Librarify filter in liblttng-ctl and hide symbols

[lttng-tools.git] / src / lib / lttng-ctl / filter / filter-visitor-ir-check-binary-op-nesting.c

diff --git a/src/lib/lttng-ctl/filter/filter-visitor-ir-check-binary-op-nesting.c b/src/lib/lttng-ctl/filter/filter-visitor-ir-check-binary-op-nesting.c
new file mode 100644 (file)
index 0000000..bb9fd12
--- /dev/null
+++ b/src/lib/lttng-ctl/filter/filter-visitor-ir-check-binary-op-nesting.c
@@ -0,0 +1,83 @@
+/*
+ * filter-visitor-ir-check-binary-op-nesting.c
+ *
+ * LTTng filter IR check binary op nesting
+ *
+ * Copyright 2012 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License, version 2.1 only,
+ * as published by the Free Software Foundation.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <errno.h>
+#include <inttypes.h>
+#include "filter-ast.h"
+#include "filter-parser.h"
+#include "filter-ir.h"
+
+static
+int check_bin_op_nesting_recursive(struct ir_op *node, int nesting)
+{
+       switch (node->op) {
+       case IR_OP_UNKNOWN:
+       default:
+               fprintf(stderr, "[error] %s: unknown op type\n", __func__);
+               return -EINVAL;
+
+       case IR_OP_ROOT:
+               return check_bin_op_nesting_recursive(node->u.root.child,
+                               nesting);
+       case IR_OP_LOAD:
+               return 0;
+       case IR_OP_UNARY:
+               return check_bin_op_nesting_recursive(node->u.unary.child,
+                               nesting);
+       case IR_OP_BINARY:
+       {
+               int ret;
+
+               if (nesting > 0) {
+                       fprintf(stderr, "[error] Nesting of binary operators is not allowed, except for logical operators.\n");
+                       return -EINVAL;
+               }
+               ret = check_bin_op_nesting_recursive(node->u.binary.left,
+                               nesting++);
+               if (ret)
+                       return ret;
+               return check_bin_op_nesting_recursive(node->u.binary.right,
+                               nesting++);
+       }
+       case IR_OP_LOGICAL:
+       {
+               int ret;
+
+               ret = check_bin_op_nesting_recursive(node->u.logical.left,
+                               nesting);
+               if (ret)
+                       return ret;
+               return check_bin_op_nesting_recursive(node->u.logical.right,
+                               nesting);
+       }
+       }
+}
+
+__attribute__((visibility("hidden")))
+int filter_visitor_ir_check_binary_op_nesting(struct filter_parser_ctx *ctx)
+{
+       return check_bin_op_nesting_recursive(ctx->ir_root, 0);
+}