[PATCH 3/5] add helper: valid_expr_subtype()

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Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@xxxxxxxxx>
---
 evaluate.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/evaluate.c b/evaluate.c
index 649e132b8..0394dcbb9 100644
--- a/evaluate.c
+++ b/evaluate.c
@@ -47,6 +47,17 @@ struct symbol *current_fn;
 static struct symbol *degenerate(struct expression *expr);
 static struct symbol *evaluate_symbol(struct symbol *sym);
 
+static inline int valid_expr_type(struct expression *expr)
+{
+	return expr && valid_type(expr->ctype);
+}
+
+static inline int valid_expr_subtype(struct expression *expr)
+{
+	return valid_expr_type(expr->left)
+	    && valid_expr_type(expr->right);
+}
+
 static struct symbol *evaluate_symbol_expression(struct expression *expr)
 {
 	struct expression *addr;
-- 
2.14.0

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