| 1 | /* |
| 2 | * sequence.c |
| 3 | * |
| 4 | * BabelTrace - Sequence Type Converter |
| 5 | * |
| 6 | * Copyright 2010-2011 EfficiOS Inc. and Linux Foundation |
| 7 | * |
| 8 | * Author: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 9 | * |
| 10 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 11 | * of this software and associated documentation files (the "Software"), to deal |
| 12 | * in the Software without restriction, including without limitation the rights |
| 13 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 14 | * copies of the Software, and to permit persons to whom the Software is |
| 15 | * furnished to do so, subject to the following conditions: |
| 16 | * |
| 17 | * The above copyright notice and this permission notice shall be included in |
| 18 | * all copies or substantial portions of the Software. |
| 19 | */ |
| 20 | |
| 21 | #include <babeltrace/compiler.h> |
| 22 | #include <babeltrace/format.h> |
| 23 | #include <inttypes.h> |
| 24 | |
| 25 | static |
| 26 | struct definition *_sequence_definition_new(struct declaration *declaration, |
| 27 | struct definition_scope *parent_scope, |
| 28 | GQuark field_name, int index, |
| 29 | const char *root_name); |
| 30 | static |
| 31 | void _sequence_definition_free(struct definition *definition); |
| 32 | |
| 33 | int sequence_rw(struct stream_pos *pos, struct definition *definition) |
| 34 | { |
| 35 | struct definition_sequence *sequence_definition = |
| 36 | container_of(definition, struct definition_sequence, p); |
| 37 | const struct declaration_sequence *sequence_declaration = |
| 38 | sequence_definition->declaration; |
| 39 | uint64_t len, oldlen, i; |
| 40 | int ret; |
| 41 | |
| 42 | len = sequence_definition->length->value._unsigned; |
| 43 | /* |
| 44 | * Yes, large sequences could be _painfully slow_ to parse due |
| 45 | * to memory allocation for each event read. At least, never |
| 46 | * shrink the sequence. Note: the sequence GArray len should |
| 47 | * never be used as indicator of the current sequence length. |
| 48 | * One should always look at the sequence->len->value._unsigned |
| 49 | * value for that. |
| 50 | */ |
| 51 | oldlen = sequence_definition->elems->len; |
| 52 | if (oldlen < len) |
| 53 | g_ptr_array_set_size(sequence_definition->elems, len); |
| 54 | |
| 55 | for (i = oldlen; i < len; i++) { |
| 56 | struct definition **field; |
| 57 | GString *str; |
| 58 | GQuark name; |
| 59 | |
| 60 | str = g_string_new(""); |
| 61 | g_string_printf(str, "[%" PRIu64 "]", i); |
| 62 | name = g_quark_from_string(str->str); |
| 63 | (void) g_string_free(str, TRUE); |
| 64 | |
| 65 | field = (struct definition **) &g_ptr_array_index(sequence_definition->elems, i); |
| 66 | *field = sequence_declaration->elem->definition_new(sequence_declaration->elem, |
| 67 | sequence_definition->p.scope, |
| 68 | name, i, NULL); |
| 69 | } |
| 70 | for (i = 0; i < len; i++) { |
| 71 | struct definition **field; |
| 72 | |
| 73 | field = (struct definition **) &g_ptr_array_index(sequence_definition->elems, i); |
| 74 | ret = generic_rw(pos, *field); |
| 75 | if (ret) |
| 76 | return ret; |
| 77 | } |
| 78 | return 0; |
| 79 | } |
| 80 | |
| 81 | static |
| 82 | void _sequence_declaration_free(struct declaration *declaration) |
| 83 | { |
| 84 | struct declaration_sequence *sequence_declaration = |
| 85 | container_of(declaration, struct declaration_sequence, p); |
| 86 | |
| 87 | free_declaration_scope(sequence_declaration->scope); |
| 88 | g_array_free(sequence_declaration->length_name, TRUE); |
| 89 | declaration_unref(sequence_declaration->elem); |
| 90 | g_free(sequence_declaration); |
| 91 | } |
| 92 | |
| 93 | struct declaration_sequence * |
| 94 | sequence_declaration_new(const char *length, |
| 95 | struct declaration *elem_declaration, |
| 96 | struct declaration_scope *parent_scope) |
| 97 | { |
| 98 | struct declaration_sequence *sequence_declaration; |
| 99 | struct declaration *declaration; |
| 100 | |
| 101 | sequence_declaration = g_new(struct declaration_sequence, 1); |
| 102 | declaration = &sequence_declaration->p; |
| 103 | |
| 104 | sequence_declaration->length_name = g_array_new(FALSE, TRUE, sizeof(GQuark)); |
| 105 | append_scope_path(length, sequence_declaration->length_name); |
| 106 | |
| 107 | declaration_ref(elem_declaration); |
| 108 | sequence_declaration->elem = elem_declaration; |
| 109 | sequence_declaration->scope = new_declaration_scope(parent_scope); |
| 110 | declaration->id = CTF_TYPE_SEQUENCE; |
| 111 | declaration->alignment = elem_declaration->alignment; |
| 112 | declaration->declaration_free = _sequence_declaration_free; |
| 113 | declaration->definition_new = _sequence_definition_new; |
| 114 | declaration->definition_free = _sequence_definition_free; |
| 115 | declaration->ref = 1; |
| 116 | return sequence_declaration; |
| 117 | } |
| 118 | |
| 119 | static |
| 120 | struct definition *_sequence_definition_new(struct declaration *declaration, |
| 121 | struct definition_scope *parent_scope, |
| 122 | GQuark field_name, int index, |
| 123 | const char *root_name) |
| 124 | { |
| 125 | struct declaration_sequence *sequence_declaration = |
| 126 | container_of(declaration, struct declaration_sequence, p); |
| 127 | struct definition_sequence *sequence; |
| 128 | struct definition *len_parent; |
| 129 | int ret; |
| 130 | |
| 131 | sequence = g_new(struct definition_sequence, 1); |
| 132 | declaration_ref(&sequence_declaration->p); |
| 133 | sequence->p.declaration = declaration; |
| 134 | sequence->declaration = sequence_declaration; |
| 135 | sequence->p.ref = 1; |
| 136 | /* |
| 137 | * Use INT_MAX order to ensure that all fields of the parent |
| 138 | * scope are seen as being prior to this scope. |
| 139 | */ |
| 140 | sequence->p.index = root_name ? INT_MAX : index; |
| 141 | sequence->p.name = field_name; |
| 142 | sequence->p.path = new_definition_path(parent_scope, field_name, root_name); |
| 143 | sequence->p.scope = new_definition_scope(parent_scope, field_name, root_name); |
| 144 | ret = register_field_definition(field_name, &sequence->p, |
| 145 | parent_scope); |
| 146 | assert(!ret); |
| 147 | len_parent = lookup_path_definition(sequence->p.scope->scope_path, |
| 148 | sequence_declaration->length_name, |
| 149 | parent_scope); |
| 150 | if (!len_parent) { |
| 151 | printf("[error] Lookup for sequence length field failed.\n"); |
| 152 | goto error; |
| 153 | } |
| 154 | sequence->length = |
| 155 | container_of(len_parent, struct definition_integer, p); |
| 156 | if (sequence->length->declaration->signedness) { |
| 157 | printf("[error] Sequence length field should be unsigned.\n"); |
| 158 | goto error; |
| 159 | } |
| 160 | definition_ref(len_parent); |
| 161 | |
| 162 | sequence->string = NULL; |
| 163 | sequence->elems = NULL; |
| 164 | |
| 165 | if (sequence_declaration->elem->id == CTF_TYPE_INTEGER) { |
| 166 | struct declaration_integer *integer_declaration = |
| 167 | container_of(sequence_declaration->elem, struct declaration_integer, p); |
| 168 | |
| 169 | if (integer_declaration->encoding == CTF_STRING_UTF8 |
| 170 | || integer_declaration->encoding == CTF_STRING_ASCII) { |
| 171 | |
| 172 | sequence->string = g_string_new(""); |
| 173 | |
| 174 | if (integer_declaration->len == CHAR_BIT |
| 175 | && integer_declaration->p.alignment == CHAR_BIT) { |
| 176 | return &sequence->p; |
| 177 | } |
| 178 | } |
| 179 | } |
| 180 | |
| 181 | sequence->elems = g_ptr_array_new(); |
| 182 | return &sequence->p; |
| 183 | |
| 184 | error: |
| 185 | free_definition_scope(sequence->p.scope); |
| 186 | declaration_unref(&sequence_declaration->p); |
| 187 | g_free(sequence); |
| 188 | return NULL; |
| 189 | } |
| 190 | |
| 191 | static |
| 192 | void _sequence_definition_free(struct definition *definition) |
| 193 | { |
| 194 | struct definition_sequence *sequence = |
| 195 | container_of(definition, struct definition_sequence, p); |
| 196 | struct definition *len_definition = &sequence->length->p; |
| 197 | uint64_t i; |
| 198 | |
| 199 | if (sequence->string) |
| 200 | (void) g_string_free(sequence->string, TRUE); |
| 201 | if (sequence->elems) { |
| 202 | for (i = 0; i < sequence->elems->len; i++) { |
| 203 | struct definition *field; |
| 204 | |
| 205 | field = g_ptr_array_index(sequence->elems, i); |
| 206 | field->declaration->definition_free(field); |
| 207 | } |
| 208 | } |
| 209 | (void) g_ptr_array_free(sequence->elems, TRUE); |
| 210 | definition_unref(len_definition); |
| 211 | free_definition_scope(sequence->p.scope); |
| 212 | declaration_unref(sequence->p.declaration); |
| 213 | g_free(sequence); |
| 214 | } |
| 215 | |
| 216 | uint64_t sequence_len(struct definition_sequence *sequence) |
| 217 | { |
| 218 | return sequence->length->value._unsigned; |
| 219 | } |
| 220 | |
| 221 | struct definition *sequence_index(struct definition_sequence *sequence, uint64_t i) |
| 222 | { |
| 223 | if (!sequence->elems) |
| 224 | return NULL; |
| 225 | if (i >= sequence->length->value._unsigned) |
| 226 | return NULL; |
| 227 | assert(i < sequence->elems->len); |
| 228 | return g_ptr_array_index(sequence->elems, i); |
| 229 | } |