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1 | /* |
2 | * filter-visitor-ir-check-binary-op-nesting.c | |
3 | * | |
4 | * LTTng filter IR check binary op nesting | |
5 | * | |
6 | * Copyright 2012 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
7 | * | |
8 | * This library is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU Lesser General Public License, version 2.1 only, | |
10 | * as published by the Free Software Foundation. | |
11 | * | |
12 | * This library is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * Lesser General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU Lesser General Public License | |
18 | * along with this library; if not, write to the Free Software Foundation, | |
19 | * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
21 | ||
22 | #include <stdio.h> | |
23 | #include <unistd.h> | |
24 | #include <string.h> | |
25 | #include <stdlib.h> | |
26 | #include <assert.h> | |
27 | #include <errno.h> | |
28 | #include <inttypes.h> | |
29 | #include "filter-parser.h" | |
30 | #include "filter-ast.h" | |
31 | #include "filter-ir.h" | |
32 | ||
33 | static | |
34 | int check_bin_op_nesting_recursive(struct ir_op *node, int nesting) | |
35 | { | |
36 | switch (node->op) { | |
37 | case IR_OP_UNKNOWN: | |
38 | default: | |
39 | fprintf(stderr, "[error] %s: unknown op type\n", __func__); | |
40 | return -EINVAL; | |
41 | ||
42 | case IR_OP_ROOT: | |
43 | return check_bin_op_nesting_recursive(node->u.root.child, | |
44 | nesting); | |
45 | case IR_OP_LOAD: | |
46 | return 0; | |
47 | case IR_OP_UNARY: | |
48 | return check_bin_op_nesting_recursive(node->u.unary.child, | |
49 | nesting); | |
50 | case IR_OP_BINARY: | |
51 | { | |
52 | int ret; | |
53 | ||
54 | if (nesting > 0) { | |
55 | fprintf(stderr, "[error] Nesting of binary operators is not allowed, except for logical operators.\n"); | |
56 | return -EINVAL; | |
57 | } | |
58 | ret = check_bin_op_nesting_recursive(node->u.binary.left, | |
59 | nesting++); | |
60 | if (ret) | |
61 | return ret; | |
62 | return check_bin_op_nesting_recursive(node->u.binary.right, | |
63 | nesting++); | |
64 | } | |
65 | case IR_OP_LOGICAL: | |
66 | { | |
67 | int ret; | |
68 | ||
69 | ret = check_bin_op_nesting_recursive(node->u.logical.left, | |
70 | nesting); | |
71 | if (ret) | |
72 | return ret; | |
73 | return check_bin_op_nesting_recursive(node->u.logical.right, | |
74 | nesting); | |
75 | } | |
76 | } | |
77 | } | |
78 | ||
79 | int filter_visitor_ir_check_binary_op_nesting(struct filter_parser_ctx *ctx) | |
80 | { | |
81 | return check_bin_op_nesting_recursive(ctx->ir_root, 0); | |
82 | } |