| 1 | /* |
| 2 | * struct.c |
| 3 | * |
| 4 | * BabelTrace - Structure Type Converter |
| 5 | * |
| 6 | * Copyright 2010, 2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 7 | * |
| 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: |
| 14 | * |
| 15 | * The above copyright notice and this permission notice shall be included in |
| 16 | * all copies or substantial portions of the Software. |
| 17 | */ |
| 18 | |
| 19 | #include <babeltrace/compiler.h> |
| 20 | #include <babeltrace/format.h> |
| 21 | |
| 22 | #ifndef max |
| 23 | #define max(a, b) ((a) < (b) ? (b) : (a)) |
| 24 | #endif |
| 25 | |
| 26 | static |
| 27 | struct declaration *_struct_declaration_new(struct type *type, |
| 28 | struct declaration_scope *parent_scope); |
| 29 | static |
| 30 | void _struct_declaration_free(struct declaration *declaration); |
| 31 | |
| 32 | void struct_copy(struct stream_pos *dest, const struct format *fdest, |
| 33 | struct stream_pos *src, const struct format *fsrc, |
| 34 | struct declaration *declaration) |
| 35 | { |
| 36 | struct declaration_struct *_struct = |
| 37 | container_of(declaration, struct declaration_struct, p); |
| 38 | struct type_struct *struct_type = _struct->type; |
| 39 | unsigned long i; |
| 40 | |
| 41 | fsrc->struct_begin(src, struct_type); |
| 42 | fdest->struct_begin(dest, struct_type); |
| 43 | |
| 44 | for (i = 0; i < _struct->fields->len; i++) { |
| 45 | struct field *field = &g_array_index(_struct->fields, |
| 46 | struct field, i); |
| 47 | struct type *field_type = field->declaration->type; |
| 48 | |
| 49 | field_type->copy(dest, fdest, src, fsrc, field->declaration); |
| 50 | |
| 51 | } |
| 52 | fsrc->struct_end(src, struct_type); |
| 53 | fdest->struct_end(dest, struct_type); |
| 54 | } |
| 55 | |
| 56 | static |
| 57 | void _struct_type_free(struct type *type) |
| 58 | { |
| 59 | struct type_struct *struct_type = |
| 60 | container_of(type, struct type_struct, p); |
| 61 | unsigned long i; |
| 62 | |
| 63 | free_type_scope(struct_type->scope); |
| 64 | g_hash_table_destroy(struct_type->fields_by_name); |
| 65 | |
| 66 | for (i = 0; i < struct_type->fields->len; i++) { |
| 67 | struct type_field *type_field = |
| 68 | &g_array_index(struct_type->fields, |
| 69 | struct type_field, i); |
| 70 | type_unref(type_field->type); |
| 71 | } |
| 72 | g_array_free(struct_type->fields, true); |
| 73 | g_free(struct_type); |
| 74 | } |
| 75 | |
| 76 | struct type_struct *struct_type_new(const char *name, |
| 77 | struct type_scope *parent_scope) |
| 78 | { |
| 79 | struct type_struct *struct_type; |
| 80 | struct type *type; |
| 81 | |
| 82 | struct_type = g_new(struct type_struct, 1); |
| 83 | type = &struct_type->p; |
| 84 | struct_type->fields_by_name = g_hash_table_new(g_direct_hash, |
| 85 | g_direct_equal); |
| 86 | struct_type->fields = g_array_sized_new(FALSE, TRUE, |
| 87 | sizeof(struct type_field), |
| 88 | DEFAULT_NR_STRUCT_FIELDS); |
| 89 | struct_type->scope = new_type_scope(parent_scope); |
| 90 | type->name = g_quark_from_string(name); |
| 91 | type->alignment = 1; |
| 92 | type->copy = struct_copy; |
| 93 | type->type_free = _struct_type_free; |
| 94 | type->declaration_new = _struct_declaration_new; |
| 95 | type->declaration_free = _struct_declaration_free; |
| 96 | type->ref = 1; |
| 97 | return struct_type; |
| 98 | } |
| 99 | |
| 100 | static |
| 101 | struct declaration * |
| 102 | _struct_declaration_new(struct type *type, |
| 103 | struct declaration_scope *parent_scope) |
| 104 | { |
| 105 | struct type_struct *struct_type = |
| 106 | container_of(type, struct type_struct, p); |
| 107 | struct declaration_struct *_struct; |
| 108 | unsigned long i; |
| 109 | int ret; |
| 110 | |
| 111 | _struct = g_new(struct declaration_struct, 1); |
| 112 | type_ref(&struct_type->p); |
| 113 | _struct->p.type = type; |
| 114 | _struct->type = struct_type; |
| 115 | _struct->p.ref = 1; |
| 116 | _struct->scope = new_declaration_scope(parent_scope); |
| 117 | _struct->fields = g_array_sized_new(FALSE, TRUE, |
| 118 | sizeof(struct field), |
| 119 | DEFAULT_NR_STRUCT_FIELDS); |
| 120 | g_array_set_size(_struct->fields, struct_type->fields->len); |
| 121 | for (i = 0; i < struct_type->fields->len; i++) { |
| 122 | struct type_field *type_field = |
| 123 | &g_array_index(struct_type->fields, |
| 124 | struct type_field, i); |
| 125 | struct field *field = &g_array_index(_struct->fields, |
| 126 | struct field, i); |
| 127 | |
| 128 | field->name = type_field->name; |
| 129 | field->declaration = |
| 130 | type_field->type->declaration_new(type_field->type, |
| 131 | _struct->scope); |
| 132 | ret = register_declaration(field->name, |
| 133 | field->declaration, _struct->scope); |
| 134 | assert(!ret); |
| 135 | } |
| 136 | return &_struct->p; |
| 137 | } |
| 138 | |
| 139 | static |
| 140 | void _struct_declaration_free(struct declaration *declaration) |
| 141 | { |
| 142 | struct declaration_struct *_struct = |
| 143 | container_of(declaration, struct declaration_struct, p); |
| 144 | unsigned long i; |
| 145 | |
| 146 | assert(_struct->fields->len == _struct->type->fields->len); |
| 147 | for (i = 0; i < _struct->fields->len; i++) { |
| 148 | struct field *field = &g_array_index(_struct->fields, |
| 149 | struct field, i); |
| 150 | declaration_unref(field->declaration); |
| 151 | } |
| 152 | free_declaration_scope(_struct->scope); |
| 153 | type_unref(_struct->p.type); |
| 154 | g_free(_struct); |
| 155 | } |
| 156 | |
| 157 | void struct_type_add_field(struct type_struct *struct_type, |
| 158 | const char *field_name, |
| 159 | struct type *field_type) |
| 160 | { |
| 161 | struct type_field *field; |
| 162 | unsigned long index; |
| 163 | |
| 164 | g_array_set_size(struct_type->fields, struct_type->fields->len + 1); |
| 165 | index = struct_type->fields->len - 1; /* last field (new) */ |
| 166 | field = &g_array_index(struct_type->fields, struct type_field, index); |
| 167 | field->name = g_quark_from_string(field_name); |
| 168 | type_ref(field_type); |
| 169 | field->type = field_type; |
| 170 | /* Keep index in hash rather than pointer, because array can relocate */ |
| 171 | g_hash_table_insert(struct_type->fields_by_name, |
| 172 | (gpointer) (unsigned long) field->name, |
| 173 | (gpointer) index); |
| 174 | /* |
| 175 | * Alignment of structure is the max alignment of types contained |
| 176 | * therein. |
| 177 | */ |
| 178 | struct_type->p.alignment = max(struct_type->p.alignment, |
| 179 | field_type->alignment); |
| 180 | } |
| 181 | |
| 182 | unsigned long |
| 183 | struct_type_lookup_field_index(struct type_struct *struct_type, |
| 184 | GQuark field_name) |
| 185 | { |
| 186 | unsigned long index; |
| 187 | |
| 188 | index = (unsigned long) g_hash_table_lookup(struct_type->fields_by_name, |
| 189 | (gconstpointer) (unsigned long) field_name); |
| 190 | return index; |
| 191 | } |
| 192 | |
| 193 | /* |
| 194 | * field returned only valid as long as the field structure is not appended to. |
| 195 | */ |
| 196 | struct type_field * |
| 197 | struct_type_get_field_from_index(struct type_struct *struct_type, |
| 198 | unsigned long index) |
| 199 | { |
| 200 | return &g_array_index(struct_type->fields, struct type_field, index); |
| 201 | } |
| 202 | |
| 203 | /* |
| 204 | * field returned only valid as long as the field structure is not appended to. |
| 205 | */ |
| 206 | struct field * |
| 207 | struct_declaration_get_field_from_index(struct declaration_struct *_struct, |
| 208 | unsigned long index) |
| 209 | { |
| 210 | return &g_array_index(_struct->fields, struct field, index); |
| 211 | } |