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 #include <endian.h>
  22
  23 static
  24 struct definition *_float_definition_new(struct declaration *declaration,
  25                                    struct definition_scope *parent_scope,
  26                                    GQuark field_name, int index);
  27 static
  28 void _float_definition_free(struct definition *definition);
  29
  30 static
  31 void _float_declaration_free(struct declaration *declaration)
  32 {
  33         struct declaration_float *float_declaration =
  34                 container_of(declaration, struct declaration_float, p);
  35
  36         declaration_unref(&float_declaration->exp->p);
  37         declaration_unref(&float_declaration->mantissa->p);
  38         declaration_unref(&float_declaration->sign->p);
  39         g_free(float_declaration);
  40 }
  41
  42 struct declaration_float *
  43         float_declaration_new(size_t mantissa_len,
  44                        size_t exp_len, int byte_order, size_t alignment)
  45 {
  46         struct declaration_float *float_declaration;
  47         struct declaration *declaration;
  48
  49         float_declaration = g_new(struct declaration_float, 1);
  50         declaration = &float_declaration->p;
  51         declaration->id = CTF_TYPE_FLOAT;
  52         declaration->alignment = alignment;
  53         declaration->declaration_free = _float_declaration_free;
  54         declaration->definition_new = _float_definition_new;
  55         declaration->definition_free = _float_definition_free;
  56         declaration->ref = 1;
  57         float_declaration->byte_order = byte_order;
  58
  59         float_declaration->sign = integer_declaration_new(1,
  60                                             byte_order, false, 1);
  61         float_declaration->mantissa = integer_declaration_new(mantissa_len - 1,
  62                                                 byte_order, false, 1);
  63         float_declaration->exp = integer_declaration_new(exp_len,
  64                                            byte_order, true, 1);
  65         return float_declaration;
  66 }
  67
  68 static
  69 struct definition *
  70         _float_definition_new(struct declaration *declaration,
  71                               struct definition_scope *parent_scope,
  72                               GQuark field_name, int index)
  73 {
  74         struct declaration_float *float_declaration =
  75                 container_of(declaration, struct declaration_float, p);
  76         struct definition_float *_float;
  77         struct definition *tmp;
  78
  79         _float = g_new(struct definition_float, 1);
  80         declaration_ref(&float_declaration->p);
  81         _float->p.declaration = declaration;
  82         _float->declaration = float_declaration;
  83         if (float_declaration->byte_order == LITTLE_ENDIAN) {
  84                 tmp = float_declaration->mantissa->p.definition_new(&float_declaration->mantissa->p,
  85                         parent_scope, g_quark_from_static_string("mantissa"), 0);
  86                 _float->mantissa = container_of(tmp, struct definition_integer, p);
  87                 tmp = float_declaration->exp->p.definition_new(&float_declaration->exp->p,
  88                         parent_scope, g_quark_from_static_string("exp"), 1);
  89                 _float->exp = container_of(tmp, struct definition_integer, p);
  90                 tmp = float_declaration->sign->p.definition_new(&float_declaration->sign->p,
  91                         parent_scope, g_quark_from_static_string("sign"), 2);
  92                 _float->sign = container_of(tmp, struct definition_integer, p);
  93         } else {
  94                 tmp = float_declaration->sign->p.definition_new(&float_declaration->sign->p,
  95                         parent_scope, g_quark_from_static_string("sign"), 0);
  96                 _float->sign = container_of(tmp, struct definition_integer, p);
  97                 tmp = float_declaration->exp->p.definition_new(&float_declaration->exp->p,
  98                         parent_scope, g_quark_from_static_string("exp"), 1);
  99                 _float->exp = container_of(tmp, struct definition_integer, p);
 100                 tmp = float_declaration->mantissa->p.definition_new(&float_declaration->mantissa->p,
 101                         parent_scope, g_quark_from_static_string("mantissa"), 2);
 102                 _float->mantissa = container_of(tmp, struct definition_integer, p);
 103         }
 104         _float->p.ref = 1;
 105         _float->p.index = index;
 106         _float->value = 0.0;
 107         return &_float->p;
 108 }
 109
 110 static
 111 void _float_definition_free(struct definition *definition)
 112 {
 113         struct definition_float *_float =
 114                 container_of(definition, struct definition_float, p);
 115
 116         definition_unref(&_float->sign->p);
 117         definition_unref(&_float->exp->p);
 118         definition_unref(&_float->mantissa->p);
 119         declaration_unref(_float->p.declaration);
 120         g_free(_float);
 121 }