nac3/nac3core/src/symbol_resolver.rs

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use std::collections::HashMap;
use std::fmt::Debug;
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use std::{cell::RefCell, sync::Arc};
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use crate::{
codegen::CodeGenContext,
toplevel::{DefinitionId, TopLevelDef},
};
use crate::{
codegen::CodeGenerator,
typecheck::{
type_inferencer::PrimitiveStore,
typedef::{Type, Unifier},
},
};
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use crate::{location::Location, typecheck::typedef::TypeEnum};
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use inkwell::values::{BasicValueEnum, FloatValue, IntValue, PointerValue};
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use itertools::{chain, izip};
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use nac3parser::ast::{Expr, StrRef};
use parking_lot::RwLock;
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#[derive(Clone, PartialEq, Debug)]
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pub enum SymbolValue {
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I32(i32),
I64(i64),
Str(String),
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Double(f64),
Bool(bool),
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Tuple(Vec<SymbolValue>),
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}
pub trait StaticValue {
fn get_unique_identifier(&self) -> u64;
fn to_basic_value_enum<'ctx, 'a>(
&self,
ctx: &mut CodeGenContext<'ctx, 'a>,
generator: &mut dyn CodeGenerator
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) -> BasicValueEnum<'ctx>;
fn get_field<'ctx, 'a>(
&self,
name: StrRef,
ctx: &mut CodeGenContext<'ctx, 'a>,
) -> Option<ValueEnum<'ctx>>;
}
#[derive(Clone)]
pub enum ValueEnum<'ctx> {
Static(Arc<dyn StaticValue + Send + Sync>),
Dynamic(BasicValueEnum<'ctx>),
}
impl<'ctx> From<BasicValueEnum<'ctx>> for ValueEnum<'ctx> {
fn from(v: BasicValueEnum<'ctx>) -> Self {
ValueEnum::Dynamic(v)
}
}
impl<'ctx> From<PointerValue<'ctx>> for ValueEnum<'ctx> {
fn from(v: PointerValue<'ctx>) -> Self {
ValueEnum::Dynamic(v.into())
}
}
impl<'ctx> From<IntValue<'ctx>> for ValueEnum<'ctx> {
fn from(v: IntValue<'ctx>) -> Self {
ValueEnum::Dynamic(v.into())
}
}
impl<'ctx> From<FloatValue<'ctx>> for ValueEnum<'ctx> {
fn from(v: FloatValue<'ctx>) -> Self {
ValueEnum::Dynamic(v.into())
}
}
impl<'ctx> ValueEnum<'ctx> {
pub fn to_basic_value_enum<'a>(
self,
ctx: &mut CodeGenContext<'ctx, 'a>,
generator: &mut dyn CodeGenerator,
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) -> BasicValueEnum<'ctx> {
match self {
ValueEnum::Static(v) => v.to_basic_value_enum(ctx, generator),
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ValueEnum::Dynamic(v) => v,
}
}
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}
pub trait SymbolResolver {
// get type of type variable identifier or top-level function type
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fn get_symbol_type(
&self,
unifier: &mut Unifier,
top_level_defs: &[Arc<RwLock<TopLevelDef>>],
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primitives: &PrimitiveStore,
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str: StrRef,
) -> Result<Type, String>;
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// get the top-level definition of identifiers
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fn get_identifier_def(&self, str: StrRef) -> Option<DefinitionId>;
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fn get_symbol_value<'ctx, 'a>(
&self,
str: StrRef,
ctx: &mut CodeGenContext<'ctx, 'a>,
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) -> Option<ValueEnum<'ctx>>;
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fn get_symbol_location(&self, str: StrRef) -> Option<Location>;
fn get_default_param_value(&self, expr: &nac3parser::ast::Expr) -> Option<SymbolValue>;
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// handle function call etc.
}
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thread_local! {
static IDENTIFIER_ID: [StrRef; 10] = [
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"int32".into(),
"int64".into(),
"float".into(),
"bool".into(),
"None".into(),
"virtual".into(),
"list".into(),
"tuple".into(),
"str".into(),
"Exception".into(),
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];
}
// convert type annotation into type
pub fn parse_type_annotation<T>(
resolver: &dyn SymbolResolver,
top_level_defs: &[Arc<RwLock<TopLevelDef>>],
unifier: &mut Unifier,
primitives: &PrimitiveStore,
expr: &Expr<T>,
) -> Result<Type, String> {
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use nac3parser::ast::ExprKind::*;
let ids = IDENTIFIER_ID.with(|ids| *ids);
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let int32_id = ids[0];
let int64_id = ids[1];
let float_id = ids[2];
let bool_id = ids[3];
let none_id = ids[4];
let virtual_id = ids[5];
let list_id = ids[6];
let tuple_id = ids[7];
let str_id = ids[8];
let exn_id = ids[9];
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let name_handling = |id: &StrRef, unifier: &mut Unifier| {
if *id == int32_id {
Ok(primitives.int32)
} else if *id == int64_id {
Ok(primitives.int64)
} else if *id == float_id {
Ok(primitives.float)
} else if *id == bool_id {
Ok(primitives.bool)
} else if *id == none_id {
Ok(primitives.none)
} else if *id == str_id {
Ok(primitives.str)
} else if *id == exn_id {
Ok(primitives.exception)
} else {
let obj_id = resolver.get_identifier_def(*id);
if let Some(obj_id) = obj_id {
let def = top_level_defs[obj_id.0].read();
if let TopLevelDef::Class { fields, methods, type_vars, .. } = &*def {
if !type_vars.is_empty() {
return Err(format!(
"Unexpected number of type parameters: expected {} but got 0",
type_vars.len()
));
}
let fields = RefCell::new(
chain(
fields.iter().map(|(k, v, m)| (*k, (*v, *m))),
methods.iter().map(|(k, v, _)| (*k, (*v, false))),
)
.collect(),
);
Ok(unifier.add_ty(TypeEnum::TObj {
obj_id,
fields,
params: Default::default(),
}))
} else {
Err("Cannot use function name as type".into())
}
} else {
// it could be a type variable
let ty = resolver.get_symbol_type(unifier, top_level_defs, primitives, *id)?;
if let TypeEnum::TVar { .. } = &*unifier.get_ty(ty) {
Ok(ty)
} else {
Err(format!("Unknown type annotation {}", id))
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}
}
}
};
let subscript_name_handle = |id: &StrRef, slice: &Expr<T>, unifier: &mut Unifier| {
if *id == virtual_id {
let ty = parse_type_annotation(resolver, top_level_defs, unifier, primitives, slice)?;
Ok(unifier.add_ty(TypeEnum::TVirtual { ty }))
} else if *id == list_id {
let ty = parse_type_annotation(resolver, top_level_defs, unifier, primitives, slice)?;
Ok(unifier.add_ty(TypeEnum::TList { ty }))
} else if *id == tuple_id {
if let Tuple { elts, .. } = &slice.node {
let ty = elts
.iter()
.map(|elt| {
parse_type_annotation(resolver, top_level_defs, unifier, primitives, elt)
})
.collect::<Result<Vec<_>, _>>()?;
Ok(unifier.add_ty(TypeEnum::TTuple { ty }))
} else {
Err("Expected multiple elements for tuple".into())
}
} else {
let types = if let Tuple { elts, .. } = &slice.node {
elts.iter()
.map(|v| {
parse_type_annotation(resolver, top_level_defs, unifier, primitives, v)
})
.collect::<Result<Vec<_>, _>>()?
} else {
vec![parse_type_annotation(resolver, top_level_defs, unifier, primitives, slice)?]
};
let obj_id = resolver
.get_identifier_def(*id)
.ok_or_else(|| format!("Unknown type annotation {}", id))?;
let def = top_level_defs[obj_id.0].read();
if let TopLevelDef::Class { fields, methods, type_vars, .. } = &*def {
if types.len() != type_vars.len() {
return Err(format!(
"Unexpected number of type parameters: expected {} but got {}",
type_vars.len(),
types.len()
));
}
let mut subst = HashMap::new();
for (var, ty) in izip!(type_vars.iter(), types.iter()) {
let id = if let TypeEnum::TVar { id, .. } = &*unifier.get_ty(*var) {
*id
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} else {
unreachable!()
};
subst.insert(id, *ty);
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}
let mut fields = fields
.iter()
.map(|(attr, ty, is_mutable)| {
let ty = unifier.subst(*ty, &subst).unwrap_or(*ty);
(*attr, (ty, *is_mutable))
})
.collect::<HashMap<_, _>>();
fields.extend(methods.iter().map(|(attr, ty, _)| {
let ty = unifier.subst(*ty, &subst).unwrap_or(*ty);
(*attr, (ty, false))
}));
Ok(unifier.add_ty(TypeEnum::TObj {
obj_id,
fields: fields.into(),
params: subst.into(),
}))
} else {
Err("Cannot use function name as type".into())
}
}
};
match &expr.node {
Name { id, .. } => name_handling(id, unifier),
Subscript { value, slice, .. } => {
if let Name { id, .. } = &value.node {
subscript_name_handle(id, slice, unifier)
} else {
Err(format!("unsupported type expression at {}", expr.location))
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}
}
_ => Err(format!("unsupported type expression at {}", expr.location)),
}
}
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impl dyn SymbolResolver + Send + Sync {
pub fn parse_type_annotation<T>(
&self,
top_level_defs: &[Arc<RwLock<TopLevelDef>>],
unifier: &mut Unifier,
primitives: &PrimitiveStore,
expr: &Expr<T>,
) -> Result<Type, String> {
parse_type_annotation(self, top_level_defs, unifier, primitives, expr)
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}
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}
impl Debug for dyn SymbolResolver + Send + Sync {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "")
}
}