CSY/reowolf Changeset - 9e689afc94cb · Centrum Wiskunde & Informatica (CWI)

Changeset - 9e689afc94cb

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MH - 3 years ago 2022-02-11 15:40:33
contact@maxhenger.nl

Initial rewrite implementation, pending integration and typesystem refactor

4 files changed with 161 insertions and 121 deletions:

src/protocol/ast.rs

src/protocol/parser/pass_definitions.rs

src/protocol/parser/pass_rewriting.rs

152

112

src/protocol/parser/pass_validation_linking.rs

0 comments (0 inline, 0 general)

src/protocol/ast.rs

➞

Show inline comments

@@ @@ -1154,97 +1154,96 @@ impl Statement { @@
             Statement::Fork(v) => v.span,
             Statement::Select(v) => v.span,
             Statement::Return(v) => v.span,
             Statement::Goto(v) => v.span,
             Statement::New(v) => v.span,
             Statement::Expression(v) => v.span,
             Statement::EndBlock(_)
             | Statement::EndIf(_)
             | Statement::EndWhile(_)
             | Statement::EndSynchronous(_)
             | Statement::EndFork(_)
             | Statement::EndSelect(_) => unreachable!(),
+        }
+    }
     pub fn link_next(&mut self, next: StatementId) {
         match self {
             Statement::Block(stmt) => stmt.next = next,
             Statement::EndBlock(stmt) => stmt.next = next,
             Statement::Local(stmt) => match stmt {
                 LocalStatement::Channel(stmt) => stmt.next = next,
                 LocalStatement::Memory(stmt) => stmt.next = next,
             },
             Statement::EndIf(stmt) => stmt.next = next,
             Statement::EndWhile(stmt) => stmt.next = next,
             Statement::EndSynchronous(stmt) => stmt.next = next,
             Statement::EndFork(stmt) => stmt.next = next,
             Statement::EndSelect(stmt) => stmt.next = next,
             Statement::New(stmt) => stmt.next = next,
             Statement::Expression(stmt) => stmt.next = next,
             Statement::Return(_)
             | Statement::Break(_)
             | Statement::Continue(_)
             | Statement::Synchronous(_)
             | Statement::Fork(_)
             | Statement::Select(_)
             | Statement::Goto(_)
             | Statement::While(_)
             | Statement::Labeled(_)
             | Statement::If(_) => unreachable!(),
+        }
+    }
+}
 #[derive(Debug, Clone)]
 pub struct BlockStatement {
     pub this: BlockStatementId,
     // Phase 1: parser
     pub is_implicit: bool,
     pub span: InputSpan, // of the complete block
     pub statements: Vec<StatementId>,
     pub end_block: EndBlockStatementId,
     // Phase 2: linker
     pub scope: ScopeId,
     pub next: StatementId,
+}
 #[derive(Debug, Clone)]
 pub struct EndBlockStatement {
     pub this: EndBlockStatementId,
     // Parser
     pub start_block: BlockStatementId,
     // Validation/Linking
     pub next: StatementId,
+}
 #[derive(Debug, Clone)]
 pub enum LocalStatement {
     Memory(MemoryStatement),
     Channel(ChannelStatement),
+}
 impl LocalStatement {
     pub fn this(&self) -> LocalStatementId {
         match self {
             LocalStatement::Memory(stmt) => stmt.this.upcast(),
             LocalStatement::Channel(stmt) => stmt.this.upcast(),
+        }
+    }
     pub fn as_memory(&self) -> &MemoryStatement {
         match self {
             LocalStatement::Memory(result) => result,
             _ => panic!("Unable to cast `LocalStatement` to `MemoryStatement`"),
+        }
+    }
     pub fn as_channel(&self) -> &ChannelStatement {
         match self {
             LocalStatement::Channel(result) => result,
             _ => panic!("Unable to cast `LocalStatement` to `ChannelStatement`"),
+        }
+    }
     pub fn span(&self) -> InputSpan {
         match self {
             LocalStatement::Channel(v) => v.span,
             LocalStatement::Memory(v) => v.span,
+        }
+    }
@@ @@ -1349,96 +1348,98 @@ pub struct ContinueStatement { @@
     // Phase 1: parser
     pub span: InputSpan, // of the "continue" keyword
     pub label: Option<Identifier>,
     // Phase 2: linker
     pub target: WhileStatementId, // invalid if not yet set
+}
 #[derive(Debug, Clone)]
 pub struct SynchronousStatement {
     pub this: SynchronousStatementId,
     // Phase 1: parser
     pub span: InputSpan, // of the "sync" keyword
     pub scope: ScopeId,
     pub body: StatementId,
     pub end_sync: EndSynchronousStatementId,
+}
 #[derive(Debug, Clone)]
 pub struct EndSynchronousStatement {
     pub this: EndSynchronousStatementId,
     pub start_sync: SynchronousStatementId,
     // Phase 2: linker
     pub next: StatementId,
+}
 #[derive(Debug, Clone)]
 pub struct ForkStatement {
     pub this: ForkStatementId,
     // Phase 1: parser
     pub span: InputSpan, // of the "fork" keyword
     pub left_body: StatementId,
     pub right_body: Option<StatementId>,
     pub end_fork: EndForkStatementId,
+}
 #[derive(Debug, Clone)]
 pub struct EndForkStatement {
     pub this: EndForkStatementId,
     pub start_fork: ForkStatementId,
     pub next: StatementId,
+}
 #[derive(Debug, Clone)]
 pub struct SelectStatement {
     pub this: SelectStatementId,
     pub span: InputSpan, // of the "select" keyword
     pub cases: Vec<SelectCase>,
     pub end_select: EndSelectStatementId,
     pub relative_pos_in_parent: i32,
     pub next: StatementId, // note: the select statement will be transformed into other AST elements, this `next` jumps to those replacement statements
+}
 #[derive(Debug, Clone)]
 pub struct SelectCase {
     // The guard statement of a `select` is either a MemoryStatement or an
     // ExpressionStatement. Nothing else is allowed by the initial parsing
     pub guard: StatementId,
     pub body: StatementId,
     pub scope: ScopeId,
     // Phase 2: Validation and Linking
     pub involved_ports: Vec<(CallExpressionId, ExpressionId)>, // call to `get` and its port argument
+}
 #[derive(Debug, Clone)]
 pub struct EndSelectStatement {
     pub this: EndSelectStatementId,
     pub start_select: SelectStatementId,
     pub next: StatementId,
+}
 #[derive(Debug, Clone)]
 pub struct ReturnStatement {
     pub this: ReturnStatementId,
     // Phase 1: parser
     pub span: InputSpan, // of the "return" keyword
     pub expressions: Vec<ExpressionId>,
+}
 #[derive(Debug, Clone)]
 pub struct GotoStatement {
     pub this: GotoStatementId,
     // Phase 1: parser
     pub span: InputSpan, // of the "goto" keyword
     pub label: Identifier,
     // Phase 2: linker
     pub target: LabeledStatementId, // invalid if not yet set
+}
 #[derive(Debug, Clone)]
 pub struct NewStatement {
     pub this: NewStatementId,
     // Phase 1: parser
     pub span: InputSpan, // of the "new" keyword
     pub expression: CallExpressionId,
     // Phase 2: linker
     pub next: StatementId,
+}

src/protocol/parser/pass_definitions.rs

➞

Show inline comments

@@ @@ -393,97 +393,96 @@ impl PassDefinitions { @@
                 // expression. This is a bit ugly.
                 if let Some(memory_stmt_id) = self.maybe_consume_memory_statement_without_semicolon(module, iter, ctx)? {
                     consume_token(&module.source, iter, TokenKind::SemiColon)?;
                     return Ok(memory_stmt_id.upcast().upcast());
                 } else {
                     let id = self.consume_expression_statement(module, iter, ctx)?;
                     return Ok(id.upcast());
+                }
+            }
         } else if next == TokenKind::OpenParen {
             // Same as above: memory statement or normal expression
             if let Some(memory_stmt_id) = self.maybe_consume_memory_statement_without_semicolon(module, iter, ctx)? {
                 consume_token(&module.source, iter, TokenKind::SemiColon)?;
                 return Ok(memory_stmt_id.upcast().upcast());
             } else {
                 let id = self.consume_expression_statement(module, iter, ctx)?;
                 return Ok(id.upcast());
+            }
         } else {
             let id = self.consume_expression_statement(module, iter, ctx)?;
             return Ok(id.upcast());
+        }
+    }
     fn consume_block_statement(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx
     ) -> Result<BlockStatementId, ParseError> {
         let open_curly_span = consume_token(&module.source, iter, TokenKind::OpenCurly)?;
         let mut stmt_section = self.statements.start_section();
         let mut next = iter.next();
         while next != Some(TokenKind::CloseCurly) {
             if next.is_none() {
                 return Err(ParseError::new_error_str_at_pos(
                     &module.source, iter.last_valid_pos(), "expected a statement or '}'"
                 ));
+            }
             let stmt_id = self.consume_statement(module, iter, ctx)?;
             stmt_section.push(stmt_id);
             next = iter.next();
+        }
         let statements = stmt_section.into_vec();
         let mut block_span = consume_token(&module.source, iter, TokenKind::CloseCurly)?;
         block_span.begin = open_curly_span.begin;
         let block_id = ctx.heap.alloc_block_statement(|this| BlockStatement{
             this,
             is_implicit: false,
             span: block_span,
             statements,
             end_block: EndBlockStatementId::new_invalid(),
             scope: ScopeId::new_invalid(),
             next: StatementId::new_invalid(),
         });
         let scope_id = ctx.heap.alloc_scope(|this| Scope::new(this, ScopeAssociation::Block(block_id)));
         let end_block_id = ctx.heap.alloc_end_block_statement(|this| EndBlockStatement{
             this, start_block: block_id, next: StatementId::new_invalid()
         });
         let block_stmt = &mut ctx.heap[block_id];
         block_stmt.end_block = end_block_id;
         block_stmt.scope = scope_id;
         Ok(block_id)
+    }
     fn consume_if_statement(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx
     ) -> Result<IfStatementId, ParseError> {
         let if_span = consume_exact_ident(&module.source, iter, KW_STMT_IF)?;
         consume_token(&module.source, iter, TokenKind::OpenParen)?;
         let test = self.consume_expression(module, iter, ctx)?;
         consume_token(&module.source, iter, TokenKind::CloseParen)?;
         // Consume bodies of if-statement
         let true_body = IfStatementCase{
             body: self.consume_statement(module, iter, ctx)?,
             scope: ScopeId::new_invalid(),
         };
         let false_body = if has_ident(&module.source, iter, KW_STMT_ELSE) {
             iter.consume();
             let false_body = IfStatementCase{
                 body: self.consume_statement(module, iter, ctx)?,
                 scope: ScopeId::new_invalid(),
             };
             let false_body_scope_id = false_body.scope;
             Some(false_body)
         } else {
             None
         };
         // Construct AST elements
         let if_stmt_id = ctx.heap.alloc_if_statement(|this| IfStatement{
@@ @@ -638,97 +637,100 @@ impl PassDefinitions { @@
     fn consume_select_statement(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx
     ) -> Result<SelectStatementId, ParseError> {
         let select_span = consume_exact_ident(&module.source, iter, KW_STMT_SELECT)?;
         consume_token(&module.source, iter, TokenKind::OpenCurly)?;
         let mut cases = Vec::new();
         let mut next = iter.next();
         while Some(TokenKind::CloseCurly) != next {
             let guard = match self.maybe_consume_memory_statement_without_semicolon(module, iter, ctx)? {
                 Some(guard_mem_stmt) => guard_mem_stmt.upcast().upcast(),
                 None => {
                     let start_pos = iter.last_valid_pos();
                     let expr = self.consume_expression(module, iter, ctx)?;
                     let end_pos = iter.last_valid_pos();
                     let guard_expr_stmt = ctx.heap.alloc_expression_statement(|this| ExpressionStatement{
                         this,
                         span: InputSpan::from_positions(start_pos, end_pos),
                         expression: expr,
                         next: StatementId::new_invalid(),
                     });
                     guard_expr_stmt.upcast()
                 },
             };
             consume_token(&module.source, iter, TokenKind::ArrowRight)?;
             let block = self.consume_statement(module, iter, ctx)?;
             cases.push(SelectCase{
                 guard,
                 body: block,
                 scope: ScopeId::new_invalid(),
                 involved_ports: Vec::with_capacity(1)
             });
             next = iter.next();
+        }
         consume_token(&module.source, iter, TokenKind::CloseCurly)?;
         let num_cases = cases.len();
         let select_stmt_id = ctx.heap.alloc_select_statement(|this| SelectStatement{
             this,
             span: select_span,
             cases,
             end_select: EndSelectStatementId::new_invalid(),
             relative_pos_in_parent: -1,
             next: StatementId::new_invalid(),
         });
         let end_select_stmt_id = ctx.heap.alloc_end_select_statement(|this| EndSelectStatement{
             this,
             start_select: select_stmt_id,
             next: StatementId::new_invalid(),
         });
         let select_stmt = &mut ctx.heap[select_stmt_id];
         select_stmt.end_select = end_select_stmt_id;
         for case_index in 0..num_cases {
             let scope_id = ctx.heap.alloc_scope(|this| Scope::new(this, ScopeAssociation::SelectCase(select_stmt_id, case_index as u32)));
             let select_stmt = &mut ctx.heap[select_stmt_id];
             let select_case = &mut select_stmt.cases[case_index];
             select_case.scope = scope_id;
+        }
         return Ok(select_stmt_id)
+    }
     fn consume_return_statement(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx
     ) -> Result<ReturnStatementId, ParseError> {
         let return_span = consume_exact_ident(&module.source, iter, KW_STMT_RETURN)?;
         let mut scoped_section = self.expressions.start_section();
         consume_comma_separated_until(
             TokenKind::SemiColon, &module.source, iter, ctx,
             |_source, iter, ctx| self.consume_expression(module, iter, ctx),
             &mut scoped_section, "an expression", None
         )?;
         let expressions = scoped_section.into_vec();
         if expressions.is_empty() {
             return Err(ParseError::new_error_str_at_span(&module.source, return_span, "expected at least one return value"));
         } else if expressions.len() > 1 {
             return Err(ParseError::new_error_str_at_span(&module.source, return_span, "multiple return values are not (yet) supported"))
+        }
         Ok(ctx.heap.alloc_return_statement(|this| ReturnStatement{
             this,
             span: return_span,
             expressions
         }))
+    }
     fn consume_goto_statement(
         &mut self, module: &Module, iter: &mut TokenIter, ctx: &mut PassCtx
     ) -> Result<GotoStatementId, ParseError> {

src/protocol/parser/pass_rewriting.rs

➞

Show inline comments

 use crate::collections::*;
 use crate::protocol::*;
 use super::visitor::*;
 pub(crate) struct PassRewriting {
-    current_scope: BlockStatementId,
+    current_scope: ScopeId,
     statement_buffer: ScopedBuffer<StatementId>,
     call_expr_buffer: ScopedBuffer<CallExpressionId>,
     expression_buffer: ScopedBuffer<ExpressionId>,
     scope_buffer: ScopedBuffer<ScopeId>,
+}
 impl PassRewriting {
     pub(crate) fn new() -> Self {
         Self{
             current_scope: BlockStatementId::new_invalid(),
             statement_buffer: ScopedBuffer::with_capacity(16),
             call_expr_buffer: ScopedBuffer::with_capacity(16),
             expression_buffer: ScopedBuffer::with_capacity(16),
             current_scope: ScopeId::new_invalid(),
             statement_buffer: ScopedBuffer::with_capacity(BUFFER_INIT_CAP_SMALL),
             call_expr_buffer: ScopedBuffer::with_capacity(BUFFER_INIT_CAP_SMALL),
             expression_buffer: ScopedBuffer::with_capacity(BUFFER_INIT_CAP_SMALL),
             scope_buffer: ScopedBuffer::with_capacity(BUFFER_INIT_CAP_SMALL),
+        }
+    }
+}
 impl Visitor for PassRewriting {
     // --- Visiting procedures
     fn visit_component_definition(&mut self, ctx: &mut Ctx, id: ComponentDefinitionId) -> VisitorResult {
         let def = &ctx.heap[id];
         let body_id = def.body;
         self.current_scope = def.scope;
         return self.visit_block_stmt(ctx, body_id);
+    }
     fn visit_function_definition(&mut self, ctx: &mut Ctx, id: FunctionDefinitionId) -> VisitorResult {
         let def = &ctx.heap[id];
         let body_id = def.body;
         self.current_scope = def.scope;
         return self.visit_block_stmt(ctx, body_id);
+    }
     // --- Visiting statements (that are not the select statement)
     fn visit_block_stmt(&mut self, ctx: &mut Ctx, id: BlockStatementId) -> VisitorResult {
         let block_stmt = &ctx.heap[id];
         let stmt_section = self.statement_buffer.start_section_initialized(&block_stmt.statements);
-        self.current_scope = id;
+        self.current_scope = block_stmt.scope;
         for stmt_idx in 0..stmt_section.len() {
             self.visit_stmt(ctx, stmt_section[stmt_idx])?;
+        }
         stmt_section.forget();
         return Ok(())
+    }
     fn visit_labeled_stmt(&mut self, ctx: &mut Ctx, id: LabeledStatementId) -> VisitorResult {
         let labeled_stmt = &ctx.heap[id];
         let body_id = labeled_stmt.body;
         return self.visit_stmt(ctx, body_id);
+    }
     fn visit_if_stmt(&mut self, ctx: &mut Ctx, id: IfStatementId) -> VisitorResult {
         let if_stmt = &ctx.heap[id];
         let true_body_id = if_stmt.true_case;
         let false_body_id = if_stmt.false_case;
         let true_case = if_stmt.true_case;
         let false_case = if_stmt.false_case;
         self.visit_stmt(ctx, true_body_id.body)?;
         if let Some(false_body_id) = false_body_id {
             self.visit_stmt(ctx, false_body_id.body)?;
         self.current_scope = true_case.scope;
         self.visit_stmt(ctx, true_case.body)?;
         if let Some(false_case) = false_case {
             self.current_scope = false_case.scope;
             self.visit_stmt(ctx, false_case.body)?;
+        }
         return Ok(())
+    }
     fn visit_while_stmt(&mut self, ctx: &mut Ctx, id: WhileStatementId) -> VisitorResult {
         let while_stmt = &ctx.heap[id];
         let body_id = while_stmt.body;
         self.current_scope = while_stmt.scope;
         return self.visit_stmt(ctx, body_id);
+    }
     fn visit_synchronous_stmt(&mut self, ctx: &mut Ctx, id: SynchronousStatementId) -> VisitorResult {
         let sync_stmt = &ctx.heap[id];
         let body_id = sync_stmt.body;
         self.current_scope = sync_stmt.scope;
         return self.visit_stmt(ctx, body_id);
+    }
     // --- Visiting the select statement
     fn visit_select_stmt(&mut self, ctx: &mut Ctx, id: SelectStatementId) -> VisitorResult {
         // Utility for the last stage of rewriting process. Note that caller
         // still needs to point the end of the if-statement to the end of the
         // replacement statement of the select statement.
         fn transform_select_case_code(ctx: &mut Ctx, select_id: SelectStatementId, case_index: usize, select_var_id: VariableId) -> (IfStatementId, EndIfStatementId) {
             // Retrieve statement IDs associated with case
             let case = &ctx.heap[select_id].cases[case_index];
             let case_guard_id = case.guard;
             let case_body_id = case.body;
             let case_scope_id = case.scope;
             // Create the if-statement for the result of the select statement
             let compare_expr_id = create_ast_equality_comparison_expr(ctx, select_var_id, case_index as u64);
             let true_case = IfStatementCase{
                 body: case_guard_id, // which is linked up to the body
                 scope: case_scope_id,
             };
             let (if_stmt_id, end_if_stmt_id) = create_ast_if_stmt(ctx, compare_expr_id.upcast(), true_case, None);
             // Link up body statement to end-if
             set_ast_statement_next(ctx, case_body_id, end_if_stmt_id.upcast());
             return (if_stmt_id, end_if_stmt_id)
+        }
         // We're going to transform the select statement by a block statement
         // containing builtin runtime-calls. And to do so we create temporary
         // variables and move some other statements around.
         // Precreate the block that will end up containing all of the
         // transformed statements. Also precreate the scope associated with it
         let (outer_block_id, outer_end_block_id, outer_scope_id) =
             create_ast_block_stmt(ctx, Vec::new());
         // The "select" and the "end select" statement will act like trampolines
         // that jump to the replacement block. So set the child/parent
         // relationship already.
         // --- for the statements
         let select_stmt = &mut ctx.heap[id];
         select_stmt.next = outer_block_id.upcast();
         let end_select_stmt_id = select_stmt.end_select;
         let select_stmt_relative_pos = select_stmt.relative_pos_in_parent;
         let outer_end_block_stmt = &mut ctx.heap[outer_end_block_id];
         outer_end_block_stmt.next = end_select_stmt_id.upcast();
         // --- for the scopes
         link_existing_child_to_new_parent_scope(ctx, &mut self.scope_buffer, self.current_scope, outer_scope_id, select_stmt_relative_pos);
         // Create statements that will create temporary variables for all of the
         // ports passed to the "get" calls in the select case guards.
         let select_stmt = &ctx.heap[id];
         let total_num_cases = select_stmt.cases.len();
         let mut total_num_ports = 0;
         let end_select_stmt_id = select_stmt.end_select;
         let end_select = &ctx.heap[end_select_stmt_id];
         let stmt_id_after_select_stmt = end_select.next;
         // Put heap IDs into temporary buffers to handle borrowing rules
         let mut call_id_section = self.call_expr_buffer.start_section();
         let mut expr_id_section = self.expression_buffer.start_section();
         for case in select_stmt.cases.iter() {
             total_num_ports += case.involved_ports.len();
             for (call_id, expr_id) in case.involved_ports.iter().copied() {
                 call_id_section.push(call_id);
                 expr_id_section.push(expr_id);
+            }
+        }
         // Transform all of the call expressions by takings its argument (the
         // port from which we `get`) and turning it into a temporary variable.
         let mut transformed_stmts = Vec::with_capacity(total_num_ports); // TODO: Recompute this preallocated length, put assert at the end
         let mut locals = Vec::with_capacity(total_num_ports);
         for port_var_idx in 0..call_id_section.len() {
             let get_call_expr_id = call_id_section[port_var_idx];
             let port_expr_id = expr_id_section[port_var_idx];
             // Move the port expression such that it gets assigned to a temporary variable
             let variable_id = create_ast_variable(ctx);
+            let variable_id = create_ast_variable(ctx, outer_scope_id);
             let variable_decl_stmt_id = create_ast_variable_declaration_stmt(ctx, variable_id, port_expr_id);
             // Replace the original port expression in the call with a reference
             // to the replacement variable
             let variable_expr_id = create_ast_variable_expr(ctx, variable_id);
             let call_expr = &mut ctx.heap[get_call_expr_id];
             call_expr.arguments[0] = variable_expr_id.upcast();
             transformed_stmts.push(variable_decl_stmt_id.upcast().upcast());
             locals.push(variable_id);
+        }
         // Insert runtime calls that facilitate the semantics of the select
         // block.
         // Create the call that indicates the start of the select block
+        {
             let num_cases_expression_id = create_ast_literal_integer_expr(ctx, total_num_cases as u64);
             let num_ports_expression_id = create_ast_literal_integer_expr(ctx, total_num_ports as u64);
             let arguments = vec![
                 num_cases_expression_id.upcast(),
                 num_ports_expression_id.upcast()
             ];
             let call_expression_id = create_ast_call_expr(ctx, Method::SelectStart, &mut self.expression_buffer, arguments);
             let call_statement_id = create_ast_expression_stmt(ctx, call_expression_id.upcast());
             transformed_stmts.push(call_statement_id.upcast());
+        }
         // Create calls for each select case that will register the ports that
         // we are waiting on at the runtime.
+        {
             let mut total_port_index = 0;
             for case_index in 0..total_num_cases {
                 let case = &ctx.heap[id].cases[case_index];
                 let case_num_ports = case.involved_ports.len();
                 for case_port_index in 0..case_num_ports {
                     // Arguments to runtime call
                     let port_variable_id = locals[total_port_index]; // so far this variable contains the temporary variables for the port expressions
                     let case_index_expr_id = create_ast_literal_integer_expr(ctx, case_index as u64);
                     let port_index_expr_id = create_ast_literal_integer_expr(ctx, case_port_index as u64);
                     let port_variable_expr_id = create_ast_variable_expr(ctx, port_variable_id);
                     let runtime_call_arguments = vec![
                         case_index_expr_id.upcast(),
                         port_index_expr_id.upcast(),
                         port_variable_expr_id.upcast()
                     ];
                     // Create runtime call, then store it
                     let runtime_call_expr_id = create_ast_call_expr(ctx, Method::SelectRegisterCasePort, &mut self.expression_buffer, runtime_call_arguments);
                     let runtime_call_stmt_id = create_ast_expression_stmt(ctx, runtime_call_expr_id.upcast());
                     transformed_stmts.push(runtime_call_stmt_id.upcast());
                     total_port_index += 1;
+                }
+            }
+        }
         // Create the variable that will hold the result of a completed select
         // block. Then create the runtime call that will produce this result
         let select_variable_id = create_ast_variable(ctx);
+        let select_variable_id = create_ast_variable(ctx, outer_scope_id);
         locals.push(select_variable_id);
+        {
             let runtime_call_expr_id = create_ast_call_expr(ctx, Method::SelectWait, &mut self.expression_buffer, Vec::new());
             let variable_stmt_id = create_ast_variable_declaration_stmt(ctx, select_variable_id, runtime_call_expr_id.upcast());
             transformed_stmts.push(variable_stmt_id.upcast().upcast());
+        }
         call_id_section.forget();
         expr_id_section.forget();
         // Precreate the block statement that will be the replacement of the
         // select statement. Do not set its members yet.
         let replacement_stmt_id = ctx.heap.alloc_block_statement(|this| BlockStatement{
             this,
             is_implicit: true,
             span: InputSpan::new(),
             statements: Vec::new(),
             end_block: EndBlockStatementId::new_invalid(),
             scope: ScopeId::new_invalid(),
             next: StatementId::new_invalid(),
         });
         let end_block_id = ctx.heap.alloc_end_block_statement(|this| EndBlockStatement{
             this,
             start_block: replacement_stmt_id,
             next: stmt_id_after_select_stmt,
         });
         // Now we transform each of the select block case's guard and code into
         // a chained if-else statement.
         if total_num_cases > 0 {
             let (if_stmt_id, end_if_stmt_id) = transform_select_case_code(ctx, id, 0, select_variable_id);
             let first_end_if_stmt = &mut ctx.heap[end_if_stmt_id];
             first_end_if_stmt.next = outer_end_block_id.upcast();
             let mut last_if_stmt_id = if_stmt_id;
             let mut last_end_if_stmt_id = end_if_stmt_id;
             transformed_stmts.push(last_if_stmt_id.upcast());
             for case_index in 1..total_num_cases {
                 let (if_stmt_id, end_if_stmt_id) = transform_select_case_code(ctx, id, case_index, select_variable_id);
                 let last_if_stmt = &mut ctx.heap[last_if_stmt_id];
                 // last_if_stmt.false_case = Some(if_stmt_id.upcast());
                 // TODO:
                 //  1. Change scoping such that it is a separate datastructure with separate IDs
                 //  2. Change statements that contain "implicit scopes" to explicitly point to the appropriate scopes
                 //  3. Continue here setting the true-body and false-body.
                 //  4. Figure out how we're going to link everything up again
+            }
+        }
         // let block = ctx.heap.alloc_block_statement(|this| BlockStatement{
         //     this,
         //     is_implicit: true,
         //     span: stmt.span,
         //     statements: vec![],
         //     end_block: EndBlockStatementId(),
         //     scope_node: ScopeNode {},
         //     first_unique_id_in_scope: 0,
         //     next_unique_id_in_scope: 0,
         //     locals,
         //     labels: vec![],
         //     next: ()
         // });
                 let false_case_scope_id = ctx.heap.alloc_scope(|this| Scope::new(this, ScopeAssociation::If(last_if_stmt_id, false)));
                 set_ast_if_statement_false_body(ctx, last_if_stmt_id, last_end_if_stmt_id, IfStatementCase{ body: if_stmt_id.upcast(), scope: false_case_scope_id });
                 let end_if_stmt = &mut ctx.heap[end_if_stmt_id];
                 end_if_stmt.next = last_end_if_stmt_id.upcast();
                 last_if_stmt_id = if_stmt_id;
                 last_end_if_stmt_id = end_if_stmt_id;
+            }
+        }
         // Final steps: set the statements of the replacement block statement,
         // and link all of those statements together
         let mut last_stmt_id = transformed_stmts[0];
         for stmt_id in transformed_stmts.iter().skip(1).copied() {
             set_ast_statement_next(ctx, last_stmt_id, stmt_id);
             last_stmt_id = stmt_id;
+        }
         let outer_block_stmt = &mut ctx.heap[outer_block_id];
         outer_block_stmt.statements = transformed_stmts;
         return Ok(())
+    }
+}
 impl PassRewriting {
     fn create_runtime_call_statement(&self, ctx: &mut Ctx, method: Method, arguments: Vec<ExpressionId>) -> (CallExpressionId, ExpressionStatementId) {
         let call_expr_id = ctx.heap.alloc_call_expression(|this| CallExpression{
             this,
             func_span: InputSpan::new(),
             full_span: InputSpan::new(),
             parser_type: ParserType{
                 elements: Vec::new(),
                 full_span: InputSpan::new(),
             },
             method,
             arguments,
             definition: DefinitionId::new_invalid(),
             parent: ExpressionParent::None,
             unique_id_in_definition: -1,
         });
         let call_stmt_id = ctx.heap.alloc_expression_statement(|this| ExpressionStatement{
             this,
             span: InputSpan::new(),
             expression: call_expr_id.upcast(),
             next: StatementId::new_invalid(),
         });
         let call_expr = &mut ctx.heap[call_expr_id];
         call_expr.parent = ExpressionParent::ExpressionStmt(call_stmt_id);
         return (call_expr_id, call_stmt_id);
+    }
     fn create_runtime_select_wait_variable_and_statement(&self, ctx: &mut Ctx) -> (VariableId, MemoryStatementId) {
         let variable_id = create_ast_variable(ctx);
         let variable_expr_id = create_ast_variable_expr(ctx, variable_id);
         let runtime_call_expr_id = ctx.heap.alloc_call_expression(|this| CallExpression{
             this,
             func_span: InputSpan::new(),
             full_span: InputSpan::new(),
             parser_type: ParserType{
                 elements: Vec::new(),
                 full_span: InputSpan::new(),
             },
             method: Method::SelectWait,
             arguments: Vec::new(),
             definition: DefinitionId::new_invalid(),
             parent: ExpressionParent::None,
             unique_id_in_definition: -1
         });
         let initial_expr_id = ctx.heap.alloc_assignment_expression(|this| AssignmentExpression{
             this,
             operator_span: InputSpan::new(),
             full_span: InputSpan::new(),
             left: variable_expr_id.upcast(),
             operation: AssignmentOperator::Set,
             right: runtime_call_expr_id.upcast(),
             parent: ExpressionParent::None,
             unique_id_in_definition: -1
         });
         let variable_statement_id = ctx.heap.alloc_memory_statement(|this| MemoryStatement{
             this,
             span: InputSpan::new(),
             variable: variable_id,
             initial_expr: initial_expr_id,
             next: StatementId::new_invalid()
         });
         let variable_expr = &mut ctx.heap[variable_expr_id];
         variable_expr.parent = ExpressionParent::Expression(initial_expr_id.upcast(), 0);
         let runtime_call_expr = &mut ctx.heap[runtime_call_expr_id];
         runtime_call_expr.parent = ExpressionParent::Expression(initial_expr_id.upcast(), 1);
         let initial_expr = &mut ctx.heap[initial_expr_id];
         initial_expr.parent = ExpressionParent::Memory(variable_statement_id);
         return (variable_id, variable_statement_id);
+    }
+}
 // -----------------------------------------------------------------------------
 // Utilities to create compiler-generated AST nodes
 // -----------------------------------------------------------------------------
 fn create_ast_variable(ctx: &mut Ctx) -> VariableId {
     return ctx.heap.alloc_variable(|this| Variable{
 fn create_ast_variable(ctx: &mut Ctx, scope_id: ScopeId) -> VariableId {
     let variable_id = ctx.heap.alloc_variable(|this| Variable{
         this,
         kind: VariableKind::Local,
         parser_type: ParserType{
             elements: Vec::new(),
             full_span: InputSpan::new(),
         },
         identifier: Identifier::new_empty(InputSpan::new()),
         relative_pos_in_parent: -1,
         unique_id_in_scope: -1,
     });
     let scope = &mut ctx.heap[scope_id];
     scope.variables.push(variable_id);
     return variable_id;
+}
 fn create_ast_variable_expr(ctx: &mut Ctx, variable_id: VariableId) -> VariableExpressionId {
     return ctx.heap.alloc_variable_expression(|this| VariableExpression{
         this,
         identifier: Identifier::new_empty(InputSpan::new()),
         declaration: Some(variable_id),
         used_as_binding_target: false,
         parent: ExpressionParent::None,
         unique_id_in_definition: -1
     });
+}
 fn create_ast_call_expr(ctx: &mut Ctx, method: Method, buffer: &mut ScopedBuffer<ExpressionId>, arguments: Vec<ExpressionId>) -> CallExpressionId {
     let expression_ids = buffer.start_section_initialized(&arguments);
     let call_expression_id = ctx.heap.alloc_call_expression(|this| CallExpression{
         this,
         func_span: InputSpan::new(),
         full_span: InputSpan::new(),
         parser_type: ParserType{
             elements: Vec::new(),
             full_span: InputSpan::new(),
         },
         method,
         arguments,
         definition: DefinitionId::new_invalid(),
         parent: ExpressionParent::None,
         unique_id_in_definition: -1,
     });
     for argument_index in 0..expression_ids.len() {
         let argument_id = expression_ids[argument_index];
         let argument_expr = &mut ctx.heap[argument_id];
         *argument_expr.parent_mut() = ExpressionParent::Expression(call_expression_id.upcast(), argument_index as u32);
+    }
     return call_expression_id;
+}
 fn create_ast_literal_integer_expr(ctx: &mut Ctx, unsigned_value: u64) -> LiteralExpressionId {
     return ctx.heap.alloc_literal_expression(|this| LiteralExpression{
         this,
         span: InputSpan::new(),
         value: Literal::Integer(LiteralInteger{
             unsigned_value,
             negated: false,
         }),
         parent: ExpressionParent::None,
 fn create_ast_expression_stmt(ctx: &mut Ctx, expression_id: ExpressionId) -> ExpressionStatementId {
     let statement_id = ctx.heap.alloc_expression_statement(|this| ExpressionStatement{
         this,
         span: InputSpan::new(),
         expression: expression_id,
         next: StatementId::new_invalid(),
     });
     let expression = &mut ctx.heap[expression_id];
     *expression.parent_mut() = ExpressionParent::ExpressionStmt(statement_id);
     return statement_id;
+}
 fn create_ast_variable_declaration_stmt(ctx: &mut Ctx, variable_id: VariableId, initial_value_expr_id: ExpressionId) -> MemoryStatementId {
     // Create the assignment expression, assigning the initial value to the variable
     let variable_expr_id = create_ast_variable_expr(ctx, variable_id);
     let assignment_expr_id = ctx.heap.alloc_assignment_expression(|this| AssignmentExpression{
         this,
         operator_span: InputSpan::new(),
         full_span: InputSpan::new(),
         left: variable_expr_id.upcast(),
         operation: AssignmentOperator::Set,
         right: initial_value_expr_id,
         parent: ExpressionParent::None,
         unique_id_in_definition: -1,
     });
     // Create the memory statement
     let memory_stmt_id = ctx.heap.alloc_memory_statement(|this| MemoryStatement{
         this,
         span: InputSpan::new(),
         variable: variable_id,
         initial_expr: assignment_expr_id,
         next: StatementId::new_invalid(),
     });
     // Set all parents which we can access
     let variable_expr = &mut ctx.heap[variable_expr_id];
     variable_expr.parent = ExpressionParent::Expression(assignment_expr_id.upcast(), 0);
     let value_expr = &mut ctx.heap[initial_value_expr_id];
     *value_expr.parent_mut() = ExpressionParent::Expression(assignment_expr_id.upcast(), 1);
     let assignment_expr = &mut ctx.heap[assignment_expr_id];
     assignment_expr.parent = ExpressionParent::Memory(memory_stmt_id);
     return memory_stmt_id;
+}
 fn create_ast_block_stmt(ctx: &mut Ctx, statements: Vec<StatementId>) -> (BlockStatementId, EndBlockStatementId, ScopeId) {
     let block_stmt_id = ctx.heap.alloc_block_statement(|this| BlockStatement{
         this,
         span: InputSpan::new(),
         statements,
         end_block: EndBlockStatementId::new_invalid(),
         scope: ScopeId::new_invalid(),
         next: StatementId::new_invalid(),
     });
     let end_block_stmt_id = ctx.heap.alloc_end_block_statement(|this| EndBlockStatement{
         this,
         start_block: block_stmt_id,
         next: StatementId::new_invalid(),
     });
     let scope_id = ctx.heap.alloc_scope(|this| Scope::new(this, ScopeAssociation::Block(block_stmt_id)));
     let block_stmt = &mut ctx.heap[block_stmt_id];
     block_stmt.end_block = end_block_stmt_id;
     block_stmt.scope = scope_id;
     return (block_stmt_id, end_block_stmt_id, scope_id);
+}
 fn create_ast_if_stmt(ctx: &mut Ctx, condition_expression_id: ExpressionId, true_case: IfStatementCase, false_case: Option<IfStatementCase>) -> (IfStatementId, EndIfStatementId) {
     // Create if statement and the end-if statement
     let if_stmt_id = ctx.heap.alloc_if_statement(|this| IfStatement{
         this,
         span: InputSpan::new(),
         test: condition_expression_id,
         true_case,
         false_case,
         end_if: EndIfStatementId::new_invalid()
     });
     let end_if_stmt_id = ctx.heap.alloc_end_if_statement(|this| EndIfStatement{
         this,
         start_if: if_stmt_id,
         next: StatementId::new_invalid(),
     });
     // Link the statements up as much as we can
     let if_stmt = &mut ctx.heap[if_stmt_id];
     if_stmt.end_if = end_if_stmt_id;
     let condition_expr = &mut ctx.heap[condition_expression_id];
     *condition_expr.parent_mut() = ExpressionParent::If(if_stmt_id);
     return (if_stmt_id, end_if_stmt_id);
+}
 fn set_ast_if_statement_false_body(ctx: &mut Ctx, if_statement_id: IfStatementId, end_if_statement_id: EndIfStatementId, false_body_id: StatementId) {
 /// Sets the false body for a given
 fn set_ast_if_statement_false_body(ctx: &mut Ctx, if_statement_id: IfStatementId, end_if_statement_id: EndIfStatementId, false_case: IfStatementCase) {
     // Point if-statement to "false body"
     todo!("set scopes");
     let if_stmt = &mut ctx.heap[if_statement_id];
     debug_assert!(if_stmt.false_case.is_none()); // simplifies logic, not necessary
     if_stmt.false_case = Some(IfStatementCase{
         body: false_body_id,
         scope: ScopeId::new_invalid(),
     });
     if_stmt.false_case = Some(false_case);
     // Point end of false body to the end of the if statement
-    set_ast_statement_next(ctx, false_body_id, end_if_statement_id.upcast());
+    set_ast_statement_next(ctx, false_case.body, end_if_statement_id.upcast());
+}
 /// Sets the specified AST statement's control flow such that it will be
 /// followed by the target statement. This may seem obvious, but may imply that
 /// a statement associated with, but different from, the source statement is
 /// modified.
 fn set_ast_statement_next(ctx: &mut Ctx, source_stmt_id: StatementId, target_stmt_id: StatementId) {
     let source_stmt = &mut ctx.heap[source_stmt_id];
     match source_stmt {
         Statement::Block(stmt) => {
             let end_id = stmt.end_block;
             ctx.heap[end_id].next = target_stmt_id
         },
         Statement::EndBlock(stmt) => stmt.next = target_stmt_id,
         Statement::Local(stmt) => {
             match stmt {
                 LocalStatement::Memory(stmt) => stmt.next = target_stmt_id,
                 LocalStatement::Channel(stmt) => stmt.next = target_stmt_id,
+            }
         },
         Statement::Labeled(stmt) => {
             let body_id = stmt.body;
             set_ast_statement_next(ctx, body_id, target_stmt_id);
         },
         Statement::If(stmt) => {
             let end_id = stmt.end_if;
             ctx.heap[end_id].next = target_stmt_id;
         },
         Statement::EndIf(stmt) => stmt.next = target_stmt_id,
         Statement::While(stmt) => {
             let end_id = stmt.end_while;
             ctx.heap[end_id].next = target_stmt_id;
         },
         Statement::EndWhile(stmt) => stmt.next = target_stmt_id,
         Statement::Break(_stmt) => {},
         Statement::Continue(_stmt) => {},
         Statement::Synchronous(stmt) => {
             let end_id = stmt.end_sync;
             ctx.heap[end_id].next = target_stmt_id;
         },
         Statement::EndSynchronous(stmt) => {
             stmt.next = target_stmt_id;
         },
         Statement::Fork(_) | Statement::EndFork(_) => {
             todo!("remove fork from language");
         },
         Statement::Select(stmt) => {
             let end_id = stmt.end_select;
             ctx.heap[end_id].next = target_stmt_id;
         },
         Statement::EndSelect(stmt) => stmt.next = target_stmt_id,
         Statement::Return(_stmt) => {},
         Statement::Goto(_stmt) => {},
         Statement::New(stmt) => stmt.next = target_stmt_id,
         Statement::Expression(stmt) => stmt.next = target_stmt_id,
+    }
+}
 /// Links a new scope to an existing scope as its child.
 fn link_new_child_to_existing_parent_scope(ctx: &mut Ctx, scope_buffer: &mut ScopedBuffer<ScopeId>, parent_scope_id: ScopeId, child_scope_id: ScopeId, relative_pos_hint: i32) {
     let child_scope = &mut ctx.heap[child_scope_id];
     debug_assert!(child_scope.parent.is_none());
     child_scope.parent = Some(parent_scope_id);
     child_scope.relative_pos_in_parent = relative_pos_hint;
     add_child_scope_to_parent(ctx, scope_buffer, parent_scope_id, child_scope_id, relative_pos_hint);
+}
 /// Relinks an existing scope to a new scope as its child. Will also break the
 /// link of the child scope's old parent.
 fn link_existing_child_to_new_parent_scope(ctx: &mut Ctx, scope_buffer: &mut ScopedBuffer<ScopeId>, new_parent_scope_id: ScopeId, child_scope_id: ScopeId, new_relative_pos_in_parent: i32) {
     let child_scope = &mut ctx.heap[child_scope_id];
     let old_parent_scope_id = child_scope.parent.unwrap();
     child_scope.parent = Some(new_parent_scope_id);
     child_scope.relative_pos_in_parent = new_relative_pos_in_parent;
     // Remove from old parent
     let old_parent = &mut ctx.heap[old_parent_scope_id];
     let scope_index = old_parent.nested.iter()
         .position(|v| *v == child_scope_id)
         .unwrap();
     old_parent.nested.remove(scope_index);
     // Add to new parent
     add_child_scope_to_parent(ctx, scope_buffer, new_parent_scope_id, child_scope_id, new_relative_pos_in_parent);
+}
 /// Will add a child scope to a parent scope using the relative position hint.
 fn add_child_scope_to_parent(ctx: &mut Ctx, scope_buffer: &mut ScopedBuffer<ScopeId>, parent_scope_id: ScopeId, child_scope_id: ScopeId, relative_pos_hint: i32) {
     let child_scope = &ctx.heap[child_scope_id];
     let existing_scope_ids = scope_buffer.start_section_initialized(&child_scope.nested);
     let mut insert_pos = existing_scope_ids.len();
     for index in 0..existing_scope_ids.len() {
         let existing_scope_id = existing_scope_ids[index];
         let existing_scope = &ctx.heap[existing_scope_id];
         if relative_pos_hint <= existing_scope.relative_pos_in_parent {
             insert_pos = index;
             break;
+        }
+    }
     existing_scope_ids.forget();
     let parent_scope = &mut ctx.heap[parent_scope_id];
     parent_scope.nested.insert(insert_pos, child_scope_id);
+}

src/protocol/parser/pass_validation_linking.rs

➞

Show inline comments

@@ @@ -270,99 +270,96 @@ impl Visitor for PassValidationLinking { @@
         // Visit statements in function body
         self.visit_block_stmt(ctx, body_id)?;
         self.pop_scope(old_scope);
         // Assign total number of expressions and assign an in-block unique ID
         // to each of the locals in the procedure.
         let definition = &mut ctx.heap[id];
         let definition_scope = definition.scope;
         definition.num_expressions_in_body = self.next_expr_index;
         self.visit_scope_and_assign_local_ids(ctx, definition_scope, 0);
         self.resolve_pending_control_flow_targets(ctx)?;
         Ok(())
+    }
     //--------------------------------------------------------------------------
     // Statement visitors
     //--------------------------------------------------------------------------
     fn visit_block_stmt(&mut self, ctx: &mut Ctx, id: BlockStatementId) -> VisitorResult {
         // Get end of block
         let block_stmt = &ctx.heap[id];
         let end_block_id = block_stmt.end_block;
         let scope_id = block_stmt.scope;
         // Traverse statements in block
         let statement_section = self.statement_buffer.start_section_initialized(&block_stmt.statements);
         let old_scope = self.push_scope(ctx, false, scope_id);
         assign_and_replace_next_stmt!(self, ctx, id.upcast());
         for stmt_idx in 0..statement_section.len() {
             self.relative_pos_in_parent = stmt_idx as i32;
             self.visit_stmt(ctx, statement_section[stmt_idx])?;
+        }
         statement_section.forget();
         assign_and_replace_next_stmt!(self, ctx, end_block_id.upcast());
         self.pop_scope(old_scope);
         Ok(())
+    }
     fn visit_local_memory_stmt(&mut self, ctx: &mut Ctx, id: MemoryStatementId) -> VisitorResult {
         let stmt = &ctx.heap[id];
         let expr_id = stmt.initial_expr;
         let variable_id = stmt.variable;
         if ctx.heap[variable_id].identifier.value.as_str() == "counter" {
             let a = 1;
+        }
         self.checked_add_local(ctx, self.cur_scope, self.relative_pos_in_parent, variable_id)?;
         assign_and_replace_next_stmt!(self, ctx, id.upcast().upcast());
         debug_assert_eq!(self.expr_parent, ExpressionParent::None);
         self.expr_parent = ExpressionParent::Memory(id);
         self.visit_assignment_expr(ctx, expr_id)?;
         self.expr_parent = ExpressionParent::None;
         Ok(())
+    }
     fn visit_local_channel_stmt(&mut self, ctx: &mut Ctx, id: ChannelStatementId) -> VisitorResult {
         let stmt = &ctx.heap[id];
         let from_id = stmt.from;
         let to_id = stmt.to;
         self.checked_add_local(ctx, self.cur_scope, self.relative_pos_in_parent, from_id)?;
         self.checked_add_local(ctx, self.cur_scope, self.relative_pos_in_parent, to_id)?;
         assign_and_replace_next_stmt!(self, ctx, id.upcast().upcast());
         Ok(())
+    }
     fn visit_labeled_stmt(&mut self, ctx: &mut Ctx, id: LabeledStatementId) -> VisitorResult {
         let stmt = &ctx.heap[id];
         let body_id = stmt.body;
         self.checked_add_label(ctx, self.relative_pos_in_parent, self.in_sync, id)?;
         self.visit_stmt(ctx, body_id)?;
         Ok(())
+    }
     fn visit_if_stmt(&mut self, ctx: &mut Ctx, id: IfStatementId) -> VisitorResult {
         let if_stmt = &ctx.heap[id];
         let end_if_id = if_stmt.end_if;
         let test_expr_id = if_stmt.test;
         let true_case = if_stmt.true_case;
         let false_case = if_stmt.false_case;
         // Visit test expression
         debug_assert_eq!(self.expr_parent, ExpressionParent::None);
         debug_assert!(self.in_test_expr.is_invalid());
         self.in_test_expr = id.upcast();
         self.expr_parent = ExpressionParent::If(id);
         self.visit_expr(ctx, test_expr_id)?;
         self.in_test_expr = StatementId::new_invalid();
@@ @@ -478,96 +475,100 @@ impl Visitor for PassValidationLinking { @@
         // Visit block statement. Note that we explicitly push the scope here
         // (and the `visit_block_stmt` will also push, but without effect) to
         // ensure the scope contains the sync ID.
         let sync_body = ctx.heap[id].body;
         debug_assert!(self.in_sync.is_invalid());
         self.in_sync = id;
         let old_scope = self.push_scope(ctx, false, scope_id);
         self.visit_stmt(ctx, sync_body)?;
         self.pop_scope(old_scope);
         assign_and_replace_next_stmt!(self, ctx, end_sync_id.upcast());
         self.in_sync = SynchronousStatementId::new_invalid();
         Ok(())
+    }
     fn visit_fork_stmt(&mut self, ctx: &mut Ctx, id: ForkStatementId) -> VisitorResult {
         let fork_stmt = &ctx.heap[id];
         let end_fork_id = fork_stmt.end_fork;
         let left_body_id = fork_stmt.left_body;
         let right_body_id = fork_stmt.right_body;
         // Fork statements may only occur inside sync blocks
         if self.in_sync.is_invalid() {
             return Err(ParseError::new_error_str_at_span(
                 &ctx.module().source, fork_stmt.span,
                 "Forking may only occur inside sync blocks"
             ));
+        }
         // Visit the respective bodies. Like the if statement, a fork statement
         // does not have a single static subsequent statement. It forks and then
         // each fork has a different next statement.
         assign_then_erase_next_stmt!(self, ctx, id.upcast());
         self.visit_stmt(ctx, left_body_id)?;
         assign_then_erase_next_stmt!(self, ctx, end_fork_id.upcast());
         if let Some(right_body_id) = right_body_id {
             self.visit_stmt(ctx, right_body_id)?;
             assign_then_erase_next_stmt!(self, ctx, end_fork_id.upcast());
+        }
         self.prev_stmt = end_fork_id.upcast();
         Ok(())
+    }
     fn visit_select_stmt(&mut self, ctx: &mut Ctx, id: SelectStatementId) -> VisitorResult {
         let select_stmt = &mut ctx.heap[id];
         select_stmt.relative_pos_in_parent = self.relative_pos_in_parent;
         self.relative_pos_in_parent += 1;
         let select_stmt = &ctx.heap[id];
         let end_select_id = select_stmt.end_select;
         // Select statements may only occur inside sync blocks
         if self.in_sync.is_invalid() {
             return Err(ParseError::new_error_str_at_span(
                 &ctx.module().source, select_stmt.span,
                 "select statements may only occur inside sync blocks"
             ));
+        }
         if !self.def_type.is_primitive() {
             return Err(ParseError::new_error_str_at_span(
                 &ctx.module().source, select_stmt.span,
                 "select statements may only be used in primitive components"
             ));
+        }
         // Visit the various arms in the select block
         let mut case_stmt_ids = self.statement_buffer.start_section();
         let mut case_scope_ids = self.scope_buffer.start_section();
         let num_cases = select_stmt.cases.len();
         for case in &select_stmt.cases {
             // We add them in pairs, so the subsequent for-loop retrieves in pairs
             case_stmt_ids.push(case.guard);
             case_stmt_ids.push(case.body);
             case_scope_ids.push(case.scope);
+        }
         assign_then_erase_next_stmt!(self, ctx, id.upcast());
         for index in 0..num_cases {
             let base_index = 2 * index;
             let guard_id     = case_stmt_ids[base_index];
             let case_body_id = case_stmt_ids[base_index + 1];
             let case_scope_id = case_scope_ids[index];
             // The guard statement ends up belonging to the block statement
             // following the arm. The reason we parse it separately is to
             // extract all of the "get" calls.
             let old_scope = self.push_scope(ctx, false, case_scope_id);
             // Visit the guard of this arm
             debug_assert!(self.in_select_guard.is_invalid());
             self.in_select_guard = id;
             self.in_select_arm = index as u32;
             self.visit_stmt(ctx, guard_id)?;
             self.in_select_guard = SelectStatementId::new_invalid();
@@ @@ -1310,100 +1311,96 @@ impl Visitor for PassValidationLinking { @@
             DefinedTypeVariant::Function(definition) => definition.arguments.len(),
             DefinedTypeVariant::Component(definition) => definition.arguments.len(),
             v => unreachable!("encountered {} type in call expression", v.type_class()),
         };
         let num_provided_args = call_expr.arguments.len();
         if num_provided_args != num_expected_args {
             let argument_text = if num_expected_args == 1 { "argument" } else { "arguments" };
             let call_span = call_expr.full_span;
             return Err(ParseError::new_error_at_span(
                 &ctx.module().source, call_span, format!(
                     "expected {} {}, but {} were provided",
                     num_expected_args, argument_text, num_provided_args
+                )
             ));
+        }
         // Recurse into all of the arguments and set the expression's parent
         let upcast_id = id.upcast();
         let section = self.expression_buffer.start_section_initialized(&call_expr.arguments);
         let old_expr_parent = self.expr_parent;
         call_expr.parent = old_expr_parent;
         call_expr.unique_id_in_definition = self.next_expr_index;
         self.next_expr_index += 1;
         for arg_expr_idx in 0..section.len() {
             let arg_expr_id = section[arg_expr_idx];
             self.expr_parent = ExpressionParent::Expression(upcast_id, arg_expr_idx as u32);
             self.visit_expr(ctx, arg_expr_id)?;
+        }
         section.forget();
         self.expr_parent = old_expr_parent;
         Ok(())
+    }
     fn visit_variable_expr(&mut self, ctx: &mut Ctx, id: VariableExpressionId) -> VisitorResult {
         let var_expr = &ctx.heap[id];
         // Check if declaration was already resolved (this occurs for the
         // variable expr that is on the LHS of the assignment expr that is
         // associated with a variable declaration)
         let mut variable_id = var_expr.declaration;
         let mut is_binding_target = false;
         // Otherwise try to find it
         if var_expr.identifier.value.as_str() == "new_value" {
             let a = 0; // TODO: REMOVE!
+        }
         if variable_id.is_none() {
             variable_id = self.find_variable(ctx, self.relative_pos_in_parent, &var_expr.identifier);
+        }
         // Otherwise try to see if is a variable introduced by a binding expr
         let variable_id = if let Some(variable_id) = variable_id {
             variable_id
         } else {
             if self.in_binding_expr.is_invalid() || !self.in_binding_expr_lhs {
                 return Err(ParseError::new_error_str_at_span(
                     &ctx.module().source, var_expr.identifier.span, "unresolved variable"
                 ));
+            }
             // This is a binding variable, but it may only appear in very
             // specific locations.
             let is_valid_binding = match self.expr_parent {
                 ExpressionParent::Expression(expr_id, idx) => {
                     match &ctx.heap[expr_id] {
                         Expression::Binding(_binding_expr) => {
                             // Nested binding is disallowed, and because of
                             // the check above we know we're directly at the
                             // LHS of the binding expression
                             debug_assert_eq!(_binding_expr.this, self.in_binding_expr);
                             debug_assert_eq!(idx, 0);
                             true
+                        }
                         Expression::Literal(lit_expr) => {
                             // Only struct, unions, tuples and arrays can
                             // have subexpressions, so we're always fine
                             if cfg!(debug_assertions) {
                                 match lit_expr.value {
                                     Literal::Struct(_) | Literal::Union(_) | Literal::Array(_) | Literal::Tuple(_) => {},
                                     _ => unreachable!(),
+                                }
+                            }
                             true
                         },
                         _ => false,
+                    }
                 },
                 _ => {
                     false
+                }
             };
             if !is_valid_binding {

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