| 1 | /* |
| 2 | * filter.c |
| 3 | * |
| 4 | * LTTng filter bytecode utilities. |
| 5 | * |
| 6 | * Copyright 2016 - Jérémie Galarneau <jeremie.galarneau@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 "filter.h" |
| 23 | #include <stddef.h> |
| 24 | |
| 25 | struct bytecode_symbol_iterator { |
| 26 | /* No ownership of bytecode is taken. */ |
| 27 | char *bytecode; |
| 28 | size_t offset, len; |
| 29 | }; |
| 30 | |
| 31 | LTTNG_HIDDEN |
| 32 | struct bytecode_symbol_iterator *bytecode_symbol_iterator_create( |
| 33 | struct lttng_filter_bytecode *bytecode) |
| 34 | { |
| 35 | struct bytecode_symbol_iterator *it = NULL; |
| 36 | |
| 37 | if (!bytecode) { |
| 38 | goto end; |
| 39 | } |
| 40 | |
| 41 | it = zmalloc(sizeof(*it)); |
| 42 | if (!it) { |
| 43 | goto end; |
| 44 | } |
| 45 | |
| 46 | it->bytecode = bytecode->data; |
| 47 | it->offset = bytecode->reloc_table_offset; |
| 48 | it->len = bytecode->len; |
| 49 | end: |
| 50 | return it; |
| 51 | } |
| 52 | |
| 53 | LTTNG_HIDDEN |
| 54 | int bytecode_symbol_iterator_next(struct bytecode_symbol_iterator *it) |
| 55 | { |
| 56 | int ret; |
| 57 | size_t len; |
| 58 | |
| 59 | if (!it || it->offset >= it->len) { |
| 60 | ret = -1; |
| 61 | goto end; |
| 62 | } |
| 63 | |
| 64 | len = strlen(it->bytecode + it->offset + sizeof(uint16_t)) + 1; |
| 65 | it->offset += len + sizeof(uint16_t); |
| 66 | ret = it->offset >= it->len ? -1 : 0; |
| 67 | end: |
| 68 | return ret; |
| 69 | } |
| 70 | |
| 71 | LTTNG_HIDDEN |
| 72 | int bytecode_symbol_iterator_get_type(struct bytecode_symbol_iterator *it) |
| 73 | { |
| 74 | int ret; |
| 75 | |
| 76 | if (!it) { |
| 77 | ret = -1; |
| 78 | goto end; |
| 79 | } |
| 80 | |
| 81 | ret = *((uint16_t *) (it->bytecode + it->offset)); |
| 82 | end: |
| 83 | return ret; |
| 84 | } |
| 85 | |
| 86 | LTTNG_HIDDEN |
| 87 | const char *bytecode_symbol_iterator_get_name( |
| 88 | struct bytecode_symbol_iterator *it) |
| 89 | { |
| 90 | const char *ret = NULL; |
| 91 | |
| 92 | if (!it) { |
| 93 | goto end; |
| 94 | } |
| 95 | |
| 96 | ret = it->bytecode + it->offset + sizeof(uint16_t); |
| 97 | end: |
| 98 | return ret; |
| 99 | } |
| 100 | |
| 101 | LTTNG_HIDDEN |
| 102 | void bytecode_symbol_iterator_destroy(struct bytecode_symbol_iterator *it) |
| 103 | { |
| 104 | free(it); |
| 105 | } |