scc

commit 39a9a94f23d063ab01dc3a03acf7331681072e5b
parent 058e5104f68f1a0d1a0da305c7e730b2d5adb392
Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
Date:   Tue,  9 Aug 2016 14:16:20 +0200

[cc1] handle correctly arrays in address()

When a address operator is applied to an array then we do not
want to decay the array, because we want a pointer to the array
itself, not to the first element of the array. In the same way,
an array is not a lvalue, but it is legal to take a pointer to it.

Diffstat:
M
cc1/expr.c
 | 
13
+++++++++----

1 file changed, 9 insertions(+), 4 deletions(-)
diff --git a/cc1/expr.c b/cc1/expr.c
@@ -566,16 +566,21 @@ incdec(Node *np, char op)
 static Node *
 address(char op, Node *np)
 {
-	Node *new, *left;
+	Node *new;
 
 	/*
 	 * ansi c accepts & applied to a function name, and it generates
 	 * a function pointer
 	 */
-	left = np->left;
-	if (np->op == OADDR && left->sym && left->type->op == FTN)
-		return np;
+	if (np->op == OSYM) {
+		if (np->type->op == FTN)
+			return decay(np);
+		if (np->type->op == ARY)
+			goto dont_check_lvalue;
+	}
 	chklvalue(np);
+
+dont_check_lvalue:
 	if (np->sym && (np->sym->flags & SREGISTER))
 		errorp("address of register variable '%s' requested", yytext);
 	if (np->op == OPTR) {