resolve all the merge conflicts

Cargo.toml

@@ -35,7 +35,7 @@ members = [
   "input",
   "linter",
   "package",
-  "state"
+  "state",
 ]
 
 [dependencies.leo-ast]
@@ -123,7 +123,7 @@ version = "0.3"
 version = "0.7"
 
 [dependencies.rand_core]
-version = "0.6.1"
+version = "0.6.2"
 
 [dependencies.reqwest]
 version = "0.11.0"

asg/Cargo.toml

@@ -44,5 +44,8 @@ features = [ "v4", "serde" ]
 [dependencies.num-bigint]
 version = "0.3"
 
+[dependencies.typed-arena]
+version = "2.0"
+
 [dev-dependencies.criterion]
 version = "0.3"

asg/src/checks/return_path.rs

@@ -25,8 +25,6 @@ use crate::{
     Span,
 };
 
-use std::sync::Arc;
-
 pub struct ReturnPathReducer {
     pub errors: Vec<(Span, String)>,
 }
@@ -48,14 +46,14 @@ impl Default for ReturnPathReducer {
 }
 
 #[allow(unused_variables)]
-impl MonoidalReducerExpression<BoolAnd> for ReturnPathReducer {
-    fn reduce_expression(&mut self, input: &Arc<Expression>, value: BoolAnd) -> BoolAnd {
+impl<'a> MonoidalReducerExpression<'a, BoolAnd> for ReturnPathReducer {
+    fn reduce_expression(&mut self, input: &'a Expression<'a>, value: BoolAnd) -> BoolAnd {
         BoolAnd(false)
     }
 }
 
 #[allow(unused_variables)]
-impl MonoidalReducerStatement<BoolAnd> for ReturnPathReducer {
+impl<'a> MonoidalReducerStatement<'a, BoolAnd> for ReturnPathReducer {
     fn reduce_assign_access(&mut self, input: &AssignAccess, left: Option<BoolAnd>, right: Option<BoolAnd>) -> BoolAnd {
         BoolAnd(false)
     }
@@ -69,7 +67,7 @@ impl MonoidalReducerStatement<BoolAnd> for ReturnPathReducer {
             BoolAnd(false)
         } else if let Some(index) = statements[..statements.len() - 1].iter().map(|x| x.0).position(|x| x) {
             self.record_error(
-                input.statements[index].span(),
+                input.statements[index].get().span(),
                 "dead code due to unconditional early return".to_string(),
             );
             BoolAnd(true)

asg/src/const_value.rs

@@ -226,7 +226,7 @@ impl ConstInt {
         }
     }
 
-    pub fn get_type(&self) -> Type {
+    pub fn get_type<'a>(&self) -> Type<'a> {
         Type::Integer(self.get_int_type())
     }
 
@@ -247,7 +247,7 @@ impl ConstInt {
 }
 
 impl ConstValue {
-    pub fn get_type(&self) -> Option<Type> {
+    pub fn get_type<'a>(&self) -> Option<Type<'a>> {
         Some(match self {
             ConstValue::Int(i) => i.get_type(),
             ConstValue::Group(_) => Type::Group,

asg/src/expression/array_access.rs

@@ -17,56 +17,53 @@
 use crate::{AsgConvertError, ConstValue, Expression, ExpressionNode, FromAst, Node, PartialType, Scope, Span, Type};
 use leo_ast::IntegerType;
 
-use std::{
-    cell::RefCell,
-    sync::{Arc, Weak},
-};
-
-#[derive(Debug)]
-pub struct ArrayAccessExpression {
-    pub parent: RefCell<Option<Weak<Expression>>>,
+use std::cell::Cell;
+
+#[derive(Clone)]
+pub struct ArrayAccessExpression<'a> {
+    pub parent: Cell<Option<&'a Expression<'a>>>,
     pub span: Option<Span>,
-    pub array: Arc<Expression>,
-    pub index: Arc<Expression>,
+    pub array: Cell<&'a Expression<'a>>,
+    pub index: Cell<&'a Expression<'a>>,
 }
 
-impl Node for ArrayAccessExpression {
+impl<'a> Node for ArrayAccessExpression<'a> {
     fn span(&self) -> Option<&Span> {
         self.span.as_ref()
     }
 }
 
-impl ExpressionNode for ArrayAccessExpression {
-    fn set_parent(&self, parent: Weak<Expression>) {
+impl<'a> ExpressionNode<'a> for ArrayAccessExpression<'a> {
+    fn set_parent(&self, parent: &'a Expression<'a>) {
         self.parent.replace(Some(parent));
     }
 
-    fn get_parent(&self) -> Option<Arc<Expression>> {
-        self.parent.borrow().as_ref().map(Weak::upgrade).flatten()
+    fn get_parent(&self) -> Option<&'a Expression<'a>> {
+        self.parent.get()
     }
 
-    fn enforce_parents(&self, expr: &Arc<Expression>) {
-        self.array.set_parent(Arc::downgrade(expr));
-        self.index.set_parent(Arc::downgrade(expr));
+    fn enforce_parents(&self, expr: &'a Expression<'a>) {
+        self.array.get().set_parent(expr);
+        self.index.get().set_parent(expr);
     }
 
-    fn get_type(&self) -> Option<Type> {
-        match self.array.get_type() {
+    fn get_type(&self) -> Option<Type<'a>> {
+        match self.array.get().get_type() {
             Some(Type::Array(element, _)) => Some(*element),
             _ => None,
         }
     }
 
     fn is_mut_ref(&self) -> bool {
-        self.array.is_mut_ref()
+        self.array.get().is_mut_ref()
     }
 
     fn const_value(&self) -> Option<ConstValue> {
-        let mut array = match self.array.const_value()? {
+        let mut array = match self.array.get().const_value()? {
             ConstValue::Array(values) => values,
             _ => return None,
         };
-        let const_index = match self.index.const_value()? {
+        let const_index = match self.index.get().const_value()? {
             ConstValue::Int(x) => x.to_usize()?,
             _ => return None,
         };
@@ -77,17 +74,17 @@ impl ExpressionNode for ArrayAccessExpression {
     }
 
     fn is_consty(&self) -> bool {
-        self.array.is_consty()
+        self.array.get().is_consty()
     }
 }
 
-impl FromAst<leo_ast::ArrayAccessExpression> for ArrayAccessExpression {
+impl<'a> FromAst<'a, leo_ast::ArrayAccessExpression> for ArrayAccessExpression<'a> {
     fn from_ast(
-        scope: &Scope,
+        scope: &'a Scope<'a>,
         value: &leo_ast::ArrayAccessExpression,
-        expected_type: Option<PartialType>,
-    ) -> Result<ArrayAccessExpression, AsgConvertError> {
-        let array = Arc::<Expression>::from_ast(
+        expected_type: Option<PartialType<'a>>,
+    ) -> Result<ArrayAccessExpression<'a>, AsgConvertError> {
+        let array = <&Expression<'a>>::from_ast(
             scope,
             &*value.array,
             Some(PartialType::Array(expected_type.map(Box::new), None)),
@@ -103,7 +100,7 @@ impl FromAst<leo_ast::ArrayAccessExpression> for ArrayAccessExpression {
             }
         }
 
-        let index = Arc::<Expression>::from_ast(
+        let index = <&Expression<'a>>::from_ast(
             scope,
             &*value.index,
             Some(PartialType::Integer(None, Some(IntegerType::U32))),
@@ -116,19 +113,19 @@ impl FromAst<leo_ast::ArrayAccessExpression> for ArrayAccessExpression {
         }
 
         Ok(ArrayAccessExpression {
-            parent: RefCell::new(None),
+            parent: Cell::new(None),
             span: Some(value.span.clone()),
-            array,
-            index,
+            array: Cell::new(array),
+            index: Cell::new(index),
         })
     }
 }
 
-impl Into<leo_ast::ArrayAccessExpression> for &ArrayAccessExpression {
+impl<'a> Into<leo_ast::ArrayAccessExpression> for &ArrayAccessExpression<'a> {
     fn into(self) -> leo_ast::ArrayAccessExpression {
         leo_ast::ArrayAccessExpression {
-            array: Box::new(self.array.as_ref().into()),
-            index: Box::new(self.index.as_ref().into()),
+            array: Box::new(self.array.get().into()),
+            index: Box::new(self.index.get().into()),
             span: self.span.clone().unwrap_or_default(),
         }
     }

asg/src/expression/array_init.rs

@@ -16,40 +16,37 @@
 
 use crate::{AsgConvertError, ConstValue, Expression, ExpressionNode, FromAst, Node, PartialType, Scope, Span, Type};
 
-use std::{
-    cell::RefCell,
-    sync::{Arc, Weak},
-};
-
-#[derive(Debug)]
-pub struct ArrayInitExpression {
-    pub parent: RefCell<Option<Weak<Expression>>>,
+use std::cell::Cell;
+
+#[derive(Clone)]
+pub struct ArrayInitExpression<'a> {
+    pub parent: Cell<Option<&'a Expression<'a>>>,
     pub span: Option<Span>,
-    pub element: Arc<Expression>,
+    pub element: Cell<&'a Expression<'a>>,
     pub len: usize,
 }
 
-impl Node for ArrayInitExpression {
+impl<'a> Node for ArrayInitExpression<'a> {
     fn span(&self) -> Option<&Span> {
         self.span.as_ref()
     }
 }
 
-impl ExpressionNode for ArrayInitExpression {
-    fn set_parent(&self, parent: Weak<Expression>) {
+impl<'a> ExpressionNode<'a> for ArrayInitExpression<'a> {
+    fn set_parent(&self, parent: &'a Expression<'a>) {
         self.parent.replace(Some(parent));
     }
 
-    fn get_parent(&self) -> Option<Arc<Expression>> {
-        self.parent.borrow().as_ref().map(Weak::upgrade).flatten()
+    fn get_parent(&self) -> Option<&'a Expression<'a>> {
+        self.parent.get()
     }
 
-    fn enforce_parents(&self, expr: &Arc<Expression>) {
-        self.element.set_parent(Arc::downgrade(expr));
+    fn enforce_parents(&self, expr: &'a Expression<'a>) {
+        self.element.get().set_parent(expr);
     }
 
-    fn get_type(&self) -> Option<Type> {
-        Some(Type::Array(Box::new(self.element.get_type()?), self.len))
+    fn get_type(&self) -> Option<Type<'a>> {
+        Some(Type::Array(Box::new(self.element.get().get_type()?), self.len))
     }
 
     fn is_mut_ref(&self) -> bool {
@@ -62,16 +59,16 @@ impl ExpressionNode for ArrayInitExpression {
     }
 
     fn is_consty(&self) -> bool {
-        self.element.is_consty()
+        self.element.get().is_consty()
     }
 }
 
-impl FromAst<leo_ast::ArrayInitExpression> for ArrayInitExpression {
+impl<'a> FromAst<'a, leo_ast::ArrayInitExpression> for ArrayInitExpression<'a> {
     fn from_ast(
-        scope: &Scope,
+        scope: &'a Scope<'a>,
         value: &leo_ast::ArrayInitExpression,
-        expected_type: Option<PartialType>,
-    ) -> Result<ArrayInitExpression, AsgConvertError> {
+        expected_type: Option<PartialType<'a>>,
+    ) -> Result<ArrayInitExpression<'a>, AsgConvertError> {
         let (mut expected_item, expected_len) = match expected_type {
             Some(PartialType::Array(item, dims)) => (item.map(|x| *x), dims),
             None => (None, None),
@@ -130,28 +127,30 @@ impl FromAst<leo_ast::ArrayInitExpression> for ArrayInitExpression {
                 }
             }
         }
-        let mut element = Some(Arc::<Expression>::from_ast(scope, &*value.element, expected_item)?);
+        let mut element = Some(<&'a Expression<'a>>::from_ast(scope, &*value.element, expected_item)?);
         let mut output = None;
 
         for dimension in dimensions.iter().rev().copied() {
             output = Some(ArrayInitExpression {
-                parent: RefCell::new(None),
+                parent: Cell::new(None),
                 span: Some(value.span.clone()),
-                element: output
-                    .map(Expression::ArrayInit)
-                    .map(Arc::new)
-                    .unwrap_or_else(|| element.take().unwrap()),
+                element: Cell::new(
+                    output
+                        .map(Expression::ArrayInit)
+                        .map(|expr| &*scope.alloc_expression(expr))
+                        .unwrap_or_else(|| element.take().unwrap()),
+                ),
                 len: dimension,
             });
         }
         Ok(output.unwrap())
     }
 }
 
-impl Into<leo_ast::ArrayInitExpression> for &ArrayInitExpression {
+impl<'a> Into<leo_ast::ArrayInitExpression> for &ArrayInitExpression<'a> {
     fn into(self) -> leo_ast::ArrayInitExpression {
         leo_ast::ArrayInitExpression {
-            element: Box::new(self.element.as_ref().into()),
+            element: Box::new(self.element.get().into()),
             dimensions: leo_ast::ArrayDimensions(vec![leo_ast::PositiveNumber {
                 value: self.len.to_string(),
             }]),