begin binary expressions

asm/amd64/amd64.go

@@ -51,8 +51,12 @@ func (f *Function) Emit() string {
 type Opcode string
 
 const (
-	Mov Opcode = "mov"
-	Ret Opcode = "ret"
+	Mov   Opcode = "mov"
+	Ret   Opcode = "ret"
+	Add   Opcode = "add"
+	Sub   Opcode = "sub"
+	Imull Opcode = "imul"
+	Idiv  Opcode = "idiv"
 )
 
 type Instruction struct {
@@ -113,3 +117,9 @@ type Imm int64
 func (i Imm) OperandString(size OperandSize) string {
 	return fmt.Sprintf("%d", i)
 }
+
+type Stack int64
+
+func (s Stack) OperandString(size OperandSize) string {
+	return fmt.Sprintf("rbp(%d)", s)
+}

ast/ast.go

@@ -73,3 +73,39 @@ type IntegerExpression struct {
 func (ie *IntegerExpression) expressionNode()      {}
 func (ie *IntegerExpression) TokenLiteral() string { return ie.Token.Literal }
 func (ie *IntegerExpression) String() string       { return ie.Token.Literal }
+
+//go:generate stringer -type=BinaryOperator
+type BinaryOperator int
+
+const (
+	Add BinaryOperator = iota
+	Subtract
+	Multiply
+	Divide
+)
+
+func (bo BinaryOperator) SymbolString() string {
+	switch bo {
+	case Add:
+		return "+"
+	case Subtract:
+		return "-"
+	case Multiply:
+		return "*"
+	case Divide:
+		return "/"
+	}
+	return "<INVALID BINARY OPERATOR>"
+}
+
+type BinaryExpression struct {
+	Token    token.Token // The operator
+	Lhs, Rhs Expression
+	Operator BinaryOperator
+}
+
+func (be *BinaryExpression) expressionNode()      {}
+func (be *BinaryExpression) TokenLiteral() string { return be.Token.Literal }
+func (be *BinaryExpression) String() string {
+	return fmt.Sprintf("%s %s %s", be.Lhs, be.Operator, be.Rhs)
+}

ast/binaryoperator_string.go

@@ -0,0 +1,26 @@
+// Code generated by "stringer -type=BinaryOperator"; DO NOT EDIT.
+
+package ast
+
+import "strconv"
+
+func _() {
+	// An "invalid array index" compiler error signifies that the constant values have changed.
+	// Re-run the stringer command to generate them again.
+	var x [1]struct{}
+	_ = x[Add-0]
+	_ = x[Subtract-1]
+	_ = x[Multiply-2]
+	_ = x[Divide-3]
+}
+
+const _BinaryOperator_name = "AddSubtractMultiplyDivide"
+
+var _BinaryOperator_index = [...]uint8{0, 3, 11, 19, 25}
+
+func (i BinaryOperator) String() string {
+	if i < 0 || i >= BinaryOperator(len(_BinaryOperator_index)-1) {
+		return "BinaryOperator(" + strconv.FormatInt(int64(i), 10) + ")"
+	}
+	return _BinaryOperator_name[_BinaryOperator_index[i]:_BinaryOperator_index[i+1]]
+}

cmd/cmd.go

@@ -23,29 +23,28 @@ type Arguments struct {
 	OnlyEmitAsm bool
 }
 
-// Prefix writer writes a prefix befor a call to an other writer
-// This Prefix is written befor each new line
-type prefixWriter struct {
+// Prefix writer writes a prefix before each new line from another io.Writer
+type PrefixWriter struct {
 	output              io.Writer
 	outputPrefix        []byte
 	outputPrefixWritten bool
 }
 
-func NewPrefixWriter(output io.Writer, prefix []byte) *prefixWriter {
-	return &prefixWriter{
+func NewPrefixWriter(output io.Writer, prefix []byte) *PrefixWriter {
+	return &PrefixWriter{
 		output:       output,
 		outputPrefix: prefix,
 	}
 }
 
-func NewPrefixWriterString(output io.Writer, prefix string) *prefixWriter {
-	return &prefixWriter{
+func NewPrefixWriterString(output io.Writer, prefix string) *PrefixWriter {
+	return &PrefixWriter{
 		output:       output,
 		outputPrefix: []byte(prefix),
 	}
 }
 
-func (w *prefixWriter) Write(p []byte) (n int, err error) {
+func (w *PrefixWriter) Write(p []byte) (n int, err error) {
 
 	toWrites := bytes.SplitAfter(p, []byte{'\n'})
 

go.mod

@@ -1,3 +1,6 @@
 module robaertschi.xyz/robaertschi/tt
 
 go 1.23.4
+
+require (
+)

go.sum

@@ -0,0 +1,6 @@
+golang.org/x/mod v0.22.0 h1:D4nJWe9zXqHOmWqj4VMOJhvzj7bEZg4wEYa759z1pH4=
+golang.org/x/mod v0.22.0/go.mod h1:6SkKJ3Xj0I0BrPOZoBy3bdMptDDU9oJrpohJ3eWZ1fY=
+golang.org/x/sync v0.10.0 h1:3NQrjDixjgGwUOCaF8w2+VYHv0Ve/vGYSbdkTa98gmQ=
+golang.org/x/sync v0.10.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
+golang.org/x/tools v0.29.0 h1:Xx0h3TtM9rzQpQuR4dKLrdglAmCEN5Oi+P74JdhdzXE=
+golang.org/x/tools v0.29.0/go.mod h1:KMQVMRsVxU6nHCFXrBPhDB8XncLNLM0lIy/F14RP588=

lexer/lexer.go

@@ -71,6 +71,14 @@ func (l *Lexer) NextToken() token.Token {
 		tok = l.newToken(token.OpenParen)
 	case ')':
 		tok = l.newToken(token.CloseParen)
+	case '+':
+		tok = l.newToken(token.Plus)
+	case '-':
+		tok = l.newToken(token.Minus)
+	case '*':
+		tok = l.newToken(token.Asterisk)
+	case '/':
+		tok = l.newToken(token.Slash)
 	case -1:
 		tok.Literal = ""
 		tok.Type = token.Eof

parser/parser.go

@@ -12,11 +12,18 @@ import (
 type precedence int
 
 const (
-	LOWEST precedence = iota
-	SUM
-	PRODUCT
+	PrecLowest precedence = iota
+	PrecSum
+	PrecProduct
 )
 
+var precedences = map[token.TokenType]precedence{
+	token.Plus:     PrecSum,
+	token.Minus:    PrecSum,
+	token.Asterisk: PrecProduct,
+	token.Slash:    PrecProduct,
+}
+
 type ErrorCallback func(token.Token, string, ...any)
 type prefixParseFn func() ast.Expression
 type infixParseFn func(ast.Expression) ast.Expression
@@ -40,6 +47,10 @@ func New(l *lexer.Lexer) *Parser {
 	p.registerPrefixFn(token.Int, p.parseIntegerExpression)
 
 	p.infixParseFns = make(map[token.TokenType]infixParseFn)
+	p.registerInfixFn(token.Plus, p.parseBinaryExpression)
+	p.registerInfixFn(token.Minus, p.parseBinaryExpression)
+	p.registerInfixFn(token.Asterisk, p.parseBinaryExpression)
+	p.registerInfixFn(token.Slash, p.parseBinaryExpression)
 
 	p.nextToken()
 	p.nextToken()
@@ -77,10 +88,14 @@ func (p *Parser) peekTokenIs(tt token.TokenType) bool {
 }
 
 func getPrecedence(tt token.TokenType) precedence {
-	switch tt {
-	default:
-		return LOWEST
+	if prec, ok := precedences[tt]; ok {
+		return prec
 	}
+	return PrecLowest
+}
+
+func (p *Parser) curPrecedence() precedence {
+	return getPrecedence(p.curToken.Type)
 }
 
 func (p *Parser) peekPrecedence() precedence {
@@ -161,7 +176,7 @@ func (p *Parser) parseDeclaration() ast.Declaration {
 	}
 
 	p.nextToken()
-	expr := p.parseExpression(LOWEST)
+	expr := p.parseExpression(PrecLowest)
 	if !p.expectPeek(token.Semicolon) {
 		return nil
 	}
@@ -212,3 +227,26 @@ func (p *Parser) parseIntegerExpression() ast.Expression {
 	int.Value = value
 	return int
 }
+
+func (p *Parser) parseBinaryExpression(lhs ast.Expression) ast.Expression {
+	var op ast.BinaryOperator
+	switch p.curToken.Type {
+	case token.Plus:
+		op = ast.Add
+	case token.Minus:
+		op = ast.Subtract
+	case token.Asterisk:
+		op = ast.Multiply
+	case token.Slash:
+		op = ast.Divide
+	default:
+		return p.exprError(p.curToken, "invalid token for binary expression %s", p.curToken.Type)
+	}
+	tok := p.curToken
+
+	precedence := p.curPrecedence()
+	p.nextToken()
+	rhs := p.parseExpression(precedence)
+
+	return &ast.BinaryExpression{Lhs: lhs, Rhs: rhs, Operator: op, Token: tok}
+}

tast/tast.go

@@ -8,6 +8,7 @@ import (
 	"fmt"
 	"strings"
 
+	"robaertschi.xyz/robaertschi/tt/ast"
 	"robaertschi.xyz/robaertschi/tt/token"
 	"robaertschi.xyz/robaertschi/tt/types"
 )
@@ -74,3 +75,19 @@ func (ie *IntegerExpression) Type() types.Type {
 }
 func (ie *IntegerExpression) TokenLiteral() string { return ie.Token.Literal }
 func (ie *IntegerExpression) String() string       { return ie.Token.Literal }
+
+type BinaryExpression struct {
+	Token      token.Token // The operator
+	Lhs, Rhs   Expression
+	Operator   ast.BinaryOperator
+	ResultType types.Type
+}
+
+func (be *BinaryExpression) expressionNode() {}
+func (be *BinaryExpression) Type() types.Type {
+	return be.ResultType
+}
+func (be *BinaryExpression) TokenLiteral() string { return be.Token.Literal }
+func (be *BinaryExpression) String() string {
+	return fmt.Sprintf("%s %s %s", be.Lhs, be.Operator, be.Rhs)
+}

test.tt

@@ -1 +1 @@
-fn main() = 0;
+fn main() = 35 + 34;

token/token.go

@@ -26,13 +26,17 @@ const (
 	Ident TokenType = "IDENT"
 	Int   TokenType = "INT"
 
-	Semicolon  = ";"
-	Equal      = "="
-	OpenParen  = "("
-	CloseParen = ")"
+	Semicolon  TokenType = ";"
+	Equal      TokenType = "="
+	OpenParen  TokenType = "("
+	CloseParen TokenType = ")"
+	Plus       TokenType = "+"
+	Minus      TokenType = "-"
+	Asterisk   TokenType = "*"
+	Slash      TokenType = "/"
 
 	// Keywords
-	Fn = "FN"
+	Fn TokenType = "FN"
 )
 
 func LookupKeyword(literal string) TokenType {

ttir/emit.go

@@ -1,6 +1,17 @@
 package ttir
 
-import "robaertschi.xyz/robaertschi/tt/tast"
+import (
+	"fmt"
+
+	"robaertschi.xyz/robaertschi/tt/tast"
+)
+
+var uniqueId int64
+
+func temp() string {
+	uniqueId += 1
+	return fmt.Sprintf("temp.%d", uniqueId)
+}
 
 func EmitProgram(program *tast.Program) *Program {
 	functions := make([]Function, 0)
@@ -29,6 +40,14 @@ func emitExpression(expr tast.Expression) (Operand, []Instruction) {
 	switch expr := expr.(type) {
 	case *tast.IntegerExpression:
 		return &Constant{Value: expr.Value}, []Instruction{}
+	case *tast.BinaryExpression:
+		lhsDst, instructions := emitExpression(expr.Lhs)
+		rhsDst, rhsInstructions := emitExpression(expr.Rhs)
+		instructions = append(instructions, rhsInstructions...)
+		dst := &Var{Value: temp()}
+		instructions = append(instructions, &Binary{Operator: expr.Operator, Lhs: lhsDst, Rhs: rhsDst, Dst: dst})
+		return dst, instructions
+
 	}
 	panic("unhandled tast.Expression case in ir emitter")
 }

ttir/ttir.go

@@ -3,6 +3,8 @@ package ttir
 import (
 	"fmt"
 	"strings"
+
+	"robaertschi.xyz/robaertschi/tt/ast"
 )
 
 type Program struct {
@@ -38,6 +40,18 @@ func (r *Ret) String() string {
 }
 func (r *Ret) instruction() {}
 
+type Binary struct {
+	Operator ast.BinaryOperator
+	Lhs      Operand
+	Rhs      Operand
+	Dst      Operand
+}
+
+func (b *Binary) String() string {
+	return fmt.Sprintf("%s = %s %s, %s", b.Dst, b.Operator, b.Lhs, b.Rhs)
+}
+func (b *Binary) instruction() {}
+
 type Operand interface {
 	String() string
 	operand()
@@ -51,3 +65,12 @@ func (c *Constant) String() string {
 	return fmt.Sprintf("%d", c.Value)
 }
 func (c *Constant) operand() {}
+
+type Var struct {
+	Value string
+}
+
+func (v *Var) String() string {
+	return v.Value
+}
+func (v *Var) operand() {}

typechecker/checker.go

@@ -7,6 +7,7 @@ import (
 	"robaertschi.xyz/robaertschi/tt/ast"
 	"robaertschi.xyz/robaertschi/tt/tast"
 	"robaertschi.xyz/robaertschi/tt/token"
+	"robaertschi.xyz/robaertschi/tt/types"
 )
 
 type Checker struct {
@@ -66,6 +67,20 @@ func (c *Checker) checkExpression(expr ast.Expression) (tast.Expression, error)
 		return &tast.IntegerExpression{Token: expr.Token, Value: expr.Value}, nil
 	case *ast.ErrorExpression:
 		return nil, c.error(expr.InvalidToken, "invalid expression")
+	case *ast.BinaryExpression:
+		lhs, lhsErr := c.checkExpression(expr.Lhs)
+		rhs, rhsErr := c.checkExpression(expr.Rhs)
+		var operandErr error
+		var resultType types.Type
+		if lhsErr == nil && rhsErr == nil {
+			if !lhs.Type().IsSameType(rhs.Type()) {
+				operandErr = fmt.Errorf("the lhs of the expression does not have the same type then the rhs, lhs=%q, rhs=%q", lhs.Type(), rhs.Type())
+			} else {
+				resultType = lhs.Type()
+			}
+		}
+
+		return &tast.BinaryExpression{Lhs: lhs, Rhs: rhs, Operator: expr.Operator, Token: expr.Token, ResultType: resultType}, errors.Join(lhsErr, rhsErr, operandErr)
 	}
 	return nil, fmt.Errorf("unhandled expression in type checker")
 }