types/struct.c

   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/types.h>
  21
  22 void struct_copy(struct stream_pos *dest, const struct format *fdest,
  23                  struct stream_pos *src, const struct format *fsrc,
  24                  const struct type_class *type_class)
  25 {
  26         struct type_class_struct *struct_class =
  27                 container_of(type_class, struct type_class_struct, p);
  28         unsigned int i;
  29
  30         fsrc->struct_begin(src, struct_class);
  31         fdest->struct_begin(dest, struct_class);
  32
  33         for (i = 0; i < struct_class->fields->len; i++) {
  34                 struct field *field = &g_array_index(struct_class->fields,
  35                                                      struct field, i);
  36                 struct type_class *field_class = field->type_class;
  37
  38                 field_class->copy(dest, fdest, src, fsrc, &field_class->p);
  39
  40         }
  41         fsrc->struct_end(src, struct_class);
  42         fdest->struct_end(dest, struct_class);
  43 }
  44
  45 void struct_type_free(struct type_class_struct *struct_class)
  46 {
  47         g_hash_table_destroy(struct_class->fields_by_name);
  48         g_array_free(struct_class->fields, true);
  49         g_free(struct_class);
  50 }
  51
  52 static void _struct_type_free(struct type_class *type_class)
  53 {
  54         struct type_class_struct *struct_class =
  55                 container_of(type_class, struct type_class_struct, p);
  56         struct_type_free(struct_class);
  57 }
  58
  59 struct type_class_struct *struct_type_new(const char *name)
  60 {
  61         struct type_class_struct *struct_class;
  62         int ret;
  63
  64         struct_class = g_new(struct type_class_struct, 1);
  65         type_class = &float_class->p;
  66
  67         struct_class->fields_by_name = g_hash_table_new(g_direct_hash,
  68                                                         g_direct_equal);
  69         struct_class->fields = g_array_sized_new(false, false,
  70                                                  sizeof(struct field),
  71                                                  DEFAULT_NR_STRUCT_FIELDS)
  72         type_class->name = g_quark_from_string(name);
  73         type_class->alignment = 1;
  74         type_class->copy = struct_copy;
  75         type_class->free = _struct_type_free;
  76
  77         if (type_class->name) {
  78                 ret = ctf_register_type(type_class);
  79                 if (ret)
  80                         goto error_register;
  81         }
  82         return struct_class;
  83
  84 error_register:
  85         g_free(struct_class);
  86         return NULL;
  87 }
  88
  89 void struct_type_add_field(struct type_class_struct *struct_class,
  90                            const char *field_name,
  91                            struct type_class *type_class)
  92 {
  93         struct field *field;
  94         unsigned long index;
  95
  96         g_array_set_size(struct_class->fields, struct_class->fields->len + 1);
  97         index = struct_class->fields->len - 1;  /* last field (new) */
  98         field = &g_array_index(struct_class->fields, struct field, index);
  99         field->name = g_quark_from_string(field_name);
 100         field->type_class = type_class;
 101         /* Keep index in hash rather than pointer, because array can relocate */
 102         g_hash_table_insert(struct_class->fields_by_name,
 103                             (gpointer) (unsigned long) field->name,
 104                             (gpointer) index);
 105         /*
 106          * Alignment of structure is the max alignment of types contained
 107          * therein.
 108          */
 109         struct_class->p.alignment = max(struct_class->p.alignment,
 110                                         type_class->alignment);
 111 }
 112
 113 unsigned long
 114 struct_type_lookup_field_index(struct type_class_struct *struct_class,
 115                                GQuark field_name)
 116 {
 117         unsigned long index;
 118
 119         index = (unsigned long) g_hash_table_lookup(struct_class->fields_by_name,
 120                                                     field_name);
 121         return index;
 122 }
 123
 124 /*
 125  * field returned only valid as long as the field structure is not appended to.
 126  */
 127 struct field *
 128 struct_type_get_field_from_index(struct type_class_struct *struct_class,
 129                                  unsigned long index)
 130 {
 131         return &g_array_index(struct_class->fields, struct field, index);
 132 }