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Clean up context garbage collection

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This commit is contained in:
Jeff 2024-09-02 03:58:53 -04:00
parent 14aa7c242a
commit 2a0e4c9b78
4 changed files with 16 additions and 26 deletions
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3
dust-lang/src/analyzer.rs
View File

@ -135,7 +135,6 @@ impl<'a> Analyzer<'a> {
StructType::Unit {
name: name.inner.clone(),
},
statement.position(),
)?;
}
StructDefinition::Tuple { name, items } => {
@ -147,7 +146,6 @@ impl<'a> Analyzer<'a> {
name: name.inner.clone(),
fields,
},
statement.position(),
)?;
}
StructDefinition::Fields { name, fields } => {
@ -164,7 +162,6 @@ impl<'a> Analyzer<'a> {
name: name.inner.clone(),
fields,
},
statement.position(),
)?;
}
};

25
dust-lang/src/context.rs
View File

@ -5,9 +5,9 @@ use std::{
sync::{Arc, PoisonError, RwLock, RwLockReadGuard, RwLockWriteGuard},
};
use crate::{ast::Span, Constructor, Identifier, StructType, Type, Value};
use crate::{Constructor, Identifier, StructType, Type, Value};
pub type Associations = HashMap<Identifier, (ContextData, Span)>;
pub type Associations = HashMap<Identifier, (ContextData, usize)>;
/// Garbage-collecting context for variables.
#[derive(Debug, Clone)]
@ -64,7 +64,7 @@ impl Context {
pub fn get(
&self,
identifier: &Identifier,
) -> Result<Option<(ContextData, Span)>, ContextError> {
) -> Result<Option<(ContextData, usize)>, ContextError> {
let associations = self.associations.read()?;
Ok(associations.get(identifier).cloned())
@ -223,20 +223,13 @@ impl Context {
&self,
identifier: Identifier,
struct_type: StructType,
position: Span,
) -> Result<(), ContextError> {
log::trace!("Setting {identifier} to constructor of type {struct_type}");
let mut variables = self.associations.write()?;
let last_position = variables
.get(&identifier)
.map(|(_, last_position)| {
if last_position.1 > position.1 {
*last_position
} else {
position
}
})
.map(|(_, last_position)| *last_position)
.unwrap_or_default();
variables.insert(
@ -248,13 +241,13 @@ impl Context {
}
/// Collects garbage up to the given position, removing all variables with lesser positions.
pub fn collect_garbage(&self, position_end: usize) -> Result<(), ContextError> {
log::trace!("Collecting garbage up to {position_end}");
pub fn collect_garbage(&self, position: usize) -> Result<(), ContextError> {
log::trace!("Collecting garbage up to {position}");
let mut variables = self.associations.write()?;
variables.retain(|identifier, (_, last_used)| {
let should_drop = position_end >= last_used.1;
let should_drop = position >= *last_used;
if should_drop {
log::trace!("Removing {identifier}");
@ -274,12 +267,12 @@ impl Context {
pub fn update_last_position(
&self,
identifier: &Identifier,
position: Span,
position: usize,
) -> Result<bool, ContextError> {
let mut associations = self.associations.write()?;
if let Some((_, last_position)) = associations.get_mut(identifier) {
if position.1 > last_position.1 {
if position > *last_position {
log::trace!("Updating {identifier}'s last position to {position:?}");
*last_position = position;

6
dust-lang/src/core_library.rs
View File

@ -13,7 +13,7 @@ pub fn core_library<'a>() -> &'a Context {
ContextData::VariableValue(Value::function(Function::BuiltIn(
BuiltInFunction::ToString,
))),
(0, 0),
0,
),
),
(
@ -22,7 +22,7 @@ pub fn core_library<'a>() -> &'a Context {
ContextData::VariableValue(Value::function(Function::BuiltIn(
BuiltInFunction::ReadLine,
))),
(0, 0),
0,
),
),
(
@ -31,7 +31,7 @@ pub fn core_library<'a>() -> &'a Context {
ContextData::VariableValue(Value::function(Function::BuiltIn(
BuiltInFunction::WriteLine,
))),
(0, 0),
0,
),
),
]))

8
dust-lang/src/parser.rs
View File

@ -455,7 +455,7 @@ impl<'src> Parser<'src> {
let identifier = Identifier::new(text);
if let ParserMode::Condition = self.mode {
context.update_last_position(&identifier, start_position)?;
context.update_last_position(&identifier, start_position.1)?;
return Ok(Expression::identifier(identifier, start_position));
}
@ -496,7 +496,7 @@ impl<'src> Parser<'src> {
let position = (start_position.0, self.current_position.1);
context.update_last_position(&identifier, position)?;
context.update_last_position(&identifier, position.1)?;
return Ok(Expression::r#struct(
StructExpression::Fields { name, fields },
@ -504,7 +504,7 @@ impl<'src> Parser<'src> {
));
}
context.update_last_position(&identifier, start_position)?;
context.update_last_position(&identifier, start_position.1)?;
Ok(Expression::identifier(identifier, start_position))
}
@ -988,7 +988,7 @@ impl<'src> Parser<'src> {
self.next_token()?;
context.update_last_position(&identifier, position)?;
context.update_last_position(&identifier, position.1)?;
Ok(Node::new(identifier, position))
} else {