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-rw-r--r--src/expression.c39
1 files changed, 39 insertions, 0 deletions
diff --git a/src/expression.c b/src/expression.c
index 393c1b2b..ee75284e 100644
--- a/src/expression.c
+++ b/src/expression.c
@@ -254,6 +254,45 @@ struct expr *symbol_expr_alloc(const struct location *loc,
return expr;
}
+static void variable_expr_print(const struct expr *expr,
+ struct output_ctx *octx)
+{
+ nft_print(octx, "$%s", expr->sym->identifier);
+}
+
+static void variable_expr_clone(struct expr *new, const struct expr *expr)
+{
+ new->scope = expr->scope;
+ new->sym = expr->sym;
+
+ expr->sym->refcnt++;
+}
+
+static void variable_expr_destroy(struct expr *expr)
+{
+ expr->sym->refcnt--;
+}
+
+static const struct expr_ops variable_expr_ops = {
+ .type = EXPR_VARIABLE,
+ .name = "variable",
+ .print = variable_expr_print,
+ .clone = variable_expr_clone,
+ .destroy = variable_expr_destroy,
+};
+
+struct expr *variable_expr_alloc(const struct location *loc,
+ struct scope *scope, struct symbol *sym)
+{
+ struct expr *expr;
+
+ expr = expr_alloc(loc, &variable_expr_ops, &invalid_type,
+ BYTEORDER_INVALID, 0);
+ expr->scope = scope;
+ expr->sym = sym;
+ return expr;
+}
+
static void constant_expr_print(const struct expr *expr,
struct output_ctx *octx)
{