types/float.c

   1 /*
   2  * float.c
   3  *
   4  * BabelTrace - Float 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 static
  23 struct definition *_float_definition_new(struct declaration *declaration,
  24                                    struct definition_scope *parent_scope,
  25                                    GQuark field_name, int index);
  26 static
  27 void _float_definition_free(struct definition *definition);
  28
  29 static
  30 void _float_declaration_free(struct declaration *declaration)
  31 {
  32         struct declaration_float *float_declaration =
  33                 container_of(declaration, struct declaration_float, p);
  34
  35         declaration_unref(&float_declaration->exp->p);
  36         declaration_unref(&float_declaration->mantissa->p);
  37         declaration_unref(&float_declaration->sign->p);
  38         g_free(float_declaration);
  39 }
  40
  41 struct declaration_float *
  42         float_declaration_new(size_t mantissa_len,
  43                        size_t exp_len, int byte_order, size_t alignment)
  44 {
  45         struct declaration_float *float_declaration;
  46         struct declaration *declaration;
  47
  48         float_declaration = g_new(struct declaration_float, 1);
  49         declaration = &float_declaration->p;
  50         declaration->id = CTF_TYPE_FLOAT;
  51         declaration->alignment = alignment;
  52         declaration->declaration_free = _float_declaration_free;
  53         declaration->definition_new = _float_definition_new;
  54         declaration->definition_free = _float_definition_free;
  55         declaration->ref = 1;
  56         float_declaration->byte_order = byte_order;
  57
  58         float_declaration->sign = integer_declaration_new(1,
  59                                             byte_order, false, 1);
  60         float_declaration->mantissa = integer_declaration_new(mantissa_len - 1,
  61                                                 byte_order, false, 1);
  62         float_declaration->exp = integer_declaration_new(exp_len,
  63                                            byte_order, true, 1);
  64         return float_declaration;
  65 }
  66
  67 static
  68 struct definition *
  69         _float_definition_new(struct declaration *declaration,
  70                               struct definition_scope *parent_scope,
  71                               GQuark field_name, int index)
  72 {
  73         struct declaration_float *float_declaration =
  74                 container_of(declaration, struct declaration_float, p);
  75         struct definition_float *_float;
  76         struct definition *tmp;
  77
  78         _float = g_new(struct definition_float, 1);
  79         declaration_ref(&float_declaration->p);
  80         _float->p.declaration = declaration;
  81         _float->declaration = float_declaration;
  82         if (float_declaration->byte_order == LITTLE_ENDIAN) {
  83                 tmp = float_declaration->mantissa->p.definition_new(&float_declaration->mantissa->p,
  84                         parent_scope, g_quark_from_static_string("mantissa"), 0);
  85                 _float->mantissa = container_of(tmp, struct definition_integer, p);
  86                 tmp = float_declaration->exp->p.definition_new(&float_declaration->exp->p,
  87                         parent_scope, g_quark_from_static_string("exp"), 1);
  88                 _float->exp = container_of(tmp, struct definition_integer, p);
  89                 tmp = float_declaration->sign->p.definition_new(&float_declaration->sign->p,
  90                         parent_scope, g_quark_from_static_string("sign"), 2);
  91                 _float->sign = container_of(tmp, struct definition_integer, p);
  92         } else {
  93                 tmp = float_declaration->sign->p.definition_new(&float_declaration->sign->p,
  94                         parent_scope, g_quark_from_static_string("sign"), 0);
  95                 _float->sign = container_of(tmp, struct definition_integer, p);
  96                 tmp = float_declaration->exp->p.definition_new(&float_declaration->exp->p,
  97                         parent_scope, g_quark_from_static_string("exp"), 1);
  98                 _float->exp = container_of(tmp, struct definition_integer, p);
  99                 tmp = float_declaration->mantissa->p.definition_new(&float_declaration->mantissa->p,
 100                         parent_scope, g_quark_from_static_string("mantissa"), 2);
 101                 _float->mantissa = container_of(tmp, struct definition_integer, p);
 102         }
 103         _float->p.ref = 1;
 104         _float->p.index = index;
 105         _float->value = 0.0;
 106         return &_float->p;
 107 }
 108
 109 static
 110 void _float_definition_free(struct definition *definition)
 111 {
 112         struct definition_float *_float =
 113                 container_of(definition, struct definition_float, p);
 114
 115         definition_unref(&_float->sign->p);
 116         definition_unref(&_float->exp->p);
 117         definition_unref(&_float->mantissa->p);
 118         declaration_unref(_float->p.declaration);
 119         g_free(_float);
 120 }