321 lines
8.5 KiB
Rust
321 lines
8.5 KiB
Rust
//! This module contains relevant code for [`Pass`] and shared code between
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//! passes. Passes can be performed on Reid MIR to e.g. typecheck the code.
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use std::collections::HashMap;
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use std::convert::Infallible;
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use std::error::Error as STDError;
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use super::*;
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#[derive(thiserror::Error, Debug, Clone)]
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pub enum SimplePassError {
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#[error("Function not defined: {0}")]
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FunctionAlreadyDefined(String),
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#[error("Variable not defined: {0}")]
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VariableAlreadyDefined(String),
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}
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#[derive(Debug, Clone)]
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pub struct Error<TErr: STDError> {
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metadata: Metadata,
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kind: TErr,
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}
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impl<TErr: STDError> std::fmt::Display for Error<TErr> {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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write!(f, "Error at {}: {}", self.metadata, self.kind)
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}
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}
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impl<TErr: STDError> STDError for Error<TErr> {
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fn source(&self) -> Option<&(dyn STDError + 'static)> {
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self.kind.source()
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}
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}
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#[derive(Clone, Debug)]
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pub struct Storage<T: std::fmt::Debug>(HashMap<String, T>);
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#[derive(Debug)]
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pub struct State<TErr: STDError> {
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pub errors: Vec<Error<TErr>>,
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}
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impl<TErr: STDError> State<TErr> {
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fn new() -> State<TErr> {
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State {
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errors: Default::default(),
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}
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}
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fn or_else<U, T: Into<Metadata> + Clone + Copy>(
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&mut self,
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result: Result<U, TErr>,
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default: U,
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meta: T,
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) -> U {
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match result {
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Ok(t) => t,
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Err(e) => {
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self.errors.push(Error {
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metadata: meta.into(),
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kind: e,
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});
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default
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}
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}
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}
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fn ok<T: Into<Metadata> + Clone + Copy, U>(
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&mut self,
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result: Result<U, TErr>,
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meta: T,
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) -> Option<U> {
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match result {
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Ok(v) => Some(v),
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Err(e) => {
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self.errors.push(Error {
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metadata: meta.into(),
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kind: e,
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});
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None
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}
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}
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}
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}
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impl<T: std::fmt::Debug> Default for Storage<T> {
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fn default() -> Self {
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Self(Default::default())
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}
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}
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impl<T: Clone + std::fmt::Debug> Storage<T> {
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pub fn set(&mut self, key: String, value: T) -> Result<T, ()> {
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if let Some(_) = self.0.get(&key) {
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Err(())
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} else {
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self.0.insert(key, value.clone());
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Ok(value)
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}
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}
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pub fn get(&self, key: &String) -> Option<&T> {
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self.0.get(key)
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}
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}
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#[derive(Clone, Default, Debug)]
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pub struct Scope {
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pub function_returns: Storage<ScopeFunction>,
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pub variables: Storage<ScopeVariable>,
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/// Hard Return type of this scope, if inside a function
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pub return_type_hint: Option<TypeKind>,
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}
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#[derive(Clone, Debug)]
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pub struct ScopeFunction {
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pub ret: TypeKind,
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pub params: Vec<TypeKind>,
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}
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#[derive(Clone, Debug)]
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pub struct ScopeVariable {
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pub ty: TypeKind,
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pub mutable: bool,
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}
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impl Scope {
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pub fn inner(&self) -> Scope {
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Scope {
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function_returns: self.function_returns.clone(),
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variables: self.variables.clone(),
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return_type_hint: self.return_type_hint.clone(),
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}
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}
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}
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pub struct PassState<'st, 'sc, TError: STDError + Clone> {
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state: &'st mut State<TError>,
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pub scope: &'sc mut Scope,
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inner: Vec<Scope>,
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}
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impl<'st, 'sc, TError: STDError + Clone> PassState<'st, 'sc, TError> {
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fn from(state: &'st mut State<TError>, scope: &'sc mut Scope) -> Self {
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PassState {
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state,
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scope,
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inner: Vec::new(),
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}
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}
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pub fn or_else<U, TMeta: Into<Metadata> + Clone + Copy>(
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&mut self,
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result: Result<U, TError>,
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default: U,
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meta: TMeta,
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) -> U {
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self.state.or_else(result, default, meta)
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}
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pub fn ok<TMeta: Into<Metadata> + Clone + Copy, U>(
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&mut self,
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result: Result<U, TError>,
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meta: TMeta,
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) -> Option<U> {
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self.state.ok(result, meta)
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}
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pub fn note_errors<TMeta: Into<Metadata> + Clone>(
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&mut self,
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errors: &Vec<TError>,
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meta: TMeta,
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) {
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for error in errors {
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self.ok::<_, Infallible>(Err(error.clone()), meta.clone().into());
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}
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}
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pub fn inner(&mut self) -> PassState<TError> {
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self.inner.push(self.scope.inner());
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let scope = self.inner.last_mut().unwrap();
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PassState {
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state: self.state,
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scope,
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inner: Vec::new(),
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}
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}
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}
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pub trait Pass {
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type TError: STDError + Clone;
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fn module(&mut self, _module: &mut Module, mut _state: PassState<Self::TError>) {}
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fn function(
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&mut self,
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_function: &mut FunctionDefinition,
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mut _state: PassState<Self::TError>,
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) {
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}
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fn block(&mut self, _block: &mut Block, mut _state: PassState<Self::TError>) {}
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fn stmt(&mut self, _stmt: &mut Statement, mut _state: PassState<Self::TError>) {}
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fn expr(&mut self, _expr: &mut Expression, mut _state: PassState<Self::TError>) {}
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}
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impl Context {
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pub fn pass<T: Pass>(&mut self, pass: &mut T) -> State<T::TError> {
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let mut state = State::new();
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let mut scope = Scope::default();
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for module in &mut self.modules {
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module.pass(pass, &mut state, &mut scope);
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}
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state
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}
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}
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impl Module {
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fn pass<T: Pass>(&mut self, pass: &mut T, state: &mut State<T::TError>, scope: &mut Scope) {
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for function in &self.functions {
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scope
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.function_returns
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.set(
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function.name.clone(),
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ScopeFunction {
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ret: function.return_type.clone(),
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params: function.parameters.iter().cloned().map(|v| v.1).collect(),
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},
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)
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.ok();
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}
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pass.module(self, PassState::from(state, scope));
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for function in &mut self.functions {
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function.pass(pass, state, scope);
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}
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}
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}
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impl FunctionDefinition {
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fn pass<T: Pass>(&mut self, pass: &mut T, state: &mut State<T::TError>, scope: &mut Scope) {
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for param in &self.parameters {
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scope
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.variables
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.set(
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param.0.clone(),
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ScopeVariable {
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ty: param.1.clone(),
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mutable: false,
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},
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)
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.ok();
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}
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pass.function(self, PassState::from(state, scope));
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match &mut self.kind {
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FunctionDefinitionKind::Local(block, _) => {
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scope.return_type_hint = Some(self.return_type.clone());
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block.pass(pass, state, scope);
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}
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FunctionDefinitionKind::Extern => {}
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};
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}
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}
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impl Block {
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fn pass<T: Pass>(&mut self, pass: &mut T, state: &mut State<T::TError>, scope: &mut Scope) {
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let mut scope = scope.inner();
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for statement in &mut self.statements {
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statement.pass(pass, state, &mut scope);
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}
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pass.block(self, PassState::from(state, &mut scope));
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}
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}
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impl Statement {
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fn pass<T: Pass>(&mut self, pass: &mut T, state: &mut State<T::TError>, scope: &mut Scope) {
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match &mut self.0 {
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StmtKind::Let(_, _, expression) => {
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expression.pass(pass, state, scope);
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}
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StmtKind::Set(_, expression) => {
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expression.pass(pass, state, scope);
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}
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StmtKind::Import(_) => todo!(),
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StmtKind::Expression(expression) => {
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expression.pass(pass, state, scope);
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}
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}
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pass.stmt(self, PassState::from(state, scope));
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match &mut self.0 {
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StmtKind::Let(variable_reference, mutable, _) => {
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scope
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.variables
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.set(
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variable_reference.1.clone(),
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ScopeVariable {
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ty: variable_reference.0.clone(),
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mutable: *mutable,
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},
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)
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.ok();
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}
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StmtKind::Set(_, _) => {}
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StmtKind::Import(_) => todo!(),
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StmtKind::Expression(_) => {}
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};
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}
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}
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impl Expression {
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fn pass<T: Pass>(&mut self, pass: &mut T, state: &mut State<T::TError>, scope: &mut Scope) {
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pass.expr(self, PassState::from(state, scope));
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}
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}
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