scc

commit 4a0c2ccd2a49423967a9f0826bdfc012739327c7
parent eb8960812d92714eb568df36e09d8c76af5cd46c
Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
Date:   Mon,  7 Oct 2024 17:15:05 +0200

cc1: Reduce to unary for sizeof expressions

The grammar is clear and sizeof applies to a unary expression,
but the code was reducing to a cast expression, creating problems
with expresions like:

	sizeof "hello" - 1

or accepting invalid expressions like:

	sizeof (char *) 3

Diffstat:
M
src/cmd/cc/cc1/expr.c
 | 
6
+++---

1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/src/cmd/cc/cc1/expr.c b/src/cmd/cc/cc1/expr.c
@@ -843,7 +843,7 @@ typeof(Node *np)
 	return tp;
 }
 
-static Node *cast(void);
+static Node *unary(void), *cast(void);
 
 static Type *
 sizeexp(void)
@@ -851,7 +851,7 @@ sizeexp(void)
 	Type *tp;
 
 	if (!accept('('))
-		return typeof(cast());
+		return typeof(unary());
 
 	switch (yytoken) {
 	case TYPE:
@@ -859,7 +859,7 @@ sizeexp(void)
 		tp = typename();
 		break;
 	default:
-		tp = typeof(cast());
+		tp = typeof(unary());
 		break;
 	}
 	expect(')');