doc/examples/clockdiv.fut

@@ -1,4 +1,4 @@
-proc clockdiv_2 (
+module clockdiv_2 (
 	clk: Logic,
 	rst: Logic
 ) -> Logic

doc/examples/comparator.fut

@@ -1,7 +1,7 @@
-comb comparator (
+module comparator (
 	a: Logic<8>,
 	b: Logic<8>
 ) -> Logic
 {
-	~reduce_or(a ^ b)
+	assign eq = ~reduce_or(a ^ b);
 }

doc/examples/halfadd.fut

@@ -1,12 +1,8 @@
-struct Add {
+module halfadd (
-	sum: Logic,
-	carry: Logic
-}
-
-comb halfadd (
 	a: Logic,
 	b: Logic
-) -> Add
+) -> (Logic, Logic)
 {
-	Add{sum: a ^ b, carry: a & b}
+	assign sum = a ^ b;
+	assign carry = a & b;
 }

lib/builtins/main.hyd

@@ -1,6 +1,6 @@
 
 
-comb reduce_or (
+module reduce_or (
 	a: Logic
 	)
 	-> Logic<1> {

src/frontend.rs

@@ -2,7 +2,6 @@ use std::collections::BTreeMap;
 
 use crate::builtin_cells::get_builtins;
 use crate::parser;
-use crate::parser::expression::Expression;
 use crate::rtlil;
 use crate::rtlil::RtlilWrite;
 pub use callable::Callable;
@@ -170,59 +169,70 @@ fn lower_process(
     Ok(())
 }
 
-fn desugar_binop<'a>(op: parser::expression::BinOp<'a>) -> parser::expression::Call<'a> {
+fn desugar_operation<'a>(op: parser::Operation<'a>) -> parser::Call<'a> {
-    let a = desugar_expression(op.a);
+    match op {
-    let b = desugar_expression(op.b);
+        parser::Operation::And { a, b } => {
-    let op_func = match op.kind {
+            let a = desugar_expression(a);
-        parser::expression::BinOpKind::And => "and",
+            let b = desugar_expression(b);
-        parser::expression::BinOpKind::Or => "or",
+            parser::Call {
-        parser::expression::BinOpKind::Xor => "xor",
+                name: "and".into(),
-    };
-    parser::expression::Call {
-        name: op_func.into(),
                 args: vec![a, b],
             }
         }
-
+        parser::Operation::Or { a, b } => {
-fn desugar_unop<'a>(op: parser::expression::UnOp<'a>) -> parser::expression::Call<'a> {
+            let a = desugar_expression(a);
-    let a = desugar_expression(op.a);
+            let b = desugar_expression(b);
-    let op_func = match op.kind {
+            parser::Call {
-        parser::expression::UnOpKind::BitNot => "not",
+                name: "or".into(),
-        parser::expression::UnOpKind::Not => todo!(),
+                args: vec![a, b],
-    };
+            }
-    parser::expression::Call {
+        }
-        name: op_func.into(),
+        parser::Operation::Xor { a, b } => {
+            let a = desugar_expression(a);
+            let b = desugar_expression(b);
+            parser::Call {
+                name: "xor".into(),
+                args: vec![a, b],
+            }
+        }
+        parser::Operation::Not(a) => {
+            let a = desugar_expression(a);
+            parser::Call {
+                name: "not".into(),
                 args: vec![a],
             }
         }
+    }
+}
 
-fn desugar_expression<'a>(expr: Expression<'a>) -> Expression<'a> {
+fn desugar_expression<'a>(expr: parser::Expression<'a>) -> parser::Expression<'a> {
     // TODO: allow ergonomic traversal of AST
     match expr {
-        Expression::Path(_) => expr,
+        parser::Expression::Ident(_) => expr,
-        Expression::Literal(_) => expr,
+        parser::Expression::Literal(_) => expr,
-        Expression::Call(mut call) => {
+        parser::Expression::Call(mut call) => {
             let new_args = call.args.into_iter().map(desugar_expression).collect();
             call.args = new_args;
-            Expression::Call(call)
+            parser::Expression::Call(call)
+        }
+        parser::Expression::Operation(op) => {
+            parser::Expression::Call(Box::new(desugar_operation(*op)))
         }
-        Expression::BinOp(op) => Expression::Call(Box::new(desugar_binop(*op))),
-        Expression::UnOp(op) => Expression::Call(Box::new(desugar_unop(*op))),
     }
 }
 
 fn lower_expression(
     ctx: &Context,
     module: &mut rtlil::Module,
-    expr: &Expression,
+    expr: &parser::Expression,
 ) -> Result<rtlil::SigSpec, CompileError> {
     let expr = desugar_expression(expr.clone());
     match expr {
-        Expression::Path(ident) => {
+        parser::Expression::Ident(ident) => {
             let signal = ctx.try_get_signal(ident)?;
             Ok(signal.sigspec())
         }
-        Expression::Call(call) => {
+        parser::Expression::Call(call) => {
             let args_resolved = call
                 .args
                 .iter()
@@ -258,12 +268,8 @@ fn lower_expression(
         }
         // TODO: instantiate operators directly here instead of desugaring, once the callable infrastructure improves
         // to get better errors
-        Expression::Literal(lit) => Ok(rtlil::SigSpec::Const(
+        parser::Expression::Operation(_op) => todo!("operators not yet implemented"),
-            lit.span().fragment().parse().unwrap(),
+        parser::Expression::Literal(lit) => Ok(rtlil::SigSpec::Const(lit as i64, TODO_WIDTH)),
-            TODO_WIDTH,
-        )),
-        Expression::UnOp(_) => todo!(),
-        Expression::BinOp(_) => todo!(),
     }
 }
 
@@ -278,39 +284,6 @@ fn lower_assignment(
     Ok(())
 }
 
-fn lower_comb(
-    ctx: &mut Context,
-    module: &mut rtlil::Module,
-    pa_comb: parser::comb::CombBlock,
-) -> Result<(), CompileError> {
-    for (num, port) in pa_comb.ports.iter().enumerate() {
-        let port_id = make_pubid(port.net.name.fragment());
-        module.add_wire(rtlil::Wire::new(
-            port_id.clone(),
-            TODO_WIDTH,
-            Some(rtlil::PortOption::Input((num + 1) as i32)),
-        ));
-        let typ = TypeStruct::logic_width(TODO_WIDTH);
-        let signal = Signal {
-            name: port.net.name.fragment().to_string(),
-            il_id: port_id,
-            // TODO: CRIMES CRIMES CRIMES
-            typ: Box::leak(Box::new(typ)),
-        };
-        ctx.signals
-            .insert(port.net.name.fragment().to_string(), signal);
-    }
-    let ret_id = module.make_genid("ret");
-    module.add_wire(rtlil::Wire::new(
-        ret_id.clone(),
-        TODO_WIDTH,
-        Some(rtlil::PortOption::Input(99)),
-    ));
-    let out_sig = lower_expression(ctx, module, &pa_comb.expr)?;
-    module.add_connection(&rtlil::SigSpec::Wire(ret_id), &out_sig);
-    Ok(())
-}
-
 pub fn lower_module(pa_module: parser::Module) -> Result<String, CompileError> {
     let mut writer = rtlil::ILWriter::new();
     let mut ir_module = rtlil::Module::new(make_pubid("test"));
@@ -324,13 +297,38 @@ pub fn lower_module(pa_module: parser::Module) -> Result<String, CompileError> {
     };
 
     writer.write_line("autoidx 1");
+    /*
+    for (idx, port) in pa_module.ports.iter().enumerate() {
+        // FIXME: Actually resolve types
+        let sigtype = TypeStruct::logic_width(TODO_WIDTH);
+        // FIXME: CRIMES CRIMES CRIMES
+        let sigtype = Box::leak(Box::new(sigtype));
+        let sig = Signal {
+            name: port.net.name.fragment().to_string(),
+            il_id: make_pubid(port.net.name.fragment()),
+            typ: sigtype,
+        };
+        let sig = context
+            .signals
+            .entry(port.net.name.fragment().to_string())
+            .or_insert(sig);
+
+        let dir_option = match port.direction {
+            parser::PortDirection::Input => rtlil::PortOption::Input(idx as i32 + 1),
+            parser::PortDirection::Output => rtlil::PortOption::Output(idx as i32 + 1),
+        };
+        let wire = rtlil::Wire::new(sig.il_id.to_owned(), TODO_WIDTH, Some(dir_option));
+        ir_module.add_wire(wire);
+    }
     for item in pa_module.items {
         match item {
-            parser::ModuleItem::Comb(comb) => lower_comb(&mut context, &mut ir_module, comb)?,
+            parser::ModuleItem::Assign(assignment) => {
-            parser::ModuleItem::Proc(_) => todo!(),
+                lower_assignment(&context, &mut ir_module, assignment)?
-            parser::ModuleItem::State(_) => todo!(),
+            }
+            parser::ModuleItem::Proc(proc) => lower_process(&context, &mut ir_module, &proc)?,
         }
     }
     ir_module.write_rtlil(&mut writer);
+    */
     Ok(writer.finish())
 }

src/parser/comb.rs

@@ -1,6 +1,4 @@
 use super::{
-    declaration::TypeName,
-    expression::{expression, Expression},
     module::inputs_list,
     module::PortDecl,
     tokens::{token, TokenKind as tk, TokenSpan},
@@ -18,8 +16,6 @@ use nom::{
 pub struct CombBlock<'a> {
     pub name: Span<'a>,
     pub ports: Vec<PortDecl<'a>>,
-    pub ret: TypeName<'a>,
-    pub expr: Expression<'a>,
 }
 
 pub fn comb_block(input: TokenSpan) -> IResult<TokenSpan, CombBlock> {
@@ -30,15 +26,17 @@ pub fn comb_block(input: TokenSpan) -> IResult<TokenSpan, CombBlock> {
                 token(tk::Ident),
                 delimited(token(tk::LParen), inputs_list, token(tk::RParen)),
                 preceded(token(tk::RArrow), typename),
-                delimited(token(tk::LBrace), expression, token(tk::RBrace)),
+                delimited(
+                    token(tk::LBrace),
+                    many0(token(tk::Error)),
+                    token(tk::RBrace),
+                ),
             ))),
         ),
-        |(name, inputs, ret, expr)| CombBlock {
+        |(name, inputs, _ret, _items)| CombBlock {
             // TODO: bring back returns
             name: name.span(),
             ports: inputs,
-            ret,
-            expr,
         },
     )(input)
 }

src/parser/expression.rs

@@ -1,4 +1,4 @@
-use super::tokens::{token, Token, TokenKind as tk, TokenSpan};
+use super::tokens::{token, TokenKind as tk, TokenSpan};
 use super::{IResult, Span};
 use nom::{
     branch::alt,
@@ -7,95 +7,48 @@ use nom::{
     sequence::{delimited, preceded, separated_pair, tuple},
 };
 
+#[derive(Debug, Clone)]
+pub enum Operation<'a> {
+    And {
+        a: Expression<'a>,
+        b: Expression<'a>,
+    },
+    Or {
+        a: Expression<'a>,
+        b: Expression<'a>,
+    },
+    Xor {
+        a: Expression<'a>,
+        b: Expression<'a>,
+    },
+    Not(Expression<'a>),
+}
+
+pub fn operation(input: TokenSpan) -> IResult<TokenSpan, Operation> {
+    // temporarily given up on before I learn the shunting yard algorithm
+    alt((
+        map(
+            separated_pair(expression_nonrecurse, token(tk::BitAnd), expression),
+            |(a, b)| Operation::And { a, b },
+        ),
+        map(
+            separated_pair(expression_nonrecurse, token(tk::BitOr), expression),
+            |(a, b)| Operation::Or { a, b },
+        ),
+        map(
+            separated_pair(expression_nonrecurse, token(tk::BitXor), expression),
+            |(a, b)| Operation::Xor { a, b },
+        ),
+        map(preceded(token(tk::BitNot), expression), Operation::Not),
+    ))(input)
+}
+
 #[derive(Debug, Clone)]
 pub struct Call<'a> {
     pub name: Span<'a>,
     pub args: Vec<Expression<'a>>,
 }
 
-#[derive(Debug, Clone)]
-pub enum BinOpKind {
-    And,
-    Or,
-    Xor,
-}
-
-#[derive(Debug, Clone)]
-pub enum UnOpKind {
-    Not,
-    BitNot,
-}
-
-#[derive(Debug, Clone)]
-pub struct BinOp<'a> {
-    pub a: Expression<'a>,
-    pub b: Expression<'a>,
-    pub kind: BinOpKind,
-}
-
-#[derive(Debug, Clone)]
-pub struct UnOp<'a> {
-    pub a: Expression<'a>,
-    pub kind: UnOpKind,
-}
-
-#[derive(Debug, Clone)]
-pub enum Expression<'a> {
-    Path(&'a str),
-    Literal(Token<'a>),
-    UnOp(Box<UnOp<'a>>),
-    BinOp(Box<BinOp<'a>>),
-    Call(Box<Call<'a>>),
-}
-
-/// expressions that can't be subdivided further
-fn atom(input: TokenSpan) -> IResult<TokenSpan, Expression> {
-    alt((
-        map(call_item, |call| Expression::Call(Box::new(call))),
-        map(token(tk::Ident), |it| {
-            Expression::Path(it.span().fragment())
-        }),
-        map(token(tk::Number), Expression::Literal),
-        delimited(token(tk::LParen), expression, token(tk::RParen)),
-    ))(input)
-}
-
-fn unop_kind(input: TokenSpan) -> IResult<TokenSpan, UnOpKind> {
-    alt((
-        map(token(tk::Not), |_| UnOpKind::Not),
-        map(token(tk::BitNot), |_| UnOpKind::BitNot),
-    ))(input)
-}
-
-/// unary expressions e.g `~expr`, `!expr`
-fn unary(input: TokenSpan) -> IResult<TokenSpan, Expression> {
-    alt((
-        map(tuple((unop_kind, unary)), |(kind, expr)| {
-            Expression::UnOp(Box::new(UnOp { a: expr, kind }))
-        }),
-        atom,
-    ))(input)
-}
-
-fn bitop_kind(input: TokenSpan) -> IResult<TokenSpan, BinOpKind> {
-    alt((
-        map(token(tk::BitXor), |_| BinOpKind::Xor),
-        map(token(tk::BitOr), |_| BinOpKind::Xor),
-        map(token(tk::BitAnd), |_| BinOpKind::Xor),
-    ))(input)
-}
-
-/// bit and, or, xor e.g. a ^ b & c
-/// TODO: make precedence rules for bit ops
-fn bitop(input: TokenSpan) -> IResult<TokenSpan, Expression> {
-    alt((
-        map(tuple((unary, bitop_kind, bitop)), |(a, kind, b)| {
-            Expression::BinOp(Box::new(BinOp { a, b, kind }))
-        }),
-        unary,
-    ))(input)
-}
-
 pub fn call_item(input: TokenSpan) -> IResult<TokenSpan, Call> {
     map(
         tuple((
@@ -113,54 +66,32 @@ pub fn call_item(input: TokenSpan) -> IResult<TokenSpan, Call> {
     )(input)
 }
 
+#[derive(Debug, Clone)]
+pub enum Expression<'a> {
+    Ident(&'a str),
+    Literal(u64),
+    Call(Box<Call<'a>>),
+    Operation(Box<Operation<'a>>),
+}
+
 /// parser combinators can not parse left-recursive grammars. To work around this, we split
 /// expressions into a recursive and non-recursive portion.
 /// Parsers reachable from this point must call expression_nonrecurse instead
 pub fn expression(input: TokenSpan) -> IResult<TokenSpan, Expression> {
-    bitop(input)
+    alt((
+        map(operation, |op| Expression::Operation(Box::new(op))),
+        expression_nonrecurse,
+    ))(input)
 }
 
-#[cfg(test)]
+/// the portion of the expression grammar that can be parsed without left recursion
-mod test {
+fn expression_nonrecurse(input: TokenSpan) -> IResult<TokenSpan, Expression> {
-    use super::*;
+    alt((
-    use crate::parser::tokens::{lex, Token, TokenSpan};
+        map(token(tk::Number), |_| Expression::Literal(42)),
-    use crate::parser::Span;
+        map(call_item, |call| Expression::Call(Box::new(call))),
-    use nom::combinator::all_consuming;
+        map(token(tk::Ident), |ident| {
-
+            Expression::Ident(*ident.span().fragment())
-    fn tok(input: &'static str) -> Vec<Token> {
+        }),
-        let input = Span::from(input);
+        delimited(token(tk::LParen), expression, token(tk::RParen)),
-        lex(input).unwrap().1
+    ))(input)
-    }
-
-    fn fullexpr(input: TokenSpan) -> IResult<TokenSpan, Expression> {
-        all_consuming(expression)(input)
-    }
-
-    #[test]
-    fn test_atoms() {
-        fullexpr(TokenSpan::new(&tok("a"))).unwrap();
-        fullexpr(TokenSpan::new(&tok("(a)"))).unwrap();
-    }
-
-    #[test]
-    fn test_unary() {
-        fullexpr(TokenSpan::new(&tok("asdf"))).unwrap();
-        fullexpr(TokenSpan::new(&tok("~(asdf)"))).unwrap();
-        fullexpr(TokenSpan::new(&tok("!asdf"))).unwrap();
-        // unary(TokenSpan::new(&tok("~!(asdf)"))).unwrap();
-    }
-
-    #[test]
-    fn test_bitop() {
-        fullexpr(TokenSpan::new(&tok("a | b"))).unwrap();
-        fullexpr(TokenSpan::new(&tok("a ^ b"))).unwrap();
-        fullexpr(TokenSpan::new(&tok("~(a ^ b)"))).unwrap();
-        fullexpr(TokenSpan::new(&tok("a ^ !b"))).unwrap();
-        fullexpr(TokenSpan::new(&tok("a & !b & c"))).unwrap();
-    }
-
-    #[test]
-    fn test_call() {
-        fullexpr(TokenSpan::new(&tok("a()"))).unwrap();
-    }
 }

src/parser/mod.rs

@@ -20,6 +20,7 @@ pub type IResult<I, O, E = IErr<I>> = nom::IResult<I, O, E>;
 pub use crate::parser::declaration::{
     assign_statement, declaration, typename, Assign, NetDecl, TypeName,
 };
+pub use crate::parser::expression::{expression, Call, Expression, Operation};
 pub use crate::parser::module::{module, Module, ModuleItem, PortDirection};
 use crate::parser::tokens::TokenSpan;
 use nom::combinator::all_consuming;
@@ -27,3 +28,36 @@ use nom::combinator::all_consuming;
 pub fn parse(input: TokenSpan) -> IResult<TokenSpan, Module> {
     all_consuming(module)(input)
 }
+
+#[cfg(test)]
+mod test {
+    use super::*;
+    use nom::combinator::all_consuming;
+
+    #[test]
+    fn test_operation() {
+        operation(" a | b ".into()).unwrap();
+        operation(" a & b ".into()).unwrap();
+    }
+
+    #[test]
+    fn test_expression() {
+        expression(" a ".into()).unwrap();
+        expression(" a | b ".into()).unwrap();
+        expression(" a | b | c ".into()).unwrap();
+    }
+
+    #[test]
+    fn test_assignment() {
+        // TODO: make wrapper and use for all tests
+        all_consuming(assign_statement)(" a = b ".into()).unwrap();
+        all_consuming(assign_statement)(" a = b | c ".into()).unwrap();
+    }
+
+    #[test]
+    fn test_call() {
+        call_item("thing ( )".into()).unwrap();
+        call_item("thing ( a , b , c )".into()).unwrap();
+        call_item("thing(a,b,c)".into()).unwrap();
+    }
+}

src/parser/module.rs

@@ -10,7 +10,7 @@ use crate::parser::{
     declaration,
     proc::ProcBlock,
     tokens::{token, TokenKind as tk, TokenSpan},
-    IResult, NetDecl,
+    IResult, NetDecl, Span,
 };
 
 #[derive(Debug)]
@@ -57,3 +57,25 @@ pub fn module(input: TokenSpan) -> IResult<TokenSpan, Module> {
         |items| Module { items },
     )(input)
 }
+
+#[cfg(test)]
+mod test {
+    use super::*;
+    use nom::combinator::all_consuming;
+
+    #[test]
+    fn test_decl() {
+        declaration("reg abcd".into()).unwrap();
+    }
+
+    #[test]
+    fn test_assignment_item() {
+        all_consuming(assign_item)(" assign a = b ; ".into()).unwrap();
+        all_consuming(assign_item)(" assign a = b | c ; ".into()).unwrap();
+    }
+
+    #[test]
+    fn test_module_item() {
+        all_consuming(module_item)(" assign a = b ;".into()).unwrap();
+    }
+}

src/parser/proc.rs

@@ -8,9 +8,8 @@ use nom::{
 
 use crate::parser::{
     assign_statement, expression,
-    expression::{expression, Expression},
     tokens::{token, TokenKind as tk, TokenSpan},
-    Assign, IResult, Span,
+    Assign, Expression, IResult, Span,
 };
 
 #[derive(Debug)]
@@ -92,3 +91,29 @@ pub fn proc_block(input: TokenSpan) -> IResult<TokenSpan, ProcBlock> {
         ),
     )(input)
 }
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn test_statement() {
+        proc_statement(" abc = def ".into()).unwrap();
+    }
+
+    #[test]
+    fn test_match_arm() {
+        match_arm(" 1 => abc = def ".into()).unwrap();
+    }
+
+    #[test]
+    fn test_match_block() {
+        let input = "
+        match (asdf) {
+            1 => a = 0,
+            2 => c = ~d
+        }
+        ";
+        match_block(input.into()).unwrap();
+    }
+}

src/parser/tokens.rs

@@ -3,7 +3,7 @@
 use super::{
     error::{Error, InputPos},
     literals::{identifier, ws0},
-    IResult, Span,
+    IErr, IResult, Span,
 };
 use nom::{
     branch::alt,
@@ -70,7 +70,6 @@ pub enum TokenKind {
     BitOr,
     BitXor,
     EqAssign,
-    Not,
     // Multi Chars
     FatArrow,
     RArrow,
@@ -205,7 +204,6 @@ fn lex_punctuation(input: Span) -> IResult<Span, Token> {
             map(tag("&"), |_| TokenKind::BitAnd),
             map(tag("^"), |_| TokenKind::BitXor),
             map(tag("|"), |_| TokenKind::BitOr),
-            map(tag("!"), |_| TokenKind::Not),
             map(tag("="), |_| TokenKind::EqAssign),
         ))),
         |(span, kind)| Token::new(span, kind),