Switch to signature-based extern function declarations

1 files changed, 21 insertions, 1 deletions

diff --git a/expression.go b/expression.go
index 6ab30c2..76cb16b 100644
--- a/expression.go
+++ b/expression.go
@@ -41,7 +41,6 @@ func (l linkage) String() string {
 
 type functionExpr struct {
 	link       linkage
-	external   bool
 	name       string
 	params     *paramExpr
 	returnType string
@@ -77,6 +76,27 @@ func (p *paramExpr) String() string {
 	return s
 }
 
+type externFuncExpr struct {
+	name       string
+	params     *signatureExpr
+	returnType string
+	ln         int
+}
+
+func (e *externFuncExpr) markExpr() {}
+
+func (e *externFuncExpr) line() int { return e.ln }
+
+type signatureExpr struct {
+	typ  string
+	next *signatureExpr
+	ln   int
+}
+
+func (s *signatureExpr) markExpr() {}
+
+func (s *signatureExpr) line() int { return s.ln }
+
 type blockExpr struct {
 	stmts []statementExpr
 	ln    int