src/common/filter.c

   1 /*
   2  * Copyright 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com>
   3  *
   4  * SPDX-License-Identifier: LGPL-2.1-only
   5  *
   6  */
   7
   8 #include "filter.h"
   9 #include <stddef.h>
  10
  11 struct bytecode_symbol_iterator {
  12         /* No ownership of bytecode is taken. */
  13         char *bytecode;
  14         size_t offset, len;
  15 };
  16
  17 LTTNG_HIDDEN
  18 struct bytecode_symbol_iterator *bytecode_symbol_iterator_create(
  19                 struct lttng_filter_bytecode *bytecode)
  20 {
  21         struct bytecode_symbol_iterator *it = NULL;
  22
  23         if (!bytecode) {
  24                 goto end;
  25         }
  26
  27         it = zmalloc(sizeof(*it));
  28         if (!it) {
  29                 goto end;
  30         }
  31
  32         it->bytecode = bytecode->data;
  33         it->offset = bytecode->reloc_table_offset;
  34         it->len = bytecode->len;
  35 end:
  36         return it;
  37 }
  38
  39 LTTNG_HIDDEN
  40 int bytecode_symbol_iterator_next(struct bytecode_symbol_iterator *it)
  41 {
  42         int ret;
  43         size_t len;
  44
  45         if (!it || it->offset >= it->len) {
  46                 ret = -1;
  47                 goto end;
  48         }
  49
  50         len = strlen(it->bytecode + it->offset + sizeof(uint16_t)) + 1;
  51         it->offset += len + sizeof(uint16_t);
  52         ret = it->offset >= it->len ? -1 : 0;
  53 end:
  54         return ret;
  55 }
  56
  57 LTTNG_HIDDEN
  58 int bytecode_symbol_iterator_get_type(struct bytecode_symbol_iterator *it)
  59 {
  60         int ret;
  61
  62         if (!it) {
  63                 ret = -1;
  64                 goto end;
  65         }
  66
  67         ret = *((uint16_t *) (it->bytecode + it->offset));
  68 end:
  69         return ret;
  70  }
  71
  72 LTTNG_HIDDEN
  73 const char *bytecode_symbol_iterator_get_name(
  74                 struct bytecode_symbol_iterator *it)
  75 {
  76         const char *ret = NULL;
  77
  78         if (!it) {
  79                 goto end;
  80         }
  81
  82         ret = it->bytecode + it->offset + sizeof(uint16_t);
  83 end:
  84         return ret;
  85 }
  86
  87 LTTNG_HIDDEN
  88 void bytecode_symbol_iterator_destroy(struct bytecode_symbol_iterator *it)
  89 {
  90         free(it);
  91 }