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Interpretation of Sections 15 and 16. + + If the disclaimer of warranty and limitation of liability provided +above cannot be given local legal effect according to their terms, +reviewing courts shall apply local law that most closely approximates +an absolute waiver of all civil liability in connection with the +Program, unless a warranty or assumption of liability accompanies a +copy of the Program in return for a fee. + + END OF TERMS AND CONDITIONS + + How to Apply These Terms to Your New Programs + + If you develop a new program, and you want it to be of the greatest +possible use to the public, the best way to achieve this is to make it +free software which everyone can redistribute and change under these terms. + + To do so, attach the following notices to the program. It is safest +to attach them to the start of each source file to most effectively +state the exclusion of warranty; and each file should have at least +the "copyright" line and a pointer to where the full notice is found. + + A edlang programming language compiler. + Copyright (C) 2023 Edgar Luque + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU Affero General Public License as published + by the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU Affero General Public License for more details. + + You should have received a copy of the GNU Affero General Public License + along with this program. If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If your software can interact with users remotely through a computer +network, you should also make sure that it provides a way for users to +get its source. For example, if your program is a web application, its +interface could display a "Source" link that leads users to an archive +of the code. There are many ways you could offer source, and different +solutions will be better for different programs; see section 13 for the +specific requirements. + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU AGPL, see +. diff --git a/README.md b/README.md new file mode 100644 index 000000000..fa18d4327 --- /dev/null +++ b/README.md @@ -0,0 +1,16 @@ +# edlang + +A toy language I'm making to learn LLVM and compilers. + +Syntax is subject to change any time right now. It has a rusty style for now. + +``` +fn add(a: i64, b: i64) -> i64 { + return a + b; +} + +fn main() { + let x = 2 + 3; + let y = add(x, 4); +} +``` diff --git a/build.rs b/build.rs new file mode 100644 index 000000000..ca5c2836d --- /dev/null +++ b/build.rs @@ -0,0 +1,3 @@ +fn main() { + lalrpop::process_root().unwrap(); +} diff --git a/example.ed b/example.ed new file mode 100644 index 000000000..75b4d0b5c --- /dev/null +++ b/example.ed @@ -0,0 +1,9 @@ +let x = 2; +fn add(a: i64, b: i64) -> i64 { + return a + b; +} + +fn main() { + let x = 2 + 3; + let y = add(x, 4); +} diff --git a/src/ast/function.rs b/src/ast/function.rs new file mode 100644 index 000000000..a59e28f26 --- /dev/null +++ b/src/ast/function.rs @@ -0,0 +1,37 @@ +use super::{Identifier, SpanValue, Statement}; + +#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)] +pub struct Parameter { + pub ident: Identifier, + pub type_name: Identifier, +} + +impl Parameter { + pub fn new(ident: Identifier, type_name: Identifier) -> Self { + Self { ident, type_name } + } +} + +#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)] +pub struct Function { + pub ident: Identifier, + pub params: Vec, + pub body: Vec>, + pub return_type: Option, +} + +impl Function { + pub fn new( + ident: Identifier, + params: Vec, + body: Vec>, + return_type: Option, + ) -> Self { + Self { + ident, + params, + body, + return_type, + } + } +} diff --git a/src/ast/mod.rs b/src/ast/mod.rs new file mode 100644 index 000000000..0f27e3e09 --- /dev/null +++ b/src/ast/mod.rs @@ -0,0 +1,68 @@ +pub mod function; +pub mod span; +pub mod statement; + +pub use function::*; +pub use span::*; +pub use statement::*; + +#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)] +pub enum OpCode { + Add, + Sub, + Mul, + Div, + Rem, +} + +impl OpCode { + pub fn to_str(&self) -> &'static str { + match self { + OpCode::Add => "addi", + OpCode::Sub => "subi", + OpCode::Mul => "muli", + OpCode::Div => "divi", + OpCode::Rem => "remi", + } + } +} + +#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)] +pub struct Identifier(pub SpanValue); + +#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)] +pub struct Number(pub SpanValue); + +#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)] +pub enum Term { + Identifier(Identifier), + Number(Number), +} + +#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)] +pub enum Expr { + Term(Term), + Call(Identifier, Vec>>), + Op(SpanValue>, OpCode, SpanValue>), +} + +impl Expr { + pub fn new_ident(value: Identifier) -> Self { + Self::Term(Term::Identifier(value)) + } + + pub fn new_number(value: Number) -> Self { + Self::Term(Term::Number(value)) + } +} + +#[derive(Debug, Clone)] +pub struct Program { + pub statements: Vec>, +} + +impl Program { + pub fn new(statements: Vec>) -> Self { + Self { statements } + } +} diff --git a/src/ast/span.rs b/src/ast/span.rs new file mode 100644 index 000000000..c74efdf06 --- /dev/null +++ b/src/ast/span.rs @@ -0,0 +1,32 @@ +#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)] +pub struct Span { + pub from: usize, + pub to: usize, +} + +impl Span { + pub fn new(from: usize, to: usize) -> Self { + Self { from, to } + } +} + +#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)] +pub struct SpanValue { + pub span: Span, + pub value: T, +} + +impl SpanValue { + pub fn new(l: usize, value: T, r: usize) -> Self { + Self { + span: Span::new(l, r), + value, + } + } +} + +impl From for (usize, usize) { + fn from(value: Span) -> Self { + (value.from, value.to) + } +} diff --git a/src/ast/statement.rs b/src/ast/statement.rs new file mode 100644 index 000000000..e4b0ffb58 --- /dev/null +++ b/src/ast/statement.rs @@ -0,0 +1,29 @@ +use super::{Expr, Function, Identifier, SpanValue}; + +#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)] +pub struct StatementBody { + pub ident: Identifier, + pub expr: SpanValue>, +} + +#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)] +pub enum Statement { + Assignment(StatementBody), + Definition(StatementBody), + Return(SpanValue>), + Function(Function), +} + +impl Statement { + pub fn new_assignment(ident: Identifier, expr: SpanValue>) -> Self { + Self::Assignment(StatementBody { ident, expr }) + } + + pub fn new_definition(ident: Identifier, expr: SpanValue>) -> Self { + Self::Definition(StatementBody { ident, expr }) + } + + pub fn new_function(func: Function) -> Self { + Self::Function(func) + } +} diff --git a/src/check.rs b/src/check.rs new file mode 100644 index 000000000..226aaeba6 --- /dev/null +++ b/src/check.rs @@ -0,0 +1,60 @@ +use crate::{ + ast::{self, Statement}, + codegen::ProgramData, +}; +use annotate_snippets::{ + display_list::{DisplayList, FormatOptions}, + snippet::{Annotation, AnnotationType, Slice, Snippet, SourceAnnotation}, +}; + +#[derive(Debug)] +pub enum Check<'a> { + Warning(DisplayList<'a>), + Error(DisplayList<'a>), +} + +/// Checks this is a valid edlang program. +pub fn check<'a>(data: &'a ProgramData, ast: &ast::Program) -> Vec> { + let mut errors = vec![]; + + for statement in &ast.statements { + match &statement.value { + Statement::Assignment(_x) => { + // can't have a top level assignment yet. + let snippet = Snippet { + title: Some(Annotation { + id: None, + label: Some("unexpected assignment at top level"), + annotation_type: AnnotationType::Error, + }), + footer: vec![], + slices: vec![Slice { + source: &data.source, + line_start: 1, + fold: true, + origin: Some(&data.filename), + annotations: vec![ + SourceAnnotation { + label: "unexpected statement", + annotation_type: AnnotationType::Error, + range: statement.span.into(), + }, + ], + }], + opt: FormatOptions { + color: true, + ..Default::default() + }, + }; + + let dl = DisplayList::from(snippet); + errors.push(Check::Error(dl)); + } + Statement::Definition(_) => todo!(), + Statement::Return(_) => unreachable!(), + Statement::Function(_function) => {} + } + } + + errors +} diff --git a/src/codegen.rs b/src/codegen.rs new file mode 100644 index 000000000..76aa946f7 --- /dev/null +++ b/src/codegen.rs @@ -0,0 +1,277 @@ +use std::collections::HashMap; + +use color_eyre::Result; +use inkwell::{ + basic_block::BasicBlock, + builder::Builder, + context::Context, + module::Module, + types::{BasicMetadataTypeEnum, BasicType, BasicTypeEnum}, + values::{BasicMetadataValueEnum, BasicValue, BasicValueEnum}, +}; +use itertools::{Either, Itertools}; + +use statement::Statement; + +use crate::ast::{self, statement, Expr, Function, Identifier, OpCode, SpanValue, Term}; + +#[derive(Debug, Clone)] +pub struct ProgramData { + pub filename: String, + pub source: String, +} + +impl ProgramData { + pub fn new(filename: &str, source: &str) -> Self { + Self { + filename: filename.to_string(), + source: source.to_string(), + } + } +} + +pub struct CodeGen<'ctx> { + context: &'ctx Context, + pub module: Module<'ctx>, + builder: Builder<'ctx>, + _program: ProgramData, + ast: ast::Program, +} + +impl<'ctx> CodeGen<'ctx> { + pub fn new( + context: &'ctx Context, + module_name: &str, + _program: ProgramData, + ast: ast::Program, + ) -> Result { + let module = context.create_module(module_name); + + let codegen = CodeGen { + context, + module, + builder: context.create_builder(), + _program, + ast, + }; + + Ok(codegen) + } + + pub fn compile_ast(&self) -> Result<()> { + let mut functions = vec![]; + + // todo fix the grammar so top level statements are only functions and static vars. + + // create the llvm functions first. + for statement in &self.ast.statements { + match &statement.value { + Statement::Assignment(_) => unreachable!(), + Statement::Definition(_) => todo!(), + Statement::Return(_) => unreachable!(), + Statement::Function(function) => { + functions.push(function); + self.compile_function_signature(function)?; + } + } + } + + // implement them. + for function in functions { + self.compile_function(function)?; + } + + Ok(()) + } + + pub fn generated_code(&self) -> String { + if let Err(err) = self.module.verify() { + eprintln!("error:\n{}", err); + } + self.module.print_to_string().to_str().unwrap().to_string() + } + + fn get_llvm_type(&self, id: &str) -> Result> { + Ok(match id { + "i64" => self.context.i64_type().as_basic_type_enum(), + "i32" => self.context.i32_type().as_basic_type_enum(), + "i8" => self.context.i8_type().as_basic_type_enum(), + "u8" => self.context.i8_type().as_basic_type_enum(), + _ => todo!(), + }) + } + + /// creates the llvm function without the body, so other function bodies can call it. + fn compile_function_signature(&self, function: &Function) -> Result<()> { + let args_types: Vec> = function + .params + .iter() + .map(|param| param.type_name.0.value.as_str()) + .map(|t| self.get_llvm_type(t)) + .try_collect()?; + + let args_types: Vec> = + args_types.into_iter().map(|t| t.into()).collect_vec(); + + let fn_type = match &function.return_type { + Some(id) => self.get_llvm_type(&id.0.value)?.fn_type(&args_types, false), + None => self.context.void_type().fn_type(&args_types, false), + }; + + self.module + .add_function(&function.ident.0.value, fn_type, None); + + Ok(()) + } + + fn compile_function(&self, function: &Function) -> Result<()> { + let func = self.module.get_function(&function.ident.0.value).unwrap(); + let entry_block = self.context.append_basic_block(func, "entry"); + + self.builder.position_at_end(entry_block); + + let mut variables: HashMap> = HashMap::new(); + + for (i, param) in function.params.iter().enumerate() { + let id = param.ident.clone(); + variables.insert( + id.0.value.clone(), + func.get_nth_param(i.try_into().unwrap()) + .expect("parameter"), + ); + } + + // todo: check function has return? + for statement in &function.body { + self.compile_statement(&entry_block, statement, &mut variables)?; + } + + if function.return_type.is_none() { + self.builder.build_return(None); + } + + Ok(()) + } + + fn compile_statement( + &self, + block: &BasicBlock, + statement: &SpanValue, + variables: &mut HashMap>, + ) -> Result<()> { + match &statement.value { + // Variable assignment + Statement::Assignment(body) => { + let result = self + .compile_expression(block, &body.expr, variables)? + .expect("should have result"); + + variables.insert(body.ident.0.value.clone(), result); + } + Statement::Definition(body) => { + let result = self + .compile_expression(block, &body.expr, variables)? + .expect("should have result"); + + variables.insert(body.ident.0.value.clone(), result); + } + Statement::Return(ret) => { + let result = self + .compile_expression(block, ret, variables)? + .expect("should have result"); + self.builder.build_return(Some(&result)); + } + Statement::Function(_function) => unreachable!(), + }; + + Ok(()) + } + + pub fn compile_expression( + &self, + block: &BasicBlock, + expr: &SpanValue>, + variables: &mut HashMap>, + ) -> Result>> { + Ok(match &*expr.value { + Expr::Term(term) => Some(self.compile_term(term, variables)?), + Expr::Call(func_id, args) => self.compile_call(block, func_id, args, variables)?, + Expr::Op(lhs, op, rhs) => Some(self.compile_op(block, lhs, op, rhs, variables)?), + }) + } + + pub fn compile_call( + &self, + block: &BasicBlock, + func_id: &Identifier, + args: &[SpanValue>], + variables: &mut HashMap>, + ) -> Result>> { + let func_name = &func_id.0.value; + let function = self.module.get_function(func_name).expect("should exist"); + + let mut value_args: Vec = Vec::with_capacity(args.len()); + + for arg in args { + let res = self + .compile_expression(block, arg, variables)? + .expect("should have result"); + value_args.push(res.into()); + } + + let result = self + .builder + .build_call(function, &value_args, &format!("{func_name}_call")) + .try_as_basic_value(); + + Ok(match result { + Either::Left(val) => Some(val), + Either::Right(_) => None, + }) + } + + pub fn compile_op( + &self, + block: &BasicBlock, + lhs: &SpanValue>, + op: &OpCode, + rhs: &SpanValue>, + variables: &mut HashMap>, + ) -> Result> { + let lhs = self + .compile_expression(block, lhs, variables)? + .expect("should have result") + .into_int_value(); + let rhs = self + .compile_expression(block, rhs, variables)? + .expect("should have result") + .into_int_value(); + + let result = match op { + OpCode::Add => self.builder.build_int_add(lhs, rhs, "add"), + OpCode::Sub => self.builder.build_int_sub(lhs, rhs, "sub"), + OpCode::Mul => self.builder.build_int_mul(lhs, rhs, "mul"), + OpCode::Div => self.builder.build_int_signed_div(lhs, rhs, "div"), + OpCode::Rem => self.builder.build_int_signed_rem(lhs, rhs, "rem"), + }; + + Ok(result.as_basic_value_enum()) + } + + pub fn compile_term( + &self, + term: &Term, + variables: &mut HashMap>, + ) -> Result> { + let value = match term { + Term::Identifier(ident) => *variables.get(&ident.0.value).expect("value"), + Term::Number(num) => self + .context + .i64_type() + .const_int(num.0.value.try_into()?, true) + .as_basic_value_enum(), + }; + + Ok(value) + } +} diff --git a/src/grammar.lalrpop b/src/grammar.lalrpop new file mode 100644 index 000000000..9ff31afa4 --- /dev/null +++ b/src/grammar.lalrpop @@ -0,0 +1,86 @@ +use std::str::FromStr; +use crate::ast::*; + +grammar; + +Comma: Vec = { + ",")*> => match e { + None => v, + Some(e) => { + v.push(e); + v + } + } +}; + +ExprOp: OpCode = { + "+" => OpCode::Add, + "-" => OpCode::Sub, +}; + +FactorOp: OpCode = { + "*" => OpCode::Mul, + "/" => OpCode::Div, + "%" => OpCode::Rem, +} + +Tier: SpanValue> = { + > => SpanValue::new(l, Box::new(Expr::Op(t, o, n)), r), + NextTier +}; + +Expr = Tier; +Factor = Tier; + +// Terms: variables, literals, calls +Term: SpanValue> = { + => SpanValue::new(l, Box::new(Expr::new_ident(i)), r), + => SpanValue::new(l, Box::new(Expr::new_number(n)), r), + "(" > ")" => SpanValue::new(l, Box::new(Expr::Call(i, values)), r), + "(" ")" +}; + +Identifier: Identifier = { + => Identifier(SpanValue::new(l, i.to_owned(), r)), +}; + +Num: Number = => Number(SpanValue::new(l, i64::from_str(n).unwrap(), r)); + +// Function handling +Param: Parameter = { + ":" => Parameter::new(<>) +}; + +Params = Comma; + +FunctionReturn: Identifier = { + "->" => i, +} + +Function: Function = { + "fn" "(" ")" "{" "}" => Function::new(i, a, s, r) +} + +// statements not including function definitions +BasicStatement: SpanValue = { + "let" "=" ";" => SpanValue::new(l, Statement::new_assignment(i, e), r), + "=" ";" => SpanValue::new(l, Statement::new_definition(i, e), r), + "return" ";" => SpanValue::new(l, Statement::Return(e), r), +}; + +Statement: SpanValue = { + BasicStatement, + => SpanValue::new(l, Statement::new_function(f), r), +}; + +Statements: Vec> = { + Statement => vec![<>], + => { + s.push(n); + s + }, +}; + +pub Program: Program = { + Statements => Program::new(<>) +} diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 000000000..669dd2203 --- /dev/null +++ b/src/main.rs @@ -0,0 +1,155 @@ +#![allow(clippy::too_many_arguments)] + +use check::Check; +use clap::{Parser, Subcommand}; +use color_eyre::Result; +use inkwell::{context::Context, execution_engine::JitFunction, OptimizationLevel}; +use lalrpop_util::lalrpop_mod; +use std::{fs, path::PathBuf}; + +use crate::codegen::ProgramData; + +pub mod ast; +pub mod check; +pub mod codegen; + +lalrpop_mod!(pub grammar); + +#[derive(Parser)] +#[command( + author, + version, + about, + long_about = r#"A experimental language using LLVM."# +)] +struct Args { + #[command(subcommand)] + command: Commands, +} + +#[derive(Subcommand)] +enum Commands { + /// Check if the code is valid. + Check { + /// The input file. + input: PathBuf, + }, + /// Compile the edlang source file. + Compile { + /// The input file. + input: PathBuf, + + /// Output optimized llvm ir. + #[arg(short, long)] + optimize: bool, + + /// The output file. If not specified its output will be stdout. + #[arg(short, long)] + output: Option, + + /// Turn on debug info. + #[arg(short, long)] + debug: bool, + }, + /// Compile and run a program. Main needs to return nothing. + Run { + /// The input file. + input: PathBuf, + }, +} + +fn check_program(program: &ProgramData, ast: &ast::Program) -> bool { + let errors = check::check(program, ast); + + let mut error_count = 0; + let mut warn_count = 0; + for error in errors { + match error { + Check::Warning(x) => { + warn_count += 1; + println!("{}", x) + } + Check::Error(x) => { + error_count += 1; + println!("{}", x) + } + } + } + + println!("Warnings: {warn_count}"); + println!("Errors: {error_count}"); + + error_count == 0 +} + +fn main() -> Result<()> { + color_eyre::install()?; + tracing_subscriber::fmt::init(); + let args = Args::parse(); + + match args.command { + Commands::Check { input } => { + let code = fs::read_to_string(&input)?; + + let parser = grammar::ProgramParser::new(); + let ast = parser.parse(&code).unwrap(); + + let str_path = input.to_string_lossy(); + let program = ProgramData::new(&str_path, &code); + check_program(&program, &ast); + } + Commands::Compile { input, output, debug: _, optimize: _ } => { + let code = fs::read_to_string(&input)?; + + let parser = grammar::ProgramParser::new(); + let ast = parser.parse(&code).unwrap(); + + let str_path = input.to_string_lossy(); + let program = ProgramData::new(&str_path, &code); + + let file_name = input.file_name().unwrap().to_string_lossy(); + + if !check_program(&program, &ast) { + return Ok(()); + } + + let context = Context::create(); + let codegen = codegen::CodeGen::new(&context, &file_name, program, ast)?; + codegen.compile_ast()?; + let generated_llvm_ir = codegen.generated_code(); + + if let Some(output) = output { + fs::write(output, generated_llvm_ir)?; + } else { + println!("{generated_llvm_ir}"); + } + } + Commands::Run { input } => { + let code = fs::read_to_string(&input)?; + + let parser = grammar::ProgramParser::new(); + let ast = parser.parse(&code).unwrap(); + + let str_path = input.to_string_lossy(); + let program = ProgramData::new(&str_path, &code); + + let file_name = input.file_name().unwrap().to_string_lossy(); + + let context = Context::create(); + let codegen = codegen::CodeGen::new(&context, &file_name, program, ast)?; + codegen.compile_ast()?; + let execution_engine = codegen + .module + .create_jit_execution_engine(OptimizationLevel::Aggressive) + .unwrap(); + + unsafe { + let main: JitFunction ()> = + execution_engine.get_function("main")?; + main.call(); + }; + } + } + + Ok(()) +}