| 1 | /* |
| 2 | * struct.c |
| 3 | * |
| 4 | * BabelTrace - Structure Type Converter |
| 5 | * |
| 6 | * Copyright 2010 - 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 | void struct_copy(struct stream_pos *dest, const struct format *fdest, |
| 27 | struct stream_pos *src, const struct format *fsrc, |
| 28 | const struct type_class *type_class) |
| 29 | { |
| 30 | struct type_class_struct *struct_class = |
| 31 | container_of(type_class, struct type_class_struct, p); |
| 32 | unsigned int i; |
| 33 | |
| 34 | fsrc->struct_begin(src, struct_class); |
| 35 | fdest->struct_begin(dest, struct_class); |
| 36 | |
| 37 | for (i = 0; i < struct_class->fields->len; i++) { |
| 38 | struct field *field = &g_array_index(struct_class->fields, |
| 39 | struct field, i); |
| 40 | struct type_class *field_class = field->type_class; |
| 41 | |
| 42 | field_class->copy(dest, fdest, src, fsrc, field_class); |
| 43 | |
| 44 | } |
| 45 | fsrc->struct_end(src, struct_class); |
| 46 | fdest->struct_end(dest, struct_class); |
| 47 | } |
| 48 | |
| 49 | void struct_type_free(struct type_class_struct *struct_class) |
| 50 | { |
| 51 | unsigned int i; |
| 52 | |
| 53 | g_hash_table_destroy(struct_class->fields_by_name); |
| 54 | |
| 55 | for (i = 0; i < struct_class->fields->len; i++) { |
| 56 | struct field *field = &g_array_index(struct_class->fields, |
| 57 | struct field, i); |
| 58 | type_unref(field->type_class); |
| 59 | } |
| 60 | g_array_free(struct_class->fields, true); |
| 61 | g_free(struct_class); |
| 62 | } |
| 63 | |
| 64 | static void _struct_type_free(struct type_class *type_class) |
| 65 | { |
| 66 | struct type_class_struct *struct_class = |
| 67 | container_of(type_class, struct type_class_struct, p); |
| 68 | struct_type_free(struct_class); |
| 69 | } |
| 70 | |
| 71 | struct type_class_struct *struct_type_new(const char *name) |
| 72 | { |
| 73 | struct type_class_struct *struct_class; |
| 74 | struct type_class *type_class; |
| 75 | int ret; |
| 76 | |
| 77 | struct_class = g_new(struct type_class_struct, 1); |
| 78 | type_class = &struct_class->p; |
| 79 | |
| 80 | struct_class->fields_by_name = g_hash_table_new(g_direct_hash, |
| 81 | g_direct_equal); |
| 82 | struct_class->fields = g_array_sized_new(false, false, |
| 83 | sizeof(struct field), |
| 84 | DEFAULT_NR_STRUCT_FIELDS); |
| 85 | type_class->name = g_quark_from_string(name); |
| 86 | type_class->alignment = 1; |
| 87 | type_class->copy = struct_copy; |
| 88 | type_class->free = _struct_type_free; |
| 89 | type_class->ref = 1; |
| 90 | |
| 91 | if (type_class->name) { |
| 92 | ret = register_type(type_class); |
| 93 | if (ret) |
| 94 | goto error_register; |
| 95 | } |
| 96 | return struct_class; |
| 97 | |
| 98 | error_register: |
| 99 | g_free(struct_class); |
| 100 | return NULL; |
| 101 | } |
| 102 | |
| 103 | void struct_type_add_field(struct type_class_struct *struct_class, |
| 104 | const char *field_name, |
| 105 | struct type_class *type_class) |
| 106 | { |
| 107 | struct field *field; |
| 108 | unsigned long index; |
| 109 | |
| 110 | g_array_set_size(struct_class->fields, struct_class->fields->len + 1); |
| 111 | index = struct_class->fields->len - 1; /* last field (new) */ |
| 112 | field = &g_array_index(struct_class->fields, struct field, index); |
| 113 | field->name = g_quark_from_string(field_name); |
| 114 | type_ref(type_class); |
| 115 | field->type_class = type_class; |
| 116 | /* Keep index in hash rather than pointer, because array can relocate */ |
| 117 | g_hash_table_insert(struct_class->fields_by_name, |
| 118 | (gpointer) (unsigned long) field->name, |
| 119 | (gpointer) index); |
| 120 | /* |
| 121 | * Alignment of structure is the max alignment of types contained |
| 122 | * therein. |
| 123 | */ |
| 124 | struct_class->p.alignment = max(struct_class->p.alignment, |
| 125 | type_class->alignment); |
| 126 | } |
| 127 | |
| 128 | unsigned long |
| 129 | struct_type_lookup_field_index(struct type_class_struct *struct_class, |
| 130 | GQuark field_name) |
| 131 | { |
| 132 | unsigned long index; |
| 133 | |
| 134 | index = (unsigned long) g_hash_table_lookup(struct_class->fields_by_name, |
| 135 | (gconstpointer) (unsigned long) field_name); |
| 136 | return index; |
| 137 | } |
| 138 | |
| 139 | /* |
| 140 | * field returned only valid as long as the field structure is not appended to. |
| 141 | */ |
| 142 | struct field * |
| 143 | struct_type_get_field_from_index(struct type_class_struct *struct_class, |
| 144 | unsigned long index) |
| 145 | { |
| 146 | return &g_array_index(struct_class->fields, struct field, index); |
| 147 | } |