator editor_history::cbegin() const noexcept
{
return this->commands.cbegin();
}
editor_history::const_iterator editor_history::cend() const noexcept
{
return this->commands.cend();
}
}

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shell/interactive.cpp Normal file
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#include <boost/process.hpp>
#include <termios.h>
#include <filesystem>
#include "elna/interactive.hpp"
namespace elna
{
static termios original_termios;
interactive_exception::interactive_exception()
: runtime_error("read")
{
}
template<typename T>
static std::pair<T, unsigned char> read_number()
{
T position{ 0 };
unsigned char c{ 0 };
while (read(STDIN_FILENO, &c, 1) == 1 && std::isdigit(c))
{
position = position * 10 + (c - '0');
}
return std::make_pair(position, c);
}
void loop()
{
editor_history history;
do
{
auto line = read_line(history);
if (!line.has_value())
{
write(STDOUT_FILENO, "\r\n", 2);
break;
}
history.push(line.value().command_line());
auto tokens = lex(line.value().command_line());
if (!execute(tokens.assume_value()))
{
break;
}
}
while (true);
}
std::optional<editor_state> read_line(editor_history& history)
{
editor_state state;
std::string buffer;
state.draw(std::back_inserter(buffer));
write(STDOUT_FILENO, buffer.data(), buffer.size());
while (true)
{
buffer.clear();
auto pressed_key = read_key();
if (pressed_key.empty())
{
continue;
}
switch (state.process_keypress(pressed_key))
{
case action::finalize:
if (pressed_key == key('d', modifier::ctrl))
{
return std::optional<editor_state>();
}
else if (pressed_key == '\r')
{
write(STDOUT_FILENO, "\r\n", 2);
return std::make_optional(state);
}
break;
case action::complete:
write(STDOUT_FILENO, "\x1b[1E\x1b[2K", 8);
state.insert(complete());
write(STDOUT_FILENO, "\x1b[1A", 4);
state.draw(std::back_inserter(buffer));
write(STDOUT_FILENO, buffer.data(), buffer.size());
break;
case action::redraw:
state.draw(std::back_inserter(buffer));
write(STDOUT_FILENO, buffer.data(), buffer.size());
break;
case action::write:
write(STDOUT_FILENO, &pressed_key, 1);
break;
case action::move:
buffer = cursor_to_column(state.absolute_position());
write(STDOUT_FILENO, buffer.data(), buffer.size());
break;
case action::ignore:
break;
case action::history:
editor_history::const_iterator history_iterator = history.cend();
if (pressed_key == key(special_key::arrow_up, modifier::ctrl))
{
history_iterator = history.next();
}
else if (pressed_key == key(special_key::arrow_down, modifier::ctrl))
{
history_iterator = history.prev();
}
if (history_iterator != history.cend())
{
state.load(*history_iterator);
state.draw(std::back_inserter(buffer));
write(STDOUT_FILENO, buffer.data(), buffer.size());
}
break;
}
}
}
key read_key()
{
char c{ 0 };
if (read(STDIN_FILENO, &c, 1) == -1 && errno != EAGAIN)
{
throw interactive_exception();
}
if (c != '\x1b')
{
return key(c);
}
if (read(STDIN_FILENO, &c, 1) != 1 || c != '[')
{
return key();
}
auto [number, last_char] = read_number<unsigned char>();
std::uint8_t modifiers{ 0 };
if (last_char == ';')
{
auto modifier_response = read_number<std::uint8_t>();
modifiers = modifier_response.first;
last_char = modifier_response.second;
}
if (number == 0 || number == 1)
{
switch (last_char)
{
case 'A':
return key(special_key::arrow_up, modifiers);
case 'B':
return key(special_key::arrow_down, modifiers);
case 'C':
return key(special_key::arrow_right, modifiers);
case 'D':
return key(special_key::arrow_left, modifiers);
case 'H':
return key(special_key::home_key, modifiers);
case 'F':
return key(special_key::end_key, modifiers);
}
}
else if (last_char == '~')
{
switch (number)
{
case 5:
return key(special_key::page_up, modifiers);
case 6:
return key(special_key::page_up, modifiers);
case 7:
return key(special_key::home_key, modifiers);
case 8:
return key(special_key::end_key, modifiers);
}
}
else if (last_char == 'u')
{
return key(number, modifiers);
}
return key();
}
bool execute(const std::vector<token>& tokens)
{
if (tokens.empty())
{
return true;
}
std::string program = tokens.front().identifier();
if (program == "exit")
{
return false;
}
else if (program == "cd")
{
std::filesystem::current_path(tokens[1].identifier());
return true;
}
std::vector<std::string> arguments;
for (auto argument = tokens.cbegin() + 1; argument != std::cend(tokens); ++argument)
{
arguments.push_back(argument->identifier());
}
launch(program, arguments);
return true;
}
void launch(const std::string& program, const std::vector<std::string>& arguments)
{
boost::process::system(boost::process::search_path(program), arguments);
}
bool enable_raw_mode()
{
if (tcgetattr(STDIN_FILENO, &original_termios) == -1)
{
return false;
}
termios raw = original_termios;
raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
raw.c_oflag &= ~(OPOST);
raw.c_cflag |= CS8;
raw.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
write(STDOUT_FILENO, start_kitty_keybaord, strlen(start_kitty_keybaord));
return tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) != -1;
}
void disable_raw_mode()
{
write(STDOUT_FILENO, end_kitty_keybaord, strlen(end_kitty_keybaord));
tcsetattr(STDIN_FILENO, TCSAFLUSH, &original_termios);
}
std::string complete()
{
boost::process::ipstream output;
boost::process::system("/usr/bin/fzf", "--height=10", "--layout=reverse",
boost::process::std_out > output);
std::string selections;
std::getline(output, selections, '\n');
return selections;
}
}

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shell/lexer.cpp Normal file
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#include "elna/lexer.hpp"
namespace elna
{
source::source(const std::string& buffer)
: m_buffer(buffer)
{
}
source::const_iterator source::begin() const
{
return source::const_iterator(std::cbegin(m_buffer), Position());
}
source::const_iterator source::end() const
{
Position end_position{ 0, 0 };
return source::const_iterator(std::cend(m_buffer), end_position);
}
source::const_iterator::const_iterator(std::string::const_iterator buffer, const Position& start_position)
: m_buffer(buffer), m_position(start_position)
{
}
const Position& source::const_iterator::position() const noexcept
{
return this->m_position;
}
source::const_iterator::reference source::const_iterator::operator*() const noexcept
{
return *m_buffer;
}
source::const_iterator::pointer source::const_iterator::operator->() const noexcept
{
return m_buffer.base();
}
source::const_iterator& source::const_iterator::operator++()
{
if (*this->m_buffer == '\n')
{
this->m_position.column = 1;
++this->m_position.line;
}
else
{
++this->m_position.column;
}
std::advance(this->m_buffer, 1);
return *this;
}
source::const_iterator& source::const_iterator::operator++(int)
{
auto tmp = *this;
++(*this);
return *this;
}
bool source::const_iterator::operator==(const source::const_iterator& that) const noexcept
{
return this->m_buffer == that.m_buffer;
}
bool source::const_iterator::operator!=(const source::const_iterator& that) const noexcept
{
return !(*this == that);
}
token::token(const type of, source::const_iterator begin, source::const_iterator end)
: m_type(of), m_value(begin, end)
{
}
token::type token::of() const noexcept
{
return m_type;
}
const token::value& token::identifier() const noexcept
{
return m_value;
}
const Position& token::position() const noexcept
{
return m_position;
}
result<std::vector<token>> lex(const std::string& buffer)
{
std::vector<token> tokens;
source input{ buffer };
for (auto iterator = input.begin(); iterator != input.end();)
{
if (*iterator == ' ' || *iterator == '\n')
{
}
else if (std::isgraph(*iterator))
{
auto current_position = iterator;
do
{
++current_position;
}
while (current_position != input.end() && std::isgraph(*current_position));
token new_token{ token::type::word, iterator, current_position };
tokens.push_back(new_token);
iterator = current_position;
continue;
}
++iterator;
}
return tokens;
}
}

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#include <cstdlib>
#include <unistd.h>
#include "elna/interactive.hpp"
int main()
{
if (!elna::enable_raw_mode())
{
std::perror("tcsetattr");
return EXIT_FAILURE;
}
std::atexit(elna::disable_raw_mode);
elna::loop();
return EXIT_SUCCESS;
}

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#include "elna/result.hpp"
namespace elna
{
CompileError::CompileError(char const *message, Position position) noexcept
{
this->message_ = message;
this->position_ = position;
}
char const *CompileError::message() const noexcept
{
return this->message_;
}
std::size_t CompileError::line() const noexcept
{
return this->position_.line;
}
std::size_t CompileError::column() const noexcept
{
return this->position_.column;
}
}

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#include "elna/state.hpp"
namespace elna
{
std::string cursor_to_column(const std::uint16_t position)
{
std::string code = std::to_string(position);
code.insert(0, "\x1b[");
code.push_back('G');
return code;
}
key::key()
: store(static_cast<unsigned char>(0x1b))
{
}
key::key(const unsigned char c, const std::uint8_t modifiers)
: store(c), modifiers(modifiers == 0 ? 0 : modifiers - 1)
{
}
key::key(const unsigned char c, const modifier modifiers)
: store(c), modifiers(static_cast<uint8_t>(modifiers))
{
}
key::key(const special_key control, const std::uint8_t modifiers)
: store(control), modifiers(modifiers == 0 ? 0 : modifiers - 1)
{
}
key::key(const special_key control, const modifier modifiers)
: store(control), modifiers(static_cast<uint8_t>(modifiers))
{
}
unsigned char key::character() const
{
return std::get<unsigned char>(this->store);
}
special_key key::control() const
{
return std::get<special_key>(this->store);
}
bool key::modified(const std::uint8_t modifiers) const noexcept
{
return this->modifiers == modifiers;
}
bool key::modified(const modifier modifiers) const noexcept
{
return this->modifiers == static_cast<std::uint8_t>(modifiers);
}
bool key::operator==(const unsigned char c) const
{
return std::holds_alternative<unsigned char>(this->store)
&& std::get<unsigned char>(this->store) == c;
}
bool key::operator==(const special_key control) const
{
return std::holds_alternative<special_key>(this->store)
&& std::get<special_key>(this->store) == control;
}
bool key::operator==(const key& that) const
{
return this->store == that.store;
}
bool key::operator!=(const unsigned char c) const
{
return !(*this == c);
}
bool key::operator!=(const special_key control) const
{
return !(*this == control);
}
bool key::operator!=(const key& that) const
{
return !(*this == that);
}
bool key::is_character() const noexcept
{
return std::holds_alternative<unsigned char>(this->store);
}
bool key::is_control() const noexcept
{
return std::holds_alternative<special_key>(this->store);
}
bool key::empty() const noexcept
{
return *this == '\x1b';
}
bool operator==(const special_key control, const key& that)
{
return that == control;
}
bool operator==(const char c, const key& that)
{
return that == c;
}
bool operator!=(const special_key control, const key& that)
{
return that != control;
}
bool operator!=(const char c, const key& that)
{
return that != c;
}
editor_state::editor_state()
{
this->input.reserve(1024);
}
void editor_state::load(const std::string& text)
{
this->input = text;
}
const std::string& editor_state::command_line() const noexcept
{
return this->input;
}
std::size_t editor_state::absolute_position() const noexcept
{
return this->prompt.size() + this->position;
}
void editor_state::insert(const std::string& text)
{
this->input.insert(std::end(this->input), std::cbegin(text), std::cend(text));
}
action editor_state::process_keypress(const key& press)
{
if (press.is_control())
{
switch (press.control())
{
case special_key::arrow_left:
if (this->position > 1)
{
--this->position;
}
return action::move;
case special_key::arrow_right:
if (this->position + 1 < this->input.size() + this->prompt.size())
{
++this->position;
}
return action::move;
case special_key::arrow_up:
case special_key::arrow_down:
return action::history;
case special_key::home_key:
this->position = 1;
return action::move;
case special_key::end_key:
this->position = this->input.size() + 1;
return action::move;
default:
return action::ignore;
}
}
else if (press.modified(modifier::ctrl))
{
switch (press.character())
{
case 'd':
return action::finalize;
case 't':
return action::complete;
default:
return action::ignore;
}
}
else
{
switch (press.character())
{
case 127: // Backspace.
if (this->position <= this->input.size() + 1 && this->position > 1)
{
--this->position;
this->input.erase(this->position - 1, 1);
}
return action::redraw;
case '\r':
return action::finalize;
default:
++this->position;
this->input.push_back(press.character());
return action::write;
}
}
}
}

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/**
* Argument parsing.
*/
module elna.arguments;
import std.algorithm;
import std.range;
import std.sumtype;
struct ArgumentError
{
enum Type
{
expectedOutputFile,
noInput,
superfluousArguments,
}
private Type type_;
private string argument_;
@property Type type() const @nogc nothrow pure @safe
{
return this.type_;
}
@property string argument() const @nogc nothrow pure @safe
{
return this.argument_;
}
void toString(OR)(OR range)
if (isOutputRage!OR)
{
final switch (Type)
{
case Type.expectedOutputFile:
put(range, "Expected an output filename after -o");
break;
case Type.noInput:
put(range, "No input files specified");
break;
}
}
}
/**
* Supported compiler arguments.
*/
struct Arguments
{
private bool assembler_;
private string output_;
private string inFile_;
@property string inFile() @nogc nothrow pure @safe
{
return this.inFile_;
}
/**
* Returns: Whether to generate assembly instead of an object file.
*/
@property bool assembler() const @nogc nothrow pure @safe
{
return this.assembler_;
}
/**
* Returns: Output file.
*/
@property string output() const @nogc nothrow pure @safe
{
return this.output_;
}
/**
* Parse command line arguments.
*
* The first argument is expected to be the program name (and it is
* ignored).
*
* Params:
* arguments = Command line arguments.
*
* Returns: Parsed arguments or an error.
*/
static SumType!(ArgumentError, Arguments) parse(string[] arguments)
@nogc nothrow pure @safe
{
if (!arguments.empty)
{
arguments.popFront;
}
alias ReturnType = typeof(return);
return parseArguments(arguments).match!(
(Arguments parsed) {
if (parsed.inFile is null)
{
return ReturnType(ArgumentError(ArgumentError.Type.noInput));
}
else if (!arguments.empty)
{
return ReturnType(ArgumentError(
ArgumentError.Type.superfluousArguments,
arguments.front
));
}
return ReturnType(parsed);
},
(ArgumentError argumentError) => ReturnType(argumentError)
);
}
private static SumType!(ArgumentError, Arguments) parseArguments(ref string[] arguments)
@nogc nothrow pure @safe
{
Arguments parsed;
while (!arguments.empty)
{
if (arguments.front == "-s")
{
parsed.assembler_ = true;
}
else if (arguments.front == "-o")
{
if (arguments.empty)
{
return typeof(return)(ArgumentError(
ArgumentError.Type.expectedOutputFile,
arguments.front
));
}
arguments.popFront;
parsed.output_ = arguments.front;
}
else if (arguments.front == "--")
{
arguments.popFront;
parsed.inFile_ = arguments.front;
arguments.popFront;
break;
}
else if (!arguments.front.startsWith("-"))
{
parsed.inFile_ = arguments.front;
}
arguments.popFront;
}
return typeof(return)(parsed);
}
}

100
source/elna/backend.d
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module elna.backend;
import core.stdc.stdio;
import elna.elf;
import elna.ir;
import elna.extended;
import elna.riscv;
import elna.lexer;
import elna.parser;
import elna.result;
import std.algorithm;
import std.sumtype;
import std.typecons;
import tanya.os.error;
import tanya.container.array;
import tanya.container.string;
import tanya.memory.allocator;
private Nullable!String readSource(string source) @nogc
{
enum size_t bufferSize = 255;
auto sourceFilename = String(source);
return readFile(sourceFilename).match!(
(ErrorCode errorCode) {
perror(sourceFilename.toStringz);
return Nullable!String();
},
(Array!ubyte contents) => nullable(String(cast(char[]) contents.get))
);
}
int generate(string inFile, ref String outputFilename) @nogc
{
auto sourceText = readSource(inFile);
if (sourceText.isNull)
{
return 3;
}
auto tokens = lex(sourceText.get.get);
if (!tokens.valid)
{
auto compileError = tokens.error.get;
printf("%lu:%lu: %s\n", compileError.line, compileError.column, compileError.message.ptr);
return 1;
}
auto ast = parse(tokens.result);
if (!ast.valid)
{
auto compileError = ast.error.get;
printf("%lu:%lu: %s\n", compileError.line, compileError.column, compileError.message.ptr);
return 2;
}
auto transformVisitor = defaultAllocator.make!TransformVisitor();
auto ir = transformVisitor.visit(ast.result);
defaultAllocator.dispose(transformVisitor);
auto handle = File.open(outputFilename.toStringz, BitFlags!(File.Mode)(File.Mode.truncate));
if (!handle.valid)
{
return 1;
}
auto program = writeNext(ir);
auto elf = Elf!ELFCLASS32(move(handle));
auto readOnlyData = Array!ubyte(cast(const(ubyte)[]) "%d\n".ptr[0 .. 4]); // With \0.
elf.addReadOnlyData(String(".CL0"), readOnlyData);
elf.addCode(program.name, program.text);
elf.addExternSymbol(String("printf"));
foreach (ref reference; program.symbols)
{
elf.Rela relocationEntry = {
r_offset: cast(elf.Addr) reference.offset
};
elf.Rela relocationSub = {
r_offset: cast(elf.Addr) reference.offset,
r_info: R_RISCV_RELAX
};
final switch (reference.target)
{
case Reference.Target.text:
relocationEntry.r_info = R_RISCV_CALL;
break;
case Reference.Target.high20:
relocationEntry.r_info = R_RISCV_HI20;
break;
case Reference.Target.lower12i:
relocationEntry.r_info = R_RISCV_LO12_I;
break;
}
elf.relocate(reference.name, relocationEntry, relocationSub);
}
elf.finish();
return 0;
}

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335
source/elna/extended.d
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/**
* File I/O that can be moved into more generic library when and if finished.
*/
module elna.extended;
import core.stdc.errno;
import core.stdc.stdio;
import std.sumtype;
import std.typecons;
import tanya.os.error;
import tanya.container.array;
import tanya.container.string;
/**
* File handle abstraction.
*/
struct File
{
/// Plattform dependent file type.
alias Handle = FILE*;
/// Uninitialized file handle value.
enum Handle invalid = null;
/**
* Relative position.
*/
enum Whence
{
/// Relative to the start of the file.
set = SEEK_SET,
/// Relative to the current cursor position.
currentt = SEEK_CUR,
/// Relative from the end of the file.
end = SEEK_END,
}
/**
* File open modes.
*/
enum Mode
{
/// Open the file for reading.
read = 1 << 0,
/// Open the file for writing. The stream is positioned at the beginning
/// of the file.
write = 1 << 1,
/// Open the file for writing and remove its contents.
truncate = 1 << 2,
/// Open the file for writing. The stream is positioned at the end of
/// the file.
append = 1 << 3,
}
private enum Status
{
invalid,
owned,
borrowed,
}
private union Storage
{
Handle handle;
ErrorCode errorCode;
}
private Storage storage;
private Status status = Status.invalid;
@disable this(scope return ref File f);
@disable this();
/**
* Closes the file.
*/
~this() @nogc nothrow
{
if (this.status == Status.owned)
{
fclose(this.storage.handle);
}
this.storage.handle = invalid;
this.status = Status.invalid;
}
/**
* Construct the object with the given system handle. The won't be claused
* in the descructor if this constructor is used.
*
* Params:
* handle = File handle to be wrapped by this structure.
*/
this(Handle handle) @nogc nothrow pure @safe
{
this.storage.handle = handle;
this.status = Status.borrowed;
}
/**
* Returns: Plattform dependent file handle.
*/
@property Handle handle() @nogc nothrow pure @trusted
{
return valid ? this.storage.handle : invalid;
}
/**
* Returns: An error code if an error has occurred.
*/
@property ErrorCode errorCode() @nogc nothrow pure @safe
{
return valid ? ErrorCode() : this.storage.errorCode;
}
/**
* Returns: Whether a valid, opened file is represented.
*/
@property bool valid() @nogc nothrow pure @safe
{
return this.status != Status.invalid;
}
/**
* Transfers the file into invalid state.
*
* Returns: The old file handle.
*/
Handle reset() @nogc nothrow pure @safe
{
if (!valid)
{
return invalid;
}
auto oldHandle = handle;
this.status = Status.invalid;
this.storage.errorCode = ErrorCode();
return oldHandle;
}
/**
* Sets stream position in the file.
*
* Params:
* offset = File offset.
* whence = File position to add the offset to.
*
* Returns: Error code if any.
*/
ErrorCode seek(size_t offset, Whence whence) @nogc nothrow
{
if (!valid)
{
return ErrorCode(ErrorCode.ErrorNo.badDescriptor);
}
if (fseek(this.storage.handle, offset, whence))
{
return ErrorCode(cast(ErrorCode.ErrorNo) errno);
}
return ErrorCode();
}
/**
* Returns: Current offset or an error.
*/
SumType!(ErrorCode, size_t) tell() @nogc nothrow
{
if (!valid)
{
return typeof(return)(ErrorCode(ErrorCode.ErrorNo.badDescriptor));
}
auto result = ftell(this.storage.handle);
if (result < 0)
{
return typeof(return)(ErrorCode(cast(ErrorCode.ErrorNo) errno));
}
return typeof(return)(cast(size_t) result);
}
/**
* Params:
* buffer = Destination buffer.
*
* Returns: Bytes read. $(D_PSYMBOL ErrorCode.ErrorNo.success) means that
* while reading the file an unknown error has occurred.
*/
SumType!(ErrorCode, size_t) read(ubyte[] buffer) @nogc nothrow
{
if (!valid)
{
return typeof(return)(ErrorCode(ErrorCode.ErrorNo.badDescriptor));
}
const bytesRead = fread(buffer.ptr, 1, buffer.length, this.storage.handle);
if (bytesRead == buffer.length || eof())
{
return typeof(return)(bytesRead);
}
return typeof(return)(ErrorCode());
}
/**
* Params:
* buffer = Source buffer.
*
* Returns: Bytes written. $(D_PSYMBOL ErrorCode.ErrorNo.success) means that
* while reading the file an unknown error has occurred.
*/
SumType!(ErrorCode, size_t) write(const(ubyte)[] buffer) @nogc nothrow
{
if (!valid)
{
return typeof(return)(ErrorCode(ErrorCode.ErrorNo.badDescriptor));
}
const bytesWritten = fwrite(buffer.ptr, 1, buffer.length, this.storage.handle);
if (bytesWritten == buffer.length)
{
return typeof(return)(buffer.length);
}
return typeof(return)(ErrorCode());
}
/**
* Returns: EOF status of the file.
*/
bool eof() @nogc nothrow
{
return valid && feof(this.storage.handle) != 0;
}
/**
* Constructs a file object that will be closed in the destructor.
*
* Params:
* filename = The file to open.
*
* Returns: Opened file or an error.
*/
static File open(const(char)* filename, BitFlags!Mode mode) @nogc nothrow
{
char[3] modeBuffer = "\0\0\0";
if (mode.truncate)
{
modeBuffer[0] = 'w';
if (mode.read)
{
modeBuffer[1] = '+';
}
}
else if (mode.append)
{
modeBuffer[0] = 'a';
if (mode.read)
{
modeBuffer[1] = '+';
}
}
else if (mode.read)
{
modeBuffer[0] = 'r';
if (mode.write)
{
modeBuffer[1] = '+';
}
}
auto newHandle = fopen(filename, modeBuffer.ptr);
auto newFile = File(newHandle);
if (newHandle is null)
{
newFile.status = Status.invalid;
newFile.storage.errorCode = ErrorCode(cast(ErrorCode.ErrorNo) errno);
}
else
{
if (mode == BitFlags!Mode(Mode.write))
{
rewind(newHandle);
}
newFile.status = Status.owned;
}
return newFile;
}
}
/**
* Reads the whole file and returns its contents.
*
* Params:
* sourceFilename = Source filename.
*
* Returns: File contents or an error.
*
* See_Also: $(D_PSYMBOL File.read)
*/
SumType!(ErrorCode, Array!ubyte) readFile(String sourceFilename) @nogc
{
enum size_t bufferSize = 255;
auto sourceFile = File.open(sourceFilename.toStringz, BitFlags!(File.Mode)(File.Mode.read));
if (!sourceFile.valid)
{
return typeof(return)(sourceFile.errorCode);
}
Array!ubyte sourceText;
size_t totalRead;
size_t bytesRead;
do
{
sourceText.length = sourceText.length + bufferSize;
const readStatus = sourceFile
.read(sourceText[totalRead .. $].get)
.match!(
(ErrorCode errorCode) => nullable(errorCode),
(size_t bytesRead_) {
bytesRead = bytesRead_;
return Nullable!ErrorCode();
}
);
if (!readStatus.isNull)
{
return typeof(return)(readStatus.get);
}
totalRead += bytesRead;
}
while (bytesRead == bufferSize);
sourceText.length = totalRead;
return typeof(return)(sourceText);
}

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module elna.ir;
import parser = elna.parser;
import tanya.container.array;
import tanya.container.hashtable;
import tanya.container.string;
import tanya.memory.allocator;
public import elna.parser : BinaryOperator;
/**
* Mapping between the parser and IR AST.
*/
struct ASTMapping
{
alias Node = .Node;
alias Definition = .Definition;
alias VariableDeclaration = .VariableDeclaration;
alias Statement = .Operand;
alias BangStatement = .Operand;
alias Block = .Definition;
alias Expression = .Operand;
alias Number = .Number;
alias Variable = .Number;
alias BinaryExpression = .Variable;
}
/**
* IR visitor.
*/
extern(C++)
interface IRVisitor
{
abstract void visit(Node) @nogc;
abstract void visit(Definition) @nogc;
abstract void visit(Operand) @nogc;
abstract void visit(BinaryExpression) @nogc;
abstract void visit(Variable) @nogc;
abstract void visit(VariableDeclaration) @nogc;
abstract void visit(Number) @nogc;
}
/**
* AST node.
*/
extern(C++)
abstract class Node
{
abstract void accept(IRVisitor) @nogc;
}
/**
* Definition.
*/
extern(C++)
class Definition : Node
{
char[] identifier;
Array!BinaryExpression statements;
Array!VariableDeclaration variableDeclarations;
Operand result;
override void accept(IRVisitor visitor) @nogc
{
visitor.visit(this);
}
}
extern(C++)
abstract class Statement : Node
{
}
extern(C++)
abstract class Operand : Node
{
override void accept(IRVisitor visitor) @nogc
{
visitor.visit(this);
}
}
extern(C++)
class Number : Operand
{
int value;
override void accept(IRVisitor visitor) @nogc
{
visitor.visit(this);
}
}
extern(C++)
class Variable : Operand
{
size_t counter;
override void accept(IRVisitor visitor) @nogc
{
visitor.visit(this);
}
}
extern(C++)
class VariableDeclaration : Node
{
String identifier;
override void accept(IRVisitor visitor) @nogc
{
visitor.visit(this);
}
}
extern(C++)
class BinaryExpression : Statement
{
Operand lhs, rhs;
BinaryOperator operator;
this(Operand lhs, Operand rhs, BinaryOperator operator)
@nogc
{
this.lhs = lhs;
this.rhs = rhs;
this.operator = operator;
}
override void accept(IRVisitor visitor) @nogc
{
visitor.visit(this);
}
}
extern(C++)
class BangExpression : Statement
{
Operand operand;
this(Operand operand)
{
this.operand = operand;
}
override void accept(IRVisitor visitor) @nogc
{
visitor.visit(this);
}
}
final class TransformVisitor : parser.ParserVisitor!ASTMapping
{
private HashTable!(String, int) constants;
private Array!BinaryExpression statements;
ASTMapping.Node visit(parser.Node node) @nogc
{
assert(false, "Not implemented");
}
ASTMapping.Definition visit(parser.Definition definition) @nogc
{
assert(false, "Not implemented");
}
ASTMapping.VariableDeclaration visit(parser.VariableDeclaration declaration) @nogc
{
assert(false, "Not implemented");
}
ASTMapping.BangStatement visit(parser.BangStatement statement) @nogc
{
return statement.expression.accept(this);
}
ASTMapping.Block visit(parser.Block block) @nogc
{
auto target = defaultAllocator.make!Definition;
this.constants = transformConstants(block.definitions);
target.result = block.statement.accept(this);
target.statements = this.statements;
target.variableDeclarations = transformVariableDeclarations(block.variableDeclarations);
return target;
}
ASTMapping.Expression visit(parser.Expression expression) @nogc
{
if ((cast(parser.Number) expression) !is null)
{
return (cast(parser.Number) expression).accept(this);
}
if ((cast(parser.Variable) expression) !is null)
{
return (cast(parser.Variable) expression).accept(this);
}
else if ((cast(parser.BinaryExpression) expression) !is null)
{
return (cast(parser.BinaryExpression) expression).accept(this);
}
assert(false, "Invalid expression type");
}
ASTMapping.Number visit(parser.Number number) @nogc
{
auto numberExpression = defaultAllocator.make!Number;
numberExpression.value = number.value;
return numberExpression;
}
ASTMapping.Variable visit(parser.Variable variable) @nogc
{
auto numberExpression = defaultAllocator.make!Number;
numberExpression.value = this.constants[variable.identifier];
return numberExpression;
}
ASTMapping.BinaryExpression visit(parser.BinaryExpression binaryExpression) @nogc
{
auto target = defaultAllocator.make!BinaryExpression(
binaryExpression.lhs.accept(this),
binaryExpression.rhs.accept(this),
binaryExpression.operator
);
statements.insertBack(target);
auto newVariable = defaultAllocator.make!Variable;
newVariable.counter = statements.length;
return newVariable;
}
private Number transformNumber(parser.Number number) @nogc
{
return defaultAllocator.make!Number(number.value);
}
override Operand visit(parser.Statement statement) @nogc
{
if ((cast(parser.BangStatement) statement) !is null)
{
return (cast(parser.BangStatement) statement).accept(this);
}
assert(false, "Invalid statement type");
}
private HashTable!(String, int) transformConstants(ref Array!(parser.Definition) definitions) @nogc
{
typeof(return) constants;
foreach (definition; definitions[])
{
constants[definition.identifier] = definition.number.value;
}
return constants;
}
Array!VariableDeclaration transformVariableDeclarations(ref Array!(parser.VariableDeclaration) variableDeclarations)
@nogc
{
typeof(return) variables;
foreach (ref variableDeclaration; variableDeclarations)
{
auto newDeclaration = defaultAllocator.make!VariableDeclaration;
newDeclaration.identifier = variableDeclaration.identifier;
variables.insertBack(newDeclaration);
}
return variables;
}
}

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module elna.lexer;
import core.stdc.stdlib;
import core.stdc.ctype;
import core.stdc.string;
import elna.result;
import std.range;
import tanya.container.array;
import tanya.container.string;
extern(C++)
struct Token
{
enum Type
{
number,
operator,
let,
identifier,
equals,
var,
semicolon,
leftParen,
rightParen,
bang,
dot,
comma,
}
union Value
{
int number;
String identifier;
}
private Type type;
private Value value_;
private Position position_;
@disable this();
this(Type type, Position position) @nogc nothrow pure @safe
{
this.type = type;
this.position_ = position;
}
this(Type type, int value, Position position) @nogc nothrow pure @trusted
in (type == Type.number)
{
this(type, position);
this.value_.number = value;
}
this()(Type type, auto ref String value, Position position)
@nogc nothrow pure @trusted
in (type == Type.identifier || type == Type.operator)
{
this(type, position);
this.value_.identifier = value;
}
/**
* Params:
* type = Expected type.
*
* Returns: Whether this token is of the expected type.
*/
bool ofType(Type type) const @nogc nothrow pure @safe
{
return this.type == type;
}
@property auto value(Type type)() @nogc nothrow pure @trusted
in (ofType(type), "Expected type: " ~ type.stringof)
{
static if (type == Type.number)
{
return this.value_.number;
}
else static if (type == Type.identifier || type == Type.operator)
{
return this.value_.identifier;
}
else
{
static assert(false, "This type doesn't have a value");
}
}
/**
* Returns: The token position in the source text.
*/
@property const(Position) position() const @nogc nothrow pure @safe
{
return this.position_;
}
}
/**
* Range over the source text that keeps track of the current position.
*/
extern(C++)
struct Source
{
char* buffer_;
size_t length_;
Position position;
this(char* buffer, const size_t length) @nogc nothrow pure
{
this.buffer_ = buffer;
this.length_ = length;
}
@disable this();
bool empty() @nogc nothrow pure @safe
{
return this.length == 0;
}
char front() @nogc nothrow pure
in (!empty)
{
return this.buffer_[0];
}
void popFront() @nogc nothrow pure
in (!empty)
{
++this.buffer_;
--this.length_;
++this.position.column;
}
void breakLine() @nogc nothrow pure
in (!empty)
{
++this.buffer_;
--this.length_;
++this.position.line;
this.position.column = 1;
}
@property size_t length() const @nogc nothrow pure @safe
{
return this.length_;
}
char opIndex(size_t index) @nogc nothrow pure
in (index < length)
{
return this.buffer_[index];
}
char* buffer() @nogc nothrow pure
{
return this.buffer_;
}
}
Result!(Array!Token) lex(char[] buffer) @nogc
{
Array!Token tokens;
auto source = Source(buffer.ptr, buffer.length);
while (!source.empty)
{
if (source.front == ' ')
{
source.popFront;
}
else if (source.front >= '0' && source.front <= '9') // Multi-digit.
{
tokens.insertBack(Token(Token.Type.number, source.front - '0', source.position));
source.popFront;
}
else if (source.front == '=')
{
tokens.insertBack(Token(Token.Type.equals, source.position));
source.popFront;
}
else if (source.front == '(')
{
tokens.insertBack(Token(Token.Type.leftParen, source.position));
source.popFront;
}
else if (source.front == ')')
{
tokens.insertBack(Token(Token.Type.rightParen, source.position));
source.popFront;
}
else if (source.front == ';')
{
tokens.insertBack(Token(Token.Type.semicolon, source.position));
source.popFront;
}
else if (source.front == ',')
{
tokens.insertBack(Token(Token.Type.comma, source.position));
source.popFront;
}
else if (source.front == '!')
{
tokens.insertBack(Token(Token.Type.bang, source.position));
source.popFront;
}
else if (source.front == '.')
{
tokens.insertBack(Token(Token.Type.dot, source.position));
source.popFront;
}
else if (isalpha(source.front))
{
size_t i = 1;
while (i < source.length && isalpha(source[i]))
{
++i;
}
if (source.buffer[0 .. i] == "const")
{
tokens.insertBack(Token(Token.Type.let, source.position));
}
else if (source.buffer[0 .. i] == "var")
{
tokens.insertBack(Token(Token.Type.var, source.position));
}
else
{
auto identifier = String(source.buffer[0 .. i]);
tokens.insertBack(Token(Token.Type.identifier, identifier, source.position));
}
source.popFrontN(i);
}
else if (source.front == '+' || source.front == '-')
{
String operator;
operator.insertBack(source.front);
tokens.insertBack(Token(Token.Type.operator, operator, source.position));
source.popFront;
}
else if (source.front == '\n')
{
source.breakLine;
}
else
{
return typeof(return)("Unexptected next character", source.position);
}
}
return typeof(return)(tokens);
}

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module elna.parser;
import elna.lexer;
import elna.result;
import tanya.container.array;
import tanya.container.string;
import tanya.memory.allocator;
/**
* Parser visitor.
*/
interface ParserVisitor(Mapping)
{
Mapping.Node visit(Node) @nogc;
Mapping.Definition visit(Definition) @nogc;
Mapping.VariableDeclaration visit(VariableDeclaration) @nogc;
Mapping.Statement visit(Statement) @nogc;
Mapping.BangStatement visit(BangStatement) @nogc;
Mapping.Block visit(Block) @nogc;
Mapping.Expression visit(Expression) @nogc;
Mapping.Number visit(Number) @nogc;
Mapping.Variable visit(Variable) @nogc;
Mapping.BinaryExpression visit(BinaryExpression) @nogc;
}
/**
* AST node.
*/
abstract class Node
{
Mapping.Node accept(Mapping)(ParserVisitor!Mapping visitor) @nogc
{
return visitor.visit(this);
}
}
/**
* Constant definition.
*/
class Definition : Node
{
Number number;
String identifier;
Mapping.Definition accept(Mapping)(ParserVisitor!Mapping visitor) @nogc
{
return visitor.visit(this);
}
}
/**
* Variable declaration.
*/
class VariableDeclaration : Node
{
String identifier;
Mapping.VariableDeclaration accept(Mapping)(ParserVisitor!Mapping visitor) @nogc
{
return visitor.visit(this);
}
}
abstract class Statement : Node
{
Mapping.Statement accept(Mapping)(ParserVisitor!Mapping visitor) @nogc
{
return visitor.visit(this);
}
}
class BangStatement : Statement
{
Expression expression;
Mapping.BangStatement accept(Mapping)(ParserVisitor!Mapping visitor) @nogc
{
return visitor.visit(this);
}
}
class Block : Node
{
Array!Definition definitions;
Array!VariableDeclaration variableDeclarations;
Statement statement;
Mapping.Block accept(Mapping)(ParserVisitor!Mapping visitor) @nogc
{
return visitor.visit(this);
}
}
abstract class Expression : Node
{
Mapping.Expression accept(Mapping)(ParserVisitor!Mapping visitor) @nogc
{
return visitor.visit(this);
}
}
class Number : Expression
{
int value;
Mapping.Number accept(Mapping)(ParserVisitor!Mapping visitor) @nogc
{
return visitor.visit(this);
}
}
class Variable : Expression
{
String identifier;
Mapping.Variable accept(Mapping)(ParserVisitor!Mapping visitor) @nogc
{
return visitor.visit(this);
}
}
enum BinaryOperator
{
sum,
subtraction
}
class BinaryExpression : Expression
{
Expression lhs, rhs;
BinaryOperator operator;
this(Expression lhs, Expression rhs, String operator) @nogc
{
this.lhs = lhs;
this.rhs = rhs;
if (operator == "+")
{
this.operator = BinaryOperator.sum;
}
else if (operator == "-")
{
this.operator = BinaryOperator.subtraction;
}
else
{
assert(false, "Invalid binary operator");
}
}
Mapping.BinaryExpression accept(Mapping)(ParserVisitor!Mapping visitor) @nogc
{
return visitor.visit(this);
}
}
private Result!Expression parseFactor(ref Array!Token.Range tokens) @nogc
in (!tokens.empty, "Expected factor, got end of stream")
{
if (tokens.front.ofType(Token.Type.identifier))
{
auto variable = defaultAllocator.make!Variable;
variable.identifier = tokens.front.value!(Token.Type.identifier);
tokens.popFront;
return Result!Expression(variable);
}
else if (tokens.front.ofType(Token.Type.number))
{
auto number = defaultAllocator.make!Number;
number.value = tokens.front.value!(Token.Type.number);
tokens.popFront;
return Result!Expression(number);
}
else if (tokens.front.ofType(Token.Type.leftParen))
{
tokens.popFront;
auto expression = parseExpression(tokens);
tokens.popFront;
return expression;
}
return Result!Expression("Expected a factor", tokens.front.position);
}
private Result!Expression parseTerm(ref Array!(Token).Range tokens) @nogc
{
return parseFactor(tokens);
}
private Result!Expression parseExpression(ref Array!(Token).Range tokens) @nogc
in (!tokens.empty, "Expected expression, got end of stream")
{
auto term = parseTerm(tokens);
if (!term.valid || tokens.empty || !tokens.front.ofType(Token.Type.operator))
{
return term;
}
auto operator = tokens.front.value!(Token.Type.operator);
tokens.popFront;
auto expression = parseExpression(tokens);
if (expression.valid)
{
auto binaryExpression = defaultAllocator
.make!BinaryExpression(term.result, expression.result, operator);
return Result!Expression(binaryExpression);
}
else
{
return Result!Expression("Expected right-hand side to be an expression", tokens.front.position);
}
}
private Result!Definition parseDefinition(ref Array!Token.Range tokens) @nogc
in (!tokens.empty, "Expected definition, got end of stream")
{
auto definition = defaultAllocator.make!Definition;
definition.identifier = tokens.front.value!(Token.Type.identifier); // Copy.
tokens.popFront();
tokens.popFront(); // Skip the equals sign.
if (tokens.front.ofType(Token.Type.number))
{
auto number = defaultAllocator.make!Number;
number.value = tokens.front.value!(Token.Type.number);
definition.number = number;
tokens.popFront;
return Result!Definition(definition);
}
return Result!Definition("Expected a number", tokens.front.position);
}
private Result!Statement parseStatement(ref Array!Token.Range tokens) @nogc
in (!tokens.empty, "Expected block, got end of stream")
{
if (tokens.front.ofType(Token.Type.bang))
{
tokens.popFront;
auto statement = defaultAllocator.make!BangStatement;
auto expression = parseExpression(tokens);
if (expression.valid)
{
statement.expression = expression.result;
}
else
{
return Result!Statement(expression.error.get);
}
return Result!Statement(statement);
}
return Result!Statement("Expected ! statement", tokens.front.position);
}
private Result!(Array!Definition) parseDefinitions(ref Array!Token.Range tokens) @nogc
in (!tokens.empty, "Expected definition, got end of stream")
{
tokens.popFront; // Skip const.
Array!Definition definitions;
while (!tokens.empty)
{
auto definition = parseDefinition(tokens);
if (!definition.valid)
{
return typeof(return)(definition.error.get);
}
definitions.insertBack(definition.result);
if (tokens.front.ofType(Token.Type.semicolon))
{
break;
}
if (tokens.front.ofType(Token.Type.comma))
{
tokens.popFront;
}
}
return typeof(return)(definitions);
}
private Result!(Array!VariableDeclaration) parseVariableDeclarations(ref Array!Token.Range tokens) @nogc
in (!tokens.empty, "Expected variable declarations, got end of stream")
{
tokens.popFront; // Skip var.
Array!VariableDeclaration variableDeclarations;
while (!tokens.empty)
{
auto currentToken = tokens.front;
if (currentToken.ofType(Token.Type.identifier))
{
auto variableDeclaration = defaultAllocator.make!VariableDeclaration;
variableDeclaration.identifier = currentToken.value!(Token.Type.identifier);
variableDeclarations.insertBack(variableDeclaration);
tokens.popFront;
}
else
{
return typeof(return)("Expected variable name", tokens.front.position);
}
if (tokens.empty)
{
return typeof(return)("Expected \";\" or \",\" name", currentToken.position);
}
if (tokens.front.ofType(Token.Type.semicolon))
{
break;
}
if (tokens.front.ofType(Token.Type.comma))
{
tokens.popFront;
}
}
return typeof(return)(variableDeclarations);
}
private Result!Block parseBlock(ref Array!Token.Range tokens) @nogc
in (!tokens.empty, "Expected block, got end of stream")
{
auto block = defaultAllocator.make!Block;
if (tokens.front.ofType(Token.Type.let))
{
auto constDefinitions = parseDefinitions(tokens);
if (constDefinitions.valid)
{
block.definitions = constDefinitions.result;
}
else
{
return Result!Block(constDefinitions.error.get);
}
tokens.popFront;
}
if (tokens.front.ofType(Token.Type.var))
{
auto variableDeclarations = parseVariableDeclarations(tokens);
if (variableDeclarations.valid)
{
block.variableDeclarations = variableDeclarations.result;
}
else
{
return Result!Block(variableDeclarations.error.get);
}
tokens.popFront;
}
auto statement = parseStatement(tokens);
if (statement.valid)
{
block.statement = statement.result;
}
else
{
return Result!Block(statement.error.get);
}
return Result!Block(block);
}
Result!Block parse(ref Array!Token tokenStream) @nogc
{
auto tokens = tokenStream[];
return parseBlock(tokens);
}

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module elna.result;
import std.typecons;
import tanya.container.array;
import tanya.container.string;
/**
* Position in the source text.
*/
struct Position
{
/// Line.
size_t line = 1;
/// Column.
size_t column = 1;
}
struct CompileError
{
private string message_;
private Position position_;
@disable this();
/**
* Params:
* message = Error text.
* position = Error position in the source text.
*/
this(string message, Position position) @nogc nothrow pure @safe
{
this.message_ = message;
this.position_ = position;
}
/// Error text.
@property string message() const @nogc nothrow pure @safe
{
return this.message_;
}
/// Error line in the source text.
@property size_t line() const @nogc nothrow pure @safe
{
return this.position_.line;
}
/// Error column in the source text.
@property size_t column() const @nogc nothrow pure @safe
{
return this.position_.column;
}
}
struct Result(T)
{
Nullable!CompileError error;
T result;
this(T result)
{
this.result = result;
this.error = typeof(this.error).init;
}
this(string message, Position position)
{
this.result = T.init;
this.error = CompileError(message, position);
}
this(CompileError compileError)
{
this.result = null;
this.error = compileError;
}
@disable this();
@property bool valid() const
{
return error.isNull;
}
}
struct Reference
{
enum Target
{
text,
high20,
lower12i
}
String name;
size_t offset;
Target target;
}
struct Symbol
{
String name;
Array!ubyte text;
Array!Reference symbols;
}

364
source/elna/riscv.d
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module elna.riscv;
import core.stdc.stdlib;
import elna.extended;
import elna.ir;
import elna.result;
import std.algorithm;
import std.typecons;
import tanya.container.array;
import tanya.container.string;
enum XRegister : ubyte
{
zero = 0,
ra = 1,
sp = 2,
gp = 3,
tp = 4,
t0 = 5,
t1 = 6,
t2 = 7,
s0 = 8,
s1 = 9,
a0 = 10,
a1 = 11,
a2 = 12,
a3 = 13,
a4 = 14,
a5 = 15,
a6 = 16,
a7 = 17,
s2 = 18,
s3 = 19,
s4 = 20,
s5 = 21,
s6 = 22,
s7 = 23,
s8 = 24,
s9 = 25,
s10 = 26,
s11 = 27,
t3 = 28,
t4 = 29,
t5 = 30,
t6 = 31,
}
enum Funct3 : ubyte
{
addi = 0b000,
slti = 0b001,
sltiu = 0b011,
andi = 0b111,
ori = 0b110,
xori = 0b100,
slli = 0b000,
srli = 0b101,
srai = 0b101,
add = 0b000,
slt = 0b010,
sltu = 0b011,
and = 0b111,
or = 0b110,
xor = 0b100,
sll = 0b001,
srl = 0b101,
sub = 0b000,
sra = 0b101,
beq = 0b000,
bne = 0b001,
blt = 0b100,
bltu = 0b110,
bge = 0b101,
bgeu = 0b111,
fence = 0b000,
fenceI = 0b001,
csrrw = 0b001,
csrrs = 0b010,
csrrc = 0b011,
csrrwi = 0b101,
csrrsi = 0b110,
csrrci = 0b111,
priv = 0b000,
sb = 0b000,
sh = 0b001,
sw = 0b010,
lb = 0b000,
lh = 0b001,
lw = 0b010,
lbu = 0b100,
lhu = 0b101,
jalr = 0b000,
}
enum Funct12 : ubyte
{
ecall = 0b000000000000,
ebreak = 0b000000000001,
}
enum Funct7 : ubyte
{
none = 0,
sub = 0b0100000
}
enum BaseOpcode : ubyte
{
opImm = 0b0010011,
lui = 0b0110111,
auipc = 0b0010111,
op = 0b0110011,
jal = 0b1101111,
jalr = 0b1100111,
branch = 0b1100011,
load = 0b0000011,
store = 0b0100011,
miscMem = 0b0001111,
system = 0b1110011,
}
struct Instruction
{
private uint instruction;
this(BaseOpcode opcode) @nogc
{
this.instruction = opcode;
}
@disable this();
ref Instruction i(XRegister rd, Funct3 funct3, XRegister rs1, uint immediate)
return scope @nogc
{
this.instruction |= (rd << 7)
| (funct3 << 12)
| (rs1 << 15)
| (immediate << 20);
return this;
}
ref Instruction s(uint imm1, Funct3 funct3, XRegister rs1, XRegister rs2)
return scope @nogc
{
this.instruction |= ((imm1 & 0b11111) << 7)
| (funct3 << 12)
| (rs1 << 15)
| (rs2 << 20)
| ((imm1 & 0b111111100000) << 20);
return this;
}
ref Instruction r(XRegister rd, Funct3 funct3, XRegister rs1, XRegister rs2, Funct7 funct7 = Funct7.none)
return scope @nogc
{
this.instruction |= (rd << 7)
| (funct3 << 12)
| (rs1 << 15)
| (rs2 << 20)
| (funct7 << 25);
return this;
}
ref Instruction u(XRegister rd, uint imm)
return scope @nogc
{
this.instruction |= (rd << 7) | (imm << 12);
return this;
}
ubyte[] encode() return scope @nogc
{
return (cast(ubyte*) (&this.instruction))[0 .. uint.sizeof];
}
}
extern(C++)
class RiscVVisitor : IRVisitor
{
Array!Instruction instructions;
bool registerInUse;
uint variableCounter = 1;
Array!Reference references;
override void visit(Node) @nogc
{
}
override void visit(Definition definition) @nogc
{
const uint stackSize = cast(uint) (definition.statements.length * 4 + 12);
// Prologue.
this.instructions.insertBack(
Instruction(BaseOpcode.opImm)
.i(XRegister.sp, Funct3.addi, XRegister.sp, -stackSize)
);
this.instructions.insertBack(
Instruction(BaseOpcode.store)
.s(stackSize - 4, Funct3.sw, XRegister.sp, XRegister.s0)
);
this.instructions.insertBack(
Instruction(BaseOpcode.store)
.s(stackSize - 8, Funct3.sw, XRegister.sp, XRegister.ra)
);
this.instructions.insertBack(
Instruction(BaseOpcode.opImm)
.i(XRegister.s0, Funct3.addi, XRegister.sp, stackSize)
);
foreach (statement; definition.statements[])
{
statement.accept(this);
}
foreach (variableDeclaration; definition.variableDeclarations[])
{
variableDeclaration.accept(this);
}
this.registerInUse = true;
definition.result.accept(this);
this.registerInUse = false;
// Print the result.
this.instructions.insertBack(
Instruction(BaseOpcode.opImm)
.i(XRegister.a1, Funct3.addi, XRegister.a0, 0)
);
this.references.insertBack(Reference(String(".CL0"), instructions.length * 4, Reference.Target.high20));
this.instructions.insertBack(
Instruction(BaseOpcode.lui).u(XRegister.a5, 0)
);
this.references.insertBack(Reference(String(".CL0"), instructions.length * 4, Reference.Target.lower12i));
this.instructions.insertBack(
Instruction(BaseOpcode.opImm).i(XRegister.a0, Funct3.addi, XRegister.a5, 0)
);
this.references.insertBack(Reference(String("printf"), instructions.length * 4, Reference.Target.text));
this.instructions.insertBack(
Instruction(BaseOpcode.auipc).u(XRegister.ra, 0)
);
this.instructions.insertBack(
Instruction(BaseOpcode.jalr)
.i(XRegister.ra, Funct3.jalr, XRegister.ra, 0)
);
// Set the return value (0).
this.instructions.insertBack(
Instruction(BaseOpcode.op)
.r(XRegister.a0, Funct3.and, XRegister.zero, XRegister.zero)
);
// Epilogue.
this.instructions.insertBack(
Instruction(BaseOpcode.load)
.i(XRegister.s0, Funct3.lw, XRegister.sp, stackSize - 4)
);
this.instructions.insertBack(
Instruction(BaseOpcode.load)
.i(XRegister.ra, Funct3.lw, XRegister.sp, stackSize - 8)
);
this.instructions.insertBack(
Instruction(BaseOpcode.opImm)
.i(XRegister.sp, Funct3.addi, XRegister.sp, stackSize)
);
this.instructions.insertBack(
Instruction(BaseOpcode.jalr)
.i(XRegister.zero, Funct3.jalr, XRegister.ra, 0)
);
}
override void visit(Operand operand) @nogc
{
if ((cast(Variable) operand) !is null)
{
return (cast(Variable) operand).accept(this);
}
if ((cast(Number) operand) !is null)
{
return (cast(Number) operand).accept(this);
}
}
override void visit(Variable variable) @nogc
{
const freeRegister = this.registerInUse ? XRegister.a0 : XRegister.t0;
// movl -x(%rbp), %eax; where x is a number.
this.instructions.insertBack(
Instruction(BaseOpcode.load)
.i(freeRegister, Funct3.lw, XRegister.sp,
cast(byte) (variable.counter * 4))
);
}
override void visit(VariableDeclaration) @nogc
{
}
override void visit(Number number) @nogc
{
const freeRegister = this.registerInUse ? XRegister.a0 : XRegister.t0;
this.instructions.insertBack(
Instruction(BaseOpcode.opImm) // movl $x, %eax; where $x is a number.
.i(freeRegister, Funct3.addi, XRegister.zero, number.value)
);
}
override void visit(BinaryExpression expression) @nogc
{
this.registerInUse = true;
expression.lhs.accept(this);
this.registerInUse = false;
expression.rhs.accept(this);
// Calculate the result and assign it to a variable on the stack.
final switch (expression.operator)
{
case BinaryOperator.sum:
this.instructions.insertBack(
Instruction(BaseOpcode.op)
.r(XRegister.a0, Funct3.add, XRegister.a0, XRegister.t0)
);
break;
case BinaryOperator.subtraction:
this.instructions.insertBack(
Instruction(BaseOpcode.op)
.r(XRegister.a0, Funct3.sub, XRegister.a0, XRegister.t0, Funct7.sub)
);
break;
}
this.instructions.insertBack( // movl %eax, -x(%rbp); where x is a number.
Instruction(BaseOpcode.store)
.s(cast(uint) (this.variableCounter * 4), Funct3.sw, XRegister.sp, XRegister.a0)
);
++this.variableCounter;
}
}
Symbol writeNext(Definition ast) @nogc
{
Array!Instruction instructions;
Array!Reference references;
auto visitor = cast(RiscVVisitor) malloc(__traits(classInstanceSize, RiscVVisitor));
(cast(void*) visitor)[0 .. __traits(classInstanceSize, RiscVVisitor)] = __traits(initSymbol, RiscVVisitor)[];
scope (exit)
{
visitor.__xdtor();
free(cast(void*) visitor);
}
visitor.visit(ast);
auto program = Symbol(String("main"));
program.symbols = move(visitor.references);
foreach (ref instruction; visitor.instructions)
{
program.text.insertBack(instruction.encode);
}
return program;
}

33
source/main.d
View File

@ -1,33 +0,0 @@
import elna.backend;
import elna.ir;
import elna.arguments;
import std.path;
import std.sumtype;
import tanya.container.string;
import tanya.memory.allocator;
import tanya.memory.mmappool;
int main(string[] args)
{
defaultAllocator = MmapPool.instance;
return Arguments.parse(args).match!(
(ArgumentError argumentError) => 4,
(Arguments arguments) {
String outputFilename;
if (arguments.output is null)
{
outputFilename = arguments
.inFile
.baseName
.withExtension("o");
}
else
{
outputFilename = String(arguments.output);
}
return generate(arguments.inFile, outputFilename);
}
);
}

1
tests/7_member_sum.eln
View File

@ -1 +0,0 @@
! 3 + 4 + 5 + 1 + 2 + 4 + 3

3
tests/const_list.eln
View File

@ -1,3 +0,0 @@
const a = 1, b = 2;
! a + b
.

1
tests/expectations/7_member_sum.txt
View File

@ -1 +0,0 @@
22

1
tests/expectations/const_list.txt
View File

@ -1 +0,0 @@
3

1
tests/expectations/left_nested_sum.txt
View File

@ -1 +0,0 @@
8

1
tests/expectations/print_number.txt
View File

@ -1 +0,0 @@
3

1
tests/expectations/subtraction.txt
View File

@ -1 +0,0 @@
1

1
tests/expectations/sum.txt
View File

@ -1 +0,0 @@
8

1
tests/expectations/sums.txt
View File

@ -1 +0,0 @@
8

2
tests/left_nested_sum.eln
View File

@ -1,2 +0,0 @@
! (3 + 4) + 1
.

2
tests/print_number.eln
View File

@ -1,2 +0,0 @@
! 3
.

37
tests/runner.cpp
View File

@ -1,37 +1,32 @@
#include <boost/process.hpp>
#include <iostream>
#include <filesystem>
#include <iostream>
#include "elna/tester.hpp"
class test_results final
namespace elna
{
std::uint32_t m_total{ 0 };
std::uint32_t m_passed{ 0 };
public:
test_results() = default;
std::uint32_t total() const noexcept
std::uint32_t test_results::total() const noexcept
{
return m_total;
}
std::uint32_t passed() const noexcept
std::uint32_t test_results::passed() const noexcept
{
return m_passed;
}
std::uint32_t failed() const noexcept
std::uint32_t test_results::failed() const noexcept
{
return m_total - m_passed;
}
int exit_code() const noexcept
int test_results::exit_code() const noexcept
{
return m_total == m_passed ? EXIT_SUCCESS : EXIT_FAILURE;
}
void add_exit_code(const int exit_code) noexcept
void test_results::add_exit_code(const int exit_code) noexcept
{
++m_total;
if (exit_code == 0)
@ -39,10 +34,9 @@ public:
++m_passed;
}
}
};
int run_test(const std::filesystem::directory_entry& test_entry)
{
static int run_test(const std::filesystem::directory_entry& test_entry)
{
const std::filesystem::path test_filename = test_entry.path().filename();
std::filesystem::path test_binary = "build/riscv" / test_filename;
@ -69,10 +63,10 @@ int run_test(const std::filesystem::directory_entry& test_entry)
diff.wait();
return diff.exit_code();
}
}
test_results run_in_path(const std::filesystem::path test_directory)
{
static test_results run_in_path(const std::filesystem::path test_directory)
{
test_results results;
for (const auto& test_entry : std::filesystem::directory_iterator(test_directory))
@ -84,7 +78,8 @@ test_results run_in_path(const std::filesystem::path test_directory)
results.add_exit_code(run_test(test_entry));
}
return results;
}
}
};
int main()
{
@ -92,7 +87,7 @@ int main()
std::cout << "Run all tests and check the results" << std::endl;
std::filesystem::path test_directory{ "tests" };
const auto results = run_in_path(test_directory);
const auto results = elna::run_in_path(test_directory);
std::cout << std::endl;
std::cout << results.total() << " tests run, "

2
tests/subtraction.eln
View File

@ -1,2 +0,0 @@
! 5 - 4
.

2
tests/sum.eln
View File

@ -1,2 +0,0 @@
! 1 + 7
.

2
tests/sums.eln
View File

@ -1,2 +0,0 @@
! 1 + (3 + 4)
.