Unref: handle null pointers
[babeltrace.git] / types / struct.c
CommitLineData
11796b96 1/*
ccd7e1c8 2 * struct.c
11796b96 3 *
ccd7e1c8 4 * BabelTrace - Structure Type Converter
11796b96 5 *
c054553d 6 * Copyright 2010, 2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
11796b96 7 *
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8 * Permission is hereby granted, free of charge, to any person obtaining a copy
9 * of this software and associated documentation files (the "Software"), to deal
10 * in the Software without restriction, including without limitation the rights
11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
12 * copies of the Software, and to permit persons to whom the Software is
13 * furnished to do so, subject to the following conditions:
11796b96 14 *
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15 * The above copyright notice and this permission notice shall be included in
16 * all copies or substantial portions of the Software.
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17 */
18
19#include <babeltrace/compiler.h>
4c8bfb7e 20#include <babeltrace/format.h>
11796b96 21
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22#ifndef max
23#define max(a, b) ((a) < (b) ? (b) : (a))
24#endif
25
c054553d 26static
f6625916 27struct definition *_struct_definition_new(struct declaration *declaration,
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28 struct definition_scope *parent_scope,
29 GQuark field_name, int index);
c054553d 30static
e1151715 31void _struct_definition_free(struct definition *definition);
c054553d 32
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33void struct_copy(struct stream_pos *dest, const struct format *fdest,
34 struct stream_pos *src, const struct format *fsrc,
e1151715 35 struct definition *definition)
11796b96 36{
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37 struct definition_struct *_struct =
38 container_of(definition, struct definition_struct, p);
f6625916 39 struct declaration_struct *struct_declaration = _struct->declaration;
c054553d 40 unsigned long i;
11796b96 41
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42 fsrc->struct_begin(src, struct_declaration);
43 fdest->struct_begin(dest, struct_declaration);
11796b96 44
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45 for (i = 0; i < _struct->fields->len; i++) {
46 struct field *field = &g_array_index(_struct->fields,
11796b96 47 struct field, i);
f6625916 48 struct declaration *field_declaration = field->definition->declaration;
11796b96 49
f6625916 50 field_declaration->copy(dest, fdest, src, fsrc, field->definition);
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51
52 }
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53 fsrc->struct_end(src, struct_declaration);
54 fdest->struct_end(dest, struct_declaration);
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55}
56
c054553d 57static
f6625916 58void _struct_declaration_free(struct declaration *declaration)
11796b96 59{
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60 struct declaration_struct *struct_declaration =
61 container_of(declaration, struct declaration_struct, p);
c054553d 62 unsigned long i;
4c8bfb7e 63
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64 free_declaration_scope(struct_declaration->scope);
65 g_hash_table_destroy(struct_declaration->fields_by_name);
4c8bfb7e 66
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67 for (i = 0; i < struct_declaration->fields->len; i++) {
68 struct declaration_field *declaration_field =
69 &g_array_index(struct_declaration->fields,
70 struct declaration_field, i);
71 declaration_unref(declaration_field->declaration);
4c8bfb7e 72 }
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73 g_array_free(struct_declaration->fields, true);
74 g_free(struct_declaration);
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75}
76
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77struct declaration_struct *
78 struct_declaration_new(struct declaration_scope *parent_scope)
11796b96 79{
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80 struct declaration_struct *struct_declaration;
81 struct declaration *declaration;
11796b96 82
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83 struct_declaration = g_new(struct declaration_struct, 1);
84 declaration = &struct_declaration->p;
85 struct_declaration->fields_by_name = g_hash_table_new(g_direct_hash,
e19c3d69 86 g_direct_equal);
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87 struct_declaration->fields = g_array_sized_new(FALSE, TRUE,
88 sizeof(struct declaration_field),
e19c3d69 89 DEFAULT_NR_STRUCT_FIELDS);
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90 struct_declaration->scope = new_declaration_scope(parent_scope);
91 declaration->id = CTF_TYPE_STRUCT;
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92 declaration->alignment = 1;
93 declaration->copy = struct_copy;
94 declaration->declaration_free = _struct_declaration_free;
95 declaration->definition_new = _struct_definition_new;
96 declaration->definition_free = _struct_definition_free;
97 declaration->ref = 1;
98 return struct_declaration;
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99}
100
c054553d 101static
e1151715 102struct definition *
f6625916 103 _struct_definition_new(struct declaration *declaration,
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104 struct definition_scope *parent_scope,
105 GQuark field_name, int index)
11796b96 106{
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107 struct declaration_struct *struct_declaration =
108 container_of(declaration, struct declaration_struct, p);
e1151715 109 struct definition_struct *_struct;
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110 unsigned long i;
111 int ret;
c054553d 112
e1151715 113 _struct = g_new(struct definition_struct, 1);
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114 declaration_ref(&struct_declaration->p);
115 _struct->p.declaration = declaration;
116 _struct->declaration = struct_declaration;
c054553d 117 _struct->p.ref = 1;
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118 _struct->p.index = index;
119 _struct->scope = new_definition_scope(parent_scope, field_name);
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120 _struct->fields = g_array_sized_new(FALSE, TRUE,
121 sizeof(struct field),
122 DEFAULT_NR_STRUCT_FIELDS);
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123 g_array_set_size(_struct->fields, struct_declaration->fields->len);
124 for (i = 0; i < struct_declaration->fields->len; i++) {
125 struct declaration_field *declaration_field =
126 &g_array_index(struct_declaration->fields,
127 struct declaration_field, i);
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128 struct field *field = &g_array_index(_struct->fields,
129 struct field, i);
130
f6625916 131 field->name = declaration_field->name;
e1151715 132 field->definition =
f6625916 133 declaration_field->declaration->definition_new(declaration_field->declaration,
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134 _struct->scope,
135 field->name, i);
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136 ret = register_field_definition(field->name,
137 field->definition,
138 _struct->scope);
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139 assert(!ret);
140 }
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141 return &_struct->p;
142}
143
144static
e1151715 145void _struct_definition_free(struct definition *definition)
c054553d 146{
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147 struct definition_struct *_struct =
148 container_of(definition, struct definition_struct, p);
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149 unsigned long i;
150
f6625916 151 assert(_struct->fields->len == _struct->declaration->fields->len);
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152 for (i = 0; i < _struct->fields->len; i++) {
153 struct field *field = &g_array_index(_struct->fields,
154 struct field, i);
e1151715 155 definition_unref(field->definition);
c054553d 156 }
e1151715 157 free_definition_scope(_struct->scope);
f6625916 158 declaration_unref(_struct->p.declaration);
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159 g_free(_struct);
160}
161
f6625916 162void struct_declaration_add_field(struct declaration_struct *struct_declaration,
e19c3d69 163 const char *field_name,
f6625916 164 struct declaration *field_declaration)
c054553d 165{
f6625916 166 struct declaration_field *field;
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167 unsigned long index;
168
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169 g_array_set_size(struct_declaration->fields, struct_declaration->fields->len + 1);
170 index = struct_declaration->fields->len - 1; /* last field (new) */
171 field = &g_array_index(struct_declaration->fields, struct declaration_field, index);
11796b96 172 field->name = g_quark_from_string(field_name);
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173 declaration_ref(field_declaration);
174 field->declaration = field_declaration;
11796b96 175 /* Keep index in hash rather than pointer, because array can relocate */
f6625916 176 g_hash_table_insert(struct_declaration->fields_by_name,
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177 (gpointer) (unsigned long) field->name,
178 (gpointer) index);
179 /*
f6625916 180 * Alignment of structure is the max alignment of declarations contained
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181 * therein.
182 */
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183 struct_declaration->p.alignment = max(struct_declaration->p.alignment,
184 field_declaration->alignment);
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185}
186
187unsigned long
f6625916 188 struct_declaration_lookup_field_index(struct declaration_struct *struct_declaration,
e19c3d69 189 GQuark field_name)
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190{
191 unsigned long index;
192
f6625916 193 index = (unsigned long) g_hash_table_lookup(struct_declaration->fields_by_name,
4c8bfb7e 194 (gconstpointer) (unsigned long) field_name);
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195 return index;
196}
197
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198/*
199 * field returned only valid as long as the field structure is not appended to.
200 */
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201struct declaration_field *
202 struct_declaration_get_field_from_index(struct declaration_struct *struct_declaration,
e19c3d69 203 unsigned long index)
c054553d 204{
f6625916 205 return &g_array_index(struct_declaration->fields, struct declaration_field, index);
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206}
207
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208/*
209 * field returned only valid as long as the field structure is not appended to.
210 */
211struct field *
e1151715 212struct_definition_get_field_from_index(struct definition_struct *_struct,
e19c3d69 213 unsigned long index)
11796b96 214{
e19c3d69 215 return &g_array_index(_struct->fields, struct field, index);
11796b96 216}
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