types/float.c

   1 /*
   2  * float.c
   3  *
   4  * BabelTrace - Float 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  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  21  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  23  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  24  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  25  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  26  * SOFTWARE.
  27  */
  28
  29 #include <babeltrace/compiler.h>
  30 #include <babeltrace/format.h>
  31 #include <babeltrace/types.h>
  32 #include <babeltrace/endian.h>
  33
  34 static
  35 struct definition *_float_definition_new(struct declaration *declaration,
  36                                    struct definition_scope *parent_scope,
  37                                    GQuark field_name, int index,
  38                                    const char *root_name);
  39 static
  40 void _float_definition_free(struct definition *definition);
  41
  42 static
  43 void _float_declaration_free(struct declaration *declaration)
  44 {
  45         struct declaration_float *float_declaration =
  46                 container_of(declaration, struct declaration_float, p);
  47
  48         bt_declaration_unref(&float_declaration->exp->p);
  49         bt_declaration_unref(&float_declaration->mantissa->p);
  50         bt_declaration_unref(&float_declaration->sign->p);
  51         g_free(float_declaration);
  52 }
  53
  54 struct declaration_float *
  55         bt_float_declaration_new(size_t mantissa_len,
  56                        size_t exp_len, int byte_order, size_t alignment)
  57 {
  58         struct declaration_float *float_declaration;
  59         struct declaration *declaration;
  60
  61         float_declaration = g_new(struct declaration_float, 1);
  62         declaration = &float_declaration->p;
  63         declaration->id = CTF_TYPE_FLOAT;
  64         declaration->alignment = alignment;
  65         declaration->declaration_free = _float_declaration_free;
  66         declaration->definition_new = _float_definition_new;
  67         declaration->definition_free = _float_definition_free;
  68         declaration->ref = 1;
  69         float_declaration->byte_order = byte_order;
  70
  71         float_declaration->sign = bt_integer_declaration_new(1,
  72                                                 byte_order, false, 1, 2,
  73                                                 CTF_STRING_NONE, NULL);
  74         float_declaration->mantissa = bt_integer_declaration_new(mantissa_len - 1,
  75                                                 byte_order, false, 1, 10,
  76                                                 CTF_STRING_NONE, NULL);
  77         float_declaration->exp = bt_integer_declaration_new(exp_len,
  78                                                 byte_order, true, 1, 10,
  79                                                 CTF_STRING_NONE, NULL);
  80         return float_declaration;
  81 }
  82
  83 static
  84 struct definition *
  85         _float_definition_new(struct declaration *declaration,
  86                               struct definition_scope *parent_scope,
  87                               GQuark field_name, int index,
  88                               const char *root_name)
  89 {
  90         struct declaration_float *float_declaration =
  91                 container_of(declaration, struct declaration_float, p);
  92         struct definition_float *_float;
  93         struct definition *tmp;
  94
  95         _float = g_new(struct definition_float, 1);
  96         bt_declaration_ref(&float_declaration->p);
  97         _float->p.declaration = declaration;
  98         _float->declaration = float_declaration;
  99         _float->p.scope = new_definition_scope(parent_scope, field_name, root_name);
 100         _float->p.path = new_definition_path(parent_scope, field_name, root_name);
 101         if (float_declaration->byte_order == LITTLE_ENDIAN) {
 102                 tmp = float_declaration->mantissa->p.definition_new(&float_declaration->mantissa->p,
 103                         _float->p.scope, g_quark_from_static_string("mantissa"), 0, NULL);
 104                 _float->mantissa = container_of(tmp, struct definition_integer, p);
 105                 tmp = float_declaration->exp->p.definition_new(&float_declaration->exp->p,
 106                         _float->p.scope, g_quark_from_static_string("exp"), 1, NULL);
 107                 _float->exp = container_of(tmp, struct definition_integer, p);
 108                 tmp = float_declaration->sign->p.definition_new(&float_declaration->sign->p,
 109                         _float->p.scope, g_quark_from_static_string("sign"), 2, NULL);
 110                 _float->sign = container_of(tmp, struct definition_integer, p);
 111         } else {
 112                 tmp = float_declaration->sign->p.definition_new(&float_declaration->sign->p,
 113                         _float->p.scope, g_quark_from_static_string("sign"), 0, NULL);
 114                 _float->sign = container_of(tmp, struct definition_integer, p);
 115                 tmp = float_declaration->exp->p.definition_new(&float_declaration->exp->p,
 116                         _float->p.scope, g_quark_from_static_string("exp"), 1, NULL);
 117                 _float->exp = container_of(tmp, struct definition_integer, p);
 118                 tmp = float_declaration->mantissa->p.definition_new(&float_declaration->mantissa->p,
 119                         _float->p.scope, g_quark_from_static_string("mantissa"), 2, NULL);
 120                 _float->mantissa = container_of(tmp, struct definition_integer, p);
 121         }
 122         _float->p.ref = 1;
 123         /*
 124          * Use INT_MAX order to ensure that all fields of the parent
 125          * scope are seen as being prior to this scope.
 126          */
 127         _float->p.index = root_name ? INT_MAX : index;
 128         _float->p.name = field_name;
 129         _float->value = 0.0;
 130         if (parent_scope) {
 131                 int ret;
 132
 133                 ret = register_field_definition(field_name, &_float->p,
 134                                                 parent_scope);
 135                 assert(!ret);
 136         }
 137         return &_float->p;
 138 }
 139
 140 static
 141 void _float_definition_free(struct definition *definition)
 142 {
 143         struct definition_float *_float =
 144                 container_of(definition, struct definition_float, p);
 145
 146         bt_definition_unref(&_float->sign->p);
 147         bt_definition_unref(&_float->exp->p);
 148         bt_definition_unref(&_float->mantissa->p);
 149         free_definition_scope(_float->p.scope);
 150         bt_declaration_unref(_float->p.declaration);
 151         g_free(_float);
 152 }